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p2p/discv5: added new topic discovery package

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This commit is contained in:
Zsolt Felfoldi 2016-10-19 13:04:55 +02:00 committed by Felix Lange
parent 7db7109a5b
commit 49da42983a
39 changed files with 8096 additions and 49 deletions
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13
cmd/bootnode/main.go
View File

@ -27,6 +27,7 @@ import (
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/nat"
)
@ -38,6 +39,7 @@ func main() {
nodeKeyFile = flag.String("nodekey", "", "private key filename")
nodeKeyHex = flag.String("nodekeyhex", "", "private key as hex (for testing)")
natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
runv5 = flag.Bool("v5", false, "run a v5 topic discovery bootnode")
nodeKey *ecdsa.PrivateKey
err error
@ -79,8 +81,15 @@ func main() {
os.Exit(0)
}
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
if *runv5 {
if _, err := discv5.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
}
} else {
if _, err := discover.ListenUDP(nodeKey, *listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
}
}
select {}
}

29
cmd/geth/main.go
View File

@ -41,7 +41,6 @@ import (
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p/discover"
"gopkg.in/urfave/cli.v1"
)
@ -120,11 +119,9 @@ participating.
utils.OlympicFlag,
utils.FastSyncFlag,
utils.LightModeFlag,
utils.NoDefSrvFlag,
utils.LightServFlag,
utils.LightPeersFlag,
utils.LightKDFFlag,
utils.CacheFlag,
utils.TrieCacheGenFlag,
utils.JSpathFlag,
utils.ListenPortFlag,
@ -141,6 +138,7 @@ participating.
utils.NATFlag,
utils.NatspecEnabledFlag,
utils.NoDiscoverFlag,
utils.DiscoveryV5Flag,
utils.NodeKeyFileFlag,
utils.NodeKeyHexFlag,
utils.RPCEnabledFlag,
@ -285,31 +283,6 @@ func startNode(ctx *cli.Context, stack *node.Node) {
// Start up the node itself
utils.StartNode(stack)
if ctx.GlobalBool(utils.LightModeFlag.Name) && !ctx.GlobalBool(utils.NoDefSrvFlag.Name) {
// add default light server; test phase only
addPeer := func(url string) {
node, err := discover.ParseNode(url)
if err == nil {
stack.Server().AddPeer(node)
}
}
if ctx.GlobalBool(utils.TestNetFlag.Name) {
// TestNet (John Gerryts @phonikg)
addPeer("enode://d72af45ba9b60851a8077a4eb07700484b585e5f2e55024e0c93b7ec7d114f2e3fa3c8f3a3358f89da00a609f5a062415deb857ada863b8cdad02b0b0bc90da3@50.112.52.169:30301")
} else {
if ctx.GlobalBool(utils.OpposeDAOFork.Name) {
// Classic (Azure)
addPeer("enode://fc3d7b57e5d317946bf421411632ec98d5ffcbf94548cd7bc10088e4fef176670f8ec70280d301a9d0b22fe498203f62b323da15b3acc18b02a1fee2a06b7d3f@40.118.3.223:30305")
} else {
// MainNet (Azure)
addPeer("enode://feaf206a308a669a789be45f4dadcb351246051727f12415ad69e44f8080daf0569c10fe1d9944d245dd1f3e1c89cedda8ce03d7e3d5ed8975a35cad4b4f7ec1@40.118.3.223:30303")
// MainNet (John Gerryts @phonikg)
addPeer("enode://02b80f0d47c7c157c069d0584067a284cdf188b9267666234b872e70d936a803ad20ea27f78ef1fd6425ae4b7108907e1875adbca96b038004114ac4d1e529a3@50.112.52.169:30300")
}
}
}
// Unlock any account specifically requested
accman := stack.AccountManager()
passwords := utils.MakePasswordList(ctx)

2
cmd/geth/usage.go
View File

@ -73,7 +73,6 @@ var AppHelpFlagGroups = []flagGroup{
utils.IdentityFlag,
utils.FastSyncFlag,
utils.LightModeFlag,
utils.NoDefSrvFlag,
utils.LightServFlag,
utils.LightPeersFlag,
utils.LightKDFFlag,
@ -123,6 +122,7 @@ var AppHelpFlagGroups = []flagGroup{
utils.MaxPendingPeersFlag,
utils.NATFlag,
utils.NoDiscoverFlag,
utils.DiscoveryV5Flag,
utils.NodeKeyFileFlag,
utils.NodeKeyHexFlag,
},

17
cmd/utils/flags.go
View File

@ -151,10 +151,6 @@ var (
Name: "light",
Usage: "Enable light client mode",
}
NoDefSrvFlag = cli.BoolFlag{
Name: "nodefsrv",
Usage: "Don't add default LES server (only for test version)",
}
LightServFlag = cli.IntFlag{
Name: "lightserv",
Usage: "Maximum percentage of time allowed for serving LES requests (0-90)",
@ -368,6 +364,10 @@ var (
Name: "nodiscover",
Usage: "Disables the peer discovery mechanism (manual peer addition)",
}
DiscoveryV5Flag = cli.BoolFlag{
Name: "v5disc",
Usage: "Enables the experimental RLPx V5 (Topic Discovery) mechanism",
}
WhisperEnabledFlag = cli.BoolFlag{
Name: "shh",
Usage: "Enable Whisper",
@ -511,6 +511,10 @@ func MakeListenAddress(ctx *cli.Context) string {
return fmt.Sprintf(":%d", ctx.GlobalInt(ListenPortFlag.Name))
}
func MakeListenAddressV5(ctx *cli.Context) string {
return fmt.Sprintf(":%d", ctx.GlobalInt(ListenPortFlag.Name)+1)
}
// MakeNAT creates a port mapper from set command line flags.
func MakeNAT(ctx *cli.Context) nat.Interface {
natif, err := nat.Parse(ctx.GlobalString(NATFlag.Name))
@ -641,9 +645,11 @@ func MakeNode(ctx *cli.Context, name, gitCommit string) *node.Node {
Name: name,
Version: vsn,
UserIdent: makeNodeUserIdent(ctx),
NoDiscovery: ctx.GlobalBool(NoDiscoverFlag.Name),
NoDiscovery: ctx.GlobalBool(NoDiscoverFlag.Name) || ctx.GlobalBool(LightModeFlag.Name),
DiscoveryV5: ctx.GlobalBool(DiscoveryV5Flag.Name) || ctx.GlobalBool(LightModeFlag.Name) || ctx.GlobalInt(LightServFlag.Name) > 0,
BootstrapNodes: MakeBootstrapNodes(ctx),
ListenAddr: MakeListenAddress(ctx),
ListenAddrV5: MakeListenAddressV5(ctx),
NAT: MakeNAT(ctx),
MaxPeers: ctx.GlobalInt(MaxPeersFlag.Name),
MaxPendingPeers: ctx.GlobalInt(MaxPendingPeersFlag.Name),
@ -701,7 +707,6 @@ func RegisterEthService(ctx *cli.Context, stack *node.Node, extra []byte) {
ChainConfig: MakeChainConfig(ctx, stack),
FastSync: ctx.GlobalBool(FastSyncFlag.Name),
LightMode: ctx.GlobalBool(LightModeFlag.Name),
NoDefSrv: ctx.GlobalBool(NoDefSrvFlag.Name),
LightServ: ctx.GlobalInt(LightServFlag.Name),
LightPeers: ctx.GlobalInt(LightPeersFlag.Name),
MaxPeers: ctx.GlobalInt(MaxPeersFlag.Name),

101
cmd/v5test/main.go Normal file
View File

@ -0,0 +1,101 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// bootnode runs a bootstrap node for the Ethereum Discovery Protocol.
package main
import (
"flag"
"fmt"
"math/rand"
"strconv"
"time"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/nat"
)
func main() {
var (
listenPort = flag.Int("addr", 31000, "beginning of listening port range")
natdesc = flag.String("nat", "none", "port mapping mechanism (any|none|upnp|pmp|extip:<IP>)")
count = flag.Int("count", 1, "number of v5 topic discovery test nodes (adds default bootnodes to form a test network)")
regtopic = flag.String("reg", "", "topic to register on the network")
looktopic = flag.String("search", "", "topic to search on the network")
)
flag.Var(glog.GetVerbosity(), "verbosity", "log verbosity (0-9)")
flag.Var(glog.GetVModule(), "vmodule", "log verbosity pattern")
glog.SetToStderr(true)
flag.Parse()
natm, err := nat.Parse(*natdesc)
if err != nil {
utils.Fatalf("-nat: %v", err)
}
for i := 0; i < *count; i++ {
listenAddr := ":" + strconv.Itoa(*listenPort+i)
nodeKey, err := crypto.GenerateKey()
if err != nil {
utils.Fatalf("could not generate key: %v", err)
}
if net, err := discv5.ListenUDP(nodeKey, listenAddr, natm, ""); err != nil {
utils.Fatalf("%v", err)
} else {
if err := net.SetFallbackNodes(discv5.BootNodes); err != nil {
utils.Fatalf("%v", err)
}
go func() {
if *looktopic == "" {
for i := 0; i < 20; i++ {
time.Sleep(time.Millisecond * time.Duration(2000+rand.Intn(2001)))
net.BucketFill()
}
}
switch {
case *regtopic != "":
// register topic
fmt.Println("Starting topic register")
stop := make(chan struct{})
net.RegisterTopic(discv5.Topic(*regtopic), stop)
case *looktopic != "":
// search topic
fmt.Println("Starting topic search")
stop := make(chan struct{})
found := make(chan string, 100)
go net.SearchTopic(discv5.Topic(*looktopic), stop, found)
for s := range found {
fmt.Println(time.Now(), s)
}
default:
// just keep doing lookups
for {
time.Sleep(time.Millisecond * time.Duration(40000+rand.Intn(40001)))
net.BucketFill()
}
}
}()
}
fmt.Printf("Started test node #%d with public key %v\n", i, discv5.PubkeyID(&nodeKey.PublicKey))
}
select {}
}

5
eth/backend.go
View File

@ -70,7 +70,6 @@ type Config struct {
Genesis string // Genesis JSON to seed the chain database with
FastSync bool // Enables the state download based fast synchronisation algorithm
LightMode bool // Running in light client mode
NoDefSrv bool // No default LES server
LightServ int // Maximum percentage of time allowed for serving LES requests
LightPeers int // Maximum number of LES client peers
MaxPeers int // Maximum number of global peers
@ -106,7 +105,7 @@ type Config struct {
}
type LesServer interface {
Start()
Start(srvr *p2p.Server)
Stop()
Protocols() []p2p.Protocol
}
@ -434,7 +433,7 @@ func (s *Ethereum) Start(srvr *p2p.Server) error {
}
s.protocolManager.Start()
if s.lesServer != nil {
s.lesServer.Start()
s.lesServer.Start(srvr)
}
return nil
}

2
les/backend.go
View File

@ -196,7 +196,7 @@ func (s *LightEthereum) Protocols() []p2p.Protocol {
// Ethereum protocol implementation.
func (s *LightEthereum) Start(srvr *p2p.Server) error {
s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.netVersionId)
s.protocolManager.Start()
s.protocolManager.Start(srvr)
return nil
}

49
les/handler.go
View File

@ -23,6 +23,7 @@ import (
"fmt"
"math/big"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
@ -36,6 +37,7 @@ import (
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/pow"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
@ -99,6 +101,10 @@ type ProtocolManager struct {
odr *LesOdr
server *LesServer
topicDisc *discv5.Network
lesTopic discv5.Topic
p2pServer *p2p.Server
downloader *downloader.Downloader
fetcher *lightFetcher
peers *peerSet
@ -229,11 +235,52 @@ func (pm *ProtocolManager) removePeer(id string) {
}
}
func (pm *ProtocolManager) Start() {
func (pm *ProtocolManager) findServers() {
if pm.p2pServer == nil {
return
}
enodes := make(chan string, 100)
stop := make(chan struct{})
go pm.topicDisc.SearchTopic(pm.lesTopic, stop, enodes)
go func() {
added := make(map[string]bool)
for {
select {
case enode := <-enodes:
if !added[enode] {
fmt.Println("Found LES server:", enode)
added[enode] = true
if node, err := discover.ParseNode(enode); err == nil {
pm.p2pServer.AddPeer(node)
}
}
case <-stop:
return
}
}
}()
time.Sleep(time.Second * 20)
close(stop)
}
func (pm *ProtocolManager) Start(srvr *p2p.Server) {
pm.p2pServer = srvr
if srvr != nil {
pm.topicDisc = srvr.DiscV5
}
pm.lesTopic = discv5.Topic("LES@" + common.Bytes2Hex(pm.blockchain.Genesis().Hash().Bytes()[0:8]))
if pm.lightSync {
// start sync handler
go pm.findServers()
go pm.syncer()
} else {
if pm.topicDisc != nil {
go func() {
fmt.Println("Starting topic register")
pm.topicDisc.RegisterTopic(pm.lesTopic, pm.quitSync)
fmt.Println("Stopped topic register")
}()
}
go func() {
for range pm.newPeerCh {
}

2
les/helper_test.go
View File

@ -148,7 +148,7 @@ func newTestProtocolManager(lightSync bool, blocks int, generator func(int, *cor
srv.fcManager = flowcontrol.NewClientManager(50, 10, 1000000000)
srv.fcCostStats = newCostStats(nil)
}
pm.Start()
pm.Start(nil)
return pm, db, odr, nil
}

5
les/server.go
View File

@ -66,8 +66,9 @@ func (s *LesServer) Protocols() []p2p.Protocol {
return s.protocolManager.SubProtocols
}
func (s *LesServer) Start() {
s.protocolManager.Start()
func (s *LesServer) Start(srvr *p2p.Server) {
s.protocolManager.Start(srvr)
}
func (s *LesServer) Stop() {

8
light/lightchain.go
View File

@ -106,8 +106,8 @@ func NewLightChain(odr OdrBackend, config *core.ChainConfig, pow pow.PoW, mux *e
// add trusted CHT
if config.DAOForkSupport {
WriteTrustedCht(bc.chainDb, TrustedCht{
Number: 564,
Root: common.HexToHash("ee31f7fc21f627dc2b8d3ed8fed5b74dbc393d146a67249a656e163148e39016"),
Number: 612,
Root: common.HexToHash("8c87a93e0ee531e2aca1b4460e4c201a60c19ffec4f5979262bf14ceeeff8471"),
})
} else {
WriteTrustedCht(bc.chainDb, TrustedCht{
@ -120,8 +120,8 @@ func NewLightChain(odr OdrBackend, config *core.ChainConfig, pow pow.PoW, mux *e
if bc.genesisBlock.Hash() == (common.Hash{12, 215, 134, 162, 66, 93, 22, 241, 82, 198, 88, 49, 108, 66, 62, 108, 225, 24, 30, 21, 195, 41, 88, 38, 215, 201, 144, 76, 186, 156, 227, 3}) {
// add trusted CHT for testnet
WriteTrustedCht(bc.chainDb, TrustedCht{
Number: 319,
Root: common.HexToHash("43b679ff9b4918b0b19e6256f20e35877365ec3e20b38e3b2a02cef5606176dc"),
Number: 436,
Root: common.HexToHash("97a12df5d04d72bde4b4b840e1018e4f08aee34b7d0bf2c5dbfc052b86fe7439"),
})
glog.V(logger.Info).Infoln("Added trusted CHT for testnet")
} else {

4
node/config.go
View File

@ -95,12 +95,16 @@ type Config struct {
// or not. Disabling is usually useful for protocol debugging (manual topology).
NoDiscovery bool
DiscoveryV5 bool
// Bootstrap nodes used to establish connectivity with the rest of the network.
BootstrapNodes []*discover.Node
// Network interface address on which the node should listen for inbound peers.
ListenAddr string
ListenAddrV5 string
// If set to a non-nil value, the given NAT port mapper is used to make the
// listening port available to the Internet.
NAT nat.Interface

2
node/node.go
View File

@ -157,11 +157,13 @@ func (n *Node) Start() error {
PrivateKey: n.config.NodeKey(),
Name: n.config.NodeName(),
Discovery: !n.config.NoDiscovery,
DiscoveryV5: n.config.DiscoveryV5,
BootstrapNodes: n.config.BootstrapNodes,
StaticNodes: n.config.StaticNodes(),
TrustedNodes: n.config.TrusterNodes(),
NodeDatabase: n.config.NodeDB(),
ListenAddr: n.config.ListenAddr,
ListenAddrV5: n.config.ListenAddrV5,
NAT: n.config.NAT,
Dialer: n.config.Dialer,
NoDial: n.config.NoDial,

31
p2p/discv5/crypto.go Normal file
View File

@ -0,0 +1,31 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
//"github.com/btcsuite/btcd/btcec"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
)
func S256() *secp256k1.BitCurve {
return secp256k1.S256()
}
// This version should be used for NaCl compilation
/*func S256() *btcec.KoblitzCurve {
return S256()
}*/

413
p2p/discv5/database.go Normal file
View File

@ -0,0 +1,413 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains the node database, storing previously seen nodes and any collected
// metadata about them for QoS purposes.
package discv5
import (
"bytes"
"crypto/rand"
"encoding/binary"
"os"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/rlp"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/storage"
"github.com/syndtr/goleveldb/leveldb/util"
)
var (
nodeDBNilNodeID = NodeID{} // Special node ID to use as a nil element.
nodeDBNodeExpiration = 24 * time.Hour // Time after which an unseen node should be dropped.
nodeDBCleanupCycle = time.Hour // Time period for running the expiration task.
)
// nodeDB stores all nodes we know about.
type nodeDB struct {
lvl *leveldb.DB // Interface to the database itself
self NodeID // Own node id to prevent adding it into the database
runner sync.Once // Ensures we can start at most one expirer
quit chan struct{} // Channel to signal the expiring thread to stop
}
// Schema layout for the node database
var (
nodeDBVersionKey = []byte("version") // Version of the database to flush if changes
nodeDBItemPrefix = []byte("n:") // Identifier to prefix node entries with
nodeDBDiscoverRoot = ":discover"
nodeDBDiscoverPing = nodeDBDiscoverRoot + ":lastping"
nodeDBDiscoverPong = nodeDBDiscoverRoot + ":lastpong"
nodeDBDiscoverFindFails = nodeDBDiscoverRoot + ":findfail"
nodeDBDiscoverLocalEndpoint = nodeDBDiscoverRoot + ":localendpoint"
nodeDBTopicRegTickets = ":tickets"
)
// newNodeDB creates a new node database for storing and retrieving infos about
// known peers in the network. If no path is given, an in-memory, temporary
// database is constructed.
func newNodeDB(path string, version int, self NodeID) (*nodeDB, error) {
if path == "" {
return newMemoryNodeDB(self)
}
return newPersistentNodeDB(path, version, self)
}
// newMemoryNodeDB creates a new in-memory node database without a persistent
// backend.
func newMemoryNodeDB(self NodeID) (*nodeDB, error) {
db, err := leveldb.Open(storage.NewMemStorage(), nil)
if err != nil {
return nil, err
}
return &nodeDB{
lvl: db,
self: self,
quit: make(chan struct{}),
}, nil
}
// newPersistentNodeDB creates/opens a leveldb backed persistent node database,
// also flushing its contents in case of a version mismatch.
func newPersistentNodeDB(path string, version int, self NodeID) (*nodeDB, error) {
opts := &opt.Options{OpenFilesCacheCapacity: 5}
db, err := leveldb.OpenFile(path, opts)
if _, iscorrupted := err.(*errors.ErrCorrupted); iscorrupted {
db, err = leveldb.RecoverFile(path, nil)
}
if err != nil {
return nil, err
}
// The nodes contained in the cache correspond to a certain protocol version.
// Flush all nodes if the version doesn't match.
currentVer := make([]byte, binary.MaxVarintLen64)
currentVer = currentVer[:binary.PutVarint(currentVer, int64(version))]
blob, err := db.Get(nodeDBVersionKey, nil)
switch err {
case leveldb.ErrNotFound:
// Version not found (i.e. empty cache), insert it
if err := db.Put(nodeDBVersionKey, currentVer, nil); err != nil {
db.Close()
return nil, err
}
case nil:
// Version present, flush if different
if !bytes.Equal(blob, currentVer) {
db.Close()
if err = os.RemoveAll(path); err != nil {
return nil, err
}
return newPersistentNodeDB(path, version, self)
}
}
return &nodeDB{
lvl: db,
self: self,
quit: make(chan struct{}),
}, nil
}
// makeKey generates the leveldb key-blob from a node id and its particular
// field of interest.
func makeKey(id NodeID, field string) []byte {
if bytes.Equal(id[:], nodeDBNilNodeID[:]) {
return []byte(field)
}
return append(nodeDBItemPrefix, append(id[:], field...)...)
}
// splitKey tries to split a database key into a node id and a field part.
func splitKey(key []byte) (id NodeID, field string) {
// If the key is not of a node, return it plainly
if !bytes.HasPrefix(key, nodeDBItemPrefix) {
return NodeID{}, string(key)
}
// Otherwise split the id and field
item := key[len(nodeDBItemPrefix):]
copy(id[:], item[:len(id)])
field = string(item[len(id):])
return id, field
}
// fetchInt64 retrieves an integer instance associated with a particular
// database key.
func (db *nodeDB) fetchInt64(key []byte) int64 {
blob, err := db.lvl.Get(key, nil)
if err != nil {
return 0
}
val, read := binary.Varint(blob)
if read <= 0 {
return 0
}
return val
}
// storeInt64 update a specific database entry to the current time instance as a
// unix timestamp.
func (db *nodeDB) storeInt64(key []byte, n int64) error {
blob := make([]byte, binary.MaxVarintLen64)
blob = blob[:binary.PutVarint(blob, n)]
return db.lvl.Put(key, blob, nil)
}
func (db *nodeDB) storeRLP(key []byte, val interface{}) error {
blob, err := rlp.EncodeToBytes(val)
if err != nil {
return err
}
return db.lvl.Put(key, blob, nil)
}
func (db *nodeDB) fetchRLP(key []byte, val interface{}) error {
blob, err := db.lvl.Get(key, nil)
if err != nil {
return err
}
err = rlp.DecodeBytes(blob, val)
if err != nil {
glog.V(logger.Warn).Infof("key %x (%T) %v", key, val, err)
}
return err
}
// node retrieves a node with a given id from the database.
func (db *nodeDB) node(id NodeID) *Node {
var node Node
if err := db.fetchRLP(makeKey(id, nodeDBDiscoverRoot), &node); err != nil {
return nil
}
node.sha = crypto.Keccak256Hash(node.ID[:])
return &node
}
// updateNode inserts - potentially overwriting - a node into the peer database.
func (db *nodeDB) updateNode(node *Node) error {
return db.storeRLP(makeKey(node.ID, nodeDBDiscoverRoot), node)
}
// deleteNode deletes all information/keys associated with a node.
func (db *nodeDB) deleteNode(id NodeID) error {
deleter := db.lvl.NewIterator(util.BytesPrefix(makeKey(id, "")), nil)
for deleter.Next() {
if err := db.lvl.Delete(deleter.Key(), nil); err != nil {
return err
}
}
return nil
}
// ensureExpirer is a small helper method ensuring that the data expiration
// mechanism is running. If the expiration goroutine is already running, this
// method simply returns.
//
// The goal is to start the data evacuation only after the network successfully
// bootstrapped itself (to prevent dumping potentially useful seed nodes). Since
// it would require significant overhead to exactly trace the first successful
// convergence, it's simpler to "ensure" the correct state when an appropriate
// condition occurs (i.e. a successful bonding), and discard further events.
func (db *nodeDB) ensureExpirer() {
db.runner.Do(func() { go db.expirer() })
}
// expirer should be started in a go routine, and is responsible for looping ad
// infinitum and dropping stale data from the database.
func (db *nodeDB) expirer() {
tick := time.Tick(nodeDBCleanupCycle)
for {
select {
case <-tick:
if err := db.expireNodes(); err != nil {
glog.V(logger.Error).Infof("Failed to expire nodedb items: %v", err)
}
case <-db.quit:
return
}
}
}
// expireNodes iterates over the database and deletes all nodes that have not
// been seen (i.e. received a pong from) for some allotted time.
func (db *nodeDB) expireNodes() error {
threshold := time.Now().Add(-nodeDBNodeExpiration)
// Find discovered nodes that are older than the allowance
it := db.lvl.NewIterator(nil, nil)
defer it.Release()
for it.Next() {
// Skip the item if not a discovery node
id, field := splitKey(it.Key())
if field != nodeDBDiscoverRoot {
continue
}
// Skip the node if not expired yet (and not self)
if bytes.Compare(id[:], db.self[:]) != 0 {
if seen := db.lastPong(id); seen.After(threshold) {
continue
}
}
// Otherwise delete all associated information
db.deleteNode(id)
}
return nil
}
// lastPing retrieves the time of the last ping packet send to a remote node,
// requesting binding.
func (db *nodeDB) lastPing(id NodeID) time.Time {
return time.Unix(db.fetchInt64(makeKey(id, nodeDBDiscoverPing)), 0)
}
// updateLastPing updates the last time we tried contacting a remote node.
func (db *nodeDB) updateLastPing(id NodeID, instance time.Time) error {
return db.storeInt64(makeKey(id, nodeDBDiscoverPing), instance.Unix())
}
// lastPong retrieves the time of the last successful contact from remote node.
func (db *nodeDB) lastPong(id NodeID) time.Time {
return time.Unix(db.fetchInt64(makeKey(id, nodeDBDiscoverPong)), 0)
}
// updateLastPong updates the last time a remote node successfully contacted.
func (db *nodeDB) updateLastPong(id NodeID, instance time.Time) error {
return db.storeInt64(makeKey(id, nodeDBDiscoverPong), instance.Unix())
}
// findFails retrieves the number of findnode failures since bonding.
func (db *nodeDB) findFails(id NodeID) int {
return int(db.fetchInt64(makeKey(id, nodeDBDiscoverFindFails)))
}
// updateFindFails updates the number of findnode failures since bonding.
func (db *nodeDB) updateFindFails(id NodeID, fails int) error {
return db.storeInt64(makeKey(id, nodeDBDiscoverFindFails), int64(fails))
}
// localEndpoint returns the last local endpoint communicated to the
// given remote node.
func (db *nodeDB) localEndpoint(id NodeID) *rpcEndpoint {
var ep rpcEndpoint
if err := db.fetchRLP(makeKey(id, nodeDBDiscoverLocalEndpoint), &ep); err != nil {
return nil
}
return &ep
}
func (db *nodeDB) updateLocalEndpoint(id NodeID, ep rpcEndpoint) error {
return db.storeRLP(makeKey(id, nodeDBDiscoverLocalEndpoint), &ep)
}
// querySeeds retrieves random nodes to be used as potential seed nodes
// for bootstrapping.
func (db *nodeDB) querySeeds(n int, maxAge time.Duration) []*Node {
var (
now = time.Now()
nodes = make([]*Node, 0, n)
it = db.lvl.NewIterator(nil, nil)
id NodeID
)
defer it.Release()
seek:
for seeks := 0; len(nodes) < n && seeks < n*5; seeks++ {
// Seek to a random entry. The first byte is incremented by a
// random amount each time in order to increase the likelihood
// of hitting all existing nodes in very small databases.
ctr := id[0]
rand.Read(id[:])
id[0] = ctr + id[0]%16
it.Seek(makeKey(id, nodeDBDiscoverRoot))
n := nextNode(it)
if n == nil {
id[0] = 0
continue seek // iterator exhausted
}
if n.ID == db.self {
continue seek
}
if now.Sub(db.lastPong(n.ID)) > maxAge {
continue seek
}
for i := range nodes {
if nodes[i].ID == n.ID {
continue seek // duplicate
}
}
nodes = append(nodes, n)
}
return nodes
}
func (db *nodeDB) fetchTopicRegTickets(id NodeID) (issued, used uint32) {
key := makeKey(id, nodeDBTopicRegTickets)
blob, _ := db.lvl.Get(key, nil)
if len(blob) != 8 {
return 0, 0
}
issued = binary.BigEndian.Uint32(blob[0:4])
used = binary.BigEndian.Uint32(blob[4:8])
return
}
func (db *nodeDB) updateTopicRegTickets(id NodeID, issued, used uint32) error {
key := makeKey(id, nodeDBTopicRegTickets)
blob := make([]byte, 8)
binary.BigEndian.PutUint32(blob[0:4], issued)
binary.BigEndian.PutUint32(blob[4:8], used)
return db.lvl.Put(key, blob, nil)
}
// reads the next node record from the iterator, skipping over other
// database entries.
func nextNode(it iterator.Iterator) *Node {
for end := false; !end; end = !it.Next() {
id, field := splitKey(it.Key())
if field != nodeDBDiscoverRoot {
continue
}
var n Node
if err := rlp.DecodeBytes(it.Value(), &n); err != nil {
if glog.V(logger.Warn) {
glog.Errorf("invalid node %x: %v", id, err)
}
continue
}
return &n
}
return nil
}
// close flushes and closes the database files.
func (db *nodeDB) close() {
close(db.quit)
db.lvl.Close()
}

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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"bytes"
"io/ioutil"
"net"
"os"
"path/filepath"
"reflect"
"testing"
"time"
)
var nodeDBKeyTests = []struct {
id NodeID
field string
key []byte
}{
{
id: NodeID{},
field: "version",
key: []byte{0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e}, // field
},
{
id: MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
field: ":discover",
key: []byte{0x6e, 0x3a, // prefix
0x1d, 0xd9, 0xd6, 0x5c, 0x45, 0x52, 0xb5, 0xeb, // node id
0x43, 0xd5, 0xad, 0x55, 0xa2, 0xee, 0x3f, 0x56, //
0xc6, 0xcb, 0xc1, 0xc6, 0x4a, 0x5c, 0x8d, 0x65, //
0x9f, 0x51, 0xfc, 0xd5, 0x1b, 0xac, 0xe2, 0x43, //
0x51, 0x23, 0x2b, 0x8d, 0x78, 0x21, 0x61, 0x7d, //
0x2b, 0x29, 0xb5, 0x4b, 0x81, 0xcd, 0xef, 0xb9, //
0xb3, 0xe9, 0xc3, 0x7d, 0x7f, 0xd5, 0xf6, 0x32, //
0x70, 0xbc, 0xc9, 0xe1, 0xa6, 0xf6, 0xa4, 0x39, //
0x3a, 0x64, 0x69, 0x73, 0x63, 0x6f, 0x76, 0x65, 0x72, // field
},
},
}
func TestNodeDBKeys(t *testing.T) {
for i, tt := range nodeDBKeyTests {
if key := makeKey(tt.id, tt.field); !bytes.Equal(key, tt.key) {
t.Errorf("make test %d: key mismatch: have 0x%x, want 0x%x", i, key, tt.key)
}
id, field := splitKey(tt.key)
if !bytes.Equal(id[:], tt.id[:]) {
t.Errorf("split test %d: id mismatch: have 0x%x, want 0x%x", i, id, tt.id)
}
if field != tt.field {
t.Errorf("split test %d: field mismatch: have 0x%x, want 0x%x", i, field, tt.field)
}
}
}
var nodeDBInt64Tests = []struct {
key []byte
value int64
}{
{key: []byte{0x01}, value: 1},
{key: []byte{0x02}, value: 2},
{key: []byte{0x03}, value: 3},
}
func TestNodeDBInt64(t *testing.T) {
db, _ := newNodeDB("", Version, NodeID{})
defer db.close()
tests := nodeDBInt64Tests
for i := 0; i < len(tests); i++ {
// Insert the next value
if err := db.storeInt64(tests[i].key, tests[i].value); err != nil {
t.Errorf("test %d: failed to store value: %v", i, err)
}
// Check all existing and non existing values
for j := 0; j < len(tests); j++ {
num := db.fetchInt64(tests[j].key)
switch {
case j <= i && num != tests[j].value:
t.Errorf("test %d, item %d: value mismatch: have %v, want %v", i, j, num, tests[j].value)
case j > i && num != 0:
t.Errorf("test %d, item %d: value mismatch: have %v, want %v", i, j, num, 0)
}
}
}
}
func TestNodeDBFetchStore(t *testing.T) {
node := NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{192, 168, 0, 1},
30303,
30303,
)
inst := time.Now()
num := 314
db, _ := newNodeDB("", Version, NodeID{})
defer db.close()
// Check fetch/store operations on a node ping object
if stored := db.lastPing(node.ID); stored.Unix() != 0 {
t.Errorf("ping: non-existing object: %v", stored)
}
if err := db.updateLastPing(node.ID, inst); err != nil {
t.Errorf("ping: failed to update: %v", err)
}
if stored := db.lastPing(node.ID); stored.Unix() != inst.Unix() {
t.Errorf("ping: value mismatch: have %v, want %v", stored, inst)
}
// Check fetch/store operations on a node pong object
if stored := db.lastPong(node.ID); stored.Unix() != 0 {
t.Errorf("pong: non-existing object: %v", stored)
}
if err := db.updateLastPong(node.ID, inst); err != nil {
t.Errorf("pong: failed to update: %v", err)
}
if stored := db.lastPong(node.ID); stored.Unix() != inst.Unix() {
t.Errorf("pong: value mismatch: have %v, want %v", stored, inst)
}
// Check fetch/store operations on a node findnode-failure object
if stored := db.findFails(node.ID); stored != 0 {
t.Errorf("find-node fails: non-existing object: %v", stored)
}
if err := db.updateFindFails(node.ID, num); err != nil {
t.Errorf("find-node fails: failed to update: %v", err)
}
if stored := db.findFails(node.ID); stored != num {
t.Errorf("find-node fails: value mismatch: have %v, want %v", stored, num)
}
// Check fetch/store operations on an actual node object
if stored := db.node(node.ID); stored != nil {
t.Errorf("node: non-existing object: %v", stored)
}
if err := db.updateNode(node); err != nil {
t.Errorf("node: failed to update: %v", err)
}
if stored := db.node(node.ID); stored == nil {
t.Errorf("node: not found")
} else if !reflect.DeepEqual(stored, node) {
t.Errorf("node: data mismatch: have %v, want %v", stored, node)
}
}
var nodeDBSeedQueryNodes = []struct {
node *Node
pong time.Time
}{
// This one should not be in the result set because its last
// pong time is too far in the past.
{
node: NewNode(
MustHexID("0x84d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 3},
30303,
30303,
),
pong: time.Now().Add(-3 * time.Hour),
},
// This one shouldn't be in in the result set because its
// nodeID is the local node's ID.
{
node: NewNode(
MustHexID("0x57d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 3},
30303,
30303,
),
pong: time.Now().Add(-4 * time.Second),
},
// These should be in the result set.
{
node: NewNode(
MustHexID("0x22d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 1},
30303,
30303,
),
pong: time.Now().Add(-2 * time.Second),
},
{
node: NewNode(
MustHexID("0x44d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 2},
30303,
30303,
),
pong: time.Now().Add(-3 * time.Second),
},
{
node: NewNode(
MustHexID("0xe2d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 3},
30303,
30303,
),
pong: time.Now().Add(-1 * time.Second),
},
}
func TestNodeDBSeedQuery(t *testing.T) {
db, _ := newNodeDB("", Version, nodeDBSeedQueryNodes[1].node.ID)
defer db.close()
// Insert a batch of nodes for querying
for i, seed := range nodeDBSeedQueryNodes {
if err := db.updateNode(seed.node); err != nil {
t.Fatalf("node %d: failed to insert: %v", i, err)
}
if err := db.updateLastPong(seed.node.ID, seed.pong); err != nil {
t.Fatalf("node %d: failed to insert lastPong: %v", i, err)
}
}
// Retrieve the entire batch and check for duplicates
seeds := db.querySeeds(len(nodeDBSeedQueryNodes)*2, time.Hour)
have := make(map[NodeID]struct{})
for _, seed := range seeds {
have[seed.ID] = struct{}{}
}
want := make(map[NodeID]struct{})
for _, seed := range nodeDBSeedQueryNodes[2:] {
want[seed.node.ID] = struct{}{}
}
if len(seeds) != len(want) {
t.Errorf("seed count mismatch: have %v, want %v", len(seeds), len(want))
}
for id, _ := range have {
if _, ok := want[id]; !ok {
t.Errorf("extra seed: %v", id)
}
}
for id, _ := range want {
if _, ok := have[id]; !ok {
t.Errorf("missing seed: %v", id)
}
}
}
func TestNodeDBPersistency(t *testing.T) {
root, err := ioutil.TempDir("", "nodedb-")
if err != nil {
t.Fatalf("failed to create temporary data folder: %v", err)
}
defer os.RemoveAll(root)
var (
testKey = []byte("somekey")
testInt = int64(314)
)
// Create a persistent database and store some values
db, err := newNodeDB(filepath.Join(root, "database"), Version, NodeID{})
if err != nil {
t.Fatalf("failed to create persistent database: %v", err)
}
if err := db.storeInt64(testKey, testInt); err != nil {
t.Fatalf("failed to store value: %v.", err)
}
db.close()
// Reopen the database and check the value
db, err = newNodeDB(filepath.Join(root, "database"), Version, NodeID{})
if err != nil {
t.Fatalf("failed to open persistent database: %v", err)
}
if val := db.fetchInt64(testKey); val != testInt {
t.Fatalf("value mismatch: have %v, want %v", val, testInt)
}
db.close()
// Change the database version and check flush
db, err = newNodeDB(filepath.Join(root, "database"), Version+1, NodeID{})
if err != nil {
t.Fatalf("failed to open persistent database: %v", err)
}
if val := db.fetchInt64(testKey); val != 0 {
t.Fatalf("value mismatch: have %v, want %v", val, 0)
}
db.close()
}
var nodeDBExpirationNodes = []struct {
node *Node
pong time.Time
exp bool
}{
{
node: NewNode(
MustHexID("0x01d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 1},
30303,
30303,
),
pong: time.Now().Add(-nodeDBNodeExpiration + time.Minute),
exp: false,
}, {
node: NewNode(
MustHexID("0x02d9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{127, 0, 0, 2},
30303,
30303,
),
pong: time.Now().Add(-nodeDBNodeExpiration - time.Minute),
exp: true,
},
}
func TestNodeDBExpiration(t *testing.T) {
db, _ := newNodeDB("", Version, NodeID{})
defer db.close()
// Add all the test nodes and set their last pong time
for i, seed := range nodeDBExpirationNodes {
if err := db.updateNode(seed.node); err != nil {
t.Fatalf("node %d: failed to insert: %v", i, err)
}
if err := db.updateLastPong(seed.node.ID, seed.pong); err != nil {
t.Fatalf("node %d: failed to update pong: %v", i, err)
}
}
// Expire some of them, and check the rest
if err := db.expireNodes(); err != nil {
t.Fatalf("failed to expire nodes: %v", err)
}
for i, seed := range nodeDBExpirationNodes {
node := db.node(seed.node.ID)
if (node == nil && !seed.exp) || (node != nil && seed.exp) {
t.Errorf("node %d: expiration mismatch: have %v, want %v", i, node, seed.exp)
}
}
}
func TestNodeDBSelfExpiration(t *testing.T) {
// Find a node in the tests that shouldn't expire, and assign it as self
var self NodeID
for _, node := range nodeDBExpirationNodes {
if !node.exp {
self = node.node.ID
break
}
}
db, _ := newNodeDB("", Version, self)
defer db.close()
// Add all the test nodes and set their last pong time
for i, seed := range nodeDBExpirationNodes {
if err := db.updateNode(seed.node); err != nil {
t.Fatalf("node %d: failed to insert: %v", i, err)
}
if err := db.updateLastPong(seed.node.ID, seed.pong); err != nil {
t.Fatalf("node %d: failed to update pong: %v", i, err)
}
}
// Expire the nodes and make sure self has been evacuated too
if err := db.expireNodes(); err != nil {
t.Fatalf("failed to expire nodes: %v", err)
}
node := db.node(self)
if node != nil {
t.Errorf("self not evacuated")
}
}

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"fmt"
"net"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
func TestNetwork_Lookup(t *testing.T) {
key, _ := crypto.GenerateKey()
network, err := newNetwork(lookupTestnet, key.PublicKey, nil, "")
if err != nil {
t.Fatal(err)
}
lookupTestnet.net = network
defer network.Close()
// lookup on empty table returns no nodes
// if results := network.Lookup(lookupTestnet.target, false); len(results) > 0 {
// t.Fatalf("lookup on empty table returned %d results: %#v", len(results), results)
// }
// seed table with initial node (otherwise lookup will terminate immediately)
seeds := []*Node{NewNode(lookupTestnet.dists[256][0], net.IP{}, 256, 999)}
if err := network.SetFallbackNodes(seeds); err != nil {
t.Fatal(err)
}
time.Sleep(3 * time.Second)
results := network.Lookup(lookupTestnet.target)
t.Logf("results:")
for _, e := range results {
t.Logf(" ld=%d, %x", logdist(lookupTestnet.targetSha, e.sha), e.sha[:])
}
if len(results) != bucketSize {
t.Errorf("wrong number of results: got %d, want %d", len(results), bucketSize)
}
if hasDuplicates(results) {
t.Errorf("result set contains duplicate entries")
}
if !sortedByDistanceTo(lookupTestnet.targetSha, results) {
t.Errorf("result set not sorted by distance to target")
}
// TODO: check result nodes are actually closest
}
// This is the test network for the Lookup test.
// The nodes were obtained by running testnet.mine with a random NodeID as target.
var lookupTestnet = &preminedTestnet{
target: MustHexID("166aea4f556532c6d34e8b740e5d314af7e9ac0ca79833bd751d6b665f12dfd38ec563c363b32f02aef4a80b44fd3def94612d497b99cb5f17fd24de454927ec"),
targetSha: common.Hash{0x5c, 0x94, 0x4e, 0xe5, 0x1c, 0x5a, 0xe9, 0xf7, 0x2a, 0x95, 0xec, 0xcb, 0x8a, 0xed, 0x3, 0x74, 0xee, 0xcb, 0x51, 0x19, 0xd7, 0x20, 0xcb, 0xea, 0x68, 0x13, 0xe8, 0xe0, 0xd6, 0xad, 0x92, 0x61},
dists: [257][]NodeID{
240: []NodeID{
MustHexID("2001ad5e3e80c71b952161bc0186731cf5ffe942d24a79230a0555802296238e57ea7a32f5b6f18564eadc1c65389448481f8c9338df0a3dbd18f708cbc2cbcb"),
MustHexID("6ba3f4f57d084b6bf94cc4555b8c657e4a8ac7b7baf23c6874efc21dd1e4f56b7eb2721e07f5242d2f1d8381fc8cae535e860197c69236798ba1ad231b105794"),
},
244: []NodeID{
MustHexID("696ba1f0a9d55c59246f776600542a9e6432490f0cd78f8bb55a196918df2081a9b521c3c3ba48e465a75c10768807717f8f689b0b4adce00e1c75737552a178"),
},
246: []NodeID{
MustHexID("d6d32178bdc38416f46ffb8b3ec9e4cb2cfff8d04dd7e4311a70e403cb62b10be1b447311b60b4f9ee221a8131fc2cbd45b96dd80deba68a949d467241facfa8"),
MustHexID("3ea3d04a43a3dfb5ac11cffc2319248cf41b6279659393c2f55b8a0a5fc9d12581a9d97ef5d8ff9b5abf3321a290e8f63a4f785f450dc8a672aba3ba2ff4fdab"),
MustHexID("2fc897f05ae585553e5c014effd3078f84f37f9333afacffb109f00ca8e7a3373de810a3946be971cbccdfd40249f9fe7f322118ea459ac71acca85a1ef8b7f4"),
},
247: []NodeID{
MustHexID("3155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32"),
MustHexID("312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069db"),
MustHexID("38643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aac"),
MustHexID("8dcab8618c3253b558d459da53bd8fa68935a719aff8b811197101a4b2b47dd2d47295286fc00cc081bb542d760717d1bdd6bec2c37cd72eca367d6dd3b9df73"),
MustHexID("8b58c6073dd98bbad4e310b97186c8f822d3a5c7d57af40e2136e88e315afd115edb27d2d0685a908cfe5aa49d0debdda6e6e63972691d6bd8c5af2d771dd2a9"),
MustHexID("2cbb718b7dc682da19652e7d9eb4fefaf7b7147d82c1c2b6805edf77b85e29fde9f6da195741467ff2638dc62c8d3e014ea5686693c15ed0080b6de90354c137"),
MustHexID("e84027696d3f12f2de30a9311afea8fbd313c2360daff52bb5fc8c7094d5295758bec3134e4eef24e4cdf377b40da344993284628a7a346eba94f74160998feb"),
MustHexID("f1357a4f04f9d33753a57c0b65ba20a5d8777abbffd04e906014491c9103fb08590e45548d37aa4bd70965e2e81ddba94f31860348df01469eec8c1829200a68"),
MustHexID("4ab0a75941b12892369b4490a1928c8ca52a9ad6d3dffbd1d8c0b907bc200fe74c022d011ec39b64808a39c0ca41f1d3254386c3e7733e7044c44259486461b6"),
MustHexID("d45150a72dc74388773e68e03133a3b5f51447fe91837d566706b3c035ee4b56f160c878c6273394daee7f56cc398985269052f22f75a8057df2fe6172765354"),
},
248: []NodeID{
MustHexID("6aadfce366a189bab08ac84721567483202c86590642ea6d6a14f37ca78d82bdb6509eb7b8b2f6f63c78ae3ae1d8837c89509e41497d719b23ad53dd81574afa"),
MustHexID("a605ecfd6069a4cf4cf7f5840e5bc0ce10d23a3ac59e2aaa70c6afd5637359d2519b4524f56fc2ca180cdbebe54262f720ccaae8c1b28fd553c485675831624d"),
MustHexID("29701451cb9448ca33fc33680b44b840d815be90146eb521641efbffed0859c154e8892d3906eae9934bfacee72cd1d2fa9dd050fd18888eea49da155ab0efd2"),
MustHexID("3ed426322dee7572b08592e1e079f8b6c6b30e10e6243edd144a6a48fdbdb83df73a6e41b1143722cb82604f2203a32758610b5d9544f44a1a7921ba001528c1"),
MustHexID("b2e2a2b7fdd363572a3256e75435fab1da3b16f7891a8bd2015f30995dae665d7eabfd194d87d99d5df628b4bbc7b04e5b492c596422dd8272746c7a1b0b8e4f"),
MustHexID("0c69c9756162c593e85615b814ce57a2a8ca2df6c690b9c4e4602731b61e1531a3bbe3f7114271554427ffabea80ad8f36fa95a49fa77b675ae182c6ccac1728"),
MustHexID("8d28be21d5a97b0876442fa4f5e5387f5bf3faad0b6f13b8607b64d6e448c0991ca28dd7fe2f64eb8eadd7150bff5d5666aa6ed868b84c71311f4ba9a38569dd"),
MustHexID("2c677e1c64b9c9df6359348a7f5f33dc79e22f0177042486d125f8b6ca7f0dc756b1f672aceee5f1746bcff80aaf6f92a8dc0c9fbeb259b3fa0da060de5ab7e8"),
MustHexID("3994880f94a8678f0cd247a43f474a8af375d2a072128da1ad6cae84a244105ff85e94fc7d8496f639468de7ee998908a91c7e33ef7585fff92e984b210941a1"),
MustHexID("b45a9153c08d002a48090d15d61a7c7dad8c2af85d4ff5bd36ce23a9a11e0709bf8d56614c7b193bc028c16cbf7f20dfbcc751328b64a924995d47b41e452422"),
MustHexID("057ab3a9e53c7a84b0f3fc586117a525cdd18e313f52a67bf31798d48078e325abe5cfee3f6c2533230cb37d0549289d692a29dd400e899b8552d4b928f6f907"),
MustHexID("0ddf663d308791eb92e6bd88a2f8cb45e4f4f35bb16708a0e6ff7f1362aa6a73fedd0a1b1557fb3365e38e1b79d6918e2fae2788728b70c9ab6b51a3b94a4338"),
MustHexID("f637e07ff50cc1e3731735841c4798411059f2023abcf3885674f3e8032531b0edca50fd715df6feb489b6177c345374d64f4b07d257a7745de393a107b013a5"),
MustHexID("e24ec7c6eec094f63c7b3239f56d311ec5a3e45bc4e622a1095a65b95eea6fe13e29f3b6b7a2cbfe40906e3989f17ac834c3102dd0cadaaa26e16ee06d782b72"),
MustHexID("b76ea1a6fd6506ef6e3506a4f1f60ed6287fff8114af6141b2ff13e61242331b54082b023cfea5b3083354a4fb3f9eb8be01fb4a518f579e731a5d0707291a6b"),
MustHexID("9b53a37950ca8890ee349b325032d7b672cab7eced178d3060137b24ef6b92a43977922d5bdfb4a3409a2d80128e02f795f9dae6d7d99973ad0e23a2afb8442f"),
},
249: []NodeID{
MustHexID("675ae65567c3c72c50c73bc0fd4f61f202ea5f93346ca57b551de3411ccc614fad61cb9035493af47615311b9d44ee7a161972ee4d77c28fe1ec029d01434e6a"),
MustHexID("8eb81408389da88536ae5800392b16ef5109d7ea132c18e9a82928047ecdb502693f6e4a4cdd18b54296caf561db937185731456c456c98bfe7de0baf0eaa495"),
MustHexID("2adba8b1612a541771cb93a726a38a4b88e97b18eced2593eb7daf82f05a5321ca94a72cc780c306ff21e551a932fc2c6d791e4681907b5ceab7f084c3fa2944"),
MustHexID("b1b4bfbda514d9b8f35b1c28961da5d5216fe50548f4066f69af3b7666a3b2e06eac646735e963e5c8f8138a2fb95af15b13b23ff00c6986eccc0efaa8ee6fb4"),
MustHexID("d2139281b289ad0e4d7b4243c4364f5c51aac8b60f4806135de06b12b5b369c9e43a6eb494eab860d115c15c6fbb8c5a1b0e382972e0e460af395b8385363de7"),
MustHexID("4a693df4b8fc5bdc7cec342c3ed2e228d7c5b4ab7321ddaa6cccbeb45b05a9f1d95766b4002e6d4791c2deacb8a667aadea6a700da28a3eea810a30395701bbc"),
MustHexID("ab41611195ec3c62bb8cd762ee19fb182d194fd141f4a66780efbef4b07ce916246c022b841237a3a6b512a93431157edd221e854ed2a259b72e9c5351f44d0c"),
MustHexID("68e8e26099030d10c3c703ae7045c0a48061fb88058d853b3e67880014c449d4311014da99d617d3150a20f1a3da5e34bf0f14f1c51fe4dd9d58afd222823176"),
MustHexID("3fbcacf546fb129cd70fc48de3b593ba99d3c473798bc309292aca280320e0eacc04442c914cad5c4cf6950345ba79b0d51302df88285d4e83ee3fe41339eee7"),
MustHexID("1d4a623659f7c8f80b6c3939596afdf42e78f892f682c768ad36eb7bfba402dbf97aea3a268f3badd8fe7636be216edf3d67ee1e08789ebbc7be625056bd7109"),
MustHexID("a283c474ab09da02bbc96b16317241d0627646fcc427d1fe790b76a7bf1989ced90f92101a973047ae9940c92720dffbac8eff21df8cae468a50f72f9e159417"),
MustHexID("dbf7e5ad7f87c3dfecae65d87c3039e14ed0bdc56caf00ce81931073e2e16719d746295512ff7937a15c3b03603e7c41a4f9df94fcd37bb200dd8f332767e9cb"),
MustHexID("caaa070a26692f64fc77f30d7b5ae980d419b4393a0f442b1c821ef58c0862898b0d22f74a4f8c5d83069493e3ec0b92f17dc1fe6e4cd437c1ec25039e7ce839"),
MustHexID("874cc8d1213beb65c4e0e1de38ef5d8165235893ac74ab5ea937c885eaab25c8d79dad0456e9fd3e9450626cac7e107b004478fb59842f067857f39a47cee695"),
MustHexID("d94193f236105010972f5df1b7818b55846592a0445b9cdc4eaed811b8c4c0f7c27dc8cc9837a4774656d6b34682d6d329d42b6ebb55da1d475c2474dc3dfdf4"),
MustHexID("edd9af6aded4094e9785637c28fccbd3980cbe28e2eb9a411048a23c2ace4bd6b0b7088a7817997b49a3dd05fc6929ca6c7abbb69438dbdabe65e971d2a794b2"),
},
250: []NodeID{
MustHexID("53a5bd1215d4ab709ae8fdc2ced50bba320bced78bd9c5dc92947fb402250c914891786db0978c898c058493f86fc68b1c5de8a5cb36336150ac7a88655b6c39"),
MustHexID("b7f79e3ab59f79262623c9ccefc8f01d682323aee56ffbe295437487e9d5acaf556a9c92e1f1c6a9601f2b9eb6b027ae1aeaebac71d61b9b78e88676efd3e1a3"),
MustHexID("d374bf7e8d7ffff69cc00bebff38ef5bc1dcb0a8d51c1a3d70e61ac6b2e2d6617109254b0ac224354dfbf79009fe4239e09020c483cc60c071e00b9238684f30"),
MustHexID("1e1eac1c9add703eb252eb991594f8f5a173255d526a855fab24ae57dc277e055bc3c7a7ae0b45d437c4f47a72d97eb7b126f2ba344ba6c0e14b2c6f27d4b1e6"),
MustHexID("ae28953f63d4bc4e706712a59319c111f5ff8f312584f65d7436b4cd3d14b217b958f8486bad666b4481fe879019fb1f767cf15b3e3e2711efc33b56d460448a"),
MustHexID("934bb1edf9c7a318b82306aca67feb3d6b434421fa275d694f0b4927afd8b1d3935b727fd4ff6e3d012e0c82f1824385174e8c6450ade59c2a43281a4b3446b6"),
MustHexID("9eef3f28f70ce19637519a0916555bf76d26de31312ac656cf9d3e379899ea44e4dd7ffcce923b4f3563f8a00489a34bd6936db0cbb4c959d32c49f017e07d05"),
MustHexID("82200872e8f871c48f1fad13daec6478298099b591bb3dbc4ef6890aa28ebee5860d07d70be62f4c0af85085a90ae8179ee8f937cf37915c67ea73e704b03ee7"),
MustHexID("6c75a5834a08476b7fc37ff3dc2011dc3ea3b36524bad7a6d319b18878fad813c0ba76d1f4555cacd3890c865438c21f0e0aed1f80e0a157e642124c69f43a11"),
MustHexID("995b873742206cb02b736e73a88580c2aacb0bd4a3c97a647b647bcab3f5e03c0e0736520a8b3600da09edf4248991fb01091ec7ff3ec7cdc8a1beae011e7aae"),
MustHexID("c773a056594b5cdef2e850d30891ff0e927c3b1b9c35cd8e8d53a1017001e237468e1ece3ae33d612ca3e6abb0a9169aa352e9dcda358e5af2ad982b577447db"),
MustHexID("2b46a5f6923f475c6be99ec6d134437a6d11f6bb4b4ac6bcd94572fa1092639d1c08aeefcb51f0912f0a060f71d4f38ee4da70ecc16010b05dd4a674aab14c3a"),
MustHexID("af6ab501366debbaa0d22e20e9688f32ef6b3b644440580fd78de4fe0e99e2a16eb5636bbae0d1c259df8ddda77b35b9a35cbc36137473e9c68fbc9d203ba842"),
MustHexID("c9f6f2dd1a941926f03f770695bda289859e85fabaf94baaae20b93e5015dc014ba41150176a36a1884adb52f405194693e63b0c464a6891cc9cc1c80d450326"),
MustHexID("5b116f0751526868a909b61a30b0c5282c37df6925cc03ddea556ef0d0602a9595fd6c14d371f8ed7d45d89918a032dcd22be4342a8793d88fdbeb3ca3d75bd7"),
MustHexID("50f3222fb6b82481c7c813b2172e1daea43e2710a443b9c2a57a12bd160dd37e20f87aa968c82ad639af6972185609d47036c0d93b4b7269b74ebd7073221c10"),
},
251: []NodeID{
MustHexID("9b8f702a62d1bee67bedfeb102eca7f37fa1713e310f0d6651cc0c33ea7c5477575289ccd463e5a2574a00a676a1fdce05658ba447bb9d2827f0ba47b947e894"),
MustHexID("b97532eb83054ed054b4abdf413bb30c00e4205545c93521554dbe77faa3cfaa5bd31ef466a107b0b34a71ec97214c0c83919720142cddac93aa7a3e928d4708"),
MustHexID("2f7a5e952bfb67f2f90b8441b5fadc9ee13b1dcde3afeeb3dd64bf937f86663cc5c55d1fa83952b5422763c7df1b7f2794b751c6be316ebc0beb4942e65ab8c1"),
MustHexID("42c7483781727051a0b3660f14faf39e0d33de5e643702ae933837d036508ab856ce7eec8ec89c4929a4901256e5233a3d847d5d4893f91bcf21835a9a880fee"),
MustHexID("873bae27bf1dc854408fba94046a53ab0c965cebe1e4e12290806fc62b88deb1f4a47f9e18f78fc0e7913a0c6e42ac4d0fc3a20cea6bc65f0c8a0ca90b67521e"),
MustHexID("a7e3a370bbd761d413f8d209e85886f68bf73d5c3089b2dc6fa42aab1ecb5162635497eed95dee2417f3c9c74a3e76319625c48ead2e963c7de877cd4551f347"),
MustHexID("528597534776a40df2addaaea15b6ff832ce36b9748a265768368f657e76d58569d9f30dbb91e91cf0ae7efe8f402f17aa0ae15f5c55051ba03ba830287f4c42"),
MustHexID("461d8bd4f13c3c09031fdb84f104ed737a52f630261463ce0bdb5704259bab4b737dda688285b8444dbecaecad7f50f835190b38684ced5e90c54219e5adf1bc"),
MustHexID("6ec50c0be3fd232737090fc0111caaf0bb6b18f72be453428087a11a97fd6b52db0344acbf789a689bd4f5f50f79017ea784f8fd6fe723ad6ae675b9e3b13e21"),
MustHexID("12fc5e2f77a83fdcc727b79d8ae7fe6a516881138d3011847ee136b400fed7cfba1f53fd7a9730253c7aa4f39abeacd04f138417ba7fcb0f36cccc3514e0dab6"),
MustHexID("4fdbe75914ccd0bce02101606a1ccf3657ec963e3b3c20239d5fec87673fe446d649b4f15f1fe1a40e6cfbd446dda2d31d40bb602b1093b8fcd5f139ba0eb46a"),
MustHexID("3753668a0f6281e425ea69b52cb2d17ab97afbe6eb84cf5d25425bc5e53009388857640668fadd7c110721e6047c9697803bd8a6487b43bb343bfa32ebf24039"),
MustHexID("2e81b16346637dec4410fd88e527346145b9c0a849dbf2628049ac7dae016c8f4305649d5659ec77f1e8a0fac0db457b6080547226f06283598e3740ad94849a"),
MustHexID("802c3cc27f91c89213223d758f8d2ecd41135b357b6d698f24d811cdf113033a81c38e0bdff574a5c005b00a8c193dc2531f8c1fa05fa60acf0ab6f2858af09f"),
MustHexID("fcc9a2e1ac3667026ff16192876d1813bb75abdbf39b929a92863012fe8b1d890badea7a0de36274d5c1eb1e8f975785532c50d80fd44b1a4b692f437303393f"),
MustHexID("6d8b3efb461151dd4f6de809b62726f5b89e9b38e9ba1391967f61cde844f7528fecf821b74049207cee5a527096b31f3ad623928cd3ce51d926fa345a6b2951"),
},
252: []NodeID{
MustHexID("f1ae93157cc48c2075dd5868fbf523e79e06caf4b8198f352f6e526680b78ff4227263de92612f7d63472bd09367bb92a636fff16fe46ccf41614f7a72495c2a"),
MustHexID("587f482d111b239c27c0cb89b51dd5d574db8efd8de14a2e6a1400c54d4567e77c65f89c1da52841212080b91604104768350276b6682f2f961cdaf4039581c7"),
MustHexID("e3f88274d35cefdaabdf205afe0e80e936cc982b8e3e47a84ce664c413b29016a4fb4f3a3ebae0a2f79671f8323661ed462bf4390af94c424dc8ace0c301b90f"),
MustHexID("0ddc736077da9a12ba410dc5ea63cbcbe7659dd08596485b2bff3435221f82c10d263efd9af938e128464be64a178b7cd22e19f400d5802f4c9df54bf89f2619"),
MustHexID("784aa34d833c6ce63fcc1279630113c3272e82c4ae8c126c5a52a88ac461b6baeed4244e607b05dc14e5b2f41c70a273c3804dea237f14f7a1e546f6d1309d14"),
MustHexID("f253a2c354ee0e27cfcae786d726753d4ad24be6516b279a936195a487de4a59dbc296accf20463749ff55293263ed8c1b6365eecb248d44e75e9741c0d18205"),
MustHexID("a1910b80357b3ad9b4593e0628922939614dc9056a5fbf477279c8b2c1d0b4b31d89a0c09d0d41f795271d14d3360ef08a3f821e65e7e1f56c07a36afe49c7c5"),
MustHexID("f1168552c2efe541160f0909b0b4a9d6aeedcf595cdf0e9b165c97e3e197471a1ee6320e93389edfba28af6eaf10de98597ad56e7ab1b504ed762451996c3b98"),
MustHexID("b0c8e5d2c8634a7930e1a6fd082e448c6cf9d2d8b7293558b59238815a4df926c286bf297d2049f14e8296a6eb3256af614ec1812c4f2bbe807673b58bf14c8c"),
MustHexID("0fb346076396a38badc342df3679b55bd7f40a609ab103411fe45082c01f12ea016729e95914b2b5540e987ff5c9b133e85862648e7f36abdfd23100d248d234"),
MustHexID("f736e0cc83417feaa280d9483f5d4d72d1b036cd0c6d9cbdeb8ac35ceb2604780de46dddaa32a378474e1d5ccdf79b373331c30c7911ade2ae32f98832e5de1f"),
MustHexID("8b02991457602f42b38b342d3f2259ae4100c354b3843885f7e4e07bd644f64dab94bb7f38a3915f8b7f11d8e3f81c28e07a0078cf79d7397e38a7b7e0c857e2"),
MustHexID("9221d9f04a8a184993d12baa91116692bb685f887671302999d69300ad103eb2d2c75a09d8979404c6dd28f12362f58a1a43619c493d9108fd47588a23ce5824"),
MustHexID("652797801744dada833fff207d67484742eea6835d695925f3e618d71b68ec3c65bdd85b4302b2cdcb835ad3f94fd00d8da07e570b41bc0d2bcf69a8de1b3284"),
MustHexID("d84f06fe64debc4cd0625e36d19b99014b6218375262cc2209202bdbafd7dffcc4e34ce6398e182e02fd8faeed622c3e175545864902dfd3d1ac57647cddf4c6"),
MustHexID("d0ed87b294f38f1d741eb601020eeec30ac16331d05880fe27868f1e454446de367d7457b41c79e202eaf9525b029e4f1d7e17d85a55f83a557c005c68d7328a"),
},
253: []NodeID{
MustHexID("ad4485e386e3cc7c7310366a7c38fb810b8896c0d52e55944bfd320ca294e7912d6c53c0a0cf85e7ce226e92491d60430e86f8f15cda0161ed71893fb4a9e3a1"),
MustHexID("36d0e7e5b7734f98c6183eeeb8ac5130a85e910a925311a19c4941b1290f945d4fc3996b12ef4966960b6fa0fb29b1604f83a0f81bd5fd6398d2e1a22e46af0c"),
MustHexID("7d307d8acb4a561afa23bdf0bd945d35c90245e26345ec3a1f9f7df354222a7cdcb81339c9ed6744526c27a1a0c8d10857e98df942fa433602facac71ac68a31"),
MustHexID("d97bf55f88c83fae36232661af115d66ca600fc4bd6d1fb35ff9bb4dad674c02cf8c8d05f317525b5522250db58bb1ecafb7157392bf5aa61b178c61f098d995"),
MustHexID("7045d678f1f9eb7a4613764d17bd5698796494d0bf977b16f2dbc272b8a0f7858a60805c022fc3d1fe4f31c37e63cdaca0416c0d053ef48a815f8b19121605e0"),
MustHexID("14e1f21418d445748de2a95cd9a8c3b15b506f86a0acabd8af44bb968ce39885b19c8822af61b3dd58a34d1f265baec30e3ae56149dc7d2aa4a538f7319f69c8"),
MustHexID("b9453d78281b66a4eac95a1546017111eaaa5f92a65d0de10b1122940e92b319728a24edf4dec6acc412321b1c95266d39c7b3a5d265c629c3e49a65fb022c09"),
MustHexID("e8a49248419e3824a00d86af422f22f7366e2d4922b304b7169937616a01d9d6fa5abf5cc01061a352dc866f48e1fa2240dbb453d872b1d7be62bdfc1d5e248c"),
MustHexID("bebcff24b52362f30e0589ee573ce2d86f073d58d18e6852a592fa86ceb1a6c9b96d7fb9ec7ed1ed98a51b6743039e780279f6bb49d0a04327ac7a182d9a56f6"),
MustHexID("d0835e5a4291db249b8d2fca9f503049988180c7d247bedaa2cf3a1bad0a76709360a85d4f9a1423b2cbc82bb4d94b47c0cde20afc430224834c49fe312a9ae3"),
MustHexID("6b087fe2a2da5e4f0b0f4777598a4a7fb66bf77dbd5bfc44e8a7eaa432ab585a6e226891f56a7d4f5ed11a7c57b90f1661bba1059590ca4267a35801c2802913"),
MustHexID("d901e5bde52d1a0f4ddf010a686a53974cdae4ebe5c6551b3c37d6b6d635d38d5b0e5f80bc0186a2c7809dbf3a42870dd09643e68d32db896c6da8ba734579e7"),
MustHexID("96419fb80efae4b674402bb969ebaab86c1274f29a83a311e24516d36cdf148fe21754d46c97688cdd7468f24c08b13e4727c29263393638a3b37b99ff60ebca"),
MustHexID("7b9c1889ae916a5d5abcdfb0aaedcc9c6f9eb1c1a4f68d0c2d034fe79ac610ce917c3abc670744150fa891bfcd8ab14fed6983fca964de920aa393fa7b326748"),
MustHexID("7a369b2b8962cc4c65900be046482fbf7c14f98a135bbbae25152c82ad168fb2097b3d1429197cf46d3ce9fdeb64808f908a489cc6019725db040060fdfe5405"),
MustHexID("47bcae48288da5ecc7f5058dfa07cf14d89d06d6e449cb946e237aa6652ea050d9f5a24a65efdc0013ccf232bf88670979eddef249b054f63f38da9d7796dbd8"),
},
254: []NodeID{
MustHexID("099739d7abc8abd38ecc7a816c521a1168a4dbd359fa7212a5123ab583ffa1cf485a5fed219575d6475dbcdd541638b2d3631a6c7fce7474e7fe3cba1d4d5853"),
MustHexID("c2b01603b088a7182d0cf7ef29fb2b04c70acb320fccf78526bf9472e10c74ee70b3fcfa6f4b11d167bd7d3bc4d936b660f2c9bff934793d97cb21750e7c3d31"),
MustHexID("20e4d8f45f2f863e94b45548c1ef22a11f7d36f263e4f8623761e05a64c4572379b000a52211751e2561b0f14f4fc92dd4130410c8ccc71eb4f0e95a700d4ca9"),
MustHexID("27f4a16cc085e72d86e25c98bd2eca173eaaee7565c78ec5a52e9e12b2211f35de81b5b45e9195de2ebfe29106742c59112b951a04eb7ae48822911fc1f9389e"),
MustHexID("55db5ee7d98e7f0b1c3b9d5be6f2bc619a1b86c3cdd513160ad4dcf267037a5fffad527ac15d50aeb32c59c13d1d4c1e567ebbf4de0d25236130c8361f9aac63"),
MustHexID("883df308b0130fc928a8559fe50667a0fff80493bc09685d18213b2db241a3ad11310ed86b0ef662b3ce21fc3d9aa7f3fc24b8d9afe17c7407e9afd3345ae548"),
MustHexID("c7af968cc9bc8200c3ee1a387405f7563be1dce6710a3439f42ea40657d0eae9d2b3c16c42d779605351fcdece4da637b9804e60ca08cfb89aec32c197beffa6"),
MustHexID("3e66f2b788e3ff1d04106b80597915cd7afa06c405a7ae026556b6e583dca8e05cfbab5039bb9a1b5d06083ffe8de5780b1775550e7218f5e98624bf7af9a0a8"),
MustHexID("4fc7f53764de3337fdaec0a711d35d3a923e72fa65025444d12230b3552ed43d9b2d1ad08ccb11f2d50c58809e6dd74dde910e195294fca3b47ae5a3967cc479"),
MustHexID("bafdfdcf6ccaa989436752fa97c77477b6baa7deb374b16c095492c529eb133e8e2f99e1977012b64767b9d34b2cf6d2048ed489bd822b5139b523f6a423167b"),
MustHexID("7f5d78008a4312fe059104ce80202c82b8915c2eb4411c6b812b16f7642e57c00f2c9425121f5cbac4257fe0b3e81ef5dea97ea2dbaa98f6a8b6fd4d1e5980bb"),
MustHexID("598c37fe78f922751a052f463aeb0cb0bc7f52b7c2a4cf2da72ec0931c7c32175d4165d0f8998f7320e87324ac3311c03f9382a5385c55f0407b7a66b2acd864"),
MustHexID("f758c4136e1c148777a7f3275a76e2db0b2b04066fd738554ec398c1c6cc9fb47e14a3b4c87bd47deaeab3ffd2110514c3855685a374794daff87b605b27ee2e"),
MustHexID("0307bb9e4fd865a49dcf1fe4333d1b944547db650ab580af0b33e53c4fef6c789531110fac801bbcbce21fc4d6f61b6d5b24abdf5b22e3030646d579f6dca9c2"),
MustHexID("82504b6eb49bb2c0f91a7006ce9cefdbaf6df38706198502c2e06601091fc9dc91e4f15db3410d45c6af355bc270b0f268d3dff560f956985c7332d4b10bd1ed"),
MustHexID("b39b5b677b45944ceebe76e76d1f051de2f2a0ec7b0d650da52135743e66a9a5dba45f638258f9a7545d9a790c7fe6d3fdf82c25425c7887323e45d27d06c057"),
},
255: []NodeID{
MustHexID("5c4d58d46e055dd1f093f81ee60a675e1f02f54da6206720adee4dccef9b67a31efc5c2a2949c31a04ee31beadc79aba10da31440a1f9ff2a24093c63c36d784"),
MustHexID("ea72161ffdd4b1e124c7b93b0684805f4c4b58d617ed498b37a145c670dbc2e04976f8785583d9c805ffbf343c31d492d79f841652bbbd01b61ed85640b23495"),
MustHexID("51caa1d93352d47a8e531692a3612adac1e8ac68d0a200d086c1c57ae1e1a91aa285ab242e8c52ef9d7afe374c9485b122ae815f1707b875569d0433c1c3ce85"),
MustHexID("c08397d5751b47bd3da044b908be0fb0e510d3149574dff7aeab33749b023bb171b5769990fe17469dbebc100bc150e798aeda426a2dcc766699a225fddd75c6"),
MustHexID("0222c1c194b749736e593f937fad67ee348ac57287a15c7e42877aa38a9b87732a408bca370f812efd0eedbff13e6d5b854bf3ba1dec431a796ed47f32552b09"),
MustHexID("03d859cd46ef02d9bfad5268461a6955426845eef4126de6be0fa4e8d7e0727ba2385b78f1a883a8239e95ebb814f2af8379632c7d5b100688eebc5841209582"),
MustHexID("64d5004b7e043c39ff0bd10cb20094c287721d5251715884c280a612b494b3e9e1c64ba6f67614994c7d969a0d0c0295d107d53fc225d47c44c4b82852d6f960"),
MustHexID("b0a5eefb2dab6f786670f35bf9641eefe6dd87fd3f1362bcab4aaa792903500ab23d88fae68411372e0813b057535a601d46e454323745a948017f6063a47b1f"),
MustHexID("0cc6df0a3433d448b5684d2a3ffa9d1a825388177a18f44ad0008c7bd7702f1ec0fc38b83506f7de689c3b6ecb552599927e29699eed6bb867ff08f80068b287"),
MustHexID("50772f7b8c03a4e153355fbbf79c8a80cf32af656ff0c7873c99911099d04a0dae0674706c357e0145ad017a0ade65e6052cb1b0d574fcd6f67da3eee0ace66b"),
MustHexID("1ae37829c9ef41f8b508b82259ebac76b1ed900d7a45c08b7970f25d2d48ddd1829e2f11423a18749940b6dab8598c6e416cef0efd47e46e51f29a0bc65b37cd"),
MustHexID("ba973cab31c2af091fc1644a93527d62b2394999e2b6ccbf158dd5ab9796a43d408786f1803ef4e29debfeb62fce2b6caa5ab2b24d1549c822a11c40c2856665"),
MustHexID("bc413ad270dd6ea25bddba78f3298b03b8ba6f8608ac03d06007d4116fa78ef5a0cfe8c80155089382fc7a193243ee5500082660cb5d7793f60f2d7d18650964"),
MustHexID("5a6a9ef07634d9eec3baa87c997b529b92652afa11473dfee41ef7037d5c06e0ddb9fe842364462d79dd31cff8a59a1b8d5bc2b810dea1d4cbbd3beb80ecec83"),
MustHexID("f492c6ee2696d5f682f7f537757e52744c2ae560f1090a07024609e903d334e9e174fc01609c5a229ddbcac36c9d21adaf6457dab38a25bfd44f2f0ee4277998"),
MustHexID("459e4db99298cb0467a90acee6888b08bb857450deac11015cced5104853be5adce5b69c740968bc7f931495d671a70cad9f48546d7cd203357fe9af0e8d2164"),
},
256: []NodeID{
MustHexID("a8593af8a4aef7b806b5197612017951bac8845a1917ca9a6a15dd6086d608505144990b245785c4cd2d67a295701c7aac2aa18823fb0033987284b019656268"),
MustHexID("d2eebef914928c3aad77fc1b2a495f52d2294acf5edaa7d8a530b540f094b861a68fe8348a46a7c302f08ab609d85912a4968eacfea0740847b29421b4795d9e"),
MustHexID("b14bfcb31495f32b650b63cf7d08492e3e29071fdc73cf2da0da48d4b191a70ba1a65f42ad8c343206101f00f8a48e8db4b08bf3f622c0853e7323b250835b91"),
MustHexID("7feaee0d818c03eb30e4e0bf03ade0f3c21ca38e938a761aa1781cf70bda8cc5cd631a6cc53dd44f1d4a6d3e2dae6513c6c66ee50cb2f0e9ad6f7e319b309fd9"),
MustHexID("4ca3b657b139311db8d583c25dd5963005e46689e1317620496cc64129c7f3e52870820e0ec7941d28809311df6db8a2867bbd4f235b4248af24d7a9c22d1232"),
MustHexID("1181defb1d16851d42dd951d84424d6bd1479137f587fa184d5a8152be6b6b16ed08bcdb2c2ed8539bcde98c80c432875f9f724737c316a2bd385a39d3cab1d8"),
MustHexID("d9dd818769fa0c3ec9f553c759b92476f082817252a04a47dc1777740b1731d280058c66f982812f173a294acf4944a85ba08346e2de153ba3ba41ce8a62cb64"),
MustHexID("bd7c4f8a9e770aa915c771b15e107ca123d838762da0d3ffc53aa6b53e9cd076cffc534ec4d2e4c334c683f1f5ea72e0e123f6c261915ed5b58ac1b59f003d88"),
MustHexID("3dd5739c73649d510456a70e9d6b46a855864a4a3f744e088fd8c8da11b18e4c9b5f2d7da50b1c147b2bae5ca9609ae01f7a3cdea9dce34f80a91d29cd82f918"),
MustHexID("f0d7df1efc439b4bcc0b762118c1cfa99b2a6143a9f4b10e3c9465125f4c9fca4ab88a2504169bbcad65492cf2f50da9dd5d077c39574a944f94d8246529066b"),
MustHexID("dd598b9ba441448e5fb1a6ec6c5f5aa9605bad6e223297c729b1705d11d05f6bfd3d41988b694681ae69bb03b9a08bff4beab5596503d12a39bffb5cd6e94c7c"),
MustHexID("3fce284ac97e567aebae681b15b7a2b6df9d873945536335883e4bbc26460c064370537f323fd1ada828ea43154992d14ac0cec0940a2bd2a3f42ec156d60c83"),
MustHexID("7c8dfa8c1311cb14fb29a8ac11bca23ecc115e56d9fcf7b7ac1db9066aa4eb39f8b1dabf46e192a65be95ebfb4e839b5ab4533fef414921825e996b210dd53bd"),
MustHexID("cafa6934f82120456620573d7f801390ed5e16ed619613a37e409e44ab355ef755e83565a913b48a9466db786f8d4fbd590bfec474c2524d4a2608d4eafd6abd"),
MustHexID("9d16600d0dd310d77045769fed2cb427f32db88cd57d86e49390c2ba8a9698cfa856f775be2013237226e7bf47b248871cf865d23015937d1edeb20db5e3e760"),
MustHexID("17be6b6ba54199b1d80eff866d348ea11d8a4b341d63ad9a6681d3ef8a43853ac564d153eb2a8737f0afc9ab320f6f95c55aa11aaa13bbb1ff422fd16bdf8188"),
},
},
}
type preminedTestnet struct {
target NodeID
targetSha common.Hash // sha3(target)
dists [hashBits + 1][]NodeID
net *Network
}
func (tn *preminedTestnet) sendFindnode(to *Node, target NodeID) {
panic("sendFindnode called")
}
func (tn *preminedTestnet) sendFindnodeHash(to *Node, target common.Hash) {
// current log distance is encoded in port number
// fmt.Println("findnode query at dist", toaddr.Port)
if to.UDP == 0 {
panic("query to node at distance 0")
}
next := to.UDP - 1
var result []rpcNode
for i, id := range tn.dists[to.UDP] {
result = append(result, nodeToRPC(NewNode(id, net.ParseIP("127.0.0.1"), next, uint16(i)+1)))
}
injectResponse(tn.net, to, neighborsPacket, &neighbors{Nodes: result})
}
func (tn *preminedTestnet) sendPing(to *Node, addr *net.UDPAddr, topics []Topic) []byte {
injectResponse(tn.net, to, pongPacket, &pong{ReplyTok: []byte{1}})
return []byte{1}
}
func (tn *preminedTestnet) send(to *Node, ptype nodeEvent, data interface{}) (hash []byte) {
switch ptype {
case pingPacket:
injectResponse(tn.net, to, pongPacket, &pong{ReplyTok: []byte{1}})
case pongPacket:
// ignored
case findnodeHashPacket:
// current log distance is encoded in port number
// fmt.Println("findnode query at dist", toaddr.Port)
if to.UDP == 0 {
panic("query to node at distance 0")
}
next := to.UDP - 1
var result []rpcNode
for i, id := range tn.dists[to.UDP] {
result = append(result, nodeToRPC(NewNode(id, net.ParseIP("127.0.0.1"), next, uint16(i)+1)))
}
injectResponse(tn.net, to, neighborsPacket, &neighbors{Nodes: result})
default:
panic("send(" + ptype.String() + ")")
}
return []byte{2}
}
func (tn *preminedTestnet) sendNeighbours(to *Node, nodes []*Node) {
panic("sendNeighbours called")
}
func (tn *preminedTestnet) sendTopicQuery(to *Node, topic Topic) {
panic("sendTopicQuery called")
}
func (tn *preminedTestnet) sendTopicNodes(to *Node, queryHash common.Hash, nodes []*Node) {
panic("sendTopicNodes called")
}
func (tn *preminedTestnet) sendTopicRegister(to *Node, topics []Topic, idx int, pong []byte) {
panic("sendTopicRegister called")
}
func (*preminedTestnet) Close() {}
func (*preminedTestnet) localAddr() *net.UDPAddr { return new(net.UDPAddr) }
// mine generates a testnet struct literal with nodes at
// various distances to the given target.
func (n *preminedTestnet) mine(target NodeID) {
n.target = target
n.targetSha = crypto.Keccak256Hash(n.target[:])
found := 0
for found < bucketSize*10 {
k := newkey()
id := PubkeyID(&k.PublicKey)
sha := crypto.Keccak256Hash(id[:])
ld := logdist(n.targetSha, sha)
if len(n.dists[ld]) < bucketSize {
n.dists[ld] = append(n.dists[ld], id)
fmt.Println("found ID with ld", ld)
found++
}
}
fmt.Println("&preminedTestnet{")
fmt.Printf(" target: %#v,\n", n.target)
fmt.Printf(" targetSha: %#v,\n", n.targetSha)
fmt.Printf(" dists: [%d][]NodeID{\n", len(n.dists))
for ld, ns := range n.dists {
if len(ns) == 0 {
continue
}
fmt.Printf(" %d: []NodeID{\n", ld)
for _, n := range ns {
fmt.Printf(" MustHexID(\"%x\"),\n", n[:])
}
fmt.Println(" },")
}
fmt.Println(" },")
fmt.Println("}")
}
func injectResponse(net *Network, from *Node, ev nodeEvent, packet interface{}) {
go net.reqReadPacket(ingressPacket{remoteID: from.ID, remoteAddr: from.addr(), ev: ev, data: packet})
}

423
p2p/discv5/node.go Normal file
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@ -0,0 +1,423 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"bytes"
"crypto/ecdsa"
"crypto/elliptic"
"encoding/hex"
"errors"
"fmt"
"math/big"
"math/rand"
"net"
"net/url"
"regexp"
"strconv"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
// Node represents a host on the network.
// The public fields of Node may not be modified.
type Node struct {
IP net.IP // len 4 for IPv4 or 16 for IPv6
UDP, TCP uint16 // port numbers
ID NodeID // the node's public key
// Network-related fields are contained in nodeNetGuts.
// These fields are not supposed to be used off the
// Network.loop goroutine.
nodeNetGuts
}
// NewNode creates a new node. It is mostly meant to be used for
// testing purposes.
func NewNode(id NodeID, ip net.IP, udpPort, tcpPort uint16) *Node {
if ipv4 := ip.To4(); ipv4 != nil {
ip = ipv4
}
return &Node{
IP: ip,
UDP: udpPort,
TCP: tcpPort,
ID: id,
nodeNetGuts: nodeNetGuts{sha: crypto.Keccak256Hash(id[:])},
}
}
func (n *Node) addr() *net.UDPAddr {
return &net.UDPAddr{IP: n.IP, Port: int(n.UDP)}
}
func (n *Node) setAddr(a *net.UDPAddr) {
n.IP = a.IP
if ipv4 := a.IP.To4(); ipv4 != nil {
n.IP = ipv4
}
n.UDP = uint16(a.Port)
}
// compares the given address against the stored values.
func (n *Node) addrEqual(a *net.UDPAddr) bool {
ip := a.IP
if ipv4 := a.IP.To4(); ipv4 != nil {
ip = ipv4
}
return n.UDP == uint16(a.Port) && bytes.Equal(n.IP, ip)
}
// Incomplete returns true for nodes with no IP address.
func (n *Node) Incomplete() bool {
return n.IP == nil
}
// checks whether n is a valid complete node.
func (n *Node) validateComplete() error {
if n.Incomplete() {
return errors.New("incomplete node")
}
if n.UDP == 0 {
return errors.New("missing UDP port")
}
if n.TCP == 0 {
return errors.New("missing TCP port")
}
if n.IP.IsMulticast() || n.IP.IsUnspecified() {
return errors.New("invalid IP (multicast/unspecified)")
}
_, err := n.ID.Pubkey() // validate the key (on curve, etc.)
return err
}
// The string representation of a Node is a URL.
// Please see ParseNode for a description of the format.
func (n *Node) String() string {
u := url.URL{Scheme: "enode"}
if n.Incomplete() {
u.Host = fmt.Sprintf("%x", n.ID[:])
} else {
addr := net.TCPAddr{IP: n.IP, Port: int(n.TCP)}
u.User = url.User(fmt.Sprintf("%x", n.ID[:]))
u.Host = addr.String()
if n.UDP != n.TCP {
u.RawQuery = "discport=" + strconv.Itoa(int(n.UDP))
}
}
return u.String()
}
var incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
// ParseNode parses a node designator.
//
// There are two basic forms of node designators
// - incomplete nodes, which only have the public key (node ID)
// - complete nodes, which contain the public key and IP/Port information
//
// For incomplete nodes, the designator must look like one of these
//
// enode://<hex node id>
// <hex node id>
//
// For complete nodes, the node ID is encoded in the username portion
// of the URL, separated from the host by an @ sign. The hostname can
// only be given as an IP address, DNS domain names are not allowed.
// The port in the host name section is the TCP listening port. If the
// TCP and UDP (discovery) ports differ, the UDP port is specified as
// query parameter "discport".
//
// In the following example, the node URL describes
// a node with IP address 10.3.58.6, TCP listening port 30303
// and UDP discovery port 30301.
//
// enode://<hex node id>@10.3.58.6:30303?discport=30301
func ParseNode(rawurl string) (*Node, error) {
if m := incompleteNodeURL.FindStringSubmatch(rawurl); m != nil {
id, err := HexID(m[1])
if err != nil {
return nil, fmt.Errorf("invalid node ID (%v)", err)
}
return NewNode(id, nil, 0, 0), nil
}
return parseComplete(rawurl)
}
func parseComplete(rawurl string) (*Node, error) {
var (
id NodeID
ip net.IP
tcpPort, udpPort uint64
)
u, err := url.Parse(rawurl)
if err != nil {
return nil, err
}
if u.Scheme != "enode" {
return nil, errors.New("invalid URL scheme, want \"enode\"")
}
// Parse the Node ID from the user portion.
if u.User == nil {
return nil, errors.New("does not contain node ID")
}
if id, err = HexID(u.User.String()); err != nil {
return nil, fmt.Errorf("invalid node ID (%v)", err)
}
// Parse the IP address.
host, port, err := net.SplitHostPort(u.Host)
if err != nil {
return nil, fmt.Errorf("invalid host: %v", err)
}
if ip = net.ParseIP(host); ip == nil {
return nil, errors.New("invalid IP address")
}
// Ensure the IP is 4 bytes long for IPv4 addresses.
if ipv4 := ip.To4(); ipv4 != nil {
ip = ipv4
}
// Parse the port numbers.
if tcpPort, err = strconv.ParseUint(port, 10, 16); err != nil {
return nil, errors.New("invalid port")
}
udpPort = tcpPort
qv := u.Query()
if qv.Get("discport") != "" {
udpPort, err = strconv.ParseUint(qv.Get("discport"), 10, 16)
if err != nil {
return nil, errors.New("invalid discport in query")
}
}
return NewNode(id, ip, uint16(udpPort), uint16(tcpPort)), nil
}
// MustParseNode parses a node URL. It panics if the URL is not valid.
func MustParseNode(rawurl string) *Node {
n, err := ParseNode(rawurl)
if err != nil {
panic("invalid node URL: " + err.Error())
}
return n
}
// type nodeQueue []*Node
//
// // pushNew adds n to the end if it is not present.
// func (nl *nodeList) appendNew(n *Node) {
// for _, entry := range n {
// if entry == n {
// return
// }
// }
// *nq = append(*nq, n)
// }
//
// // popRandom removes a random node. Nodes closer to
// // to the head of the beginning of the have a slightly higher probability.
// func (nl *nodeList) popRandom() *Node {
// ix := rand.Intn(len(*nq))
// //TODO: probability as mentioned above.
// nl.removeIndex(ix)
// }
//
// func (nl *nodeList) removeIndex(i int) *Node {
// slice = *nl
// if len(*slice) <= i {
// return nil
// }
// *nl = append(slice[:i], slice[i+1:]...)
// }
const nodeIDBits = 512
// NodeID is a unique identifier for each node.
// The node identifier is a marshaled elliptic curve public key.
type NodeID [nodeIDBits / 8]byte
// NodeID prints as a long hexadecimal number.
func (n NodeID) String() string {
return fmt.Sprintf("%x", n[:])
}
// The Go syntax representation of a NodeID is a call to HexID.
func (n NodeID) GoString() string {
return fmt.Sprintf("discover.HexID(\"%x\")", n[:])
}
// HexID converts a hex string to a NodeID.
// The string may be prefixed with 0x.
func HexID(in string) (NodeID, error) {
if strings.HasPrefix(in, "0x") {
in = in[2:]
}
var id NodeID
b, err := hex.DecodeString(in)
if err != nil {
return id, err
} else if len(b) != len(id) {
return id, fmt.Errorf("wrong length, want %d hex chars", len(id)*2)
}
copy(id[:], b)
return id, nil
}
// MustHexID converts a hex string to a NodeID.
// It panics if the string is not a valid NodeID.
func MustHexID(in string) NodeID {
id, err := HexID(in)
if err != nil {
panic(err)
}
return id
}
// PubkeyID returns a marshaled representation of the given public key.
func PubkeyID(pub *ecdsa.PublicKey) NodeID {
var id NodeID
pbytes := elliptic.Marshal(pub.Curve, pub.X, pub.Y)
if len(pbytes)-1 != len(id) {
panic(fmt.Errorf("need %d bit pubkey, got %d bits", (len(id)+1)*8, len(pbytes)))
}
copy(id[:], pbytes[1:])
return id
}
// Pubkey returns the public key represented by the node ID.
// It returns an error if the ID is not a point on the curve.
func (id NodeID) Pubkey() (*ecdsa.PublicKey, error) {
p := &ecdsa.PublicKey{Curve: S256(), X: new(big.Int), Y: new(big.Int)}
half := len(id) / 2
p.X.SetBytes(id[:half])
p.Y.SetBytes(id[half:])
if !p.Curve.IsOnCurve(p.X, p.Y) {
return nil, errors.New("id is invalid secp256k1 curve point")
}
return p, nil
}
func (id NodeID) mustPubkey() ecdsa.PublicKey {
pk, err := id.Pubkey()
if err != nil {
panic(err)
}
return *pk
}
// recoverNodeID computes the public key used to sign the
// given hash from the signature.
func recoverNodeID(hash, sig []byte) (id NodeID, err error) {
pubkey, err := crypto.Ecrecover(hash, sig)
if err != nil {
return id, err
}
if len(pubkey)-1 != len(id) {
return id, fmt.Errorf("recovered pubkey has %d bits, want %d bits", len(pubkey)*8, (len(id)+1)*8)
}
for i := range id {
id[i] = pubkey[i+1]
}
return id, nil
}
// distcmp compares the distances a->target and b->target.
// Returns -1 if a is closer to target, 1 if b is closer to target
// and 0 if they are equal.
func distcmp(target, a, b common.Hash) int {
for i := range target {
da := a[i] ^ target[i]
db := b[i] ^ target[i]
if da > db {
return 1
} else if da < db {
return -1
}
}
return 0
}
// table of leading zero counts for bytes [0..255]
var lzcount = [256]int{
8, 7, 6, 6, 5, 5, 5, 5,
4, 4, 4, 4, 4, 4, 4, 4,
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2,
2, 2, 2, 2, 2, 2, 2, 2,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
1, 1, 1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
}
// logdist returns the logarithmic distance between a and b, log2(a ^ b).
func logdist(a, b common.Hash) int {
lz := 0
for i := range a {
x := a[i] ^ b[i]
if x == 0 {
lz += 8
} else {
lz += lzcount[x]
break
}
}
return len(a)*8 - lz
}
// hashAtDistance returns a random hash such that logdist(a, b) == n
func hashAtDistance(a common.Hash, n int) (b common.Hash) {
if n == 0 {
return a
}
// flip bit at position n, fill the rest with random bits
b = a
pos := len(a) - n/8 - 1
bit := byte(0x01) << (byte(n%8) - 1)
if bit == 0 {
pos++
bit = 0x80
}
b[pos] = a[pos]&^bit | ^a[pos]&bit // TODO: randomize end bits
for i := pos + 1; i < len(a); i++ {
b[i] = byte(rand.Intn(255))
}
return b
}

305
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@ -0,0 +1,305 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"fmt"
"math/big"
"math/rand"
"net"
"reflect"
"strings"
"testing"
"testing/quick"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
func ExampleNewNode() {
id := MustHexID("1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439")
// Complete nodes contain UDP and TCP endpoints:
n1 := NewNode(id, net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 52150, 30303)
fmt.Println("n1:", n1)
fmt.Println("n1.Incomplete() ->", n1.Incomplete())
// An incomplete node can be created by passing zero values
// for all parameters except id.
n2 := NewNode(id, nil, 0, 0)
fmt.Println("n2:", n2)
fmt.Println("n2.Incomplete() ->", n2.Incomplete())
// Output:
// n1: enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15::abcd:ef12]:30303?discport=52150
// n1.Incomplete() -> false
// n2: enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439
// n2.Incomplete() -> true
}
var parseNodeTests = []struct {
rawurl string
wantError string
wantResult *Node
}{
{
rawurl: "http://foobar",
wantError: `invalid URL scheme, want "enode"`,
},
{
rawurl: "enode://01010101@123.124.125.126:3",
wantError: `invalid node ID (wrong length, want 128 hex chars)`,
},
// Complete nodes with IP address.
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@hostname:3",
wantError: `invalid IP address`,
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:foo",
wantError: `invalid port`,
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:3?discport=foo",
wantError: `invalid discport in query`,
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{0x7f, 0x0, 0x0, 0x1},
52150,
52150,
),
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[::]:52150",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.ParseIP("::"),
52150,
52150,
),
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15::abcd:ef12]:52150",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
52150,
52150,
),
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150?discport=22334",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
net.IP{0x7f, 0x0, 0x0, 0x1},
22334,
52150,
),
},
// Incomplete nodes with no address.
{
rawurl: "1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
nil, 0, 0,
),
},
{
rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439",
wantResult: NewNode(
MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
nil, 0, 0,
),
},
// Invalid URLs
{
rawurl: "01010101",
wantError: `invalid node ID (wrong length, want 128 hex chars)`,
},
{
rawurl: "enode://01010101",
wantError: `invalid node ID (wrong length, want 128 hex chars)`,
},
{
// This test checks that errors from url.Parse are handled.
rawurl: "://foo",
wantError: `parse ://foo: missing protocol scheme`,
},
}
func TestParseNode(t *testing.T) {
for _, test := range parseNodeTests {
n, err := ParseNode(test.rawurl)
if test.wantError != "" {
if err == nil {
t.Errorf("test %q:\n got nil error, expected %#q", test.rawurl, test.wantError)
continue
} else if err.Error() != test.wantError {
t.Errorf("test %q:\n got error %#q, expected %#q", test.rawurl, err.Error(), test.wantError)
continue
}
} else {
if err != nil {
t.Errorf("test %q:\n unexpected error: %v", test.rawurl, err)
continue
}
if !reflect.DeepEqual(n, test.wantResult) {
t.Errorf("test %q:\n result mismatch:\ngot: %#v, want: %#v", test.rawurl, n, test.wantResult)
}
}
}
}
func TestNodeString(t *testing.T) {
for i, test := range parseNodeTests {
if test.wantError == "" && strings.HasPrefix(test.rawurl, "enode://") {
str := test.wantResult.String()
if str != test.rawurl {
t.Errorf("test %d: Node.String() mismatch:\ngot: %s\nwant: %s", i, str, test.rawurl)
}
}
}
}
func TestHexID(t *testing.T) {
ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
id1 := MustHexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
id2 := MustHexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
if id1 != ref {
t.Errorf("wrong id1\ngot %v\nwant %v", id1[:], ref[:])
}
if id2 != ref {
t.Errorf("wrong id2\ngot %v\nwant %v", id2[:], ref[:])
}
}
func TestNodeID_recover(t *testing.T) {
prv := newkey()
hash := make([]byte, 32)
sig, err := crypto.Sign(hash, prv)
if err != nil {
t.Fatalf("signing error: %v", err)
}
pub := PubkeyID(&prv.PublicKey)
recpub, err := recoverNodeID(hash, sig)
if err != nil {
t.Fatalf("recovery error: %v", err)
}
if pub != recpub {
t.Errorf("recovered wrong pubkey:\ngot: %v\nwant: %v", recpub, pub)
}
ecdsa, err := pub.Pubkey()
if err != nil {
t.Errorf("Pubkey error: %v", err)
}
if !reflect.DeepEqual(ecdsa, &prv.PublicKey) {
t.Errorf("Pubkey mismatch:\n got: %#v\n want: %#v", ecdsa, &prv.PublicKey)
}
}
func TestNodeID_pubkeyBad(t *testing.T) {
ecdsa, err := NodeID{}.Pubkey()
if err == nil {
t.Error("expected error for zero ID")
}
if ecdsa != nil {
t.Error("expected nil result")
}
}
func TestNodeID_distcmp(t *testing.T) {
distcmpBig := func(target, a, b common.Hash) int {
tbig := new(big.Int).SetBytes(target[:])
abig := new(big.Int).SetBytes(a[:])
bbig := new(big.Int).SetBytes(b[:])
return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
}
if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg()); err != nil {
t.Error(err)
}
}
// the random tests is likely to miss the case where they're equal.
func TestNodeID_distcmpEqual(t *testing.T) {
base := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
x := common.Hash{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
if distcmp(base, x, x) != 0 {
t.Errorf("distcmp(base, x, x) != 0")
}
}
func TestNodeID_logdist(t *testing.T) {
logdistBig := func(a, b common.Hash) int {
abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
return new(big.Int).Xor(abig, bbig).BitLen()
}
if err := quick.CheckEqual(logdist, logdistBig, quickcfg()); err != nil {
t.Error(err)
}
}
// the random tests is likely to miss the case where they're equal.
func TestNodeID_logdistEqual(t *testing.T) {
x := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
if logdist(x, x) != 0 {
t.Errorf("logdist(x, x) != 0")
}
}
func TestNodeID_hashAtDistance(t *testing.T) {
// we don't use quick.Check here because its output isn't
// very helpful when the test fails.
cfg := quickcfg()
for i := 0; i < cfg.MaxCount; i++ {
a := gen(common.Hash{}, cfg.Rand).(common.Hash)
dist := cfg.Rand.Intn(len(common.Hash{}) * 8)
result := hashAtDistance(a, dist)
actualdist := logdist(result, a)
if dist != actualdist {
t.Log("a: ", a)
t.Log("result:", result)
t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
}
}
}
func quickcfg() *quick.Config {
return &quick.Config{
MaxCount: 5000,
Rand: rand.New(rand.NewSource(time.Now().Unix())),
}
}
// TODO: The Generate method can be dropped when we require Go >= 1.5
// because testing/quick learned to generate arrays in 1.5.
func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
var id NodeID
m := rand.Intn(len(id))
for i := len(id) - 1; i > m; i-- {
id[i] = byte(rand.Uint32())
}
return reflect.ValueOf(id)
}

27
p2p/discv5/nodeevent_string.go Normal file
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// Code generated by "stringer -type nodeEvent"; DO NOT EDIT
package discv5
import "fmt"
const (
_nodeEvent_name_0 = "invalidEventpingPacketpongPacketfindnodePacketneighborsPacketfindnodeHashPackettopicRegisterPackettopicQueryPackettopicNodesPacket"
_nodeEvent_name_1 = "pongTimeoutpingTimeoutneighboursTimeout"
)
var (
_nodeEvent_index_0 = [...]uint8{0, 12, 22, 32, 46, 61, 79, 98, 114, 130}
_nodeEvent_index_1 = [...]uint8{0, 11, 22, 39}
)
func (i nodeEvent) String() string {
switch {
case 0 <= i && i <= 8:
return _nodeEvent_name_0[_nodeEvent_index_0[i]:_nodeEvent_index_0[i+1]]
case 265 <= i && i <= 267:
i -= 265
return _nodeEvent_name_1[_nodeEvent_index_1[i]:_nodeEvent_index_1[i+1]]
default:
return fmt.Sprintf("nodeEvent(%d)", i)
}
}

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Contains the NTP time drift detection via the SNTP protocol:
// https://tools.ietf.org/html/rfc4330
package discv5
import (
"fmt"
"net"
"sort"
"strings"
"time"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
)
const (
ntpPool = "pool.ntp.org" // ntpPool is the NTP server to query for the current time
ntpChecks = 3 // Number of measurements to do against the NTP server
)
// durationSlice attaches the methods of sort.Interface to []time.Duration,
// sorting in increasing order.
type durationSlice []time.Duration
func (s durationSlice) Len() int { return len(s) }
func (s durationSlice) Less(i, j int) bool { return s[i] < s[j] }
func (s durationSlice) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
// checkClockDrift queries an NTP server for clock drifts and warns the user if
// one large enough is detected.
func checkClockDrift() {
drift, err := sntpDrift(ntpChecks)
if err != nil {
return
}
if drift < -driftThreshold || drift > driftThreshold {
warning := fmt.Sprintf("System clock seems off by %v, which can prevent network connectivity", drift)
howtofix := fmt.Sprintf("Please enable network time synchronisation in system settings")
separator := strings.Repeat("-", len(warning))
glog.V(logger.Warn).Info(separator)
glog.V(logger.Warn).Info(warning)
glog.V(logger.Warn).Info(howtofix)
glog.V(logger.Warn).Info(separator)
} else {
glog.V(logger.Debug).Infof("Sanity NTP check reported %v drift, all ok", drift)
}
}
// sntpDrift does a naive time resolution against an NTP server and returns the
// measured drift. This method uses the simple version of NTP. It's not precise
// but should be fine for these purposes.
//
// Note, it executes two extra measurements compared to the number of requested
// ones to be able to discard the two extremes as outliers.
func sntpDrift(measurements int) (time.Duration, error) {
// Resolve the address of the NTP server
addr, err := net.ResolveUDPAddr("udp", ntpPool+":123")
if err != nil {
return 0, err
}
// Construct the time request (empty package with only 2 fields set):
// Bits 3-5: Protocol version, 3
// Bits 6-8: Mode of operation, client, 3
request := make([]byte, 48)
request[0] = 3<<3 | 3
// Execute each of the measurements
drifts := []time.Duration{}
for i := 0; i < measurements+2; i++ {
// Dial the NTP server and send the time retrieval request
conn, err := net.DialUDP("udp", nil, addr)
if err != nil {
return 0, err
}
defer conn.Close()
sent := time.Now()
if _, err = conn.Write(request); err != nil {
return 0, err
}
// Retrieve the reply and calculate the elapsed time
conn.SetDeadline(time.Now().Add(5 * time.Second))
reply := make([]byte, 48)
if _, err = conn.Read(reply); err != nil {
return 0, err
}
elapsed := time.Since(sent)
// Reconstruct the time from the reply data
sec := uint64(reply[43]) | uint64(reply[42])<<8 | uint64(reply[41])<<16 | uint64(reply[40])<<24
frac := uint64(reply[47]) | uint64(reply[46])<<8 | uint64(reply[45])<<16 | uint64(reply[44])<<24
nanosec := sec*1e9 + (frac*1e9)>>32
t := time.Date(1900, 1, 1, 0, 0, 0, 0, time.UTC).Add(time.Duration(nanosec)).Local()
// Calculate the drift based on an assumed answer time of RRT/2
drifts = append(drifts, sent.Sub(t)+elapsed/2)
}
// Calculate average drif (drop two extremities to avoid outliers)
sort.Sort(durationSlice(drifts))
drift := time.Duration(0)
for i := 1; i < len(drifts)-1; i++ {
drift += drifts[i]
}
return drift / time.Duration(measurements), nil
}

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"bufio"
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
"os"
"os/exec"
"runtime"
"strings"
"testing"
)
func getnacl() (string, error) {
switch runtime.GOARCH {
case "amd64":
_, err := exec.LookPath("sel_ldr_x86_64")
return "amd64p32", err
case "i386":
_, err := exec.LookPath("sel_ldr_i386")
return "i386", err
default:
return "", errors.New("nacl is not supported on " + runtime.GOARCH)
}
}
// runWithPlaygroundTime executes the caller
// in the NaCl sandbox with faketime enabled.
//
// This function must be called from a Test* function
// and the caller must skip the actual test when isHost is true.
func runWithPlaygroundTime(t *testing.T) (isHost bool) {
if runtime.GOOS == "nacl" {
return false
}
// Get the caller.
callerPC, _, _, ok := runtime.Caller(1)
if !ok {
panic("can't get caller")
}
callerFunc := runtime.FuncForPC(callerPC)
if callerFunc == nil {
panic("can't get caller")
}
callerName := callerFunc.Name()[strings.LastIndexByte(callerFunc.Name(), '.')+1:]
if !strings.HasPrefix(callerName, "Test") {
panic("must be called from witin a Test* function")
}
testPattern := "^" + callerName + "$"
// Unfortunately runtime.faketime (playground time mode) only works on NaCl. The NaCl
// SDK must be installed and linked into PATH for this to work.
arch, err := getnacl()
if err != nil {
t.Skip(err)
}
// Compile and run the calling test using NaCl.
// The extra tag ensures that the TestMain function in sim_main_test.go is used.
cmd := exec.Command("go", "test", "-v", "-tags", "faketime_simulation", "-timeout", "100h", "-run", testPattern, ".")
cmd.Env = append([]string{"GOOS=nacl", "GOARCH=" + arch}, os.Environ()...)
stdout, _ := cmd.StdoutPipe()
stderr, _ := cmd.StderrPipe()
go skipPlaygroundOutputHeaders(os.Stdout, stdout)
go skipPlaygroundOutputHeaders(os.Stderr, stderr)
if err := cmd.Run(); err != nil {
t.Error(err)
}
// Ensure that the test function doesn't run in the (non-NaCl) host process.
return true
}
func skipPlaygroundOutputHeaders(out io.Writer, in io.Reader) {
// Additional output can be printed without the headers
// before the NaCl binary starts running (e.g. compiler error messages).
bufin := bufio.NewReader(in)
output, err := bufin.ReadBytes(0)
output = bytes.TrimSuffix(output, []byte{0})
if len(output) > 0 {
out.Write(output)
}
if err != nil {
return
}
bufin.UnreadByte()
// Playback header: 0 0 P B <8-byte time> <4-byte data length>
head := make([]byte, 4+8+4)
for {
if _, err := io.ReadFull(bufin, head); err != nil {
if err != io.EOF {
fmt.Fprintln(out, "read error:", err)
}
return
}
if !bytes.HasPrefix(head, []byte{0x00, 0x00, 'P', 'B'}) {
fmt.Fprintf(out, "expected playback header, got %q\n", head)
io.Copy(out, bufin)
return
}
// Copy data until next header.
size := binary.BigEndian.Uint32(head[12:])
io.CopyN(out, bufin, int64(size))
}
}

464
p2p/discv5/sim_test.go Normal file
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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"crypto/ecdsa"
"encoding/binary"
"fmt"
"math/rand"
"net"
"strconv"
"sync"
"sync/atomic"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
)
// In this test, nodes try to randomly resolve each other.
func TestSimRandomResolve(t *testing.T) {
t.Skip("boring")
if runWithPlaygroundTime(t) {
return
}
sim := newSimulation()
bootnode := sim.launchNode(false)
// A new node joins every 10s.
launcher := time.NewTicker(10 * time.Second)
go func() {
for range launcher.C {
net := sim.launchNode(false)
go randomResolves(t, sim, net)
if err := net.SetFallbackNodes([]*Node{bootnode.Self()}); err != nil {
panic(err)
}
fmt.Printf("launched @ %v: %x\n", time.Now(), net.Self().ID[:16])
}
}()
time.Sleep(3 * time.Hour)
launcher.Stop()
sim.shutdown()
sim.printStats()
}
func TestSimTopics(t *testing.T) {
t.Skip("NaCl test")
if runWithPlaygroundTime(t) {
return
}
// glog.SetV(6)
// glog.SetToStderr(true)
sim := newSimulation()
bootnode := sim.launchNode(false)
go func() {
nets := make([]*Network, 1024)
for i, _ := range nets {
net := sim.launchNode(false)
nets[i] = net
if err := net.SetFallbackNodes([]*Node{bootnode.Self()}); err != nil {
panic(err)
}
time.Sleep(time.Second * 5)
}
for i, net := range nets {
if i < 256 {
stop := make(chan struct{})
go net.RegisterTopic(testTopic, stop)
go func() {
//time.Sleep(time.Second * 36000)
time.Sleep(time.Second * 40000)
close(stop)
}()
time.Sleep(time.Millisecond * 100)
}
// time.Sleep(time.Second * 10)
//time.Sleep(time.Second)
/*if i%500 == 499 {
time.Sleep(time.Second * 9501)
} else {
time.Sleep(time.Second)
}*/
}
}()
// A new node joins every 10s.
/* launcher := time.NewTicker(5 * time.Second)
cnt := 0
var printNet *Network
go func() {
for range launcher.C {
cnt++
if cnt <= 1000 {
log := false //(cnt == 500)
net := sim.launchNode(log)
if log {
printNet = net
}
if cnt > 500 {
go net.RegisterTopic(testTopic, nil)
}
if err := net.SetFallbackNodes([]*Node{bootnode.Self()}); err != nil {
panic(err)
}
}
//fmt.Printf("launched @ %v: %x\n", time.Now(), net.Self().ID[:16])
}
}()
*/
time.Sleep(55000 * time.Second)
//launcher.Stop()
sim.shutdown()
//sim.printStats()
//printNet.log.printLogs()
}
/*func testHierarchicalTopics(i int) []Topic {
digits := strconv.FormatInt(int64(256+i/4), 4)
res := make([]Topic, 5)
for i, _ := range res {
res[i] = Topic("foo" + digits[1:i+1])
}
return res
}*/
func testHierarchicalTopics(i int) []Topic {
digits := strconv.FormatInt(int64(128+i/8), 2)
res := make([]Topic, 8)
for i, _ := range res {
res[i] = Topic("foo" + digits[1:i+1])
}
return res
}
func TestSimTopicHierarchy(t *testing.T) {
t.Skip("NaCl test")
if runWithPlaygroundTime(t) {
return
}
// glog.SetV(6)
// glog.SetToStderr(true)
sim := newSimulation()
bootnode := sim.launchNode(false)
go func() {
nets := make([]*Network, 1024)
for i, _ := range nets {
net := sim.launchNode(false)
nets[i] = net
if err := net.SetFallbackNodes([]*Node{bootnode.Self()}); err != nil {
panic(err)
}
time.Sleep(time.Second * 5)
}
stop := make(chan struct{})
for i, net := range nets {
//if i < 256 {
for _, topic := range testHierarchicalTopics(i)[:5] {
//fmt.Println("reg", topic)
go net.RegisterTopic(topic, stop)
}
time.Sleep(time.Millisecond * 100)
//}
}
time.Sleep(time.Second * 90000)
close(stop)
}()
time.Sleep(100000 * time.Second)
sim.shutdown()
}
func randomResolves(t *testing.T, s *simulation, net *Network) {
randtime := func() time.Duration {
return time.Duration(rand.Intn(50)+20) * time.Second
}
lookup := func(target NodeID) bool {
result := net.Resolve(target)
return result != nil && result.ID == target
}
timer := time.NewTimer(randtime())
for {
select {
case <-timer.C:
target := s.randomNode().Self().ID
if !lookup(target) {
t.Errorf("node %x: target %x not found", net.Self().ID[:8], target[:8])
}
timer.Reset(randtime())
case <-net.closed:
return
}
}
}
type simulation struct {
mu sync.RWMutex
nodes map[NodeID]*Network
nodectr uint32
}
func newSimulation() *simulation {
return &simulation{nodes: make(map[NodeID]*Network)}
}
func (s *simulation) shutdown() {
s.mu.RLock()
alive := make([]*Network, 0, len(s.nodes))
for _, n := range s.nodes {
alive = append(alive, n)
}
defer s.mu.RUnlock()
for _, n := range alive {
n.Close()
}
}
func (s *simulation) printStats() {
s.mu.Lock()
defer s.mu.Unlock()
fmt.Println("node counter:", s.nodectr)
fmt.Println("alive nodes:", len(s.nodes))
// for _, n := range s.nodes {
// fmt.Printf("%x\n", n.tab.self.ID[:8])
// transport := n.conn.(*simTransport)
// fmt.Println(" joined:", transport.joinTime)
// fmt.Println(" sends:", transport.hashctr)
// fmt.Println(" table size:", n.tab.count)
// }
/*for _, n := range s.nodes {
fmt.Println()
fmt.Printf("*** Node %x\n", n.tab.self.ID[:8])
n.log.printLogs()
}*/
}
func (s *simulation) randomNode() *Network {
s.mu.Lock()
defer s.mu.Unlock()
n := rand.Intn(len(s.nodes))
for _, net := range s.nodes {
if n == 0 {
return net
}
n--
}
return nil
}
func (s *simulation) launchNode(log bool) *Network {
var (
num = s.nodectr
key = newkey()
id = PubkeyID(&key.PublicKey)
ip = make(net.IP, 4)
)
s.nodectr++
binary.BigEndian.PutUint32(ip, num)
ip[0] = 10
addr := &net.UDPAddr{IP: ip, Port: 30303}
transport := &simTransport{joinTime: time.Now(), sender: id, senderAddr: addr, sim: s, priv: key}
net, err := newNetwork(transport, key.PublicKey, nil, "<no database>")
if err != nil {
panic("cannot launch new node: " + err.Error())
}
s.mu.Lock()
s.nodes[id] = net
s.mu.Unlock()
return net
}
func (s *simulation) dropNode(id NodeID) {
s.mu.Lock()
n := s.nodes[id]
delete(s.nodes, id)
s.mu.Unlock()
n.Close()
}
type simTransport struct {
joinTime time.Time
sender NodeID
senderAddr *net.UDPAddr
sim *simulation
hashctr uint64
priv *ecdsa.PrivateKey
}
func (st *simTransport) localAddr() *net.UDPAddr {
return st.senderAddr
}
func (st *simTransport) Close() {}
func (st *simTransport) send(remote *Node, ptype nodeEvent, data interface{}) (hash []byte) {
hash = st.nextHash()
var raw []byte
if ptype == pongPacket {
var err error
raw, _, err = encodePacket(st.priv, byte(ptype), data)
if err != nil {
panic(err)
}
}
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: hash,
ev: ptype,
data: data,
rawData: raw,
})
return hash
}
func (st *simTransport) sendPing(remote *Node, remoteAddr *net.UDPAddr, topics []Topic) []byte {
hash := st.nextHash()
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: hash,
ev: pingPacket,
data: &ping{
Version: 4,
From: rpcEndpoint{IP: st.senderAddr.IP, UDP: uint16(st.senderAddr.Port), TCP: 30303},
To: rpcEndpoint{IP: remoteAddr.IP, UDP: uint16(remoteAddr.Port), TCP: 30303},
Expiration: uint64(time.Now().Unix() + int64(expiration)),
Topics: topics,
},
})
return hash
}
func (st *simTransport) sendPong(remote *Node, pingHash []byte) {
raddr := remote.addr()
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: st.nextHash(),
ev: pongPacket,
data: &pong{
To: rpcEndpoint{IP: raddr.IP, UDP: uint16(raddr.Port), TCP: 30303},
ReplyTok: pingHash,
Expiration: uint64(time.Now().Unix() + int64(expiration)),
},
})
}
func (st *simTransport) sendFindnodeHash(remote *Node, target common.Hash) {
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: st.nextHash(),
ev: findnodeHashPacket,
data: &findnodeHash{
Target: target,
Expiration: uint64(time.Now().Unix() + int64(expiration)),
},
})
}
func (st *simTransport) sendTopicRegister(remote *Node, topics []Topic, idx int, pong []byte) {
//fmt.Println("send", topics, pong)
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: st.nextHash(),
ev: topicRegisterPacket,
data: &topicRegister{
Topics: topics,
Idx: uint(idx),
Pong: pong,
},
})
}
func (st *simTransport) sendTopicNodes(remote *Node, queryHash common.Hash, nodes []*Node) {
rnodes := make([]rpcNode, len(nodes))
for i := range nodes {
rnodes[i] = nodeToRPC(nodes[i])
}
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: st.nextHash(),
ev: topicNodesPacket,
data: &topicNodes{Echo: queryHash, Nodes: rnodes},
})
}
func (st *simTransport) sendNeighbours(remote *Node, nodes []*Node) {
// TODO: send multiple packets
rnodes := make([]rpcNode, len(nodes))
for i := range nodes {
rnodes[i] = nodeToRPC(nodes[i])
}
st.sendPacket(remote.ID, ingressPacket{
remoteID: st.sender,
remoteAddr: st.senderAddr,
hash: st.nextHash(),
ev: neighborsPacket,
data: &neighbors{
Nodes: rnodes,
Expiration: uint64(time.Now().Unix() + int64(expiration)),
},
})
}
func (st *simTransport) nextHash() []byte {
v := atomic.AddUint64(&st.hashctr, 1)
var hash common.Hash
binary.BigEndian.PutUint64(hash[:], v)
return hash[:]
}
const packetLoss = 0 // 1/1000
func (st *simTransport) sendPacket(remote NodeID, p ingressPacket) {
if rand.Int31n(1000) >= packetLoss {
st.sim.mu.RLock()
recipient := st.sim.nodes[remote]
st.sim.mu.RUnlock()
time.AfterFunc(200*time.Millisecond, func() {
recipient.reqReadPacket(p)
})
}
}

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// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// +build go1.4,nacl,faketime_simulation
package discv5
import (
"os"
"runtime"
"testing"
"unsafe"
)
// Enable fake time mode in the runtime, like on the go playground.
// There is a slight chance that this won't work because some go code
// might have executed before the variable is set.
//go:linkname faketime runtime.faketime
var faketime = 1
func TestMain(m *testing.M) {
// We need to use unsafe somehow in order to get access to go:linkname.
_ = unsafe.Sizeof(0)
// Run the actual test. runWithPlaygroundTime ensures that the only test
// that runs is the one calling it.
runtime.GOMAXPROCS(8)
os.Exit(m.Run())
}

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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package discv5 implements the RLPx v5 Topic Discovery Protocol.
//
// The Topic Discovery protocol provides a way to find RLPx nodes that
// can be connected to. It uses a Kademlia-like protocol to maintain a
// distributed database of the IDs and endpoints of all listening
// nodes.
package discv5
import (
"crypto/rand"
"encoding/binary"
"net"
"sort"
"github.com/ethereum/go-ethereum/common"
)
const (
alpha = 3 // Kademlia concurrency factor
bucketSize = 16 // Kademlia bucket size
hashBits = len(common.Hash{}) * 8
nBuckets = hashBits + 1 // Number of buckets
maxBondingPingPongs = 16
maxFindnodeFailures = 5
)
type Table struct {
count int // number of nodes
buckets [nBuckets]*bucket // index of known nodes by distance
nodeAddedHook func(*Node) // for testing
self *Node // metadata of the local node
}
// bucket contains nodes, ordered by their last activity. the entry
// that was most recently active is the first element in entries.
type bucket struct {
entries []*Node
replacements []*Node
}
func newTable(ourID NodeID, ourAddr *net.UDPAddr) *Table {
self := NewNode(ourID, ourAddr.IP, uint16(ourAddr.Port), uint16(ourAddr.Port))
tab := &Table{self: self}
for i := range tab.buckets {
tab.buckets[i] = new(bucket)
}
return tab
}
func (tab *Table) chooseBucketFillTarget() common.Hash {
bucketCount := nBuckets
for bucketCount > 0 && len(tab.buckets[nBuckets-bucketCount].entries) == 0 {
bucketCount--
}
var bucket int
for {
// select a target hash that could go into a certain randomly selected bucket
// buckets are chosen with an even chance out of the existing ones that contain
// less that bucketSize entries, plus a potential new one beyond these
bucket = nBuckets - 1 - int(randUint(uint32(bucketCount+1)))
if bucket == bucketCount || len(tab.buckets[bucket].entries) < bucketSize {
break
}
}
// calculate target that has the desired log distance from our own address hash
target := tab.self.sha.Bytes()
prefix := binary.BigEndian.Uint64(target[0:8])
shift := uint(nBuckets - 1 - bucket)
if bucket != bucketCount {
shift++
}
var b [8]byte
rand.Read(b[:])
rnd := binary.BigEndian.Uint64(b[:])
rndMask := (^uint64(0)) >> shift
addrMask := ^rndMask
xorMask := uint64(0)
if bucket != bucketCount {
xorMask = rndMask + 1
}
prefix = (prefix&addrMask ^ xorMask) | (rnd & rndMask)
binary.BigEndian.PutUint64(target[0:8], prefix)
rand.Read(target[8:])
return common.BytesToHash(target)
}
// readRandomNodes fills the given slice with random nodes from the
// table. It will not write the same node more than once. The nodes in
// the slice are copies and can be modified by the caller.
func (tab *Table) readRandomNodes(buf []*Node) (n int) {
// TODO: tree-based buckets would help here
// Find all non-empty buckets and get a fresh slice of their entries.
var buckets [][]*Node
for _, b := range tab.buckets {
if len(b.entries) > 0 {
buckets = append(buckets, b.entries[:])
}
}
if len(buckets) == 0 {
return 0
}
// Shuffle the buckets.
for i := uint32(len(buckets)) - 1; i > 0; i-- {
j := randUint(i)
buckets[i], buckets[j] = buckets[j], buckets[i]
}
// Move head of each bucket into buf, removing buckets that become empty.
var i, j int
for ; i < len(buf); i, j = i+1, (j+1)%len(buckets) {
b := buckets[j]
buf[i] = &(*b[0])
buckets[j] = b[1:]
if len(b) == 1 {
buckets = append(buckets[:j], buckets[j+1:]...)
}
if len(buckets) == 0 {
break
}
}
return i + 1
}
func randUint(max uint32) uint32 {
if max < 2 {
return 0
}
var b [4]byte
rand.Read(b[:])
return binary.BigEndian.Uint32(b[:]) % max
}
func randUint64n(max uint64) uint64 {
if max < 2 {
return 0
}
var b [8]byte
rand.Read(b[:])
return binary.BigEndian.Uint64(b[:]) % max
}
// closest returns the n nodes in the table that are closest to the
// given id. The caller must hold tab.mutex.
func (tab *Table) closest(target common.Hash, nresults int) *nodesByDistance {
// This is a very wasteful way to find the closest nodes but
// obviously correct. I believe that tree-based buckets would make
// this easier to implement efficiently.
close := &nodesByDistance{target: target}
for _, b := range tab.buckets {
for _, n := range b.entries {
close.push(n, nresults)
}
}
return close
}
// add attempts to add the given node its corresponding bucket. If the
// bucket has space available, adding the node succeeds immediately.
// Otherwise, the node is added to the replacement cache for the bucket.
func (tab *Table) add(n *Node) (contested *Node) {
b := tab.buckets[logdist(tab.self.sha, n.sha)]
switch {
case b.bump(n):
// n exists in b.
return nil
case len(b.entries) < bucketSize:
// b has space available.
b.addFront(n)
tab.count++
if tab.nodeAddedHook != nil {
tab.nodeAddedHook(n)
}
return nil
default:
// b has no space left, add to replacement cache
// and revalidate the last entry.
// TODO: drop previous node
b.replacements = append(b.replacements, n)
if len(b.replacements) > bucketSize {
copy(b.replacements, b.replacements[1:])
b.replacements = b.replacements[:len(b.replacements)-1]
}
return b.entries[len(b.entries)-1]
}
}
// stuff adds nodes the table to the end of their corresponding bucket
// if the bucket is not full.
func (tab *Table) stuff(nodes []*Node) {
outer:
for _, n := range nodes {
if n.ID == tab.self.ID {
continue // don't add self
}
bucket := tab.buckets[logdist(tab.self.sha, n.sha)]
for i := range bucket.entries {
if bucket.entries[i].ID == n.ID {
continue outer // already in bucket
}
}
if len(bucket.entries) < bucketSize {
bucket.entries = append(bucket.entries, n)
tab.count++
if tab.nodeAddedHook != nil {
tab.nodeAddedHook(n)
}
}
}
}
// delete removes an entry from the node table (used to evacuate
// failed/non-bonded discovery peers).
func (tab *Table) delete(node *Node) {
bucket := tab.buckets[logdist(tab.self.sha, node.sha)]
for i := range bucket.entries {
if bucket.entries[i].ID == node.ID {
bucket.entries = append(bucket.entries[:i], bucket.entries[i+1:]...)
tab.count--
return
}
}
}
func (tab *Table) deleteReplace(node *Node) {
b := tab.buckets[logdist(tab.self.sha, node.sha)]
i := 0
for i < len(b.entries) {
if b.entries[i].ID == node.ID {
b.entries = append(b.entries[:i], b.entries[i+1:]...)
tab.count--
} else {
i++
}
}
// refill from replacement cache
// TODO: maybe use random index
if len(b.entries) < bucketSize && len(b.replacements) > 0 {
ri := len(b.replacements) - 1
b.addFront(b.replacements[ri])
tab.count++
b.replacements[ri] = nil
b.replacements = b.replacements[:ri]
}
}
func (b *bucket) addFront(n *Node) {
b.entries = append(b.entries, nil)
copy(b.entries[1:], b.entries)
b.entries[0] = n
}
func (b *bucket) bump(n *Node) bool {
for i := range b.entries {
if b.entries[i].ID == n.ID {
// move it to the front
copy(b.entries[1:], b.entries[:i])
b.entries[0] = n
return true
}
}
return false
}
// nodesByDistance is a list of nodes, ordered by
// distance to target.
type nodesByDistance struct {
entries []*Node
target common.Hash
}
// push adds the given node to the list, keeping the total size below maxElems.
func (h *nodesByDistance) push(n *Node, maxElems int) {
ix := sort.Search(len(h.entries), func(i int) bool {
return distcmp(h.target, h.entries[i].sha, n.sha) > 0
})
if len(h.entries) < maxElems {
h.entries = append(h.entries, n)
}
if ix == len(h.entries) {
// farther away than all nodes we already have.
// if there was room for it, the node is now the last element.
} else {
// slide existing entries down to make room
// this will overwrite the entry we just appended.
copy(h.entries[ix+1:], h.entries[ix:])
h.entries[ix] = n
}
}

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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"crypto/ecdsa"
"fmt"
"math/rand"
"net"
"reflect"
"testing"
"testing/quick"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
)
type nullTransport struct{}
func (nullTransport) sendPing(remote *Node, remoteAddr *net.UDPAddr) []byte { return []byte{1} }
func (nullTransport) sendPong(remote *Node, pingHash []byte) {}
func (nullTransport) sendFindnode(remote *Node, target NodeID) {}
func (nullTransport) sendNeighbours(remote *Node, nodes []*Node) {}
func (nullTransport) localAddr() *net.UDPAddr { return new(net.UDPAddr) }
func (nullTransport) Close() {}
// func TestTable_pingReplace(t *testing.T) {
// doit := func(newNodeIsResponding, lastInBucketIsResponding bool) {
// transport := newPingRecorder()
// tab, _ := newTable(transport, NodeID{}, &net.UDPAddr{})
// defer tab.Close()
// pingSender := NewNode(MustHexID("a502af0f59b2aab7746995408c79e9ca312d2793cc997e44fc55eda62f0150bbb8c59a6f9269ba3a081518b62699ee807c7c19c20125ddfccca872608af9e370"), net.IP{}, 99, 99)
//
// // fill up the sender's bucket.
// last := fillBucket(tab, 253)
//
// // this call to bond should replace the last node
// // in its bucket if the node is not responding.
// transport.responding[last.ID] = lastInBucketIsResponding
// transport.responding[pingSender.ID] = newNodeIsResponding
// tab.bond(true, pingSender.ID, &net.UDPAddr{}, 0)
//
// // first ping goes to sender (bonding pingback)
// if !transport.pinged[pingSender.ID] {
// t.Error("table did not ping back sender")
// }
// if newNodeIsResponding {
// // second ping goes to oldest node in bucket
// // to see whether it is still alive.
// if !transport.pinged[last.ID] {
// t.Error("table did not ping last node in bucket")
// }
// }
//
// tab.mutex.Lock()
// defer tab.mutex.Unlock()
// if l := len(tab.buckets[253].entries); l != bucketSize {
// t.Errorf("wrong bucket size after bond: got %d, want %d", l, bucketSize)
// }
//
// if lastInBucketIsResponding || !newNodeIsResponding {
// if !contains(tab.buckets[253].entries, last.ID) {
// t.Error("last entry was removed")
// }
// if contains(tab.buckets[253].entries, pingSender.ID) {
// t.Error("new entry was added")
// }
// } else {
// if contains(tab.buckets[253].entries, last.ID) {
// t.Error("last entry was not removed")
// }
// if !contains(tab.buckets[253].entries, pingSender.ID) {
// t.Error("new entry was not added")
// }
// }
// }
//
// doit(true, true)
// doit(false, true)
// doit(true, false)
// doit(false, false)
// }
func TestBucket_bumpNoDuplicates(t *testing.T) {
t.Parallel()
cfg := &quick.Config{
MaxCount: 1000,
Rand: rand.New(rand.NewSource(time.Now().Unix())),
Values: func(args []reflect.Value, rand *rand.Rand) {
// generate a random list of nodes. this will be the content of the bucket.
n := rand.Intn(bucketSize-1) + 1
nodes := make([]*Node, n)
for i := range nodes {
nodes[i] = nodeAtDistance(common.Hash{}, 200)
}
args[0] = reflect.ValueOf(nodes)
// generate random bump positions.
bumps := make([]int, rand.Intn(100))
for i := range bumps {
bumps[i] = rand.Intn(len(nodes))
}
args[1] = reflect.ValueOf(bumps)
},
}
prop := func(nodes []*Node, bumps []int) (ok bool) {
b := &bucket{entries: make([]*Node, len(nodes))}
copy(b.entries, nodes)
for i, pos := range bumps {
b.bump(b.entries[pos])
if hasDuplicates(b.entries) {
t.Logf("bucket has duplicates after %d/%d bumps:", i+1, len(bumps))
for _, n := range b.entries {
t.Logf(" %p", n)
}
return false
}
}
return true
}
if err := quick.Check(prop, cfg); err != nil {
t.Error(err)
}
}
// fillBucket inserts nodes into the given bucket until
// it is full. The node's IDs dont correspond to their
// hashes.
func fillBucket(tab *Table, ld int) (last *Node) {
b := tab.buckets[ld]
for len(b.entries) < bucketSize {
b.entries = append(b.entries, nodeAtDistance(tab.self.sha, ld))
}
return b.entries[bucketSize-1]
}
// nodeAtDistance creates a node for which logdist(base, n.sha) == ld.
// The node's ID does not correspond to n.sha.
func nodeAtDistance(base common.Hash, ld int) (n *Node) {
n = new(Node)
n.sha = hashAtDistance(base, ld)
copy(n.ID[:], n.sha[:]) // ensure the node still has a unique ID
return n
}
type pingRecorder struct{ responding, pinged map[NodeID]bool }
func newPingRecorder() *pingRecorder {
return &pingRecorder{make(map[NodeID]bool), make(map[NodeID]bool)}
}
func (t *pingRecorder) findnode(toid NodeID, toaddr *net.UDPAddr, target NodeID) ([]*Node, error) {
panic("findnode called on pingRecorder")
}
func (t *pingRecorder) close() {}
func (t *pingRecorder) waitping(from NodeID) error {
return nil // remote always pings
}
func (t *pingRecorder) ping(toid NodeID, toaddr *net.UDPAddr) error {
t.pinged[toid] = true
if t.responding[toid] {
return nil
} else {
return errTimeout
}
}
func TestTable_closest(t *testing.T) {
t.Parallel()
test := func(test *closeTest) bool {
// for any node table, Target and N
tab := newTable(test.Self, &net.UDPAddr{})
tab.stuff(test.All)
// check that doClosest(Target, N) returns nodes
result := tab.closest(test.Target, test.N).entries
if hasDuplicates(result) {
t.Errorf("result contains duplicates")
return false
}
if !sortedByDistanceTo(test.Target, result) {
t.Errorf("result is not sorted by distance to target")
return false
}
// check that the number of results is min(N, tablen)
wantN := test.N
if tab.count < test.N {
wantN = tab.count
}
if len(result) != wantN {
t.Errorf("wrong number of nodes: got %d, want %d", len(result), wantN)
return false
} else if len(result) == 0 {
return true // no need to check distance
}
// check that the result nodes have minimum distance to target.
for _, b := range tab.buckets {
for _, n := range b.entries {
if contains(result, n.ID) {
continue // don't run the check below for nodes in result
}
farthestResult := result[len(result)-1].sha
if distcmp(test.Target, n.sha, farthestResult) < 0 {
t.Errorf("table contains node that is closer to target but it's not in result")
t.Logf(" Target: %v", test.Target)
t.Logf(" Farthest Result: %v", farthestResult)
t.Logf(" ID: %v", n.ID)
return false
}
}
}
return true
}
if err := quick.Check(test, quickcfg()); err != nil {
t.Error(err)
}
}
func TestTable_ReadRandomNodesGetAll(t *testing.T) {
cfg := &quick.Config{
MaxCount: 200,
Rand: rand.New(rand.NewSource(time.Now().Unix())),
Values: func(args []reflect.Value, rand *rand.Rand) {
args[0] = reflect.ValueOf(make([]*Node, rand.Intn(1000)))
},
}
test := func(buf []*Node) bool {
tab := newTable(NodeID{}, &net.UDPAddr{})
for i := 0; i < len(buf); i++ {
ld := cfg.Rand.Intn(len(tab.buckets))
tab.stuff([]*Node{nodeAtDistance(tab.self.sha, ld)})
}
gotN := tab.readRandomNodes(buf)
if gotN != tab.count {
t.Errorf("wrong number of nodes, got %d, want %d", gotN, tab.count)
return false
}
if hasDuplicates(buf[:gotN]) {
t.Errorf("result contains duplicates")
return false
}
return true
}
if err := quick.Check(test, cfg); err != nil {
t.Error(err)
}
}
type closeTest struct {
Self NodeID
Target common.Hash
All []*Node
N int
}
func (*closeTest) Generate(rand *rand.Rand, size int) reflect.Value {
t := &closeTest{
Self: gen(NodeID{}, rand).(NodeID),
Target: gen(common.Hash{}, rand).(common.Hash),
N: rand.Intn(bucketSize),
}
for _, id := range gen([]NodeID{}, rand).([]NodeID) {
t.All = append(t.All, &Node{ID: id})
}
return reflect.ValueOf(t)
}
func hasDuplicates(slice []*Node) bool {
seen := make(map[NodeID]bool)
for i, e := range slice {
if e == nil {
panic(fmt.Sprintf("nil *Node at %d", i))
}
if seen[e.ID] {
return true
}
seen[e.ID] = true
}
return false
}
func sortedByDistanceTo(distbase common.Hash, slice []*Node) bool {
var last common.Hash
for i, e := range slice {
if i > 0 && distcmp(distbase, e.sha, last) < 0 {
return false
}
last = e.sha
}
return true
}
func contains(ns []*Node, id NodeID) bool {
for _, n := range ns {
if n.ID == id {
return true
}
}
return false
}
// gen wraps quick.Value so it's easier to use.
// it generates a random value of the given value's type.
func gen(typ interface{}, rand *rand.Rand) interface{} {
v, ok := quick.Value(reflect.TypeOf(typ), rand)
if !ok {
panic(fmt.Sprintf("couldn't generate random value of type %T", typ))
}
return v.Interface()
}
func newkey() *ecdsa.PrivateKey {
key, err := crypto.GenerateKey()
if err != nil {
panic("couldn't generate key: " + err.Error())
}
return key
}

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package main
import (
"bufio"
"encoding/binary"
"fmt"
"image"
"image/png"
"os"
"sort"
"strconv"
"github.com/ethereum/go-ethereum/crypto"
)
var xs, ys, maxTime int
func set(pic *image.NRGBA, x, y, c, v int) {
if v > 255 {
v = 255
}
if x >= 0 && x < xs && y >= 0 && y < ys {
pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
}
}
func main() {
topicHash := crypto.Keccak256Hash([]byte("foo"))
fmt.Println(topicHash)
topicPrefix := binary.BigEndian.Uint64(topicHash[:8])
var nodes uint64Slice
inputFile := "test.out"
if len(os.Args) > 1 {
inputFile = os.Args[1]
}
f, _ := os.Open(inputFile)
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
for scanner.Scan() {
w := scanner.Text()
if w == "*N" {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
nodes = append(nodes, prefix^topicPrefix)
}
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(time) > maxTime {
maxTime = int(time)
}
}
}
f.Close()
sort.Sort(nodes)
nodeIdx := make(map[uint64]int)
for i, v := range nodes {
nodeIdx[v^topicPrefix] = i
}
xs = maxTime / 10000
ys = len(nodes)
pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic, x, y, 3, 255)
}
}
pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic2, x, y, 3, 255)
}
}
f, _ = os.Open(inputFile)
scanner = bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
nodeRad := make(map[uint64]int)
for scanner.Scan() {
w := scanner.Text()
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(rad) != nodeRad[prefix] {
nodeRad[prefix] = int(rad)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 1, 255)
}
}
if w == "*MR" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 0, 255)
}
if w == "*W" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic2, x, y, 0, int(wp/100000))
set(pic2, x, y, 1, int(wp/10000))
set(pic2, x, y, 2, int(wp/1000))
}
if w == "*+" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic, x, y, 2, 255)
scanner.Scan()
}
}
f.Close()
f, _ = os.Create("test.png")
w := bufio.NewWriter(f)
png.Encode(w, pic)
w.Flush()
f.Close()
f, _ = os.Create("test2.png")
w = bufio.NewWriter(f)
png.Encode(w, pic2)
w.Flush()
f.Close()
}
type uint64Slice []uint64
// Len is the number of elements in the collection.
func (s uint64Slice) Len() int {
return len(s)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (s uint64Slice) Less(i, j int) bool {
return s[i] < s[j]
}
// Swap swaps the elements with indexes i and j.
func (s uint64Slice) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}

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package main
import (
"bufio"
"encoding/binary"
"fmt"
"image"
"image/png"
"os"
"sort"
"strconv"
"github.com/ethereum/go-ethereum/crypto"
)
var xs, ys, maxTime int
func set(pic *image.NRGBA, x, y, c, v int) {
if v > 255 {
v = 255
}
if x >= 0 && x < xs && y >= 0 && y < ys {
pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
}
}
func main() {
topics := make(map[string]uint64)
var nodes uint64Slice
inputFile := "test.out"
if len(os.Args) > 1 {
inputFile = os.Args[1]
}
f, _ := os.Open(inputFile)
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
for scanner.Scan() {
w := scanner.Text()
if w == "*N" {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
nodes = append(nodes, prefix^topicPrefix)
}
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(time) > maxTime {
maxTime = int(time)
}
scanner.Scan()
topic := scanner.Text()
if _, ok := topics[topic]; !ok {
fmt.Println(topic)
topicHash := crypto.Keccak256Hash([]byte(topic))
topics[topic] := binary.BigEndian.Uint64(topicHash[:8])
}
}
}
f.Close()
sort.Sort(nodes)
nodeIdx := make(map[uint64]int)
for i, v := range nodes {
nodeIdx[v^topicPrefix] = i
}
xs = maxTime / 10000
ys = len(nodes)
pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic, x, y, 3, 255)
}
}
pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic2, x, y, 3, 255)
}
}
f, _ = os.Open(inputFile)
scanner = bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
nodeRad := make(map[uint64]int)
for scanner.Scan() {
w := scanner.Text()
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(rad) != nodeRad[prefix] {
nodeRad[prefix] = int(rad)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 1, 255)
}
}
if w == "*MR" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 0, 255)
}
if w == "*W" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic2, x, y, 0, int(wp/100000))
set(pic2, x, y, 1, int(wp/10000))
set(pic2, x, y, 2, int(wp/1000))
}
if w == "*+" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic, x, y, 2, 255)
scanner.Scan()
}
}
f.Close()
f, _ = os.Create("test.png")
w := bufio.NewWriter(f)
png.Encode(w, pic)
w.Flush()
f.Close()
f, _ = os.Create("test2.png")
w = bufio.NewWriter(f)
png.Encode(w, pic2)
w.Flush()
f.Close()
}
type uint64Slice []uint64
// Len is the number of elements in the collection.
func (s uint64Slice) Len() int {
return len(s)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (s uint64Slice) Less(i, j int) bool {
return s[i] < s[j]
}
// Swap swaps the elements with indexes i and j.
func (s uint64Slice) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}

191
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package main
import (
"bufio"
"encoding/binary"
"fmt"
"image"
"image/png"
"os"
"sort"
"strconv"
"github.com/ethereum/go-ethereum/crypto"
)
var xs, ys, maxTime int
func set(pic *image.NRGBA, x, y, c, v int) {
if v > 255 {
v = 255
}
if x >= 0 && x < xs && y >= 0 && y < ys {
pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
}
}
func main() {
var nodes uint64Slice
inputFile := "test.out"
if len(os.Args) > 1 {
inputFile = os.Args[1]
}
topic := "foo"
if len(os.Args) > 2 {
topic = os.Args[2]
}
topicHash := crypto.Keccak256Hash([]byte(topic))
fmt.Println(topicHash)
topicPrefix := binary.BigEndian.Uint64(topicHash[:8])
f, _ := os.Open(inputFile)
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
for scanner.Scan() {
w := scanner.Text()
if w == "*N" {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
nodes = append(nodes, prefix^topicPrefix)
}
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(time) > maxTime {
maxTime = int(time)
}
}
}
f.Close()
sort.Sort(nodes)
nodeIdx := make(map[uint64]int)
for i, v := range nodes {
nodeIdx[v^topicPrefix] = i
}
xs = maxTime / 10000
ys = len(nodes)
pic := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic, x, y, 3, 255)
}
}
pic2 := image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(pic2, x, y, 3, 255)
}
}
f, _ = os.Open(inputFile)
scanner = bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
nodeRad := make(map[uint64]int)
for scanner.Scan() {
w := scanner.Text()
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
if scanner.Text() == topic {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(rad) != nodeRad[prefix] {
nodeRad[prefix] = int(rad)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 1, 255)
}
}
}
if w == "*MR" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
if scanner.Text() == topic {
scanner.Scan()
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return nodes[i] > radUint
})
set(pic, x, y, 0, 255)
}
}
if w == "*W" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
if scanner.Text() == topic {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic2, x, y, 0, int(wp/100000))
set(pic2, x, y, 1, int(wp/10000))
set(pic2, x, y, 2, int(wp/1000))
}
}
if w == "*+" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
scanner.Scan()
if scanner.Text() == topic {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
x := int(time * int64(xs) / int64(maxTime))
y := nodeIdx[prefix]
set(pic, x, y, 2, 255)
scanner.Scan()
}
}
}
f.Close()
f, _ = os.Create("test.png")
w := bufio.NewWriter(f)
png.Encode(w, pic)
w.Flush()
f.Close()
f, _ = os.Create("test2.png")
w = bufio.NewWriter(f)
png.Encode(w, pic2)
w.Flush()
f.Close()
}
type uint64Slice []uint64
// Len is the number of elements in the collection.
func (s uint64Slice) Len() int {
return len(s)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (s uint64Slice) Less(i, j int) bool {
return s[i] < s[j]
}
// Swap swaps the elements with indexes i and j.
func (s uint64Slice) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}

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package main
import (
"bufio"
"encoding/binary"
"fmt"
"image"
"image/png"
"math"
"os"
"sort"
"strconv"
"github.com/ethereum/go-ethereum/crypto"
)
var xs, ys, maxTime int
var minAbsTime, maxAbsTime int64
func set(pic *image.NRGBA, x, y, c, v int) {
if v > 255 {
v = 255
}
if x >= 0 && x < xs && y >= 0 && y < ys {
pic.Pix[y*pic.Stride+x*4+c] = uint8(v)
}
}
type nodeStats []struct{ wpSum, wpCnt, wpXcnt, regCnt, regXcnt uint64 }
type nodeInfo struct {
maxMR int
topics map[string]struct{}
}
const (
regStatDiv = 60
regStatYdiv = 30
)
type topicInfo struct {
prefix uint64
nodes uint64Slice
nodeStats nodeStats
nodeIdx map[uint64]int
pic, pic2 *image.NRGBA
nodeRad map[uint64]int
regStats []int
}
func main() {
var nodes uint64Slice
topics := make(map[string]*topicInfo)
inputFile := "test.out"
if len(os.Args) > 1 {
inputFile = os.Args[1]
}
f, _ := os.Open(inputFile)
scanner := bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
minAbsTime = math.MaxInt64
for scanner.Scan() {
w := scanner.Text()
if w == "*N" {
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
nodes = append(nodes, prefix)
}
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if time > maxAbsTime {
maxAbsTime = time
}
if time < minAbsTime {
minAbsTime = time
}
scanner.Scan()
topic := scanner.Text()
if _, ok := topics[topic]; !ok {
fmt.Println(topic)
topicHash := crypto.Keccak256Hash([]byte(topic))
topics[topic] = &topicInfo{prefix: binary.BigEndian.Uint64(topicHash[:8])}
}
}
}
f.Close()
maxTime = int(maxAbsTime - minAbsTime)
xs = maxTime / 10000
ys = len(nodes)
nodeIdx := make(map[uint64]int)
for i, v := range nodes {
nodeIdx[v] = i
}
nodeInfo := make([]nodeInfo, len(nodes))
for _, t := range topics {
t.nodes = make(uint64Slice, len(nodes))
t.nodeStats = make(nodeStats, len(nodes))
for i, v := range nodes {
t.nodes[i] = v ^ t.prefix
}
sort.Sort(t.nodes)
t.nodeIdx = make(map[uint64]int)
for i, v := range t.nodes {
t.nodeIdx[v^t.prefix] = i
}
t.pic = image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(t.pic, x, y, 3, 255)
}
}
t.pic2 = image.NewNRGBA(image.Rect(0, 0, xs, ys))
for y := 0; y < ys; y++ {
for x := 0; x < xs; x++ {
set(t.pic2, x, y, 3, 255)
}
}
t.nodeRad = make(map[uint64]int)
t.regStats = make([]int, xs/regStatDiv+1)
}
f, _ = os.Open(inputFile)
scanner = bufio.NewScanner(f)
scanner.Split(bufio.ScanWords)
statBegin := int64(40000000)
statEnd := int64(maxTime - 10000000)
for scanner.Scan() {
w := scanner.Text()
if w == "*R" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
time -= minAbsTime
scanner.Scan()
t := topics[scanner.Text()]
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
if int(rad) != t.nodeRad[prefix] {
t.nodeRad[prefix] = int(rad)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return t.nodes[i] > radUint
})
set(t.pic, x, y, 1, 255)
}
}
if w == "*MR" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
time -= minAbsTime
scanner.Scan()
topic := scanner.Text()
t := topics[topic]
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
rad, _ := strconv.ParseInt(scanner.Text(), 10, 64)
radUint := uint64(rad) * ((^uint64(0)) / 1000000)
x := int(time * int64(xs) / int64(maxTime))
y := sort.Search(ys, func(i int) bool {
return t.nodes[i] > radUint
})
set(t.pic, x, y, 0, 255)
ni := nodeInfo[nodeIdx[prefix]]
if int(rad) > ni.maxMR {
ni.maxMR = int(rad)
if ni.topics == nil {
ni.topics = make(map[string]struct{})
}
ni.topics[topic] = struct{}{}
}
nodeInfo[nodeIdx[prefix]] = ni
}
if w == "*W" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
time -= minAbsTime
scanner.Scan()
t := topics[scanner.Text()]
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
scanner.Scan()
wp, _ := strconv.ParseInt(scanner.Text(), 10, 64)
x := int(time * int64(xs) / int64(maxTime))
y := t.nodeIdx[prefix]
if time >= statBegin && time < statEnd {
t.nodeStats[y].wpSum += uint64(wp)
if wp >= 600000 {
t.nodeStats[y].wpXcnt++
}
t.nodeStats[y].wpCnt++
}
/*set(t.pic2, x, y, 0, int(wp/100000))
set(t.pic2, x, y, 1, int(wp/10000))
set(t.pic2, x, y, 2, int(wp/1000))*/
if wp >= 1800000 {
set(t.pic2, x, y, 0, 255)
}
if wp >= 600000 {
set(t.pic2, x, y, 1, 255)
}
if wp >= 60000 {
set(t.pic2, x, y, 2, 255)
}
}
if w == "*+" {
scanner.Scan()
time, _ := strconv.ParseInt(scanner.Text(), 10, 64)
time -= minAbsTime
scanner.Scan()
t := topics[scanner.Text()]
scanner.Scan()
prefix, _ := strconv.ParseUint(scanner.Text(), 16, 64)
x := int(time * int64(xs) / int64(maxTime))
if x < xs {
t.regStats[x/regStatDiv]++
}
y := t.nodeIdx[prefix]
set(t.pic, x, y, 2, 255)
scanner.Scan()
prefix2, _ := strconv.ParseUint(scanner.Text(), 16, 64)
y2 := t.nodeIdx[prefix2]
if time >= statBegin && time < statEnd {
t.nodeStats[y].regCnt++
t.nodeStats[y2].regXcnt++
}
}
}
f.Close()
for tt, t := range topics {
f, _ = os.Create("test_" + tt + ".png")
w := bufio.NewWriter(f)
png.Encode(w, t.pic)
w.Flush()
f.Close()
for x := 0; x < xs; x++ {
yy := t.regStats[x/regStatDiv] / regStatYdiv
if yy > ys {
yy = ys
}
for y := 0; y < yy; y++ {
set(t.pic2, x, ys-1-y, 1, 255)
}
}
f, _ = os.Create("test2_" + tt + ".png")
w = bufio.NewWriter(f)
png.Encode(w, t.pic2)
w.Flush()
f.Close()
if statEnd > statBegin {
xxs := len(t.nodeStats)
yys := 1000
yyh := yys / 2
pic3 := image.NewNRGBA(image.Rect(0, 0, xxs, yys))
for y := 0; y < yys; y++ {
for x := 0; x < xxs; x++ {
set(pic3, x, y, 3, 255)
}
}
for x := 0; x < xxs; x++ {
wpy := 0
if t.nodeStats[x].wpCnt > 0 {
// wpy = int(t.nodeStats[x].wpSum / t.nodeStats[x].wpCnt / 10000)
wpy = int(uint64(yyh) * t.nodeStats[x].wpXcnt / t.nodeStats[x].wpCnt)
}
if wpy > yyh {
wpy = yyh
}
for y := 0; y < wpy; y++ {
set(pic3, x, yys-1-y, 1, 255)
}
regy := int(t.nodeStats[x].regCnt * 2400000 / uint64(statEnd-statBegin))
if regy > yyh {
regy = yyh
}
for y := 0; y < regy; y++ {
set(pic3, x, yyh-1-y, 2, 255)
}
regy2 := int(t.nodeStats[x].regXcnt * 2400000 / uint64(statEnd-statBegin))
if regy2 > yyh {
regy2 = yyh
}
for y := 0; y < regy2; y++ {
set(pic3, x, yyh-1-y, 0, 255)
}
}
f, _ = os.Create("test3_" + tt + ".png")
w = bufio.NewWriter(f)
png.Encode(w, pic3)
w.Flush()
f.Close()
}
}
for i, ni := range nodeInfo {
fmt.Printf("%d %016x maxMR = %d ", i, nodes[i], ni.maxMR)
for t, _ := range ni.topics {
fmt.Printf(" %s", t)
}
fmt.Println()
}
}
type uint64Slice []uint64
// Len is the number of elements in the collection.
func (s uint64Slice) Len() int {
return len(s)
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (s uint64Slice) Less(i, j int) bool {
return s[i] < s[j]
}
// Swap swaps the elements with indexes i and j.
func (s uint64Slice) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}

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p2p/discv5/ticket.go Normal file
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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"bytes"
"encoding/binary"
"fmt"
"math"
"math/rand"
"sort"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/crypto"
)
const (
ticketTimeBucketLen = time.Minute
timeWindow = 10 // * ticketTimeBucketLen
wantTicketsInWindow = 10
collectFrequency = time.Second * 30
registerFrequency = time.Second * 60
maxCollectDebt = 10
maxRegisterDebt = 5
keepTicketConst = time.Minute * 10
keepTicketExp = time.Minute * 5
targetWaitTime = time.Minute * 10
topicQueryTimeout = time.Second * 5
topicQueryResend = time.Minute
// topic radius detection
maxRadius = 0xffffffffffffffff
radiusTC = time.Minute * 20
radiusBucketsPerBit = 8
minSlope = 1
minPeakSize = 40
maxNoAdjust = 20
lookupWidth = 8
minRightSum = 20
searchForceQuery = 4
)
// timeBucket represents absolute monotonic time in minutes.
// It is used as the index into the per-topic ticket buckets.
type timeBucket int
type ticket struct {
topics []Topic
regTime []mclock.AbsTime // Per-topic local absolute time when the ticket can be used.
// The serial number that was issued by the server.
serial uint32
// Used by registrar, tracks absolute time when the ticket was created.
issueTime mclock.AbsTime
// Fields used only by registrants
node *Node // the registrar node that signed this ticket
refCnt int // tracks number of topics that will be registered using this ticket
pong []byte // encoded pong packet signed by the registrar
}
// ticketRef refers to a single topic in a ticket.
type ticketRef struct {
t *ticket
idx int // index of the topic in t.topics and t.regTime
}
func (ref ticketRef) topic() Topic {
return ref.t.topics[ref.idx]
}
func (ref ticketRef) topicRegTime() mclock.AbsTime {
return ref.t.regTime[ref.idx]
}
func pongToTicket(localTime mclock.AbsTime, topics []Topic, node *Node, p *ingressPacket) (*ticket, error) {
wps := p.data.(*pong).WaitPeriods
if len(topics) != len(wps) {
return nil, fmt.Errorf("bad wait period list: got %d values, want %d", len(topics), len(wps))
}
if rlpHash(topics) != p.data.(*pong).TopicHash {
return nil, fmt.Errorf("bad topic hash")
}
t := &ticket{
issueTime: localTime,
node: node,
topics: topics,
pong: p.rawData,
regTime: make([]mclock.AbsTime, len(wps)),
}
// Convert wait periods to local absolute time.
for i, wp := range wps {
t.regTime[i] = localTime + mclock.AbsTime(time.Second*time.Duration(wp))
}
return t, nil
}
func ticketToPong(t *ticket, pong *pong) {
pong.Expiration = uint64(t.issueTime / mclock.AbsTime(time.Second))
pong.TopicHash = rlpHash(t.topics)
pong.TicketSerial = t.serial
pong.WaitPeriods = make([]uint32, len(t.regTime))
for i, regTime := range t.regTime {
pong.WaitPeriods[i] = uint32(time.Duration(regTime-t.issueTime) / time.Second)
}
}
type ticketStore struct {
// radius detector and target address generator
// exists for both searched and registered topics
radius map[Topic]*topicRadius
// Contains buckets (for each absolute minute) of tickets
// that can be used in that minute.
// This is only set if the topic is being registered.
tickets map[Topic]topicTickets
regtopics []Topic
nodes map[*Node]*ticket
nodeLastReq map[*Node]reqInfo
lastBucketFetched timeBucket
nextTicketCached *ticketRef
nextTicketReg mclock.AbsTime
searchTopicMap map[Topic]searchTopic
searchTopicList []Topic
searchTopicPtr int
nextTopicQueryCleanup mclock.AbsTime
queriesSent map[*Node]map[common.Hash]sentQuery
radiusLookupCnt int
}
type searchTopic struct {
foundChn chan<- string
listIdx int
}
type sentQuery struct {
sent mclock.AbsTime
lookup lookupInfo
}
type topicTickets struct {
buckets map[timeBucket][]ticketRef
nextLookup, nextReg mclock.AbsTime
}
func newTicketStore() *ticketStore {
return &ticketStore{
radius: make(map[Topic]*topicRadius),
tickets: make(map[Topic]topicTickets),
nodes: make(map[*Node]*ticket),
nodeLastReq: make(map[*Node]reqInfo),
searchTopicMap: make(map[Topic]searchTopic),
queriesSent: make(map[*Node]map[common.Hash]sentQuery),
}
}
// addTopic starts tracking a topic. If register is true,
// the local node will register the topic and tickets will be collected.
func (s *ticketStore) addTopic(t Topic, register bool) {
debugLog(fmt.Sprintf(" addTopic(%v, %v)", t, register))
if s.radius[t] == nil {
s.radius[t] = newTopicRadius(t)
}
if register && s.tickets[t].buckets == nil {
s.tickets[t] = topicTickets{buckets: make(map[timeBucket][]ticketRef)}
}
}
func (s *ticketStore) addSearchTopic(t Topic, foundChn chan<- string) {
s.addTopic(t, false)
if s.searchTopicMap[t].foundChn == nil {
s.searchTopicList = append(s.searchTopicList, t)
s.searchTopicMap[t] = searchTopic{foundChn: foundChn, listIdx: len(s.searchTopicList) - 1}
}
}
func (s *ticketStore) removeSearchTopic(t Topic) {
if st := s.searchTopicMap[t]; st.foundChn != nil {
lastIdx := len(s.searchTopicList) - 1
lastTopic := s.searchTopicList[lastIdx]
s.searchTopicList[st.listIdx] = lastTopic
sl := s.searchTopicMap[lastTopic]
sl.listIdx = st.listIdx
s.searchTopicMap[lastTopic] = sl
s.searchTopicList = s.searchTopicList[:lastIdx]
delete(s.searchTopicMap, t)
}
}
// removeRegisterTopic deletes all tickets for the given topic.
func (s *ticketStore) removeRegisterTopic(topic Topic) {
debugLog(fmt.Sprintf(" removeRegisterTopic(%v)", topic))
for _, list := range s.tickets[topic].buckets {
for _, ref := range list {
ref.t.refCnt--
if ref.t.refCnt == 0 {
delete(s.nodes, ref.t.node)
delete(s.nodeLastReq, ref.t.node)
}
}
}
delete(s.tickets, topic)
}
func (s *ticketStore) regTopicSet() []Topic {
topics := make([]Topic, 0, len(s.tickets))
for topic := range s.tickets {
topics = append(topics, topic)
}
return topics
}
// nextRegisterLookup returns the target of the next lookup for ticket collection.
func (s *ticketStore) nextRegisterLookup() (lookup lookupInfo, delay time.Duration) {
debugLog("nextRegisterLookup()")
firstTopic, ok := s.iterRegTopics()
for topic := firstTopic; ok; {
debugLog(fmt.Sprintf(" checking topic %v, len(s.tickets[topic]) = %d", topic, len(s.tickets[topic].buckets)))
if s.tickets[topic].buckets != nil && s.needMoreTickets(topic) {
next := s.radius[topic].nextTarget(false)
debugLog(fmt.Sprintf(" %x 1s", next.target[:8]))
return next, 100 * time.Millisecond
}
topic, ok = s.iterRegTopics()
if topic == firstTopic {
break // We have checked all topics.
}
}
debugLog(" null, 40s")
return lookupInfo{}, 40 * time.Second
}
func (s *ticketStore) nextSearchLookup() lookupInfo {
if len(s.searchTopicList) == 0 {
return lookupInfo{}
}
if s.searchTopicPtr >= len(s.searchTopicList) {
s.searchTopicPtr = 0
}
topic := s.searchTopicList[s.searchTopicPtr]
s.searchTopicPtr++
target := s.radius[topic].nextTarget(s.radiusLookupCnt >= searchForceQuery)
if target.radiusLookup {
s.radiusLookupCnt++
} else {
s.radiusLookupCnt = 0
}
return target
}
// iterRegTopics returns topics to register in arbitrary order.
// The second return value is false if there are no topics.
func (s *ticketStore) iterRegTopics() (Topic, bool) {
debugLog("iterRegTopics()")
if len(s.regtopics) == 0 {
if len(s.tickets) == 0 {
debugLog(" false")
return "", false
}
// Refill register list.
for t := range s.tickets {
s.regtopics = append(s.regtopics, t)
}
}
topic := s.regtopics[len(s.regtopics)-1]
s.regtopics = s.regtopics[:len(s.regtopics)-1]
debugLog(" " + string(topic) + " true")
return topic, true
}
func (s *ticketStore) needMoreTickets(t Topic) bool {
return s.tickets[t].nextLookup < mclock.Now()
}
// ticketsInWindow returns the tickets of a given topic in the registration window.
func (s *ticketStore) ticketsInWindow(t Topic) []ticketRef {
ltBucket := s.lastBucketFetched
var res []ticketRef
tickets := s.tickets[t].buckets
for g := ltBucket; g < ltBucket+timeWindow; g++ {
res = append(res, tickets[g]...)
}
debugLog(fmt.Sprintf("ticketsInWindow(%v) = %v", t, len(res)))
return res
}
func (s *ticketStore) removeExcessTickets(t Topic) {
tickets := s.ticketsInWindow(t)
if len(tickets) <= wantTicketsInWindow {
return
}
sort.Sort(ticketRefByWaitTime(tickets))
for _, r := range tickets[wantTicketsInWindow:] {
s.removeTicketRef(r)
}
}
type ticketRefByWaitTime []ticketRef
// Len is the number of elements in the collection.
func (s ticketRefByWaitTime) Len() int {
return len(s)
}
func (r ticketRef) waitTime() mclock.AbsTime {
return r.t.regTime[r.idx] - r.t.issueTime
}
// Less reports whether the element with
// index i should sort before the element with index j.
func (s ticketRefByWaitTime) Less(i, j int) bool {
return s[i].waitTime() < s[j].waitTime()
}
// Swap swaps the elements with indexes i and j.
func (s ticketRefByWaitTime) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (s *ticketStore) addTicketRef(r ticketRef) {
topic := r.t.topics[r.idx]
t := s.tickets[topic]
if t.buckets == nil {
return
}
bucket := timeBucket(r.t.regTime[r.idx] / mclock.AbsTime(ticketTimeBucketLen))
t.buckets[bucket] = append(t.buckets[bucket], r)
r.t.refCnt++
min := mclock.Now() - mclock.AbsTime(collectFrequency)*maxCollectDebt
if t.nextLookup < min {
t.nextLookup = min
}
t.nextLookup += mclock.AbsTime(collectFrequency)
s.tickets[topic] = t
//s.removeExcessTickets(topic)
}
func (s *ticketStore) nextFilteredTicket() (t *ticketRef, wait time.Duration) {
now := mclock.Now()
for {
t, wait = s.nextRegisterableTicket()
if t == nil {
return
}
regTime := now + mclock.AbsTime(wait)
topic := t.t.topics[t.idx]
if regTime >= s.tickets[topic].nextReg {
return
}
s.removeTicketRef(*t)
}
}
func (s *ticketStore) ticketRegistered(t ticketRef) {
now := mclock.Now()
topic := t.t.topics[t.idx]
tt := s.tickets[topic]
min := now - mclock.AbsTime(registerFrequency)*maxRegisterDebt
if min > tt.nextReg {
tt.nextReg = min
}
tt.nextReg += mclock.AbsTime(registerFrequency)
s.tickets[topic] = tt
s.removeTicketRef(t)
}
// nextRegisterableTicket returns the next ticket that can be used
// to register.
//
// If the returned wait time <= zero the ticket can be used. For a positive
// wait time, the caller should requery the next ticket later.
//
// A ticket can be returned more than once with <= zero wait time in case
// the ticket contains multiple topics.
func (s *ticketStore) nextRegisterableTicket() (t *ticketRef, wait time.Duration) {
defer func() {
if t == nil {
debugLog(" nil")
} else {
debugLog(fmt.Sprintf(" node = %x sn = %v wait = %v", t.t.node.ID[:8], t.t.serial, wait))
}
}()
debugLog("nextRegisterableTicket()")
now := mclock.Now()
if s.nextTicketCached != nil {
return s.nextTicketCached, time.Duration(s.nextTicketCached.topicRegTime() - now)
}
for bucket := s.lastBucketFetched; ; bucket++ {
var (
empty = true // true if there are no tickets
nextTicket ticketRef // uninitialized if this bucket is empty
)
for _, tickets := range s.tickets {
//s.removeExcessTickets(topic)
if len(tickets.buckets) != 0 {
empty = false
if list := tickets.buckets[bucket]; list != nil {
for _, ref := range list {
//debugLog(fmt.Sprintf(" nrt bucket = %d node = %x sn = %v wait = %v", bucket, ref.t.node.ID[:8], ref.t.serial, time.Duration(ref.topicRegTime()-now)))
if nextTicket.t == nil || ref.topicRegTime() < nextTicket.topicRegTime() {
nextTicket = ref
}
}
}
}
}
if empty {
return nil, 0
}
if nextTicket.t != nil {
wait = time.Duration(nextTicket.topicRegTime() - now)
s.nextTicketCached = &nextTicket
return &nextTicket, wait
}
s.lastBucketFetched = bucket
}
}
// removeTicket removes a ticket from the ticket store
func (s *ticketStore) removeTicketRef(ref ticketRef) {
debugLog(fmt.Sprintf("removeTicketRef(node = %x sn = %v)", ref.t.node.ID[:8], ref.t.serial))
topic := ref.topic()
tickets := s.tickets[topic].buckets
if tickets == nil {
return
}
bucket := timeBucket(ref.t.regTime[ref.idx] / mclock.AbsTime(ticketTimeBucketLen))
list := tickets[bucket]
idx := -1
for i, bt := range list {
if bt.t == ref.t {
idx = i
break
}
}
if idx == -1 {
panic(nil)
}
list = append(list[:idx], list[idx+1:]...)
if len(list) != 0 {
tickets[bucket] = list
} else {
delete(tickets, bucket)
}
ref.t.refCnt--
if ref.t.refCnt == 0 {
delete(s.nodes, ref.t.node)
delete(s.nodeLastReq, ref.t.node)
}
// Make nextRegisterableTicket return the next available ticket.
s.nextTicketCached = nil
}
type lookupInfo struct {
target common.Hash
topic Topic
radiusLookup bool
}
type reqInfo struct {
pingHash []byte
lookup lookupInfo
time mclock.AbsTime
}
// returns -1 if not found
func (t *ticket) findIdx(topic Topic) int {
for i, tt := range t.topics {
if tt == topic {
return i
}
}
return -1
}
func (s *ticketStore) registerLookupDone(lookup lookupInfo, nodes []*Node, ping func(n *Node) []byte) {
now := mclock.Now()
for i, n := range nodes {
if i == 0 || (binary.BigEndian.Uint64(n.sha[:8])^binary.BigEndian.Uint64(lookup.target[:8])) < s.radius[lookup.topic].minRadius {
if lookup.radiusLookup {
if lastReq, ok := s.nodeLastReq[n]; !ok || time.Duration(now-lastReq.time) > radiusTC {
s.nodeLastReq[n] = reqInfo{pingHash: ping(n), lookup: lookup, time: now}
}
} else {
if s.nodes[n] == nil {
s.nodeLastReq[n] = reqInfo{pingHash: ping(n), lookup: lookup, time: now}
}
}
}
}
}
func (s *ticketStore) searchLookupDone(lookup lookupInfo, nodes []*Node, ping func(n *Node) []byte, query func(n *Node, topic Topic) []byte) {
now := mclock.Now()
for i, n := range nodes {
if i == 0 || (binary.BigEndian.Uint64(n.sha[:8])^binary.BigEndian.Uint64(lookup.target[:8])) < s.radius[lookup.topic].minRadius {
if lookup.radiusLookup {
if lastReq, ok := s.nodeLastReq[n]; !ok || time.Duration(now-lastReq.time) > radiusTC {
s.nodeLastReq[n] = reqInfo{pingHash: ping(n), lookup: lookup, time: now}
}
} // else {
if s.canQueryTopic(n, lookup.topic) {
hash := query(n, lookup.topic)
s.addTopicQuery(common.BytesToHash(hash), n, lookup)
}
//}
}
}
}
func (s *ticketStore) adjustWithTicket(now mclock.AbsTime, targetHash common.Hash, t *ticket) {
for i, topic := range t.topics {
if tt, ok := s.radius[topic]; ok {
tt.adjustWithTicket(now, targetHash, ticketRef{t, i})
}
}
}
func (s *ticketStore) addTicket(localTime mclock.AbsTime, pingHash []byte, t *ticket) {
debugLog(fmt.Sprintf("add(node = %x sn = %v)", t.node.ID[:8], t.serial))
lastReq, ok := s.nodeLastReq[t.node]
if !(ok && bytes.Equal(pingHash, lastReq.pingHash)) {
return
}
s.adjustWithTicket(localTime, lastReq.lookup.target, t)
if lastReq.lookup.radiusLookup || s.nodes[t.node] != nil {
return
}
topic := lastReq.lookup.topic
topicIdx := t.findIdx(topic)
if topicIdx == -1 {
return
}
bucket := timeBucket(localTime / mclock.AbsTime(ticketTimeBucketLen))
if s.lastBucketFetched == 0 || bucket < s.lastBucketFetched {
s.lastBucketFetched = bucket
}
if _, ok := s.tickets[topic]; ok {
wait := t.regTime[topicIdx] - localTime
rnd := rand.ExpFloat64()
if rnd > 10 {
rnd = 10
}
if float64(wait) < float64(keepTicketConst)+float64(keepTicketExp)*rnd {
// use the ticket to register this topic
//fmt.Println("addTicket", t.node.ID[:8], t.node.addr().String(), t.serial, t.pong)
s.addTicketRef(ticketRef{t, topicIdx})
}
}
if t.refCnt > 0 {
s.nextTicketCached = nil
s.nodes[t.node] = t
}
}
func (s *ticketStore) getNodeTicket(node *Node) *ticket {
if s.nodes[node] == nil {
debugLog(fmt.Sprintf("getNodeTicket(%x) sn = nil", node.ID[:8]))
} else {
debugLog(fmt.Sprintf("getNodeTicket(%x) sn = %v", node.ID[:8], s.nodes[node].serial))
}
return s.nodes[node]
}
func (s *ticketStore) canQueryTopic(node *Node, topic Topic) bool {
qq := s.queriesSent[node]
if qq != nil {
now := mclock.Now()
for _, sq := range qq {
if sq.lookup.topic == topic && sq.sent > now-mclock.AbsTime(topicQueryResend) {
return false
}
}
}
return true
}
func (s *ticketStore) addTopicQuery(hash common.Hash, node *Node, lookup lookupInfo) {
now := mclock.Now()
qq := s.queriesSent[node]
if qq == nil {
qq = make(map[common.Hash]sentQuery)
s.queriesSent[node] = qq
}
qq[hash] = sentQuery{sent: now, lookup: lookup}
s.cleanupTopicQueries(now)
}
func (s *ticketStore) cleanupTopicQueries(now mclock.AbsTime) {
if s.nextTopicQueryCleanup > now {
return
}
exp := now - mclock.AbsTime(topicQueryResend)
for n, qq := range s.queriesSent {
for h, q := range qq {
if q.sent < exp {
delete(qq, h)
}
}
if len(qq) == 0 {
delete(s.queriesSent, n)
}
}
s.nextTopicQueryCleanup = now + mclock.AbsTime(topicQueryTimeout)
}
func (s *ticketStore) gotTopicNodes(from *Node, hash common.Hash, nodes []rpcNode) (timeout bool) {
now := mclock.Now()
//fmt.Println("got", from.addr().String(), hash, len(nodes))
qq := s.queriesSent[from]
if qq == nil {
return true
}
q, ok := qq[hash]
if !ok || now > q.sent+mclock.AbsTime(topicQueryTimeout) {
return true
}
inside := float64(0)
if len(nodes) > 0 {
inside = 1
}
s.radius[q.lookup.topic].adjust(now, q.lookup.target, from.sha, inside)
chn := s.searchTopicMap[q.lookup.topic].foundChn
if chn == nil {
//fmt.Println("no channel")
return false
}
for _, node := range nodes {
ip := node.IP
if ip.IsUnspecified() || ip.IsLoopback() {
ip = from.IP
}
enode := NewNode(node.ID, ip, node.UDP-1, node.TCP-1).String() // subtract one from port while discv5 is running in test mode on UDPport+1
select {
case chn <- enode:
default:
return false
}
}
return false
}
type topicRadius struct {
topic Topic
topicHashPrefix uint64
radius, minRadius uint64
buckets []topicRadiusBucket
}
type topicRadiusEvent int
const (
trOutside topicRadiusEvent = iota
trInside
trNoAdjust
trCount
)
type topicRadiusBucket struct {
weights [trCount]float64
lastTime mclock.AbsTime
value float64
lookupSent map[common.Hash]mclock.AbsTime
}
func (b *topicRadiusBucket) update(now mclock.AbsTime) {
if now == b.lastTime {
return
}
exp := math.Exp(-float64(now-b.lastTime) / float64(radiusTC))
for i, w := range b.weights {
b.weights[i] = w * exp
}
b.lastTime = now
for target, tm := range b.lookupSent {
if now-tm > mclock.AbsTime(pingTimeout) {
b.weights[trNoAdjust] += 1
delete(b.lookupSent, target)
}
}
}
func (b *topicRadiusBucket) adjust(now mclock.AbsTime, inside float64) {
b.update(now)
if inside <= 0 {
b.weights[trOutside] += 1
} else {
if inside >= 1 {
b.weights[trInside] += 1
} else {
b.weights[trInside] += inside
b.weights[trOutside] += 1 - inside
}
}
}
func newTopicRadius(t Topic) *topicRadius {
topicHash := crypto.Keccak256Hash([]byte(t))
topicHashPrefix := binary.BigEndian.Uint64(topicHash[0:8])
return &topicRadius{
topic: t,
topicHashPrefix: topicHashPrefix,
radius: maxRadius,
minRadius: maxRadius,
}
}
func (r *topicRadius) getBucketIdx(addrHash common.Hash) int {
prefix := binary.BigEndian.Uint64(addrHash[0:8])
var log2 float64
if prefix != r.topicHashPrefix {
log2 = math.Log2(float64(prefix ^ r.topicHashPrefix))
}
bucket := int((64 - log2) * radiusBucketsPerBit)
max := 64*radiusBucketsPerBit - 1
if bucket > max {
return max
}
if bucket < 0 {
return 0
}
return bucket
}
func (r *topicRadius) targetForBucket(bucket int) common.Hash {
min := math.Pow(2, 64-float64(bucket+1)/radiusBucketsPerBit)
max := math.Pow(2, 64-float64(bucket)/radiusBucketsPerBit)
a := uint64(min)
b := randUint64n(uint64(max - min))
xor := a + b
if xor < a {
xor = ^uint64(0)
}
prefix := r.topicHashPrefix ^ xor
var target common.Hash
binary.BigEndian.PutUint64(target[0:8], prefix)
rand.Read(target[8:])
return target
}
func (r *topicRadius) isInRadius(addrHash common.Hash) bool {
nodePrefix := binary.BigEndian.Uint64(addrHash[0:8])
dist := nodePrefix ^ r.topicHashPrefix
return dist < r.radius
}
func (r *topicRadius) chooseLookupBucket(a, b int) int {
if a < 0 {
a = 0
}
if a > b {
return -1
}
c := 0
for i := a; i <= b; i++ {
if i >= len(r.buckets) || r.buckets[i].weights[trNoAdjust] < maxNoAdjust {
c++
}
}
if c == 0 {
return -1
}
rnd := randUint(uint32(c))
for i := a; i <= b; i++ {
if i >= len(r.buckets) || r.buckets[i].weights[trNoAdjust] < maxNoAdjust {
if rnd == 0 {
return i
}
rnd--
}
}
panic(nil) // should never happen
}
func (r *topicRadius) needMoreLookups(a, b int, maxValue float64) bool {
var max float64
if a < 0 {
a = 0
}
if b >= len(r.buckets) {
b = len(r.buckets) - 1
if r.buckets[b].value > max {
max = r.buckets[b].value
}
}
if b >= a {
for i := a; i <= b; i++ {
if r.buckets[i].value > max {
max = r.buckets[i].value
}
}
}
return maxValue-max < minPeakSize
}
func (r *topicRadius) recalcRadius() (radius uint64, radiusLookup int) {
maxBucket := 0
maxValue := float64(0)
now := mclock.Now()
v := float64(0)
for i, _ := range r.buckets {
r.buckets[i].update(now)
v += r.buckets[i].weights[trOutside] - r.buckets[i].weights[trInside]
r.buckets[i].value = v
//fmt.Printf("%v %v | ", v, r.buckets[i].weights[trNoAdjust])
}
//fmt.Println()
slopeCross := -1
for i, b := range r.buckets {
v := b.value
if v < float64(i)*minSlope {
slopeCross = i
break
}
if v > maxValue {
maxValue = v
maxBucket = i + 1
}
}
minRadBucket := len(r.buckets)
sum := float64(0)
for minRadBucket > 0 && sum < minRightSum {
minRadBucket--
b := r.buckets[minRadBucket]
sum += b.weights[trInside] + b.weights[trOutside]
}
r.minRadius = uint64(math.Pow(2, 64-float64(minRadBucket)/radiusBucketsPerBit))
lookupLeft := -1
if r.needMoreLookups(0, maxBucket-lookupWidth-1, maxValue) {
lookupLeft = r.chooseLookupBucket(maxBucket-lookupWidth, maxBucket-1)
}
lookupRight := -1
if slopeCross != maxBucket && (minRadBucket <= maxBucket || r.needMoreLookups(maxBucket+lookupWidth, len(r.buckets)-1, maxValue)) {
for len(r.buckets) <= maxBucket+lookupWidth {
r.buckets = append(r.buckets, topicRadiusBucket{lookupSent: make(map[common.Hash]mclock.AbsTime)})
}
lookupRight = r.chooseLookupBucket(maxBucket, maxBucket+lookupWidth-1)
}
if lookupLeft == -1 {
radiusLookup = lookupRight
} else {
if lookupRight == -1 {
radiusLookup = lookupLeft
} else {
if randUint(2) == 0 {
radiusLookup = lookupLeft
} else {
radiusLookup = lookupRight
}
}
}
//fmt.Println("mb", maxBucket, "sc", slopeCross, "mrb", minRadBucket, "ll", lookupLeft, "lr", lookupRight, "mv", maxValue)
if radiusLookup == -1 {
// no more radius lookups needed at the moment, return a radius
rad := maxBucket
if minRadBucket < rad {
rad = minRadBucket
}
radius = ^uint64(0)
if rad > 0 {
radius = uint64(math.Pow(2, 64-float64(rad)/radiusBucketsPerBit))
}
r.radius = radius
}
return
}
func (r *topicRadius) nextTarget(forceRegular bool) lookupInfo {
if !forceRegular {
_, radiusLookup := r.recalcRadius()
if radiusLookup != -1 {
target := r.targetForBucket(radiusLookup)
r.buckets[radiusLookup].lookupSent[target] = mclock.Now()
return lookupInfo{target: target, topic: r.topic, radiusLookup: true}
}
}
radExt := r.radius / 2
if radExt > maxRadius-r.radius {
radExt = maxRadius - r.radius
}
rnd := randUint64n(r.radius) + randUint64n(2*radExt)
if rnd > radExt {
rnd -= radExt
} else {
rnd = radExt - rnd
}
prefix := r.topicHashPrefix ^ rnd
var target common.Hash
binary.BigEndian.PutUint64(target[0:8], prefix)
rand.Read(target[8:])
return lookupInfo{target: target, topic: r.topic, radiusLookup: false}
}
func (r *topicRadius) adjustWithTicket(now mclock.AbsTime, targetHash common.Hash, t ticketRef) {
wait := t.t.regTime[t.idx] - t.t.issueTime
inside := float64(wait)/float64(targetWaitTime) - 0.5
if inside > 1 {
inside = 1
}
if inside < 0 {
inside = 0
}
r.adjust(now, targetHash, t.t.node.sha, inside)
}
func (r *topicRadius) adjust(now mclock.AbsTime, targetHash, addrHash common.Hash, inside float64) {
bucket := r.getBucketIdx(addrHash)
//fmt.Println("adjust", bucket, len(r.buckets), inside)
if bucket >= len(r.buckets) {
return
}
r.buckets[bucket].adjust(now, inside)
delete(r.buckets[bucket].lookupSent, targetHash)
}

406
p2p/discv5/topic.go Normal file
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@ -0,0 +1,406 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"container/heap"
"fmt"
"math"
"math/rand"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
)
const (
maxEntries = 10000
maxEntriesPerTopic = 50
fallbackRegistrationExpiry = 1 * time.Hour
)
type Topic string
type topicEntry struct {
topic Topic
fifoIdx uint64
node *Node
expire mclock.AbsTime
}
type topicInfo struct {
entries map[uint64]*topicEntry
fifoHead, fifoTail uint64
rqItem *topicRequestQueueItem
wcl waitControlLoop
}
// removes tail element from the fifo
func (t *topicInfo) getFifoTail() *topicEntry {
for t.entries[t.fifoTail] == nil {
t.fifoTail++
}
tail := t.entries[t.fifoTail]
t.fifoTail++
return tail
}
type nodeInfo struct {
entries map[Topic]*topicEntry
lastIssuedTicket, lastUsedTicket uint32
// you can't register a ticket newer than lastUsedTicket before noRegUntil (absolute time)
noRegUntil mclock.AbsTime
}
type topicTable struct {
db *nodeDB
self *Node
nodes map[*Node]*nodeInfo
topics map[Topic]*topicInfo
globalEntries uint64
requested topicRequestQueue
requestCnt uint64
lastGarbageCollection mclock.AbsTime
}
func newTopicTable(db *nodeDB, self *Node) *topicTable {
if printTestImgLogs {
fmt.Printf("*N %016x\n", self.sha[:8])
}
return &topicTable{
db: db,
nodes: make(map[*Node]*nodeInfo),
topics: make(map[Topic]*topicInfo),
self: self,
}
}
func (t *topicTable) getOrNewTopic(topic Topic) *topicInfo {
ti := t.topics[topic]
if ti == nil {
rqItem := &topicRequestQueueItem{
topic: topic,
priority: t.requestCnt,
}
ti = &topicInfo{
entries: make(map[uint64]*topicEntry),
rqItem: rqItem,
}
t.topics[topic] = ti
heap.Push(&t.requested, rqItem)
}
return ti
}
func (t *topicTable) checkDeleteTopic(topic Topic) {
ti := t.topics[topic]
if ti == nil {
return
}
if len(ti.entries) == 0 && ti.wcl.hasMinimumWaitPeriod() {
delete(t.topics, topic)
heap.Remove(&t.requested, ti.rqItem.index)
}
}
func (t *topicTable) getOrNewNode(node *Node) *nodeInfo {
n := t.nodes[node]
if n == nil {
//fmt.Printf("newNode %016x %016x\n", t.self.sha[:8], node.sha[:8])
var issued, used uint32
if t.db != nil {
issued, used = t.db.fetchTopicRegTickets(node.ID)
}
n = &nodeInfo{
entries: make(map[Topic]*topicEntry),
lastIssuedTicket: issued,
lastUsedTicket: used,
}
t.nodes[node] = n
}
return n
}
func (t *topicTable) checkDeleteNode(node *Node) {
if n, ok := t.nodes[node]; ok && len(n.entries) == 0 && n.noRegUntil < mclock.Now() {
//fmt.Printf("deleteNode %016x %016x\n", t.self.sha[:8], node.sha[:8])
delete(t.nodes, node)
}
}
func (t *topicTable) storeTicketCounters(node *Node) {
n := t.getOrNewNode(node)
if t.db != nil {
t.db.updateTopicRegTickets(node.ID, n.lastIssuedTicket, n.lastUsedTicket)
}
}
func (t *topicTable) getEntries(topic Topic) []*Node {
t.collectGarbage()
te := t.topics[topic]
if te == nil {
return nil
}
nodes := make([]*Node, len(te.entries))
i := 0
for _, e := range te.entries {
nodes[i] = e.node
i++
}
t.requestCnt++
t.requested.update(te.rqItem, t.requestCnt)
return nodes
}
func (t *topicTable) addEntry(node *Node, topic Topic) {
n := t.getOrNewNode(node)
// clear previous entries by the same node
for _, e := range n.entries {
t.deleteEntry(e)
}
// ***
n = t.getOrNewNode(node)
tm := mclock.Now()
te := t.getOrNewTopic(topic)
if len(te.entries) == maxEntriesPerTopic {
t.deleteEntry(te.getFifoTail())
}
if t.globalEntries == maxEntries {
t.deleteEntry(t.leastRequested()) // not empty, no need to check for nil
}
fifoIdx := te.fifoHead
te.fifoHead++
entry := &topicEntry{
topic: topic,
fifoIdx: fifoIdx,
node: node,
expire: tm + mclock.AbsTime(fallbackRegistrationExpiry),
}
if printTestImgLogs {
fmt.Printf("*+ %d %v %016x %016x\n", tm/1000000, topic, t.self.sha[:8], node.sha[:8])
}
te.entries[fifoIdx] = entry
n.entries[topic] = entry
t.globalEntries++
te.wcl.registered(tm)
}
// removes least requested element from the fifo
func (t *topicTable) leastRequested() *topicEntry {
for t.requested.Len() > 0 && t.topics[t.requested[0].topic] == nil {
heap.Pop(&t.requested)
}
if t.requested.Len() == 0 {
return nil
}
return t.topics[t.requested[0].topic].getFifoTail()
}
// entry should exist
func (t *topicTable) deleteEntry(e *topicEntry) {
if printTestImgLogs {
fmt.Printf("*- %d %v %016x %016x\n", mclock.Now()/1000000, e.topic, t.self.sha[:8], e.node.sha[:8])
}
ne := t.nodes[e.node].entries
delete(ne, e.topic)
if len(ne) == 0 {
t.checkDeleteNode(e.node)
}
te := t.topics[e.topic]
delete(te.entries, e.fifoIdx)
if len(te.entries) == 0 {
t.checkDeleteTopic(e.topic)
}
t.globalEntries--
}
// It is assumed that topics and waitPeriods have the same length.
func (t *topicTable) useTicket(node *Node, serialNo uint32, topics []Topic, idx int, issueTime uint64, waitPeriods []uint32) (registered bool) {
debugLog(fmt.Sprintf("useTicket %v %v %v", serialNo, topics, waitPeriods))
//fmt.Println("useTicket", serialNo, topics, waitPeriods)
t.collectGarbage()
n := t.getOrNewNode(node)
if serialNo < n.lastUsedTicket {
return false
}
tm := mclock.Now()
if serialNo > n.lastUsedTicket && tm < n.noRegUntil {
return false
}
if serialNo != n.lastUsedTicket {
n.lastUsedTicket = serialNo
n.noRegUntil = tm + mclock.AbsTime(noRegTimeout())
t.storeTicketCounters(node)
}
currTime := uint64(tm / mclock.AbsTime(time.Second))
regTime := issueTime + uint64(waitPeriods[idx])
relTime := int64(currTime - regTime)
if relTime >= -1 && relTime <= regTimeWindow+1 { // give clients a little security margin on both ends
if e := n.entries[topics[idx]]; e == nil {
t.addEntry(node, topics[idx])
} else {
// if there is an active entry, don't move to the front of the FIFO but prolong expire time
e.expire = tm + mclock.AbsTime(fallbackRegistrationExpiry)
}
return true
}
return false
}
func (topictab *topicTable) getTicket(node *Node, topics []Topic) *ticket {
topictab.collectGarbage()
now := mclock.Now()
n := topictab.getOrNewNode(node)
n.lastIssuedTicket++
topictab.storeTicketCounters(node)
t := &ticket{
issueTime: now,
topics: topics,
serial: n.lastIssuedTicket,
regTime: make([]mclock.AbsTime, len(topics)),
}
for i, topic := range topics {
var waitPeriod time.Duration
if topic := topictab.topics[topic]; topic != nil {
waitPeriod = topic.wcl.waitPeriod
} else {
waitPeriod = minWaitPeriod
}
t.regTime[i] = now + mclock.AbsTime(waitPeriod)
}
return t
}
const gcInterval = time.Minute
func (t *topicTable) collectGarbage() {
tm := mclock.Now()
if time.Duration(tm-t.lastGarbageCollection) < gcInterval {
return
}
t.lastGarbageCollection = tm
for node, n := range t.nodes {
for _, e := range n.entries {
if e.expire <= tm {
t.deleteEntry(e)
}
}
t.checkDeleteNode(node)
}
for topic, _ := range t.topics {
t.checkDeleteTopic(topic)
}
}
const (
minWaitPeriod = time.Minute
regTimeWindow = 10 // seconds
avgnoRegTimeout = time.Minute * 10
// target average interval between two incoming ad requests
wcTargetRegInterval = time.Minute * 10 / maxEntriesPerTopic
//
wcTimeConst = time.Minute * 10
)
// initialization is not required, will set to minWaitPeriod at first registration
type waitControlLoop struct {
lastIncoming mclock.AbsTime
waitPeriod time.Duration
}
func (w *waitControlLoop) registered(tm mclock.AbsTime) {
w.waitPeriod = w.nextWaitPeriod(tm)
w.lastIncoming = tm
}
func (w *waitControlLoop) nextWaitPeriod(tm mclock.AbsTime) time.Duration {
period := tm - w.lastIncoming
wp := time.Duration(float64(w.waitPeriod) * math.Exp((float64(wcTargetRegInterval)-float64(period))/float64(wcTimeConst)))
if wp < minWaitPeriod {
wp = minWaitPeriod
}
return wp
}
func (w *waitControlLoop) hasMinimumWaitPeriod() bool {
return w.nextWaitPeriod(mclock.Now()) == minWaitPeriod
}
func noRegTimeout() time.Duration {
e := rand.ExpFloat64()
if e > 100 {
e = 100
}
return time.Duration(float64(avgnoRegTimeout) * e)
}
type topicRequestQueueItem struct {
topic Topic
priority uint64
index int
}
// A topicRequestQueue implements heap.Interface and holds topicRequestQueueItems.
type topicRequestQueue []*topicRequestQueueItem
func (tq topicRequestQueue) Len() int { return len(tq) }
func (tq topicRequestQueue) Less(i, j int) bool {
return tq[i].priority < tq[j].priority
}
func (tq topicRequestQueue) Swap(i, j int) {
tq[i], tq[j] = tq[j], tq[i]
tq[i].index = i
tq[j].index = j
}
func (tq *topicRequestQueue) Push(x interface{}) {
n := len(*tq)
item := x.(*topicRequestQueueItem)
item.index = n
*tq = append(*tq, item)
}
func (tq *topicRequestQueue) Pop() interface{} {
old := *tq
n := len(old)
item := old[n-1]
item.index = -1
*tq = old[0 : n-1]
return item
}
func (tq *topicRequestQueue) update(item *topicRequestQueueItem, priority uint64) {
item.priority = priority
heap.Fix(tq, item.index)
}

71
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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"encoding/binary"
"testing"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/mclock"
)
func TestTopicRadius(t *testing.T) {
now := mclock.Now()
topic := Topic("qwerty")
rad := newTopicRadius(topic)
targetRad := (^uint64(0)) / 100
waitFn := func(addr common.Hash) time.Duration {
prefix := binary.BigEndian.Uint64(addr[0:8])
dist := prefix ^ rad.topicHashPrefix
relDist := float64(dist) / float64(targetRad)
relTime := (1 - relDist/2) * 2
if relTime < 0 {
relTime = 0
}
return time.Duration(float64(targetWaitTime) * relTime)
}
bcnt := 0
cnt := 0
var sum float64
for cnt < 100 {
addr := rad.nextTarget(false).target
wait := waitFn(addr)
ticket := &ticket{
topics: []Topic{topic},
regTime: []mclock.AbsTime{mclock.AbsTime(wait)},
node: &Node{nodeNetGuts: nodeNetGuts{sha: addr}},
}
rad.adjustWithTicket(now, addr, ticketRef{ticket, 0})
if rad.radius != maxRadius {
cnt++
sum += float64(rad.radius)
} else {
bcnt++
if bcnt > 500 {
t.Errorf("Radius did not converge in 500 iterations")
}
}
}
avgRel := sum / float64(cnt) / float64(targetRad)
if avgRel > 1.05 || avgRel < 0.95 {
t.Errorf("Average/target ratio is too far from 1 (%v)", avgRel)
}
}

456
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// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"bytes"
"crypto/ecdsa"
"errors"
"fmt"
"net"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/rlp"
)
const Version = 4
// Errors
var (
errPacketTooSmall = errors.New("too small")
errBadHash = errors.New("bad hash")
errExpired = errors.New("expired")
errUnsolicitedReply = errors.New("unsolicited reply")
errUnknownNode = errors.New("unknown node")
errTimeout = errors.New("RPC timeout")
errClockWarp = errors.New("reply deadline too far in the future")
errClosed = errors.New("socket closed")
)
// Timeouts
const (
respTimeout = 500 * time.Millisecond
sendTimeout = 500 * time.Millisecond
expiration = 20 * time.Second
ntpFailureThreshold = 32 // Continuous timeouts after which to check NTP
ntpWarningCooldown = 10 * time.Minute // Minimum amount of time to pass before repeating NTP warning
driftThreshold = 10 * time.Second // Allowed clock drift before warning user
)
// RPC request structures
type (
ping struct {
Version uint
From, To rpcEndpoint
Expiration uint64
// v5
Topics []Topic
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
// pong is the reply to ping.
pong struct {
// This field should mirror the UDP envelope address
// of the ping packet, which provides a way to discover the
// the external address (after NAT).
To rpcEndpoint
ReplyTok []byte // This contains the hash of the ping packet.
Expiration uint64 // Absolute timestamp at which the packet becomes invalid.
// v5
TopicHash common.Hash
TicketSerial uint32
WaitPeriods []uint32
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
// findnode is a query for nodes close to the given target.
findnode struct {
Target NodeID // doesn't need to be an actual public key
Expiration uint64
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
// findnode is a query for nodes close to the given target.
findnodeHash struct {
Target common.Hash
Expiration uint64
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
// reply to findnode
neighbors struct {
Nodes []rpcNode
Expiration uint64
// Ignore additional fields (for forward compatibility).
Rest []rlp.RawValue `rlp:"tail"`
}
topicRegister struct {
Topics []Topic
Idx uint
Pong []byte
}
topicQuery struct {
Topic Topic
Expiration uint64
}
// reply to topicQuery
topicNodes struct {
Echo common.Hash
Nodes []rpcNode
}
rpcNode struct {
IP net.IP // len 4 for IPv4 or 16 for IPv6
UDP uint16 // for discovery protocol
TCP uint16 // for RLPx protocol
ID NodeID
}
rpcEndpoint struct {
IP net.IP // len 4 for IPv4 or 16 for IPv6
UDP uint16 // for discovery protocol
TCP uint16 // for RLPx protocol
}
)
const (
macSize = 256 / 8
sigSize = 520 / 8
headSize = macSize + sigSize // space of packet frame data
)
// Neighbors replies are sent across multiple packets to
// stay below the 1280 byte limit. We compute the maximum number
// of entries by stuffing a packet until it grows too large.
var maxNeighbors = func() int {
p := neighbors{Expiration: ^uint64(0)}
maxSizeNode := rpcNode{IP: make(net.IP, 16), UDP: ^uint16(0), TCP: ^uint16(0)}
for n := 0; ; n++ {
p.Nodes = append(p.Nodes, maxSizeNode)
size, _, err := rlp.EncodeToReader(p)
if err != nil {
// If this ever happens, it will be caught by the unit tests.
panic("cannot encode: " + err.Error())
}
if headSize+size+1 >= 1280 {
return n
}
}
}()
var maxTopicNodes = func() int {
p := topicNodes{}
maxSizeNode := rpcNode{IP: make(net.IP, 16), UDP: ^uint16(0), TCP: ^uint16(0)}
for n := 0; ; n++ {
p.Nodes = append(p.Nodes, maxSizeNode)
size, _, err := rlp.EncodeToReader(p)
if err != nil {
// If this ever happens, it will be caught by the unit tests.
panic("cannot encode: " + err.Error())
}
if headSize+size+1 >= 1280 {
return n
}
}
}()
func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
ip := addr.IP.To4()
if ip == nil {
ip = addr.IP.To16()
}
return rpcEndpoint{IP: ip, UDP: uint16(addr.Port), TCP: tcpPort}
}
func (e1 rpcEndpoint) equal(e2 rpcEndpoint) bool {
return e1.UDP == e2.UDP && e1.TCP == e2.TCP && bytes.Equal(e1.IP, e2.IP)
}
func nodeFromRPC(rn rpcNode) (*Node, error) {
// TODO: don't accept localhost, LAN addresses from internet hosts
n := NewNode(rn.ID, rn.IP, rn.UDP, rn.TCP)
err := n.validateComplete()
return n, err
}
func nodeToRPC(n *Node) rpcNode {
return rpcNode{ID: n.ID, IP: n.IP, UDP: n.UDP, TCP: n.TCP}
}
type ingressPacket struct {
remoteID NodeID
remoteAddr *net.UDPAddr
ev nodeEvent
hash []byte
data interface{} // one of the RPC structs
rawData []byte
}
type conn interface {
ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error)
WriteToUDP(b []byte, addr *net.UDPAddr) (n int, err error)
Close() error
LocalAddr() net.Addr
}
// udp implements the RPC protocol.
type udp struct {
conn conn
priv *ecdsa.PrivateKey
ourEndpoint rpcEndpoint
nat nat.Interface
net *Network
}
// ListenUDP returns a new table that listens for UDP packets on laddr.
func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string) (*Network, error) {
transport, err := listenUDP(priv, laddr)
if err != nil {
return nil, err
}
net, err := newNetwork(transport, priv.PublicKey, natm, nodeDBPath)
if err != nil {
return nil, err
}
transport.net = net
go transport.readLoop()
return net, nil
}
func listenUDP(priv *ecdsa.PrivateKey, laddr string) (*udp, error) {
addr, err := net.ResolveUDPAddr("udp", laddr)
if err != nil {
return nil, err
}
conn, err := net.ListenUDP("udp", addr)
if err != nil {
return nil, err
}
return &udp{conn: conn, priv: priv, ourEndpoint: makeEndpoint(addr, uint16(addr.Port))}, nil
}
func (t *udp) localAddr() *net.UDPAddr {
return t.conn.LocalAddr().(*net.UDPAddr)
}
func (t *udp) Close() {
t.conn.Close()
}
func (t *udp) send(remote *Node, ptype nodeEvent, data interface{}) (hash []byte) {
hash, _ = t.sendPacket(remote.ID, remote.addr(), byte(ptype), data)
return hash
}
func (t *udp) sendPing(remote *Node, toaddr *net.UDPAddr, topics []Topic) (hash []byte) {
hash, _ = t.sendPacket(remote.ID, toaddr, byte(pingPacket), ping{
Version: Version,
From: t.ourEndpoint,
To: makeEndpoint(toaddr, uint16(toaddr.Port)), // TODO: maybe use known TCP port from DB
Expiration: uint64(time.Now().Add(expiration).Unix()),
Topics: topics,
})
return hash
}
func (t *udp) sendFindnode(remote *Node, target NodeID) {
t.sendPacket(remote.ID, remote.addr(), byte(findnodePacket), findnode{
Target: target,
Expiration: uint64(time.Now().Add(expiration).Unix()),
})
}
func (t *udp) sendNeighbours(remote *Node, results []*Node) {
// Send neighbors in chunks with at most maxNeighbors per packet
// to stay below the 1280 byte limit.
p := neighbors{Expiration: uint64(time.Now().Add(expiration).Unix())}
for i, result := range results {
p.Nodes = append(p.Nodes, nodeToRPC(result))
if len(p.Nodes) == maxNeighbors || i == len(results)-1 {
t.sendPacket(remote.ID, remote.addr(), byte(neighborsPacket), p)
p.Nodes = p.Nodes[:0]
}
}
}
func (t *udp) sendFindnodeHash(remote *Node, target common.Hash) {
t.sendPacket(remote.ID, remote.addr(), byte(findnodeHashPacket), findnodeHash{
Target: target,
Expiration: uint64(time.Now().Add(expiration).Unix()),
})
}
func (t *udp) sendTopicRegister(remote *Node, topics []Topic, idx int, pong []byte) {
t.sendPacket(remote.ID, remote.addr(), byte(topicRegisterPacket), topicRegister{
Topics: topics,
Idx: uint(idx),
Pong: pong,
})
}
func (t *udp) sendTopicNodes(remote *Node, queryHash common.Hash, nodes []*Node) {
p := topicNodes{Echo: queryHash}
if len(nodes) == 0 {
t.sendPacket(remote.ID, remote.addr(), byte(topicNodesPacket), p)
return
}
for i, result := range nodes {
p.Nodes = append(p.Nodes, nodeToRPC(result))
if len(p.Nodes) == maxTopicNodes || i == len(nodes)-1 {
t.sendPacket(remote.ID, remote.addr(), byte(topicNodesPacket), p)
p.Nodes = p.Nodes[:0]
}
}
}
func (t *udp) sendPacket(toid NodeID, toaddr *net.UDPAddr, ptype byte, req interface{}) (hash []byte, err error) {
packet, hash, err := encodePacket(t.priv, ptype, req)
if err != nil {
return hash, err
}
glog.V(logger.Detail).Infof(">>> %v to %x@%v\n", nodeEvent(ptype), toid[:8], toaddr)
if _, err = t.conn.WriteToUDP(packet, toaddr); err != nil {
glog.V(logger.Detail).Infoln("UDP send failed:", err)
}
return hash, err
}
// zeroed padding space for encodePacket.
var headSpace = make([]byte, headSize)
func encodePacket(priv *ecdsa.PrivateKey, ptype byte, req interface{}) (p, hash []byte, err error) {
b := new(bytes.Buffer)
b.Write(headSpace)
b.WriteByte(ptype)
if err := rlp.Encode(b, req); err != nil {
glog.V(logger.Error).Infoln("error encoding packet:", err)
return nil, nil, err
}
packet := b.Bytes()
sig, err := crypto.Sign(crypto.Keccak256(packet[headSize:]), priv)
if err != nil {
glog.V(logger.Error).Infoln("could not sign packet:", err)
return nil, nil, err
}
copy(packet[macSize:], sig)
// add the hash to the front. Note: this doesn't protect the
// packet in any way.
hash = crypto.Keccak256(packet[macSize:])
copy(packet, hash)
return packet, hash, nil
}
// readLoop runs in its own goroutine. it injects ingress UDP packets
// into the network loop.
func (t *udp) readLoop() {
defer t.conn.Close()
// Discovery packets are defined to be no larger than 1280 bytes.
// Packets larger than this size will be cut at the end and treated
// as invalid because their hash won't match.
buf := make([]byte, 1280)
for {
nbytes, from, err := t.conn.ReadFromUDP(buf)
if isTemporaryError(err) {
// Ignore temporary read errors.
glog.V(logger.Debug).Infof("Temporary read error: %v", err)
continue
} else if err != nil {
// Shut down the loop for permament errors.
glog.V(logger.Debug).Infof("Read error: %v", err)
return
}
t.handlePacket(from, buf[:nbytes])
}
}
func isTemporaryError(err error) bool {
tempErr, ok := err.(interface {
Temporary() bool
})
return ok && tempErr.Temporary() || isPacketTooBig(err)
}
func (t *udp) handlePacket(from *net.UDPAddr, buf []byte) error {
pkt := ingressPacket{remoteAddr: from}
if err := decodePacket(buf, &pkt); err != nil {
glog.V(logger.Debug).Infof("Bad packet from %v: %v\n", from, err)
return err
}
t.net.reqReadPacket(pkt)
return nil
}
func decodePacket(buffer []byte, pkt *ingressPacket) error {
if len(buffer) < headSize+1 {
return errPacketTooSmall
}
buf := make([]byte, len(buffer))
copy(buf, buffer)
hash, sig, sigdata := buf[:macSize], buf[macSize:headSize], buf[headSize:]
shouldhash := crypto.Keccak256(buf[macSize:])
if !bytes.Equal(hash, shouldhash) {
return errBadHash
}
fromID, err := recoverNodeID(crypto.Keccak256(buf[headSize:]), sig)
if err != nil {
return err
}
pkt.rawData = buf
pkt.hash = hash
pkt.remoteID = fromID
switch pkt.ev = nodeEvent(sigdata[0]); pkt.ev {
case pingPacket:
pkt.data = new(ping)
case pongPacket:
pkt.data = new(pong)
case findnodePacket:
pkt.data = new(findnode)
case neighborsPacket:
pkt.data = new(neighbors)
case findnodeHashPacket:
pkt.data = new(findnodeHash)
case topicRegisterPacket:
pkt.data = new(topicRegister)
case topicQueryPacket:
pkt.data = new(topicQuery)
case topicNodesPacket:
pkt.data = new(topicNodes)
default:
return fmt.Errorf("unknown packet type: %d", sigdata[0])
}
s := rlp.NewStream(bytes.NewReader(sigdata[1:]), 0)
err = s.Decode(pkt.data)
return err
}

26
p2p/discv5/udp_notwindows.go Normal file
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@ -0,0 +1,26 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//+build !windows
package discv5
// reports whether err indicates that a UDP packet didn't
// fit the receive buffer. There is no such error on
// non-Windows platforms.
func isPacketTooBig(err error) bool {
return false
}

505
p2p/discv5/udp_test.go Normal file
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@ -0,0 +1,505 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package discv5
import (
"encoding/hex"
"errors"
"io"
"net"
"reflect"
"sync"
"testing"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/rlp"
)
func init() {
spew.Config.DisableMethods = true
}
// This test checks that isPacketTooBig correctly identifies
// errors that result from receiving a UDP packet larger
// than the supplied receive buffer.
func TestIsPacketTooBig(t *testing.T) {
listener, err := net.ListenPacket("udp", "127.0.0.1:0")
if err != nil {
t.Fatal(err)
}
defer listener.Close()
sender, err := net.Dial("udp", listener.LocalAddr().String())
if err != nil {
t.Fatal(err)
}
defer sender.Close()
sendN := 1800
recvN := 300
for i := 0; i < 20; i++ {
go func() {
buf := make([]byte, sendN)
for i := range buf {
buf[i] = byte(i)
}
sender.Write(buf)
}()
buf := make([]byte, recvN)
listener.SetDeadline(time.Now().Add(1 * time.Second))
n, _, err := listener.ReadFrom(buf)
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Timeout() {
continue
}
if !isPacketTooBig(err) {
t.Fatal("unexpected read error:", spew.Sdump(err))
}
continue
}
if n != recvN {
t.Fatalf("short read: %d, want %d", n, recvN)
}
for i := range buf {
if buf[i] != byte(i) {
t.Fatalf("error in pattern")
break
}
}
}
}
// shared test variables
var (
futureExp = uint64(time.Now().Add(10 * time.Hour).Unix())
testTarget = NodeID{0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1}
testRemote = rpcEndpoint{IP: net.ParseIP("1.1.1.1").To4(), UDP: 1, TCP: 2}
testLocalAnnounced = rpcEndpoint{IP: net.ParseIP("2.2.2.2").To4(), UDP: 3, TCP: 4}
testLocal = rpcEndpoint{IP: net.ParseIP("3.3.3.3").To4(), UDP: 5, TCP: 6}
)
// type udpTest struct {
// t *testing.T
// pipe *dgramPipe
// table *Table
// udp *udp
// sent [][]byte
// localkey, remotekey *ecdsa.PrivateKey
// remoteaddr *net.UDPAddr
// }
//
// func newUDPTest(t *testing.T) *udpTest {
// test := &udpTest{
// t: t,
// pipe: newpipe(),
// localkey: newkey(),
// remotekey: newkey(),
// remoteaddr: &net.UDPAddr{IP: net.IP{1, 2, 3, 4}, Port: 30303},
// }
// test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "")
// return test
// }
//
// // handles a packet as if it had been sent to the transport.
// func (test *udpTest) packetIn(wantError error, ptype byte, data packet) error {
// enc, err := encodePacket(test.remotekey, ptype, data)
// if err != nil {
// return test.errorf("packet (%d) encode error: %v", ptype, err)
// }
// test.sent = append(test.sent, enc)
// if err = test.udp.handlePacket(test.remoteaddr, enc); err != wantError {
// return test.errorf("error mismatch: got %q, want %q", err, wantError)
// }
// return nil
// }
//
// // waits for a packet to be sent by the transport.
// // validate should have type func(*udpTest, X) error, where X is a packet type.
// func (test *udpTest) waitPacketOut(validate interface{}) error {
// dgram := test.pipe.waitPacketOut()
// p, _, _, err := decodePacket(dgram)
// if err != nil {
// return test.errorf("sent packet decode error: %v", err)
// }
// fn := reflect.ValueOf(validate)
// exptype := fn.Type().In(0)
// if reflect.TypeOf(p) != exptype {
// return test.errorf("sent packet type mismatch, got: %v, want: %v", reflect.TypeOf(p), exptype)
// }
// fn.Call([]reflect.Value{reflect.ValueOf(p)})
// return nil
// }
//
// func (test *udpTest) errorf(format string, args ...interface{}) error {
// _, file, line, ok := runtime.Caller(2) // errorf + waitPacketOut
// if ok {
// file = filepath.Base(file)
// } else {
// file = "???"
// line = 1
// }
// err := fmt.Errorf(format, args...)
// fmt.Printf("\t%s:%d: %v\n", file, line, err)
// test.t.Fail()
// return err
// }
//
// func TestUDP_packetErrors(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// test.packetIn(errExpired, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version})
// test.packetIn(errUnsolicitedReply, pongPacket, &pong{ReplyTok: []byte{}, Expiration: futureExp})
// test.packetIn(errUnknownNode, findnodePacket, &findnode{Expiration: futureExp})
// test.packetIn(errUnsolicitedReply, neighborsPacket, &neighbors{Expiration: futureExp})
// }
//
// func TestUDP_findnode(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// // put a few nodes into the table. their exact
// // distribution shouldn't matter much, altough we need to
// // take care not to overflow any bucket.
// targetHash := crypto.Keccak256Hash(testTarget[:])
// nodes := &nodesByDistance{target: targetHash}
// for i := 0; i < bucketSize; i++ {
// nodes.push(nodeAtDistance(test.table.self.sha, i+2), bucketSize)
// }
// test.table.stuff(nodes.entries)
//
// // ensure there's a bond with the test node,
// // findnode won't be accepted otherwise.
// test.table.db.updateNode(NewNode(
// PubkeyID(&test.remotekey.PublicKey),
// test.remoteaddr.IP,
// uint16(test.remoteaddr.Port),
// 99,
// ))
// // check that closest neighbors are returned.
// test.packetIn(nil, findnodePacket, &findnode{Target: testTarget, Expiration: futureExp})
// expected := test.table.closest(targetHash, bucketSize)
//
// waitNeighbors := func(want []*Node) {
// test.waitPacketOut(func(p *neighbors) {
// if len(p.Nodes) != len(want) {
// t.Errorf("wrong number of results: got %d, want %d", len(p.Nodes), bucketSize)
// }
// for i := range p.Nodes {
// if p.Nodes[i].ID != want[i].ID {
// t.Errorf("result mismatch at %d:\n got: %v\n want: %v", i, p.Nodes[i], expected.entries[i])
// }
// }
// })
// }
// waitNeighbors(expected.entries[:maxNeighbors])
// waitNeighbors(expected.entries[maxNeighbors:])
// }
//
// func TestUDP_findnodeMultiReply(t *testing.T) {
// test := newUDPTest(t)
// defer test.table.Close()
//
// // queue a pending findnode request
// resultc, errc := make(chan []*Node), make(chan error)
// go func() {
// rid := PubkeyID(&test.remotekey.PublicKey)
// ns, err := test.udp.findnode(rid, test.remoteaddr, testTarget)
// if err != nil && len(ns) == 0 {
// errc <- err
// } else {
// resultc <- ns
// }
// }()
//
// // wait for the findnode to be sent.
// // after it is sent, the transport is waiting for a reply
// test.waitPacketOut(func(p *findnode) {
// if p.Target != testTarget {
// t.Errorf("wrong target: got %v, want %v", p.Target, testTarget)
// }
// })
//
// // send the reply as two packets.
// list := []*Node{
// MustParseNode("enode://ba85011c70bcc5c04d8607d3a0ed29aa6179c092cbdda10d5d32684fb33ed01bd94f588ca8f91ac48318087dcb02eaf36773a7a453f0eedd6742af668097b29c@10.0.1.16:30303?discport=30304"),
// MustParseNode("enode://81fa361d25f157cd421c60dcc28d8dac5ef6a89476633339c5df30287474520caca09627da18543d9079b5b288698b542d56167aa5c09111e55acdbbdf2ef799@10.0.1.16:30303"),
// MustParseNode("enode://9bffefd833d53fac8e652415f4973bee289e8b1a5c6c4cbe70abf817ce8a64cee11b823b66a987f51aaa9fba0d6a91b3e6bf0d5a5d1042de8e9eeea057b217f8@10.0.1.36:30301?discport=17"),
// MustParseNode("enode://1b5b4aa662d7cb44a7221bfba67302590b643028197a7d5214790f3bac7aaa4a3241be9e83c09cf1f6c69d007c634faae3dc1b1221793e8446c0b3a09de65960@10.0.1.16:30303"),
// }
// rpclist := make([]rpcNode, len(list))
// for i := range list {
// rpclist[i] = nodeToRPC(list[i])
// }
// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[:2]})
// test.packetIn(nil, neighborsPacket, &neighbors{Expiration: futureExp, Nodes: rpclist[2:]})
//
// // check that the sent neighbors are all returned by findnode
// select {
// case result := <-resultc:
// if !reflect.DeepEqual(result, list) {
// t.Errorf("neighbors mismatch:\n got: %v\n want: %v", result, list)
// }
// case err := <-errc:
// t.Errorf("findnode error: %v", err)
// case <-time.After(5 * time.Second):
// t.Error("findnode did not return within 5 seconds")
// }
// }
//
// func TestUDP_successfulPing(t *testing.T) {
// test := newUDPTest(t)
// added := make(chan *Node, 1)
// test.table.nodeAddedHook = func(n *Node) { added <- n }
// defer test.table.Close()
//
// // The remote side sends a ping packet to initiate the exchange.
// go test.packetIn(nil, pingPacket, &ping{From: testRemote, To: testLocalAnnounced, Version: Version, Expiration: futureExp})
//
// // the ping is replied to.
// test.waitPacketOut(func(p *pong) {
// pinghash := test.sent[0][:macSize]
// if !bytes.Equal(p.ReplyTok, pinghash) {
// t.Errorf("got pong.ReplyTok %x, want %x", p.ReplyTok, pinghash)
// }
// wantTo := rpcEndpoint{
// // The mirrored UDP address is the UDP packet sender
// IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
// // The mirrored TCP port is the one from the ping packet
// TCP: testRemote.TCP,
// }
// if !reflect.DeepEqual(p.To, wantTo) {
// t.Errorf("got pong.To %v, want %v", p.To, wantTo)
// }
// })
//
// // remote is unknown, the table pings back.
// test.waitPacketOut(func(p *ping) error {
// if !reflect.DeepEqual(p.From, test.udp.ourEndpoint) {
// t.Errorf("got ping.From %v, want %v", p.From, test.udp.ourEndpoint)
// }
// wantTo := rpcEndpoint{
// // The mirrored UDP address is the UDP packet sender.
// IP: test.remoteaddr.IP, UDP: uint16(test.remoteaddr.Port),
// TCP: 0,
// }
// if !reflect.DeepEqual(p.To, wantTo) {
// t.Errorf("got ping.To %v, want %v", p.To, wantTo)
// }
// return nil
// })
// test.packetIn(nil, pongPacket, &pong{Expiration: futureExp})
//
// // the node should be added to the table shortly after getting the
// // pong packet.
// select {
// case n := <-added:
// rid := PubkeyID(&test.remotekey.PublicKey)
// if n.ID != rid {
// t.Errorf("node has wrong ID: got %v, want %v", n.ID, rid)
// }
// if !bytes.Equal(n.IP, test.remoteaddr.IP) {
// t.Errorf("node has wrong IP: got %v, want: %v", n.IP, test.remoteaddr.IP)
// }
// if int(n.UDP) != test.remoteaddr.Port {
// t.Errorf("node has wrong UDP port: got %v, want: %v", n.UDP, test.remoteaddr.Port)
// }
// if n.TCP != testRemote.TCP {
// t.Errorf("node has wrong TCP port: got %v, want: %v", n.TCP, testRemote.TCP)
// }
// case <-time.After(2 * time.Second):
// t.Errorf("node was not added within 2 seconds")
// }
// }
var testPackets = []struct {
input string
wantPacket interface{}
}{
{
input: "71dbda3a79554728d4f94411e42ee1f8b0d561c10e1e5f5893367948c6a7d70bb87b235fa28a77070271b6c164a2dce8c7e13a5739b53b5e96f2e5acb0e458a02902f5965d55ecbeb2ebb6cabb8b2b232896a36b737666c55265ad0a68412f250001ea04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a355",
wantPacket: &ping{
Version: 4,
From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
Expiration: 1136239445,
Rest: []rlp.RawValue{},
},
},
{
input: "e9614ccfd9fc3e74360018522d30e1419a143407ffcce748de3e22116b7e8dc92ff74788c0b6663aaa3d67d641936511c8f8d6ad8698b820a7cf9e1be7155e9a241f556658c55428ec0563514365799a4be2be5a685a80971ddcfa80cb422cdd0101ec04cb847f000001820cfa8215a8d790000000000000000000000000000000018208ae820d058443b9a3550102",
wantPacket: &ping{
Version: 4,
From: rpcEndpoint{net.ParseIP("127.0.0.1").To4(), 3322, 5544},
To: rpcEndpoint{net.ParseIP("::1"), 2222, 3333},
Expiration: 1136239445,
Rest: []rlp.RawValue{{0x01}, {0x02}},
},
},
{
input: "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",
wantPacket: &ping{
Version: 555,
From: rpcEndpoint{net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 3322, 5544},
To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
Expiration: 1136239445,
Rest: []rlp.RawValue{{0xC5, 0x01, 0x02, 0x03, 0x04, 0x05}},
},
},
{
input: "09b2428d83348d27cdf7064ad9024f526cebc19e4958f0fdad87c15eb598dd61d08423e0bf66b2069869e1724125f820d851c136684082774f870e614d95a2855d000f05d1648b2d5945470bc187c2d2216fbe870f43ed0909009882e176a46b0102f846d79020010db885a308d313198a2e037073488208ae82823aa0fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c9548443b9a355c6010203c2040506a0c969a58f6f9095004c0177a6b47f451530cab38966a25cca5cb58f055542124e",
wantPacket: &pong{
To: rpcEndpoint{net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"), 2222, 33338},
ReplyTok: common.Hex2Bytes("fbc914b16819237dcd8801d7e53f69e9719adecb3cc0e790c57e91ca4461c954"),
Expiration: 1136239445,
Rest: []rlp.RawValue{{0xC6, 0x01, 0x02, 0x03, 0xC2, 0x04, 0x05}, {0x06}},
},
},
{
input: "c7c44041b9f7c7e41934417ebac9a8e1a4c6298f74553f2fcfdcae6ed6fe53163eb3d2b52e39fe91831b8a927bf4fc222c3902202027e5e9eb812195f95d20061ef5cd31d502e47ecb61183f74a504fe04c51e73df81f25c4d506b26db4517490103f84eb840ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f8443b9a35582999983999999280dc62cc8255c73471e0a61da0c89acdc0e035e260add7fc0c04ad9ebf3919644c91cb247affc82b69bd2ca235c71eab8e49737c937a2c396",
wantPacket: &findnode{
Target: MustHexID("ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31387574077f301b421bc84df7266c44e9e6d569fc56be00812904767bf5ccd1fc7f"),
Expiration: 1136239445,
Rest: []rlp.RawValue{{0x82, 0x99, 0x99}, {0x83, 0x99, 0x99, 0x99}},
},
},
{
input: "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",
wantPacket: &neighbors{
Nodes: []rpcNode{
{
ID: MustHexID("3155e1427f85f10a5c9a7755877748041af1bcd8d474ec065eb33df57a97babf54bfd2103575fa829115d224c523596b401065a97f74010610fce76382c0bf32"),
IP: net.ParseIP("99.33.22.55").To4(),
UDP: 4444,
TCP: 4445,
},
{
ID: MustHexID("312c55512422cf9b8a4097e9a6ad79402e87a15ae909a4bfefa22398f03d20951933beea1e4dfa6f968212385e829f04c2d314fc2d4e255e0d3bc08792b069db"),
IP: net.ParseIP("1.2.3.4").To4(),
UDP: 1,
TCP: 1,
},
{
ID: MustHexID("38643200b172dcfef857492156971f0e6aa2c538d8b74010f8e140811d53b98c765dd2d96126051913f44582e8c199ad7c6d6819e9a56483f637feaac9448aac"),
IP: net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
UDP: 3333,
TCP: 3333,
},
{
ID: MustHexID("8dcab8618c3253b558d459da53bd8fa68935a719aff8b811197101a4b2b47dd2d47295286fc00cc081bb542d760717d1bdd6bec2c37cd72eca367d6dd3b9df73"),
IP: net.ParseIP("2001:db8:85a3:8d3:1319:8a2e:370:7348"),
UDP: 999,
TCP: 1000,
},
},
Expiration: 1136239445,
Rest: []rlp.RawValue{{0x01}, {0x02}, {0x03}},
},
},
}
func TestForwardCompatibility(t *testing.T) {
t.Skip("skipped while working on discovery v5")
testkey, _ := crypto.HexToECDSA("b71c71a67e1177ad4e901695e1b4b9ee17ae16c6668d313eac2f96dbcda3f291")
wantNodeID := PubkeyID(&testkey.PublicKey)
for _, test := range testPackets {
input, err := hex.DecodeString(test.input)
if err != nil {
t.Fatalf("invalid hex: %s", test.input)
}
var pkt ingressPacket
if err := decodePacket(input, &pkt); err != nil {
t.Errorf("did not accept packet %s\n%v", test.input, err)
continue
}
if !reflect.DeepEqual(pkt.data, test.wantPacket) {
t.Errorf("got %s\nwant %s", spew.Sdump(pkt.data), spew.Sdump(test.wantPacket))
}
if pkt.remoteID != wantNodeID {
t.Errorf("got id %v\nwant id %v", pkt.remoteID, wantNodeID)
}
}
}
// dgramPipe is a fake UDP socket. It queues all sent datagrams.
type dgramPipe struct {
mu *sync.Mutex
cond *sync.Cond
closing chan struct{}
closed bool
queue [][]byte
}
func newpipe() *dgramPipe {
mu := new(sync.Mutex)
return &dgramPipe{
closing: make(chan struct{}),
cond: &sync.Cond{L: mu},
mu: mu,
}
}
// WriteToUDP queues a datagram.
func (c *dgramPipe) WriteToUDP(b []byte, to *net.UDPAddr) (n int, err error) {
msg := make([]byte, len(b))
copy(msg, b)
c.mu.Lock()
defer c.mu.Unlock()
if c.closed {
return 0, errors.New("closed")
}
c.queue = append(c.queue, msg)
c.cond.Signal()
return len(b), nil
}
// ReadFromUDP just hangs until the pipe is closed.
func (c *dgramPipe) ReadFromUDP(b []byte) (n int, addr *net.UDPAddr, err error) {
<-c.closing
return 0, nil, io.EOF
}
func (c *dgramPipe) Close() error {
c.mu.Lock()
defer c.mu.Unlock()
if !c.closed {
close(c.closing)
c.closed = true
}
return nil
}
func (c *dgramPipe) LocalAddr() net.Addr {
return &net.UDPAddr{IP: testLocal.IP, Port: int(testLocal.UDP)}
}
func (c *dgramPipe) waitPacketOut() []byte {
c.mu.Lock()
defer c.mu.Unlock()
for len(c.queue) == 0 {
c.cond.Wait()
}
p := c.queue[0]
copy(c.queue, c.queue[1:])
c.queue = c.queue[:len(c.queue)-1]
return p
}

40
p2p/discv5/udp_windows.go Normal file
View File

@ -0,0 +1,40 @@
// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//+build windows
package discv5
import (
"net"
"os"
"syscall"
)
const _WSAEMSGSIZE = syscall.Errno(10040)
// reports whether err indicates that a UDP packet didn't
// fit the receive buffer. On Windows, WSARecvFrom returns
// code WSAEMSGSIZE and no data if this happens.
func isPacketTooBig(err error) bool {
if opErr, ok := err.(*net.OpError); ok {
if scErr, ok := opErr.Err.(*os.SyscallError); ok {
return scErr.Err == _WSAEMSGSIZE
}
return opErr.Err == _WSAEMSGSIZE
}
return false
}

20
p2p/server.go
View File

@ -28,6 +28,7 @@ import (
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/p2p/nat"
)
@ -72,6 +73,8 @@ type Config struct {
// or not. Disabling is usually useful for protocol debugging (manual topology).
Discovery bool
DiscoveryV5 bool
// Name sets the node name of this server.
// Use common.MakeName to create a name that follows existing conventions.
Name string
@ -105,6 +108,8 @@ type Config struct {
// the server is started.
ListenAddr string
ListenAddrV5 string
// If set to a non-nil value, the given NAT port mapper
// is used to make the listening port available to the
// Internet.
@ -135,6 +140,7 @@ type Server struct {
listener net.Listener
ourHandshake *protoHandshake
lastLookup time.Time
DiscV5 *discv5.Network
// These are for Peers, PeerCount (and nothing else).
peerOp chan peerOpFunc
@ -352,6 +358,17 @@ func (srv *Server) Start() (err error) {
srv.ntab = ntab
}
if srv.DiscoveryV5 {
ntab, err := discv5.ListenUDP(srv.PrivateKey, srv.ListenAddrV5, srv.NAT, "") //srv.NodeDatabase)
if err != nil {
return err
}
if err := ntab.SetFallbackNodes(discv5.BootNodes); err != nil {
return err
}
srv.DiscV5 = ntab
}
dynPeers := (srv.MaxPeers + 1) / 2
if !srv.Discovery {
dynPeers = 0
@ -527,6 +544,9 @@ running:
if srv.ntab != nil {
srv.ntab.Close()
}
if srv.DiscV5 != nil {
srv.DiscV5.Close()
}
// Disconnect all peers.
for _, p := range peers {
p.Disconnect(DiscQuitting)