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Merge branch 'feature/p2p-protocol-interface' of https://github.com/fjl/go-ethereum into fjl-feature/p2p-protocol-interface

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This commit is contained in:
obscuren 2014-12-05 16:27:11 +01:00
commit 384b8c75f0
22 changed files with 2073 additions and 2466 deletions
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6
p2p/client_identity.go
View File

@ -5,10 +5,10 @@ import (
"runtime" "runtime"
) )
// should be used in Peer handleHandshake, incorporate Caps, ProtocolVersion, Pubkey etc. // ClientIdentity represents the identity of a peer.
type ClientIdentity interface { type ClientIdentity interface {
String() string String() string // human readable identity
Pubkey() []byte Pubkey() []byte // 512-bit public key
} }
type SimpleClientIdentity struct { type SimpleClientIdentity struct {

275
p2p/connection.go
View File

@ -1,275 +0,0 @@
package p2p
import (
"bytes"
// "fmt"
"net"
"time"
"github.com/ethereum/go-ethereum/ethutil"
)
type Connection struct {
conn net.Conn
// conn NetworkConnection
timeout time.Duration
in chan []byte
out chan []byte
err chan *PeerError
closingIn chan chan bool
closingOut chan chan bool
}
// const readBufferLength = 2 //for testing
const readBufferLength = 1440
const partialsQueueSize = 10
const maxPendingQueueSize = 1
const defaultTimeout = 500
var magicToken = []byte{34, 64, 8, 145}
func (self *Connection) Open() {
go self.startRead()
go self.startWrite()
}
func (self *Connection) Close() {
self.closeIn()
self.closeOut()
}
func (self *Connection) closeIn() {
errc := make(chan bool)
self.closingIn <- errc
<-errc
}
func (self *Connection) closeOut() {
errc := make(chan bool)
self.closingOut <- errc
<-errc
}
func NewConnection(conn net.Conn, errchan chan *PeerError) *Connection {
return &Connection{
conn: conn,
timeout: defaultTimeout,
in: make(chan []byte),
out: make(chan []byte),
err: errchan,
closingIn: make(chan chan bool, 1),
closingOut: make(chan chan bool, 1),
}
}
func (self *Connection) Read() <-chan []byte {
return self.in
}
func (self *Connection) Write() chan<- []byte {
return self.out
}
func (self *Connection) Error() <-chan *PeerError {
return self.err
}
func (self *Connection) startRead() {
payloads := make(chan []byte)
done := make(chan *PeerError)
pending := [][]byte{}
var head []byte
var wait time.Duration // initally 0 (no delay)
read := time.After(wait * time.Millisecond)
for {
// if pending empty, nil channel blocks
var in chan []byte
if len(pending) > 0 {
in = self.in // enable send case
head = pending[0]
} else {
in = nil
}
select {
case <-read:
go self.read(payloads, done)
case err := <-done:
if err == nil { // no error but nothing to read
if len(pending) < maxPendingQueueSize {
wait = 100
} else if wait == 0 {
wait = 100
} else {
wait = 2 * wait
}
} else {
self.err <- err // report error
wait = 100
}
read = time.After(wait * time.Millisecond)
case payload := <-payloads:
pending = append(pending, payload)
if len(pending) < maxPendingQueueSize {
wait = 0
} else {
wait = 100
}
read = time.After(wait * time.Millisecond)
case in <- head:
pending = pending[1:]
case errc := <-self.closingIn:
errc <- true
close(self.in)
return
}
}
}
func (self *Connection) startWrite() {
pending := [][]byte{}
done := make(chan *PeerError)
writing := false
for {
if len(pending) > 0 && !writing {
writing = true
go self.write(pending[0], done)
}
select {
case payload := <-self.out:
pending = append(pending, payload)
case err := <-done:
if err == nil {
pending = pending[1:]
writing = false
} else {
self.err <- err // report error
}
case errc := <-self.closingOut:
errc <- true
close(self.out)
return
}
}
}
func pack(payload []byte) (packet []byte) {
length := ethutil.NumberToBytes(uint32(len(payload)), 32)
// return error if too long?
// Write magic token and payload length (first 8 bytes)
packet = append(magicToken, length...)
packet = append(packet, payload...)
return
}
func avoidPanic(done chan *PeerError) {
if rec := recover(); rec != nil {
err := NewPeerError(MiscError, " %v", rec)
logger.Debugln(err)
done <- err
}
}
func (self *Connection) write(payload []byte, done chan *PeerError) {
defer avoidPanic(done)
var err *PeerError
_, ok := self.conn.Write(pack(payload))
if ok != nil {
err = NewPeerError(WriteError, " %v", ok)
logger.Debugln(err)
}
done <- err
}
func (self *Connection) read(payloads chan []byte, done chan *PeerError) {
//defer avoidPanic(done)
partials := make(chan []byte, partialsQueueSize)
errc := make(chan *PeerError)
go self.readPartials(partials, errc)
packet := []byte{}
length := 8
start := true
var err *PeerError
out:
for {
// appends partials read via connection until packet is
// - either parseable (>=8bytes)
// - or complete (payload fully consumed)
for len(packet) < length {
partial, ok := <-partials
if !ok { // partials channel is closed
err = <-errc
if err == nil && len(packet) > 0 {
if start {
err = NewPeerError(PacketTooShort, "%v", packet)
} else {
err = NewPeerError(PayloadTooShort, "%d < %d", len(packet), length)
}
}
break out
}
packet = append(packet, partial...)
}
if start {
// at least 8 bytes read, can validate packet
if bytes.Compare(magicToken, packet[:4]) != 0 {
err = NewPeerError(MagicTokenMismatch, " received %v", packet[:4])
break
}
length = int(ethutil.BytesToNumber(packet[4:8]))
packet = packet[8:]
if length > 0 {
start = false // now consuming payload
} else { //penalize peer but read on
self.err <- NewPeerError(EmptyPayload, "")
length = 8
}
} else {
// packet complete (payload fully consumed)
payloads <- packet[:length]
packet = packet[length:] // resclice packet
start = true
length = 8
}
}
// this stops partials read via the connection, should we?
//if err != nil {
// select {
// case errc <- err
// default:
//}
done <- err
}
func (self *Connection) readPartials(partials chan []byte, errc chan *PeerError) {
defer close(partials)
for {
// Give buffering some time
self.conn.SetReadDeadline(time.Now().Add(self.timeout * time.Millisecond))
buffer := make([]byte, readBufferLength)
// read partial from connection
bytesRead, err := self.conn.Read(buffer)
if err == nil || err.Error() == "EOF" {
if bytesRead > 0 {
partials <- buffer[:bytesRead]
}
if err != nil && err.Error() == "EOF" {
break
}
} else {
// unexpected error, report to errc
err := NewPeerError(ReadError, " %v", err)
logger.Debugln(err)
errc <- err
return // will close partials channel
}
}
close(errc)
}

222
p2p/connection_test.go
View File

@ -1,222 +0,0 @@
package p2p
import (
"bytes"
"fmt"
"io"
"net"
"testing"
"time"
)
type TestNetworkConnection struct {
in chan []byte
current []byte
Out [][]byte
addr net.Addr
}
func NewTestNetworkConnection(addr net.Addr) *TestNetworkConnection {
return &TestNetworkConnection{
in: make(chan []byte),
current: []byte{},
Out: [][]byte{},
addr: addr,
}
}
func (self *TestNetworkConnection) In(latency time.Duration, packets ...[]byte) {
time.Sleep(latency)
for _, s := range packets {
self.in <- s
}
}
func (self *TestNetworkConnection) Read(buff []byte) (n int, err error) {
if len(self.current) == 0 {
select {
case self.current = <-self.in:
default:
return 0, io.EOF
}
}
length := len(self.current)
if length > len(buff) {
copy(buff[:], self.current[:len(buff)])
self.current = self.current[len(buff):]
return len(buff), nil
} else {
copy(buff[:length], self.current[:])
self.current = []byte{}
return length, io.EOF
}
}
func (self *TestNetworkConnection) Write(buff []byte) (n int, err error) {
self.Out = append(self.Out, buff)
fmt.Printf("net write %v\n%v\n", len(self.Out), buff)
return len(buff), nil
}
func (self *TestNetworkConnection) Close() (err error) {
return
}
func (self *TestNetworkConnection) LocalAddr() (addr net.Addr) {
return
}
func (self *TestNetworkConnection) RemoteAddr() (addr net.Addr) {
return self.addr
}
func (self *TestNetworkConnection) SetDeadline(t time.Time) (err error) {
return
}
func (self *TestNetworkConnection) SetReadDeadline(t time.Time) (err error) {
return
}
func (self *TestNetworkConnection) SetWriteDeadline(t time.Time) (err error) {
return
}
func setupConnection() (*Connection, *TestNetworkConnection) {
addr := &TestAddr{"test:30303"}
net := NewTestNetworkConnection(addr)
conn := NewConnection(net, NewPeerErrorChannel())
conn.Open()
return conn, net
}
func TestReadingNilPacket(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{})
// time.Sleep(10 * time.Millisecond)
select {
case packet := <-conn.Read():
t.Errorf("read %v", packet)
case err := <-conn.Error():
t.Errorf("incorrect error %v", err)
default:
}
conn.Close()
}
func TestReadingShortPacket(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{0})
select {
case packet := <-conn.Read():
t.Errorf("read %v", packet)
case err := <-conn.Error():
if err.Code != PacketTooShort {
t.Errorf("incorrect error %v, expected %v", err.Code, PacketTooShort)
}
}
conn.Close()
}
func TestReadingInvalidPacket(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{1, 0, 0, 0, 0, 0, 0, 0})
select {
case packet := <-conn.Read():
t.Errorf("read %v", packet)
case err := <-conn.Error():
if err.Code != MagicTokenMismatch {
t.Errorf("incorrect error %v, expected %v", err.Code, MagicTokenMismatch)
}
}
conn.Close()
}
func TestReadingInvalidPayload(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 2, 0})
select {
case packet := <-conn.Read():
t.Errorf("read %v", packet)
case err := <-conn.Error():
if err.Code != PayloadTooShort {
t.Errorf("incorrect error %v, expected %v", err.Code, PayloadTooShort)
}
}
conn.Close()
}
func TestReadingEmptyPayload(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 0})
time.Sleep(10 * time.Millisecond)
select {
case packet := <-conn.Read():
t.Errorf("read %v", packet)
default:
}
select {
case err := <-conn.Error():
code := err.Code
if code != EmptyPayload {
t.Errorf("incorrect error, expected EmptyPayload, got %v", code)
}
default:
t.Errorf("no error, expected EmptyPayload")
}
conn.Close()
}
func TestReadingCompletePacket(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 1, 1})
time.Sleep(10 * time.Millisecond)
select {
case packet := <-conn.Read():
if bytes.Compare(packet, []byte{1}) != 0 {
t.Errorf("incorrect payload read")
}
case err := <-conn.Error():
t.Errorf("incorrect error %v", err)
default:
t.Errorf("nothing read")
}
conn.Close()
}
func TestReadingTwoCompletePackets(t *testing.T) {
conn, net := setupConnection()
go net.In(0, []byte{34, 64, 8, 145, 0, 0, 0, 1, 0, 34, 64, 8, 145, 0, 0, 0, 1, 1})
for i := 0; i < 2; i++ {
time.Sleep(10 * time.Millisecond)
select {
case packet := <-conn.Read():
if bytes.Compare(packet, []byte{byte(i)}) != 0 {
t.Errorf("incorrect payload read")
}
case err := <-conn.Error():
t.Errorf("incorrect error %v", err)
default:
t.Errorf("nothing read")
}
}
conn.Close()
}
func TestWriting(t *testing.T) {
conn, net := setupConnection()
conn.Write() <- []byte{0}
time.Sleep(10 * time.Millisecond)
if len(net.Out) == 0 {
t.Errorf("no output")
} else {
out := net.Out[0]
if bytes.Compare(out, []byte{34, 64, 8, 145, 0, 0, 0, 1, 0}) != 0 {
t.Errorf("incorrect packet %v", out)
}
}
conn.Close()
}
// hello packet with client id ABC: 0x22 40 08 91 00 00 00 08 84 00 00 00 43414243

202
p2p/message.go
View File

@ -1,75 +1,155 @@
package p2p package p2p
import ( import (
// "fmt" "bytes"
"encoding/binary"
"io"
"io/ioutil"
"math/big"
"github.com/ethereum/go-ethereum/ethutil" "github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/rlp"
) )
type MsgCode uint8 // Msg defines the structure of a p2p message.
//
// Note that a Msg can only be sent once since the Payload reader is
// consumed during sending. It is not possible to create a Msg and
// send it any number of times. If you want to reuse an encoded
// structure, encode the payload into a byte array and create a
// separate Msg with a bytes.Reader as Payload for each send.
type Msg struct { type Msg struct {
code MsgCode // this is the raw code as per adaptive msg code scheme Code uint64
data *ethutil.Value Size uint32 // size of the paylod
encoded []byte Payload io.Reader
} }
func (self *Msg) Code() MsgCode { // NewMsg creates an RLP-encoded message with the given code.
return self.code func NewMsg(code uint64, params ...interface{}) Msg {
} buf := new(bytes.Buffer)
for _, p := range params {
func (self *Msg) Data() *ethutil.Value { buf.Write(ethutil.Encode(p))
return self.data
}
func NewMsg(code MsgCode, params ...interface{}) (msg *Msg, err error) {
// // data := [][]interface{}{}
// data := []interface{}{}
// for _, value := range params {
// if encodable, ok := value.(ethutil.RlpEncodeDecode); ok {
// data = append(data, encodable.RlpValue())
// } else if raw, ok := value.([]interface{}); ok {
// data = append(data, raw)
// } else {
// // data = append(data, interface{}(raw))
// err = fmt.Errorf("Unable to encode object of type %T", value)
// return
// }
// }
return &Msg{
code: code,
data: ethutil.NewValue(interface{}(params)),
}, nil
}
func NewMsgFromBytes(encoded []byte) (msg *Msg, err error) {
value := ethutil.NewValueFromBytes(encoded)
// Type of message
code := value.Get(0).Uint()
// Actual data
data := value.SliceFrom(1)
msg = &Msg{
code: MsgCode(code),
data: data,
// data: ethutil.NewValue(data),
encoded: encoded,
} }
return return Msg{Code: code, Size: uint32(buf.Len()), Payload: buf}
} }
func (self *Msg) Decode(offset MsgCode) { func encodePayload(params ...interface{}) []byte {
self.code = self.code - offset buf := new(bytes.Buffer)
} for _, p := range params {
buf.Write(ethutil.Encode(p))
// encode takes an offset argument to implement adaptive message coding
// the encoded message is memoized to make msgs relayed to several peers more efficient
func (self *Msg) Encode(offset MsgCode) (res []byte) {
if len(self.encoded) == 0 {
res = ethutil.NewValue(append([]interface{}{byte(self.code + offset)}, self.data.Slice()...)).Encode()
self.encoded = res
} else {
res = self.encoded
} }
return return buf.Bytes()
}
// Decode parse the RLP content of a message into
// the given value, which must be a pointer.
//
// For the decoding rules, please see package rlp.
func (msg Msg) Decode(val interface{}) error {
s := rlp.NewListStream(msg.Payload, uint64(msg.Size))
return s.Decode(val)
}
// Discard reads any remaining payload data into a black hole.
func (msg Msg) Discard() error {
_, err := io.Copy(ioutil.Discard, msg.Payload)
return err
}
type MsgReader interface {
ReadMsg() (Msg, error)
}
type MsgWriter interface {
// WriteMsg sends an existing message.
// The Payload reader of the message is consumed.
// Note that messages can be sent only once.
WriteMsg(Msg) error
// EncodeMsg writes an RLP-encoded message with the given
// code and data elements.
EncodeMsg(code uint64, data ...interface{}) error
}
// MsgReadWriter provides reading and writing of encoded messages.
type MsgReadWriter interface {
MsgReader
MsgWriter
}
var magicToken = []byte{34, 64, 8, 145}
func writeMsg(w io.Writer, msg Msg) error {
// TODO: handle case when Size + len(code) + len(listhdr) overflows uint32
code := ethutil.Encode(uint32(msg.Code))
listhdr := makeListHeader(msg.Size + uint32(len(code)))
payloadLen := uint32(len(listhdr)) + uint32(len(code)) + msg.Size
start := make([]byte, 8)
copy(start, magicToken)
binary.BigEndian.PutUint32(start[4:], payloadLen)
for _, b := range [][]byte{start, listhdr, code} {
if _, err := w.Write(b); err != nil {
return err
}
}
_, err := io.CopyN(w, msg.Payload, int64(msg.Size))
return err
}
func makeListHeader(length uint32) []byte {
if length < 56 {
return []byte{byte(length + 0xc0)}
}
enc := big.NewInt(int64(length)).Bytes()
lenb := byte(len(enc)) + 0xf7
return append([]byte{lenb}, enc...)
}
// readMsg reads a message header from r.
// It takes an rlp.ByteReader to ensure that the decoding doesn't buffer.
func readMsg(r rlp.ByteReader) (msg Msg, err error) {
// read magic and payload size
start := make([]byte, 8)
if _, err = io.ReadFull(r, start); err != nil {
return msg, newPeerError(errRead, "%v", err)
}
if !bytes.HasPrefix(start, magicToken) {
return msg, newPeerError(errMagicTokenMismatch, "got %x, want %x", start[:4], magicToken)
}
size := binary.BigEndian.Uint32(start[4:])
// decode start of RLP message to get the message code
posr := &postrack{r, 0}
s := rlp.NewStream(posr)
if _, err := s.List(); err != nil {
return msg, err
}
code, err := s.Uint()
if err != nil {
return msg, err
}
payloadsize := size - posr.p
return Msg{code, payloadsize, io.LimitReader(r, int64(payloadsize))}, nil
}
// postrack wraps an rlp.ByteReader with a position counter.
type postrack struct {
r rlp.ByteReader
p uint32
}
func (r *postrack) Read(buf []byte) (int, error) {
n, err := r.r.Read(buf)
r.p += uint32(n)
return n, err
}
func (r *postrack) ReadByte() (byte, error) {
b, err := r.r.ReadByte()
if err == nil {
r.p++
}
return b, err
} }

74
p2p/message_test.go
View File

@ -1,38 +1,70 @@
package p2p package p2p
import ( import (
"bytes"
"io/ioutil"
"testing" "testing"
"github.com/ethereum/go-ethereum/ethutil"
) )
func TestNewMsg(t *testing.T) { func TestNewMsg(t *testing.T) {
msg, _ := NewMsg(3, 1, "000") msg := NewMsg(3, 1, "000")
if msg.Code() != 3 { if msg.Code != 3 {
t.Errorf("incorrect code %v", msg.Code()) t.Errorf("incorrect code %d, want %d", msg.Code)
} }
data0 := msg.Data().Get(0).Uint() if msg.Size != 5 {
data1 := string(msg.Data().Get(1).Bytes()) t.Errorf("incorrect size %d, want %d", msg.Size, 5)
if data0 != 1 {
t.Errorf("incorrect data %v", data0)
} }
if data1 != "000" { pl, _ := ioutil.ReadAll(msg.Payload)
t.Errorf("incorrect data %v", data1) expect := []byte{0x01, 0x83, 0x30, 0x30, 0x30}
if !bytes.Equal(pl, expect) {
t.Errorf("incorrect payload content, got %x, want %x", pl, expect)
} }
} }
func TestEncodeDecodeMsg(t *testing.T) { func TestEncodeDecodeMsg(t *testing.T) {
msg, _ := NewMsg(3, 1, "000") msg := NewMsg(3, 1, "000")
encoded := msg.Encode(3) buf := new(bytes.Buffer)
msg, _ = NewMsgFromBytes(encoded) if err := writeMsg(buf, msg); err != nil {
msg.Decode(3) t.Fatalf("encodeMsg error: %v", err)
if msg.Code() != 3 {
t.Errorf("incorrect code %v", msg.Code())
} }
data0 := msg.Data().Get(0).Uint() // t.Logf("encoded: %x", buf.Bytes())
data1 := msg.Data().Get(1).Str()
if data0 != 1 { decmsg, err := readMsg(buf)
t.Errorf("incorrect data %v", data0) if err != nil {
t.Fatalf("readMsg error: %v", err)
} }
if data1 != "000" { if decmsg.Code != 3 {
t.Errorf("incorrect data %v", data1) t.Errorf("incorrect code %d, want %d", decmsg.Code, 3)
}
if decmsg.Size != 5 {
t.Errorf("incorrect size %d, want %d", decmsg.Size, 5)
}
var data struct {
I int
S string
}
if err := decmsg.Decode(&data); err != nil {
t.Fatalf("Decode error: %v", err)
}
if data.I != 1 {
t.Errorf("incorrect data.I: got %v, expected %d", data.I, 1)
}
if data.S != "000" {
t.Errorf("incorrect data.S: got %q, expected %q", data.S, "000")
}
}
func TestDecodeRealMsg(t *testing.T) {
data := ethutil.Hex2Bytes("2240089100000080f87e8002b5457468657265756d282b2b292f5065657220536572766572204f6e652f76302e372e382f52656c656173652f4c696e75782f672b2bc082765fb84086dd80b7aefd6a6d2e3b93f4f300a86bfb6ef7bdc97cb03f793db6bb")
msg, err := readMsg(bytes.NewReader(data))
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if msg.Code != 0 {
t.Errorf("incorrect code %d, want %d", msg.Code, 0)
} }
} }

220
p2p/messenger.go
View File

@ -1,220 +0,0 @@
package p2p
import (
"fmt"
"sync"
"time"
)
const (
handlerTimeout = 1000
)
type Handlers map[string](func(p *Peer) Protocol)
type Messenger struct {
conn *Connection
peer *Peer
handlers Handlers
protocolLock sync.RWMutex
protocols []Protocol
offsets []MsgCode // offsets for adaptive message idss
protocolTable map[string]int
quit chan chan bool
err chan *PeerError
pulse chan bool
}
func NewMessenger(peer *Peer, conn *Connection, errchan chan *PeerError, handlers Handlers) *Messenger {
baseProtocol := NewBaseProtocol(peer)
return &Messenger{
conn: conn,
peer: peer,
offsets: []MsgCode{baseProtocol.Offset()},
handlers: handlers,
protocols: []Protocol{baseProtocol},
protocolTable: make(map[string]int),
err: errchan,
pulse: make(chan bool, 1),
quit: make(chan chan bool, 1),
}
}
func (self *Messenger) Start() {
self.conn.Open()
go self.messenger()
self.protocolLock.RLock()
defer self.protocolLock.RUnlock()
self.protocols[0].Start()
}
func (self *Messenger) Stop() {
// close pulse to stop ping pong monitoring
close(self.pulse)
self.protocolLock.RLock()
defer self.protocolLock.RUnlock()
for _, protocol := range self.protocols {
protocol.Stop() // could be parallel
}
q := make(chan bool)
self.quit <- q
<-q
self.conn.Close()
}
func (self *Messenger) messenger() {
in := self.conn.Read()
for {
select {
case payload, ok := <-in:
//dispatches message to the protocol asynchronously
if ok {
go self.handle(payload)
} else {
return
}
case q := <-self.quit:
q <- true
return
}
}
}
// handles each message by dispatching to the appropriate protocol
// using adaptive message codes
// this function is started as a separate go routine for each message
// it waits for the protocol response
// then encodes and sends outgoing messages to the connection's write channel
func (self *Messenger) handle(payload []byte) {
// send ping to heartbeat channel signalling time of last message
// select {
// case self.pulse <- true:
// default:
// }
self.pulse <- true
// initialise message from payload
msg, err := NewMsgFromBytes(payload)
if err != nil {
self.err <- NewPeerError(MiscError, " %v", err)
return
}
// retrieves protocol based on message Code
protocol, offset, peerErr := self.getProtocol(msg.Code())
if err != nil {
self.err <- peerErr
return
}
// reset message code based on adaptive offset
msg.Decode(offset)
// dispatches
response := make(chan *Msg)
go protocol.HandleIn(msg, response)
// protocol reponse timeout to prevent leaks
timer := time.After(handlerTimeout * time.Millisecond)
for {
select {
case outgoing, ok := <-response:
// we check if response channel is not closed
if ok {
self.conn.Write() <- outgoing.Encode(offset)
} else {
return
}
case <-timer:
return
}
}
}
// negotiated protocols
// stores offsets needed for adaptive message id scheme
// based on offsets set at handshake
// get the right protocol to handle the message
func (self *Messenger) getProtocol(code MsgCode) (Protocol, MsgCode, *PeerError) {
self.protocolLock.RLock()
defer self.protocolLock.RUnlock()
base := MsgCode(0)
for index, offset := range self.offsets {
if code < offset {
return self.protocols[index], base, nil
}
base = offset
}
return nil, MsgCode(0), NewPeerError(InvalidMsgCode, " %v", code)
}
func (self *Messenger) PingPong(timeout time.Duration, gracePeriod time.Duration, pingCallback func(), timeoutCallback func()) {
fmt.Printf("pingpong keepalive started at %v", time.Now())
timer := time.After(timeout)
pinged := false
for {
select {
case _, ok := <-self.pulse:
if ok {
pinged = false
timer = time.After(timeout)
} else {
// pulse is closed, stop monitoring
return
}
case <-timer:
if pinged {
fmt.Printf("timeout at %v", time.Now())
timeoutCallback()
return
} else {
fmt.Printf("pinged at %v", time.Now())
pingCallback()
timer = time.After(gracePeriod)
pinged = true
}
}
}
}
func (self *Messenger) AddProtocols(protocols []string) {
self.protocolLock.Lock()
defer self.protocolLock.Unlock()
i := len(self.offsets)
offset := self.offsets[i-1]
for _, name := range protocols {
protocolFunc, ok := self.handlers[name]
if ok {
protocol := protocolFunc(self.peer)
self.protocolTable[name] = i
i++
offset += protocol.Offset()
fmt.Println("offset ", name, offset)
self.offsets = append(self.offsets, offset)
self.protocols = append(self.protocols, protocol)
protocol.Start()
} else {
fmt.Println("no ", name)
// protocol not handled
}
}
}
func (self *Messenger) Write(protocol string, msg *Msg) error {
self.protocolLock.RLock()
defer self.protocolLock.RUnlock()
i := 0
offset := MsgCode(0)
if len(protocol) > 0 {
var ok bool
i, ok = self.protocolTable[protocol]
if !ok {
return fmt.Errorf("protocol %v not handled by peer", protocol)
}
offset = self.offsets[i-1]
}
handler := self.protocols[i]
// checking if protocol status/caps allows the message to be sent out
if handler.HandleOut(msg) {
self.conn.Write() <- msg.Encode(offset)
}
return nil
}

147
p2p/messenger_test.go
View File

@ -1,147 +0,0 @@
package p2p
import (
// "fmt"
"bytes"
"testing"
"time"
"github.com/ethereum/go-ethereum/ethutil"
)
func setupMessenger(handlers Handlers) (*TestNetworkConnection, chan *PeerError, *Messenger) {
errchan := NewPeerErrorChannel()
addr := &TestAddr{"test:30303"}
net := NewTestNetworkConnection(addr)
conn := NewConnection(net, errchan)
mess := NewMessenger(nil, conn, errchan, handlers)
mess.Start()
return net, errchan, mess
}
type TestProtocol struct {
Msgs []*Msg
}
func (self *TestProtocol) Start() {
}
func (self *TestProtocol) Stop() {
}
func (self *TestProtocol) Offset() MsgCode {
return MsgCode(5)
}
func (self *TestProtocol) HandleIn(msg *Msg, response chan *Msg) {
self.Msgs = append(self.Msgs, msg)
close(response)
}
func (self *TestProtocol) HandleOut(msg *Msg) bool {
if msg.Code() > 3 {
return false
} else {
return true
}
}
func (self *TestProtocol) Name() string {
return "a"
}
func Packet(offset MsgCode, code MsgCode, params ...interface{}) []byte {
msg, _ := NewMsg(code, params...)
encoded := msg.Encode(offset)
packet := []byte{34, 64, 8, 145}
packet = append(packet, ethutil.NumberToBytes(uint32(len(encoded)), 32)...)
return append(packet, encoded...)
}
func TestRead(t *testing.T) {
handlers := make(Handlers)
testProtocol := &TestProtocol{Msgs: []*Msg{}}
handlers["a"] = func(p *Peer) Protocol { return testProtocol }
net, _, mess := setupMessenger(handlers)
mess.AddProtocols([]string{"a"})
defer mess.Stop()
wait := 1 * time.Millisecond
packet := Packet(16, 1, uint32(1), "000")
go net.In(0, packet)
time.Sleep(wait)
if len(testProtocol.Msgs) != 1 {
t.Errorf("msg not relayed to correct protocol")
} else {
if testProtocol.Msgs[0].Code() != 1 {
t.Errorf("incorrect msg code relayed to protocol")
}
}
}
func TestWrite(t *testing.T) {
handlers := make(Handlers)
testProtocol := &TestProtocol{Msgs: []*Msg{}}
handlers["a"] = func(p *Peer) Protocol { return testProtocol }
net, _, mess := setupMessenger(handlers)
mess.AddProtocols([]string{"a"})
defer mess.Stop()
wait := 1 * time.Millisecond
msg, _ := NewMsg(3, uint32(1), "000")
err := mess.Write("b", msg)
if err == nil {
t.Errorf("expect error for unknown protocol")
}
err = mess.Write("a", msg)
if err != nil {
t.Errorf("expect no error for known protocol: %v", err)
} else {
time.Sleep(wait)
if len(net.Out) != 1 {
t.Errorf("msg not written")
} else {
out := net.Out[0]
packet := Packet(16, 3, uint32(1), "000")
if bytes.Compare(out, packet) != 0 {
t.Errorf("incorrect packet %v", out)
}
}
}
}
func TestPulse(t *testing.T) {
net, _, mess := setupMessenger(make(Handlers))
defer mess.Stop()
ping := false
timeout := false
pingTimeout := 10 * time.Millisecond
gracePeriod := 200 * time.Millisecond
go mess.PingPong(pingTimeout, gracePeriod, func() { ping = true }, func() { timeout = true })
net.In(0, Packet(0, 1))
if ping {
t.Errorf("ping sent too early")
}
time.Sleep(pingTimeout + 100*time.Millisecond)
if !ping {
t.Errorf("no ping sent after timeout")
}
if timeout {
t.Errorf("timeout too early")
}
ping = false
net.In(0, Packet(0, 1))
time.Sleep(pingTimeout + 100*time.Millisecond)
if !ping {
t.Errorf("no ping sent after timeout")
}
if timeout {
t.Errorf("timeout too early")
}
ping = false
time.Sleep(gracePeriod)
if ping {
t.Errorf("ping called twice")
}
if !timeout {
t.Errorf("no timeout after grace period")
}
}

40
p2p/natpmp.go
View File

@ -3,6 +3,7 @@ package p2p
import ( import (
"fmt" "fmt"
"net" "net"
"time"
natpmp "github.com/jackpal/go-nat-pmp" natpmp "github.com/jackpal/go-nat-pmp"
) )
@ -13,38 +14,37 @@ import (
// + Register for changes to the external address. // + Register for changes to the external address.
// + Re-register port mapping when router reboots. // + Re-register port mapping when router reboots.
// + A mechanism for keeping a port mapping registered. // + A mechanism for keeping a port mapping registered.
// + Discover gateway address automatically.
type natPMPClient struct { type natPMPClient struct {
client *natpmp.Client client *natpmp.Client
} }
func NewNatPMP(gateway net.IP) (nat NAT) { // PMP returns a NAT traverser that uses NAT-PMP. The provided gateway
// address should be the IP of your router.
func PMP(gateway net.IP) (nat NAT) {
return &natPMPClient{natpmp.NewClient(gateway)} return &natPMPClient{natpmp.NewClient(gateway)}
} }
func (n *natPMPClient) GetExternalAddress() (addr net.IP, err error) { func (*natPMPClient) String() string {
response, err := n.client.GetExternalAddress() return "NAT-PMP"
if err != nil {
return
}
ip := response.ExternalIPAddress
addr = net.IPv4(ip[0], ip[1], ip[2], ip[3])
return
} }
func (n *natPMPClient) AddPortMapping(protocol string, externalPort, internalPort int, func (n *natPMPClient) GetExternalAddress() (net.IP, error) {
description string, timeout int) (mappedExternalPort int, err error) { response, err := n.client.GetExternalAddress()
if timeout <= 0 { if err != nil {
err = fmt.Errorf("timeout must not be <= 0") return nil, err
return }
return response.ExternalIPAddress[:], nil
}
func (n *natPMPClient) AddPortMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error {
if lifetime <= 0 {
return fmt.Errorf("lifetime must not be <= 0")
} }
// Note order of port arguments is switched between our AddPortMapping and the client's AddPortMapping. // Note order of port arguments is switched between our AddPortMapping and the client's AddPortMapping.
response, err := n.client.AddPortMapping(protocol, internalPort, externalPort, timeout) _, err := n.client.AddPortMapping(protocol, intport, extport, int(lifetime/time.Second))
if err != nil { return err
return
}
mappedExternalPort = int(response.MappedExternalPort)
return
} }
func (n *natPMPClient) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) { func (n *natPMPClient) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {

198
p2p/natupnp.go
View File

@ -7,6 +7,7 @@ import (
"bytes" "bytes"
"encoding/xml" "encoding/xml"
"errors" "errors"
"fmt"
"net" "net"
"net/http" "net/http"
"os" "os"
@ -15,28 +16,46 @@ import (
"time" "time"
) )
const (
upnpDiscoverAttempts = 3
upnpDiscoverTimeout = 5 * time.Second
)
// UPNP returns a NAT port mapper that uses UPnP. It will attempt to
// discover the address of your router using UDP broadcasts.
func UPNP() NAT {
return &upnpNAT{}
}
type upnpNAT struct { type upnpNAT struct {
serviceURL string serviceURL string
ourIP string ourIP string
} }
func upnpDiscover(attempts int) (nat NAT, err error) { func (n *upnpNAT) String() string {
return "UPNP"
}
func (n *upnpNAT) discover() error {
if n.serviceURL != "" {
// already discovered
return nil
}
ssdp, err := net.ResolveUDPAddr("udp4", "239.255.255.250:1900") ssdp, err := net.ResolveUDPAddr("udp4", "239.255.255.250:1900")
if err != nil { if err != nil {
return return err
} }
// TODO: try on all network interfaces simultaneously.
// Broadcasting on 0.0.0.0 could select a random interface
// to send on (platform specific).
conn, err := net.ListenPacket("udp4", ":0") conn, err := net.ListenPacket("udp4", ":0")
if err != nil { if err != nil {
return return err
}
socket := conn.(*net.UDPConn)
defer socket.Close()
err = socket.SetDeadline(time.Now().Add(10 * time.Second))
if err != nil {
return
} }
defer conn.Close()
conn.SetDeadline(time.Now().Add(10 * time.Second))
st := "ST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\n" st := "ST: urn:schemas-upnp-org:device:InternetGatewayDevice:1\r\n"
buf := bytes.NewBufferString( buf := bytes.NewBufferString(
"M-SEARCH * HTTP/1.1\r\n" + "M-SEARCH * HTTP/1.1\r\n" +
@ -46,19 +65,16 @@ func upnpDiscover(attempts int) (nat NAT, err error) {
"MX: 2\r\n\r\n") "MX: 2\r\n\r\n")
message := buf.Bytes() message := buf.Bytes()
answerBytes := make([]byte, 1024) answerBytes := make([]byte, 1024)
for i := 0; i < attempts; i++ { for i := 0; i < upnpDiscoverAttempts; i++ {
_, err = socket.WriteToUDP(message, ssdp) _, err = conn.WriteTo(message, ssdp)
if err != nil { if err != nil {
return return err
} }
var n int nn, _, err := conn.ReadFrom(answerBytes)
n, _, err = socket.ReadFromUDP(answerBytes)
if err != nil { if err != nil {
continue continue
// socket.Close()
// return
} }
answer := string(answerBytes[0:n]) answer := string(answerBytes[0:nn])
if strings.Index(answer, "\r\n"+st) < 0 { if strings.Index(answer, "\r\n"+st) < 0 {
continue continue
} }
@ -79,17 +95,81 @@ func upnpDiscover(attempts int) (nat NAT, err error) {
var serviceURL string var serviceURL string
serviceURL, err = getServiceURL(locURL) serviceURL, err = getServiceURL(locURL)
if err != nil { if err != nil {
return return err
} }
var ourIP string var ourIP string
ourIP, err = getOurIP() ourIP, err = getOurIP()
if err != nil { if err != nil {
return return err
} }
nat = &upnpNAT{serviceURL: serviceURL, ourIP: ourIP} n.serviceURL = serviceURL
n.ourIP = ourIP
return nil
}
return errors.New("UPnP port discovery failed.")
}
func (n *upnpNAT) GetExternalAddress() (addr net.IP, err error) {
if err := n.discover(); err != nil {
return nil, err
}
info, err := n.getStatusInfo()
return net.ParseIP(info.externalIpAddress), err
}
func (n *upnpNAT) AddPortMapping(protocol string, extport, intport int, description string, lifetime time.Duration) error {
if err := n.discover(); err != nil {
return err
}
// A single concatenation would break ARM compilation.
message := "<u:AddPortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(extport)
message += "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>"
message += "<NewInternalPort>" + strconv.Itoa(extport) + "</NewInternalPort>" +
"<NewInternalClient>" + n.ourIP + "</NewInternalClient>" +
"<NewEnabled>1</NewEnabled><NewPortMappingDescription>"
message += description +
"</NewPortMappingDescription><NewLeaseDuration>" + fmt.Sprint(lifetime/time.Second) +
"</NewLeaseDuration></u:AddPortMapping>"
// TODO: check response to see if the port was forwarded
_, err := soapRequest(n.serviceURL, "AddPortMapping", message)
return err
}
func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort int) error {
if err := n.discover(); err != nil {
return err
}
message := "<u:DeletePortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort) +
"</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>" +
"</u:DeletePortMapping>"
// TODO: check response to see if the port was deleted
_, err := soapRequest(n.serviceURL, "DeletePortMapping", message)
return err
}
type statusInfo struct {
externalIpAddress string
}
func (n *upnpNAT) getStatusInfo() (info statusInfo, err error) {
message := "<u:GetStatusInfo xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"</u:GetStatusInfo>"
var response *http.Response
response, err = soapRequest(n.serviceURL, "GetStatusInfo", message)
if err != nil {
return return
} }
err = errors.New("UPnP port discovery failed.")
// TODO: Write a soap reply parser. It has to eat the Body and envelope tags...
response.Body.Close()
return return
} }
@ -259,77 +339,3 @@ func soapRequest(url, function, message string) (r *http.Response, err error) {
} }
return return
} }
type statusInfo struct {
externalIpAddress string
}
func (n *upnpNAT) getStatusInfo() (info statusInfo, err error) {
message := "<u:GetStatusInfo xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"</u:GetStatusInfo>"
var response *http.Response
response, err = soapRequest(n.serviceURL, "GetStatusInfo", message)
if err != nil {
return
}
// TODO: Write a soap reply parser. It has to eat the Body and envelope tags...
response.Body.Close()
return
}
func (n *upnpNAT) GetExternalAddress() (addr net.IP, err error) {
info, err := n.getStatusInfo()
if err != nil {
return
}
addr = net.ParseIP(info.externalIpAddress)
return
}
func (n *upnpNAT) AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error) {
// A single concatenation would break ARM compilation.
message := "<u:AddPortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort)
message += "</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>"
message += "<NewInternalPort>" + strconv.Itoa(internalPort) + "</NewInternalPort>" +
"<NewInternalClient>" + n.ourIP + "</NewInternalClient>" +
"<NewEnabled>1</NewEnabled><NewPortMappingDescription>"
message += description +
"</NewPortMappingDescription><NewLeaseDuration>" + strconv.Itoa(timeout) +
"</NewLeaseDuration></u:AddPortMapping>"
var response *http.Response
response, err = soapRequest(n.serviceURL, "AddPortMapping", message)
if err != nil {
return
}
// TODO: check response to see if the port was forwarded
// log.Println(message, response)
mappedExternalPort = externalPort
_ = response
return
}
func (n *upnpNAT) DeletePortMapping(protocol string, externalPort, internalPort int) (err error) {
message := "<u:DeletePortMapping xmlns:u=\"urn:schemas-upnp-org:service:WANIPConnection:1\">\r\n" +
"<NewRemoteHost></NewRemoteHost><NewExternalPort>" + strconv.Itoa(externalPort) +
"</NewExternalPort><NewProtocol>" + protocol + "</NewProtocol>" +
"</u:DeletePortMapping>"
var response *http.Response
response, err = soapRequest(n.serviceURL, "DeletePortMapping", message)
if err != nil {
return
}
// TODO: check response to see if the port was deleted
// log.Println(message, response)
_ = response
return
}

196
p2p/network.go
View File

@ -1,196 +0,0 @@
package p2p
import (
"fmt"
"math/rand"
"net"
"strconv"
"time"
)
const (
DialerTimeout = 180 //seconds
KeepAlivePeriod = 60 //minutes
portMappingUpdateInterval = 900 // seconds = 15 mins
upnpDiscoverAttempts = 3
)
// Dialer is not an interface in net, so we define one
// *net.Dialer conforms to this
type Dialer interface {
Dial(network, address string) (net.Conn, error)
}
type Network interface {
Start() error
Listener(net.Addr) (net.Listener, error)
Dialer(net.Addr) (Dialer, error)
NewAddr(string, int) (addr net.Addr, err error)
ParseAddr(string) (addr net.Addr, err error)
}
type NAT interface {
GetExternalAddress() (addr net.IP, err error)
AddPortMapping(protocol string, externalPort, internalPort int, description string, timeout int) (mappedExternalPort int, err error)
DeletePortMapping(protocol string, externalPort, internalPort int) (err error)
}
type TCPNetwork struct {
nat NAT
natType NATType
quit chan chan bool
ports chan string
}
type NATType int
const (
NONE = iota
UPNP
PMP
)
const (
portMappingTimeout = 1200 // 20 mins
)
func NewTCPNetwork(natType NATType) (net *TCPNetwork) {
return &TCPNetwork{
natType: natType,
ports: make(chan string),
}
}
func (self *TCPNetwork) Dialer(addr net.Addr) (Dialer, error) {
return &net.Dialer{
Timeout: DialerTimeout * time.Second,
// KeepAlive: KeepAlivePeriod * time.Minute,
LocalAddr: addr,
}, nil
}
func (self *TCPNetwork) Listener(addr net.Addr) (net.Listener, error) {
if self.natType == UPNP {
_, port, _ := net.SplitHostPort(addr.String())
if self.quit == nil {
self.quit = make(chan chan bool)
go self.updatePortMappings()
}
self.ports <- port
}
return net.Listen(addr.Network(), addr.String())
}
func (self *TCPNetwork) Start() (err error) {
switch self.natType {
case NONE:
case UPNP:
nat, uerr := upnpDiscover(upnpDiscoverAttempts)
if uerr != nil {
err = fmt.Errorf("UPNP failed: ", uerr)
} else {
self.nat = nat
}
case PMP:
err = fmt.Errorf("PMP not implemented")
default:
err = fmt.Errorf("Invalid NAT type: %v", self.natType)
}
return
}
func (self *TCPNetwork) Stop() {
q := make(chan bool)
self.quit <- q
<-q
}
func (self *TCPNetwork) addPortMapping(lport int) (err error) {
_, err = self.nat.AddPortMapping("TCP", lport, lport, "p2p listen port", portMappingTimeout)
if err != nil {
logger.Errorf("unable to add port mapping on %v: %v", lport, err)
} else {
logger.Debugf("succesfully added port mapping on %v", lport)
}
return
}
func (self *TCPNetwork) updatePortMappings() {
timer := time.NewTimer(portMappingUpdateInterval * time.Second)
lports := []int{}
out:
for {
select {
case port := <-self.ports:
int64lport, _ := strconv.ParseInt(port, 10, 16)
lport := int(int64lport)
if err := self.addPortMapping(lport); err != nil {
lports = append(lports, lport)
}
case <-timer.C:
for lport := range lports {
if err := self.addPortMapping(lport); err != nil {
}
}
case errc := <-self.quit:
errc <- true
break out
}
}
timer.Stop()
for lport := range lports {
if err := self.nat.DeletePortMapping("TCP", lport, lport); err != nil {
logger.Debugf("unable to remove port mapping on %v: %v", lport, err)
} else {
logger.Debugf("succesfully removed port mapping on %v", lport)
}
}
}
func (self *TCPNetwork) NewAddr(host string, port int) (net.Addr, error) {
ip, err := self.lookupIP(host)
if err == nil {
return &net.TCPAddr{
IP: ip,
Port: port,
}, nil
}
return nil, err
}
func (self *TCPNetwork) ParseAddr(address string) (net.Addr, error) {
host, port, err := net.SplitHostPort(address)
if err == nil {
iport, _ := strconv.Atoi(port)
addr, e := self.NewAddr(host, iport)
return addr, e
}
return nil, err
}
func (*TCPNetwork) lookupIP(host string) (ip net.IP, err error) {
if ip = net.ParseIP(host); ip != nil {
return
}
var ips []net.IP
ips, err = net.LookupIP(host)
if err != nil {
logger.Warnln(err)
return
}
if len(ips) == 0 {
err = fmt.Errorf("No IP addresses available for %v", host)
logger.Warnln(err)
return
}
if len(ips) > 1 {
// Pick a random IP address, simulating round-robin DNS.
rand.Seed(time.Now().UTC().UnixNano())
ip = ips[rand.Intn(len(ips))]
} else {
ip = ips[0]
}
return
}

490
p2p/peer.go
View File

@ -1,83 +1,455 @@
package p2p package p2p
import ( import (
"bufio"
"bytes"
"fmt" "fmt"
"io"
"io/ioutil"
"net" "net"
"strconv" "sort"
"sync"
"time"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/logger"
) )
type Peer struct { // peerAddr is the structure of a peer list element.
// quit chan chan bool // It is also a valid net.Addr.
Inbound bool // inbound (via listener) or outbound (via dialout) type peerAddr struct {
Address net.Addr IP net.IP
Host []byte Port uint64
Port uint16 Pubkey []byte // optional
Pubkey []byte
Id string
Caps []string
peerErrorChan chan *PeerError
messenger *Messenger
peerErrorHandler *PeerErrorHandler
server *Server
} }
func (self *Peer) Messenger() *Messenger { func newPeerAddr(addr net.Addr, pubkey []byte) *peerAddr {
return self.messenger n := addr.Network()
} if n != "tcp" && n != "tcp4" && n != "tcp6" {
// for testing with non-TCP
func (self *Peer) PeerErrorChan() chan *PeerError { return &peerAddr{net.ParseIP("127.0.0.1"), 30303, pubkey}
return self.peerErrorChan
}
func (self *Peer) Server() *Server {
return self.server
}
func NewPeer(conn net.Conn, address net.Addr, inbound bool, server *Server) *Peer {
peerErrorChan := NewPeerErrorChannel()
host, port, _ := net.SplitHostPort(address.String())
intport, _ := strconv.Atoi(port)
peer := &Peer{
Inbound: inbound,
Address: address,
Port: uint16(intport),
Host: net.ParseIP(host),
peerErrorChan: peerErrorChan,
server: server,
} }
connection := NewConnection(conn, peerErrorChan) ta := addr.(*net.TCPAddr)
peer.messenger = NewMessenger(peer, connection, peerErrorChan, server.Handlers()) return &peerAddr{ta.IP, uint64(ta.Port), pubkey}
peer.peerErrorHandler = NewPeerErrorHandler(address, server.PeerDisconnect(), peerErrorChan, server.Blacklist()) }
func (d peerAddr) Network() string {
if d.IP.To4() != nil {
return "tcp4"
} else {
return "tcp6"
}
}
func (d peerAddr) String() string {
return fmt.Sprintf("%v:%d", d.IP, d.Port)
}
func (d peerAddr) RlpData() interface{} {
return []interface{}{d.IP, d.Port, d.Pubkey}
}
// Peer represents a remote peer.
type Peer struct {
// Peers have all the log methods.
// Use them to display messages related to the peer.
*logger.Logger
infolock sync.Mutex
identity ClientIdentity
caps []Cap
listenAddr *peerAddr // what remote peer is listening on
dialAddr *peerAddr // non-nil if dialing
// The mutex protects the connection
// so only one protocol can write at a time.
writeMu sync.Mutex
conn net.Conn
bufconn *bufio.ReadWriter
// These fields maintain the running protocols.
protocols []Protocol
runBaseProtocol bool // for testing
runlock sync.RWMutex // protects running
running map[string]*proto
protoWG sync.WaitGroup
protoErr chan error
closed chan struct{}
disc chan DiscReason
activity event.TypeMux // for activity events
slot int // index into Server peer list
// These fields are kept so base protocol can access them.
// TODO: this should be one or more interfaces
ourID ClientIdentity // client id of the Server
ourListenAddr *peerAddr // listen addr of Server, nil if not listening
newPeerAddr chan<- *peerAddr // tell server about received peers
otherPeers func() []*Peer // should return the list of all peers
pubkeyHook func(*peerAddr) error // called at end of handshake to validate pubkey
}
// NewPeer returns a peer for testing purposes.
func NewPeer(id ClientIdentity, caps []Cap) *Peer {
conn, _ := net.Pipe()
peer := newPeer(conn, nil, nil)
peer.setHandshakeInfo(id, nil, caps)
close(peer.closed)
return peer return peer
} }
func (self *Peer) String() string { func newServerPeer(server *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
var kind string p := newPeer(conn, server.Protocols, dialAddr)
if self.Inbound { p.ourID = server.Identity
kind = "inbound" p.newPeerAddr = server.peerConnect
} else { p.otherPeers = server.Peers
p.pubkeyHook = server.verifyPeer
p.runBaseProtocol = true
// laddr can be updated concurrently by NAT traversal.
// newServerPeer must be called with the server lock held.
if server.laddr != nil {
p.ourListenAddr = newPeerAddr(server.laddr, server.Identity.Pubkey())
}
return p
}
func newPeer(conn net.Conn, protocols []Protocol, dialAddr *peerAddr) *Peer {
p := &Peer{
Logger: logger.NewLogger("P2P " + conn.RemoteAddr().String()),
conn: conn,
dialAddr: dialAddr,
bufconn: bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn)),
protocols: protocols,
running: make(map[string]*proto),
disc: make(chan DiscReason),
protoErr: make(chan error),
closed: make(chan struct{}),
}
return p
}
// Identity returns the client identity of the remote peer. The
// identity can be nil if the peer has not yet completed the
// handshake.
func (p *Peer) Identity() ClientIdentity {
p.infolock.Lock()
defer p.infolock.Unlock()
return p.identity
}
// Caps returns the capabilities (supported subprotocols) of the remote peer.
func (p *Peer) Caps() []Cap {
p.infolock.Lock()
defer p.infolock.Unlock()
return p.caps
}
func (p *Peer) setHandshakeInfo(id ClientIdentity, laddr *peerAddr, caps []Cap) {
p.infolock.Lock()
p.identity = id
p.listenAddr = laddr
p.caps = caps
p.infolock.Unlock()
}
// RemoteAddr returns the remote address of the network connection.
func (p *Peer) RemoteAddr() net.Addr {
return p.conn.RemoteAddr()
}
// LocalAddr returns the local address of the network connection.
func (p *Peer) LocalAddr() net.Addr {
return p.conn.LocalAddr()
}
// Disconnect terminates the peer connection with the given reason.
// It returns immediately and does not wait until the connection is closed.
func (p *Peer) Disconnect(reason DiscReason) {
select {
case p.disc <- reason:
case <-p.closed:
}
}
// String implements fmt.Stringer.
func (p *Peer) String() string {
kind := "inbound"
p.infolock.Lock()
if p.dialAddr != nil {
kind = "outbound" kind = "outbound"
} }
return fmt.Sprintf("%v:%v (%s) v%v %v", self.Host, self.Port, kind, self.Id, self.Caps) p.infolock.Unlock()
return fmt.Sprintf("Peer(%p %v %s)", p, p.conn.RemoteAddr(), kind)
} }
func (self *Peer) Write(protocol string, msg *Msg) error { const (
return self.messenger.Write(protocol, msg) // maximum amount of time allowed for reading a message
msgReadTimeout = 5 * time.Second
// maximum amount of time allowed for writing a message
msgWriteTimeout = 5 * time.Second
// messages smaller than this many bytes will be read at
// once before passing them to a protocol.
wholePayloadSize = 64 * 1024
)
var (
inactivityTimeout = 2 * time.Second
disconnectGracePeriod = 2 * time.Second
)
func (p *Peer) loop() (reason DiscReason, err error) {
defer p.activity.Stop()
defer p.closeProtocols()
defer close(p.closed)
defer p.conn.Close()
// read loop
readMsg := make(chan Msg)
readErr := make(chan error)
readNext := make(chan bool, 1)
protoDone := make(chan struct{}, 1)
go p.readLoop(readMsg, readErr, readNext)
readNext <- true
if p.runBaseProtocol {
p.startBaseProtocol()
}
loop:
for {
select {
case msg := <-readMsg:
// a new message has arrived.
var wait bool
if wait, err = p.dispatch(msg, protoDone); err != nil {
p.Errorf("msg dispatch error: %v\n", err)
reason = discReasonForError(err)
break loop
}
if !wait {
// Msg has already been read completely, continue with next message.
readNext <- true
}
p.activity.Post(time.Now())
case <-protoDone:
// protocol has consumed the message payload,
// we can continue reading from the socket.
readNext <- true
case err := <-readErr:
// read failed. there is no need to run the
// polite disconnect sequence because the connection
// is probably dead anyway.
// TODO: handle write errors as well
return DiscNetworkError, err
case err = <-p.protoErr:
reason = discReasonForError(err)
break loop
case reason = <-p.disc:
break loop
}
}
// wait for read loop to return.
close(readNext)
<-readErr
// tell the remote end to disconnect
done := make(chan struct{})
go func() {
p.conn.SetDeadline(time.Now().Add(disconnectGracePeriod))
p.writeMsg(NewMsg(discMsg, reason), disconnectGracePeriod)
io.Copy(ioutil.Discard, p.conn)
close(done)
}()
select {
case <-done:
case <-time.After(disconnectGracePeriod):
}
return reason, err
} }
func (self *Peer) Start() { func (p *Peer) readLoop(msgc chan<- Msg, errc chan<- error, unblock <-chan bool) {
self.peerErrorHandler.Start() for _ = range unblock {
self.messenger.Start() p.conn.SetReadDeadline(time.Now().Add(msgReadTimeout))
if msg, err := readMsg(p.bufconn); err != nil {
errc <- err
} else {
msgc <- msg
}
}
close(errc)
} }
func (self *Peer) Stop() { func (p *Peer) dispatch(msg Msg, protoDone chan struct{}) (wait bool, err error) {
self.peerErrorHandler.Stop() proto, err := p.getProto(msg.Code)
self.messenger.Stop() if err != nil {
// q := make(chan bool) return false, err
// self.quit <- q }
// <-q if msg.Size <= wholePayloadSize {
// optimization: msg is small enough, read all
// of it and move on to the next message
buf, err := ioutil.ReadAll(msg.Payload)
if err != nil {
return false, err
}
msg.Payload = bytes.NewReader(buf)
proto.in <- msg
} else {
wait = true
pr := &eofSignal{msg.Payload, protoDone}
msg.Payload = pr
proto.in <- msg
}
return wait, nil
} }
func (p *Peer) Encode() []interface{} { func (p *Peer) startBaseProtocol() {
return []interface{}{p.Host, p.Port, p.Pubkey} p.runlock.Lock()
defer p.runlock.Unlock()
p.running[""] = p.startProto(0, Protocol{
Length: baseProtocolLength,
Run: runBaseProtocol,
})
}
// startProtocols starts matching named subprotocols.
func (p *Peer) startSubprotocols(caps []Cap) {
sort.Sort(capsByName(caps))
p.runlock.Lock()
defer p.runlock.Unlock()
offset := baseProtocolLength
outer:
for _, cap := range caps {
for _, proto := range p.protocols {
if proto.Name == cap.Name &&
proto.Version == cap.Version &&
p.running[cap.Name] == nil {
p.running[cap.Name] = p.startProto(offset, proto)
offset += proto.Length
continue outer
}
}
}
}
func (p *Peer) startProto(offset uint64, impl Protocol) *proto {
rw := &proto{
in: make(chan Msg),
offset: offset,
maxcode: impl.Length,
peer: p,
}
p.protoWG.Add(1)
go func() {
err := impl.Run(p, rw)
if err == nil {
p.Infof("protocol %q returned", impl.Name)
err = newPeerError(errMisc, "protocol returned")
} else {
p.Errorf("protocol %q error: %v\n", impl.Name, err)
}
select {
case p.protoErr <- err:
case <-p.closed:
}
p.protoWG.Done()
}()
return rw
}
// getProto finds the protocol responsible for handling
// the given message code.
func (p *Peer) getProto(code uint64) (*proto, error) {
p.runlock.RLock()
defer p.runlock.RUnlock()
for _, proto := range p.running {
if code >= proto.offset && code < proto.offset+proto.maxcode {
return proto, nil
}
}
return nil, newPeerError(errInvalidMsgCode, "%d", code)
}
func (p *Peer) closeProtocols() {
p.runlock.RLock()
for _, p := range p.running {
close(p.in)
}
p.runlock.RUnlock()
p.protoWG.Wait()
}
// writeProtoMsg sends the given message on behalf of the given named protocol.
func (p *Peer) writeProtoMsg(protoName string, msg Msg) error {
p.runlock.RLock()
proto, ok := p.running[protoName]
p.runlock.RUnlock()
if !ok {
return fmt.Errorf("protocol %s not handled by peer", protoName)
}
if msg.Code >= proto.maxcode {
return newPeerError(errInvalidMsgCode, "code %x is out of range for protocol %q", msg.Code, protoName)
}
msg.Code += proto.offset
return p.writeMsg(msg, msgWriteTimeout)
}
// writeMsg writes a message to the connection.
func (p *Peer) writeMsg(msg Msg, timeout time.Duration) error {
p.writeMu.Lock()
defer p.writeMu.Unlock()
p.conn.SetWriteDeadline(time.Now().Add(timeout))
if err := writeMsg(p.bufconn, msg); err != nil {
return newPeerError(errWrite, "%v", err)
}
return p.bufconn.Flush()
}
type proto struct {
name string
in chan Msg
maxcode, offset uint64
peer *Peer
}
func (rw *proto) WriteMsg(msg Msg) error {
if msg.Code >= rw.maxcode {
return newPeerError(errInvalidMsgCode, "not handled")
}
msg.Code += rw.offset
return rw.peer.writeMsg(msg, msgWriteTimeout)
}
func (rw *proto) EncodeMsg(code uint64, data ...interface{}) error {
return rw.WriteMsg(NewMsg(code, data))
}
func (rw *proto) ReadMsg() (Msg, error) {
msg, ok := <-rw.in
if !ok {
return msg, io.EOF
}
msg.Code -= rw.offset
return msg, nil
}
// eofSignal wraps a reader with eof signaling.
// the eof channel is closed when the wrapped reader
// reaches EOF.
type eofSignal struct {
wrapped io.Reader
eof chan<- struct{}
}
func (r *eofSignal) Read(buf []byte) (int, error) {
n, err := r.wrapped.Read(buf)
if err != nil {
r.eof <- struct{}{} // tell Peer that msg has been consumed
}
return n, err
} }

152
p2p/peer_error.go
View File

@ -4,73 +4,121 @@ import (
"fmt" "fmt"
) )
type ErrorCode int
const errorChanCapacity = 10
const ( const (
PacketTooShort = iota errMagicTokenMismatch = iota
PayloadTooShort errRead
MagicTokenMismatch errWrite
EmptyPayload errMisc
ReadError errInvalidMsgCode
WriteError errInvalidMsg
MiscError errP2PVersionMismatch
InvalidMsgCode errPubkeyMissing
InvalidMsg errPubkeyInvalid
P2PVersionMismatch errPubkeyForbidden
PubkeyMissing errProtocolBreach
PubkeyInvalid errPingTimeout
PubkeyForbidden errInvalidNetworkId
ProtocolBreach errInvalidProtocolVersion
PortMismatch
PingTimeout
InvalidGenesis
InvalidNetworkId
InvalidProtocolVersion
) )
var errorToString = map[ErrorCode]string{ var errorToString = map[int]string{
PacketTooShort: "Packet too short", errMagicTokenMismatch: "Magic token mismatch",
PayloadTooShort: "Payload too short", errRead: "Read error",
MagicTokenMismatch: "Magic token mismatch", errWrite: "Write error",
EmptyPayload: "Empty payload", errMisc: "Misc error",
ReadError: "Read error", errInvalidMsgCode: "Invalid message code",
WriteError: "Write error", errInvalidMsg: "Invalid message",
MiscError: "Misc error", errP2PVersionMismatch: "P2P Version Mismatch",
InvalidMsgCode: "Invalid message code", errPubkeyMissing: "Public key missing",
InvalidMsg: "Invalid message", errPubkeyInvalid: "Public key invalid",
P2PVersionMismatch: "P2P Version Mismatch", errPubkeyForbidden: "Public key forbidden",
PubkeyMissing: "Public key missing", errProtocolBreach: "Protocol Breach",
PubkeyInvalid: "Public key invalid", errPingTimeout: "Ping timeout",
PubkeyForbidden: "Public key forbidden", errInvalidNetworkId: "Invalid network id",
ProtocolBreach: "Protocol Breach", errInvalidProtocolVersion: "Invalid protocol version",
PortMismatch: "Port mismatch",
PingTimeout: "Ping timeout",
InvalidGenesis: "Invalid genesis block",
InvalidNetworkId: "Invalid network id",
InvalidProtocolVersion: "Invalid protocol version",
} }
type PeerError struct { type peerError struct {
Code ErrorCode Code int
message string message string
} }
func NewPeerError(code ErrorCode, format string, v ...interface{}) *PeerError { func newPeerError(code int, format string, v ...interface{}) *peerError {
desc, ok := errorToString[code] desc, ok := errorToString[code]
if !ok { if !ok {
panic("invalid error code") panic("invalid error code")
} }
format = desc + ": " + format err := &peerError{code, desc}
message := fmt.Sprintf(format, v...) if format != "" {
return &PeerError{code, message} err.message += ": " + fmt.Sprintf(format, v...)
}
return err
} }
func (self *PeerError) Error() string { func (self *peerError) Error() string {
return self.message return self.message
} }
func NewPeerErrorChannel() chan *PeerError { type DiscReason byte
return make(chan *PeerError, errorChanCapacity)
const (
DiscRequested DiscReason = 0x00
DiscNetworkError = 0x01
DiscProtocolError = 0x02
DiscUselessPeer = 0x03
DiscTooManyPeers = 0x04
DiscAlreadyConnected = 0x05
DiscIncompatibleVersion = 0x06
DiscInvalidIdentity = 0x07
DiscQuitting = 0x08
DiscUnexpectedIdentity = 0x09
DiscSelf = 0x0a
DiscReadTimeout = 0x0b
DiscSubprotocolError = 0x10
)
var discReasonToString = [DiscSubprotocolError + 1]string{
DiscRequested: "Disconnect requested",
DiscNetworkError: "Network error",
DiscProtocolError: "Breach of protocol",
DiscUselessPeer: "Useless peer",
DiscTooManyPeers: "Too many peers",
DiscAlreadyConnected: "Already connected",
DiscIncompatibleVersion: "Incompatible P2P protocol version",
DiscInvalidIdentity: "Invalid node identity",
DiscQuitting: "Client quitting",
DiscUnexpectedIdentity: "Unexpected identity",
DiscSelf: "Connected to self",
DiscReadTimeout: "Read timeout",
DiscSubprotocolError: "Subprotocol error",
}
func (d DiscReason) String() string {
if len(discReasonToString) < int(d) {
return fmt.Sprintf("Unknown Reason(%d)", d)
}
return discReasonToString[d]
}
func discReasonForError(err error) DiscReason {
peerError, ok := err.(*peerError)
if !ok {
return DiscSubprotocolError
}
switch peerError.Code {
case errP2PVersionMismatch:
return DiscIncompatibleVersion
case errPubkeyMissing, errPubkeyInvalid:
return DiscInvalidIdentity
case errPubkeyForbidden:
return DiscUselessPeer
case errInvalidMsgCode, errMagicTokenMismatch, errProtocolBreach:
return DiscProtocolError
case errPingTimeout:
return DiscReadTimeout
case errRead, errWrite, errMisc:
return DiscNetworkError
default:
return DiscSubprotocolError
}
} }

101
p2p/peer_error_handler.go
View File

@ -1,101 +0,0 @@
package p2p
import (
"net"
)
const (
severityThreshold = 10
)
type DisconnectRequest struct {
addr net.Addr
reason DiscReason
}
type PeerErrorHandler struct {
quit chan chan bool
address net.Addr
peerDisconnect chan DisconnectRequest
severity int
peerErrorChan chan *PeerError
blacklist Blacklist
}
func NewPeerErrorHandler(address net.Addr, peerDisconnect chan DisconnectRequest, peerErrorChan chan *PeerError, blacklist Blacklist) *PeerErrorHandler {
return &PeerErrorHandler{
quit: make(chan chan bool),
address: address,
peerDisconnect: peerDisconnect,
peerErrorChan: peerErrorChan,
blacklist: blacklist,
}
}
func (self *PeerErrorHandler) Start() {
go self.listen()
}
func (self *PeerErrorHandler) Stop() {
q := make(chan bool)
self.quit <- q
<-q
}
func (self *PeerErrorHandler) listen() {
for {
select {
case peerError, ok := <-self.peerErrorChan:
if ok {
logger.Debugf("error %v\n", peerError)
go self.handle(peerError)
} else {
return
}
case q := <-self.quit:
q <- true
return
}
}
}
func (self *PeerErrorHandler) handle(peerError *PeerError) {
reason := DiscReason(' ')
switch peerError.Code {
case P2PVersionMismatch:
reason = DiscIncompatibleVersion
case PubkeyMissing, PubkeyInvalid:
reason = DiscInvalidIdentity
case PubkeyForbidden:
reason = DiscUselessPeer
case InvalidMsgCode, PacketTooShort, PayloadTooShort, MagicTokenMismatch, EmptyPayload, ProtocolBreach:
reason = DiscProtocolError
case PingTimeout:
reason = DiscReadTimeout
case WriteError, MiscError:
reason = DiscNetworkError
case InvalidGenesis, InvalidNetworkId, InvalidProtocolVersion:
reason = DiscSubprotocolError
default:
self.severity += self.getSeverity(peerError)
}
if self.severity >= severityThreshold {
reason = DiscSubprotocolError
}
if reason != DiscReason(' ') {
self.peerDisconnect <- DisconnectRequest{
addr: self.address,
reason: reason,
}
}
}
func (self *PeerErrorHandler) getSeverity(peerError *PeerError) int {
switch peerError.Code {
case ReadError:
return 4 //tolerate 3 :)
default:
return 1
}
}

34
p2p/peer_error_handler_test.go
View File

@ -1,34 +0,0 @@
package p2p
import (
// "fmt"
"net"
"testing"
"time"
)
func TestPeerErrorHandler(t *testing.T) {
address := &net.TCPAddr{IP: net.IP([]byte{1, 2, 3, 4}), Port: 30303}
peerDisconnect := make(chan DisconnectRequest)
peerErrorChan := NewPeerErrorChannel()
peh := NewPeerErrorHandler(address, peerDisconnect, peerErrorChan, NewBlacklist())
peh.Start()
defer peh.Stop()
for i := 0; i < 11; i++ {
select {
case <-peerDisconnect:
t.Errorf("expected no disconnect request")
default:
}
peerErrorChan <- NewPeerError(MiscError, "")
}
time.Sleep(1 * time.Millisecond)
select {
case request := <-peerDisconnect:
if request.addr.String() != address.String() {
t.Errorf("incorrect address %v != %v", request.addr, address)
}
default:
t.Errorf("expected disconnect request")
}
}

303
p2p/peer_test.go
View File

@ -1,96 +1,239 @@
package p2p package p2p
import ( import (
"bufio"
"bytes" "bytes"
"fmt" "encoding/hex"
// "net" "io/ioutil"
"net"
"reflect"
"testing" "testing"
"time" "time"
) )
func TestPeer(t *testing.T) { var discard = Protocol{
handlers := make(Handlers) Name: "discard",
testProtocol := &TestProtocol{Msgs: []*Msg{}} Length: 1,
handlers["aaa"] = func(p *Peer) Protocol { return testProtocol } Run: func(p *Peer, rw MsgReadWriter) error {
handlers["ccc"] = func(p *Peer) Protocol { return testProtocol } for {
addr := &TestAddr{"test:30"} msg, err := rw.ReadMsg()
conn := NewTestNetworkConnection(addr) if err != nil {
_, server := SetupTestServer(handlers) return err
server.Handshake() }
peer := NewPeer(conn, addr, true, server) if err = msg.Discard(); err != nil {
// peer.Messenger().AddProtocols([]string{"aaa", "ccc"}) return err
peer.Start()
defer peer.Stop()
time.Sleep(2 * time.Millisecond)
if len(conn.Out) != 1 {
t.Errorf("handshake not sent")
} else {
out := conn.Out[0]
packet := Packet(0, HandshakeMsg, P2PVersion, []byte(peer.server.identity.String()), []interface{}{peer.server.protocols}, peer.server.port, peer.server.identity.Pubkey()[1:])
if bytes.Compare(out, packet) != 0 {
t.Errorf("incorrect handshake packet %v != %v", out, packet)
}
}
packet := Packet(0, HandshakeMsg, P2PVersion, []byte("peer"), []interface{}{"bbb", "aaa", "ccc"}, 30, []byte("0000000000000000000000000000000000000000000000000000000000000000"))
conn.In(0, packet)
time.Sleep(10 * time.Millisecond)
pro, _ := peer.Messenger().protocols[0].(*BaseProtocol)
if pro.state != handshakeReceived {
t.Errorf("handshake not received")
}
if peer.Port != 30 {
t.Errorf("port incorrectly set")
}
if peer.Id != "peer" {
t.Errorf("id incorrectly set")
}
if string(peer.Pubkey) != "0000000000000000000000000000000000000000000000000000000000000000" {
t.Errorf("pubkey incorrectly set")
}
fmt.Println(peer.Caps)
if len(peer.Caps) != 3 || peer.Caps[0] != "aaa" || peer.Caps[1] != "bbb" || peer.Caps[2] != "ccc" {
t.Errorf("protocols incorrectly set")
}
msg, _ := NewMsg(3)
err := peer.Write("aaa", msg)
if err != nil {
t.Errorf("expect no error for known protocol: %v", err)
} else {
time.Sleep(1 * time.Millisecond)
if len(conn.Out) != 2 {
t.Errorf("msg not written")
} else {
out := conn.Out[1]
packet := Packet(16, 3)
if bytes.Compare(out, packet) != 0 {
t.Errorf("incorrect packet %v != %v", out, packet)
} }
} }
} },
}
msg, _ = NewMsg(2) func testPeer(protos []Protocol) (net.Conn, *Peer, <-chan error) {
err = peer.Write("ccc", msg) conn1, conn2 := net.Pipe()
if err != nil { id := NewSimpleClientIdentity("test", "0", "0", "public key")
t.Errorf("expect no error for known protocol: %v", err) peer := newPeer(conn1, protos, nil)
} else { peer.ourID = id
time.Sleep(1 * time.Millisecond) peer.pubkeyHook = func(*peerAddr) error { return nil }
if len(conn.Out) != 3 { errc := make(chan error, 1)
t.Errorf("msg not written") go func() {
} else { _, err := peer.loop()
out := conn.Out[2] errc <- err
packet := Packet(21, 2) }()
if bytes.Compare(out, packet) != 0 { return conn2, peer, errc
t.Errorf("incorrect packet %v != %v", out, packet) }
func TestPeerProtoReadMsg(t *testing.T) {
defer testlog(t).detach()
done := make(chan struct{})
proto := Protocol{
Name: "a",
Length: 5,
Run: func(peer *Peer, rw MsgReadWriter) error {
msg, err := rw.ReadMsg()
if err != nil {
t.Errorf("read error: %v", err)
} }
} if msg.Code != 2 {
t.Errorf("incorrect msg code %d relayed to protocol", msg.Code)
}
data, err := ioutil.ReadAll(msg.Payload)
if err != nil {
t.Errorf("payload read error: %v", err)
}
expdata, _ := hex.DecodeString("0183303030")
if !bytes.Equal(expdata, data) {
t.Errorf("incorrect msg data %x", data)
}
close(done)
return nil
},
} }
err = peer.Write("bbb", msg) net, peer, errc := testPeer([]Protocol{proto})
time.Sleep(1 * time.Millisecond) defer net.Close()
if err == nil { peer.startSubprotocols([]Cap{proto.cap()})
t.Errorf("expect error for unknown protocol")
writeMsg(net, NewMsg(18, 1, "000"))
select {
case <-done:
case err := <-errc:
t.Errorf("peer returned: %v", err)
case <-time.After(2 * time.Second):
t.Errorf("receive timeout")
} }
} }
func TestPeerProtoReadLargeMsg(t *testing.T) {
defer testlog(t).detach()
msgsize := uint32(10 * 1024 * 1024)
done := make(chan struct{})
proto := Protocol{
Name: "a",
Length: 5,
Run: func(peer *Peer, rw MsgReadWriter) error {
msg, err := rw.ReadMsg()
if err != nil {
t.Errorf("read error: %v", err)
}
if msg.Size != msgsize+4 {
t.Errorf("incorrect msg.Size, got %d, expected %d", msg.Size, msgsize)
}
msg.Discard()
close(done)
return nil
},
}
net, peer, errc := testPeer([]Protocol{proto})
defer net.Close()
peer.startSubprotocols([]Cap{proto.cap()})
writeMsg(net, NewMsg(18, make([]byte, msgsize)))
select {
case <-done:
case err := <-errc:
t.Errorf("peer returned: %v", err)
case <-time.After(2 * time.Second):
t.Errorf("receive timeout")
}
}
func TestPeerProtoEncodeMsg(t *testing.T) {
defer testlog(t).detach()
proto := Protocol{
Name: "a",
Length: 2,
Run: func(peer *Peer, rw MsgReadWriter) error {
if err := rw.EncodeMsg(2); err == nil {
t.Error("expected error for out-of-range msg code, got nil")
}
if err := rw.EncodeMsg(1); err != nil {
t.Errorf("write error: %v", err)
}
return nil
},
}
net, peer, _ := testPeer([]Protocol{proto})
defer net.Close()
peer.startSubprotocols([]Cap{proto.cap()})
bufr := bufio.NewReader(net)
msg, err := readMsg(bufr)
if err != nil {
t.Errorf("read error: %v", err)
}
if msg.Code != 17 {
t.Errorf("incorrect message code: got %d, expected %d", msg.Code, 17)
}
}
func TestPeerWrite(t *testing.T) {
defer testlog(t).detach()
net, peer, peerErr := testPeer([]Protocol{discard})
defer net.Close()
peer.startSubprotocols([]Cap{discard.cap()})
// test write errors
if err := peer.writeProtoMsg("b", NewMsg(3)); err == nil {
t.Errorf("expected error for unknown protocol, got nil")
}
if err := peer.writeProtoMsg("discard", NewMsg(8)); err == nil {
t.Errorf("expected error for out-of-range msg code, got nil")
} else if perr, ok := err.(*peerError); !ok || perr.Code != errInvalidMsgCode {
t.Errorf("wrong error for out-of-range msg code, got %#v", err)
}
// setup for reading the message on the other end
read := make(chan struct{})
go func() {
bufr := bufio.NewReader(net)
msg, err := readMsg(bufr)
if err != nil {
t.Errorf("read error: %v", err)
} else if msg.Code != 16 {
t.Errorf("wrong code, got %d, expected %d", msg.Code, 16)
}
msg.Discard()
close(read)
}()
// test succcessful write
if err := peer.writeProtoMsg("discard", NewMsg(0)); err != nil {
t.Errorf("expect no error for known protocol: %v", err)
}
select {
case <-read:
case err := <-peerErr:
t.Fatalf("peer stopped: %v", err)
}
}
func TestPeerActivity(t *testing.T) {
// shorten inactivityTimeout while this test is running
oldT := inactivityTimeout
defer func() { inactivityTimeout = oldT }()
inactivityTimeout = 20 * time.Millisecond
net, peer, peerErr := testPeer([]Protocol{discard})
defer net.Close()
peer.startSubprotocols([]Cap{discard.cap()})
sub := peer.activity.Subscribe(time.Time{})
defer sub.Unsubscribe()
for i := 0; i < 6; i++ {
writeMsg(net, NewMsg(16))
select {
case <-sub.Chan():
case <-time.After(inactivityTimeout / 2):
t.Fatal("no event within ", inactivityTimeout/2)
case err := <-peerErr:
t.Fatal("peer error", err)
}
}
select {
case <-time.After(inactivityTimeout * 2):
case <-sub.Chan():
t.Fatal("got activity event while connection was inactive")
case err := <-peerErr:
t.Fatal("peer error", err)
}
}
func TestNewPeer(t *testing.T) {
id := NewSimpleClientIdentity("clientid", "version", "customid", "pubkey")
caps := []Cap{{"foo", 2}, {"bar", 3}}
p := NewPeer(id, caps)
if !reflect.DeepEqual(p.Caps(), caps) {
t.Errorf("Caps mismatch: got %v, expected %v", p.Caps(), caps)
}
if p.Identity() != id {
t.Errorf("Identity mismatch: got %v, expected %v", p.Identity(), id)
}
// Should not hang.
p.Disconnect(DiscAlreadyConnected)
}

501
p2p/protocol.go
View File

@ -2,277 +2,294 @@ package p2p
import ( import (
"bytes" "bytes"
"fmt"
"net"
"sort"
"sync"
"time" "time"
"github.com/ethereum/go-ethereum/ethutil"
) )
type Protocol interface { // Protocol represents a P2P subprotocol implementation.
Start() type Protocol struct {
Stop() // Name should contain the official protocol name,
HandleIn(*Msg, chan *Msg) // often a three-letter word.
HandleOut(*Msg) bool Name string
Offset() MsgCode
Name() string // Version should contain the version number of the protocol.
Version uint
// Length should contain the number of message codes used
// by the protocol.
Length uint64
// Run is called in a new groutine when the protocol has been
// negotiated with a peer. It should read and write messages from
// rw. The Payload for each message must be fully consumed.
//
// The peer connection is closed when Start returns. It should return
// any protocol-level error (such as an I/O error) that is
// encountered.
Run func(peer *Peer, rw MsgReadWriter) error
}
func (p Protocol) cap() Cap {
return Cap{p.Name, p.Version}
} }
const ( const (
P2PVersion = 0 baseProtocolVersion = 2
pingTimeout = 2 baseProtocolLength = uint64(16)
pingGracePeriod = 2 baseProtocolMaxMsgSize = 10 * 1024 * 1024
) )
const ( const (
HandshakeMsg = iota // devp2p message codes
DiscMsg handshakeMsg = 0x00
PingMsg discMsg = 0x01
PongMsg pingMsg = 0x02
GetPeersMsg pongMsg = 0x03
PeersMsg getPeersMsg = 0x04
offset = 16 peersMsg = 0x05
) )
type ProtocolState uint8 // handshake is the structure of a handshake list.
type handshake struct {
const ( Version uint64
nullState = iota ID string
handshakeReceived Caps []Cap
) ListenPort uint64
NodeID []byte
type DiscReason byte
const (
// Values are given explicitly instead of by iota because these values are
// defined by the wire protocol spec; it is easier for humans to ensure
// correctness when values are explicit.
DiscRequested = 0x00
DiscNetworkError = 0x01
DiscProtocolError = 0x02
DiscUselessPeer = 0x03
DiscTooManyPeers = 0x04
DiscAlreadyConnected = 0x05
DiscIncompatibleVersion = 0x06
DiscInvalidIdentity = 0x07
DiscQuitting = 0x08
DiscUnexpectedIdentity = 0x09
DiscSelf = 0x0a
DiscReadTimeout = 0x0b
DiscSubprotocolError = 0x10
)
var discReasonToString = map[DiscReason]string{
DiscRequested: "Disconnect requested",
DiscNetworkError: "Network error",
DiscProtocolError: "Breach of protocol",
DiscUselessPeer: "Useless peer",
DiscTooManyPeers: "Too many peers",
DiscAlreadyConnected: "Already connected",
DiscIncompatibleVersion: "Incompatible P2P protocol version",
DiscInvalidIdentity: "Invalid node identity",
DiscQuitting: "Client quitting",
DiscUnexpectedIdentity: "Unexpected identity",
DiscSelf: "Connected to self",
DiscReadTimeout: "Read timeout",
DiscSubprotocolError: "Subprotocol error",
} }
func (d DiscReason) String() string { func (h *handshake) String() string {
if len(discReasonToString) < int(d) { return h.ID
return "Unknown" }
func (h *handshake) Pubkey() []byte {
return h.NodeID
}
// Cap is the structure of a peer capability.
type Cap struct {
Name string
Version uint
}
func (cap Cap) RlpData() interface{} {
return []interface{}{cap.Name, cap.Version}
}
type capsByName []Cap
func (cs capsByName) Len() int { return len(cs) }
func (cs capsByName) Less(i, j int) bool { return cs[i].Name < cs[j].Name }
func (cs capsByName) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
type baseProtocol struct {
rw MsgReadWriter
peer *Peer
}
func runBaseProtocol(peer *Peer, rw MsgReadWriter) error {
bp := &baseProtocol{rw, peer}
if err := bp.doHandshake(rw); err != nil {
return err
} }
// run main loop
return discReasonToString[d] quit := make(chan error, 1)
} go func() {
for {
type BaseProtocol struct { if err := bp.handle(rw); err != nil {
peer *Peer quit <- err
state ProtocolState break
stateLock sync.RWMutex }
}
func NewBaseProtocol(peer *Peer) *BaseProtocol {
self := &BaseProtocol{
peer: peer,
}
return self
}
func (self *BaseProtocol) Start() {
if self.peer != nil {
self.peer.Write("", self.peer.Server().Handshake())
go self.peer.Messenger().PingPong(
pingTimeout*time.Second,
pingGracePeriod*time.Second,
self.Ping,
self.Timeout,
)
}
}
func (self *BaseProtocol) Stop() {
}
func (self *BaseProtocol) Ping() {
msg, _ := NewMsg(PingMsg)
self.peer.Write("", msg)
}
func (self *BaseProtocol) Timeout() {
self.peerError(PingTimeout, "")
}
func (self *BaseProtocol) Name() string {
return ""
}
func (self *BaseProtocol) Offset() MsgCode {
return offset
}
func (self *BaseProtocol) CheckState(state ProtocolState) bool {
self.stateLock.RLock()
self.stateLock.RUnlock()
if self.state != state {
return false
} else {
return true
}
}
func (self *BaseProtocol) HandleIn(msg *Msg, response chan *Msg) {
if msg.Code() == HandshakeMsg {
self.handleHandshake(msg)
} else {
if !self.CheckState(handshakeReceived) {
self.peerError(ProtocolBreach, "message code %v not allowed", msg.Code())
close(response)
return
} }
switch msg.Code() { }()
case DiscMsg: return bp.loop(quit)
logger.Infof("Disconnect requested from peer %v, reason", DiscReason(msg.Data().Get(0).Uint())) }
self.peer.Server().PeerDisconnect() <- DisconnectRequest{
addr: self.peer.Address, var pingTimeout = 2 * time.Second
reason: DiscRequested,
func (bp *baseProtocol) loop(quit <-chan error) error {
ping := time.NewTimer(pingTimeout)
activity := bp.peer.activity.Subscribe(time.Time{})
lastActive := time.Time{}
defer ping.Stop()
defer activity.Unsubscribe()
getPeersTick := time.NewTicker(10 * time.Second)
defer getPeersTick.Stop()
err := bp.rw.EncodeMsg(getPeersMsg)
for err == nil {
select {
case err = <-quit:
return err
case <-getPeersTick.C:
err = bp.rw.EncodeMsg(getPeersMsg)
case event := <-activity.Chan():
ping.Reset(pingTimeout)
lastActive = event.(time.Time)
case t := <-ping.C:
if lastActive.Add(pingTimeout * 2).Before(t) {
err = newPeerError(errPingTimeout, "")
} else if lastActive.Add(pingTimeout).Before(t) {
err = bp.rw.EncodeMsg(pingMsg)
} }
case PingMsg:
out, _ := NewMsg(PongMsg)
response <- out
case PongMsg:
case GetPeersMsg:
// Peer asked for list of connected peers
if out, err := self.peer.Server().PeersMessage(); err != nil {
response <- out
}
case PeersMsg:
self.handlePeers(msg)
default:
self.peerError(InvalidMsgCode, "unknown message code %v", msg.Code())
} }
} }
close(response) return err
} }
func (self *BaseProtocol) HandleOut(msg *Msg) (allowed bool) { func (bp *baseProtocol) handle(rw MsgReadWriter) error {
// somewhat overly paranoid msg, err := rw.ReadMsg()
allowed = msg.Code() == HandshakeMsg || msg.Code() == DiscMsg || msg.Code() < self.Offset() && self.CheckState(handshakeReceived) if err != nil {
return return err
}
func (self *BaseProtocol) peerError(errorCode ErrorCode, format string, v ...interface{}) {
err := NewPeerError(errorCode, format, v...)
logger.Warnln(err)
fmt.Println(self.peer, err)
if self.peer != nil {
self.peer.PeerErrorChan() <- err
} }
} if msg.Size > baseProtocolMaxMsgSize {
return newPeerError(errMisc, "message too big")
func (self *BaseProtocol) handlePeers(msg *Msg) {
it := msg.Data().NewIterator()
for it.Next() {
ip := net.IP(it.Value().Get(0).Bytes())
port := it.Value().Get(1).Uint()
address := &net.TCPAddr{IP: ip, Port: int(port)}
go self.peer.Server().PeerConnect(address)
} }
// make sure that the payload has been fully consumed
defer msg.Discard()
switch msg.Code {
case handshakeMsg:
return newPeerError(errProtocolBreach, "extra handshake received")
case discMsg:
var reason DiscReason
if err := msg.Decode(&reason); err != nil {
return err
}
bp.peer.Disconnect(reason)
return nil
case pingMsg:
return bp.rw.EncodeMsg(pongMsg)
case pongMsg:
case getPeersMsg:
peers := bp.peerList()
// this is dangerous. the spec says that we should _delay_
// sending the response if no new information is available.
// this means that would need to send a response later when
// new peers become available.
//
// TODO: add event mechanism to notify baseProtocol for new peers
if len(peers) > 0 {
return bp.rw.EncodeMsg(peersMsg, peers)
}
case peersMsg:
var peers []*peerAddr
if err := msg.Decode(&peers); err != nil {
return err
}
for _, addr := range peers {
bp.peer.Debugf("received peer suggestion: %v", addr)
bp.peer.newPeerAddr <- addr
}
default:
return newPeerError(errInvalidMsgCode, "unknown message code %v", msg.Code)
}
return nil
} }
func (self *BaseProtocol) handleHandshake(msg *Msg) { func (bp *baseProtocol) doHandshake(rw MsgReadWriter) error {
self.stateLock.Lock() // send our handshake
defer self.stateLock.Unlock() if err := rw.WriteMsg(bp.handshakeMsg()); err != nil {
if self.state != nullState { return err
self.peerError(ProtocolBreach, "extra handshake")
return
} }
c := msg.Data() // read and handle remote handshake
msg, err := rw.ReadMsg()
if err != nil {
return err
}
if msg.Code != handshakeMsg {
return newPeerError(errProtocolBreach, "first message must be handshake, got %x", msg.Code)
}
if msg.Size > baseProtocolMaxMsgSize {
return newPeerError(errMisc, "message too big")
}
var hs handshake
if err := msg.Decode(&hs); err != nil {
return err
}
// validate handshake info
if hs.Version != baseProtocolVersion {
return newPeerError(errP2PVersionMismatch, "Require protocol %d, received %d\n",
baseProtocolVersion, hs.Version)
}
if len(hs.NodeID) == 0 {
return newPeerError(errPubkeyMissing, "")
}
if len(hs.NodeID) != 64 {
return newPeerError(errPubkeyInvalid, "require 512 bit, got %v", len(hs.NodeID)*8)
}
if da := bp.peer.dialAddr; da != nil {
// verify that the peer we wanted to connect to
// actually holds the target public key.
if da.Pubkey != nil && !bytes.Equal(da.Pubkey, hs.NodeID) {
return newPeerError(errPubkeyForbidden, "dial address pubkey mismatch")
}
}
pa := newPeerAddr(bp.peer.conn.RemoteAddr(), hs.NodeID)
if err := bp.peer.pubkeyHook(pa); err != nil {
return newPeerError(errPubkeyForbidden, "%v", err)
}
// TODO: remove Caps with empty name
var addr *peerAddr
if hs.ListenPort != 0 {
addr = newPeerAddr(bp.peer.conn.RemoteAddr(), hs.NodeID)
addr.Port = hs.ListenPort
}
bp.peer.setHandshakeInfo(&hs, addr, hs.Caps)
bp.peer.startSubprotocols(hs.Caps)
return nil
}
func (bp *baseProtocol) handshakeMsg() Msg {
var ( var (
p2pVersion = c.Get(0).Uint() port uint64
id = c.Get(1).Str() caps []interface{}
caps = c.Get(2)
port = c.Get(3).Uint()
pubkey = c.Get(4).Bytes()
) )
fmt.Printf("handshake received %v, %v, %v, %v, %v ", p2pVersion, id, caps, port, pubkey) if bp.peer.ourListenAddr != nil {
port = bp.peer.ourListenAddr.Port
// Check correctness of p2p protocol version
if p2pVersion != P2PVersion {
self.peerError(P2PVersionMismatch, "Require protocol %d, received %d\n", P2PVersion, p2pVersion)
return
} }
for _, proto := range bp.peer.protocols {
// Handle the pub key (validation, uniqueness) caps = append(caps, proto.cap())
if len(pubkey) == 0 {
self.peerError(PubkeyMissing, "not supplied in handshake.")
return
} }
return NewMsg(handshakeMsg,
if len(pubkey) != 64 { baseProtocolVersion,
self.peerError(PubkeyInvalid, "require 512 bit, got %v", len(pubkey)*8) bp.peer.ourID.String(),
return caps,
} port,
bp.peer.ourID.Pubkey()[1:],
// Self connect detection )
if bytes.Compare(self.peer.Server().ClientIdentity().Pubkey()[1:], pubkey) == 0 { }
self.peerError(PubkeyForbidden, "not allowed to connect to self")
return func (bp *baseProtocol) peerList() []ethutil.RlpEncodable {
} peers := bp.peer.otherPeers()
ds := make([]ethutil.RlpEncodable, 0, len(peers))
// register pubkey on server. this also sets the pubkey on the peer (need lock) for _, p := range peers {
if err := self.peer.Server().RegisterPubkey(self.peer, pubkey); err != nil { p.infolock.Lock()
self.peerError(PubkeyForbidden, err.Error()) addr := p.listenAddr
return p.infolock.Unlock()
} // filter out this peer and peers that are not listening or
// have not completed the handshake.
// check port // TODO: track previously sent peers and exclude them as well.
if self.peer.Inbound { if p == bp.peer || addr == nil {
uint16port := uint16(port) continue
if self.peer.Port > 0 && self.peer.Port != uint16port { }
self.peerError(PortMismatch, "port mismatch: %v != %v", self.peer.Port, port) ds = append(ds, addr)
return }
} else { ourAddr := bp.peer.ourListenAddr
self.peer.Port = uint16port if ourAddr != nil && !ourAddr.IP.IsLoopback() && !ourAddr.IP.IsUnspecified() {
} ds = append(ds, ourAddr)
} }
return ds
capsIt := caps.NewIterator()
for capsIt.Next() {
cap := capsIt.Value().Str()
self.peer.Caps = append(self.peer.Caps, cap)
}
sort.Strings(self.peer.Caps)
self.peer.Messenger().AddProtocols(self.peer.Caps)
self.peer.Id = id
self.state = handshakeReceived
//p.ethereum.PushPeer(p)
// p.ethereum.reactor.Post("peerList", p.ethereum.Peers())
return
} }

825
p2p/server.go
View File

@ -2,21 +2,420 @@ package p2p
import ( import (
"bytes" "bytes"
"errors"
"fmt" "fmt"
"net" "net"
"sort"
"strconv"
"sync" "sync"
"time" "time"
logpkg "github.com/ethereum/go-ethereum/logger" "github.com/ethereum/go-ethereum/logger"
) )
const ( const (
outboundAddressPoolSize = 10 outboundAddressPoolSize = 500
disconnectGracePeriod = 2 defaultDialTimeout = 10 * time.Second
portMappingUpdateInterval = 15 * time.Minute
portMappingTimeout = 20 * time.Minute
) )
var srvlog = logger.NewLogger("P2P Server")
// Server manages all peer connections.
//
// The fields of Server are used as configuration parameters.
// You should set them before starting the Server. Fields may not be
// modified while the server is running.
type Server struct {
// This field must be set to a valid client identity.
Identity ClientIdentity
// MaxPeers is the maximum number of peers that can be
// connected. It must be greater than zero.
MaxPeers int
// Protocols should contain the protocols supported
// by the server. Matching protocols are launched for
// each peer.
Protocols []Protocol
// If Blacklist is set to a non-nil value, the given Blacklist
// is used to verify peer connections.
Blacklist Blacklist
// If ListenAddr is set to a non-nil address, the server
// will listen for incoming connections.
//
// If the port is zero, the operating system will pick a port. The
// ListenAddr field will be updated with the actual address when
// the server is started.
ListenAddr 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
// If Dialer is set to a non-nil value, the given Dialer
// is used to dial outbound peer connections.
Dialer *net.Dialer
// If NoDial is true, the server will not dial any peers.
NoDial bool
// Hook for testing. This is useful because we can inhibit
// the whole protocol stack.
newPeerFunc peerFunc
lock sync.RWMutex
running bool
listener net.Listener
laddr *net.TCPAddr // real listen addr
peers []*Peer
peerSlots chan int
peerCount int
quit chan struct{}
wg sync.WaitGroup
peerConnect chan *peerAddr
peerDisconnect chan *Peer
}
// NAT is implemented by NAT traversal methods.
type NAT interface {
GetExternalAddress() (net.IP, error)
AddPortMapping(protocol string, extport, intport int, name string, lifetime time.Duration) error
DeletePortMapping(protocol string, extport, intport int) error
// Should return name of the method.
String() string
}
type peerFunc func(srv *Server, c net.Conn, dialAddr *peerAddr) *Peer
// Peers returns all connected peers.
func (srv *Server) Peers() (peers []*Peer) {
srv.lock.RLock()
defer srv.lock.RUnlock()
for _, peer := range srv.peers {
if peer != nil {
peers = append(peers, peer)
}
}
return
}
// PeerCount returns the number of connected peers.
func (srv *Server) PeerCount() int {
srv.lock.RLock()
defer srv.lock.RUnlock()
return srv.peerCount
}
// SuggestPeer injects an address into the outbound address pool.
func (srv *Server) SuggestPeer(ip net.IP, port int, nodeID []byte) {
select {
case srv.peerConnect <- &peerAddr{ip, uint64(port), nodeID}:
default: // don't block
}
}
// Broadcast sends an RLP-encoded message to all connected peers.
// This method is deprecated and will be removed later.
func (srv *Server) Broadcast(protocol string, code uint64, data ...interface{}) {
var payload []byte
if data != nil {
payload = encodePayload(data...)
}
srv.lock.RLock()
defer srv.lock.RUnlock()
for _, peer := range srv.peers {
if peer != nil {
var msg = Msg{Code: code}
if data != nil {
msg.Payload = bytes.NewReader(payload)
msg.Size = uint32(len(payload))
}
peer.writeProtoMsg(protocol, msg)
}
}
}
// Start starts running the server.
// Servers can be re-used and started again after stopping.
func (srv *Server) Start() (err error) {
srv.lock.Lock()
defer srv.lock.Unlock()
if srv.running {
return errors.New("server already running")
}
srvlog.Infoln("Starting Server")
// initialize fields
if srv.Identity == nil {
return fmt.Errorf("Server.Identity must be set to a non-nil identity")
}
if srv.MaxPeers <= 0 {
return fmt.Errorf("Server.MaxPeers must be > 0")
}
srv.quit = make(chan struct{})
srv.peers = make([]*Peer, srv.MaxPeers)
srv.peerSlots = make(chan int, srv.MaxPeers)
srv.peerConnect = make(chan *peerAddr, outboundAddressPoolSize)
srv.peerDisconnect = make(chan *Peer)
if srv.newPeerFunc == nil {
srv.newPeerFunc = newServerPeer
}
if srv.Blacklist == nil {
srv.Blacklist = NewBlacklist()
}
if srv.Dialer == nil {
srv.Dialer = &net.Dialer{Timeout: defaultDialTimeout}
}
if srv.ListenAddr != "" {
if err := srv.startListening(); err != nil {
return err
}
}
if !srv.NoDial {
srv.wg.Add(1)
go srv.dialLoop()
}
if srv.NoDial && srv.ListenAddr == "" {
srvlog.Warnln("I will be kind-of useless, neither dialing nor listening.")
}
// make all slots available
for i := range srv.peers {
srv.peerSlots <- i
}
// note: discLoop is not part of WaitGroup
go srv.discLoop()
srv.running = true
return nil
}
func (srv *Server) startListening() error {
listener, err := net.Listen("tcp", srv.ListenAddr)
if err != nil {
return err
}
srv.ListenAddr = listener.Addr().String()
srv.laddr = listener.Addr().(*net.TCPAddr)
srv.listener = listener
srv.wg.Add(1)
go srv.listenLoop()
if !srv.laddr.IP.IsLoopback() && srv.NAT != nil {
srv.wg.Add(1)
go srv.natLoop(srv.laddr.Port)
}
return nil
}
// Stop terminates the server and all active peer connections.
// It blocks until all active connections have been closed.
func (srv *Server) Stop() {
srv.lock.Lock()
if !srv.running {
srv.lock.Unlock()
return
}
srv.running = false
srv.lock.Unlock()
srvlog.Infoln("Stopping server")
if srv.listener != nil {
// this unblocks listener Accept
srv.listener.Close()
}
close(srv.quit)
for _, peer := range srv.Peers() {
peer.Disconnect(DiscQuitting)
}
srv.wg.Wait()
// wait till they actually disconnect
// this is checked by claiming all peerSlots.
// slots become available as the peers disconnect.
for i := 0; i < cap(srv.peerSlots); i++ {
<-srv.peerSlots
}
// terminate discLoop
close(srv.peerDisconnect)
}
func (srv *Server) discLoop() {
for peer := range srv.peerDisconnect {
// peer has just disconnected. free up its slot.
srvlog.Infof("%v is gone", peer)
srv.peerSlots <- peer.slot
srv.lock.Lock()
srv.peers[peer.slot] = nil
srv.lock.Unlock()
}
}
// main loop for adding connections via listening
func (srv *Server) listenLoop() {
defer srv.wg.Done()
srvlog.Infoln("Listening on", srv.listener.Addr())
for {
select {
case slot := <-srv.peerSlots:
conn, err := srv.listener.Accept()
if err != nil {
srv.peerSlots <- slot
return
}
srvlog.Debugf("Accepted conn %v (slot %d)\n", conn.RemoteAddr(), slot)
srv.addPeer(conn, nil, slot)
case <-srv.quit:
return
}
}
}
func (srv *Server) natLoop(port int) {
defer srv.wg.Done()
for {
srv.updatePortMapping(port)
select {
case <-time.After(portMappingUpdateInterval):
// one more round
case <-srv.quit:
srv.removePortMapping(port)
return
}
}
}
func (srv *Server) updatePortMapping(port int) {
srvlog.Infoln("Attempting to map port", port, "with", srv.NAT)
err := srv.NAT.AddPortMapping("tcp", port, port, "ethereum p2p", portMappingTimeout)
if err != nil {
srvlog.Errorln("Port mapping error:", err)
return
}
extip, err := srv.NAT.GetExternalAddress()
if err != nil {
srvlog.Errorln("Error getting external IP:", err)
return
}
srv.lock.Lock()
extaddr := *(srv.listener.Addr().(*net.TCPAddr))
extaddr.IP = extip
srvlog.Infoln("Mapped port, external addr is", &extaddr)
srv.laddr = &extaddr
srv.lock.Unlock()
}
func (srv *Server) removePortMapping(port int) {
srvlog.Infoln("Removing port mapping for", port, "with", srv.NAT)
srv.NAT.DeletePortMapping("tcp", port, port)
}
func (srv *Server) dialLoop() {
defer srv.wg.Done()
var (
suggest chan *peerAddr
slot *int
slots = srv.peerSlots
)
for {
select {
case i := <-slots:
// we need a peer in slot i, slot reserved
slot = &i
// now we can watch for candidate peers in the next loop
suggest = srv.peerConnect
// do not consume more until candidate peer is found
slots = nil
case desc := <-suggest:
// candidate peer found, will dial out asyncronously
// if connection fails slot will be released
go srv.dialPeer(desc, *slot)
// we can watch if more peers needed in the next loop
slots = srv.peerSlots
// until then we dont care about candidate peers
suggest = nil
case <-srv.quit:
// give back the currently reserved slot
if slot != nil {
srv.peerSlots <- *slot
}
return
}
}
}
// connect to peer via dial out
func (srv *Server) dialPeer(desc *peerAddr, slot int) {
srvlog.Debugf("Dialing %v (slot %d)\n", desc, slot)
conn, err := srv.Dialer.Dial(desc.Network(), desc.String())
if err != nil {
srvlog.Errorf("Dial error: %v", err)
srv.peerSlots <- slot
return
}
go srv.addPeer(conn, desc, slot)
}
// creates the new peer object and inserts it into its slot
func (srv *Server) addPeer(conn net.Conn, desc *peerAddr, slot int) *Peer {
srv.lock.Lock()
defer srv.lock.Unlock()
if !srv.running {
conn.Close()
srv.peerSlots <- slot // release slot
return nil
}
peer := srv.newPeerFunc(srv, conn, desc)
peer.slot = slot
srv.peers[slot] = peer
srv.peerCount++
go func() { peer.loop(); srv.peerDisconnect <- peer }()
return peer
}
// removes peer: sending disconnect msg, stop peer, remove rom list/table, release slot
func (srv *Server) removePeer(peer *Peer) {
srv.lock.Lock()
defer srv.lock.Unlock()
srvlog.Debugf("Removing peer %v %v (slot %v)\n", peer, peer.slot)
if srv.peers[peer.slot] != peer {
srvlog.Warnln("Invalid peer to remove:", peer)
return
}
// remove from list and index
srv.peerCount--
srv.peers[peer.slot] = nil
// release slot to signal need for a new peer, last!
srv.peerSlots <- peer.slot
}
func (srv *Server) verifyPeer(addr *peerAddr) error {
if srv.Blacklist.Exists(addr.Pubkey) {
return errors.New("blacklisted")
}
if bytes.Equal(srv.Identity.Pubkey()[1:], addr.Pubkey) {
return newPeerError(errPubkeyForbidden, "not allowed to connect to srv")
}
srv.lock.RLock()
defer srv.lock.RUnlock()
for _, peer := range srv.peers {
if peer != nil {
id := peer.Identity()
if id != nil && bytes.Equal(id.Pubkey(), addr.Pubkey) {
return errors.New("already connected")
}
}
}
return nil
}
type Blacklist interface { type Blacklist interface {
Get([]byte) (bool, error) Get([]byte) (bool, error)
Put([]byte) error Put([]byte) error
@ -66,419 +465,3 @@ func (self *BlacklistMap) Delete(pubkey []byte) error {
delete(self.blacklist, string(pubkey)) delete(self.blacklist, string(pubkey))
return nil return nil
} }
type Server struct {
network Network
listening bool //needed?
dialing bool //needed?
closed bool
identity ClientIdentity
addr net.Addr
port uint16
protocols []string
quit chan chan bool
peersLock sync.RWMutex
maxPeers int
peers []*Peer
peerSlots chan int
peersTable map[string]int
peersMsg *Msg
peerCount int
peerConnect chan net.Addr
peerDisconnect chan DisconnectRequest
blacklist Blacklist
handlers Handlers
}
var logger = logpkg.NewLogger("P2P")
func New(network Network, addr net.Addr, identity ClientIdentity, handlers Handlers, maxPeers int, blacklist Blacklist) *Server {
// get alphabetical list of protocol names from handlers map
protocols := []string{}
for protocol := range handlers {
protocols = append(protocols, protocol)
}
sort.Strings(protocols)
_, port, _ := net.SplitHostPort(addr.String())
intport, _ := strconv.Atoi(port)
self := &Server{
// NewSimpleClientIdentity(clientIdentifier, version, customIdentifier)
network: network,
identity: identity,
addr: addr,
port: uint16(intport),
protocols: protocols,
quit: make(chan chan bool),
maxPeers: maxPeers,
peers: make([]*Peer, maxPeers),
peerSlots: make(chan int, maxPeers),
peersTable: make(map[string]int),
peerConnect: make(chan net.Addr, outboundAddressPoolSize),
peerDisconnect: make(chan DisconnectRequest),
blacklist: blacklist,
handlers: handlers,
}
for i := 0; i < maxPeers; i++ {
self.peerSlots <- i // fill up with indexes
}
return self
}
func (self *Server) NewAddr(host string, port int) (addr net.Addr, err error) {
addr, err = self.network.NewAddr(host, port)
return
}
func (self *Server) ParseAddr(address string) (addr net.Addr, err error) {
addr, err = self.network.ParseAddr(address)
return
}
func (self *Server) ClientIdentity() ClientIdentity {
return self.identity
}
func (self *Server) PeersMessage() (msg *Msg, err error) {
// TODO: memoize and reset when peers change
self.peersLock.RLock()
defer self.peersLock.RUnlock()
msg = self.peersMsg
if msg == nil {
var peerData []interface{}
for _, i := range self.peersTable {
peer := self.peers[i]
peerData = append(peerData, peer.Encode())
}
if len(peerData) == 0 {
err = fmt.Errorf("no peers")
} else {
msg, err = NewMsg(PeersMsg, peerData...)
self.peersMsg = msg //memoize
}
}
return
}
func (self *Server) Peers() (peers []*Peer) {
self.peersLock.RLock()
defer self.peersLock.RUnlock()
for _, peer := range self.peers {
if peer != nil {
peers = append(peers, peer)
}
}
return
}
func (self *Server) PeerCount() int {
self.peersLock.RLock()
defer self.peersLock.RUnlock()
return self.peerCount
}
var getPeersMsg, _ = NewMsg(GetPeersMsg)
func (self *Server) PeerConnect(addr net.Addr) {
// TODO: should buffer, filter and uniq
// send GetPeersMsg if not blocking
select {
case self.peerConnect <- addr: // not enough peers
self.Broadcast("", getPeersMsg)
default: // we dont care
}
}
func (self *Server) PeerDisconnect() chan DisconnectRequest {
return self.peerDisconnect
}
func (self *Server) Blacklist() Blacklist {
return self.blacklist
}
func (self *Server) Handlers() Handlers {
return self.handlers
}
func (self *Server) Broadcast(protocol string, msg *Msg) {
self.peersLock.RLock()
defer self.peersLock.RUnlock()
for _, peer := range self.peers {
if peer != nil {
peer.Write(protocol, msg)
}
}
}
// Start the server
func (self *Server) Start(listen bool, dial bool) {
self.network.Start()
if listen {
listener, err := self.network.Listener(self.addr)
if err != nil {
logger.Warnf("Error initializing listener: %v", err)
logger.Warnf("Connection listening disabled")
self.listening = false
} else {
self.listening = true
logger.Infoln("Listen on %v: ready and accepting connections", listener.Addr())
go self.inboundPeerHandler(listener)
}
}
if dial {
dialer, err := self.network.Dialer(self.addr)
if err != nil {
logger.Warnf("Error initializing dialer: %v", err)
logger.Warnf("Connection dialout disabled")
self.dialing = false
} else {
self.dialing = true
logger.Infoln("Dial peers watching outbound address pool")
go self.outboundPeerHandler(dialer)
}
}
logger.Infoln("server started")
}
func (self *Server) Stop() {
logger.Infoln("server stopping...")
// // quit one loop if dialing
if self.dialing {
logger.Infoln("stop dialout...")
dialq := make(chan bool)
self.quit <- dialq
<-dialq
fmt.Println("quit another")
}
// quit the other loop if listening
if self.listening {
logger.Infoln("stop listening...")
listenq := make(chan bool)
self.quit <- listenq
<-listenq
fmt.Println("quit one")
}
fmt.Println("quit waited")
logger.Infoln("stopping peers...")
peers := []net.Addr{}
self.peersLock.RLock()
self.closed = true
for _, peer := range self.peers {
if peer != nil {
peers = append(peers, peer.Address)
}
}
self.peersLock.RUnlock()
for _, address := range peers {
go self.removePeer(DisconnectRequest{
addr: address,
reason: DiscQuitting,
})
}
// wait till they actually disconnect
// this is checked by draining the peerSlots (slots are released back if a peer is removed)
i := 0
fmt.Println("draining peers")
FOR:
for {
select {
case slot := <-self.peerSlots:
i++
fmt.Printf("%v: found slot %v", i, slot)
if i == self.maxPeers {
break FOR
}
}
}
logger.Infoln("server stopped")
}
// main loop for adding connections via listening
func (self *Server) inboundPeerHandler(listener net.Listener) {
for {
select {
case slot := <-self.peerSlots:
go self.connectInboundPeer(listener, slot)
case errc := <-self.quit:
listener.Close()
fmt.Println("quit listenloop")
errc <- true
return
}
}
}
// main loop for adding outbound peers based on peerConnect address pool
// this same loop handles peer disconnect requests as well
func (self *Server) outboundPeerHandler(dialer Dialer) {
// addressChan initially set to nil (only watches peerConnect if we need more peers)
var addressChan chan net.Addr
slots := self.peerSlots
var slot *int
for {
select {
case i := <-slots:
// we need a peer in slot i, slot reserved
slot = &i
// now we can watch for candidate peers in the next loop
addressChan = self.peerConnect
// do not consume more until candidate peer is found
slots = nil
case address := <-addressChan:
// candidate peer found, will dial out asyncronously
// if connection fails slot will be released
go self.connectOutboundPeer(dialer, address, *slot)
// we can watch if more peers needed in the next loop
slots = self.peerSlots
// until then we dont care about candidate peers
addressChan = nil
case request := <-self.peerDisconnect:
go self.removePeer(request)
case errc := <-self.quit:
if addressChan != nil && slot != nil {
self.peerSlots <- *slot
}
fmt.Println("quit dialloop")
errc <- true
return
}
}
}
// check if peer address already connected
func (self *Server) connected(address net.Addr) (err error) {
self.peersLock.RLock()
defer self.peersLock.RUnlock()
// fmt.Printf("address: %v\n", address)
slot, found := self.peersTable[address.String()]
if found {
err = fmt.Errorf("already connected as peer %v (%v)", slot, address)
}
return
}
// connect to peer via listener.Accept()
func (self *Server) connectInboundPeer(listener net.Listener, slot int) {
var address net.Addr
conn, err := listener.Accept()
if err == nil {
address = conn.RemoteAddr()
err = self.connected(address)
if err != nil {
conn.Close()
}
}
if err != nil {
logger.Debugln(err)
self.peerSlots <- slot
} else {
fmt.Printf("adding %v\n", address)
go self.addPeer(conn, address, true, slot)
}
}
// connect to peer via dial out
func (self *Server) connectOutboundPeer(dialer Dialer, address net.Addr, slot int) {
var conn net.Conn
err := self.connected(address)
if err == nil {
conn, err = dialer.Dial(address.Network(), address.String())
}
if err != nil {
logger.Debugln(err)
self.peerSlots <- slot
} else {
go self.addPeer(conn, address, false, slot)
}
}
// creates the new peer object and inserts it into its slot
func (self *Server) addPeer(conn net.Conn, address net.Addr, inbound bool, slot int) {
self.peersLock.Lock()
defer self.peersLock.Unlock()
if self.closed {
fmt.Println("oopsy, not no longer need peer")
conn.Close() //oopsy our bad
self.peerSlots <- slot // release slot
} else {
peer := NewPeer(conn, address, inbound, self)
self.peers[slot] = peer
self.peersTable[address.String()] = slot
self.peerCount++
// reset peersmsg
self.peersMsg = nil
fmt.Printf("added peer %v %v (slot %v)\n", address, peer, slot)
peer.Start()
}
}
// removes peer: sending disconnect msg, stop peer, remove rom list/table, release slot
func (self *Server) removePeer(request DisconnectRequest) {
self.peersLock.Lock()
address := request.addr
slot := self.peersTable[address.String()]
peer := self.peers[slot]
fmt.Printf("removing peer %v %v (slot %v)\n", address, peer, slot)
if peer == nil {
logger.Debugf("already removed peer on %v", address)
self.peersLock.Unlock()
return
}
// remove from list and index
self.peerCount--
self.peers[slot] = nil
delete(self.peersTable, address.String())
// reset peersmsg
self.peersMsg = nil
fmt.Printf("removed peer %v (slot %v)\n", peer, slot)
self.peersLock.Unlock()
// sending disconnect message
disconnectMsg, _ := NewMsg(DiscMsg, request.reason)
peer.Write("", disconnectMsg)
// be nice and wait
time.Sleep(disconnectGracePeriod * time.Second)
// switch off peer and close connections etc.
fmt.Println("stopping peer")
peer.Stop()
fmt.Println("stopped peer")
// release slot to signal need for a new peer, last!
self.peerSlots <- slot
}
// fix handshake message to push to peers
func (self *Server) Handshake() *Msg {
fmt.Println(self.identity.Pubkey()[1:])
msg, _ := NewMsg(HandshakeMsg, P2PVersion, []byte(self.identity.String()), []interface{}{self.protocols}, self.port, self.identity.Pubkey()[1:])
return msg
}
func (self *Server) RegisterPubkey(candidate *Peer, pubkey []byte) error {
// Check for blacklisting
if self.blacklist.Exists(pubkey) {
return fmt.Errorf("blacklisted")
}
self.peersLock.RLock()
defer self.peersLock.RUnlock()
for _, peer := range self.peers {
if peer != nil && peer != candidate && bytes.Compare(peer.Pubkey, pubkey) == 0 {
return fmt.Errorf("already connected")
}
}
candidate.Pubkey = pubkey
return nil
}

315
p2p/server_test.go
View File

@ -2,207 +2,160 @@ package p2p
import ( import (
"bytes" "bytes"
"fmt" "io"
"net" "net"
"sync"
"testing" "testing"
"time" "time"
) )
type TestNetwork struct { func startTestServer(t *testing.T, pf peerFunc) *Server {
connections map[string]*TestNetworkConnection server := &Server{
dialer Dialer Identity: NewSimpleClientIdentity("clientIdentifier", "version", "customIdentifier", "pubkey"),
maxinbound int MaxPeers: 10,
} ListenAddr: "127.0.0.1:0",
newPeerFunc: pf,
func NewTestNetwork(maxinbound int) *TestNetwork {
connections := make(map[string]*TestNetworkConnection)
return &TestNetwork{
connections: connections,
dialer: &TestDialer{connections},
maxinbound: maxinbound,
} }
} if err := server.Start(); err != nil {
t.Fatalf("Could not start server: %v", err)
func (self *TestNetwork) Dialer(addr net.Addr) (Dialer, error) {
return self.dialer, nil
}
func (self *TestNetwork) Listener(addr net.Addr) (net.Listener, error) {
return &TestListener{
connections: self.connections,
addr: addr,
max: self.maxinbound,
}, nil
}
func (self *TestNetwork) Start() error {
return nil
}
func (self *TestNetwork) NewAddr(string, int) (addr net.Addr, err error) {
return
}
func (self *TestNetwork) ParseAddr(string) (addr net.Addr, err error) {
return
}
type TestAddr struct {
name string
}
func (self *TestAddr) String() string {
return self.name
}
func (*TestAddr) Network() string {
return "test"
}
type TestDialer struct {
connections map[string]*TestNetworkConnection
}
func (self *TestDialer) Dial(network string, addr string) (conn net.Conn, err error) {
address := &TestAddr{addr}
tconn := NewTestNetworkConnection(address)
self.connections[addr] = tconn
conn = net.Conn(tconn)
return
}
type TestListener struct {
connections map[string]*TestNetworkConnection
addr net.Addr
max int
i int
}
func (self *TestListener) Accept() (conn net.Conn, err error) {
self.i++
if self.i > self.max {
err = fmt.Errorf("no more")
} else {
addr := &TestAddr{fmt.Sprintf("inboundpeer-%d", self.i)}
tconn := NewTestNetworkConnection(addr)
key := tconn.RemoteAddr().String()
self.connections[key] = tconn
conn = net.Conn(tconn)
fmt.Printf("accepted connection from: %v \n", addr)
} }
return return server
} }
func (self *TestListener) Close() error { func TestServerListen(t *testing.T) {
return nil defer testlog(t).detach()
}
func (self *TestListener) Addr() net.Addr { // start the test server
return self.addr connected := make(chan *Peer)
} srv := startTestServer(t, func(srv *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
if conn == nil {
func SetupTestServer(handlers Handlers) (network *TestNetwork, server *Server) { t.Error("peer func called with nil conn")
network = NewTestNetwork(1)
addr := &TestAddr{"test:30303"}
identity := NewSimpleClientIdentity("clientIdentifier", "version", "customIdentifier", "pubkey")
maxPeers := 2
if handlers == nil {
handlers = make(Handlers)
}
blackist := NewBlacklist()
server = New(network, addr, identity, handlers, maxPeers, blackist)
fmt.Println(server.identity.Pubkey())
return
}
func TestServerListener(t *testing.T) {
network, server := SetupTestServer(nil)
server.Start(true, false)
time.Sleep(10 * time.Millisecond)
server.Stop()
peer1, ok := network.connections["inboundpeer-1"]
if !ok {
t.Error("not found inbound peer 1")
} else {
fmt.Printf("out: %v\n", peer1.Out)
if len(peer1.Out) != 2 {
t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out))
} }
} if dialAddr != nil {
t.Error("peer func called with non-nil dialAddr")
}
peer := newPeer(conn, nil, dialAddr)
connected <- peer
return peer
})
defer close(connected)
defer srv.Stop()
// dial the test server
conn, err := net.DialTimeout("tcp", srv.ListenAddr, 5*time.Second)
if err != nil {
t.Fatalf("could not dial: %v", err)
}
defer conn.Close()
select {
case peer := <-connected:
if peer.conn.LocalAddr().String() != conn.RemoteAddr().String() {
t.Errorf("peer started with wrong conn: got %v, want %v",
peer.conn.LocalAddr(), conn.RemoteAddr())
}
case <-time.After(1 * time.Second):
t.Error("server did not accept within one second")
}
} }
func TestServerDialer(t *testing.T) { func TestServerDial(t *testing.T) {
network, server := SetupTestServer(nil) defer testlog(t).detach()
server.Start(false, true)
server.peerConnect <- &TestAddr{"outboundpeer-1"} // run a fake TCP server to handle the connection.
time.Sleep(10 * time.Millisecond) listener, err := net.Listen("tcp", "127.0.0.1:0")
server.Stop() if err != nil {
peer1, ok := network.connections["outboundpeer-1"] t.Fatalf("could not setup listener: %v")
if !ok { }
t.Error("not found outbound peer 1") defer listener.Close()
} else { accepted := make(chan net.Conn)
fmt.Printf("out: %v\n", peer1.Out) go func() {
if len(peer1.Out) != 2 { conn, err := listener.Accept()
t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out)) if err != nil {
t.Error("acccept error:", err)
} }
conn.Close()
accepted <- conn
}()
// start the test server
connected := make(chan *Peer)
srv := startTestServer(t, func(srv *Server, conn net.Conn, dialAddr *peerAddr) *Peer {
if conn == nil {
t.Error("peer func called with nil conn")
}
peer := newPeer(conn, nil, dialAddr)
connected <- peer
return peer
})
defer close(connected)
defer srv.Stop()
// tell the server to connect.
connAddr := newPeerAddr(listener.Addr(), nil)
srv.peerConnect <- connAddr
select {
case conn := <-accepted:
select {
case peer := <-connected:
if peer.conn.RemoteAddr().String() != conn.LocalAddr().String() {
t.Errorf("peer started with wrong conn: got %v, want %v",
peer.conn.RemoteAddr(), conn.LocalAddr())
}
if peer.dialAddr != connAddr {
t.Errorf("peer started with wrong dialAddr: got %v, want %v",
peer.dialAddr, connAddr)
}
case <-time.After(1 * time.Second):
t.Error("server did not launch peer within one second")
}
case <-time.After(1 * time.Second):
t.Error("server did not connect within one second")
} }
} }
func TestServerBroadcast(t *testing.T) { func TestServerBroadcast(t *testing.T) {
handlers := make(Handlers) defer testlog(t).detach()
testProtocol := &TestProtocol{Msgs: []*Msg{}} var connected sync.WaitGroup
handlers["aaa"] = func(p *Peer) Protocol { return testProtocol } srv := startTestServer(t, func(srv *Server, c net.Conn, dialAddr *peerAddr) *Peer {
network, server := SetupTestServer(handlers) peer := newPeer(c, []Protocol{discard}, dialAddr)
server.Start(true, true) peer.startSubprotocols([]Cap{discard.cap()})
server.peerConnect <- &TestAddr{"outboundpeer-1"} connected.Done()
time.Sleep(10 * time.Millisecond) return peer
msg, _ := NewMsg(0) })
server.Broadcast("", msg) defer srv.Stop()
packet := Packet(0, 0)
time.Sleep(10 * time.Millisecond)
server.Stop()
peer1, ok := network.connections["outboundpeer-1"]
if !ok {
t.Error("not found outbound peer 1")
} else {
fmt.Printf("out: %v\n", peer1.Out)
if len(peer1.Out) != 3 {
t.Errorf("not enough messages sent to peer 1: %v ", len(peer1.Out))
} else {
if bytes.Compare(peer1.Out[1], packet) != 0 {
t.Errorf("incorrect broadcast packet %v != %v", peer1.Out[1], packet)
}
}
}
peer2, ok := network.connections["inboundpeer-1"]
if !ok {
t.Error("not found inbound peer 2")
} else {
fmt.Printf("out: %v\n", peer2.Out)
if len(peer1.Out) != 3 {
t.Errorf("not enough messages sent to peer 2: %v ", len(peer2.Out))
} else {
if bytes.Compare(peer2.Out[1], packet) != 0 {
t.Errorf("incorrect broadcast packet %v != %v", peer2.Out[1], packet)
}
}
}
}
func TestServerPeersMessage(t *testing.T) { // dial a bunch of conns
handlers := make(Handlers) var conns = make([]net.Conn, 8)
_, server := SetupTestServer(handlers) connected.Add(len(conns))
server.Start(true, true) deadline := time.Now().Add(3 * time.Second)
defer server.Stop() dialer := &net.Dialer{Deadline: deadline}
server.peerConnect <- &TestAddr{"outboundpeer-1"} for i := range conns {
time.Sleep(10 * time.Millisecond) conn, err := dialer.Dial("tcp", srv.ListenAddr)
peersMsg, err := server.PeersMessage() if err != nil {
fmt.Println(peersMsg) t.Fatalf("conn %d: dial error: %v", i, err)
if err != nil { }
t.Errorf("expect no error, got %v", err) defer conn.Close()
conn.SetDeadline(deadline)
conns[i] = conn
} }
if c := server.PeerCount(); c != 2 { connected.Wait()
t.Errorf("expect 2 peers, got %v", c)
// broadcast one message
srv.Broadcast("discard", 0, "foo")
goldbuf := new(bytes.Buffer)
writeMsg(goldbuf, NewMsg(16, "foo"))
golden := goldbuf.Bytes()
// check that the message has been written everywhere
for i, conn := range conns {
buf := make([]byte, len(golden))
if _, err := io.ReadFull(conn, buf); err != nil {
t.Errorf("conn %d: read error: %v", i, err)
} else if !bytes.Equal(buf, golden) {
t.Errorf("conn %d: msg mismatch\ngot: %x\nwant: %x", i, buf, golden)
}
} }
} }

28
p2p/testlog_test.go Normal file
View File

@ -0,0 +1,28 @@
package p2p
import (
"testing"
"github.com/ethereum/go-ethereum/logger"
)
type testLogger struct{ t *testing.T }
func testlog(t *testing.T) testLogger {
logger.Reset()
l := testLogger{t}
logger.AddLogSystem(l)
return l
}
func (testLogger) GetLogLevel() logger.LogLevel { return logger.DebugLevel }
func (testLogger) SetLogLevel(logger.LogLevel) {}
func (l testLogger) LogPrint(level logger.LogLevel, msg string) {
l.t.Logf("%s", msg)
}
func (testLogger) detach() {
logger.Flush()
logger.Reset()
}

40
p2p/testpoc7.go Normal file
View File

@ -0,0 +1,40 @@
// +build none
package main
import (
"fmt"
"log"
"net"
"os"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/p2p"
"github.com/obscuren/secp256k1-go"
)
func main() {
logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.DebugLevel))
pub, _ := secp256k1.GenerateKeyPair()
srv := p2p.Server{
MaxPeers: 10,
Identity: p2p.NewSimpleClientIdentity("test", "1.0", "", string(pub)),
ListenAddr: ":30303",
NAT: p2p.PMP(net.ParseIP("10.0.0.1")),
}
if err := srv.Start(); err != nil {
fmt.Println("could not start server:", err)
os.Exit(1)
}
// add seed peers
seed, err := net.ResolveTCPAddr("tcp", "poc-7.ethdev.com:30303")
if err != nil {
fmt.Println("couldn't resolve:", err)
os.Exit(1)
}
srv.SuggestPeer(seed.IP, seed.Port, nil)
select {}
}

81
rlp/decode.go
View File

@ -1,6 +1,7 @@
package rlp package rlp
import ( import (
"bufio"
"encoding/binary" "encoding/binary"
"errors" "errors"
"fmt" "fmt"
@ -24,8 +25,9 @@ type Decoder interface {
DecodeRLP(*Stream) error DecodeRLP(*Stream) error
} }
// Decode parses RLP-encoded data from r and stores the result // Decode parses RLP-encoded data from r and stores the result in the
// in the value pointed to by val. Val must be a non-nil pointer. // value pointed to by val. Val must be a non-nil pointer. If r does
// not implement ByteReader, Decode will do its own buffering.
// //
// Decode uses the following type-dependent decoding rules: // Decode uses the following type-dependent decoding rules:
// //
@ -66,10 +68,19 @@ type Decoder interface {
// //
// Non-empty interface types are not supported, nor are bool, float32, // Non-empty interface types are not supported, nor are bool, float32,
// float64, maps, channel types and functions. // float64, maps, channel types and functions.
func Decode(r ByteReader, val interface{}) error { func Decode(r io.Reader, val interface{}) error {
return NewStream(r).Decode(val) return NewStream(r).Decode(val)
} }
type decodeError struct {
msg string
typ reflect.Type
}
func (err decodeError) Error() string {
return fmt.Sprintf("rlp: %s for %v", err.msg, err.typ)
}
func makeNumDecoder(typ reflect.Type) decoder { func makeNumDecoder(typ reflect.Type) decoder {
kind := typ.Kind() kind := typ.Kind()
switch { switch {
@ -83,8 +94,11 @@ func makeNumDecoder(typ reflect.Type) decoder {
} }
func decodeInt(s *Stream, val reflect.Value) error { func decodeInt(s *Stream, val reflect.Value) error {
num, err := s.uint(val.Type().Bits()) typ := val.Type()
if err != nil { num, err := s.uint(typ.Bits())
if err == errUintOverflow {
return decodeError{"input string too long", typ}
} else if err != nil {
return err return err
} }
val.SetInt(int64(num)) val.SetInt(int64(num))
@ -92,8 +106,11 @@ func decodeInt(s *Stream, val reflect.Value) error {
} }
func decodeUint(s *Stream, val reflect.Value) error { func decodeUint(s *Stream, val reflect.Value) error {
num, err := s.uint(val.Type().Bits()) typ := val.Type()
if err != nil { num, err := s.uint(typ.Bits())
if err == errUintOverflow {
return decodeError{"input string too big", typ}
} else if err != nil {
return err return err
} }
val.SetUint(num) val.SetUint(num)
@ -175,7 +192,7 @@ func decodeList(s *Stream, val reflect.Value, elemdec decoder, maxelem int) erro
i := 0 i := 0
for { for {
if i > maxelem { if i > maxelem {
return fmt.Errorf("rlp: input List has more than %d elements", maxelem) return decodeError{"input list has too many elements", val.Type()}
} }
if val.Kind() == reflect.Slice { if val.Kind() == reflect.Slice {
// grow slice if necessary // grow slice if necessary
@ -226,8 +243,6 @@ func decodeByteSlice(s *Stream, val reflect.Value) error {
return err return err
} }
var errStringDoesntFitArray = errors.New("rlp: string value doesn't fit into target array")
func decodeByteArray(s *Stream, val reflect.Value) error { func decodeByteArray(s *Stream, val reflect.Value) error {
kind, size, err := s.Kind() kind, size, err := s.Kind()
if err != nil { if err != nil {
@ -236,14 +251,14 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
switch kind { switch kind {
case Byte: case Byte:
if val.Len() == 0 { if val.Len() == 0 {
return errStringDoesntFitArray return decodeError{"input string too big", val.Type()}
} }
bv, _ := s.Uint() bv, _ := s.Uint()
val.Index(0).SetUint(bv) val.Index(0).SetUint(bv)
zero(val, 1) zero(val, 1)
case String: case String:
if uint64(val.Len()) < size { if uint64(val.Len()) < size {
return errStringDoesntFitArray return decodeError{"input string too big", val.Type()}
} }
slice := val.Slice(0, int(size)).Interface().([]byte) slice := val.Slice(0, int(size)).Interface().([]byte)
if err := s.readFull(slice); err != nil { if err := s.readFull(slice); err != nil {
@ -293,7 +308,7 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
} }
} }
if err = s.ListEnd(); err == errNotAtEOL { if err = s.ListEnd(); err == errNotAtEOL {
err = errors.New("rlp: input List has too many elements") err = decodeError{"input list has too many elements", typ}
} }
return err return err
} }
@ -432,8 +447,23 @@ type Stream struct {
type listpos struct{ pos, size uint64 } type listpos struct{ pos, size uint64 }
func NewStream(r ByteReader) *Stream { // NewStream creates a new stream reading from r.
return &Stream{r: r, uintbuf: make([]byte, 8), kind: -1} // If r does not implement ByteReader, the Stream will
// introduce its own buffering.
func NewStream(r io.Reader) *Stream {
s := new(Stream)
s.Reset(r)
return s
}
// NewListStream creates a new stream that pretends to be positioned
// at an encoded list of the given length.
func NewListStream(r io.Reader, len uint64) *Stream {
s := new(Stream)
s.Reset(r)
s.kind = List
s.size = len
return s
} }
// Bytes reads an RLP string and returns its contents as a byte slice. // Bytes reads an RLP string and returns its contents as a byte slice.
@ -459,6 +489,8 @@ func (s *Stream) Bytes() ([]byte, error) {
} }
} }
var errUintOverflow = errors.New("rlp: uint overflow")
// Uint reads an RLP string of up to 8 bytes and returns its contents // Uint reads an RLP string of up to 8 bytes and returns its contents
// as an unsigned integer. If the input does not contain an RLP string, the // as an unsigned integer. If the input does not contain an RLP string, the
// returned error will be ErrExpectedString. // returned error will be ErrExpectedString.
@ -477,7 +509,7 @@ func (s *Stream) uint(maxbits int) (uint64, error) {
return uint64(s.byteval), nil return uint64(s.byteval), nil
case String: case String:
if size > uint64(maxbits/8) { if size > uint64(maxbits/8) {
return 0, fmt.Errorf("rlp: string is larger than %d bits", maxbits) return 0, errUintOverflow
} }
return s.readUint(byte(size)) return s.readUint(byte(size))
default: default:
@ -543,6 +575,23 @@ func (s *Stream) Decode(val interface{}) error {
return info.decoder(s, rval.Elem()) return info.decoder(s, rval.Elem())
} }
// Reset discards any information about the current decoding context
// and starts reading from r. If r does not also implement ByteReader,
// Stream will do its own buffering.
func (s *Stream) Reset(r io.Reader) {
bufr, ok := r.(ByteReader)
if !ok {
bufr = bufio.NewReader(r)
}
s.r = bufr
s.stack = s.stack[:0]
s.size = 0
s.kind = -1
if s.uintbuf == nil {
s.uintbuf = make([]byte, 8)
}
}
// Kind returns the kind and size of the next value in the // Kind returns the kind and size of the next value in the
// input stream. // input stream.
// //

89
rlp/decode_test.go
View File

@ -3,7 +3,6 @@ package rlp
import ( import (
"bytes" "bytes"
"encoding/hex" "encoding/hex"
"errors"
"fmt" "fmt"
"io" "io"
"math/big" "math/big"
@ -54,6 +53,24 @@ func TestStreamKind(t *testing.T) {
} }
} }
func TestNewListStream(t *testing.T) {
ls := NewListStream(bytes.NewReader(unhex("0101010101")), 3)
if k, size, err := ls.Kind(); k != List || size != 3 || err != nil {
t.Errorf("Kind() returned (%v, %d, %v), expected (List, 3, nil)", k, size, err)
}
if size, err := ls.List(); size != 3 || err != nil {
t.Errorf("List() returned (%d, %v), expected (3, nil)", size, err)
}
for i := 0; i < 3; i++ {
if val, err := ls.Uint(); val != 1 || err != nil {
t.Errorf("Uint() returned (%d, %v), expected (1, nil)", val, err)
}
}
if err := ls.ListEnd(); err != nil {
t.Errorf("ListEnd() returned %v, expected (3, nil)", err)
}
}
func TestStreamErrors(t *testing.T) { func TestStreamErrors(t *testing.T) {
type calls []string type calls []string
tests := []struct { tests := []struct {
@ -69,7 +86,7 @@ func TestStreamErrors(t *testing.T) {
{"81", calls{"Bytes"}, io.ErrUnexpectedEOF}, {"81", calls{"Bytes"}, io.ErrUnexpectedEOF},
{"81", calls{"Uint"}, io.ErrUnexpectedEOF}, {"81", calls{"Uint"}, io.ErrUnexpectedEOF},
{"BFFFFFFFFFFFFFFF", calls{"Bytes"}, io.ErrUnexpectedEOF}, {"BFFFFFFFFFFFFFFF", calls{"Bytes"}, io.ErrUnexpectedEOF},
{"89000000000000000001", calls{"Uint"}, errors.New("rlp: string is larger than 64 bits")}, {"89000000000000000001", calls{"Uint"}, errUintOverflow},
{"00", calls{"List"}, ErrExpectedList}, {"00", calls{"List"}, ErrExpectedList},
{"80", calls{"List"}, ErrExpectedList}, {"80", calls{"List"}, ErrExpectedList},
{"C0", calls{"List", "Uint"}, EOL}, {"C0", calls{"List", "Uint"}, EOL},
@ -163,7 +180,7 @@ type decodeTest struct {
input string input string
ptr interface{} ptr interface{}
value interface{} value interface{}
error error error string
} }
type simplestruct struct { type simplestruct struct {
@ -196,8 +213,8 @@ var decodeTests = []decodeTest{
{input: "820505", ptr: new(uint32), value: uint32(0x0505)}, {input: "820505", ptr: new(uint32), value: uint32(0x0505)},
{input: "83050505", ptr: new(uint32), value: uint32(0x050505)}, {input: "83050505", ptr: new(uint32), value: uint32(0x050505)},
{input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)}, {input: "8405050505", ptr: new(uint32), value: uint32(0x05050505)},
{input: "850505050505", ptr: new(uint32), error: errors.New("rlp: string is larger than 32 bits")}, {input: "850505050505", ptr: new(uint32), error: "rlp: input string too big for uint32"},
{input: "C0", ptr: new(uint32), error: ErrExpectedString}, {input: "C0", ptr: new(uint32), error: ErrExpectedString.Error()},
// slices // slices
{input: "C0", ptr: new([]int), value: []int{}}, {input: "C0", ptr: new([]int), value: []int{}},
@ -206,7 +223,7 @@ var decodeTests = []decodeTest{
// arrays // arrays
{input: "C0", ptr: new([5]int), value: [5]int{}}, {input: "C0", ptr: new([5]int), value: [5]int{}},
{input: "C50102030405", ptr: new([5]int), value: [5]int{1, 2, 3, 4, 5}}, {input: "C50102030405", ptr: new([5]int), value: [5]int{1, 2, 3, 4, 5}},
{input: "C6010203040506", ptr: new([5]int), error: errors.New("rlp: input List has more than 5 elements")}, {input: "C6010203040506", ptr: new([5]int), error: "rlp: input list has too many elements for [5]int"},
// byte slices // byte slices
{input: "01", ptr: new([]byte), value: []byte{1}}, {input: "01", ptr: new([]byte), value: []byte{1}},
@ -214,7 +231,7 @@ var decodeTests = []decodeTest{
{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")}, {input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
{input: "C0", ptr: new([]byte), value: []byte{}}, {input: "C0", ptr: new([]byte), value: []byte{}},
{input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}}, {input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}},
{input: "C3820102", ptr: new([]byte), error: errors.New("rlp: string is larger than 8 bits")}, {input: "C3820102", ptr: new([]byte), error: "rlp: input string too big for uint8"},
// byte arrays // byte arrays
{input: "01", ptr: new([5]byte), value: [5]byte{1}}, {input: "01", ptr: new([5]byte), value: [5]byte{1}},
@ -222,9 +239,9 @@ var decodeTests = []decodeTest{
{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}}, {input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
{input: "C0", ptr: new([5]byte), value: [5]byte{}}, {input: "C0", ptr: new([5]byte), value: [5]byte{}},
{input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}}, {input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}},
{input: "C3820102", ptr: new([5]byte), error: errors.New("rlp: string is larger than 8 bits")}, {input: "C3820102", ptr: new([5]byte), error: "rlp: input string too big for uint8"},
{input: "86010203040506", ptr: new([5]byte), error: errStringDoesntFitArray}, {input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too big for [5]uint8"},
{input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF}, {input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF.Error()},
// byte array reuse (should be zeroed) // byte array reuse (should be zeroed)
{input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}}, {input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}},
@ -237,25 +254,25 @@ var decodeTests = []decodeTest{
// zero sized byte arrays // zero sized byte arrays
{input: "80", ptr: new([0]byte), value: [0]byte{}}, {input: "80", ptr: new([0]byte), value: [0]byte{}},
{input: "C0", ptr: new([0]byte), value: [0]byte{}}, {input: "C0", ptr: new([0]byte), value: [0]byte{}},
{input: "01", ptr: new([0]byte), error: errStringDoesntFitArray}, {input: "01", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
{input: "8101", ptr: new([0]byte), error: errStringDoesntFitArray}, {input: "8101", ptr: new([0]byte), error: "rlp: input string too big for [0]uint8"},
// strings // strings
{input: "00", ptr: new(string), value: "\000"}, {input: "00", ptr: new(string), value: "\000"},
{input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"}, {input: "8D6162636465666768696A6B6C6D", ptr: new(string), value: "abcdefghijklm"},
{input: "C0", ptr: new(string), error: ErrExpectedString}, {input: "C0", ptr: new(string), error: ErrExpectedString.Error()},
// big ints // big ints
{input: "01", ptr: new(*big.Int), value: big.NewInt(1)}, {input: "01", ptr: new(*big.Int), value: big.NewInt(1)},
{input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt}, {input: "89FFFFFFFFFFFFFFFFFF", ptr: new(*big.Int), value: veryBigInt},
{input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works {input: "10", ptr: new(big.Int), value: *big.NewInt(16)}, // non-pointer also works
{input: "C0", ptr: new(*big.Int), error: ErrExpectedString}, {input: "C0", ptr: new(*big.Int), error: ErrExpectedString.Error()},
// structs // structs
{input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}}, {input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}},
{input: "C105", ptr: new(simplestruct), value: simplestruct{5, ""}}, {input: "C105", ptr: new(simplestruct), value: simplestruct{5, ""}},
{input: "C50583343434", ptr: new(simplestruct), value: simplestruct{5, "444"}}, {input: "C50583343434", ptr: new(simplestruct), value: simplestruct{5, "444"}},
{input: "C3010101", ptr: new(simplestruct), error: errors.New("rlp: input List has too many elements")}, {input: "C3010101", ptr: new(simplestruct), error: "rlp: input list has too many elements for rlp.simplestruct"},
{ {
input: "C501C302C103", input: "C501C302C103",
ptr: new(recstruct), ptr: new(recstruct),
@ -286,20 +303,20 @@ var decodeTests = []decodeTest{
func intp(i int) *int { return &i } func intp(i int) *int { return &i }
func TestDecode(t *testing.T) { func runTests(t *testing.T, decode func([]byte, interface{}) error) {
for i, test := range decodeTests { for i, test := range decodeTests {
input, err := hex.DecodeString(test.input) input, err := hex.DecodeString(test.input)
if err != nil { if err != nil {
t.Errorf("test %d: invalid hex input %q", i, test.input) t.Errorf("test %d: invalid hex input %q", i, test.input)
continue continue
} }
err = Decode(bytes.NewReader(input), test.ptr) err = decode(input, test.ptr)
if err != nil && test.error == nil { if err != nil && test.error == "" {
t.Errorf("test %d: unexpected Decode error: %v\ndecoding into %T\ninput %q", t.Errorf("test %d: unexpected Decode error: %v\ndecoding into %T\ninput %q",
i, err, test.ptr, test.input) i, err, test.ptr, test.input)
continue continue
} }
if test.error != nil && fmt.Sprint(err) != fmt.Sprint(test.error) { if test.error != "" && fmt.Sprint(err) != test.error {
t.Errorf("test %d: Decode error mismatch\ngot %v\nwant %v\ndecoding into %T\ninput %q", t.Errorf("test %d: Decode error mismatch\ngot %v\nwant %v\ndecoding into %T\ninput %q",
i, err, test.error, test.ptr, test.input) i, err, test.error, test.ptr, test.input)
continue continue
@ -312,6 +329,40 @@ func TestDecode(t *testing.T) {
} }
} }
func TestDecodeWithByteReader(t *testing.T) {
runTests(t, func(input []byte, into interface{}) error {
return Decode(bytes.NewReader(input), into)
})
}
// dumbReader reads from a byte slice but does not
// implement ReadByte.
type dumbReader []byte
func (r *dumbReader) Read(buf []byte) (n int, err error) {
if len(*r) == 0 {
return 0, io.EOF
}
n = copy(buf, *r)
*r = (*r)[n:]
return n, nil
}
func TestDecodeWithNonByteReader(t *testing.T) {
runTests(t, func(input []byte, into interface{}) error {
r := dumbReader(input)
return Decode(&r, into)
})
}
func TestDecodeStreamReset(t *testing.T) {
s := NewStream(nil)
runTests(t, func(input []byte, into interface{}) error {
s.Reset(bytes.NewReader(input))
return s.Decode(into)
})
}
type testDecoder struct{ called bool } type testDecoder struct{ called bool }
func (t *testDecoder) DecodeRLP(s *Stream) error { func (t *testDecoder) DecodeRLP(s *Stream) error {