plugeth/swarm/swarm.go
Elad e8752f4e9f cmd/swarm, swarm: added access control functionality (#17404)
Co-authored-by: Janos Guljas <janos@resenje.org>
Co-authored-by: Anton Evangelatov <anton.evangelatov@gmail.com>
Co-authored-by: Balint Gabor <balint.g@gmail.com>
2018-08-15 17:41:52 +02:00

532 lines
15 KiB
Go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package swarm
import (
"bytes"
"context"
"crypto/ecdsa"
"fmt"
"io"
"math/big"
"net"
"path/filepath"
"strings"
"time"
"unicode"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/contracts/chequebook"
"github.com/ethereum/go-ethereum/contracts/ens"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/metrics"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/protocols"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/swarm/api"
httpapi "github.com/ethereum/go-ethereum/swarm/api/http"
"github.com/ethereum/go-ethereum/swarm/fuse"
"github.com/ethereum/go-ethereum/swarm/log"
"github.com/ethereum/go-ethereum/swarm/network"
"github.com/ethereum/go-ethereum/swarm/network/stream"
"github.com/ethereum/go-ethereum/swarm/pss"
"github.com/ethereum/go-ethereum/swarm/state"
"github.com/ethereum/go-ethereum/swarm/storage"
"github.com/ethereum/go-ethereum/swarm/storage/mock"
"github.com/ethereum/go-ethereum/swarm/storage/mru"
"github.com/ethereum/go-ethereum/swarm/tracing"
)
var (
startTime time.Time
updateGaugesPeriod = 5 * time.Second
startCounter = metrics.NewRegisteredCounter("stack,start", nil)
stopCounter = metrics.NewRegisteredCounter("stack,stop", nil)
uptimeGauge = metrics.NewRegisteredGauge("stack.uptime", nil)
requestsCacheGauge = metrics.NewRegisteredGauge("storage.cache.requests.size", nil)
)
// the swarm stack
type Swarm struct {
config *api.Config // swarm configuration
api *api.API // high level api layer (fs/manifest)
dns api.Resolver // DNS registrar
fileStore *storage.FileStore // distributed preimage archive, the local API to the storage with document level storage/retrieval support
streamer *stream.Registry
bzz *network.Bzz // the logistic manager
backend chequebook.Backend // simple blockchain Backend
privateKey *ecdsa.PrivateKey
corsString string
swapEnabled bool
lstore *storage.LocalStore // local store, needs to store for releasing resources after node stopped
sfs *fuse.SwarmFS // need this to cleanup all the active mounts on node exit
ps *pss.Pss
tracerClose io.Closer
}
type SwarmAPI struct {
Api *api.API
Backend chequebook.Backend
}
func (self *Swarm) API() *SwarmAPI {
return &SwarmAPI{
Api: self.api,
Backend: self.backend,
}
}
// creates a new swarm service instance
// implements node.Service
// If mockStore is not nil, it will be used as the storage for chunk data.
// MockStore should be used only for testing.
func NewSwarm(config *api.Config, mockStore *mock.NodeStore) (self *Swarm, err error) {
if bytes.Equal(common.FromHex(config.PublicKey), storage.ZeroAddr) {
return nil, fmt.Errorf("empty public key")
}
if bytes.Equal(common.FromHex(config.BzzKey), storage.ZeroAddr) {
return nil, fmt.Errorf("empty bzz key")
}
var backend chequebook.Backend
if config.SwapAPI != "" && config.SwapEnabled {
log.Info("connecting to SWAP API", "url", config.SwapAPI)
backend, err = ethclient.Dial(config.SwapAPI)
if err != nil {
return nil, fmt.Errorf("error connecting to SWAP API %s: %s", config.SwapAPI, err)
}
}
self = &Swarm{
config: config,
backend: backend,
privateKey: config.ShiftPrivateKey(),
}
log.Debug(fmt.Sprintf("Setting up Swarm service components"))
config.HiveParams.Discovery = true
log.Debug(fmt.Sprintf("-> swarm net store shared access layer to Swarm Chunk Store"))
nodeID, err := discover.HexID(config.NodeID)
if err != nil {
return nil, err
}
addr := &network.BzzAddr{
OAddr: common.FromHex(config.BzzKey),
UAddr: []byte(discover.NewNode(nodeID, net.IP{127, 0, 0, 1}, 30303, 30303).String()),
}
bzzconfig := &network.BzzConfig{
NetworkID: config.NetworkID,
OverlayAddr: addr.OAddr,
UnderlayAddr: addr.UAddr,
HiveParams: config.HiveParams,
LightNode: config.LightNodeEnabled,
}
stateStore, err := state.NewDBStore(filepath.Join(config.Path, "state-store.db"))
if err != nil {
return
}
// set up high level api
var resolver *api.MultiResolver
if len(config.EnsAPIs) > 0 {
opts := []api.MultiResolverOption{}
for _, c := range config.EnsAPIs {
tld, endpoint, addr := parseEnsAPIAddress(c)
r, err := newEnsClient(endpoint, addr, config, self.privateKey)
if err != nil {
return nil, err
}
opts = append(opts, api.MultiResolverOptionWithResolver(r, tld))
}
resolver = api.NewMultiResolver(opts...)
self.dns = resolver
}
self.lstore, err = storage.NewLocalStore(config.LocalStoreParams, mockStore)
if err != nil {
return
}
db := storage.NewDBAPI(self.lstore)
to := network.NewKademlia(
common.FromHex(config.BzzKey),
network.NewKadParams(),
)
delivery := stream.NewDelivery(to, db)
self.streamer = stream.NewRegistry(addr, delivery, db, stateStore, &stream.RegistryOptions{
SkipCheck: config.DeliverySkipCheck,
DoSync: config.SyncEnabled,
DoRetrieve: true,
SyncUpdateDelay: config.SyncUpdateDelay,
})
// set up NetStore, the cloud storage local access layer
netStore := storage.NewNetStore(self.lstore, self.streamer.Retrieve)
// Swarm Hash Merklised Chunking for Arbitrary-length Document/File storage
self.fileStore = storage.NewFileStore(netStore, self.config.FileStoreParams)
var resourceHandler *mru.Handler
rhparams := &mru.HandlerParams{}
resourceHandler = mru.NewHandler(rhparams)
resourceHandler.SetStore(netStore)
self.lstore.Validators = []storage.ChunkValidator{
storage.NewContentAddressValidator(storage.MakeHashFunc(storage.DefaultHash)),
resourceHandler,
}
// setup local store
log.Debug(fmt.Sprintf("Set up local storage"))
self.bzz = network.NewBzz(bzzconfig, to, stateStore, stream.Spec, self.streamer.Run)
// Pss = postal service over swarm (devp2p over bzz)
self.ps, err = pss.NewPss(to, config.Pss)
if err != nil {
return nil, err
}
if pss.IsActiveHandshake {
pss.SetHandshakeController(self.ps, pss.NewHandshakeParams())
}
self.api = api.NewAPI(self.fileStore, self.dns, resourceHandler, self.privateKey)
// Manifests for Smart Hosting
log.Debug(fmt.Sprintf("-> Web3 virtual server API"))
self.sfs = fuse.NewSwarmFS(self.api)
log.Debug("-> Initializing Fuse file system")
return self, nil
}
// parseEnsAPIAddress parses string according to format
// [tld:][contract-addr@]url and returns ENSClientConfig structure
// with endpoint, contract address and TLD.
func parseEnsAPIAddress(s string) (tld, endpoint string, addr common.Address) {
isAllLetterString := func(s string) bool {
for _, r := range s {
if !unicode.IsLetter(r) {
return false
}
}
return true
}
endpoint = s
if i := strings.Index(endpoint, ":"); i > 0 {
if isAllLetterString(endpoint[:i]) && len(endpoint) > i+2 && endpoint[i+1:i+3] != "//" {
tld = endpoint[:i]
endpoint = endpoint[i+1:]
}
}
if i := strings.Index(endpoint, "@"); i > 0 {
addr = common.HexToAddress(endpoint[:i])
endpoint = endpoint[i+1:]
}
return
}
// ensClient provides functionality for api.ResolveValidator
type ensClient struct {
*ens.ENS
*ethclient.Client
}
// newEnsClient creates a new ENS client for that is a consumer of
// a ENS API on a specific endpoint. It is used as a helper function
// for creating multiple resolvers in NewSwarm function.
func newEnsClient(endpoint string, addr common.Address, config *api.Config, privkey *ecdsa.PrivateKey) (*ensClient, error) {
log.Info("connecting to ENS API", "url", endpoint)
client, err := rpc.Dial(endpoint)
if err != nil {
return nil, fmt.Errorf("error connecting to ENS API %s: %s", endpoint, err)
}
ethClient := ethclient.NewClient(client)
ensRoot := config.EnsRoot
if addr != (common.Address{}) {
ensRoot = addr
} else {
a, err := detectEnsAddr(client)
if err == nil {
ensRoot = a
} else {
log.Warn(fmt.Sprintf("could not determine ENS contract address, using default %s", ensRoot), "err", err)
}
}
transactOpts := bind.NewKeyedTransactor(privkey)
dns, err := ens.NewENS(transactOpts, ensRoot, ethClient)
if err != nil {
return nil, err
}
log.Debug(fmt.Sprintf("-> Swarm Domain Name Registrar %v @ address %v", endpoint, ensRoot.Hex()))
return &ensClient{
ENS: dns,
Client: ethClient,
}, err
}
// detectEnsAddr determines the ENS contract address by getting both the
// version and genesis hash using the client and matching them to either
// mainnet or testnet addresses
func detectEnsAddr(client *rpc.Client) (common.Address, error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
var version string
if err := client.CallContext(ctx, &version, "net_version"); err != nil {
return common.Address{}, err
}
block, err := ethclient.NewClient(client).BlockByNumber(ctx, big.NewInt(0))
if err != nil {
return common.Address{}, err
}
switch {
case version == "1" && block.Hash() == params.MainnetGenesisHash:
log.Info("using Mainnet ENS contract address", "addr", ens.MainNetAddress)
return ens.MainNetAddress, nil
case version == "3" && block.Hash() == params.TestnetGenesisHash:
log.Info("using Testnet ENS contract address", "addr", ens.TestNetAddress)
return ens.TestNetAddress, nil
default:
return common.Address{}, fmt.Errorf("unknown version and genesis hash: %s %s", version, block.Hash())
}
}
/*
Start is called when the stack is started
* starts the network kademlia hive peer management
* (starts netStore level 0 api)
* starts DPA level 1 api (chunking -> store/retrieve requests)
* (starts level 2 api)
* starts http proxy server
* registers url scheme handlers for bzz, etc
* TODO: start subservices like sword, swear, swarmdns
*/
// implements the node.Service interface
func (self *Swarm) Start(srv *p2p.Server) error {
startTime = time.Now()
self.tracerClose = tracing.Closer
// update uaddr to correct enode
newaddr := self.bzz.UpdateLocalAddr([]byte(srv.Self().String()))
log.Warn("Updated bzz local addr", "oaddr", fmt.Sprintf("%x", newaddr.OAddr), "uaddr", fmt.Sprintf("%s", newaddr.UAddr))
// set chequebook
if self.config.SwapEnabled {
ctx := context.Background() // The initial setup has no deadline.
err := self.SetChequebook(ctx)
if err != nil {
return fmt.Errorf("Unable to set chequebook for SWAP: %v", err)
}
log.Debug(fmt.Sprintf("-> cheque book for SWAP: %v", self.config.Swap.Chequebook()))
} else {
log.Debug(fmt.Sprintf("SWAP disabled: no cheque book set"))
}
log.Warn(fmt.Sprintf("Starting Swarm service"))
err := self.bzz.Start(srv)
if err != nil {
log.Error("bzz failed", "err", err)
return err
}
log.Info(fmt.Sprintf("Swarm network started on bzz address: %x", self.bzz.Hive.Overlay.BaseAddr()))
if self.ps != nil {
self.ps.Start(srv)
log.Info("Pss started")
}
// start swarm http proxy server
if self.config.Port != "" {
addr := net.JoinHostPort(self.config.ListenAddr, self.config.Port)
server := httpapi.NewServer(self.api, self.config.Cors)
go server.ListenAndServe(addr)
}
log.Debug(fmt.Sprintf("Swarm http proxy started on port: %v", self.config.Port))
if self.config.Cors != "" {
log.Debug(fmt.Sprintf("Swarm http proxy started with corsdomain: %v", self.config.Cors))
}
self.periodicallyUpdateGauges()
startCounter.Inc(1)
self.streamer.Start(srv)
return nil
}
func (self *Swarm) periodicallyUpdateGauges() {
ticker := time.NewTicker(updateGaugesPeriod)
go func() {
for range ticker.C {
self.updateGauges()
}
}()
}
func (self *Swarm) updateGauges() {
uptimeGauge.Update(time.Since(startTime).Nanoseconds())
requestsCacheGauge.Update(int64(self.lstore.RequestsCacheLen()))
}
// implements the node.Service interface
// stops all component services.
func (self *Swarm) Stop() error {
if self.tracerClose != nil {
err := self.tracerClose.Close()
if err != nil {
return err
}
}
if self.ps != nil {
self.ps.Stop()
}
if ch := self.config.Swap.Chequebook(); ch != nil {
ch.Stop()
ch.Save()
}
if self.lstore != nil {
self.lstore.DbStore.Close()
}
self.sfs.Stop()
stopCounter.Inc(1)
self.streamer.Stop()
return self.bzz.Stop()
}
// implements the node.Service interface
func (self *Swarm) Protocols() (protos []p2p.Protocol) {
protos = append(protos, self.bzz.Protocols()...)
if self.ps != nil {
protos = append(protos, self.ps.Protocols()...)
}
return
}
func (self *Swarm) RegisterPssProtocol(spec *protocols.Spec, targetprotocol *p2p.Protocol, options *pss.ProtocolParams) (*pss.Protocol, error) {
if !pss.IsActiveProtocol {
return nil, fmt.Errorf("Pss protocols not available (built with !nopssprotocol tag)")
}
topic := pss.ProtocolTopic(spec)
return pss.RegisterProtocol(self.ps, &topic, spec, targetprotocol, options)
}
// implements node.Service
// APIs returns the RPC API descriptors the Swarm implementation offers
func (self *Swarm) APIs() []rpc.API {
apis := []rpc.API{
// public APIs
{
Namespace: "bzz",
Version: "3.0",
Service: &Info{self.config, chequebook.ContractParams},
Public: true,
},
// admin APIs
{
Namespace: "bzz",
Version: "3.0",
Service: api.NewControl(self.api, self.bzz.Hive),
Public: false,
},
{
Namespace: "chequebook",
Version: chequebook.Version,
Service: chequebook.NewApi(self.config.Swap.Chequebook),
Public: false,
},
{
Namespace: "swarmfs",
Version: fuse.Swarmfs_Version,
Service: self.sfs,
Public: false,
},
// storage APIs
// DEPRECATED: Use the HTTP API instead
{
Namespace: "bzz",
Version: "0.1",
Service: api.NewStorage(self.api),
Public: true,
},
{
Namespace: "bzz",
Version: "0.1",
Service: api.NewFileSystem(self.api),
Public: false,
},
// {Namespace, Version, api.NewAdmin(self), false},
}
apis = append(apis, self.bzz.APIs()...)
if self.ps != nil {
apis = append(apis, self.ps.APIs()...)
}
return apis
}
func (self *Swarm) Api() *api.API {
return self.api
}
// SetChequebook ensures that the local checquebook is set up on chain.
func (self *Swarm) SetChequebook(ctx context.Context) error {
err := self.config.Swap.SetChequebook(ctx, self.backend, self.config.Path)
if err != nil {
return err
}
log.Info(fmt.Sprintf("new chequebook set (%v): saving config file, resetting all connections in the hive", self.config.Swap.Contract.Hex()))
return nil
}
// serialisable info about swarm
type Info struct {
*api.Config
*chequebook.Params
}
func (self *Info) Info() *Info {
return self
}