817 lines
28 KiB
Go
817 lines
28 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package eth
|
|
|
|
import (
|
|
"encoding/json"
|
|
"errors"
|
|
"fmt"
|
|
"math"
|
|
"math/big"
|
|
"sync"
|
|
"sync/atomic"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
"github.com/ethereum/go-ethereum/consensus"
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/eth/downloader"
|
|
"github.com/ethereum/go-ethereum/eth/fetcher"
|
|
"github.com/ethereum/go-ethereum/ethdb"
|
|
"github.com/ethereum/go-ethereum/event"
|
|
"github.com/ethereum/go-ethereum/log"
|
|
"github.com/ethereum/go-ethereum/p2p"
|
|
"github.com/ethereum/go-ethereum/p2p/enode"
|
|
"github.com/ethereum/go-ethereum/params"
|
|
"github.com/ethereum/go-ethereum/rlp"
|
|
)
|
|
|
|
const (
|
|
softResponseLimit = 2 * 1024 * 1024 // Target maximum size of returned blocks, headers or node data.
|
|
estHeaderRlpSize = 500 // Approximate size of an RLP encoded block header
|
|
|
|
// txChanSize is the size of channel listening to NewTxsEvent.
|
|
// The number is referenced from the size of tx pool.
|
|
txChanSize = 4096
|
|
|
|
// minimim number of peers to broadcast new blocks to
|
|
minBroadcastPeers = 4
|
|
)
|
|
|
|
var (
|
|
syncChallengeTimeout = 15 * time.Second // Time allowance for a node to reply to the sync progress challenge
|
|
)
|
|
|
|
// errIncompatibleConfig is returned if the requested protocols and configs are
|
|
// not compatible (low protocol version restrictions and high requirements).
|
|
var errIncompatibleConfig = errors.New("incompatible configuration")
|
|
|
|
func errResp(code errCode, format string, v ...interface{}) error {
|
|
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
|
|
}
|
|
|
|
type ProtocolManager struct {
|
|
networkID uint64
|
|
|
|
fastSync uint32 // Flag whether fast sync is enabled (gets disabled if we already have blocks)
|
|
acceptTxs uint32 // Flag whether we're considered synchronised (enables transaction processing)
|
|
|
|
checkpointNumber uint64 // Block number for the sync progress validator to cross reference
|
|
checkpointHash common.Hash // Block hash for the sync progress validator to cross reference
|
|
|
|
txpool txPool
|
|
blockchain *core.BlockChain
|
|
chainconfig *params.ChainConfig
|
|
maxPeers int
|
|
|
|
downloader *downloader.Downloader
|
|
fetcher *fetcher.Fetcher
|
|
peers *peerSet
|
|
|
|
SubProtocols []p2p.Protocol
|
|
|
|
eventMux *event.TypeMux
|
|
txsCh chan core.NewTxsEvent
|
|
txsSub event.Subscription
|
|
minedBlockSub *event.TypeMuxSubscription
|
|
|
|
whitelist map[uint64]common.Hash
|
|
|
|
// channels for fetcher, syncer, txsyncLoop
|
|
newPeerCh chan *peer
|
|
txsyncCh chan *txsync
|
|
quitSync chan struct{}
|
|
noMorePeers chan struct{}
|
|
|
|
// wait group is used for graceful shutdowns during downloading
|
|
// and processing
|
|
wg sync.WaitGroup
|
|
}
|
|
|
|
// NewProtocolManager returns a new Ethereum sub protocol manager. The Ethereum sub protocol manages peers capable
|
|
// with the Ethereum network.
|
|
func NewProtocolManager(config *params.ChainConfig, mode downloader.SyncMode, networkID uint64, mux *event.TypeMux, txpool txPool, engine consensus.Engine, blockchain *core.BlockChain, chaindb ethdb.Database, whitelist map[uint64]common.Hash) (*ProtocolManager, error) {
|
|
// Create the protocol manager with the base fields
|
|
manager := &ProtocolManager{
|
|
networkID: networkID,
|
|
eventMux: mux,
|
|
txpool: txpool,
|
|
blockchain: blockchain,
|
|
chainconfig: config,
|
|
peers: newPeerSet(),
|
|
whitelist: whitelist,
|
|
newPeerCh: make(chan *peer),
|
|
noMorePeers: make(chan struct{}),
|
|
txsyncCh: make(chan *txsync),
|
|
quitSync: make(chan struct{}),
|
|
}
|
|
// Figure out whether to allow fast sync or not
|
|
if mode == downloader.FastSync && blockchain.CurrentBlock().NumberU64() > 0 {
|
|
log.Warn("Blockchain not empty, fast sync disabled")
|
|
mode = downloader.FullSync
|
|
}
|
|
if mode == downloader.FastSync {
|
|
manager.fastSync = uint32(1)
|
|
}
|
|
// If we have trusted checkpoints, enforce them on the chain
|
|
if checkpoint, ok := params.TrustedCheckpoints[blockchain.Genesis().Hash()]; ok {
|
|
manager.checkpointNumber = (checkpoint.SectionIndex+1)*params.CHTFrequencyClient - 1
|
|
manager.checkpointHash = checkpoint.SectionHead
|
|
}
|
|
// Initiate a sub-protocol for every implemented version we can handle
|
|
manager.SubProtocols = make([]p2p.Protocol, 0, len(ProtocolVersions))
|
|
for i, version := range ProtocolVersions {
|
|
// Skip protocol version if incompatible with the mode of operation
|
|
if mode == downloader.FastSync && version < eth63 {
|
|
continue
|
|
}
|
|
// Compatible; initialise the sub-protocol
|
|
version := version // Closure for the run
|
|
manager.SubProtocols = append(manager.SubProtocols, p2p.Protocol{
|
|
Name: ProtocolName,
|
|
Version: version,
|
|
Length: ProtocolLengths[i],
|
|
Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
|
|
peer := manager.newPeer(int(version), p, rw)
|
|
select {
|
|
case manager.newPeerCh <- peer:
|
|
manager.wg.Add(1)
|
|
defer manager.wg.Done()
|
|
return manager.handle(peer)
|
|
case <-manager.quitSync:
|
|
return p2p.DiscQuitting
|
|
}
|
|
},
|
|
NodeInfo: func() interface{} {
|
|
return manager.NodeInfo()
|
|
},
|
|
PeerInfo: func(id enode.ID) interface{} {
|
|
if p := manager.peers.Peer(fmt.Sprintf("%x", id[:8])); p != nil {
|
|
return p.Info()
|
|
}
|
|
return nil
|
|
},
|
|
})
|
|
}
|
|
if len(manager.SubProtocols) == 0 {
|
|
return nil, errIncompatibleConfig
|
|
}
|
|
// Construct the different synchronisation mechanisms
|
|
manager.downloader = downloader.New(mode, manager.checkpointNumber, chaindb, manager.eventMux, blockchain, nil, manager.removePeer)
|
|
|
|
validator := func(header *types.Header) error {
|
|
return engine.VerifyHeader(blockchain, header, true)
|
|
}
|
|
heighter := func() uint64 {
|
|
return blockchain.CurrentBlock().NumberU64()
|
|
}
|
|
inserter := func(blocks types.Blocks) (int, error) {
|
|
// If fast sync is running, deny importing weird blocks
|
|
if atomic.LoadUint32(&manager.fastSync) == 1 {
|
|
log.Warn("Discarded bad propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
|
|
return 0, nil
|
|
}
|
|
atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
|
|
return manager.blockchain.InsertChain(blocks)
|
|
}
|
|
manager.fetcher = fetcher.New(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)
|
|
|
|
return manager, nil
|
|
}
|
|
|
|
func (pm *ProtocolManager) removePeer(id string) {
|
|
// Short circuit if the peer was already removed
|
|
peer := pm.peers.Peer(id)
|
|
if peer == nil {
|
|
return
|
|
}
|
|
log.Debug("Removing Ethereum peer", "peer", id)
|
|
|
|
// Unregister the peer from the downloader and Ethereum peer set
|
|
pm.downloader.UnregisterPeer(id)
|
|
if err := pm.peers.Unregister(id); err != nil {
|
|
log.Error("Peer removal failed", "peer", id, "err", err)
|
|
}
|
|
// Hard disconnect at the networking layer
|
|
if peer != nil {
|
|
peer.Peer.Disconnect(p2p.DiscUselessPeer)
|
|
}
|
|
}
|
|
|
|
func (pm *ProtocolManager) Start(maxPeers int) {
|
|
pm.maxPeers = maxPeers
|
|
|
|
// broadcast transactions
|
|
pm.txsCh = make(chan core.NewTxsEvent, txChanSize)
|
|
pm.txsSub = pm.txpool.SubscribeNewTxsEvent(pm.txsCh)
|
|
go pm.txBroadcastLoop()
|
|
|
|
// broadcast mined blocks
|
|
pm.minedBlockSub = pm.eventMux.Subscribe(core.NewMinedBlockEvent{})
|
|
go pm.minedBroadcastLoop()
|
|
|
|
// start sync handlers
|
|
go pm.syncer()
|
|
go pm.txsyncLoop()
|
|
}
|
|
|
|
func (pm *ProtocolManager) Stop() {
|
|
log.Info("Stopping Ethereum protocol")
|
|
|
|
pm.txsSub.Unsubscribe() // quits txBroadcastLoop
|
|
pm.minedBlockSub.Unsubscribe() // quits blockBroadcastLoop
|
|
|
|
// Quit the sync loop.
|
|
// After this send has completed, no new peers will be accepted.
|
|
pm.noMorePeers <- struct{}{}
|
|
|
|
// Quit fetcher, txsyncLoop.
|
|
close(pm.quitSync)
|
|
|
|
// Stop downloader and make sure that all the running downloads are complete.
|
|
pm.downloader.Terminate()
|
|
|
|
// Disconnect existing sessions.
|
|
// This also closes the gate for any new registrations on the peer set.
|
|
// sessions which are already established but not added to pm.peers yet
|
|
// will exit when they try to register.
|
|
pm.peers.Close()
|
|
|
|
// Wait for all peer handler goroutines and the loops to come down.
|
|
pm.wg.Wait()
|
|
|
|
log.Info("Ethereum protocol stopped")
|
|
}
|
|
|
|
func (pm *ProtocolManager) newPeer(pv int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
|
|
return newPeer(pv, p, newMeteredMsgWriter(rw))
|
|
}
|
|
|
|
// handle is the callback invoked to manage the life cycle of an eth peer. When
|
|
// this function terminates, the peer is disconnected.
|
|
func (pm *ProtocolManager) handle(p *peer) error {
|
|
// Ignore maxPeers if this is a trusted peer
|
|
if pm.peers.Len() >= pm.maxPeers && !p.Peer.Info().Network.Trusted {
|
|
return p2p.DiscTooManyPeers
|
|
}
|
|
p.Log().Debug("Ethereum peer connected", "name", p.Name())
|
|
|
|
// Execute the Ethereum handshake
|
|
var (
|
|
genesis = pm.blockchain.Genesis()
|
|
head = pm.blockchain.CurrentHeader()
|
|
hash = head.Hash()
|
|
number = head.Number.Uint64()
|
|
td = pm.blockchain.GetTd(hash, number)
|
|
)
|
|
if err := p.Handshake(pm.networkID, td, hash, genesis.Hash()); err != nil {
|
|
p.Log().Debug("Ethereum handshake failed", "err", err)
|
|
return err
|
|
}
|
|
if rw, ok := p.rw.(*meteredMsgReadWriter); ok {
|
|
rw.Init(p.version)
|
|
}
|
|
// Register the peer locally
|
|
if err := pm.peers.Register(p); err != nil {
|
|
p.Log().Error("Ethereum peer registration failed", "err", err)
|
|
return err
|
|
}
|
|
defer pm.removePeer(p.id)
|
|
|
|
// Register the peer in the downloader. If the downloader considers it banned, we disconnect
|
|
if err := pm.downloader.RegisterPeer(p.id, p.version, p); err != nil {
|
|
return err
|
|
}
|
|
// Propagate existing transactions. new transactions appearing
|
|
// after this will be sent via broadcasts.
|
|
pm.syncTransactions(p)
|
|
|
|
// If we have a trusted CHT, reject all peers below that (avoid fast sync eclipse)
|
|
if pm.checkpointHash != (common.Hash{}) {
|
|
// Request the peer's checkpoint header for chain height/weight validation
|
|
if err := p.RequestHeadersByNumber(pm.checkpointNumber, 1, 0, false); err != nil {
|
|
return err
|
|
}
|
|
// Start a timer to disconnect if the peer doesn't reply in time
|
|
p.syncDrop = time.AfterFunc(syncChallengeTimeout, func() {
|
|
p.Log().Warn("Checkpoint challenge timed out, dropping", "addr", p.RemoteAddr(), "type", p.Name())
|
|
pm.removePeer(p.id)
|
|
})
|
|
// Make sure it's cleaned up if the peer dies off
|
|
defer func() {
|
|
if p.syncDrop != nil {
|
|
p.syncDrop.Stop()
|
|
p.syncDrop = nil
|
|
}
|
|
}()
|
|
}
|
|
// If we have any explicit whitelist block hashes, request them
|
|
for number := range pm.whitelist {
|
|
if err := p.RequestHeadersByNumber(number, 1, 0, false); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
// Handle incoming messages until the connection is torn down
|
|
for {
|
|
if err := pm.handleMsg(p); err != nil {
|
|
p.Log().Debug("Ethereum message handling failed", "err", err)
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
// handleMsg is invoked whenever an inbound message is received from a remote
|
|
// peer. The remote connection is torn down upon returning any error.
|
|
func (pm *ProtocolManager) handleMsg(p *peer) error {
|
|
// Read the next message from the remote peer, and ensure it's fully consumed
|
|
msg, err := p.rw.ReadMsg()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if msg.Size > ProtocolMaxMsgSize {
|
|
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
|
|
}
|
|
defer msg.Discard()
|
|
|
|
// Handle the message depending on its contents
|
|
switch {
|
|
case msg.Code == StatusMsg:
|
|
// Status messages should never arrive after the handshake
|
|
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
|
|
|
|
// Block header query, collect the requested headers and reply
|
|
case msg.Code == GetBlockHeadersMsg:
|
|
// Decode the complex header query
|
|
var query getBlockHeadersData
|
|
if err := msg.Decode(&query); err != nil {
|
|
return errResp(ErrDecode, "%v: %v", msg, err)
|
|
}
|
|
hashMode := query.Origin.Hash != (common.Hash{})
|
|
first := true
|
|
maxNonCanonical := uint64(100)
|
|
|
|
// Gather headers until the fetch or network limits is reached
|
|
var (
|
|
bytes common.StorageSize
|
|
headers []*types.Header
|
|
unknown bool
|
|
)
|
|
for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit && len(headers) < downloader.MaxHeaderFetch {
|
|
// Retrieve the next header satisfying the query
|
|
var origin *types.Header
|
|
if hashMode {
|
|
if first {
|
|
first = false
|
|
origin = pm.blockchain.GetHeaderByHash(query.Origin.Hash)
|
|
if origin != nil {
|
|
query.Origin.Number = origin.Number.Uint64()
|
|
}
|
|
} else {
|
|
origin = pm.blockchain.GetHeader(query.Origin.Hash, query.Origin.Number)
|
|
}
|
|
} else {
|
|
origin = pm.blockchain.GetHeaderByNumber(query.Origin.Number)
|
|
}
|
|
if origin == nil {
|
|
break
|
|
}
|
|
headers = append(headers, origin)
|
|
bytes += estHeaderRlpSize
|
|
|
|
// Advance to the next header of the query
|
|
switch {
|
|
case hashMode && query.Reverse:
|
|
// Hash based traversal towards the genesis block
|
|
ancestor := query.Skip + 1
|
|
if ancestor == 0 {
|
|
unknown = true
|
|
} else {
|
|
query.Origin.Hash, query.Origin.Number = pm.blockchain.GetAncestor(query.Origin.Hash, query.Origin.Number, ancestor, &maxNonCanonical)
|
|
unknown = (query.Origin.Hash == common.Hash{})
|
|
}
|
|
case hashMode && !query.Reverse:
|
|
// Hash based traversal towards the leaf block
|
|
var (
|
|
current = origin.Number.Uint64()
|
|
next = current + query.Skip + 1
|
|
)
|
|
if next <= current {
|
|
infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
|
|
p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", query.Skip, "next", next, "attacker", infos)
|
|
unknown = true
|
|
} else {
|
|
if header := pm.blockchain.GetHeaderByNumber(next); header != nil {
|
|
nextHash := header.Hash()
|
|
expOldHash, _ := pm.blockchain.GetAncestor(nextHash, next, query.Skip+1, &maxNonCanonical)
|
|
if expOldHash == query.Origin.Hash {
|
|
query.Origin.Hash, query.Origin.Number = nextHash, next
|
|
} else {
|
|
unknown = true
|
|
}
|
|
} else {
|
|
unknown = true
|
|
}
|
|
}
|
|
case query.Reverse:
|
|
// Number based traversal towards the genesis block
|
|
if query.Origin.Number >= query.Skip+1 {
|
|
query.Origin.Number -= query.Skip + 1
|
|
} else {
|
|
unknown = true
|
|
}
|
|
|
|
case !query.Reverse:
|
|
// Number based traversal towards the leaf block
|
|
query.Origin.Number += query.Skip + 1
|
|
}
|
|
}
|
|
return p.SendBlockHeaders(headers)
|
|
|
|
case msg.Code == BlockHeadersMsg:
|
|
// A batch of headers arrived to one of our previous requests
|
|
var headers []*types.Header
|
|
if err := msg.Decode(&headers); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// If no headers were received, but we're expencting a checkpoint header, consider it that
|
|
if len(headers) == 0 && p.syncDrop != nil {
|
|
// Stop the timer either way, decide later to drop or not
|
|
p.syncDrop.Stop()
|
|
p.syncDrop = nil
|
|
|
|
// If we're doing a fast sync, we must enforce the checkpoint block to avoid
|
|
// eclipse attacks. Unsynced nodes are welcome to connect after we're done
|
|
// joining the network
|
|
if atomic.LoadUint32(&pm.fastSync) == 1 {
|
|
p.Log().Warn("Dropping unsynced node during fast sync", "addr", p.RemoteAddr(), "type", p.Name())
|
|
return errors.New("unsynced node cannot serve fast sync")
|
|
}
|
|
}
|
|
// Filter out any explicitly requested headers, deliver the rest to the downloader
|
|
filter := len(headers) == 1
|
|
if filter {
|
|
// If it's a potential sync progress check, validate the content and advertised chain weight
|
|
if p.syncDrop != nil && headers[0].Number.Uint64() == pm.checkpointNumber {
|
|
// Disable the sync drop timer
|
|
p.syncDrop.Stop()
|
|
p.syncDrop = nil
|
|
|
|
// Validate the header and either drop the peer or continue
|
|
if headers[0].Hash() != pm.checkpointHash {
|
|
return errors.New("checkpoint hash mismatch")
|
|
}
|
|
return nil
|
|
}
|
|
// Otherwise if it's a whitelisted block, validate against the set
|
|
if want, ok := pm.whitelist[headers[0].Number.Uint64()]; ok {
|
|
if hash := headers[0].Hash(); want != hash {
|
|
p.Log().Info("Whitelist mismatch, dropping peer", "number", headers[0].Number.Uint64(), "hash", hash, "want", want)
|
|
return errors.New("whitelist block mismatch")
|
|
}
|
|
p.Log().Debug("Whitelist block verified", "number", headers[0].Number.Uint64(), "hash", want)
|
|
}
|
|
// Irrelevant of the fork checks, send the header to the fetcher just in case
|
|
headers = pm.fetcher.FilterHeaders(p.id, headers, time.Now())
|
|
}
|
|
if len(headers) > 0 || !filter {
|
|
err := pm.downloader.DeliverHeaders(p.id, headers)
|
|
if err != nil {
|
|
log.Debug("Failed to deliver headers", "err", err)
|
|
}
|
|
}
|
|
|
|
case msg.Code == GetBlockBodiesMsg:
|
|
// Decode the retrieval message
|
|
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
|
|
if _, err := msgStream.List(); err != nil {
|
|
return err
|
|
}
|
|
// Gather blocks until the fetch or network limits is reached
|
|
var (
|
|
hash common.Hash
|
|
bytes int
|
|
bodies []rlp.RawValue
|
|
)
|
|
for bytes < softResponseLimit && len(bodies) < downloader.MaxBlockFetch {
|
|
// Retrieve the hash of the next block
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested block body, stopping if enough was found
|
|
if data := pm.blockchain.GetBodyRLP(hash); len(data) != 0 {
|
|
bodies = append(bodies, data)
|
|
bytes += len(data)
|
|
}
|
|
}
|
|
return p.SendBlockBodiesRLP(bodies)
|
|
|
|
case msg.Code == BlockBodiesMsg:
|
|
// A batch of block bodies arrived to one of our previous requests
|
|
var request blockBodiesData
|
|
if err := msg.Decode(&request); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver them all to the downloader for queuing
|
|
transactions := make([][]*types.Transaction, len(request))
|
|
uncles := make([][]*types.Header, len(request))
|
|
|
|
for i, body := range request {
|
|
transactions[i] = body.Transactions
|
|
uncles[i] = body.Uncles
|
|
}
|
|
// Filter out any explicitly requested bodies, deliver the rest to the downloader
|
|
filter := len(transactions) > 0 || len(uncles) > 0
|
|
if filter {
|
|
transactions, uncles = pm.fetcher.FilterBodies(p.id, transactions, uncles, time.Now())
|
|
}
|
|
if len(transactions) > 0 || len(uncles) > 0 || !filter {
|
|
err := pm.downloader.DeliverBodies(p.id, transactions, uncles)
|
|
if err != nil {
|
|
log.Debug("Failed to deliver bodies", "err", err)
|
|
}
|
|
}
|
|
|
|
case p.version >= eth63 && msg.Code == GetNodeDataMsg:
|
|
// Decode the retrieval message
|
|
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
|
|
if _, err := msgStream.List(); err != nil {
|
|
return err
|
|
}
|
|
// Gather state data until the fetch or network limits is reached
|
|
var (
|
|
hash common.Hash
|
|
bytes int
|
|
data [][]byte
|
|
)
|
|
for bytes < softResponseLimit && len(data) < downloader.MaxStateFetch {
|
|
// Retrieve the hash of the next state entry
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested state entry, stopping if enough was found
|
|
if entry, err := pm.blockchain.TrieNode(hash); err == nil {
|
|
data = append(data, entry)
|
|
bytes += len(entry)
|
|
}
|
|
}
|
|
return p.SendNodeData(data)
|
|
|
|
case p.version >= eth63 && msg.Code == NodeDataMsg:
|
|
// A batch of node state data arrived to one of our previous requests
|
|
var data [][]byte
|
|
if err := msg.Decode(&data); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver all to the downloader
|
|
if err := pm.downloader.DeliverNodeData(p.id, data); err != nil {
|
|
log.Debug("Failed to deliver node state data", "err", err)
|
|
}
|
|
|
|
case p.version >= eth63 && msg.Code == GetReceiptsMsg:
|
|
// Decode the retrieval message
|
|
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
|
|
if _, err := msgStream.List(); err != nil {
|
|
return err
|
|
}
|
|
// Gather state data until the fetch or network limits is reached
|
|
var (
|
|
hash common.Hash
|
|
bytes int
|
|
receipts []rlp.RawValue
|
|
)
|
|
for bytes < softResponseLimit && len(receipts) < downloader.MaxReceiptFetch {
|
|
// Retrieve the hash of the next block
|
|
if err := msgStream.Decode(&hash); err == rlp.EOL {
|
|
break
|
|
} else if err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Retrieve the requested block's receipts, skipping if unknown to us
|
|
results := pm.blockchain.GetReceiptsByHash(hash)
|
|
if results == nil {
|
|
if header := pm.blockchain.GetHeaderByHash(hash); header == nil || header.ReceiptHash != types.EmptyRootHash {
|
|
continue
|
|
}
|
|
}
|
|
// If known, encode and queue for response packet
|
|
if encoded, err := rlp.EncodeToBytes(results); err != nil {
|
|
log.Error("Failed to encode receipt", "err", err)
|
|
} else {
|
|
receipts = append(receipts, encoded)
|
|
bytes += len(encoded)
|
|
}
|
|
}
|
|
return p.SendReceiptsRLP(receipts)
|
|
|
|
case p.version >= eth63 && msg.Code == ReceiptsMsg:
|
|
// A batch of receipts arrived to one of our previous requests
|
|
var receipts [][]*types.Receipt
|
|
if err := msg.Decode(&receipts); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
// Deliver all to the downloader
|
|
if err := pm.downloader.DeliverReceipts(p.id, receipts); err != nil {
|
|
log.Debug("Failed to deliver receipts", "err", err)
|
|
}
|
|
|
|
case msg.Code == NewBlockHashesMsg:
|
|
var announces newBlockHashesData
|
|
if err := msg.Decode(&announces); err != nil {
|
|
return errResp(ErrDecode, "%v: %v", msg, err)
|
|
}
|
|
// Mark the hashes as present at the remote node
|
|
for _, block := range announces {
|
|
p.MarkBlock(block.Hash)
|
|
}
|
|
// Schedule all the unknown hashes for retrieval
|
|
unknown := make(newBlockHashesData, 0, len(announces))
|
|
for _, block := range announces {
|
|
if !pm.blockchain.HasBlock(block.Hash, block.Number) {
|
|
unknown = append(unknown, block)
|
|
}
|
|
}
|
|
for _, block := range unknown {
|
|
pm.fetcher.Notify(p.id, block.Hash, block.Number, time.Now(), p.RequestOneHeader, p.RequestBodies)
|
|
}
|
|
|
|
case msg.Code == NewBlockMsg:
|
|
// Retrieve and decode the propagated block
|
|
var request newBlockData
|
|
if err := msg.Decode(&request); err != nil {
|
|
return errResp(ErrDecode, "%v: %v", msg, err)
|
|
}
|
|
request.Block.ReceivedAt = msg.ReceivedAt
|
|
request.Block.ReceivedFrom = p
|
|
|
|
// Mark the peer as owning the block and schedule it for import
|
|
p.MarkBlock(request.Block.Hash())
|
|
pm.fetcher.Enqueue(p.id, request.Block)
|
|
|
|
// Assuming the block is importable by the peer, but possibly not yet done so,
|
|
// calculate the head hash and TD that the peer truly must have.
|
|
var (
|
|
trueHead = request.Block.ParentHash()
|
|
trueTD = new(big.Int).Sub(request.TD, request.Block.Difficulty())
|
|
)
|
|
// Update the peer's total difficulty if better than the previous
|
|
if _, td := p.Head(); trueTD.Cmp(td) > 0 {
|
|
p.SetHead(trueHead, trueTD)
|
|
|
|
// Schedule a sync if above ours. Note, this will not fire a sync for a gap of
|
|
// a single block (as the true TD is below the propagated block), however this
|
|
// scenario should easily be covered by the fetcher.
|
|
currentBlock := pm.blockchain.CurrentBlock()
|
|
if trueTD.Cmp(pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64())) > 0 {
|
|
go pm.synchronise(p)
|
|
}
|
|
}
|
|
|
|
case msg.Code == TxMsg:
|
|
// Transactions arrived, make sure we have a valid and fresh chain to handle them
|
|
if atomic.LoadUint32(&pm.acceptTxs) == 0 {
|
|
break
|
|
}
|
|
// Transactions can be processed, parse all of them and deliver to the pool
|
|
var txs []*types.Transaction
|
|
if err := msg.Decode(&txs); err != nil {
|
|
return errResp(ErrDecode, "msg %v: %v", msg, err)
|
|
}
|
|
for i, tx := range txs {
|
|
// Validate and mark the remote transaction
|
|
if tx == nil {
|
|
return errResp(ErrDecode, "transaction %d is nil", i)
|
|
}
|
|
p.MarkTransaction(tx.Hash())
|
|
}
|
|
pm.txpool.AddRemotes(txs)
|
|
|
|
default:
|
|
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// BroadcastBlock will either propagate a block to a subset of it's peers, or
|
|
// will only announce it's availability (depending what's requested).
|
|
func (pm *ProtocolManager) BroadcastBlock(block *types.Block, propagate bool) {
|
|
hash := block.Hash()
|
|
peers := pm.peers.PeersWithoutBlock(hash)
|
|
|
|
// If propagation is requested, send to a subset of the peer
|
|
if propagate {
|
|
// Calculate the TD of the block (it's not imported yet, so block.Td is not valid)
|
|
var td *big.Int
|
|
if parent := pm.blockchain.GetBlock(block.ParentHash(), block.NumberU64()-1); parent != nil {
|
|
td = new(big.Int).Add(block.Difficulty(), pm.blockchain.GetTd(block.ParentHash(), block.NumberU64()-1))
|
|
} else {
|
|
log.Error("Propagating dangling block", "number", block.Number(), "hash", hash)
|
|
return
|
|
}
|
|
// Send the block to a subset of our peers
|
|
transferLen := int(math.Sqrt(float64(len(peers))))
|
|
if transferLen < minBroadcastPeers {
|
|
transferLen = minBroadcastPeers
|
|
}
|
|
if transferLen > len(peers) {
|
|
transferLen = len(peers)
|
|
}
|
|
transfer := peers[:transferLen]
|
|
for _, peer := range transfer {
|
|
peer.AsyncSendNewBlock(block, td)
|
|
}
|
|
log.Trace("Propagated block", "hash", hash, "recipients", len(transfer), "duration", common.PrettyDuration(time.Since(block.ReceivedAt)))
|
|
return
|
|
}
|
|
// Otherwise if the block is indeed in out own chain, announce it
|
|
if pm.blockchain.HasBlock(hash, block.NumberU64()) {
|
|
for _, peer := range peers {
|
|
peer.AsyncSendNewBlockHash(block)
|
|
}
|
|
log.Trace("Announced block", "hash", hash, "recipients", len(peers), "duration", common.PrettyDuration(time.Since(block.ReceivedAt)))
|
|
}
|
|
}
|
|
|
|
// BroadcastTxs will propagate a batch of transactions to all peers which are not known to
|
|
// already have the given transaction.
|
|
func (pm *ProtocolManager) BroadcastTxs(txs types.Transactions) {
|
|
var txset = make(map[*peer]types.Transactions)
|
|
|
|
// Broadcast transactions to a batch of peers not knowing about it
|
|
for _, tx := range txs {
|
|
peers := pm.peers.PeersWithoutTx(tx.Hash())
|
|
for _, peer := range peers {
|
|
txset[peer] = append(txset[peer], tx)
|
|
}
|
|
log.Trace("Broadcast transaction", "hash", tx.Hash(), "recipients", len(peers))
|
|
}
|
|
// FIXME include this again: peers = peers[:int(math.Sqrt(float64(len(peers))))]
|
|
for peer, txs := range txset {
|
|
peer.AsyncSendTransactions(txs)
|
|
}
|
|
}
|
|
|
|
// Mined broadcast loop
|
|
func (pm *ProtocolManager) minedBroadcastLoop() {
|
|
// automatically stops if unsubscribe
|
|
for obj := range pm.minedBlockSub.Chan() {
|
|
if ev, ok := obj.Data.(core.NewMinedBlockEvent); ok {
|
|
pm.BroadcastBlock(ev.Block, true) // First propagate block to peers
|
|
pm.BroadcastBlock(ev.Block, false) // Only then announce to the rest
|
|
}
|
|
}
|
|
}
|
|
|
|
func (pm *ProtocolManager) txBroadcastLoop() {
|
|
for {
|
|
select {
|
|
case event := <-pm.txsCh:
|
|
pm.BroadcastTxs(event.Txs)
|
|
|
|
// Err() channel will be closed when unsubscribing.
|
|
case <-pm.txsSub.Err():
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
|
|
// known about the host peer.
|
|
type NodeInfo struct {
|
|
Network uint64 `json:"network"` // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
|
|
Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
|
|
Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
|
|
Config *params.ChainConfig `json:"config"` // Chain configuration for the fork rules
|
|
Head common.Hash `json:"head"` // SHA3 hash of the host's best owned block
|
|
}
|
|
|
|
// NodeInfo retrieves some protocol metadata about the running host node.
|
|
func (pm *ProtocolManager) NodeInfo() *NodeInfo {
|
|
currentBlock := pm.blockchain.CurrentBlock()
|
|
return &NodeInfo{
|
|
Network: pm.networkID,
|
|
Difficulty: pm.blockchain.GetTd(currentBlock.Hash(), currentBlock.NumberU64()),
|
|
Genesis: pm.blockchain.Genesis().Hash(),
|
|
Config: pm.blockchain.Config(),
|
|
Head: currentBlock.Hash(),
|
|
}
|
|
}
|