Official Go implementation of the Ethereum protocol
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go-ethereum/eth/handler.go

934 lines
32 KiB

// 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/forkid"
"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"
all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly.
6 years ago
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
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
)
var (
syncChallengeTimeout = 15 * time.Second // Time allowance for a node to reply to the sync progress challenge
)
func errResp(code errCode, format string, v ...interface{}) error {
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
}
type ProtocolManager struct {
networkID uint64
forkFilter forkid.Filter // Fork ID filter, constant across the lifetime of the node
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
maxPeers int
downloader *downloader.Downloader
blockFetcher *fetcher.BlockFetcher
txFetcher *fetcher.TxFetcher
peers *peerSet
eventMux *event.TypeMux
txsCh chan core.NewTxsEvent
txsSub event.Subscription
minedBlockSub *event.TypeMuxSubscription
whitelist map[uint64]common.Hash
// channels for fetcher, syncer, txsyncLoop
txsyncCh chan *txsync
quitSync chan struct{}
chainSync *chainSyncer
wg sync.WaitGroup
peerWG sync.WaitGroup
// Test fields or hooks
broadcastTxAnnouncesOnly bool // Testing field, disable transaction propagation
}
// NewProtocolManager returns a new Ethereum sub protocol manager. The Ethereum sub protocol manages peers capable
// with the Ethereum network.
func NewProtocolManager(config *params.ChainConfig, checkpoint *params.TrustedCheckpoint, mode downloader.SyncMode, networkID uint64, mux *event.TypeMux, txpool txPool, engine consensus.Engine, blockchain *core.BlockChain, chaindb ethdb.Database, cacheLimit int, whitelist map[uint64]common.Hash) (*ProtocolManager, error) {
// Create the protocol manager with the base fields
manager := &ProtocolManager{
networkID: networkID,
forkFilter: forkid.NewFilter(blockchain),
eventMux: mux,
txpool: txpool,
blockchain: blockchain,
peers: newPeerSet(),
whitelist: whitelist,
txsyncCh: make(chan *txsync),
quitSync: make(chan struct{}),
}
if mode == downloader.FullSync {
// The database seems empty as the current block is the genesis. Yet the fast
// block is ahead, so fast sync was enabled for this node at a certain point.
// The scenarios where this can happen is
// * if the user manually (or via a bad block) rolled back a fast sync node
// below the sync point.
// * the last fast sync is not finished while user specifies a full sync this
// time. But we don't have any recent state for full sync.
// In these cases however it's safe to reenable fast sync.
fullBlock, fastBlock := blockchain.CurrentBlock(), blockchain.CurrentFastBlock()
if fullBlock.NumberU64() == 0 && fastBlock.NumberU64() > 0 {
manager.fastSync = uint32(1)
log.Warn("Switch sync mode from full sync to fast sync")
}
} else {
if blockchain.CurrentBlock().NumberU64() > 0 {
// Print warning log if database is not empty to run fast sync.
log.Warn("Switch sync mode from fast sync to full sync")
} else {
// If fast sync was requested and our database is empty, grant it
manager.fastSync = uint32(1)
}
}
// If we have trusted checkpoints, enforce them on the chain
if checkpoint != nil {
manager.checkpointNumber = (checkpoint.SectionIndex+1)*params.CHTFrequency - 1
manager.checkpointHash = checkpoint.SectionHead
}
// Construct the downloader (long sync) and its backing state bloom if fast
// sync is requested. The downloader is responsible for deallocating the state
// bloom when it's done.
var stateBloom *trie.SyncBloom
if atomic.LoadUint32(&manager.fastSync) == 1 {
stateBloom = trie.NewSyncBloom(uint64(cacheLimit), chaindb)
}
manager.downloader = downloader.New(manager.checkpointNumber, chaindb, stateBloom, manager.eventMux, blockchain, nil, manager.removePeer)
// Construct the fetcher (short sync)
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 sync hasn't reached the checkpoint yet, deny importing weird blocks.
//
// Ideally we would also compare the head block's timestamp and similarly reject
// the propagated block if the head is too old. Unfortunately there is a corner
// case when starting new networks, where the genesis might be ancient (0 unix)
// which would prevent full nodes from accepting it.
if manager.blockchain.CurrentBlock().NumberU64() < manager.checkpointNumber {
log.Warn("Unsynced yet, discarded propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
return 0, nil
}
// If fast sync is running, deny importing weird blocks. This is a problematic
// clause when starting up a new network, because fast-syncing miners might not
// accept each others' blocks until a restart. Unfortunately we haven't figured
// out a way yet where nodes can decide unilaterally whether the network is new
// or not. This should be fixed if we figure out a solution.
if atomic.LoadUint32(&manager.fastSync) == 1 {
log.Warn("Fast syncing, discarded propagated block", "number", blocks[0].Number(), "hash", blocks[0].Hash())
return 0, nil
}
n, err := manager.blockchain.InsertChain(blocks)
if err == nil {
atomic.StoreUint32(&manager.acceptTxs, 1) // Mark initial sync done on any fetcher import
}
return n, err
}
manager.blockFetcher = fetcher.NewBlockFetcher(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)
fetchTx := func(peer string, hashes []common.Hash) error {
p := manager.peers.Peer(peer)
if p == nil {
return errors.New("unknown peer")
}
return p.RequestTxs(hashes)
}
manager.txFetcher = fetcher.NewTxFetcher(txpool.Has, txpool.AddRemotes, fetchTx)
manager.chainSync = newChainSyncer(manager)
return manager, nil
}
func (pm *ProtocolManager) makeProtocol(version uint) p2p.Protocol {
length, ok := protocolLengths[version]
if !ok {
panic("makeProtocol for unknown version")
}
return p2p.Protocol{
Name: protocolName,
Version: version,
Length: length,
Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
return pm.runPeer(pm.newPeer(int(version), p, rw, pm.txpool.Get))
},
NodeInfo: func() interface{} {
return pm.NodeInfo()
},
PeerInfo: func(id enode.ID) interface{} {
if p := pm.peers.Peer(fmt.Sprintf("%x", id[:8])); p != nil {
return p.Info()
}
return 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)
pm.txFetcher.Drop(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.wg.Add(1)
pm.txsCh = make(chan core.NewTxsEvent, txChanSize)
pm.txsSub = pm.txpool.SubscribeNewTxsEvent(pm.txsCh)
go pm.txBroadcastLoop()
// broadcast mined blocks
pm.wg.Add(1)
pm.minedBlockSub = pm.eventMux.Subscribe(core.NewMinedBlockEvent{})
go pm.minedBroadcastLoop()
// start sync handlers
pm.wg.Add(2)
go pm.chainSync.loop()
go pm.txsyncLoop64() // TODO(karalabe): Legacy initial tx echange, drop with eth/64.
}
func (pm *ProtocolManager) Stop() {
pm.txsSub.Unsubscribe() // quits txBroadcastLoop
pm.minedBlockSub.Unsubscribe() // quits blockBroadcastLoop
// Quit chainSync and txsync64.
// After this is done, no new peers will be accepted.
close(pm.quitSync)
pm.wg.Wait()
// 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()
pm.peerWG.Wait()
log.Info("Ethereum protocol stopped")
}
func (pm *ProtocolManager) newPeer(pv int, p *p2p.Peer, rw p2p.MsgReadWriter, getPooledTx func(hash common.Hash) *types.Transaction) *peer {
return newPeer(pv, p, rw, getPooledTx)
}
func (pm *ProtocolManager) runPeer(p *peer) error {
if !pm.chainSync.handlePeerEvent(p) {
return p2p.DiscQuitting
}
pm.peerWG.Add(1)
defer pm.peerWG.Done()
return pm.handle(p)
}
// 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(), forkid.NewID(pm.blockchain), pm.forkFilter); err != nil {
p.Log().Debug("Ethereum handshake failed", "err", err)
return err
}
// 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
}
pm.chainSync.handlePeerEvent(p)
// 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.blockFetcher.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.blockFetcher.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.blockFetcher.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)
}
if hash := types.CalcUncleHash(request.Block.Uncles()); hash != request.Block.UncleHash() {
log.Warn("Propagated block has invalid uncles", "have", hash, "exp", request.Block.UncleHash())
break // TODO(karalabe): return error eventually, but wait a few releases
}
if hash := types.DeriveSha(request.Block.Transactions()); hash != request.Block.TxHash() {
log.Warn("Propagated block has invalid body", "have", hash, "exp", request.Block.TxHash())
break // TODO(karalabe): return error eventually, but wait a few releases
}
if err := request.sanityCheck(); err != nil {
return 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.blockFetcher.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)
pm.chainSync.handlePeerEvent(p)
}
case msg.Code == NewPooledTransactionHashesMsg && p.version >= eth65:
// New transaction announcement arrived, make sure we have
// a valid and fresh chain to handle them
if atomic.LoadUint32(&pm.acceptTxs) == 0 {
break
}
var hashes []common.Hash
if err := msg.Decode(&hashes); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Schedule all the unknown hashes for retrieval
for _, hash := range hashes {
p.MarkTransaction(hash)
}
pm.txFetcher.Notify(p.id, hashes)
case msg.Code == GetPooledTransactionsMsg && p.version >= eth65:
// Decode the retrieval message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
if _, err := msgStream.List(); err != nil {
return err
}
// Gather transactions until the fetch or network limits is reached
var (
hash common.Hash
bytes int
hashes []common.Hash
txs []rlp.RawValue
)
for bytes < softResponseLimit {
// 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 transaction, skipping if unknown to us
tx := pm.txpool.Get(hash)
if tx == nil {
continue
}
// If known, encode and queue for response packet
if encoded, err := rlp.EncodeToBytes(tx); err != nil {
log.Error("Failed to encode transaction", "err", err)
} else {
hashes = append(hashes, hash)
txs = append(txs, encoded)
bytes += len(encoded)
}
}
return p.SendPooledTransactionsRLP(hashes, txs)
case msg.Code == TransactionMsg || (msg.Code == PooledTransactionsMsg && p.version >= eth65):
// 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.txFetcher.Enqueue(p.id, txs, msg.Code == PooledTransactionsMsg)
default:
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
}
return nil
}
// BroadcastBlock will either propagate a block to a subset of its peers, or
// will only announce its 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
transfer := peers[:int(math.Sqrt(float64(len(peers))))]
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)))
}
}
// BroadcastTransactions will propagate a batch of transactions to all peers which are not known to
// already have the given transaction.
func (pm *ProtocolManager) BroadcastTransactions(txs types.Transactions, propagate bool) {
var (
txset = make(map[*peer][]common.Hash)
annos = make(map[*peer][]common.Hash)
)
// Broadcast transactions to a batch of peers not knowing about it
if propagate {
for _, tx := range txs {
peers := pm.peers.PeersWithoutTx(tx.Hash())
// Send the block to a subset of our peers
transfer := peers[:int(math.Sqrt(float64(len(peers))))]
for _, peer := range transfer {
txset[peer] = append(txset[peer], tx.Hash())
}
log.Trace("Broadcast transaction", "hash", tx.Hash(), "recipients", len(peers))
}
for peer, hashes := range txset {
peer.AsyncSendTransactions(hashes)
}
return
}
// Otherwise only broadcast the announcement to peers
for _, tx := range txs {
peers := pm.peers.PeersWithoutTx(tx.Hash())
for _, peer := range peers {
annos[peer] = append(annos[peer], tx.Hash())
}
}
for peer, hashes := range annos {
if peer.version >= eth65 {
peer.AsyncSendPooledTransactionHashes(hashes)
} else {
peer.AsyncSendTransactions(hashes)
}
}
}
// minedBroadcastLoop sends mined blocks to connected peers.
func (pm *ProtocolManager) minedBroadcastLoop() {
defer pm.wg.Done()
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
}
}
}
// txBroadcastLoop announces new transactions to connected peers.
func (pm *ProtocolManager) txBroadcastLoop() {
defer pm.wg.Done()
for {
select {
case event := <-pm.txsCh:
// For testing purpose only, disable propagation
if pm.broadcastTxAnnouncesOnly {
pm.BroadcastTransactions(event.Txs, false)
continue
}
pm.BroadcastTransactions(event.Txs, true) // First propagate transactions to peers
pm.BroadcastTransactions(event.Txs, false) // Only then announce to the rest
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(),
}
}