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-rw-r--r--eth/handler.go844
1 files changed, 844 insertions, 0 deletions
diff --git a/eth/handler.go b/eth/handler.go
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+++ b/eth/handler.go
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+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package 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"
+ "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
+
+ // 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
+)
+
+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
+ maxPeers int
+
+ downloader *downloader.Downloader
+ fetcher *fetcher.Fetcher
+ 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
+ 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, 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,
+ eventMux: mux,
+ txpool: txpool,
+ blockchain: blockchain,
+ peers: newPeerSet(),
+ whitelist: whitelist,
+ newPeerCh: make(chan *peer),
+ noMorePeers: make(chan struct{}),
+ 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.fetcher = fetcher.New(blockchain.GetBlockByHash, validator, manager.BroadcastBlock, heighter, inserter, manager.removePeer)
+
+ 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 {
+ peer := pm.newPeer(int(version), p, rw)
+ select {
+ case pm.newPeerCh <- peer:
+ pm.wg.Add(1)
+ defer pm.wg.Done()
+ return pm.handle(peer)
+ case <-pm.quitSync:
+ return p2p.DiscQuitting
+ }
+ },
+ 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)
+ 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)
+
+ // 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)
+ }
+ 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.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(),
+ }
+}
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