eth: began split up of peers and protocol manager
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obscuren
224
eth/handler.go
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224
eth/handler.go
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package eth
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import (
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"fmt"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/rlp"
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)
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func errResp(code errCode, format string, v ...interface{}) error {
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return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
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}
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// main entrypoint, wrappers starting a server running the eth protocol
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// use this constructor to attach the protocol ("class") to server caps
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// the Dev p2p layer then runs the protocol instance on each peer
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func EthProtocol(protocolVersion, networkId int, txPool txPool, chainManager chainManager, downloader *downloader.Downloader) p2p.Protocol {
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protocol := newProtocolManager(txPool, chainManager, downloader)
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return p2p.Protocol{
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Name: "eth",
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Version: uint(protocolVersion),
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Length: ProtocolLength,
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Run: func(p *p2p.Peer, rw p2p.MsgReadWriter) error {
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//return runEthProtocol(protocolVersion, networkId, txPool, chainManager, downloader, p, rw)
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peer := protocol.newPeer(protocolVersion, networkId, p, rw)
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err := protocol.handle(peer)
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glog.V(logger.Detail).Infof("[%s]: %v\n", peer.id, err)
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return err
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},
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}
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}
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type hashFetcherFn func(common.Hash) error
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type blockFetcherFn func([]common.Hash) error
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// extProt is an interface which is passed around so we can expose GetHashes and GetBlock without exposing it to the rest of the protocol
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// extProt is passed around to peers which require to GetHashes and GetBlocks
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type extProt struct {
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getHashes hashFetcherFn
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getBlocks blockFetcherFn
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}
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func (ep extProt) GetHashes(hash common.Hash) error { return ep.getHashes(hash) }
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func (ep extProt) GetBlock(hashes []common.Hash) error { return ep.getBlocks(hashes) }
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type EthProtocolManager struct {
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protVer, netId int
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txpool txPool
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chainman chainManager
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downloader *downloader.Downloader
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pmu sync.Mutex
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peers map[string]*peer
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}
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func newProtocolManager(txpool txPool, chainman chainManager, downloader *downloader.Downloader) *EthProtocolManager {
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return &EthProtocolManager{
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txpool: txpool,
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chainman: chainman,
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downloader: downloader,
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peers: make(map[string]*peer),
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}
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}
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func (pm *EthProtocolManager) newPeer(pv, nv int, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
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pm.pmu.Lock()
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defer pm.pmu.Unlock()
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td, current, genesis := pm.chainman.Status()
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peer := newPeer(pv, nv, genesis, current, td, p, rw)
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pm.peers[peer.id] = peer
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return peer
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}
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func (pm *EthProtocolManager) handle(p *peer) error {
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if err := p.handleStatus(); err != nil {
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return err
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}
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pm.downloader.RegisterPeer(p.id, p.td, p.currentHash, p.requestHashes, p.requestBlocks)
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defer pm.downloader.UnregisterPeer(p.id)
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// propagate existing transactions. new transactions appearing
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// after this will be sent via broadcasts.
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if err := p.sendTransactions(pm.txpool.GetTransactions()); err != nil {
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return err
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}
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// main loop. handle incoming messages.
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for {
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if err := pm.handleMsg(p); err != nil {
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return err
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}
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}
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return nil
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}
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func (self *EthProtocolManager) handleMsg(p *peer) error {
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msg, err := p.rw.ReadMsg()
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if err != nil {
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return err
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}
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if msg.Size > ProtocolMaxMsgSize {
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return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
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}
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// make sure that the payload has been fully consumed
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defer msg.Discard()
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switch msg.Code {
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case GetTxMsg: // ignore
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case StatusMsg:
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return errResp(ErrExtraStatusMsg, "uncontrolled status message")
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case TxMsg:
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// TODO: rework using lazy RLP stream
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var txs []*types.Transaction
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if err := msg.Decode(&txs); err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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for i, tx := range txs {
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if tx == nil {
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return errResp(ErrDecode, "transaction %d is nil", i)
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}
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jsonlogger.LogJson(&logger.EthTxReceived{
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TxHash: tx.Hash().Hex(),
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RemoteId: p.ID().String(),
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})
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}
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self.txpool.AddTransactions(txs)
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case GetBlockHashesMsg:
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var request getBlockHashesMsgData
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if err := msg.Decode(&request); err != nil {
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return errResp(ErrDecode, "->msg %v: %v", msg, err)
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}
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if request.Amount > maxHashes {
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request.Amount = maxHashes
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}
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hashes := self.chainman.GetBlockHashesFromHash(request.Hash, request.Amount)
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return p.sendBlockHashes(hashes)
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case BlockHashesMsg:
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msgStream := rlp.NewStream(msg.Payload)
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var hashes []common.Hash
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if err := msgStream.Decode(&hashes); err != nil {
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break
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}
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self.downloader.HashCh <- hashes
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case GetBlocksMsg:
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msgStream := rlp.NewStream(msg.Payload)
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if _, err := msgStream.List(); err != nil {
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return err
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}
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var blocks []*types.Block
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var i int
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for {
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i++
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var hash common.Hash
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err := msgStream.Decode(&hash)
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if err == rlp.EOL {
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break
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} else if err != nil {
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return errResp(ErrDecode, "msg %v: %v", msg, err)
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}
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block := self.chainman.GetBlock(hash)
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if block != nil {
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blocks = append(blocks, block)
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}
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if i == maxBlocks {
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break
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}
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}
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return p.sendBlocks(blocks)
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case BlocksMsg:
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msgStream := rlp.NewStream(msg.Payload)
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var blocks []*types.Block
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if err := msgStream.Decode(&blocks); err != nil {
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glog.V(logger.Detail).Infoln("Decode error", err)
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fmt.Println("decode error", err)
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blocks = nil
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}
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self.downloader.DeliverChunk(p.id, blocks)
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case NewBlockMsg:
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var request newBlockMsgData
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if err := msg.Decode(&request); err != nil {
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return errResp(ErrDecode, "%v: %v", msg, err)
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}
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if err := request.Block.ValidateFields(); err != nil {
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return errResp(ErrDecode, "block validation %v: %v", msg, err)
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}
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hash := request.Block.Hash()
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_, chainHead, _ := self.chainman.Status()
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jsonlogger.LogJson(&logger.EthChainReceivedNewBlock{
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BlockHash: hash.Hex(),
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BlockNumber: request.Block.Number(), // this surely must be zero
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ChainHeadHash: chainHead.Hex(),
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BlockPrevHash: request.Block.ParentHash().Hex(),
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RemoteId: p.ID().String(),
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})
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self.downloader.AddBlock(p.id, request.Block, request.TD)
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default:
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return errResp(ErrInvalidMsgCode, "%v", msg.Code)
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}
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return nil
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}
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