forked from cerc-io/plugeth
protocol
- new interface explicit backend components txPool, chainManager, blockPool - added protoErrorDisconnect for blockpool callback (FIXME: handling peer disconnects)
This commit is contained in:
zelig
parent
02017ed0e0
commit
c44e025898
102
eth/protocol.go
102
eth/protocol.go
@ -14,26 +14,33 @@ import (
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// ethProtocol represents the ethereum wire protocol
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// instance is running on each peer
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type ethProtocol struct {
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eth backend
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peer *p2p.Peer
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id string
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rw p2p.MsgReadWriter
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txPool txPool
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chainManager chainManager
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blockPool blockPool
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peer *p2p.Peer
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id string
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rw p2p.MsgReadWriter
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}
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// backend is the interface the ethereum protocol backend should implement
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// used as an argument to EthProtocol
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type backend interface {
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GetTransactions() (txs []*types.Transaction)
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type txPool interface {
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AddTransactions([]*types.Transaction)
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GetBlockHashes(hash []byte, amount uint32) (hashes [][]byte)
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AddBlockHashes(next func() ([]byte, bool), peerId string)
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}
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type chainManager interface {
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GetBlockHashesFromHash(hash []byte, amount uint64) (hashes [][]byte)
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GetBlock(hash []byte) (block *types.Block)
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AddBlock(block *types.Block, peerId string) (err error)
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AddPeer(td *big.Int, currentBlock []byte, peerId string, requestHashes func([]byte) error, requestBlocks func([][]byte) error, invalidBlock func(error)) (best bool)
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RemovePeer(peerId string)
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Status() (td *big.Int, currentBlock []byte, genesisBlock []byte)
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}
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type blockPool interface {
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AddBlockHashes(next func() ([]byte, bool), peerId string)
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AddBlock(block *types.Block, peerId string)
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AddPeer(td *big.Int, currentBlock []byte, peerId string, requestHashes func([]byte) error, requestBlocks func([][]byte) error, peerError func(int, string, ...interface{})) (best bool)
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RemovePeer(peerId string)
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}
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const (
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ProtocolVersion = 43
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NetworkId = 0
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@ -61,31 +68,33 @@ type newBlockMsgData struct {
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type getBlockHashesMsgData struct {
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Hash []byte
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Amount uint32
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Amount uint64
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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(eth backend) *p2p.Protocol {
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return &p2p.Protocol{
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func EthProtocol(txPool txPool, chainManager chainManager, blockPool blockPool) p2p.Protocol {
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return p2p.Protocol{
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Name: "eth",
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Version: ProtocolVersion,
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Length: ProtocolLength,
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Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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return runEthProtocol(eth, peer, rw)
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return runEthProtocol(txPool, chainManager, blockPool, peer, rw)
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},
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}
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}
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// the main loop that handles incoming messages
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// note RemovePeer in the post-disconnect hook
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func runEthProtocol(eth backend, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
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func runEthProtocol(txPool txPool, chainManager chainManager, blockPool blockPool, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
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self := ðProtocol{
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eth: eth,
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rw: rw,
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peer: peer,
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id: (string)(peer.Identity().Pubkey()),
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txPool: txPool,
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chainManager: chainManager,
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blockPool: blockPool,
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rw: rw,
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peer: peer,
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id: (string)(peer.Identity().Pubkey()),
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}
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err = self.handleStatus()
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if err == nil {
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@ -93,7 +102,7 @@ func runEthProtocol(eth backend, peer *p2p.Peer, rw p2p.MsgReadWriter) (err erro
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for {
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err = self.handle()
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if err != nil {
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self.eth.RemovePeer(self.id)
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self.blockPool.RemovePeer(self.id)
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break
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}
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}
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@ -118,29 +127,20 @@ func (self *ethProtocol) handle() error {
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case StatusMsg:
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return ProtocolError(ErrExtraStatusMsg, "")
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case GetTxMsg:
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txs := self.eth.GetTransactions()
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// TODO: rewrite using rlp flat
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txsInterface := make([]interface{}, len(txs))
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for i, tx := range txs {
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txsInterface[i] = tx.RlpData()
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}
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return self.rw.EncodeMsg(TxMsg, txsInterface...)
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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 ProtocolError(ErrDecode, "%v", err)
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}
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self.eth.AddTransactions(txs)
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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 ProtocolError(ErrDecode, "%v", err)
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}
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hashes := self.eth.GetBlockHashes(request.Hash, request.Amount)
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hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
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return self.rw.EncodeMsg(BlockHashesMsg, ethutil.ByteSliceToInterface(hashes)...)
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case BlockHashesMsg:
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@ -154,7 +154,7 @@ func (self *ethProtocol) handle() error {
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}
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return
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}
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self.eth.AddBlockHashes(iter, self.id)
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self.blockPool.AddBlockHashes(iter, self.id)
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if err != nil && err != rlp.EOL {
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return ProtocolError(ErrDecode, "%v", err)
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}
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@ -170,7 +170,7 @@ func (self *ethProtocol) handle() error {
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if i >= max {
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break
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}
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block := self.eth.GetBlock(hash)
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block := self.chainManager.GetBlock(hash)
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if block != nil {
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blocks = append(blocks, block.Value().Raw())
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}
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@ -188,9 +188,7 @@ func (self *ethProtocol) handle() error {
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return ProtocolError(ErrDecode, "%v", err)
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}
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}
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if err := self.eth.AddBlock(block, self.id); err != nil {
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return ProtocolError(ErrInvalidBlock, "%v", err)
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}
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self.blockPool.AddBlock(block, self.id)
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}
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case NewBlockMsg:
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@ -202,7 +200,7 @@ func (self *ethProtocol) handle() error {
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// to simplify backend interface adding a new block
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// uses AddPeer followed by AddHashes, AddBlock only if peer is the best peer
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// (or selected as new best peer)
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if self.eth.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.invalidBlock) {
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if self.blockPool.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect) {
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called := true
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iter := func() (hash []byte, ok bool) {
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if called {
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@ -212,10 +210,8 @@ func (self *ethProtocol) handle() error {
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return
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}
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}
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self.eth.AddBlockHashes(iter, self.id)
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if err := self.eth.AddBlock(request.Block, self.id); err != nil {
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return ProtocolError(ErrInvalidBlock, "%v", err)
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}
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self.blockPool.AddBlockHashes(iter, self.id)
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self.blockPool.AddBlock(request.Block, self.id)
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}
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default:
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@ -233,7 +229,7 @@ type statusMsgData struct {
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}
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func (self *ethProtocol) statusMsg() p2p.Msg {
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td, currentBlock, genesisBlock := self.eth.Status()
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td, currentBlock, genesisBlock := self.chainManager.Status()
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return p2p.NewMsg(StatusMsg,
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uint32(ProtocolVersion),
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@ -269,7 +265,7 @@ func (self *ethProtocol) handleStatus() error {
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return ProtocolError(ErrDecode, "%v", err)
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}
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_, _, genesisBlock := self.eth.Status()
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_, _, genesisBlock := self.chainManager.Status()
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if bytes.Compare(status.GenesisBlock, genesisBlock) != 0 {
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return ProtocolError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
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@ -285,7 +281,7 @@ func (self *ethProtocol) handleStatus() error {
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self.peer.Infof("Peer is [eth] capable (%d/%d). TD = %v ~ %x", status.ProtocolVersion, status.NetworkId, status.CurrentBlock)
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self.eth.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.invalidBlock)
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self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
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return nil
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}
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@ -300,11 +296,6 @@ func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
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return self.rw.EncodeMsg(GetBlocksMsg, ethutil.ByteSliceToInterface(hashes))
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}
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func (self *ethProtocol) invalidBlock(err error) {
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ProtocolError(ErrInvalidBlock, "%v", err)
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self.peer.Disconnect(p2p.DiscSubprotocolError)
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}
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func (self *ethProtocol) protoError(code int, format string, params ...interface{}) (err *protocolError) {
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err = ProtocolError(code, format, params...)
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if err.Fatal() {
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@ -314,3 +305,14 @@ func (self *ethProtocol) protoError(code int, format string, params ...interface
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}
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return
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}
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func (self *ethProtocol) protoErrorDisconnect(code int, format string, params ...interface{}) {
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err := ProtocolError(code, format, params...)
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if err.Fatal() {
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self.peer.Errorln(err)
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// disconnect
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} else {
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self.peer.Debugln(err)
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}
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}
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