protocol

- new interface explicit backend components txPool, chainManager, blockPool
- added protoErrorDisconnect for blockpool callback (FIXME: handling peer disconnects)

eth/protocol.go

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