2014-12-05 21:14:55 +00:00
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package eth
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import (
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"bytes"
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2014-12-15 16:09:06 +00:00
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"fmt"
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2015-01-05 16:10:42 +00:00
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"io"
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2014-12-05 21:14:55 +00:00
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"math/big"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/p2p"
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2014-12-09 23:55:50 +00:00
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"github.com/ethereum/go-ethereum/rlp"
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2014-12-05 21:14:55 +00:00
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)
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2014-12-15 11:34:06 +00:00
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const (
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2015-01-28 20:34:08 +00:00
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ProtocolVersion = 52
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2014-12-15 11:34:06 +00:00
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NetworkId = 0
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ProtocolLength = uint64(8)
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ProtocolMaxMsgSize = 10 * 1024 * 1024
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)
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// eth protocol message codes
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const (
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StatusMsg = iota
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2015-01-06 12:39:01 +00:00
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GetTxMsg // unused
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2014-12-15 11:34:06 +00:00
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TxMsg
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GetBlockHashesMsg
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BlockHashesMsg
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GetBlocksMsg
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BlocksMsg
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NewBlockMsg
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)
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2014-12-05 21:14:55 +00:00
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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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2014-12-14 18:04:50 +00:00
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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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2014-12-14 18:04:50 +00:00
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}
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2014-12-05 21:14:55 +00:00
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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 txPool interface {
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AddTransactions([]*types.Transaction)
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2014-12-14 18:04:50 +00:00
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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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2014-12-05 21:14:55 +00:00
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GetBlock(hash []byte) (block *types.Block)
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Status() (td *big.Int, currentBlock []byte, genesisBlock []byte)
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}
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2014-12-14 18:04:50 +00:00
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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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2014-12-05 21:14:55 +00:00
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// message structs used for rlp decoding
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type newBlockMsgData struct {
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Block *types.Block
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TD *big.Int
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}
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2015-01-09 15:44:09 +00:00
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const maxHashes = 255
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2014-12-05 21:14:55 +00:00
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type getBlockHashesMsgData struct {
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Hash []byte
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2014-12-14 18:04:50 +00:00
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Amount uint64
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2014-12-05 21:14:55 +00:00
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}
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// main entrypoint, wrappers starting a server running the eth protocol
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2014-12-09 23:55:50 +00:00
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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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2014-12-14 18:04:50 +00:00
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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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2014-12-05 21:14:55 +00:00
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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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2014-12-14 18:04:50 +00:00
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return runEthProtocol(txPool, chainManager, blockPool, peer, rw)
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2014-12-05 21:14:55 +00:00
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},
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}
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}
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2014-12-09 23:55:50 +00:00
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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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2014-12-14 18:04:50 +00:00
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func runEthProtocol(txPool txPool, chainManager chainManager, blockPool blockPool, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
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2014-12-14 18:04:50 +00:00
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self := ðProtocol{
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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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2015-01-05 16:10:42 +00:00
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id: fmt.Sprintf("%x", peer.Identity().Pubkey()[:8]),
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2014-12-05 21:14:55 +00:00
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}
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err = self.handleStatus()
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if err == nil {
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2014-12-15 16:09:06 +00:00
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for {
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err = self.handle()
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if err != nil {
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self.blockPool.RemovePeer(self.id)
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break
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2014-12-05 21:14:55 +00:00
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}
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2014-12-15 16:09:06 +00:00
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}
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2014-12-05 21:14:55 +00:00
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}
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return
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}
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func (self *ethProtocol) handle() error {
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msg, err := self.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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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
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2014-12-05 21:14:55 +00:00
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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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2015-01-06 13:02:47 +00:00
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case GetTxMsg: // ignore
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2014-12-05 21:14:55 +00:00
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case StatusMsg:
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrExtraStatusMsg, "")
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2014-12-05 21:14:55 +00:00
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2014-12-05 21:14:55 +00:00
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case TxMsg:
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2014-12-09 23:55:50 +00:00
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// TODO: rework using lazy RLP stream
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2014-12-05 21:14:55 +00:00
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var txs []*types.Transaction
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if err := msg.Decode(&txs); err != nil {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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2014-12-05 21:14:55 +00:00
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}
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2014-12-14 18:04:50 +00:00
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self.txPool.AddTransactions(txs)
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2014-12-05 21:14:55 +00:00
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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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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrDecode, "->msg %v: %v", msg, err)
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2014-12-05 21:14:55 +00:00
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}
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2015-01-09 15:44:09 +00:00
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//request.Amount = uint64(math.Min(float64(maxHashes), float64(request.Amount)))
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if request.Amount > maxHashes {
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request.Amount = maxHashes
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}
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2014-12-14 18:04:50 +00:00
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hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
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2015-01-06 10:35:09 +00:00
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return p2p.EncodeMsg(self.rw, BlockHashesMsg, ethutil.ByteSliceToInterface(hashes)...)
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2014-12-05 21:14:55 +00:00
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case BlockHashesMsg:
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// TODO: redo using lazy decode , this way very inefficient on known chains
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2015-01-05 16:10:42 +00:00
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msgStream := rlp.NewStream(msg.Payload)
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2014-12-09 23:55:50 +00:00
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var err error
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2015-01-05 16:10:42 +00:00
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var i int
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2014-12-09 23:55:50 +00:00
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iter := func() (hash []byte, ok bool) {
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hash, err = msgStream.Bytes()
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if err == nil {
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2015-01-05 16:10:42 +00:00
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i++
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2014-12-09 23:55:50 +00:00
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ok = true
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2015-01-05 16:10:42 +00:00
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} else {
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if err != io.EOF {
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self.protoError(ErrDecode, "msg %v: after %v hashes : %v", msg, i, err)
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}
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2014-12-05 21:14:55 +00:00
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}
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2014-12-09 23:55:50 +00:00
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return
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2014-12-05 21:14:55 +00:00
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}
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2015-01-05 16:10:42 +00:00
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2014-12-14 18:04:50 +00:00
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self.blockPool.AddBlockHashes(iter, self.id)
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2014-12-05 21:14:55 +00:00
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case GetBlocksMsg:
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2015-01-05 16:10:42 +00:00
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msgStream := rlp.NewStream(msg.Payload)
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2014-12-05 21:14:55 +00:00
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var blocks []interface{}
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2015-01-05 16:10:42 +00:00
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var i int
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for {
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i++
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var hash []byte
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if err := msgStream.Decode(&hash); err != nil {
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if err == io.EOF {
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break
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} else {
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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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}
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2014-12-05 21:14:55 +00:00
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}
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2014-12-14 18:04:50 +00:00
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block := self.chainManager.GetBlock(hash)
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2014-12-05 21:14:55 +00:00
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if block != nil {
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2015-01-05 16:10:42 +00:00
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blocks = append(blocks, block)
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}
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if i == blockHashesBatchSize {
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break
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2014-12-05 21:14:55 +00:00
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}
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}
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2015-01-06 10:35:09 +00:00
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return p2p.EncodeMsg(self.rw, BlocksMsg, blocks...)
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2014-12-05 21:14:55 +00:00
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case BlocksMsg:
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2015-01-05 16:10:42 +00:00
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msgStream := rlp.NewStream(msg.Payload)
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2014-12-09 23:55:50 +00:00
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for {
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2015-01-05 16:10:42 +00:00
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var block types.Block
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2014-12-09 23:55:50 +00:00
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if err := msgStream.Decode(&block); err != nil {
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2015-01-05 16:10:42 +00:00
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if err == io.EOF {
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2014-12-09 23:55:50 +00:00
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break
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} else {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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2014-12-05 21:14:55 +00:00
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}
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}
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2015-01-05 16:10:42 +00:00
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self.blockPool.AddBlock(&block, self.id)
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2014-12-05 21:14:55 +00:00
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}
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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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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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2014-12-05 21:14:55 +00:00
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}
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2014-12-09 23:55:50 +00:00
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hash := request.Block.Hash()
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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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2014-12-14 18:04:50 +00:00
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if self.blockPool.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect) {
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2014-12-14 18:04:50 +00:00
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self.blockPool.AddBlock(request.Block, self.id)
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2014-12-05 21:14:55 +00:00
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}
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default:
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrInvalidMsgCode, "%v", msg.Code)
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2014-12-05 21:14:55 +00:00
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}
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return nil
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}
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type statusMsgData struct {
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2015-01-05 16:10:42 +00:00
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ProtocolVersion uint32
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NetworkId uint32
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2014-12-05 21:14:55 +00:00
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TD *big.Int
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CurrentBlock []byte
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GenesisBlock []byte
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}
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func (self *ethProtocol) statusMsg() p2p.Msg {
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2014-12-14 18:04:50 +00:00
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td, currentBlock, genesisBlock := self.chainManager.Status()
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2014-12-05 21:14:55 +00:00
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return p2p.NewMsg(StatusMsg,
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uint32(ProtocolVersion),
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uint32(NetworkId),
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td,
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currentBlock,
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genesisBlock,
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)
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}
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func (self *ethProtocol) handleStatus() error {
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// send precanned status message
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if err := self.rw.WriteMsg(self.statusMsg()); err != nil {
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return err
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}
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// read and handle remote status
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msg, err := self.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.Code != StatusMsg {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
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2014-12-05 21:14:55 +00:00
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}
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if msg.Size > ProtocolMaxMsgSize {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
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2014-12-05 21:14:55 +00:00
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}
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var status statusMsgData
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if err := msg.Decode(&status); err != nil {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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2014-12-05 21:14:55 +00:00
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}
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2014-12-14 18:04:50 +00:00
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_, _, genesisBlock := self.chainManager.Status()
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2014-12-05 21:14:55 +00:00
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if bytes.Compare(status.GenesisBlock, genesisBlock) != 0 {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
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2014-12-05 21:14:55 +00:00
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}
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if status.NetworkId != NetworkId {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, NetworkId)
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2014-12-05 21:14:55 +00:00
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}
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if ProtocolVersion != status.ProtocolVersion {
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2015-01-05 16:10:42 +00:00
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return self.protoError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, ProtocolVersion)
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2014-12-05 21:14:55 +00:00
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}
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2014-12-15 11:34:06 +00:00
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self.peer.Infof("Peer is [eth] capable (%d/%d). TD=%v H=%x\n", status.ProtocolVersion, status.NetworkId, status.TD, status.CurrentBlock[:4])
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2014-12-09 23:55:50 +00:00
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2015-01-05 16:10:42 +00:00
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self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
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2014-12-05 21:14:55 +00:00
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return nil
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}
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2014-12-09 23:55:50 +00:00
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func (self *ethProtocol) requestBlockHashes(from []byte) error {
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self.peer.Debugf("fetching hashes (%d) %x...\n", blockHashesBatchSize, from[0:4])
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2015-01-06 10:35:09 +00:00
|
|
|
return p2p.EncodeMsg(self.rw, GetBlockHashesMsg, interface{}(from), uint64(blockHashesBatchSize))
|
2014-12-09 23:55:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
|
|
|
|
self.peer.Debugf("fetching %v blocks", len(hashes))
|
2015-01-06 10:35:09 +00:00
|
|
|
return p2p.EncodeMsg(self.rw, GetBlocksMsg, ethutil.ByteSliceToInterface(hashes)...)
|
2014-12-09 23:55:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
func (self *ethProtocol) protoError(code int, format string, params ...interface{}) (err *protocolError) {
|
|
|
|
err = ProtocolError(code, format, params...)
|
|
|
|
if err.Fatal() {
|
2015-01-05 16:10:42 +00:00
|
|
|
self.peer.Errorln("err %v", err)
|
|
|
|
// disconnect
|
2014-12-09 23:55:50 +00:00
|
|
|
} else {
|
2015-01-05 16:10:42 +00:00
|
|
|
self.peer.Debugf("fyi %v", err)
|
2014-12-09 23:55:50 +00:00
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
2014-12-14 18:04:50 +00:00
|
|
|
|
|
|
|
func (self *ethProtocol) protoErrorDisconnect(code int, format string, params ...interface{}) {
|
|
|
|
err := ProtocolError(code, format, params...)
|
|
|
|
if err.Fatal() {
|
2015-01-05 16:10:42 +00:00
|
|
|
self.peer.Errorln("err %v", err)
|
2014-12-14 18:04:50 +00:00
|
|
|
// disconnect
|
|
|
|
} else {
|
2015-01-05 16:10:42 +00:00
|
|
|
self.peer.Debugf("fyi %v", err)
|
2014-12-14 18:04:50 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
}
|