377 lines
10 KiB
Go
377 lines
10 KiB
Go
package eth
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import (
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"fmt"
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"math/big"
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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/errs"
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"github.com/ethereum/go-ethereum/logger"
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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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const (
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ProtocolVersion = 58
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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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maxHashes = 256
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maxBlocks = 64
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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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GetTxMsg // unused
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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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const (
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ErrMsgTooLarge = iota
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ErrDecode
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ErrInvalidMsgCode
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ErrProtocolVersionMismatch
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ErrNetworkIdMismatch
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ErrGenesisBlockMismatch
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ErrNoStatusMsg
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ErrExtraStatusMsg
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)
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var errorToString = map[int]string{
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ErrMsgTooLarge: "Message too long",
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ErrDecode: "Invalid message",
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ErrInvalidMsgCode: "Invalid message code",
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ErrProtocolVersionMismatch: "Protocol version mismatch",
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ErrNetworkIdMismatch: "NetworkId mismatch",
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ErrGenesisBlockMismatch: "Genesis block mismatch",
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ErrNoStatusMsg: "No status message",
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ErrExtraStatusMsg: "Extra status message",
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}
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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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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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errors *errs.Errors
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protocolVersion int
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networkId int
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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 txPool interface {
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AddTransactions([]*types.Transaction)
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GetTransactions() types.Transactions
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}
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type chainManager interface {
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GetBlockHashesFromHash(hash common.Hash, amount uint64) (hashes []common.Hash)
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GetBlock(hash common.Hash) (block *types.Block)
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Status() (td *big.Int, currentBlock common.Hash, genesisBlock common.Hash)
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}
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type blockPool interface {
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AddBlockHashes(next func() (common.Hash, bool), peerId string)
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AddBlock(block *types.Block, peerId string)
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AddPeer(td *big.Int, currentBlock common.Hash, peerId string, requestHashes func(common.Hash) error, requestBlocks func([]common.Hash) error, peerError func(*errs.Error)) (best bool)
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RemovePeer(peerId string)
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}
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// message structs used for RLP serialization
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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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type getBlockHashesMsgData struct {
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Hash common.Hash
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Amount uint64
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}
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type statusMsgData struct {
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ProtocolVersion uint32
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NetworkId uint32
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TD *big.Int
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CurrentBlock common.Hash
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GenesisBlock common.Hash
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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, blockPool blockPool) p2p.Protocol {
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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(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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return runEthProtocol(protocolVersion, networkId, 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(protocolVersion, networkId int, txPool txPool, chainManager chainManager, blockPool blockPool, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
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id := peer.ID()
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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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protocolVersion: protocolVersion,
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networkId: networkId,
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errors: &errs.Errors{
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Package: "ETH",
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Errors: errorToString,
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},
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id: fmt.Sprintf("%x", id[:8]),
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}
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// handshake.
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if err := self.handleStatus(); err != nil {
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return err
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}
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defer self.blockPool.RemovePeer(self.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 := p2p.Send(rw, TxMsg, 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 := self.handle(); err != nil {
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return err
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}
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}
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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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return self.protoError(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 self.protoError(ErrExtraStatusMsg, "")
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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 self.protoError(ErrDecode, "msg %v: %v", msg, err)
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}
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for _, tx := range txs {
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jsonlogger.LogJson(&logger.EthTxReceived{
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TxHash: tx.Hash().Hex(),
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RemoteId: self.peer.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 self.protoError(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.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
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return p2p.Send(self.rw, BlockHashesMsg, hashes)
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case BlockHashesMsg:
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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 i int
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iter := func() (hash common.Hash, ok bool) {
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var h common.Hash
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err := msgStream.Decode(&h)
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if err == rlp.EOL {
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return common.Hash{}, false
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} else if err != nil {
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self.protoError(ErrDecode, "msg %v: after %v hashes : %v", msg, i, err)
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return common.Hash{}, false
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}
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i++
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return hash, true
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}
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self.blockPool.AddBlockHashes(iter, self.id)
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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 self.protoError(ErrDecode, "msg %v: %v", msg, err)
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}
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block := self.chainManager.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 p2p.Send(self.rw, BlocksMsg, blocks)
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case BlocksMsg:
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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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for {
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var block types.Block
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if err := msgStream.Decode(&block); err != nil {
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if err == rlp.EOL {
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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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}
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self.blockPool.AddBlock(&block, self.id)
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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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return self.protoError(ErrDecode, "%v: %v", msg, err)
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}
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hash := request.Block.Hash()
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_, chainHead, _ := self.chainManager.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: self.peer.ID().String(),
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})
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// to simplify backend interface adding a new block
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// uses AddPeer followed by AddBlock only if peer is the best peer
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// (or selected as new best peer)
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if self.blockPool.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect) {
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self.blockPool.AddBlock(request.Block, self.id)
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}
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default:
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return self.protoError(ErrInvalidMsgCode, "%v", msg.Code)
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}
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return nil
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}
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func (self *ethProtocol) handleStatus() error {
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if err := self.sendStatus(); 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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return self.protoError(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
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}
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if msg.Size > ProtocolMaxMsgSize {
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return self.protoError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
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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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return self.protoError(ErrDecode, "msg %v: %v", msg, err)
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}
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_, _, genesisBlock := self.chainManager.Status()
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if status.GenesisBlock != genesisBlock {
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return self.protoError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
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}
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if int(status.NetworkId) != self.networkId {
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return self.protoError(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, self.networkId)
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}
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if int(status.ProtocolVersion) != self.protocolVersion {
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return self.protoError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, self.protocolVersion)
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}
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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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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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func (self *ethProtocol) requestBlockHashes(from common.Hash) error {
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self.peer.Debugf("fetching hashes (%d) %x...\n", maxHashes, from[0:4])
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return p2p.Send(self.rw, GetBlockHashesMsg, getBlockHashesMsgData{from, maxHashes})
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}
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func (self *ethProtocol) requestBlocks(hashes []common.Hash) error {
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self.peer.Debugf("fetching %v blocks", len(hashes))
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return p2p.Send(self.rw, GetBlocksMsg, hashes)
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}
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func (self *ethProtocol) protoError(code int, format string, params ...interface{}) (err *errs.Error) {
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err = self.errors.New(code, format, params...)
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err.Log(self.peer.Logger)
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return
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}
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func (self *ethProtocol) sendStatus() error {
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td, currentBlock, genesisBlock := self.chainManager.Status()
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return p2p.Send(self.rw, StatusMsg, &statusMsgData{
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ProtocolVersion: uint32(self.protocolVersion),
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NetworkId: uint32(self.networkId),
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TD: td,
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CurrentBlock: currentBlock,
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GenesisBlock: genesisBlock,
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})
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}
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func (self *ethProtocol) protoErrorDisconnect(err *errs.Error) {
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err.Log(self.peer.Logger)
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if err.Fatal() {
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self.peer.Disconnect(p2p.DiscSubprotocolError)
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}
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}
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