Official Go implementation of the Ethereum protocol
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go-ethereum/eth/protocol.go

535 lines
14 KiB

package eth
import (
"bytes"
"math"
"math/big"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rlp"
)
// ethProtocol represents the ethereum wire protocol
// instance is running on each peer
type ethProtocol struct {
txPool txPool
chainManager chainManager
blockPool blockPool
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 txPool interface {
AddTransactions([]*types.Transaction)
}
type chainManager interface {
GetBlockHashesFromHash(hash []byte, amount uint64) (hashes [][]byte)
GetBlock(hash []byte) (block *types.Block)
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
ProtocolLength = uint64(8)
ProtocolMaxMsgSize = 10 * 1024 * 1024
)
// eth protocol message codes
const (
StatusMsg = iota
GetTxMsg // unused
TxMsg
GetBlockHashesMsg
BlockHashesMsg
GetBlocksMsg
BlocksMsg
NewBlockMsg
)
// message structs used for rlp decoding
type newBlockMsgData struct {
Block *types.Block
TD *big.Int
}
type getBlockHashesMsgData struct {
Hash []byte
<<<<<<< HEAD
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(txPool txPool, chainManager chainManager, blockPool blockPool) p2p.Protocol {
return p2p.Protocol{
=======
Amount uint32
}
// 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 {
return &p2p.Protocol{
>>>>>>> initial commit for eth-p2p integration
Name: "eth",
Version: ProtocolVersion,
Length: ProtocolLength,
Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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return runEthProtocol(txPool, chainManager, blockPool, peer, rw)
=======
return runEthProtocol(eth, peer, rw)
>>>>>>> initial commit for eth-p2p integration
},
}
}
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// the main loop that handles incoming messages
// note RemovePeer in the post-disconnect hook
func runEthProtocol(txPool txPool, chainManager chainManager, blockPool blockPool, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
self := &ethProtocol{
txPool: txPool,
chainManager: chainManager,
blockPool: blockPool,
rw: rw,
peer: peer,
id: (string)(peer.Identity().Pubkey()),
=======
=======
// the main loop that handles incoming messages
// note RemovePeer in the post-disconnect hook
>>>>>>> eth protocol changes
func runEthProtocol(eth backend, peer *p2p.Peer, rw p2p.MsgReadWriter) (err error) {
self := &ethProtocol{
eth: eth,
rw: rw,
peer: peer,
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>>>>>>> initial commit for eth-p2p integration
=======
id: (string)(peer.Identity().Pubkey()),
>>>>>>> eth protocol changes
}
err = self.handleStatus()
if err == nil {
go func() {
for {
err = self.handle()
if err != nil {
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self.blockPool.RemovePeer(self.id)
=======
>>>>>>> initial commit for eth-p2p integration
=======
self.eth.RemovePeer(self.id)
>>>>>>> eth protocol changes
break
}
}
}()
}
return
}
func (self *ethProtocol) handle() error {
msg, err := self.rw.ReadMsg()
if err != nil {
return err
}
if msg.Size > ProtocolMaxMsgSize {
return ProtocolError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
}
// make sure that the payload has been fully consumed
defer msg.Discard()
switch msg.Code {
case StatusMsg:
return ProtocolError(ErrExtraStatusMsg, "")
<<<<<<< HEAD
case TxMsg:
// TODO: rework using lazy RLP stream
=======
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:
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>>>>>>> initial commit for eth-p2p integration
=======
// TODO: rework using lazy RLP stream
>>>>>>> eth protocol changes
var txs []*types.Transaction
if err := msg.Decode(&txs); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
<<<<<<< HEAD
self.txPool.AddTransactions(txs)
=======
self.eth.AddTransactions(txs)
>>>>>>> initial commit for eth-p2p integration
case GetBlockHashesMsg:
var request getBlockHashesMsgData
if err := msg.Decode(&request); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
<<<<<<< HEAD
hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
=======
hashes := self.eth.GetBlockHashes(request.Hash, request.Amount)
>>>>>>> initial commit for eth-p2p integration
return self.rw.EncodeMsg(BlockHashesMsg, ethutil.ByteSliceToInterface(hashes)...)
case BlockHashesMsg:
// TODO: redo using lazy decode , this way very inefficient on known chains
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=======
>>>>>>> eth protocol changes
msgStream := rlp.NewListStream(msg.Payload, uint64(msg.Size))
var err error
iter := func() (hash []byte, ok bool) {
hash, err = msgStream.Bytes()
if err == nil {
ok = true
<<<<<<< HEAD
}
return
}
self.blockPool.AddBlockHashes(iter, self.id)
if err != nil && err != rlp.EOL {
return ProtocolError(ErrDecode, "%v", err)
}
case GetBlocksMsg:
=======
// s := rlp.NewListStream(msg.Payload, uint64(msg.Size))
var blockHashes [][]byte
if err := msg.Decode(&blockHashes); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
fetchMore := true
for _, hash := range blockHashes {
fetchMore = self.eth.AddHash(hash, self.peer)
if !fetchMore {
break
=======
>>>>>>> eth protocol changes
}
return
}
self.eth.AddBlockHashes(iter, self.id)
if err != nil && err != rlp.EOL {
return ProtocolError(ErrDecode, "%v", err)
}
case GetBlocksMsg:
<<<<<<< HEAD
// Limit to max 300 blocks
>>>>>>> initial commit for eth-p2p integration
=======
>>>>>>> eth protocol changes
var blockHashes [][]byte
if err := msg.Decode(&blockHashes); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
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max := int(math.Min(float64(len(blockHashes)), blockHashesBatchSize))
=======
max := int(math.Min(float64(len(blockHashes)), 300.0))
>>>>>>> initial commit for eth-p2p integration
=======
max := int(math.Min(float64(len(blockHashes)), blockHashesBatchSize))
>>>>>>> eth protocol changes
var blocks []interface{}
for i, hash := range blockHashes {
if i >= max {
break
}
<<<<<<< HEAD
block := self.chainManager.GetBlock(hash)
=======
block := self.eth.GetBlock(hash)
>>>>>>> initial commit for eth-p2p integration
if block != nil {
blocks = append(blocks, block.Value().Raw())
}
}
return self.rw.EncodeMsg(BlocksMsg, blocks...)
case BlocksMsg:
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=======
>>>>>>> eth protocol changes
msgStream := rlp.NewListStream(msg.Payload, uint64(msg.Size))
for {
var block *types.Block
if err := msgStream.Decode(&block); err != nil {
if err == rlp.EOL {
break
} else {
return ProtocolError(ErrDecode, "%v", err)
<<<<<<< HEAD
}
}
self.blockPool.AddBlock(block, self.id)
=======
var blocks []*types.Block
if err := msg.Decode(&blocks); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
for _, block := range blocks {
fetchHashes, err := self.eth.AddBlock(nil, block, self.peer)
if err != nil {
return ProtocolError(ErrInvalidBlock, "%v", err)
}
if fetchHashes {
if err := self.FetchHashes(block.Hash()); err != nil {
return err
}
}
>>>>>>> initial commit for eth-p2p integration
=======
}
}
if err := self.eth.AddBlock(block, self.id); err != nil {
return ProtocolError(ErrInvalidBlock, "%v", err)
}
>>>>>>> eth protocol changes
}
case NewBlockMsg:
var request newBlockMsgData
if err := msg.Decode(&request); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
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=======
>>>>>>> eth protocol changes
hash := request.Block.Hash()
// 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)
<<<<<<< HEAD
if self.blockPool.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect) {
=======
if self.eth.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.invalidBlock) {
>>>>>>> eth protocol changes
called := true
iter := func() (hash []byte, ok bool) {
if called {
called = false
return hash, true
} else {
return
}
}
<<<<<<< HEAD
self.blockPool.AddBlockHashes(iter, self.id)
self.blockPool.AddBlock(request.Block, self.id)
=======
var fetchHashes bool
// this should reset td and offer blockpool as candidate new peer?
if fetchHashes, err = self.eth.AddBlock(request.TD, request.Block, self.peer); err != nil {
return ProtocolError(ErrInvalidBlock, "%v", err)
}
if fetchHashes {
return self.FetchHashes(request.Block.Hash())
>>>>>>> initial commit for eth-p2p integration
=======
self.eth.AddBlockHashes(iter, self.id)
if err := self.eth.AddBlock(request.Block, self.id); err != nil {
return ProtocolError(ErrInvalidBlock, "%v", err)
}
>>>>>>> eth protocol changes
}
default:
return ProtocolError(ErrInvalidMsgCode, "%v", msg.Code)
}
return nil
}
type statusMsgData struct {
ProtocolVersion uint
NetworkId uint
TD *big.Int
CurrentBlock []byte
GenesisBlock []byte
}
func (self *ethProtocol) statusMsg() p2p.Msg {
<<<<<<< HEAD
td, currentBlock, genesisBlock := self.chainManager.Status()
=======
td, currentBlock, genesisBlock := self.eth.Status()
>>>>>>> initial commit for eth-p2p integration
return p2p.NewMsg(StatusMsg,
uint32(ProtocolVersion),
uint32(NetworkId),
td,
currentBlock,
genesisBlock,
)
}
func (self *ethProtocol) handleStatus() error {
// send precanned status message
if err := self.rw.WriteMsg(self.statusMsg()); err != nil {
return err
}
// read and handle remote status
msg, err := self.rw.ReadMsg()
if err != nil {
return err
}
if msg.Code != StatusMsg {
return ProtocolError(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
}
if msg.Size > ProtocolMaxMsgSize {
return ProtocolError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
}
var status statusMsgData
if err := msg.Decode(&status); err != nil {
return ProtocolError(ErrDecode, "%v", err)
}
<<<<<<< HEAD
_, _, genesisBlock := self.chainManager.Status()
=======
_, _, genesisBlock := self.eth.Status()
>>>>>>> initial commit for eth-p2p integration
if bytes.Compare(status.GenesisBlock, genesisBlock) != 0 {
return ProtocolError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
}
if status.NetworkId != NetworkId {
return ProtocolError(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, NetworkId)
}
if ProtocolVersion != status.ProtocolVersion {
return ProtocolError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, ProtocolVersion)
}
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self.peer.Infof("Peer is [eth] capable (%d/%d). TD = %v ~ %x", status.ProtocolVersion, status.NetworkId, status.CurrentBlock)
self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
=======
logger.Infof("Peer is [eth] capable (%d/%d). TD = %v ~ %x", status.ProtocolVersion, status.NetworkId, status.CurrentBlock)
if self.eth.AddPeer(status.TD, status.CurrentBlock, self.peer) {
return self.FetchHashes(status.CurrentBlock)
}
>>>>>>> initial commit for eth-p2p integration
=======
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)
>>>>>>> eth protocol changes
return nil
}
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func (self *ethProtocol) requestBlockHashes(from []byte) error {
self.peer.Debugf("fetching hashes (%d) %x...\n", blockHashesBatchSize, from[0:4])
return self.rw.EncodeMsg(GetBlockHashesMsg, from, blockHashesBatchSize)
}
func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
self.peer.Debugf("fetching %v blocks", len(hashes))
return self.rw.EncodeMsg(GetBlocksMsg, ethutil.ByteSliceToInterface(hashes))
}
func (self *ethProtocol) protoError(code int, format string, params ...interface{}) (err *protocolError) {
err = ProtocolError(code, format, params...)
if err.Fatal() {
self.peer.Errorln(err)
} else {
self.peer.Debugln(err)
}
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)
}
}
=======
func (self *ethProtocol) FetchHashes(from []byte) error {
logger.Debugf("Fetching hashes (%d) %x...\n", blockHashesBatchSize, from[0:4])
return self.rw.EncodeMsg(GetBlockHashesMsg, from, blockHashesBatchSize)
}
>>>>>>> initial commit for eth-p2p integration
=======
func (self *ethProtocol) requestBlockHashes(from []byte) error {
self.peer.Debugf("fetching hashes (%d) %x...\n", blockHashesBatchSize, from[0:4])
return self.rw.EncodeMsg(GetBlockHashesMsg, from, blockHashesBatchSize)
}
func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
self.peer.Debugf("fetching %v blocks", len(hashes))
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() {
self.peer.Errorln(err)
} else {
self.peer.Debugln(err)
}
return
}
>>>>>>> eth protocol changes