Merge branch 'ethersphere-eth.blockpool' into poc8

cmd/ethereum/flags.go

@@ -59,6 +59,8 @@ var (
 	DumpNumber      int
 	VmType          int
 	ImportChain     string
+	SHH             bool
+	Dial            bool
 )
 
 // flags specific to cli client
@@ -94,6 +96,8 @@ func Init() {
 	flag.BoolVar(&StartWebSockets, "ws", false, "start websocket server")
 	flag.BoolVar(&NonInteractive, "y", false, "non-interactive mode (say yes to confirmations)")
 	flag.BoolVar(&UseSeed, "seed", true, "seed peers")
+	flag.BoolVar(&SHH, "shh", true, "whisper protocol (on)")
+	flag.BoolVar(&Dial, "dial", true, "dial out connections (on)")
 	flag.BoolVar(&GenAddr, "genaddr", false, "create a new priv/pub key")
 	flag.StringVar(&SecretFile, "import", "", "imports the file given (hex or mnemonic formats)")
 	flag.StringVar(&ExportDir, "export", "", "exports the session keyring to files in the directory given")
@@ -105,7 +109,7 @@ func Init() {
 	flag.BoolVar(&DiffTool, "difftool", false, "creates output for diff'ing. Sets LogLevel=0")
 	flag.StringVar(&DiffType, "diff", "all", "sets the level of diff output [vm, all]. Has no effect if difftool=false")
 	flag.BoolVar(&ShowGenesis, "genesis", false, "Dump the genesis block")
-	flag.StringVar(&ImportChain, "chain", "", "Imports fiven chain")
+	flag.StringVar(&ImportChain, "chain", "", "Imports given chain")
 
 	flag.BoolVar(&Dump, "dump", false, "output the ethereum state in JSON format. Sub args [number, hash]")
 	flag.StringVar(&DumpHash, "hash", "", "specify arg in hex")

cmd/ethereum/main.go

@@ -64,10 +64,14 @@ func main() {
 		NATType:    PMPGateway,
 		PMPGateway: PMPGateway,
 		KeyRing:    KeyRing,
+		Shh:        SHH,
+		Dial:       Dial,
 	})
+
 	if err != nil {
 		clilogger.Fatalln(err)
 	}
+
 	utils.KeyTasks(ethereum.KeyManager(), KeyRing, GenAddr, SecretFile, ExportDir, NonInteractive)
 
 	if Dump {
@@ -112,13 +116,6 @@ func main() {
 		return
 	}
 
-	// better reworked as cases
-	if StartJsConsole {
-		InitJsConsole(ethereum)
-	} else if len(InputFile) > 0 {
-		ExecJsFile(ethereum, InputFile)
-	}
-
 	if StartRpc {
 		utils.StartRpc(ethereum, RpcPort)
 	}
@@ -129,6 +126,11 @@ func main() {
 
 	utils.StartEthereum(ethereum, UseSeed)
 
+	if StartJsConsole {
+		InitJsConsole(ethereum)
+	} else if len(InputFile) > 0 {
+		ExecJsFile(ethereum, InputFile)
+	}
 	// this blocks the thread
 	ethereum.WaitForShutdown()
 }

core/transaction_pool.go

@@ -7,7 +7,6 @@ import (
 	"github.com/ethereum/go-ethereum/ethutil"
 	"github.com/ethereum/go-ethereum/event"
 	"github.com/ethereum/go-ethereum/logger"
-	"gopkg.in/fatih/set.v0"
 )
 
 var txplogger = logger.NewLogger("TXP")
@@ -38,7 +37,7 @@ type TxPool struct {
 	quit chan bool
 	// The actual pool
 	//pool *list.List
-	pool *set.Set
+	txs map[string]*types.Transaction
 
 	SecondaryProcessor TxProcessor
 
@@ -49,21 +48,19 @@ type TxPool struct {
 
 func NewTxPool(eventMux *event.TypeMux) *TxPool {
 	return &TxPool{
-		pool:      set.New(),
+		txs:       make(map[string]*types.Transaction),
 		queueChan: make(chan *types.Transaction, txPoolQueueSize),
 		quit:      make(chan bool),
 		eventMux:  eventMux,
 	}
 }
 
-func (pool *TxPool) addTransaction(tx *types.Transaction) {
-	pool.pool.Add(tx)
-
-	// Broadcast the transaction to the rest of the peers
-	pool.eventMux.Post(TxPreEvent{tx})
-}
-
 func (pool *TxPool) ValidateTransaction(tx *types.Transaction) error {
+	hash := tx.Hash()
+	if pool.txs[string(hash)] != nil {
+		return fmt.Errorf("Known transaction (%x)", hash[0:4])
+	}
+
 	if len(tx.To()) != 0 && len(tx.To()) != 20 {
 		return fmt.Errorf("Invalid recipient. len = %d", len(tx.To()))
 	}
@@ -95,18 +92,17 @@ func (pool *TxPool) ValidateTransaction(tx *types.Transaction) error {
 	return nil
 }
 
-func (self *TxPool) Add(tx *types.Transaction) error {
-	hash := tx.Hash()
-	if self.pool.Has(tx) {
-		return fmt.Errorf("Known transaction (%x)", hash[0:4])
-	}
+func (self *TxPool) addTx(tx *types.Transaction) {
+	self.txs[string(tx.Hash())] = tx
+}
 
+func (self *TxPool) Add(tx *types.Transaction) error {
 	err := self.ValidateTransaction(tx)
 	if err != nil {
 		return err
 	}
 
-	self.addTransaction(tx)
+	self.addTx(tx)
 
 	var to string
 	if len(tx.To()) > 0 {
@@ -124,7 +120,7 @@ func (self *TxPool) Add(tx *types.Transaction) error {
 }
 
 func (self *TxPool) Size() int {
-	return self.pool.Size()
+	return len(self.txs)
 }
 
 func (self *TxPool) AddTransactions(txs []*types.Transaction) {
@@ -137,43 +133,39 @@ func (self *TxPool) AddTransactions(txs []*types.Transaction) {
 	}
 }
 
-func (pool *TxPool) GetTransactions() []*types.Transaction {
-	txList := make([]*types.Transaction, pool.Size())
+func (self *TxPool) GetTransactions() (txs types.Transactions) {
+	txs = make(types.Transactions, self.Size())
 	i := 0
-	pool.pool.Each(func(v interface{}) bool {
-		txList[i] = v.(*types.Transaction)
+	for _, tx := range self.txs {
+		txs[i] = tx
 		i++
+	}
 
-		return true
-	})
-
-	return txList
+	return
 }
 
 func (pool *TxPool) RemoveInvalid(query StateQuery) {
 	var removedTxs types.Transactions
-	pool.pool.Each(func(v interface{}) bool {
-		tx := v.(*types.Transaction)
+	for _, tx := range pool.txs {
 		sender := query.GetAccount(tx.From())
 		err := pool.ValidateTransaction(tx)
 		if err != nil || sender.Nonce >= tx.Nonce() {
 			removedTxs = append(removedTxs, tx)
 		}
+	}
 
-		return true
-	})
 	pool.RemoveSet(removedTxs)
 }
 
 func (self *TxPool) RemoveSet(txs types.Transactions) {
 	for _, tx := range txs {
-		self.pool.Remove(tx)
+		delete(self.txs, string(tx.Hash()))
 	}
 }
 
 func (pool *TxPool) Flush() []*types.Transaction {
 	txList := pool.GetTransactions()
-	pool.pool.Clear()
+	pool.txs = make(map[string]*types.Transaction)
 
 	return txList
 }

core/types/block.go

@@ -67,10 +67,13 @@ func (self *Header) HashNoNonce() []byte {
 }
 
 type Block struct {
-	header       *Header
-	uncles       []*Header
-	transactions Transactions
-	Td           *big.Int
+	// Preset Hash for mock
+	HeaderHash       []byte
+	ParentHeaderHash []byte
+	header           *Header
+	uncles           []*Header
+	transactions     Transactions
+	Td               *big.Int
 
 	receipts Receipts
 	Reward   *big.Int
@@ -99,41 +102,19 @@ func NewBlockWithHeader(header *Header) *Block {
 }
 
 func (self *Block) DecodeRLP(s *rlp.Stream) error {
-	if _, err := s.List(); err != nil {
-		return err
-	}
-
-	var header Header
-	if err := s.Decode(&header); err != nil {
-		return err
-	}
-
-	var transactions []*Transaction
-	if err := s.Decode(&transactions); err != nil {
-		return err
+	var extblock struct {
+		Header *Header
+		Txs    []*Transaction
+		Uncles []*Header
+		TD     *big.Int // optional
 	}
-
-	var uncleHeaders []*Header
-	if err := s.Decode(&uncleHeaders); err != nil {
-		return err
-	}
-
-	var tdBytes []byte
-	if err := s.Decode(&tdBytes); err != nil {
-		// If this block comes from the network that's fine. If loaded from disk it should be there
-		// Blocks don't store their Td when propagated over the network
-	} else {
-		self.Td = ethutil.BigD(tdBytes)
-	}
-
-	if err := s.ListEnd(); err != nil {
+	if err := s.Decode(&extblock); err != nil {
 		return err
 	}
-
-	self.header = &header
-	self.uncles = uncleHeaders
-	self.transactions = transactions
-
+	self.header = extblock.Header
+	self.uncles = extblock.Uncles
+	self.transactions = extblock.Txs
+	self.Td = extblock.TD
 	return nil
 }
 
@@ -189,23 +170,35 @@ func (self *Block) RlpDataForStorage() interface{} {
 // Header accessors (add as you need them)
 func (self *Block) Number() *big.Int          { return self.header.Number }
 func (self *Block) NumberU64() uint64         { return self.header.Number.Uint64() }
-func (self *Block) ParentHash() []byte        { return self.header.ParentHash }
 func (self *Block) Bloom() []byte             { return self.header.Bloom }
 func (self *Block) Coinbase() []byte          { return self.header.Coinbase }
 func (self *Block) Time() int64               { return int64(self.header.Time) }
 func (self *Block) GasLimit() *big.Int        { return self.header.GasLimit }
 func (self *Block) GasUsed() *big.Int         { return self.header.GasUsed }
-func (self *Block) Hash() []byte              { return self.header.Hash() }
 func (self *Block) Trie() *ptrie.Trie         { return ptrie.New(self.header.Root, ethutil.Config.Db) }
+func (self *Block) SetRoot(root []byte)       { self.header.Root = root }
 func (self *Block) State() *state.StateDB     { return state.New(self.Trie()) }
 func (self *Block) Size() ethutil.StorageSize { return ethutil.StorageSize(len(ethutil.Encode(self))) }
-func (self *Block) SetRoot(root []byte)       { self.header.Root = root }
 
-// Implement block.Pow
+// Implement pow.Block
 func (self *Block) Difficulty() *big.Int { return self.header.Difficulty }
 func (self *Block) N() []byte            { return self.header.Nonce }
-func (self *Block) HashNoNonce() []byte {
-	return crypto.Sha3(ethutil.Encode(self.header.rlpData(false)))
+func (self *Block) HashNoNonce() []byte  { return self.header.HashNoNonce() }
+
+func (self *Block) Hash() []byte {
+	if self.HeaderHash != nil {
+		return self.HeaderHash
+	} else {
+		return self.header.Hash()
+	}
+}
+
+func (self *Block) ParentHash() []byte {
+	if self.ParentHeaderHash != nil {
+		return self.ParentHeaderHash
+	} else {
+		return self.header.ParentHash
+	}
 }
 
 func (self *Block) String() string {

eth/backend.go

@@ -36,6 +36,9 @@ type Config struct {
 	NATType    string
 	PMPGateway string
 
+	Shh  bool
+	Dial bool
+
 	KeyManager *crypto.KeyManager
 }
 
@@ -130,11 +133,13 @@ func New(config *Config) (*Ethereum, error) {
 	insertChain := eth.chainManager.InsertChain
 	eth.blockPool = NewBlockPool(hasBlock, insertChain, ezp.Verify)
 
-	// Start services
-	eth.txPool.Start()
-
 	ethProto := EthProtocol(eth.txPool, eth.chainManager, eth.blockPool)
-	protocols := []p2p.Protocol{ethProto, eth.whisper.Protocol()}
+	protocols := []p2p.Protocol{ethProto}
+
+	if config.Shh {
+		eth.whisper = whisper.New()
+		protocols = append(protocols, eth.whisper.Protocol())
+	}
 
 	nat, err := p2p.ParseNAT(config.NATType, config.PMPGateway)
 	if err != nil {
@@ -142,12 +147,16 @@ func New(config *Config) (*Ethereum, error) {
 	}
 
 	eth.net = &p2p.Server{
-		Identity:   clientId,
-		MaxPeers:   config.MaxPeers,
-		Protocols:  protocols,
-		ListenAddr: ":" + config.Port,
-		Blacklist:  eth.blacklist,
-		NAT:        nat,
+		Identity:  clientId,
+		MaxPeers:  config.MaxPeers,
+		Protocols: protocols,
+		Blacklist: eth.blacklist,
+		NAT:       nat,
+		NoDial:    !config.Dial,
+	}
+
+	if len(config.Port) > 0 {
+		eth.net.ListenAddr = ":" + config.Port
 	}
 
 	return eth, nil
@@ -219,8 +228,14 @@ func (s *Ethereum) Start(seed bool) error {
 	if err != nil {
 		return err
 	}
+
+	// Start services
+	s.txPool.Start()
 	s.blockPool.Start()
-	s.whisper.Start()
+
+	if s.whisper != nil {
+		s.whisper.Start()
+	}
 
 	// broadcast transactions
 	s.txSub = s.eventMux.Subscribe(core.TxPreEvent{})
@@ -268,7 +283,9 @@ func (s *Ethereum) Stop() {
 	s.txPool.Stop()
 	s.eventMux.Stop()
 	s.blockPool.Stop()
-	s.whisper.Stop()
+	if s.whisper != nil {
+		s.whisper.Stop()
+	}
 
 	logger.Infoln("Server stopped")
 	close(s.shutdownChan)
@@ -285,16 +302,16 @@ func (self *Ethereum) txBroadcastLoop() {
 	// automatically stops if unsubscribe
 	for obj := range self.txSub.Chan() {
 		event := obj.(core.TxPreEvent)
-		self.net.Broadcast("eth", TxMsg, []interface{}{event.Tx.RlpData()})
+		self.net.Broadcast("eth", TxMsg, event.Tx.RlpData())
 	}
 }
 
 func (self *Ethereum) blockBroadcastLoop() {
 	// automatically stops if unsubscribe
-	for obj := range self.txSub.Chan() {
+	for obj := range self.blockSub.Chan() {
 		switch ev := obj.(type) {
 		case core.NewMinedBlockEvent:
-			self.net.Broadcast("eth", NewBlockMsg, ev.Block.RlpData())
+			self.net.Broadcast("eth", NewBlockMsg, ev.Block.RlpData(), ev.Block.Td)
 		}
 	}
 }

eth/error.go

@@ -52,18 +52,17 @@ func ProtocolError(code int, format string, params ...interface{}) (err *protoco
 }
 
 func (self protocolError) Error() (message string) {
-	message = self.message
-	if message == "" {
-		message, ok := errorToString[self.Code]
+	if len(message) == 0 {
+		var ok bool
+		self.message, ok = errorToString[self.Code]
 		if !ok {
 			panic("invalid error code")
 		}
 		if self.format != "" {
-			message += ": " + fmt.Sprintf(self.format, self.params...)
+			self.message += ": " + fmt.Sprintf(self.format, self.params...)
 		}
-		self.message = message
 	}
-	return
+	return self.message
 }
 
 func (self *protocolError) Fatal() bool {

eth/protocol.go

@@ -3,7 +3,7 @@ package eth
 import (
 	"bytes"
 	"fmt"
-	"math"
+	"io"
 	"math/big"
 
 	"github.com/ethereum/go-ethereum/core/types"
@@ -95,14 +95,13 @@ func runEthProtocol(txPool txPool, chainManager chainManager, blockPool blockPoo
 		blockPool:    blockPool,
 		rw:           rw,
 		peer:         peer,
-		id:           (string)(peer.Identity().Pubkey()),
+		id:           fmt.Sprintf("%x", peer.Identity().Pubkey()[:8]),
 	}
 	err = self.handleStatus()
 	if err == nil {
 		for {
 			err = self.handle()
 			if err != nil {
-				fmt.Println(err)
 				self.blockPool.RemovePeer(self.id)
 				break
 			}
@@ -117,7 +116,7 @@ func (self *ethProtocol) handle() error {
 		return err
 	}
 	if msg.Size > ProtocolMaxMsgSize {
-		return ProtocolError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
+		return self.protoError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
 	}
 	// make sure that the payload has been fully consumed
 	defer msg.Discard()
@@ -125,76 +124,87 @@ func (self *ethProtocol) handle() error {
 	switch msg.Code {
 
 	case StatusMsg:
-		return ProtocolError(ErrExtraStatusMsg, "")
+		return self.protoError(ErrExtraStatusMsg, "")
 
 	case TxMsg:
 		// TODO: rework using lazy RLP stream
 		var txs []*types.Transaction
 		if err := msg.Decode(&txs); err != nil {
-			return ProtocolError(ErrDecode, "%v", err)
+			return self.protoError(ErrDecode, "msg %v: %v", msg, err)
 		}
 		self.txPool.AddTransactions(txs)
 
 	case GetBlockHashesMsg:
 		var request getBlockHashesMsgData
 		if err := msg.Decode(&request); err != nil {
-			return ProtocolError(ErrDecode, "%v", err)
+			return self.protoError(ErrDecode, "->msg %v: %v", msg, err)
 		}
 		hashes := self.chainManager.GetBlockHashesFromHash(request.Hash, request.Amount)
 		return self.rw.EncodeMsg(BlockHashesMsg, ethutil.ByteSliceToInterface(hashes)...)
 
 	case BlockHashesMsg:
 		// TODO: redo using lazy decode , this way very inefficient on known chains
-		msgStream := rlp.NewListStream(msg.Payload, uint64(msg.Size))
+		msgStream := rlp.NewStream(msg.Payload)
 		var err error
+		var i int
+
 		iter := func() (hash []byte, ok bool) {
 			hash, err = msgStream.Bytes()
 			if err == nil {
+				i++
 				ok = true
+			} else {
+				if err != io.EOF {
+					self.protoError(ErrDecode, "msg %v: after %v hashes : %v", msg, i, err)
+				}
 			}
 			return
 		}
+
 		self.blockPool.AddBlockHashes(iter, self.id)
-		if err != nil && err != rlp.EOL {
-			return ProtocolError(ErrDecode, "%v", err)
-		}
 
 	case GetBlocksMsg:
-		var blockHashes [][]byte
-		if err := msg.Decode(&blockHashes); err != nil {
-			return ProtocolError(ErrDecode, "%v", err)
-		}
-		max := int(math.Min(float64(len(blockHashes)), blockHashesBatchSize))
+		msgStream := rlp.NewStream(msg.Payload)
 		var blocks []interface{}
-		for i, hash := range blockHashes {
-			if i >= max {
-				break
+		var i int
+		for {
+			i++
+			var hash []byte
+			if err := msgStream.Decode(&hash); err != nil {
+				if err == io.EOF {
+					break
+				} else {
+					return self.protoError(ErrDecode, "msg %v: %v", msg, err)
+				}
 			}
 			block := self.chainManager.GetBlock(hash)
 			if block != nil {
-				blocks = append(blocks, block.RlpData())
+				blocks = append(blocks, block)
+			}
+			if i == blockHashesBatchSize {
+				break
 			}
 		}
 		return self.rw.EncodeMsg(BlocksMsg, blocks...)
 
 	case BlocksMsg:
-		msgStream := rlp.NewListStream(msg.Payload, uint64(msg.Size))
+		msgStream := rlp.NewStream(msg.Payload)
 		for {
-			var block *types.Block
+			var block types.Block
 			if err := msgStream.Decode(&block); err != nil {
-				if err == rlp.EOL {
+				if err == io.EOF {
 					break
 				} else {
-					return ProtocolError(ErrDecode, "%v", err)
+					return self.protoError(ErrDecode, "msg %v: %v", msg, err)
 				}
 			}
-			self.blockPool.AddBlock(block, self.id)
+			self.blockPool.AddBlock(&block, self.id)
 		}
 
 	case NewBlockMsg:
 		var request newBlockMsgData
 		if err := msg.Decode(&request); err != nil {
-			return ProtocolError(ErrDecode, "%v", err)
+			return self.protoError(ErrDecode, "msg %v: %v", msg, err)
 		}
 		hash := request.Block.Hash()
 		// to simplify backend interface adding a new block
@@ -202,12 +212,12 @@ func (self *ethProtocol) handle() error {
 		// (or selected as new best peer)
 		if self.blockPool.AddPeer(request.TD, hash, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect) {
 			called := true
-			iter := func() (hash []byte, ok bool) {
+			iter := func() ([]byte, bool) {
 				if called {
 					called = false
 					return hash, true
 				} else {
-					return
+					return nil, false
 				}
 			}
 			self.blockPool.AddBlockHashes(iter, self.id)
@@ -215,14 +225,14 @@ func (self *ethProtocol) handle() error {
 		}
 
 	default:
-		return ProtocolError(ErrInvalidMsgCode, "%v", msg.Code)
+		return self.protoError(ErrInvalidMsgCode, "%v", msg.Code)
 	}
 	return nil
 }
 
 type statusMsgData struct {
-	ProtocolVersion uint
-	NetworkId       uint
+	ProtocolVersion uint32
+	NetworkId       uint32
 	TD              *big.Int
 	CurrentBlock    []byte
 	GenesisBlock    []byte
@@ -253,56 +263,56 @@ func (self *ethProtocol) handleStatus() error {
 	}
 
 	if msg.Code != StatusMsg {
-		return ProtocolError(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
+		return self.protoError(ErrNoStatusMsg, "first msg has code %x (!= %x)", msg.Code, StatusMsg)
 	}
 
 	if msg.Size > ProtocolMaxMsgSize {
-		return ProtocolError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
+		return self.protoError(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
 	}
 
 	var status statusMsgData
 	if err := msg.Decode(&status); err != nil {
-		return ProtocolError(ErrDecode, "%v", err)
+		return self.protoError(ErrDecode, "msg %v: %v", msg, err)
 	}
 
 	_, _, genesisBlock := self.chainManager.Status()
 
 	if bytes.Compare(status.GenesisBlock, genesisBlock) != 0 {
-		return ProtocolError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
+		return self.protoError(ErrGenesisBlockMismatch, "%x (!= %x)", status.GenesisBlock, genesisBlock)
 	}
 
 	if status.NetworkId != NetworkId {
-		return ProtocolError(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, NetworkId)
+		return self.protoError(ErrNetworkIdMismatch, "%d (!= %d)", status.NetworkId, NetworkId)
 	}
 
 	if ProtocolVersion != status.ProtocolVersion {
-		return ProtocolError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, ProtocolVersion)
+		return self.protoError(ErrProtocolVersionMismatch, "%d (!= %d)", status.ProtocolVersion, ProtocolVersion)
 	}
 
 	self.peer.Infof("Peer is [eth] capable (%d/%d). TD=%v H=%x\n", status.ProtocolVersion, status.NetworkId, status.TD, status.CurrentBlock[:4])
 
-	//self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
-	self.peer.Infoln("AddPeer(IGNORED)")
+	self.blockPool.AddPeer(status.TD, status.CurrentBlock, self.id, self.requestBlockHashes, self.requestBlocks, self.protoErrorDisconnect)
 
 	return nil
 }
 
 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)
+	return self.rw.EncodeMsg(GetBlockHashesMsg, interface{}(from), uint64(blockHashesBatchSize))
 }
 
 func (self *ethProtocol) requestBlocks(hashes [][]byte) error {
 	self.peer.Debugf("fetching %v blocks", len(hashes))
-	return self.rw.EncodeMsg(GetBlocksMsg, ethutil.ByteSliceToInterface(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)
+		self.peer.Errorln("err %v", err)
+		// disconnect
 	} else {
-		self.peer.Debugln(err)
+		self.peer.Debugf("fyi %v", err)
 	}
 	return
 }
@@ -310,10 +320,10 @@ func (self *ethProtocol) protoError(code int, format string, params ...interface
 func (self *ethProtocol) protoErrorDisconnect(code int, format string, params ...interface{}) {
 	err := ProtocolError(code, format, params...)
 	if err.Fatal() {
-		self.peer.Errorln(err)
+		self.peer.Errorln("err %v", err)
 		// disconnect
 	} else {
-		self.peer.Debugln(err)
+		self.peer.Debugf("fyi %v", err)
 	}
 
 }

eth/test/README.md

+= Integration tests for eth protocol and blockpool 
+
+This is a simple suite of tests to fire up a local test node with peers to test blockchain synchronisation and download. 
+The scripts call ethereum (assumed to be compiled in go-ethereum root). 
+
+To run a test:
+
+    . run.sh 00 02
+
+Without arguments, all tests are run. 
+
+Peers are launched with preloaded imported chains. In order to prevent them from synchronizing with each other they are set with `-dial=false` and `-maxpeer 1` options. They log into `/tmp/eth.test/nodes/XX` where XX is the last two digits of their port. 
+
+Chains to import can be bootstrapped by letting nodes mine for some time. This is done with 
+
+    . bootstrap.sh 
+
+Only the relative timing and forks matter so they should work if the bootstrap script is rerun. 
+The reference blockchain of tests are soft links to these import chains and check at the end of a test run. 
+
+Connecting to peers and exporting blockchain is scripted with JS files executed by the JSRE, see `tests/XX.sh`. 
+
+Each test is set with a timeout. This may vary on different computers so adjust sensibly. 
+If you kill a test before it completes, do not forget to kill all the background processes, since they will impact the result. Use:
+
+    killall ethereum
+

eth/test/bootstrap.sh

+#!/bin/bash
+# bootstrap chains - used to regenerate tests/chains/*.chain
+
+mkdir -p chains
+bash ./mine.sh 00 10
+bash ./mine.sh 01 5 00
+bash ./mine.sh 02 10 00
+bash ./mine.sh 03 5 02
+bash ./mine.sh 04 10 02
\ No newline at end of file

eth/test/mine.sh

+#!/bin/bash
+# bash ./mine.sh node_id timeout(sec) [basechain]
+ETH=../../ethereum
+MINE="$ETH -datadir tmp/nodes/$1 -seed=false -port '' -shh=false -id test$1"
+rm -rf tmp/nodes/$1
+echo "Creating chain $1..."
+if [[ "" !=  "$3" ]]; then
+  CHAIN="chains/$3.chain"
+  CHAINARG="-chain $CHAIN"
+  $MINE -mine $CHAINARG -loglevel 3 | grep 'importing'
+fi
+$MINE -mine -loglevel 0 &
+PID=$!
+sleep $2
+kill $PID
+$MINE -loglevel 3 <(echo "eth.export(\"chains/$1.chain\")") > /tmp/eth.test/mine.tmp &
+PID=$!
+sleep 1
+kill $PID
+cat /tmp/eth.test/mine.tmp | grep 'exporting'

eth/test/run.sh

+#!/bin/bash
+# bash run.sh (testid0 testid1 ...)
+# runs tests tests/testid0.sh tests/testid1.sh ...
+# without arguments, it runs all tests
+
+. tests/common.sh
+
+TESTS=
+
+if [ "$#" -eq 0 ]; then
+  for NAME in tests/??.sh; do
+    i=`basename $NAME .sh`
+    TESTS="$TESTS $i"
+  done
+else
+  TESTS=$@
+fi
+
+ETH=../../ethereum
+DIR="/tmp/eth.test/nodes"
+TIMEOUT=10
+
+mkdir -p $DIR/js
+
+echo "running tests $TESTS"
+for NAME in $TESTS; do
+  PIDS=
+  CHAIN="tests/$NAME.chain"
+  JSFILE="$DIR/js/$NAME.js"
+  CHAIN_TEST="$DIR/$NAME/chain"
+
+  echo "RUN: test $NAME"
+  cat tests/common.js > $JSFILE
+  . tests/$NAME.sh
+  sleep $TIMEOUT
+  echo "timeout after $TIMEOUT seconds: killing $PIDS"
+  kill $PIDS
+  if [ -r "$CHAIN" ]; then
+    if diff $CHAIN $CHAIN_TEST >/dev/null ; then
+      echo "chain ok: $CHAIN=$CHAIN_TEST"
+    else
+      echo "FAIL: chains differ: expected $CHAIN ; got $CHAIN_TEST"
+      continue
+    fi
+  fi
+  ERRORS=$DIR/errors
+  if [ -r "$ERRORS" ]; then
+    echo "FAIL: "
+    cat $ERRORS
+  else
+    echo PASS
+  fi
+done
\ No newline at end of file

eth/test/tests/00.chain

+../chains/01.chain
\ No newline at end of file

eth/test/tests/00.sh

+#!/bin/bash
+
+TIMEOUT=4
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+sleep(1000)
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 01
+test_node $NAME "" -loglevel 5 $JSFILE
+

eth/test/tests/01.chain

+../chains/02.chain
\ No newline at end of file

eth/test/tests/01.sh

+#!/bin/bash
+
+TIMEOUT=5
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+log("added peer localhost:30311");
+sleep(1000);
+log("added peer localhost:30312");
+eth.addPeer("localhost:30312");
+sleep(3000);
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 01
+peer 12 02
+test_node $NAME "" -loglevel 5 $JSFILE
+

eth/test/tests/02.chain

+../chains/01.chain
\ No newline at end of file

eth/test/tests/02.sh

+#!/bin/bash
+
+TIMEOUT=6
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+sleep(200);
+eth.addPeer("localhost:30312");
+sleep(3000);
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 01
+peer 12 02
+P13ID=$PID
+test_node $NAME "" -loglevel 5 $JSFILE
+sleep 0.5
+kill $P13ID
+

eth/test/tests/03.chain

+../chains/12k.chain
\ No newline at end of file

eth/test/tests/03.sh

+#!/bin/bash
+
+TIMEOUT=35
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+sleep(30000);
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 12k
+sleep 2
+test_node $NAME "" -loglevel 5 $JSFILE
+

eth/test/tests/04.sh

+#!/bin/bash
+
+TIMEOUT=15
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+sleep(200);
+eth.addPeer("localhost:30312");
+sleep(13000);
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 01 -mine
+peer 12 02
+test_node $NAME "" -loglevel 5 $JSFILE
+sleep 6
+cat $DIR/$NAME/debug.log | grep 'best peer'

eth/test/tests/05.sh

+#!/bin/bash
+
+TIMEOUT=60
+
+cat >> $JSFILE <<EOF
+eth.addPeer("localhost:30311");
+sleep(200);
+eth.addPeer("localhost:30312");
+eth.addPeer("localhost:30313");
+eth.addPeer("localhost:30314");
+sleep(3000);
+eth.export("$CHAIN_TEST");
+EOF
+
+peer 11 01 -mine
+peer 12 02 -mine
+peer 13 03
+peer 14 04
+test_node $NAME "" -loglevel 5 $JSFILE
+

eth/test/tests/common.js

+function log(text) {
+  console.log("[JS TEST SCRIPT] " + text);
+}
+
+function sleep(seconds) {
+    var now = new Date().getTime();
+    while(new Date().getTime() < now + seconds){}
+}
+

eth/test/tests/common.sh

+#!/bin/bash
+
+# launched by run.sh
+function test_node {
+  rm -rf $DIR/$1
+  ARGS="-datadir $DIR/$1 -debug debug -seed=false -shh=false -id test$1"
+  if [ "" != "$2" ]; then
+    chain="chains/$2.chain"
+    echo "import chain $chain"
+    $ETH $ARGS -loglevel 3 -chain $chain | grep CLI |grep import
+  fi
+  echo "starting test node $1 with extra args ${@:3}"
+  $ETH $ARGS -port 303$1 ${@:3} &
+  PID=$!
+  PIDS="$PIDS $PID"
+}
+
+function peer {
+  test_node $@ -loglevel 5 -logfile debug.log -maxpeer 1 -dial=false
+}
\ No newline at end of file

p2p/client_identity_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestClientIdentity(t *testing.T) {
-	clientIdentity := NewSimpleClientIdentity("Ethereum(G)", "0.5.16", "test", "pubkey")
+	clientIdentity := NewSimpleClientIdentity("Ethereum(G)", "0.5.16", "test", []byte("pubkey"))
 	clientString := clientIdentity.String()
 	expected := fmt.Sprintf("Ethereum(G)/v0.5.16/test/%s/%s", runtime.GOOS, runtime.Version())
 	if clientString != expected {

p2p/message.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"io"
 	"io/ioutil"
 	"math/big"
@@ -49,7 +50,14 @@ func encodePayload(params ...interface{}) []byte {
 // For the decoding rules, please see package rlp.
 func (msg Msg) Decode(val interface{}) error {
 	s := rlp.NewListStream(msg.Payload, uint64(msg.Size))
-	return s.Decode(val)
+	if err := s.Decode(val); err != nil {
+		return newPeerError(errInvalidMsg, "(code %#x) (size %d) %v", msg.Code, msg.Size, err)
+	}
+	return nil
+}
+
+func (msg Msg) String() string {
+	return fmt.Sprintf("msg #%v (%v bytes)", msg.Code, msg.Size)
 }
 
 // Discard reads any remaining payload data into a black hole.

p2p/peer.go

@@ -45,8 +45,8 @@ func (d peerAddr) String() string {
 	return fmt.Sprintf("%v:%d", d.IP, d.Port)
 }
 
-func (d peerAddr) RlpData() interface{} {
-	return []interface{}{d.IP, d.Port, d.Pubkey}
+func (d *peerAddr) RlpData() interface{} {
+	return []interface{}{string(d.IP), d.Port, d.Pubkey}
 }
 
 // Peer represents a remote peer.
@@ -426,7 +426,7 @@ func (rw *proto) WriteMsg(msg Msg) error {
 }
 
 func (rw *proto) EncodeMsg(code uint64, data ...interface{}) error {
-	return rw.WriteMsg(NewMsg(code, data))
+	return rw.WriteMsg(NewMsg(code, data...))
 }
 
 func (rw *proto) ReadMsg() (Msg, error) {
@@ -460,3 +460,25 @@ func (r *eofSignal) Read(buf []byte) (int, error) {
 	}
 	return n, err
 }
+
+func (peer *Peer) PeerList() []interface{} {
+	peers := peer.otherPeers()
+	ds := make([]interface{}, 0, len(peers))
+	for _, p := range peers {
+		p.infolock.Lock()
+		addr := p.listenAddr
+		p.infolock.Unlock()
+		// filter out this peer and peers that are not listening or
+		// have not completed the handshake.
+		// TODO: track previously sent peers and exclude them as well.
+		if p == peer || addr == nil {
+			continue
+		}
+		ds = append(ds, addr)
+	}
+	ourAddr := peer.ourListenAddr
+	if ourAddr != nil && !ourAddr.IP.IsLoopback() && !ourAddr.IP.IsUnspecified() {
+		ds = append(ds, ourAddr)
+	}
+	return ds
+}

p2p/peer_test.go

@@ -30,9 +30,8 @@ var discard = Protocol{
 
 func testPeer(protos []Protocol) (net.Conn, *Peer, <-chan error) {
 	conn1, conn2 := net.Pipe()
-	id := NewSimpleClientIdentity("test", "0", "0", "public key")
 	peer := newPeer(conn1, protos, nil)
-	peer.ourID = id
+	peer.ourID = &peerId{}
 	peer.pubkeyHook = func(*peerAddr) error { return nil }
 	errc := make(chan error, 1)
 	go func() {
@@ -130,7 +129,7 @@ func TestPeerProtoEncodeMsg(t *testing.T) {
 			if err := rw.EncodeMsg(2); err == nil {
 				t.Error("expected error for out-of-range msg code, got nil")
 			}
-			if err := rw.EncodeMsg(1); err != nil {
+			if err := rw.EncodeMsg(1, "foo", "bar"); err != nil {
 				t.Errorf("write error: %v", err)
 			}
 			return nil
@@ -148,6 +147,13 @@ func TestPeerProtoEncodeMsg(t *testing.T) {
 	if msg.Code != 17 {
 		t.Errorf("incorrect message code: got %d, expected %d", msg.Code, 17)
 	}
+	var data []string
+	if err := msg.Decode(&data); err != nil {
+		t.Errorf("payload decode error: %v", err)
+	}
+	if !reflect.DeepEqual(data, []string{"foo", "bar"}) {
+		t.Errorf("payload RLP mismatch, got %#v, want %#v", data, []string{"foo", "bar"})
+	}
 }
 
 func TestPeerWrite(t *testing.T) {
@@ -226,8 +232,8 @@ func TestPeerActivity(t *testing.T) {
 }
 
 func TestNewPeer(t *testing.T) {
-	id := NewSimpleClientIdentity("clientid", "version", "customid", "pubkey")
 	caps := []Cap{{"foo", 2}, {"bar", 3}}
+	id := &peerId{}
 	p := NewPeer(id, caps)
 	if !reflect.DeepEqual(p.Caps(), caps) {
 		t.Errorf("Caps mismatch: got %v, expected %v", p.Caps(), caps)

p2p/protocol.go

@@ -3,8 +3,6 @@ package p2p
 import (
 	"bytes"
 	"time"
-
-	"github.com/ethereum/go-ethereum/ethutil"
 )
 
 // Protocol represents a P2P subprotocol implementation.
@@ -89,20 +87,25 @@ type baseProtocol struct {
 
 func runBaseProtocol(peer *Peer, rw MsgReadWriter) error {
 	bp := &baseProtocol{rw, peer}
-	if err := bp.doHandshake(rw); err != nil {
+	errc := make(chan error, 1)
+	go func() { errc <- rw.WriteMsg(bp.handshakeMsg()) }()
+	if err := bp.readHandshake(); err != nil {
+		return err
+	}
+	// handle write error
+	if err := <-errc; err != nil {
 		return err
 	}
 	// run main loop
-	quit := make(chan error, 1)
 	go func() {
 		for {
 			if err := bp.handle(rw); err != nil {
-				quit <- err
+				errc <- err
 				break
 			}
 		}
 	}()
-	return bp.loop(quit)
+	return bp.loop(errc)
 }
 
 var pingTimeout = 2 * time.Second
@@ -166,7 +169,7 @@ func (bp *baseProtocol) handle(rw MsgReadWriter) error {
 	case pongMsg:
 
 	case getPeersMsg:
-		peers := bp.peerList()
+		peers := bp.peer.PeerList()
 		// this is dangerous. the spec says that we should _delay_
 		// sending the response if no new information is available.
 		// this means that would need to send a response later when
@@ -174,7 +177,7 @@ func (bp *baseProtocol) handle(rw MsgReadWriter) error {
 		//
 		// TODO: add event mechanism to notify baseProtocol for new peers
 		if len(peers) > 0 {
-			return bp.rw.EncodeMsg(peersMsg, peers)
+			return bp.rw.EncodeMsg(peersMsg, peers...)
 		}
 
 	case peersMsg:
@@ -193,14 +196,9 @@ func (bp *baseProtocol) handle(rw MsgReadWriter) error {
 	return nil
 }
 
-func (bp *baseProtocol) doHandshake(rw MsgReadWriter) error {
-	// send our handshake
-	if err := rw.WriteMsg(bp.handshakeMsg()); err != nil {
-		return err
-	}
-
+func (bp *baseProtocol) readHandshake() error {
 	// read and handle remote handshake
-	msg, err := rw.ReadMsg()
+	msg, err := bp.rw.ReadMsg()
 	if err != nil {
 		return err
 	}
@@ -210,12 +208,10 @@ func (bp *baseProtocol) doHandshake(rw MsgReadWriter) error {
 	if msg.Size > baseProtocolMaxMsgSize {
 		return newPeerError(errMisc, "message too big")
 	}
-
 	var hs handshake
 	if err := msg.Decode(&hs); err != nil {
 		return err
 	}
-
 	// validate handshake info
 	if hs.Version != baseProtocolVersion {
 		return newPeerError(errP2PVersionMismatch, "Require protocol %d, received %d\n",
@@ -238,9 +234,7 @@ func (bp *baseProtocol) doHandshake(rw MsgReadWriter) error {
 	if err := bp.peer.pubkeyHook(pa); err != nil {
 		return newPeerError(errPubkeyForbidden, "%v", err)
 	}
-
 	// TODO: remove Caps with empty name
-
 	var addr *peerAddr
 	if hs.ListenPort != 0 {
 		addr = newPeerAddr(bp.peer.conn.RemoteAddr(), hs.NodeID)
@@ -270,25 +264,3 @@ func (bp *baseProtocol) handshakeMsg() Msg {
 		bp.peer.ourID.Pubkey()[1:],
 	)
 }
-
-func (bp *baseProtocol) peerList() []ethutil.RlpEncodable {
-	peers := bp.peer.otherPeers()
-	ds := make([]ethutil.RlpEncodable, 0, len(peers))
-	for _, p := range peers {
-		p.infolock.Lock()
-		addr := p.listenAddr
-		p.infolock.Unlock()
-		// filter out this peer and peers that are not listening or
-		// have not completed the handshake.
-		// TODO: track previously sent peers and exclude them as well.
-		if p == bp.peer || addr == nil {
-			continue
-		}
-		ds = append(ds, addr)
-	}
-	ourAddr := bp.peer.ourListenAddr
-	if ourAddr != nil && !ourAddr.IP.IsLoopback() && !ourAddr.IP.IsUnspecified() {
-		ds = append(ds, ourAddr)
-	}
-	return ds
-}

p2p/protocol_test.go

@@ -2,12 +2,89 @@ package p2p
 
 import (
 	"fmt"
+	"net"
+	"reflect"
 	"testing"
+
+	"github.com/ethereum/go-ethereum/crypto"
 )
 
+type peerId struct {
+	pubkey []byte
+}
+
+func (self *peerId) String() string {
+	return fmt.Sprintf("test peer %x", self.Pubkey()[:4])
+}
+
+func (self *peerId) Pubkey() (pubkey []byte) {
+	pubkey = self.pubkey
+	if len(pubkey) == 0 {
+		pubkey = crypto.GenerateNewKeyPair().PublicKey
+		self.pubkey = pubkey
+	}
+	return
+}
+
+func newTestPeer() (peer *Peer) {
+	peer = NewPeer(&peerId{}, []Cap{})
+	peer.pubkeyHook = func(*peerAddr) error { return nil }
+	peer.ourID = &peerId{}
+	peer.listenAddr = &peerAddr{}
+	peer.otherPeers = func() []*Peer { return nil }
+	return
+}
+
+func TestBaseProtocolPeers(t *testing.T) {
+	cannedPeerList := []*peerAddr{
+		{IP: net.ParseIP("1.2.3.4"), Port: 2222, Pubkey: []byte{}},
+		{IP: net.ParseIP("5.6.7.8"), Port: 3333, Pubkey: []byte{}},
+	}
+	var ownAddr *peerAddr = &peerAddr{IP: net.ParseIP("1.3.5.7"), Port: 1111, Pubkey: []byte{}}
+	rw1, rw2 := MsgPipe()
+	// run matcher, close pipe when addresses have arrived
+	addrChan := make(chan *peerAddr, len(cannedPeerList))
+	go func() {
+		for _, want := range cannedPeerList {
+			got := <-addrChan
+			t.Logf("got peer: %+v", got)
+			if !reflect.DeepEqual(want, got) {
+				t.Errorf("mismatch:  got %#v, want %#v", got, want)
+			}
+		}
+		close(addrChan)
+		var own []*peerAddr
+		var got *peerAddr
+		for got = range addrChan {
+			own = append(own, got)
+		}
+		if len(own) != 1 || !reflect.DeepEqual(ownAddr, own[0]) {
+			t.Errorf("mismatch: peers own address is incorrectly or not given, got %v, want %#v", ownAddr)
+		}
+		rw2.Close()
+	}()
+	// run first peer
+	peer1 := newTestPeer()
+	peer1.ourListenAddr = ownAddr
+	peer1.otherPeers = func() []*Peer {
+		pl := make([]*Peer, len(cannedPeerList))
+		for i, addr := range cannedPeerList {
+			pl[i] = &Peer{listenAddr: addr}
+		}
+		return pl
+	}
+	go runBaseProtocol(peer1, rw1)
+	// run second peer
+	peer2 := newTestPeer()
+	peer2.newPeerAddr = addrChan // feed peer suggestions into matcher
+	if err := runBaseProtocol(peer2, rw2); err != ErrPipeClosed {
+		t.Errorf("peer2 terminated with unexpected error: %v", err)
+	}
+}
+
 func TestBaseProtocolDisconnect(t *testing.T) {
-	peer := NewPeer(NewSimpleClientIdentity("p1", "", "", "foo"), nil)
-	peer.ourID = NewSimpleClientIdentity("p2", "", "", "bar")
+	peer := NewPeer(&peerId{}, nil)
+	peer.ourID = &peerId{}
 	peer.pubkeyHook = func(*peerAddr) error { return nil }
 
 	rw1, rw2 := MsgPipe()
@@ -32,6 +109,7 @@ func TestBaseProtocolDisconnect(t *testing.T) {
 		if err := rw2.EncodeMsg(discMsg, DiscQuitting); err != nil {
 			t.Error(err)
 		}
+
 		close(done)
 	}()
 

p2p/server.go

@@ -113,9 +113,11 @@ func (srv *Server) PeerCount() int {
 
 // SuggestPeer injects an address into the outbound address pool.
 func (srv *Server) SuggestPeer(ip net.IP, port int, nodeID []byte) {
+	addr := &peerAddr{ip, uint64(port), nodeID}
 	select {
-	case srv.peerConnect <- &peerAddr{ip, uint64(port), nodeID}:
+	case srv.peerConnect <- addr:
 	default: // don't block
+		srvlog.Warnf("peer suggestion %v ignored", addr)
 	}
 }
 
@@ -258,6 +260,7 @@ func (srv *Server) listenLoop() {
 	for {
 		select {
 		case slot := <-srv.peerSlots:
+			srvlog.Debugf("grabbed slot %v for listening", slot)
 			conn, err := srv.listener.Accept()
 			if err != nil {
 				srv.peerSlots <- slot
@@ -330,6 +333,7 @@ func (srv *Server) dialLoop() {
 		case desc := <-suggest:
 			// candidate peer found, will dial out asyncronously
 			// if connection fails slot will be released
+			srvlog.Infof("dial %v (%v)", desc, *slot)
 			go srv.dialPeer(desc, *slot)
 			// we can watch if more peers needed in the next loop
 			slots = srv.peerSlots

p2p/server_test.go

@@ -11,7 +11,7 @@ import (
 
 func startTestServer(t *testing.T, pf peerFunc) *Server {
 	server := &Server{
-		Identity:    NewSimpleClientIdentity("clientIdentifier", "version", "customIdentifier", "pubkey"),
+		Identity:    &peerId{},
 		MaxPeers:    10,
 		ListenAddr:  "127.0.0.1:0",
 		newPeerFunc: pf,

rlp/decode.go

@@ -76,22 +76,37 @@ func Decode(r io.Reader, val interface{}) error {
 type decodeError struct {
 	msg string
 	typ reflect.Type
+	ctx []string
 }
 
-func (err decodeError) Error() string {
-	return fmt.Sprintf("rlp: %s for %v", err.msg, err.typ)
+func (err *decodeError) Error() string {
+	ctx := ""
+	if len(err.ctx) > 0 {
+		ctx = ", decoding into "
+		for i := len(err.ctx) - 1; i >= 0; i-- {
+			ctx += err.ctx[i]
+		}
+	}
+	return fmt.Sprintf("rlp: %s for %v%s", err.msg, err.typ, ctx)
 }
 
 func wrapStreamError(err error, typ reflect.Type) error {
 	switch err {
 	case ErrExpectedList:
-		return decodeError{"expected input list", typ}
+		return &decodeError{msg: "expected input list", typ: typ}
 	case ErrExpectedString:
-		return decodeError{"expected input string or byte", typ}
+		return &decodeError{msg: "expected input string or byte", typ: typ}
 	case errUintOverflow:
-		return decodeError{"input string too long", typ}
+		return &decodeError{msg: "input string too long", typ: typ}
 	case errNotAtEOL:
-		return decodeError{"input list has too many elements", typ}
+		return &decodeError{msg: "input list has too many elements", typ: typ}
+	}
+	return err
+}
+
+func addErrorContext(err error, ctx string) error {
+	if decErr, ok := err.(*decodeError); ok {
+		decErr.ctx = append(decErr.ctx, ctx)
 	}
 	return err
 }
@@ -180,13 +195,13 @@ func makeListDecoder(typ reflect.Type) (decoder, error) {
 		return nil, err
 	}
 
-	if typ.Kind() == reflect.Array {
-		return func(s *Stream, val reflect.Value) error {
-			return decodeListArray(s, val, etypeinfo.decoder)
-		}, nil
-	}
+	isArray := typ.Kind() == reflect.Array
 	return func(s *Stream, val reflect.Value) error {
-		return decodeListSlice(s, val, etypeinfo.decoder)
+		if isArray {
+			return decodeListArray(s, val, etypeinfo.decoder)
+		} else {
+			return decodeListSlice(s, val, etypeinfo.decoder)
+		}
 	}, nil
 }
 
@@ -219,7 +234,7 @@ func decodeListSlice(s *Stream, val reflect.Value, elemdec decoder) error {
 		if err := elemdec(s, val.Index(i)); err == EOL {
 			break
 		} else if err != nil {
-			return err
+			return addErrorContext(err, fmt.Sprint("[", i, "]"))
 		}
 	}
 	if i < val.Len() {
@@ -248,7 +263,7 @@ func decodeListArray(s *Stream, val reflect.Value, elemdec decoder) error {
 		if err := elemdec(s, val.Index(i)); err == EOL {
 			break
 		} else if err != nil {
-			return err
+			return addErrorContext(err, fmt.Sprint("[", i, "]"))
 		}
 	}
 	if i < vlen {
@@ -280,14 +295,14 @@ func decodeByteArray(s *Stream, val reflect.Value) error {
 	switch kind {
 	case Byte:
 		if val.Len() == 0 {
-			return decodeError{"input string too long", val.Type()}
+			return &decodeError{msg: "input string too long", typ: val.Type()}
 		}
 		bv, _ := s.Uint()
 		val.Index(0).SetUint(bv)
 		zero(val, 1)
 	case String:
 		if uint64(val.Len()) < size {
-			return decodeError{"input string too long", val.Type()}
+			return &decodeError{msg: "input string too long", typ: val.Type()}
 		}
 		slice := val.Slice(0, int(size)).Interface().([]byte)
 		if err := s.readFull(slice); err != nil {
@@ -334,7 +349,7 @@ func makeStructDecoder(typ reflect.Type) (decoder, error) {
 				// too few elements. leave the rest at their zero value.
 				break
 			} else if err != nil {
-				return err
+				return addErrorContext(err, "."+typ.Field(f.index).Name)
 			}
 		}
 		return wrapStreamError(s.ListEnd(), typ)
@@ -599,7 +614,13 @@ func (s *Stream) Decode(val interface{}) error {
 	if err != nil {
 		return err
 	}
-	return info.decoder(s, rval.Elem())
+
+	err = info.decoder(s, rval.Elem())
+	if decErr, ok := err.(*decodeError); ok && len(decErr.ctx) > 0 {
+		// add decode target type to error so context has more meaning
+		decErr.ctx = append(decErr.ctx, fmt.Sprint("(", rtyp.Elem(), ")"))
+	}
+	return err
 }
 
 // Reset discards any information about the current decoding context

rlp/decode_test.go

@@ -231,7 +231,12 @@ var decodeTests = []decodeTest{
 	{input: "8D6162636465666768696A6B6C6D", ptr: new([]byte), value: []byte("abcdefghijklm")},
 	{input: "C0", ptr: new([]byte), value: []byte{}},
 	{input: "C3010203", ptr: new([]byte), value: []byte{1, 2, 3}},
-	{input: "C3820102", ptr: new([]byte), error: "rlp: input string too long for uint8"},
+
+	{
+		input: "C3820102",
+		ptr:   new([]byte),
+		error: "rlp: input string too long for uint8, decoding into ([]uint8)[0]",
+	},
 
 	// byte arrays
 	{input: "01", ptr: new([5]byte), value: [5]byte{1}},
@@ -239,9 +244,22 @@ var decodeTests = []decodeTest{
 	{input: "850102030405", ptr: new([5]byte), value: [5]byte{1, 2, 3, 4, 5}},
 	{input: "C0", ptr: new([5]byte), value: [5]byte{}},
 	{input: "C3010203", ptr: new([5]byte), value: [5]byte{1, 2, 3, 0, 0}},
-	{input: "C3820102", ptr: new([5]byte), error: "rlp: input string too long for uint8"},
-	{input: "86010203040506", ptr: new([5]byte), error: "rlp: input string too long for [5]uint8"},
-	{input: "850101", ptr: new([5]byte), error: io.ErrUnexpectedEOF.Error()},
+
+	{
+		input: "C3820102",
+		ptr:   new([5]byte),
+		error: "rlp: input string too long for uint8, decoding into ([5]uint8)[0]",
+	},
+	{
+		input: "86010203040506",
+		ptr:   new([5]byte),
+		error: "rlp: input string too long for [5]uint8",
+	},
+	{
+		input: "850101",
+		ptr:   new([5]byte),
+		error: io.ErrUnexpectedEOF.Error(),
+	},
 
 	// byte array reuse (should be zeroed)
 	{input: "850102030405", ptr: &sharedByteArray, value: [5]byte{1, 2, 3, 4, 5}},
@@ -272,13 +290,23 @@ var decodeTests = []decodeTest{
 	{input: "C0", ptr: new(simplestruct), value: simplestruct{0, ""}},
 	{input: "C105", ptr: new(simplestruct), value: simplestruct{5, ""}},
 	{input: "C50583343434", ptr: new(simplestruct), value: simplestruct{5, "444"}},
-	{input: "C3010101", ptr: new(simplestruct), error: "rlp: input list has too many elements for rlp.simplestruct"},
 	{
 		input: "C501C302C103",
 		ptr:   new(recstruct),
 		value: recstruct{1, &recstruct{2, &recstruct{3, nil}}},
 	},
 
+	{
+		input: "C3010101",
+		ptr:   new(simplestruct),
+		error: "rlp: input list has too many elements for rlp.simplestruct",
+	},
+	{
+		input: "C501C3C00000",
+		ptr:   new(recstruct),
+		error: "rlp: expected input string or byte for uint, decoding into (rlp.recstruct).Child.I",
+	},
+
 	// pointers
 	{input: "00", ptr: new(*uint), value: (*uint)(nil)},
 	{input: "80", ptr: new(*uint), value: (*uint)(nil)},