// Decode parses the RLP content of a message into
// the given value, which must be a pointer.
//
// For the decoding rules, please see package rlp.
func (msg Msg) Decode(val interface{}) error {
s := rlp.NewStream(msg.Payload, uint64(msg.Size))
if err := s.Decode(val); err != nil {
return newPeerError(errInvalidMsg, "(code %x) (size %d) %v", msg.Code, msg.Size, err)
}
return nil
}
// handshake sends the protocol initiation status message to the remote peer and
// verifies the remote status too.
func (self *peer) handshake() error {
// Send the handshake status message asynchronously
errc := make(chan error, 1)
go func() {
errc <- p2p.SendItems(self.ws, statusCode, protocolVersion)
}()
// Fetch the remote status packet and verify protocol match
packet, err := self.ws.ReadMsg()
if err != nil {
return err
}
if packet.Code != statusCode {
return fmt.Errorf("peer sent %x before status packet", packet.Code)
}
s := rlp.NewStream(packet.Payload, uint64(packet.Size))
if _, err := s.List(); err != nil {
return fmt.Errorf("bad status message: %v", err)
}
peerVersion, err := s.Uint()
if err != nil {
return fmt.Errorf("bad status message: %v", err)
}
if peerVersion != protocolVersion {
return fmt.Errorf("protocol version mismatch %d != %d", peerVersion, protocolVersion)
}
// Wait until out own status is consumed too
if err := <-errc; err != nil {
return fmt.Errorf("failed to send status packet: %v", err)
}
return nil
}
// ImportChain imports a blockchain from a local file.
func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
// Make sure the can access the file to import
in, err := os.Open(file)
if err != nil {
return false, err
}
defer in.Close()
// Run actual the import in pre-configured batches
stream := rlp.NewStream(in, 0)
blocks, index := make([]*types.Block, 0, 2500), 0
for batch := 0; ; batch++ {
// Load a batch of blocks from the input file
for len(blocks) < cap(blocks) {
block := new(types.Block)
if err := stream.Decode(block); err == io.EOF {
break
} else if err != nil {
return false, fmt.Errorf("block %d: failed to parse: %v", index, err)
}
blocks = append(blocks, block)
index++
}
if len(blocks) == 0 {
break
}
if hasAllBlocks(api.eth.BlockChain(), blocks) {
blocks = blocks[:0]
continue
}
// Import the batch and reset the buffer
if _, err := api.eth.BlockChain().InsertChain(blocks); err != nil {
return false, fmt.Errorf("batch %d: failed to insert: %v", batch, err)
}
blocks = blocks[:0]
}
return true, nil
}
func ImportChain(chain *core.BlockChain, fn string) error {
// Watch for Ctrl-C while the import is running.
// If a signal is received, the import will stop at the next batch.
interrupt := make(chan os.Signal, 1)
stop := make(chan struct{})
signal.Notify(interrupt, os.Interrupt)
defer signal.Stop(interrupt)
defer close(interrupt)
go func() {
if _, ok := <-interrupt; ok {
glog.Info("caught interrupt during import, will stop at next batch")
}
close(stop)
}()
checkInterrupt := func() bool {
select {
case <-stop:
return true
default:
return false
}
}
glog.Infoln("Importing blockchain", fn)
fh, err := os.Open(fn)
if err != nil {
return err
}
defer fh.Close()
stream := rlp.NewStream(fh, 0)
// Run actual the import.
blocks := make(types.Blocks, importBatchSize)
n := 0
for batch := 0; ; batch++ {
// Load a batch of RLP blocks.
if checkInterrupt() {
return fmt.Errorf("interrupted")
}
i := 0
for ; i < importBatchSize; i++ {
var b types.Block
if err := stream.Decode(&b); err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("at block %d: %v", n, err)
}
// don't import first block
if b.NumberU64() == 0 {
i--
continue
}
blocks[i] = &b
n++
}
if i == 0 {
break
}
// Import the batch.
if checkInterrupt() {
return fmt.Errorf("interrupted")
}
if hasAllBlocks(chain, blocks[:i]) {
glog.Infof("skipping batch %d, all blocks present [%x / %x]",
batch, blocks[0].Hash().Bytes()[:4], blocks[i-1].Hash().Bytes()[:4])
continue
}
if _, err := chain.InsertChain(blocks[:i]); err != nil {
return fmt.Errorf("invalid block %d: %v", n, err)
}
}
return nil
}
// handleMsg is invoked whenever an inbound message is received from a remote
// peer. The remote connection is torn down upon returning any error.
func (pm *ProtocolManager) handleMsg(p *peer) error {
// Read the next message from the remote peer, and ensure it's fully consumed
msg, err := p.rw.ReadMsg()
if err != nil {
return err
}
if msg.Size > ProtocolMaxMsgSize {
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
}
defer msg.Discard()
// Handle the message depending on its contents
switch {
case msg.Code == StatusMsg:
// Status messages should never arrive after the handshake
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
case p.version < eth62 && msg.Code == GetBlockHashesMsg:
// Retrieve the number of hashes to return and from which origin hash
var request getBlockHashesData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
if request.Amount > uint64(downloader.MaxHashFetch) {
request.Amount = uint64(downloader.MaxHashFetch)
}
// Retrieve the hashes from the block chain and return them
hashes := pm.blockchain.GetBlockHashesFromHash(request.Hash, request.Amount)
if len(hashes) == 0 {
glog.V(logger.Debug).Infof("invalid block hash %x", request.Hash.Bytes()[:4])
}
return p.SendBlockHashes(hashes)
case p.version < eth62 && msg.Code == GetBlockHashesFromNumberMsg:
// Retrieve and decode the number of hashes to return and from which origin number
var request getBlockHashesFromNumberData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
if request.Amount > uint64(downloader.MaxHashFetch) {
request.Amount = uint64(downloader.MaxHashFetch)
}
// Calculate the last block that should be retrieved, and short circuit if unavailable
last := pm.blockchain.GetBlockByNumber(request.Number + request.Amount - 1)
if last == nil {
last = pm.blockchain.CurrentBlock()
request.Amount = last.NumberU64() - request.Number + 1
}
if last.NumberU64() < request.Number {
return p.SendBlockHashes(nil)
}
// Retrieve the hashes from the last block backwards, reverse and return
hashes := []common.Hash{last.Hash()}
hashes = append(hashes, pm.blockchain.GetBlockHashesFromHash(last.Hash(), request.Amount-1)...)
for i := 0; i < len(hashes)/2; i++ {
hashes[i], hashes[len(hashes)-1-i] = hashes[len(hashes)-1-i], hashes[i]
}
return p.SendBlockHashes(hashes)
case p.version < eth62 && msg.Code == BlockHashesMsg:
// A batch of hashes arrived to one of our previous requests
var hashes []common.Hash
if err := msg.Decode(&hashes); err != nil {
break
}
// Deliver them all to the downloader for queuing
err := pm.downloader.DeliverHashes(p.id, hashes)
if err != nil {
glog.V(logger.Debug).Infoln(err)
}
case p.version < eth62 && msg.Code == GetBlocksMsg:
// Decode the retrieval message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
if _, err := msgStream.List(); err != nil {
return err
}
// Gather blocks until the fetch or network limits is reached
var (
hash common.Hash
bytes common.StorageSize
blocks []*types.Block
)
for len(blocks) < downloader.MaxBlockFetch && bytes < softResponseLimit {
//Retrieve the hash of the next block
err := msgStream.Decode(&hash)
if err == rlp.EOL {
break
} else if err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Retrieve the requested block, stopping if enough was found
if block := pm.blockchain.GetBlock(hash); block != nil {
blocks = append(blocks, block)
bytes += block.Size()
}
}
return p.SendBlocks(blocks)
case p.version < eth62 && msg.Code == BlocksMsg:
// Decode the arrived block message
var blocks []*types.Block
if err := msg.Decode(&blocks); err != nil {
glog.V(logger.Detail).Infoln("Decode error", err)
blocks = nil
}
// Update the receive timestamp of each block
for _, block := range blocks {
block.ReceivedAt = msg.ReceivedAt
}
// Filter out any explicitly requested blocks, deliver the rest to the downloader
if blocks := pm.fetcher.FilterBlocks(blocks); len(blocks) > 0 {
pm.downloader.DeliverBlocks(p.id, blocks)
}
// Block header query, collect the requested headers and reply
case p.version >= eth62 && msg.Code == GetBlockHeadersMsg:
// Decode the complex header query
var query getBlockHeadersData
if err := msg.Decode(&query); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
hashMode := query.Origin.Hash != (common.Hash{})
// Gather headers until the fetch or network limits is reached
var (
bytes common.StorageSize
headers []*types.Header
unknown bool
)
for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit && len(headers) < downloader.MaxHeaderFetch {
// Retrieve the next header satisfying the query
var origin *types.Header
if hashMode {
origin = pm.blockchain.GetHeader(query.Origin.Hash)
} else {
origin = pm.blockchain.GetHeaderByNumber(query.Origin.Number)
}
if origin == nil {
break
}
headers = append(headers, origin)
bytes += estHeaderRlpSize
// Advance to the next header of the query
switch {
case query.Origin.Hash != (common.Hash{}) && query.Reverse:
// Hash based traversal towards the genesis block
for i := 0; i < int(query.Skip)+1; i++ {
if header := pm.blockchain.GetHeader(query.Origin.Hash); header != nil {
query.Origin.Hash = header.ParentHash
} else {
unknown = true
break
}
}
case query.Origin.Hash != (common.Hash{}) && !query.Reverse:
// Hash based traversal towards the leaf block
if header := pm.blockchain.GetHeaderByNumber(origin.Number.Uint64() + query.Skip + 1); header != nil {
if pm.blockchain.GetBlockHashesFromHash(header.Hash(), query.Skip+1)[query.Skip] == query.Origin.Hash {
query.Origin.Hash = header.Hash()
} else {
unknown = true
}
} else {
unknown = true
}
case query.Reverse:
// Number based traversal towards the genesis block
if query.Origin.Number >= query.Skip+1 {
query.Origin.Number -= (query.Skip + 1)
} else {
unknown = true
}
case !query.Reverse:
// Number based traversal towards the leaf block
query.Origin.Number += (query.Skip + 1)
}
}
return p.SendBlockHeaders(headers)
case p.version >= eth62 && msg.Code == BlockHeadersMsg:
// A batch of headers arrived to one of our previous requests
var headers []*types.Header
if err := msg.Decode(&headers); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Filter out any explicitly requested headers, deliver the rest to the downloader
filter := len(headers) == 1
if filter {
headers = pm.fetcher.FilterHeaders(headers, time.Now())
}
if len(headers) > 0 || !filter {
err := pm.downloader.DeliverHeaders(p.id, headers)
if err != nil {
glog.V(logger.Debug).Infoln(err)
}
}
case p.version >= eth62 && msg.Code == GetBlockBodiesMsg:
// Decode the retrieval message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
if _, err := msgStream.List(); err != nil {
return err
}
// Gather blocks until the fetch or network limits is reached
var (
hash common.Hash
bytes int
bodies []rlp.RawValue
)
for bytes < softResponseLimit && len(bodies) < downloader.MaxBlockFetch {
// Retrieve the hash of the next block
if err := msgStream.Decode(&hash); err == rlp.EOL {
break
} else if err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Retrieve the requested block body, stopping if enough was found
if data := pm.blockchain.GetBodyRLP(hash); len(data) != 0 {
bodies = append(bodies, data)
bytes += len(data)
}
}
return p.SendBlockBodiesRLP(bodies)
case p.version >= eth62 && msg.Code == BlockBodiesMsg:
// A batch of block bodies arrived to one of our previous requests
var request blockBodiesData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Deliver them all to the downloader for queuing
trasactions := make([][]*types.Transaction, len(request))
uncles := make([][]*types.Header, len(request))
for i, body := range request {
trasactions[i] = body.Transactions
uncles[i] = body.Uncles
}
// Filter out any explicitly requested bodies, deliver the rest to the downloader
if trasactions, uncles := pm.fetcher.FilterBodies(trasactions, uncles, time.Now()); len(trasactions) > 0 || len(uncles) > 0 {
err := pm.downloader.DeliverBodies(p.id, trasactions, uncles)
if err != nil {
glog.V(logger.Debug).Infoln(err)
}
}
case p.version >= eth63 && msg.Code == GetNodeDataMsg:
// Decode the retrieval message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
if _, err := msgStream.List(); err != nil {
return err
}
// Gather state data until the fetch or network limits is reached
var (
hash common.Hash
bytes int
data [][]byte
)
for bytes < softResponseLimit && len(data) < downloader.MaxStateFetch {
// Retrieve the hash of the next state entry
if err := msgStream.Decode(&hash); err == rlp.EOL {
break
} else if err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Retrieve the requested state entry, stopping if enough was found
if entry, err := pm.chaindb.Get(hash.Bytes()); err == nil {
data = append(data, entry)
bytes += len(entry)
}
}
return p.SendNodeData(data)
case p.version >= eth63 && msg.Code == NodeDataMsg:
// A batch of node state data arrived to one of our previous requests
var data [][]byte
if err := msg.Decode(&data); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Deliver all to the downloader
if err := pm.downloader.DeliverNodeData(p.id, data); err != nil {
glog.V(logger.Debug).Infof("failed to deliver node state data: %v", err)
}
case p.version >= eth63 && msg.Code == GetReceiptsMsg:
// Decode the retrieval message
msgStream := rlp.NewStream(msg.Payload, uint64(msg.Size))
if _, err := msgStream.List(); err != nil {
return err
}
// Gather state data until the fetch or network limits is reached
var (
hash common.Hash
bytes int
receipts []rlp.RawValue
)
for bytes < softResponseLimit && len(receipts) < downloader.MaxReceiptFetch {
// Retrieve the hash of the next block
if err := msgStream.Decode(&hash); err == rlp.EOL {
break
} else if err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Retrieve the requested block's receipts, skipping if unknown to us
results := core.GetBlockReceipts(pm.chaindb, hash)
if results == nil {
if header := pm.blockchain.GetHeader(hash); header == nil || header.ReceiptHash != types.EmptyRootHash {
continue
}
}
// If known, encode and queue for response packet
if encoded, err := rlp.EncodeToBytes(results); err != nil {
glog.V(logger.Error).Infof("failed to encode receipt: %v", err)
} else {
receipts = append(receipts, encoded)
bytes += len(encoded)
}
}
return p.SendReceiptsRLP(receipts)
case p.version >= eth63 && msg.Code == ReceiptsMsg:
// A batch of receipts arrived to one of our previous requests
var receipts [][]*types.Receipt
if err := msg.Decode(&receipts); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Deliver all to the downloader
if err := pm.downloader.DeliverReceipts(p.id, receipts); err != nil {
glog.V(logger.Debug).Infof("failed to deliver receipts: %v", err)
}
case msg.Code == NewBlockHashesMsg:
// Retrieve and deseralize the remote new block hashes notification
type announce struct {
Hash common.Hash
Number uint64
}
var announces = []announce{}
if p.version < eth62 {
// We're running the old protocol, make block number unknown (0)
var hashes []common.Hash
if err := msg.Decode(&hashes); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
for _, hash := range hashes {
announces = append(announces, announce{hash, 0})
}
} else {
// Otherwise extract both block hash and number
var request newBlockHashesData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
for _, block := range request {
announces = append(announces, announce{block.Hash, block.Number})
}
}
// Mark the hashes as present at the remote node
for _, block := range announces {
p.MarkBlock(block.Hash)
p.SetHead(block.Hash)
}
// Schedule all the unknown hashes for retrieval
unknown := make([]announce, 0, len(announces))
for _, block := range announces {
if !pm.blockchain.HasBlock(block.Hash) {
unknown = append(unknown, block)
}
}
for _, block := range unknown {
if p.version < eth62 {
pm.fetcher.Notify(p.id, block.Hash, block.Number, time.Now(), p.RequestBlocks, nil, nil)
} else {
pm.fetcher.Notify(p.id, block.Hash, block.Number, time.Now(), nil, p.RequestOneHeader, p.RequestBodies)
}
}
case msg.Code == NewBlockMsg:
// Retrieve and decode the propagated block
var request newBlockData
if err := msg.Decode(&request); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
if err := request.Block.ValidateFields(); err != nil {
return errResp(ErrDecode, "block validation %v: %v", msg, err)
}
request.Block.ReceivedAt = msg.ReceivedAt
// Mark the peer as owning the block and schedule it for import
p.MarkBlock(request.Block.Hash())
p.SetHead(request.Block.Hash())
pm.fetcher.Enqueue(p.id, request.Block)
// Update the peers total difficulty if needed, schedule a download if gapped
if request.TD.Cmp(p.Td()) > 0 {
p.SetTd(request.TD)
td := pm.blockchain.GetTd(pm.blockchain.CurrentBlock().Hash())
if request.TD.Cmp(new(big.Int).Add(td, request.Block.Difficulty())) > 0 {
go pm.synchronise(p)
}
}
case msg.Code == TxMsg:
// Transactions arrived, parse all of them and deliver to the pool
var txs []*types.Transaction
if err := msg.Decode(&txs); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
for i, tx := range txs {
// Validate and mark the remote transaction
if tx == nil {
return errResp(ErrDecode, "transaction %d is nil", i)
}
p.MarkTransaction(tx.Hash())
}
pm.txpool.AddTransactions(txs)
default:
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
}
return nil
}