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handlers.go
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handlers.go
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// Copyright 2021 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package eth
import (
"encoding/json"
"fmt"
"github.com/blockcypher/go-ethereum/common"
"github.com/blockcypher/go-ethereum/core/types"
"github.com/blockcypher/go-ethereum/log"
"github.com/blockcypher/go-ethereum/rlp"
"github.com/blockcypher/go-ethereum/trie"
)
// handleGetBlockHeaders66 is the eth/66 version of handleGetBlockHeaders
func handleGetBlockHeaders66(backend Backend, msg Decoder, peer *Peer) error {
// Decode the complex header query
var query GetBlockHeadersPacket66
if err := msg.Decode(&query); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
response := ServiceGetBlockHeadersQuery(backend.Chain(), query.GetBlockHeadersPacket, peer)
return peer.ReplyBlockHeadersRLP(query.RequestId, response)
}
// ServiceGetBlockHeadersQuery assembles the response to a header query. It is
// exposed to allow external packages to test protocol behavior.
func ServiceGetBlockHeadersQuery(chain HandlerBlockchain, query *GetBlockHeadersPacket, peer *Peer) []rlp.RawValue {
if query.Skip == 0 {
// The fast path: when the request is for a contiguous segment of headers.
return serviceContiguousBlockHeaderQuery(chain, query)
} else {
return serviceNonContiguousBlockHeaderQuery(chain, query, peer)
}
}
func serviceNonContiguousBlockHeaderQuery(chain HandlerBlockchain, query *GetBlockHeadersPacket, peer *Peer) []rlp.RawValue {
hashMode := query.Origin.Hash != (common.Hash{})
first := true
maxNonCanonical := uint64(100)
// Gather headers until the fetch or network limits is reached
var (
bytes common.StorageSize
headers []rlp.RawValue
unknown bool
lookups int
)
for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit &&
len(headers) < maxHeadersServe && lookups < 2*maxHeadersServe {
lookups++
// Retrieve the next header satisfying the query
var origin *types.Header
if hashMode {
if first {
first = false
origin = chain.GetHeaderByHash(query.Origin.Hash)
if origin != nil {
query.Origin.Number = origin.Number.Uint64()
}
} else {
origin = chain.GetHeader(query.Origin.Hash, query.Origin.Number)
}
} else {
origin = chain.GetHeaderByNumber(query.Origin.Number)
}
if origin == nil {
break
}
if rlpData, err := rlp.EncodeToBytes(origin); err != nil {
log.Crit("Unable to decode our own headers", "err", err)
} else {
headers = append(headers, rlp.RawValue(rlpData))
bytes += common.StorageSize(len(rlpData))
}
// Advance to the next header of the query
switch {
case hashMode && query.Reverse:
// Hash based traversal towards the genesis block
ancestor := query.Skip + 1
if ancestor == 0 {
unknown = true
} else {
query.Origin.Hash, query.Origin.Number = chain.GetAncestor(query.Origin.Hash, query.Origin.Number, ancestor, &maxNonCanonical)
unknown = (query.Origin.Hash == common.Hash{})
}
case hashMode && !query.Reverse:
// Hash based traversal towards the leaf block
var (
current = origin.Number.Uint64()
next = current + query.Skip + 1
)
if next <= current {
infos, _ := json.MarshalIndent(peer.Peer.Info(), "", " ")
peer.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", query.Skip, "next", next, "attacker", infos)
unknown = true
} else {
if header := chain.GetHeaderByNumber(next); header != nil {
nextHash := header.Hash()
expOldHash, _ := chain.GetAncestor(nextHash, next, query.Skip+1, &maxNonCanonical)
if expOldHash == query.Origin.Hash {
query.Origin.Hash, query.Origin.Number = nextHash, next
} 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 headers
}
func serviceContiguousBlockHeaderQuery(chain HandlerBlockchain, query *GetBlockHeadersPacket) []rlp.RawValue {
count := query.Amount
if count > maxHeadersServe {
count = maxHeadersServe
}
if query.Origin.Hash == (common.Hash{}) {
// Number mode, just return the canon chain segment. The backend
// delivers in [N, N-1, N-2..] descending order, so we need to
// accommodate for that.
from := query.Origin.Number
if !query.Reverse {
from = from + count - 1
}
headers := chain.GetHeadersFrom(from, count)
if !query.Reverse {
for i, j := 0, len(headers)-1; i < j; i, j = i+1, j-1 {
headers[i], headers[j] = headers[j], headers[i]
}
}
return headers
}
// Hash mode.
var (
headers []rlp.RawValue
hash = query.Origin.Hash
header = chain.GetHeaderByHash(hash)
)
if header != nil {
rlpData, _ := rlp.EncodeToBytes(header)
headers = append(headers, rlpData)
} else {
// We don't even have the origin header
return headers
}
num := header.Number.Uint64()
if !query.Reverse {
// Theoretically, we are tasked to deliver header by hash H, and onwards.
// However, if H is not canon, we will be unable to deliver any descendants of
// H.
if canonHash := chain.GetCanonicalHash(num); canonHash != hash {
// Not canon, we can't deliver descendants
return headers
}
descendants := chain.GetHeadersFrom(num+count-1, count-1)
for i, j := 0, len(descendants)-1; i < j; i, j = i+1, j-1 {
descendants[i], descendants[j] = descendants[j], descendants[i]
}
headers = append(headers, descendants...)
return headers
}
{ // Last mode: deliver ancestors of H
for i := uint64(1); header != nil && i < count; i++ {
header = chain.GetHeaderByHash(header.ParentHash)
if header == nil {
break
}
rlpData, _ := rlp.EncodeToBytes(header)
headers = append(headers, rlpData)
}
return headers
}
}
func handleGetBlockBodies66(backend Backend, msg Decoder, peer *Peer) error {
// Decode the block body retrieval message
var query GetBlockBodiesPacket66
if err := msg.Decode(&query); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
response := ServiceGetBlockBodiesQuery(backend.Chain(), query.GetBlockBodiesPacket)
return peer.ReplyBlockBodiesRLP(query.RequestId, response)
}
// ServiceGetBlockBodiesQuery assembles the response to a body query. It is
// exposed to allow external packages to test protocol behavior.
func ServiceGetBlockBodiesQuery(chain HandlerBlockchain, query GetBlockBodiesPacket) []rlp.RawValue {
// Gather blocks until the fetch or network limits is reached
var (
bytes int
bodies []rlp.RawValue
)
for lookups, hash := range query {
if bytes >= softResponseLimit || len(bodies) >= maxBodiesServe ||
lookups >= 2*maxBodiesServe {
break
}
if data := chain.GetBodyRLP(hash); len(data) != 0 {
bodies = append(bodies, data)
bytes += len(data)
}
}
return bodies
}
func handleGetNodeData66(backend Backend, msg Decoder, peer *Peer) error {
// Decode the trie node data retrieval message
var query GetNodeDataPacket66
if err := msg.Decode(&query); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
response := ServiceGetNodeDataQuery(backend.Chain(), query.GetNodeDataPacket)
return peer.ReplyNodeData(query.RequestId, response)
}
// ServiceGetNodeDataQuery assembles the response to a node data query. It is
// exposed to allow external packages to test protocol behavior.
func ServiceGetNodeDataQuery(chain HandlerBlockchain, query GetNodeDataPacket) [][]byte {
// Gather state data until the fetch or network limits is reached
var (
bytes int
nodes [][]byte
)
for lookups, hash := range query {
if bytes >= softResponseLimit || len(nodes) >= maxNodeDataServe ||
lookups >= 2*maxNodeDataServe {
break
}
// Retrieve the requested state entry
entry, err := chain.TrieNode(hash)
if len(entry) == 0 || err != nil {
// Read the contract code with prefix only to save unnecessary lookups.
entry, err = chain.ContractCodeWithPrefix(hash)
}
if err == nil && len(entry) > 0 {
nodes = append(nodes, entry)
bytes += len(entry)
}
}
return nodes
}
func handleGetReceipts66(backend Backend, msg Decoder, peer *Peer) error {
// Decode the block receipts retrieval message
var query GetReceiptsPacket66
if err := msg.Decode(&query); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
response := ServiceGetReceiptsQuery(backend.Chain(), query.GetReceiptsPacket)
return peer.ReplyReceiptsRLP(query.RequestId, response)
}
// ServiceGetReceiptsQuery assembles the response to a receipt query. It is
// exposed to allow external packages to test protocol behavior.
func ServiceGetReceiptsQuery(chain HandlerBlockchain, query GetReceiptsPacket) []rlp.RawValue {
// Gather state data until the fetch or network limits is reached
var (
bytes int
receipts []rlp.RawValue
)
for lookups, hash := range query {
if bytes >= softResponseLimit || len(receipts) >= maxReceiptsServe ||
lookups >= 2*maxReceiptsServe {
break
}
// Retrieve the requested block's receipts
results := chain.GetReceiptsByHash(hash)
if results == nil {
if header := chain.GetHeaderByHash(hash); header == nil || header.ReceiptHash != types.EmptyRootHash {
continue
}
}
// If known, encode and queue for response packet
if encoded, err := rlp.EncodeToBytes(results); err != nil {
log.Error("Failed to encode receipt", "err", err)
} else {
receipts = append(receipts, encoded)
bytes += len(encoded)
}
}
return receipts
}
func handleNewBlockhashes(backend Backend, msg Decoder, peer *Peer) error {
// A batch of new block announcements just arrived
ann := new(NewBlockHashesPacket)
if err := msg.Decode(ann); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
// Mark the hashes as present at the remote node
for _, block := range *ann {
peer.markBlock(block.Hash)
}
// Deliver them all to the backend for queuing
return backend.Handle(peer, ann)
}
func handleNewBlock(backend Backend, msg Decoder, peer *Peer) error {
// Retrieve and decode the propagated block
ann := new(NewBlockPacket)
if err := msg.Decode(ann); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
if err := ann.sanityCheck(); err != nil {
return err
}
if hash := types.CalcUncleHash(ann.Block.Uncles()); hash != ann.Block.UncleHash() {
log.Warn("Propagated block has invalid uncles", "have", hash, "exp", ann.Block.UncleHash())
return nil // TODO(karalabe): return error eventually, but wait a few releases
}
if hash := types.DeriveSha(ann.Block.Transactions(), trie.NewStackTrie(nil)); hash != ann.Block.TxHash() {
log.Warn("Propagated block has invalid body", "have", hash, "exp", ann.Block.TxHash())
return nil // TODO(karalabe): return error eventually, but wait a few releases
}
ann.Block.ReceivedAt = msg.Time()
ann.Block.ReceivedFrom = peer
// Mark the peer as owning the block
peer.markBlock(ann.Block.Hash())
return backend.Handle(peer, ann)
}
func handleBlockHeaders66(backend Backend, msg Decoder, peer *Peer) error {
// A batch of headers arrived to one of our previous requests
res := new(BlockHeadersPacket66)
if err := msg.Decode(res); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
metadata := func() interface{} {
hashes := make([]common.Hash, len(res.BlockHeadersPacket))
for i, header := range res.BlockHeadersPacket {
hashes[i] = header.Hash()
}
return hashes
}
return peer.dispatchResponse(&Response{
id: res.RequestId,
code: BlockHeadersMsg,
Res: &res.BlockHeadersPacket,
}, metadata)
}
func handleBlockBodies66(backend Backend, msg Decoder, peer *Peer) error {
// A batch of block bodies arrived to one of our previous requests
res := new(BlockBodiesPacket66)
if err := msg.Decode(res); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
metadata := func() interface{} {
var (
txsHashes = make([]common.Hash, len(res.BlockBodiesPacket))
uncleHashes = make([]common.Hash, len(res.BlockBodiesPacket))
)
hasher := trie.NewStackTrie(nil)
for i, body := range res.BlockBodiesPacket {
txsHashes[i] = types.DeriveSha(types.Transactions(body.Transactions), hasher)
uncleHashes[i] = types.CalcUncleHash(body.Uncles)
}
return [][]common.Hash{txsHashes, uncleHashes}
}
return peer.dispatchResponse(&Response{
id: res.RequestId,
code: BlockBodiesMsg,
Res: &res.BlockBodiesPacket,
}, metadata)
}
func handleNodeData66(backend Backend, msg Decoder, peer *Peer) error {
// A batch of node state data arrived to one of our previous requests
res := new(NodeDataPacket66)
if err := msg.Decode(res); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
return peer.dispatchResponse(&Response{
id: res.RequestId,
code: NodeDataMsg,
Res: &res.NodeDataPacket,
}, nil) // No post-processing, we're not using this packet anymore
}
func handleReceipts66(backend Backend, msg Decoder, peer *Peer) error {
// A batch of receipts arrived to one of our previous requests
res := new(ReceiptsPacket66)
if err := msg.Decode(res); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
metadata := func() interface{} {
hasher := trie.NewStackTrie(nil)
hashes := make([]common.Hash, len(res.ReceiptsPacket))
for i, receipt := range res.ReceiptsPacket {
hashes[i] = types.DeriveSha(types.Receipts(receipt), hasher)
}
return hashes
}
return peer.dispatchResponse(&Response{
id: res.RequestId,
code: ReceiptsMsg,
Res: &res.ReceiptsPacket,
}, metadata)
}
func handleNewPooledTransactionHashes(backend Backend, msg Decoder, peer *Peer) error {
// New transaction announcement arrived, make sure we have
// a valid and fresh chain to handle them
if !backend.AcceptTxs() {
return nil
}
ann := new(NewPooledTransactionHashesPacket)
if err := msg.Decode(ann); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
// Schedule all the unknown hashes for retrieval
for _, hash := range *ann {
peer.markTransaction(hash)
}
return backend.Handle(peer, ann)
}
func handleGetPooledTransactions66(backend Backend, msg Decoder, peer *Peer) error {
// Decode the pooled transactions retrieval message
var query GetPooledTransactionsPacket66
if err := msg.Decode(&query); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
hashes, txs := answerGetPooledTransactions(backend, query.GetPooledTransactionsPacket, peer)
return peer.ReplyPooledTransactionsRLP(query.RequestId, hashes, txs)
}
func answerGetPooledTransactions(backend Backend, query GetPooledTransactionsPacket, peer *Peer) ([]common.Hash, []rlp.RawValue) {
// Gather transactions until the fetch or network limits is reached
var (
bytes int
hashes []common.Hash
txs []rlp.RawValue
)
for _, hash := range query {
if bytes >= softResponseLimit {
break
}
// Retrieve the requested transaction, skipping if unknown to us
tx := backend.TxPool().Get(hash)
if tx == nil {
continue
}
// If known, encode and queue for response packet
if encoded, err := rlp.EncodeToBytes(tx); err != nil {
log.Error("Failed to encode transaction", "err", err)
} else {
hashes = append(hashes, hash)
txs = append(txs, encoded)
bytes += len(encoded)
}
}
return hashes, txs
}
func handleTransactions(backend Backend, msg Decoder, peer *Peer) error {
// Transactions arrived, make sure we have a valid and fresh chain to handle them
if !backend.AcceptTxs() {
return nil
}
// Transactions can be processed, parse all of them and deliver to the pool
var txs TransactionsPacket
if err := msg.Decode(&txs); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
for i, tx := range txs {
// Validate and mark the remote transaction
if tx == nil {
return fmt.Errorf("%w: transaction %d is nil", errDecode, i)
}
peer.markTransaction(tx.Hash())
}
return backend.Handle(peer, &txs)
}
func handlePooledTransactions66(backend Backend, msg Decoder, peer *Peer) error {
// Transactions arrived, make sure we have a valid and fresh chain to handle them
if !backend.AcceptTxs() {
return nil
}
// Transactions can be processed, parse all of them and deliver to the pool
var txs PooledTransactionsPacket66
if err := msg.Decode(&txs); err != nil {
return fmt.Errorf("%w: message %v: %v", errDecode, msg, err)
}
for i, tx := range txs.PooledTransactionsPacket {
// Validate and mark the remote transaction
if tx == nil {
return fmt.Errorf("%w: transaction %d is nil", errDecode, i)
}
peer.markTransaction(tx.Hash())
}
requestTracker.Fulfil(peer.id, peer.version, PooledTransactionsMsg, txs.RequestId)
return backend.Handle(peer, &txs.PooledTransactionsPacket)
}