140 lines
4.9 KiB
Go
140 lines
4.9 KiB
Go
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"errors"
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"fmt"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth/protocols/eth"
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"github.com/ethereum/go-ethereum/p2p/enode"
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)
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// ethHandler implements the eth.Backend interface to handle the various network
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// packets that are sent as replies or broadcasts.
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type ethHandler handler
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func (h *ethHandler) Chain() *core.BlockChain { return h.chain }
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func (h *ethHandler) TxPool() eth.TxPool { return h.txpool }
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// RunPeer is invoked when a peer joins on the `eth` protocol.
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func (h *ethHandler) RunPeer(peer *eth.Peer, hand eth.Handler) error {
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return (*handler)(h).runEthPeer(peer, hand)
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}
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// PeerInfo retrieves all known `eth` information about a peer.
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func (h *ethHandler) PeerInfo(id enode.ID) interface{} {
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if p := h.peers.peer(id.String()); p != nil {
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return p.info()
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}
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return nil
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}
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// AcceptTxs retrieves whether transaction processing is enabled on the node
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// or if inbound transactions should simply be dropped.
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func (h *ethHandler) AcceptTxs() bool {
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return h.synced.Load()
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}
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// Handle is invoked from a peer's message handler when it receives a new remote
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// message that the handler couldn't consume and serve itself.
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func (h *ethHandler) Handle(peer *eth.Peer, packet eth.Packet) error {
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// Consume any broadcasts and announces, forwarding the rest to the downloader
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switch packet := packet.(type) {
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case *eth.NewBlockHashesPacket:
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hashes, numbers := packet.Unpack()
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return h.handleBlockAnnounces(peer, hashes, numbers)
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case *eth.NewBlockPacket:
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return h.handleBlockBroadcast(peer, packet.Block, packet.TD)
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case *eth.NewPooledTransactionHashesPacket:
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return h.txFetcher.Notify(peer.ID(), packet.Types, packet.Sizes, packet.Hashes)
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case *eth.TransactionsPacket:
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for _, tx := range *packet {
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if tx.Type() == types.BlobTxType {
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return errors.New("disallowed broadcast blob transaction")
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}
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}
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return h.txFetcher.Enqueue(peer.ID(), *packet, false)
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case *eth.PooledTransactionsResponse:
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return h.txFetcher.Enqueue(peer.ID(), *packet, true)
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default:
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return fmt.Errorf("unexpected eth packet type: %T", packet)
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}
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}
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// handleBlockAnnounces is invoked from a peer's message handler when it transmits a
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// batch of block announcements for the local node to process.
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func (h *ethHandler) handleBlockAnnounces(peer *eth.Peer, hashes []common.Hash, numbers []uint64) error {
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// Drop all incoming block announces from the p2p network if
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// the chain already entered the pos stage and disconnect the
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// remote peer.
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if h.merger.PoSFinalized() {
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return errors.New("disallowed block announcement")
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}
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// Schedule all the unknown hashes for retrieval
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var (
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unknownHashes = make([]common.Hash, 0, len(hashes))
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unknownNumbers = make([]uint64, 0, len(numbers))
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)
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for i := 0; i < len(hashes); i++ {
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if !h.chain.HasBlock(hashes[i], numbers[i]) {
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unknownHashes = append(unknownHashes, hashes[i])
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unknownNumbers = append(unknownNumbers, numbers[i])
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}
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}
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for i := 0; i < len(unknownHashes); i++ {
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h.blockFetcher.Notify(peer.ID(), unknownHashes[i], unknownNumbers[i], time.Now(), peer.RequestOneHeader, peer.RequestBodies)
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}
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return nil
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}
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// handleBlockBroadcast is invoked from a peer's message handler when it transmits a
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// block broadcast for the local node to process.
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func (h *ethHandler) handleBlockBroadcast(peer *eth.Peer, block *types.Block, td *big.Int) error {
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// Drop all incoming block announces from the p2p network if
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// the chain already entered the pos stage and disconnect the
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// remote peer.
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if h.merger.PoSFinalized() {
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return errors.New("disallowed block broadcast")
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}
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// Schedule the block for import
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h.blockFetcher.Enqueue(peer.ID(), block)
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// Assuming the block is importable by the peer, but possibly not yet done so,
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// calculate the head hash and TD that the peer truly must have.
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var (
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trueHead = block.ParentHash()
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trueTD = new(big.Int).Sub(td, block.Difficulty())
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)
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// Update the peer's total difficulty if better than the previous
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if _, td := peer.Head(); trueTD.Cmp(td) > 0 {
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peer.SetHead(trueHead, trueTD)
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h.chainSync.handlePeerEvent()
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}
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return nil
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}
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