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https://github.com/ethereum/go-ethereum.git
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756310fa43
This fixes an issue where dial candidates from discv5 would be ignored because the "eth" ENR entry was not loaded correctly.
81 lines
2.6 KiB
Go
81 lines
2.6 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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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/forkid"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// enrEntry is the ENR entry which advertises `eth` protocol on the discovery.
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type enrEntry struct {
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ForkID forkid.ID // Fork identifier per EIP-2124
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// Ignore additional fields (for forward compatibility).
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Rest []rlp.RawValue `rlp:"tail"`
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}
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// ENRKey implements enr.Entry.
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func (e enrEntry) ENRKey() string {
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return "eth"
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}
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// StartENRUpdater starts the `eth` ENR updater loop, which listens for chain
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// head events and updates the requested node record whenever a fork is passed.
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func StartENRUpdater(chain *core.BlockChain, ln *enode.LocalNode) {
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var newHead = make(chan core.ChainHeadEvent, 10)
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sub := chain.SubscribeChainHeadEvent(newHead)
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ln.Set(currentENREntry(chain))
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go func() {
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defer sub.Unsubscribe()
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for {
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select {
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case <-newHead:
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ln.Set(currentENREntry(chain))
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case <-sub.Err():
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// Would be nice to sync with Stop, but there is no
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// good way to do that.
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return
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}
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}
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}()
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}
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// currentENREntry constructs an `eth` ENR entry based on the current state of the chain.
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func currentENREntry(chain *core.BlockChain) *enrEntry {
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head := chain.CurrentHeader()
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return &enrEntry{
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ForkID: forkid.NewID(chain.Config(), chain.Genesis(), head.Number.Uint64(), head.Time),
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}
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}
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// NewNodeFilter returns a filtering function that returns whether the provided
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// enode advertises a forkid compatible with the current chain.
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func NewNodeFilter(chain *core.BlockChain) func(*enode.Node) bool {
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filter := forkid.NewFilter(chain)
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return func(n *enode.Node) bool {
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var entry enrEntry
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if err := n.Load(&entry); err != nil {
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return false
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}
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err := filter(entry.ForkID)
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return err == nil
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}
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}
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