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6eb42a6b4f
Here I am adding a discv5 nodes source into the p2p dial iterator. It's an improved version of #29533. Unlike discv4, the discv5 random nodes iterator will always provide full ENRs. This means we can apply filtering to the results and will only try dialing nodes which explictly opt into the eth protocol with a matching chain. I have also removed the dial iterator from snap. We don't have an official DNS list for snap anymore, and I doubt anyone else is running one. While we could potentially filter for snap on discv5, there will be very few nodes announcing it, and the extra iterator would just stall the dialer. --------- Co-authored-by: lightclient <lightclient@protonmail.com>
80 lines
2.5 KiB
Go
80 lines
2.5 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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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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