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- // Copyright 2019 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 (
- "github.com/ethereum/go-ethereum/core"
- "github.com/ethereum/go-ethereum/core/forkid"
- "github.com/ethereum/go-ethereum/p2p/enode"
- "github.com/ethereum/go-ethereum/rlp"
- )
- // ethEntry is the "eth" ENR entry which advertises eth protocol
- // on the discovery network.
- type ethEntry struct {
- ForkID forkid.ID // Fork identifier per EIP-2124
- // Ignore additional fields (for forward compatibility).
- Rest []rlp.RawValue `rlp:"tail"`
- }
- // ENRKey implements enr.Entry.
- func (e ethEntry) ENRKey() string {
- return "eth"
- }
- // startEthEntryUpdate starts the ENR updater loop.
- func (eth *Ethereum) startEthEntryUpdate(ln *enode.LocalNode) {
- var newHead = make(chan core.ChainHeadEvent, 10)
- sub := eth.blockchain.SubscribeChainHeadEvent(newHead)
- go func() {
- defer sub.Unsubscribe()
- for {
- select {
- case <-newHead:
- ln.Set(eth.currentEthEntry())
- case <-sub.Err():
- // Would be nice to sync with eth.Stop, but there is no
- // good way to do that.
- return
- }
- }
- }()
- }
- func (eth *Ethereum) currentEthEntry() *ethEntry {
- return ðEntry{ForkID: forkid.NewID(eth.blockchain.Config(), eth.blockchain.Genesis().Hash(),
- eth.blockchain.CurrentHeader().Number.Uint64())}
- }
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