983f92368b
* eth: chain config (genesis + fork) ENR entry * core/forkid, eth: protocol independent fork ID, update to CRC32 spec * core/forkid, eth: make forkid a struct, next uint64, enr struct, RLP * core/forkid: change forkhash rlp encoding from int to [4]byte * eth: fixup eth entry a bit and update it every block * eth: fix lint * eth: fix crash in ethclient tests
62 lines
1.8 KiB
Go
62 lines
1.8 KiB
Go
// Copyright 2019 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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// ethEntry is the "eth" ENR entry which advertises eth protocol
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// on the discovery network.
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type ethEntry 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 ethEntry) ENRKey() string {
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return "eth"
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}
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func (eth *Ethereum) startEthEntryUpdate(ln *enode.LocalNode) {
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var newHead = make(chan core.ChainHeadEvent, 10)
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sub := eth.blockchain.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(eth.currentEthEntry())
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case <-sub.Err():
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// Would be nice to sync with eth.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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func (eth *Ethereum) currentEthEntry() *ethEntry {
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return ðEntry{ForkID: forkid.NewID(eth.blockchain)}
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}
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