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57 lines
1.8 KiB
Go
57 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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"fmt"
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"github.com/ledgerwatch/erigon/common"
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"github.com/ledgerwatch/erigon/core/forkid"
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"github.com/ledgerwatch/erigon/p2p/enr"
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"github.com/ledgerwatch/erigon/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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// CurrentENREntryFromForks constructs an `eth` ENR entry based on the current state of the chain.
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func CurrentENREntryFromForks(forks []uint64, genesisHash common.Hash, headHeight uint64) *enrEntry {
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return &enrEntry{
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ForkID: forkid.NewIDFromForks(forks, genesisHash, headHeight),
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}
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}
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func LoadENRForkID(r *enr.Record) (*forkid.ID, error) {
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var entry enrEntry
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if err := r.Load(&entry); err != nil {
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if enr.IsNotFound(err) {
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return nil, nil
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}
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return nil, fmt.Errorf("failed to load fork ID from ENR: %w", err)
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}
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return &entry.ForkID, nil
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}
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