111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
// Copyright 2021 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 consensus
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import (
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"fmt"
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"sync"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/rlp"
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)
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// transitionStatus describes the status of eth1/2 transition. This switch
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// between modes is a one-way action which is triggered by corresponding
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// consensus-layer message.
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type transitionStatus struct {
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LeftPoW bool // The flag is set when the first NewHead message received
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EnteredPoS bool // The flag is set when the first FinalisedBlock message received
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}
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// Merger is an internal help structure used to track the eth1/2 transition status.
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// It's a common structure can be used in both full node and light client.
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type Merger struct {
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db ethdb.KeyValueStore
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status transitionStatus
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mu sync.RWMutex
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}
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// NewMerger creates a new Merger which stores its transition status in the provided db.
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func NewMerger(db ethdb.KeyValueStore) *Merger {
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var status transitionStatus
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blob := rawdb.ReadTransitionStatus(db)
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if len(blob) != 0 {
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if err := rlp.DecodeBytes(blob, &status); err != nil {
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log.Crit("Failed to decode the transition status", "err", err)
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}
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}
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return &Merger{
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db: db,
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status: status,
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}
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}
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// ReachTTD is called whenever the first NewHead message received
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// from the consensus-layer.
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func (m *Merger) ReachTTD() {
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m.mu.Lock()
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defer m.mu.Unlock()
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if m.status.LeftPoW {
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return
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}
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m.status = transitionStatus{LeftPoW: true}
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blob, err := rlp.EncodeToBytes(m.status)
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if err != nil {
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panic(fmt.Sprintf("Failed to encode the transition status: %v", err))
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}
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rawdb.WriteTransitionStatus(m.db, blob)
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log.Info("Left PoW stage")
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}
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// FinalizePoS is called whenever the first FinalisedBlock message received
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// from the consensus-layer.
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func (m *Merger) FinalizePoS() {
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m.mu.Lock()
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defer m.mu.Unlock()
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if m.status.EnteredPoS {
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return
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}
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m.status = transitionStatus{LeftPoW: true, EnteredPoS: true}
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blob, err := rlp.EncodeToBytes(m.status)
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if err != nil {
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panic(fmt.Sprintf("Failed to encode the transition status: %v", err))
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}
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rawdb.WriteTransitionStatus(m.db, blob)
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log.Info("Entered PoS stage")
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}
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// TDDReached reports whether the chain has left the PoW stage.
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func (m *Merger) TDDReached() bool {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.status.LeftPoW
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}
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// PoSFinalized reports whether the chain has entered the PoS stage.
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func (m *Merger) PoSFinalized() bool {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.status.EnteredPoS
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}
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