Official Go implementation of the Ethereum protocol
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go-ethereum/internal/shutdowncheck/shutdown_tracker.go

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2.6 KiB

// Copyright 2021 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 shutdowncheck
import (
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
)
// ShutdownTracker is a service that reports previous unclean shutdowns
// upon start. It needs to be started after a successful start-up and stopped
// after a successful shutdown, just before the db is closed.
type ShutdownTracker struct {
db ethdb.Database
stopCh chan struct{}
}
// NewShutdownTracker creates a new ShutdownTracker instance and has
// no other side-effect.
func NewShutdownTracker(db ethdb.Database) *ShutdownTracker {
return &ShutdownTracker{
db: db,
stopCh: make(chan struct{}),
}
}
// MarkStartup is to be called in the beginning when the node starts. It will:
// - Push a new startup marker to the db
// - Report previous unclean shutdowns
func (t *ShutdownTracker) MarkStartup() {
if uncleanShutdowns, discards, err := rawdb.PushUncleanShutdownMarker(t.db); err != nil {
log.Error("Could not update unclean-shutdown-marker list", "error", err)
} else {
if discards > 0 {
log.Warn("Old unclean shutdowns found", "count", discards)
}
for _, tstamp := range uncleanShutdowns {
t := time.Unix(int64(tstamp), 0)
log.Warn("Unclean shutdown detected", "booted", t,
"age", common.PrettyAge(t))
}
}
}
// Start runs an event loop that updates the current marker's timestamp every 5 minutes.
func (t *ShutdownTracker) Start() {
go func() {
ticker := time.NewTicker(5 * time.Minute)
defer ticker.Stop()
for {
select {
case <-ticker.C:
rawdb.UpdateUncleanShutdownMarker(t.db)
case <-t.stopCh:
return
}
}
}()
}
// Stop will stop the update loop and clear the current marker.
func (t *ShutdownTracker) Stop() {
// Stop update loop.
t.stopCh <- struct{}{}
// Clear last marker.
rawdb.PopUncleanShutdownMarker(t.db)
}