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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package main
import (
"context"
"fmt"
"sync"
"time"
"github.com/algorand/go-algorand/config"
"github.com/algorand/go-algorand/logging/telemetryspec"
"github.com/algorand/go-algorand/rpcs"
)
type deadManWatcher struct {
timeout time.Duration
newBlockChan chan uint64
uploadOnError bool
client Client
done <-chan struct{}
wg *sync.WaitGroup
algodConfig config.Local
}
func makeDeadManWatcher(timeout int64, client Client, uploadOnError bool, done <-chan struct{}, wg *sync.WaitGroup, algodConfig config.Local) deadManWatcher {
var deadManTime time.Duration
if timeout == 0 {
deadManTime = time.Hour * (10 * 365 * 24) // Don't fire for 10 years
} else {
deadManTime = time.Duration(timeout) * time.Second
}
return deadManWatcher{
timeout: deadManTime,
newBlockChan: make(chan uint64),
client: client,
uploadOnError: uploadOnError,
done: done,
wg: wg,
algodConfig: algodConfig,
}
}
func (w deadManWatcher) init(initBlock uint64) {
go w.run(initBlock)
}
func (w deadManWatcher) run(initBlock uint64) {
defer w.wg.Done()
latestBlock := initBlock
var deadManTimeout <-chan time.Time
for {
select {
case block := <-w.newBlockChan:
latestBlock = block
deadManTimeout = time.After(w.timeout)
case <-w.done:
return
case <-deadManTimeout:
deadManTimeout = nil // Don't detect deadlock again until after we see another block
err := w.reportDeadManTimeout(latestBlock)
// If err is not nil, algod failed to respond to goroutine request
// This is a critical failure - hopefully telemetry and logging will capture
// the details, but the best thing we can do is try to shut it down.
if err != nil {
nc := getNodeController()
nc.FullStop()
}
}
}
}
func (w deadManWatcher) onBlock(block rpcs.EncodedBlockCert) {
w.newBlockChan <- uint64(block.Block.BlockHeader.Round)
}
func (w deadManWatcher) reportDeadManTimeout(curBlock uint64) (err error) {
var details telemetryspec.DeadManTriggeredEventDetails
if w.algodConfig.EnableProfiler {
goRoutines, err := getGoRoutines(w.client)
if err != nil {
goRoutines = fmt.Sprintf("Error dumping goroutines: %v", err)
}
details = telemetryspec.DeadManTriggeredEventDetails{
Timeout: int64(w.timeout.Seconds()),
CurrentBlock: curBlock,
GoRoutines: goRoutines,
}
} else {
healthCheck, err := getHealthCheck(w.client)
if err != nil {
healthCheck = fmt.Sprintf("Error performing health check : %v", err)
}
details = telemetryspec.DeadManTriggeredEventDetails{
Timeout: int64(w.timeout.Seconds()),
CurrentBlock: curBlock,
GoRoutines: healthCheck,
}
}
log.EventWithDetails(telemetryspec.HostApplicationState, telemetryspec.DeadManTriggeredEvent, details)
if w.uploadOnError {
sendLogs()
}
return
}
func getGoRoutines(client Client) (goRoutines string, err error) {
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
goRoutines, err = client.GetGoRoutines(ctx)
if ctx.Err() == context.DeadlineExceeded {
err = fmt.Errorf("timed out requesting goroutines")
}
return
}
func getHealthCheck(client Client) (healthCheck string, err error) {
err = client.HealthCheck()
if err == nil {
healthCheck = "Node is healthy"
}
return
}
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