mirror of
https://github.com/hibiken/asynq.git
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114 lines
3.0 KiB
Go
114 lines
3.0 KiB
Go
// Copyright 2020 Kentaro Hibino. All rights reserved.
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// Use of this source code is governed by a MIT license
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// that can be found in the LICENSE file.
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package asynq
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import (
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"context"
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"sync"
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"time"
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"github.com/hibiken/asynq/internal/base"
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"github.com/hibiken/asynq/internal/errors"
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"github.com/hibiken/asynq/internal/log"
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)
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type recoverer struct {
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logger *log.Logger
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broker base.Broker
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retryDelayFunc RetryDelayFunc
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isFailureFunc func(error) bool
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// channel to communicate back to the long running "recoverer" goroutine.
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done chan struct{}
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// list of queues to check for deadline.
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queues []string
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// poll interval.
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interval time.Duration
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}
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type recovererParams struct {
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logger *log.Logger
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broker base.Broker
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queues []string
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interval time.Duration
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retryDelayFunc RetryDelayFunc
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isFailureFunc func(error) bool
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}
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func newRecoverer(params recovererParams) *recoverer {
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return &recoverer{
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logger: params.logger,
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broker: params.broker,
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done: make(chan struct{}),
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queues: params.queues,
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interval: params.interval,
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retryDelayFunc: params.retryDelayFunc,
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isFailureFunc: params.isFailureFunc,
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}
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}
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func (r *recoverer) shutdown() {
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r.logger.Debug("Recoverer shutting down...")
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// Signal the recoverer goroutine to stop polling.
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r.done <- struct{}{}
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}
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func (r *recoverer) start(wg *sync.WaitGroup) {
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wg.Add(1)
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go func() {
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defer wg.Done()
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r.recover()
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timer := time.NewTimer(r.interval)
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for {
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select {
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case <-r.done:
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r.logger.Debug("Recoverer done")
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timer.Stop()
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return
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case <-timer.C:
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r.recover()
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timer.Reset(r.interval)
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}
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}
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}()
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}
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// ErrLeaseExpired error indicates that the task failed because the worker working on the task
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// could not extend its lease due to missing heartbeats. The worker may have crashed or got cutoff from the network.
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var ErrLeaseExpired = errors.New("asynq: task lease expired")
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func (r *recoverer) recover() {
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// Get all tasks which have expired 30 seconds ago or earlier to accomodate certain amount of clock skew.
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cutoff := time.Now().Add(-30 * time.Second)
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msgs, err := r.broker.ListLeaseExpired(cutoff, r.queues...)
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if err != nil {
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r.logger.Warn("recoverer: could not list lease expired tasks")
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return
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}
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for _, msg := range msgs {
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if msg.Retried >= msg.Retry {
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r.archive(msg, ErrLeaseExpired)
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} else {
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r.retry(msg, ErrLeaseExpired)
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}
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}
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}
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func (r *recoverer) retry(msg *base.TaskMessage, err error) {
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delay := r.retryDelayFunc(msg.Retried, err, NewTask(msg.Type, msg.Payload))
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retryAt := time.Now().Add(delay)
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if err := r.broker.Retry(context.Background(), msg, retryAt, err.Error(), r.isFailureFunc(err)); err != nil {
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r.logger.Warnf("recoverer: could not retry lease expired task: %v", err)
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}
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}
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func (r *recoverer) archive(msg *base.TaskMessage, err error) {
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if err := r.broker.Archive(context.Background(), msg, err.Error()); err != nil {
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r.logger.Warnf("recoverer: could not move task to archive: %v", err)
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}
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}
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