mirror of
https://github.com/go-gitea/gitea
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2c903383b5
* Upgrade levelqueue to version 0.2.0 This adds functionality for Unique Queues * Add UniqueQueue interface and functions to create them * Add UniqueQueue implementations * Move TestPullRequests over to use UniqueQueue * Reduce code duplication * Add bytefifos * Ensure invalid types are logged * Fix close race in PersistableChannelQueue Shutdown
261 lines
7.5 KiB
Go
261 lines
7.5 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package queue
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import (
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"context"
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"fmt"
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"sync"
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"sync/atomic"
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"time"
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"code.gitea.io/gitea/modules/log"
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)
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// PersistableChannelQueueType is the type for persistable queue
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const PersistableChannelQueueType Type = "persistable-channel"
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// PersistableChannelQueueConfiguration is the configuration for a PersistableChannelQueue
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type PersistableChannelQueueConfiguration struct {
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Name string
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DataDir string
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BatchLength int
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QueueLength int
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Timeout time.Duration
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MaxAttempts int
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Workers int
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MaxWorkers int
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BlockTimeout time.Duration
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BoostTimeout time.Duration
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BoostWorkers int
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}
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// PersistableChannelQueue wraps a channel queue and level queue together
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// The disk level queue will be used to store data at shutdown and terminate - and will be restored
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// on start up.
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type PersistableChannelQueue struct {
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channelQueue *ChannelQueue
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delayedStarter
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lock sync.Mutex
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closed chan struct{}
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}
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// NewPersistableChannelQueue creates a wrapped batched channel queue with persistable level queue backend when shutting down
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// This differs from a wrapped queue in that the persistent queue is only used to persist at shutdown/terminate
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func NewPersistableChannelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
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configInterface, err := toConfig(PersistableChannelQueueConfiguration{}, cfg)
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if err != nil {
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return nil, err
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}
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config := configInterface.(PersistableChannelQueueConfiguration)
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channelQueue, err := NewChannelQueue(handle, ChannelQueueConfiguration{
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WorkerPoolConfiguration: WorkerPoolConfiguration{
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QueueLength: config.QueueLength,
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BatchLength: config.BatchLength,
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BlockTimeout: config.BlockTimeout,
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BoostTimeout: config.BoostTimeout,
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BoostWorkers: config.BoostWorkers,
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MaxWorkers: config.MaxWorkers,
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},
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Workers: config.Workers,
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Name: config.Name + "-channel",
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}, exemplar)
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if err != nil {
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return nil, err
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}
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// the level backend only needs temporary workers to catch up with the previously dropped work
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levelCfg := LevelQueueConfiguration{
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ByteFIFOQueueConfiguration: ByteFIFOQueueConfiguration{
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WorkerPoolConfiguration: WorkerPoolConfiguration{
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QueueLength: config.QueueLength,
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BatchLength: config.BatchLength,
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BlockTimeout: 1 * time.Second,
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BoostTimeout: 5 * time.Minute,
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BoostWorkers: 5,
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MaxWorkers: 6,
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},
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Workers: 1,
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Name: config.Name + "-level",
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},
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DataDir: config.DataDir,
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}
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levelQueue, err := NewLevelQueue(handle, levelCfg, exemplar)
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if err == nil {
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queue := &PersistableChannelQueue{
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channelQueue: channelQueue.(*ChannelQueue),
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delayedStarter: delayedStarter{
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internal: levelQueue.(*LevelQueue),
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name: config.Name,
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},
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closed: make(chan struct{}),
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}
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_ = GetManager().Add(queue, PersistableChannelQueueType, config, exemplar)
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return queue, nil
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}
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if IsErrInvalidConfiguration(err) {
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// Retrying ain't gonna make this any better...
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return nil, ErrInvalidConfiguration{cfg: cfg}
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}
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queue := &PersistableChannelQueue{
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channelQueue: channelQueue.(*ChannelQueue),
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delayedStarter: delayedStarter{
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cfg: levelCfg,
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underlying: LevelQueueType,
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timeout: config.Timeout,
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maxAttempts: config.MaxAttempts,
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name: config.Name,
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},
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closed: make(chan struct{}),
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}
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_ = GetManager().Add(queue, PersistableChannelQueueType, config, exemplar)
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return queue, nil
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}
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// Name returns the name of this queue
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func (q *PersistableChannelQueue) Name() string {
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return q.delayedStarter.name
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}
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// Push will push the indexer data to queue
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func (q *PersistableChannelQueue) Push(data Data) error {
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select {
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case <-q.closed:
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return q.internal.Push(data)
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default:
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return q.channelQueue.Push(data)
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}
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}
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// Run starts to run the queue
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func (q *PersistableChannelQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
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log.Debug("PersistableChannelQueue: %s Starting", q.delayedStarter.name)
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q.lock.Lock()
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if q.internal == nil {
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err := q.setInternal(atShutdown, q.channelQueue.handle, q.channelQueue.exemplar)
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q.lock.Unlock()
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if err != nil {
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log.Fatal("Unable to create internal queue for %s Error: %v", q.Name(), err)
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return
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}
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} else {
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q.lock.Unlock()
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}
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atShutdown(context.Background(), q.Shutdown)
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atTerminate(context.Background(), q.Terminate)
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// Just run the level queue - we shut it down later
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go q.internal.Run(func(_ context.Context, _ func()) {}, func(_ context.Context, _ func()) {})
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go func() {
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_ = q.channelQueue.AddWorkers(q.channelQueue.workers, 0)
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}()
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log.Trace("PersistableChannelQueue: %s Waiting til closed", q.delayedStarter.name)
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<-q.closed
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log.Trace("PersistableChannelQueue: %s Cancelling pools", q.delayedStarter.name)
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q.channelQueue.cancel()
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q.internal.(*LevelQueue).cancel()
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log.Trace("PersistableChannelQueue: %s Waiting til done", q.delayedStarter.name)
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q.channelQueue.Wait()
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q.internal.(*LevelQueue).Wait()
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// Redirect all remaining data in the chan to the internal channel
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go func() {
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log.Trace("PersistableChannelQueue: %s Redirecting remaining data", q.delayedStarter.name)
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for data := range q.channelQueue.dataChan {
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_ = q.internal.Push(data)
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atomic.AddInt64(&q.channelQueue.numInQueue, -1)
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}
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log.Trace("PersistableChannelQueue: %s Done Redirecting remaining data", q.delayedStarter.name)
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}()
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log.Trace("PersistableChannelQueue: %s Done main loop", q.delayedStarter.name)
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}
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// Flush flushes the queue and blocks till the queue is empty
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func (q *PersistableChannelQueue) Flush(timeout time.Duration) error {
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var ctx context.Context
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var cancel context.CancelFunc
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if timeout > 0 {
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ctx, cancel = context.WithTimeout(context.Background(), timeout)
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} else {
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ctx, cancel = context.WithCancel(context.Background())
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}
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defer cancel()
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return q.FlushWithContext(ctx)
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}
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// FlushWithContext flushes the queue and blocks till the queue is empty
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func (q *PersistableChannelQueue) FlushWithContext(ctx context.Context) error {
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errChan := make(chan error, 1)
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go func() {
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errChan <- q.channelQueue.FlushWithContext(ctx)
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}()
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go func() {
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q.lock.Lock()
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if q.internal == nil {
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q.lock.Unlock()
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errChan <- fmt.Errorf("not ready to flush internal queue %s yet", q.Name())
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return
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}
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q.lock.Unlock()
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errChan <- q.internal.FlushWithContext(ctx)
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}()
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err1 := <-errChan
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err2 := <-errChan
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if err1 != nil {
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return err1
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}
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return err2
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}
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// IsEmpty checks if a queue is empty
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func (q *PersistableChannelQueue) IsEmpty() bool {
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if !q.channelQueue.IsEmpty() {
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return false
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}
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q.lock.Lock()
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defer q.lock.Unlock()
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if q.internal == nil {
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return false
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}
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return q.internal.IsEmpty()
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}
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// Shutdown processing this queue
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func (q *PersistableChannelQueue) Shutdown() {
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log.Trace("PersistableChannelQueue: %s Shutting down", q.delayedStarter.name)
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q.lock.Lock()
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defer q.lock.Unlock()
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select {
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case <-q.closed:
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default:
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if q.internal != nil {
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q.internal.(*LevelQueue).Shutdown()
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}
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close(q.closed)
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log.Debug("PersistableChannelQueue: %s Shutdown", q.delayedStarter.name)
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}
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}
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// Terminate this queue and close the queue
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func (q *PersistableChannelQueue) Terminate() {
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log.Trace("PersistableChannelQueue: %s Terminating", q.delayedStarter.name)
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q.Shutdown()
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q.lock.Lock()
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defer q.lock.Unlock()
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if q.internal != nil {
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q.internal.(*LevelQueue).Terminate()
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}
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log.Debug("PersistableChannelQueue: %s Terminated", q.delayedStarter.name)
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}
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func init() {
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queuesMap[PersistableChannelQueueType] = NewPersistableChannelQueue
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}
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