gitea/modules/queue/queue_disk_channel.go
zeripath c01221e70f
Queue: Make WorkerPools and Queues flushable (#10001)
* Make WorkerPools and Queues flushable

Adds Flush methods to Queues and the WorkerPool
Further abstracts the WorkerPool
Adds a final step to Flush the queues in the defer from PrintCurrentTest
Fixes an issue with Settings inheritance in queues

Signed-off-by: Andrew Thornton <art27@cantab.net>

* Change to for loop

* Add IsEmpty and begin just making the queues composed WorkerPools

* subsume workerpool into the queues and create a flushable interface

* Add manager command

* Move flushall to queue.Manager and add to testlogger

* As per @guillep2k

* as per @guillep2k

* Just make queues all implement flushable and clean up the wrapped queue flushes

* cope with no timeout

Co-authored-by: Lauris BH <lauris@nix.lv>
2020-01-28 20:01:06 -05:00

260 lines
7.4 KiB
Go

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