A fork of Gitea (see branch `mj`) adding Majority Judgment Polls 𐄷 over Issues and Merge Requests. https://git.mieuxvoter.fr
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// Copyright 2020 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"
"sync"
"time"
"code.gitea.io/gitea/modules/log"
)
// PersistableChannelUniqueQueueType is the type for persistable queue
const PersistableChannelUniqueQueueType Type = "unique-persistable-channel"
// PersistableChannelUniqueQueueConfiguration is the configuration for a PersistableChannelUniqueQueue
type PersistableChannelUniqueQueueConfiguration 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
}
// PersistableChannelUniqueQueue wraps a channel queue and level queue together
//
// Please note that this Queue does not guarantee that a particular
// task cannot be processed twice or more at the same time. Uniqueness is
// only guaranteed whilst the task is waiting in the queue.
type PersistableChannelUniqueQueue struct {
*ChannelUniqueQueue
delayedStarter
lock sync.Mutex
closed chan struct{}
}
// NewPersistableChannelUniqueQueue 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 NewPersistableChannelUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
configInterface, err := toConfig(PersistableChannelUniqueQueueConfiguration{}, cfg)
if err != nil {
return nil, err
}
config := configInterface.(PersistableChannelUniqueQueueConfiguration)
channelUniqueQueue, err := NewChannelUniqueQueue(handle, ChannelUniqueQueueConfiguration{
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 := LevelUniqueQueueConfiguration{
ByteFIFOQueueConfiguration: ByteFIFOQueueConfiguration{
WorkerPoolConfiguration: WorkerPoolConfiguration{
QueueLength: config.QueueLength,
BatchLength: config.BatchLength,
BlockTimeout: 0,
BoostTimeout: 0,
BoostWorkers: 0,
MaxWorkers: 1,
},
Workers: 1,
Name: config.Name + "-level",
},
DataDir: config.DataDir,
}
queue := &PersistableChannelUniqueQueue{
ChannelUniqueQueue: channelUniqueQueue.(*ChannelUniqueQueue),
closed: make(chan struct{}),
}
levelQueue, err := NewLevelUniqueQueue(func(data ...Data) {
for _, datum := range data {
err := queue.Push(datum)
if err != nil && err != ErrAlreadyInQueue {
log.Error("Unable push to channelled queue: %v", err)
}
}
}, levelCfg, exemplar)
if err == nil {
queue.delayedStarter = delayedStarter{
internal: levelQueue.(*LevelUniqueQueue),
name: config.Name,
}
_ = GetManager().Add(queue, PersistableChannelUniqueQueueType, config, exemplar)
return queue, nil
}
if IsErrInvalidConfiguration(err) {
// Retrying ain't gonna make this any better...
return nil, ErrInvalidConfiguration{cfg: cfg}
}
queue.delayedStarter = delayedStarter{
cfg: levelCfg,
underlying: LevelUniqueQueueType,
timeout: config.Timeout,
maxAttempts: config.MaxAttempts,
name: config.Name,
}
_ = GetManager().Add(queue, PersistableChannelUniqueQueueType, config, exemplar)
return queue, nil
}
// Name returns the name of this queue
func (q *PersistableChannelUniqueQueue) Name() string {
return q.delayedStarter.name
}
// Push will push the indexer data to queue
func (q *PersistableChannelUniqueQueue) Push(data Data) error {
return q.PushFunc(data, nil)
}
// PushFunc will push the indexer data to queue
func (q *PersistableChannelUniqueQueue) PushFunc(data Data, fn func() error) error {
select {
case <-q.closed:
return q.internal.(UniqueQueue).PushFunc(data, fn)
default:
return q.ChannelUniqueQueue.PushFunc(data, fn)
}
}
// Has will test if the queue has the data
func (q *PersistableChannelUniqueQueue) Has(data Data) (bool, error) {
// This is more difficult...
has, err := q.ChannelUniqueQueue.Has(data)
if err != nil || has {
return has, err
}
q.lock.Lock()
defer q.lock.Unlock()
if q.internal == nil {
return false, nil
}
return q.internal.(UniqueQueue).Has(data)
}
// Run starts to run the queue
func (q *PersistableChannelUniqueQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
log.Debug("PersistableChannelUniqueQueue: %s Starting", q.delayedStarter.name)
q.lock.Lock()
if q.internal == nil {
err := q.setInternal(atShutdown, func(data ...Data) {
for _, datum := range data {
err := q.Push(datum)
if err != nil && err != ErrAlreadyInQueue {
log.Error("Unable push to channelled queue: %v", err)
}
}
}, q.exemplar)
q.lock.Unlock()
if err != nil {
log.Fatal("Unable to create internal queue for %s Error: %v", q.Name(), err)
return
}
} else {
q.lock.Unlock()
}
atShutdown(context.Background(), q.Shutdown)
atTerminate(context.Background(), q.Terminate)
// Just run the level queue - we shut it down later
go q.internal.Run(func(_ context.Context, _ func()) {}, func(_ context.Context, _ func()) {})
go func() {
_ = q.ChannelUniqueQueue.AddWorkers(q.workers, 0)
}()
log.Trace("PersistableChannelUniqueQueue: %s Waiting til closed", q.delayedStarter.name)
<-q.closed
log.Trace("PersistableChannelUniqueQueue: %s Cancelling pools", q.delayedStarter.name)
q.internal.(*LevelUniqueQueue).cancel()
q.ChannelUniqueQueue.cancel()
log.Trace("PersistableChannelUniqueQueue: %s Waiting til done", q.delayedStarter.name)
q.ChannelUniqueQueue.Wait()
q.internal.(*LevelUniqueQueue).Wait()
// Redirect all remaining data in the chan to the internal channel
go func() {
log.Trace("PersistableChannelUniqueQueue: %s Redirecting remaining data", q.delayedStarter.name)
for data := range q.ChannelUniqueQueue.dataChan {
_ = q.internal.Push(data)
}
log.Trace("PersistableChannelUniqueQueue: %s Done Redirecting remaining data", q.delayedStarter.name)
}()
log.Trace("PersistableChannelUniqueQueue: %s Done main loop", q.delayedStarter.name)
}
// Flush flushes the queue
func (q *PersistableChannelUniqueQueue) Flush(timeout time.Duration) error {
return q.ChannelUniqueQueue.Flush(timeout)
}
// Shutdown processing this queue
func (q *PersistableChannelUniqueQueue) Shutdown() {
log.Trace("PersistableChannelUniqueQueue: %s Shutting down", q.delayedStarter.name)
q.lock.Lock()
defer q.lock.Unlock()
select {
case <-q.closed:
default:
if q.internal != nil {
q.internal.(*LevelUniqueQueue).Shutdown()
}
close(q.closed)
}
log.Debug("PersistableChannelUniqueQueue: %s Shutdown", q.delayedStarter.name)
}
// Terminate this queue and close the queue
func (q *PersistableChannelUniqueQueue) Terminate() {
log.Trace("PersistableChannelUniqueQueue: %s Terminating", q.delayedStarter.name)
q.Shutdown()
q.lock.Lock()
defer q.lock.Unlock()
if q.internal != nil {
q.internal.(*LevelUniqueQueue).Terminate()
}
log.Debug("PersistableChannelUniqueQueue: %s Terminated", q.delayedStarter.name)
}
func init() {
queuesMap[PersistableChannelUniqueQueueType] = NewPersistableChannelUniqueQueue
}