405 lines
11 KiB
Go
405 lines
11 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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"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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// WorkerPool represent a dynamically growable worker pool for a
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// provided handler function. They have an internal channel which
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// they use to detect if there is a block and will grow and shrink in
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// response to demand as per configuration.
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type WorkerPool struct {
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lock sync.Mutex
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baseCtx context.Context
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cancel context.CancelFunc
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cond *sync.Cond
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qid int64
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maxNumberOfWorkers int
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numberOfWorkers int
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batchLength int
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handle HandlerFunc
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dataChan chan Data
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blockTimeout time.Duration
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boostTimeout time.Duration
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boostWorkers int
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numInQueue int64
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}
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// WorkerPoolConfiguration is the basic configuration for a WorkerPool
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type WorkerPoolConfiguration struct {
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QueueLength int
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BatchLength 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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MaxWorkers int
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}
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// NewWorkerPool creates a new worker pool
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func NewWorkerPool(handle HandlerFunc, config WorkerPoolConfiguration) *WorkerPool {
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ctx, cancel := context.WithCancel(context.Background())
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dataChan := make(chan Data, config.QueueLength)
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pool := &WorkerPool{
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baseCtx: ctx,
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cancel: cancel,
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batchLength: config.BatchLength,
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dataChan: dataChan,
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handle: handle,
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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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maxNumberOfWorkers: config.MaxWorkers,
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}
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return pool
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}
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// Push pushes the data to the internal channel
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func (p *WorkerPool) Push(data Data) {
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atomic.AddInt64(&p.numInQueue, 1)
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p.lock.Lock()
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if p.blockTimeout > 0 && p.boostTimeout > 0 && (p.numberOfWorkers <= p.maxNumberOfWorkers || p.maxNumberOfWorkers < 0) {
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p.lock.Unlock()
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p.pushBoost(data)
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} else {
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p.lock.Unlock()
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p.dataChan <- data
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}
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}
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func (p *WorkerPool) pushBoost(data Data) {
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select {
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case p.dataChan <- data:
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default:
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p.lock.Lock()
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if p.blockTimeout <= 0 {
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p.lock.Unlock()
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p.dataChan <- data
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return
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}
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ourTimeout := p.blockTimeout
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timer := time.NewTimer(p.blockTimeout)
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p.lock.Unlock()
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select {
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case p.dataChan <- data:
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if timer.Stop() {
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select {
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case <-timer.C:
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default:
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}
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}
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case <-timer.C:
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p.lock.Lock()
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if p.blockTimeout > ourTimeout || (p.numberOfWorkers > p.maxNumberOfWorkers && p.maxNumberOfWorkers >= 0) {
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p.lock.Unlock()
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p.dataChan <- data
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return
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}
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p.blockTimeout *= 2
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ctx, cancel := context.WithCancel(p.baseCtx)
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mq := GetManager().GetManagedQueue(p.qid)
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boost := p.boostWorkers
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if (boost+p.numberOfWorkers) > p.maxNumberOfWorkers && p.maxNumberOfWorkers >= 0 {
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boost = p.maxNumberOfWorkers - p.numberOfWorkers
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}
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if mq != nil {
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log.Warn("WorkerPool: %d (for %s) Channel blocked for %v - adding %d temporary workers for %s, block timeout now %v", p.qid, mq.Name, ourTimeout, boost, p.boostTimeout, p.blockTimeout)
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start := time.Now()
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pid := mq.RegisterWorkers(boost, start, false, start, cancel, false)
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go func() {
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<-ctx.Done()
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mq.RemoveWorkers(pid)
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cancel()
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}()
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} else {
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log.Warn("WorkerPool: %d Channel blocked for %v - adding %d temporary workers for %s, block timeout now %v", p.qid, ourTimeout, p.boostWorkers, p.boostTimeout, p.blockTimeout)
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}
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go func() {
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<-time.After(p.boostTimeout)
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cancel()
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p.lock.Lock()
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p.blockTimeout /= 2
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p.lock.Unlock()
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}()
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p.lock.Unlock()
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p.addWorkers(ctx, boost)
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p.dataChan <- data
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}
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}
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}
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// NumberOfWorkers returns the number of current workers in the pool
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func (p *WorkerPool) NumberOfWorkers() int {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.numberOfWorkers
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}
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// MaxNumberOfWorkers returns the maximum number of workers automatically added to the pool
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func (p *WorkerPool) MaxNumberOfWorkers() int {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.maxNumberOfWorkers
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}
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// BoostWorkers returns the number of workers for a boost
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func (p *WorkerPool) BoostWorkers() int {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.boostWorkers
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}
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// BoostTimeout returns the timeout of the next boost
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func (p *WorkerPool) BoostTimeout() time.Duration {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.boostTimeout
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}
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// BlockTimeout returns the timeout til the next boost
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func (p *WorkerPool) BlockTimeout() time.Duration {
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p.lock.Lock()
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defer p.lock.Unlock()
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return p.blockTimeout
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}
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// SetPoolSettings sets the setable boost values
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func (p *WorkerPool) SetPoolSettings(maxNumberOfWorkers, boostWorkers int, timeout time.Duration) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.maxNumberOfWorkers = maxNumberOfWorkers
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p.boostWorkers = boostWorkers
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p.boostTimeout = timeout
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}
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// SetMaxNumberOfWorkers sets the maximum number of workers automatically added to the pool
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// Changing this number will not change the number of current workers but will change the limit
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// for future additions
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func (p *WorkerPool) SetMaxNumberOfWorkers(newMax int) {
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p.lock.Lock()
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defer p.lock.Unlock()
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p.maxNumberOfWorkers = newMax
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}
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func (p *WorkerPool) commonRegisterWorkers(number int, timeout time.Duration, isFlusher bool) (context.Context, context.CancelFunc) {
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var ctx context.Context
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var cancel context.CancelFunc
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start := time.Now()
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end := start
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hasTimeout := false
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if timeout > 0 {
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ctx, cancel = context.WithTimeout(p.baseCtx, timeout)
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end = start.Add(timeout)
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hasTimeout = true
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} else {
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ctx, cancel = context.WithCancel(p.baseCtx)
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}
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mq := GetManager().GetManagedQueue(p.qid)
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if mq != nil {
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pid := mq.RegisterWorkers(number, start, hasTimeout, end, cancel, isFlusher)
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go func() {
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<-ctx.Done()
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mq.RemoveWorkers(pid)
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cancel()
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}()
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log.Trace("WorkerPool: %d (for %s) adding %d workers with group id: %d", p.qid, mq.Name, number, pid)
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} else {
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log.Trace("WorkerPool: %d adding %d workers (no group id)", p.qid, number)
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}
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return ctx, cancel
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}
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// AddWorkers adds workers to the pool - this allows the number of workers to go above the limit
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func (p *WorkerPool) AddWorkers(number int, timeout time.Duration) context.CancelFunc {
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ctx, cancel := p.commonRegisterWorkers(number, timeout, false)
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p.addWorkers(ctx, number)
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return cancel
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}
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// addWorkers adds workers to the pool
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func (p *WorkerPool) addWorkers(ctx context.Context, number int) {
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for i := 0; i < number; i++ {
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p.lock.Lock()
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if p.cond == nil {
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p.cond = sync.NewCond(&p.lock)
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}
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p.numberOfWorkers++
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p.lock.Unlock()
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go func() {
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p.doWork(ctx)
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p.lock.Lock()
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p.numberOfWorkers--
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if p.numberOfWorkers == 0 {
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p.cond.Broadcast()
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} else if p.numberOfWorkers < 0 {
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// numberOfWorkers can't go negative but...
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log.Warn("Number of Workers < 0 for QID %d - this shouldn't happen", p.qid)
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p.numberOfWorkers = 0
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p.cond.Broadcast()
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}
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p.lock.Unlock()
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}()
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}
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}
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// Wait for WorkerPool to finish
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func (p *WorkerPool) Wait() {
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p.lock.Lock()
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defer p.lock.Unlock()
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if p.cond == nil {
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p.cond = sync.NewCond(&p.lock)
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}
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if p.numberOfWorkers <= 0 {
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return
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}
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p.cond.Wait()
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}
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// CleanUp will drain the remaining contents of the channel
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// This should be called after AddWorkers context is closed
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func (p *WorkerPool) CleanUp(ctx context.Context) {
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log.Trace("WorkerPool: %d CleanUp", p.qid)
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close(p.dataChan)
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for data := range p.dataChan {
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p.handle(data)
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atomic.AddInt64(&p.numInQueue, -1)
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select {
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case <-ctx.Done():
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log.Warn("WorkerPool: %d Cleanup context closed before finishing clean-up", p.qid)
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return
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default:
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}
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}
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log.Trace("WorkerPool: %d CleanUp Done", p.qid)
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}
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// Flush flushes the channel with a timeout - the Flush worker will be registered as a flush worker with the manager
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func (p *WorkerPool) Flush(timeout time.Duration) error {
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ctx, cancel := p.commonRegisterWorkers(1, timeout, true)
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defer cancel()
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return p.FlushWithContext(ctx)
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}
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// IsEmpty returns if true if the worker queue is empty
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func (p *WorkerPool) IsEmpty() bool {
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return atomic.LoadInt64(&p.numInQueue) == 0
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}
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// FlushWithContext is very similar to CleanUp but it will return as soon as the dataChan is empty
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// NB: The worker will not be registered with the manager.
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func (p *WorkerPool) FlushWithContext(ctx context.Context) error {
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log.Trace("WorkerPool: %d Flush", p.qid)
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for {
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select {
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case data := <-p.dataChan:
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p.handle(data)
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atomic.AddInt64(&p.numInQueue, -1)
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case <-p.baseCtx.Done():
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return p.baseCtx.Err()
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case <-ctx.Done():
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return ctx.Err()
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default:
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return nil
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}
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}
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}
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func (p *WorkerPool) doWork(ctx context.Context) {
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delay := time.Millisecond * 300
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var data = make([]Data, 0, p.batchLength)
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for {
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select {
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case <-ctx.Done():
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if len(data) > 0 {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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}
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log.Trace("Worker shutting down")
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return
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case datum, ok := <-p.dataChan:
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if !ok {
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// the dataChan has been closed - we should finish up:
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if len(data) > 0 {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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}
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log.Trace("Worker shutting down")
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return
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}
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data = append(data, datum)
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if len(data) >= p.batchLength {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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data = make([]Data, 0, p.batchLength)
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}
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default:
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timer := time.NewTimer(delay)
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select {
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case <-ctx.Done():
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if timer.Stop() {
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select {
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case <-timer.C:
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default:
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}
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}
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if len(data) > 0 {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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}
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log.Trace("Worker shutting down")
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return
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case datum, ok := <-p.dataChan:
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if timer.Stop() {
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select {
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case <-timer.C:
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default:
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}
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}
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if !ok {
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// the dataChan has been closed - we should finish up:
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if len(data) > 0 {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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}
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log.Trace("Worker shutting down")
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return
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}
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data = append(data, datum)
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if len(data) >= p.batchLength {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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data = make([]Data, 0, p.batchLength)
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}
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case <-timer.C:
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delay = time.Millisecond * 100
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if len(data) > 0 {
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log.Trace("Handling: %d data, %v", len(data), data)
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p.handle(data...)
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atomic.AddInt64(&p.numInQueue, -1*int64(len(data)))
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data = make([]Data, 0, p.batchLength)
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}
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}
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}
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}
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}
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