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- // 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"
- "encoding/json"
- "fmt"
- "sync"
- "sync/atomic"
- "time"
-
- "code.gitea.io/gitea/modules/log"
-
- "gitea.com/lunny/levelqueue"
- )
-
- // LevelQueueType is the type for level queue
- const LevelQueueType Type = "level"
-
- // LevelQueueConfiguration is the configuration for a LevelQueue
- type LevelQueueConfiguration struct {
- WorkerPoolConfiguration
- DataDir string
- Workers int
- Name string
- }
-
- // LevelQueue implements a disk library queue
- type LevelQueue struct {
- *WorkerPool
- queue *levelqueue.Queue
- closed chan struct{}
- terminated chan struct{}
- lock sync.Mutex
- exemplar interface{}
- workers int
- name string
- }
-
- // NewLevelQueue creates a ledis local queue
- func NewLevelQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
- configInterface, err := toConfig(LevelQueueConfiguration{}, cfg)
- if err != nil {
- return nil, err
- }
- config := configInterface.(LevelQueueConfiguration)
-
- internal, err := levelqueue.Open(config.DataDir)
- if err != nil {
- return nil, err
- }
-
- queue := &LevelQueue{
- WorkerPool: NewWorkerPool(handle, config.WorkerPoolConfiguration),
- queue: internal,
- exemplar: exemplar,
- closed: make(chan struct{}),
- terminated: make(chan struct{}),
- workers: config.Workers,
- name: config.Name,
- }
- queue.qid = GetManager().Add(queue, LevelQueueType, config, exemplar)
- return queue, nil
- }
-
- // Run starts to run the queue
- func (l *LevelQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
- atShutdown(context.Background(), l.Shutdown)
- atTerminate(context.Background(), l.Terminate)
- log.Debug("LevelQueue: %s Starting", l.name)
-
- go func() {
- _ = l.AddWorkers(l.workers, 0)
- }()
-
- go l.readToChan()
-
- log.Trace("LevelQueue: %s Waiting til closed", l.name)
- <-l.closed
-
- log.Trace("LevelQueue: %s Waiting til done", l.name)
- l.Wait()
-
- log.Trace("LevelQueue: %s Waiting til cleaned", l.name)
- ctx, cancel := context.WithCancel(context.Background())
- atTerminate(ctx, cancel)
- l.CleanUp(ctx)
- cancel()
- log.Trace("LevelQueue: %s Cleaned", l.name)
-
- }
-
- func (l *LevelQueue) readToChan() {
- for {
- select {
- case <-l.closed:
- // tell the pool to shutdown.
- l.cancel()
- return
- default:
- atomic.AddInt64(&l.numInQueue, 1)
- bs, err := l.queue.RPop()
- if err != nil {
- if err != levelqueue.ErrNotFound {
- log.Error("LevelQueue: %s Error on RPop: %v", l.name, err)
- }
- atomic.AddInt64(&l.numInQueue, -1)
- time.Sleep(time.Millisecond * 100)
- continue
- }
-
- if len(bs) == 0 {
- atomic.AddInt64(&l.numInQueue, -1)
- time.Sleep(time.Millisecond * 100)
- continue
- }
-
- data, err := unmarshalAs(bs, l.exemplar)
- if err != nil {
- log.Error("LevelQueue: %s Failed to unmarshal with error: %v", l.name, err)
- atomic.AddInt64(&l.numInQueue, -1)
- time.Sleep(time.Millisecond * 100)
- continue
- }
-
- log.Trace("LevelQueue %s: Task found: %#v", l.name, data)
- l.WorkerPool.Push(data)
- atomic.AddInt64(&l.numInQueue, -1)
- }
- }
- }
-
- // Push will push the indexer data to queue
- func (l *LevelQueue) Push(data Data) error {
- if !assignableTo(data, l.exemplar) {
- return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in %s", data, l.exemplar, l.name)
- }
- bs, err := json.Marshal(data)
- if err != nil {
- return err
- }
- return l.queue.LPush(bs)
- }
-
- // IsEmpty checks whether the queue is empty
- func (l *LevelQueue) IsEmpty() bool {
- if !l.WorkerPool.IsEmpty() {
- return false
- }
- return l.queue.Len() == 0
- }
-
- // Shutdown this queue and stop processing
- func (l *LevelQueue) Shutdown() {
- l.lock.Lock()
- defer l.lock.Unlock()
- log.Trace("LevelQueue: %s Shutting down", l.name)
- select {
- case <-l.closed:
- default:
- close(l.closed)
- }
- log.Debug("LevelQueue: %s Shutdown", l.name)
- }
-
- // Terminate this queue and close the queue
- func (l *LevelQueue) Terminate() {
- log.Trace("LevelQueue: %s Terminating", l.name)
- l.Shutdown()
- l.lock.Lock()
- select {
- case <-l.terminated:
- l.lock.Unlock()
- default:
- close(l.terminated)
- l.lock.Unlock()
- if log.IsDebug() {
- log.Debug("LevelQueue: %s Closing with %d tasks left in queue", l.name, l.queue.Len())
- }
- if err := l.queue.Close(); err != nil && err.Error() != "leveldb: closed" {
- log.Error("Error whilst closing internal queue in %s: %v", l.name, err)
- }
-
- }
- log.Debug("LevelQueue: %s Terminated", l.name)
- }
-
- // Name returns the name of this queue
- func (l *LevelQueue) Name() string {
- return l.name
- }
-
- func init() {
- queuesMap[LevelQueueType] = NewLevelQueue
- }
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