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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"
"reflect"
"sync"
"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 {
DataDir string
QueueLength int
BatchLength int
Workers int
MaxWorkers int
BlockTimeout time.Duration
BoostTimeout time.Duration
BoostWorkers int
Name string
}
// LevelQueue implements a disk library queue
type LevelQueue struct {
pool *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
}
dataChan := make(chan Data, config.QueueLength)
ctx, cancel := context.WithCancel(context.Background())
queue := &LevelQueue{
pool: &WorkerPool{
baseCtx: ctx,
cancel: cancel,
batchLength: config.BatchLength,
handle: handle,
dataChan: dataChan,
blockTimeout: config.BlockTimeout,
boostTimeout: config.BoostTimeout,
boostWorkers: config.BoostWorkers,
maxNumberOfWorkers: config.MaxWorkers,
},
queue: internal,
exemplar: exemplar,
closed: make(chan struct{}),
terminated: make(chan struct{}),
workers: config.Workers,
name: config.Name,
}
queue.pool.qid = GetManager().Add(queue, LevelQueueType, config, exemplar, queue.pool)
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)
go func() {
_ = l.pool.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.pool.Wait()
log.Trace("LevelQueue: %s Waiting til cleaned", l.name)
ctx, cancel := context.WithCancel(context.Background())
atTerminate(ctx, cancel)
l.pool.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.pool.cancel()
return
default:
bs, err := l.queue.RPop()
if err != nil {
if err != levelqueue.ErrNotFound {
log.Error("LevelQueue: %s Error on RPop: %v", l.name, err)
}
time.Sleep(time.Millisecond * 100)
continue
}
if len(bs) == 0 {
time.Sleep(time.Millisecond * 100)
continue
}
var data Data
if l.exemplar != nil {
t := reflect.TypeOf(l.exemplar)
n := reflect.New(t)
ne := n.Elem()
err = json.Unmarshal(bs, ne.Addr().Interface())
data = ne.Interface().(Data)
} else {
err = json.Unmarshal(bs, &data)
}
if err != nil {
log.Error("LevelQueue: %s Failed to unmarshal with error: %v", l.name, err)
time.Sleep(time.Millisecond * 100)
continue
}
log.Trace("LevelQueue %s: Task found: %#v", l.name, data)
l.pool.Push(data)
}
}
}
// Push will push the indexer data to queue
func (l *LevelQueue) Push(data Data) error {
if l.exemplar != nil {
// Assert data is of same type as r.exemplar
value := reflect.ValueOf(data)
t := value.Type()
exemplarType := reflect.ValueOf(l.exemplar).Type()
if !t.AssignableTo(exemplarType) || data == nil {
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)
}
// Shutdown this queue and stop processing
func (l *LevelQueue) Shutdown() {
l.lock.Lock()
defer l.lock.Unlock()
log.Trace("LevelQueue: %s Shutdown", l.name)
select {
case <-l.closed:
default:
close(l.closed)
}
}
// 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 err := l.queue.Close(); err != nil && err.Error() != "leveldb: closed" {
log.Error("Error whilst closing internal queue in %s: %v", l.name, err)
}
}
}
// Name returns the name of this queue
func (l *LevelQueue) Name() string {
return l.name
}
func init() {
queuesMap[LevelQueueType] = NewLevelQueue
}
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