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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"
"errors"
"fmt"
"strings"
"sync"
"sync/atomic"
"time"
"code.gitea.io/gitea/modules/log"
"github.com/go-redis/redis"
)
// RedisQueueType is the type for redis queue
const RedisQueueType Type = "redis"
type redisClient interface {
RPush(key string, args ...interface{}) *redis.IntCmd
LPop(key string) *redis.StringCmd
LLen(key string) *redis.IntCmd
Ping() *redis.StatusCmd
Close() error
}
// RedisQueue redis queue
type RedisQueue struct {
*WorkerPool
client redisClient
queueName string
closed chan struct{}
terminated chan struct{}
exemplar interface{}
workers int
name string
lock sync.Mutex
}
// RedisQueueConfiguration is the configuration for the redis queue
type RedisQueueConfiguration struct {
WorkerPoolConfiguration
Network string
Addresses string
Password string
DBIndex int
QueueName string
Workers int
Name string
}
// NewRedisQueue creates single redis or cluster redis queue
func NewRedisQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
configInterface, err := toConfig(RedisQueueConfiguration{}, cfg)
if err != nil {
return nil, err
}
config := configInterface.(RedisQueueConfiguration)
dbs := strings.Split(config.Addresses, ",")
var queue = &RedisQueue{
WorkerPool: NewWorkerPool(handle, config.WorkerPoolConfiguration),
queueName: config.QueueName,
exemplar: exemplar,
closed: make(chan struct{}),
terminated: make(chan struct{}),
workers: config.Workers,
name: config.Name,
}
if len(dbs) == 0 {
return nil, errors.New("no redis host specified")
} else if len(dbs) == 1 {
queue.client = redis.NewClient(&redis.Options{
Network: config.Network,
Addr: strings.TrimSpace(dbs[0]), // use default Addr
Password: config.Password, // no password set
DB: config.DBIndex, // use default DB
})
} else {
queue.client = redis.NewClusterClient(&redis.ClusterOptions{
Addrs: dbs,
})
}
if err := queue.client.Ping().Err(); err != nil {
return nil, err
}
queue.qid = GetManager().Add(queue, RedisQueueType, config, exemplar)
return queue, nil
}
// Run runs the redis queue
func (r *RedisQueue) Run(atShutdown, atTerminate func(context.Context, func())) {
atShutdown(context.Background(), r.Shutdown)
atTerminate(context.Background(), r.Terminate)
log.Debug("RedisQueue: %s Starting", r.name)
go func() {
_ = r.AddWorkers(r.workers, 0)
}()
go r.readToChan()
log.Trace("RedisQueue: %s Waiting til closed", r.name)
<-r.closed
log.Trace("RedisQueue: %s Waiting til done", r.name)
r.Wait()
log.Trace("RedisQueue: %s Waiting til cleaned", r.name)
ctx, cancel := context.WithCancel(context.Background())
atTerminate(ctx, cancel)
r.CleanUp(ctx)
cancel()
}
func (r *RedisQueue) readToChan() {
for {
select {
case <-r.closed:
// tell the pool to shutdown
r.cancel()
return
default:
atomic.AddInt64(&r.numInQueue, 1)
bs, err := r.client.LPop(r.queueName).Bytes()
if err != nil && err != redis.Nil {
log.Error("RedisQueue: %s Error on LPop: %v", r.name, err)
atomic.AddInt64(&r.numInQueue, -1)
time.Sleep(time.Millisecond * 100)
continue
}
if len(bs) == 0 {
atomic.AddInt64(&r.numInQueue, -1)
time.Sleep(time.Millisecond * 100)
continue
}
data, err := unmarshalAs(bs, r.exemplar)
if err != nil {
log.Error("RedisQueue: %s Error on Unmarshal: %v", r.name, err)
atomic.AddInt64(&r.numInQueue, -1)
time.Sleep(time.Millisecond * 100)
continue
}
log.Trace("RedisQueue: %s Task found: %#v", r.name, data)
r.WorkerPool.Push(data)
atomic.AddInt64(&r.numInQueue, -1)
}
}
}
// Push implements Queue
func (r *RedisQueue) Push(data Data) error {
if !assignableTo(data, r.exemplar) {
return fmt.Errorf("Unable to assign data: %v to same type as exemplar: %v in %s", data, r.exemplar, r.name)
}
bs, err := json.Marshal(data)
if err != nil {
return err
}
return r.client.RPush(r.queueName, bs).Err()
}
// IsEmpty checks if the queue is empty
func (r *RedisQueue) IsEmpty() bool {
if !r.WorkerPool.IsEmpty() {
return false
}
length, err := r.client.LLen(r.queueName).Result()
if err != nil {
log.Error("Error whilst getting queue length for %s: Error: %v", r.name, err)
return false
}
return length == 0
}
// Shutdown processing from this queue
func (r *RedisQueue) Shutdown() {
log.Trace("RedisQueue: %s Shutting down", r.name)
r.lock.Lock()
select {
case <-r.closed:
default:
close(r.closed)
}
r.lock.Unlock()
log.Debug("RedisQueue: %s Shutdown", r.name)
}
// Terminate this queue and close the queue
func (r *RedisQueue) Terminate() {
log.Trace("RedisQueue: %s Terminating", r.name)
r.Shutdown()
r.lock.Lock()
select {
case <-r.terminated:
r.lock.Unlock()
default:
close(r.terminated)
r.lock.Unlock()
if log.IsDebug() {
log.Debug("RedisQueue: %s Closing with %d tasks left in queue", r.name, r.client.LLen(r.queueName))
}
if err := r.client.Close(); err != nil {
log.Error("Error whilst closing internal redis client in %s: %v", r.name, err)
}
}
log.Debug("RedisQueue: %s Terminated", r.name)
}
// Name returns the name of this queue
func (r *RedisQueue) Name() string {
return r.name
}
func init() {
queuesMap[RedisQueueType] = NewRedisQueue
}
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