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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"
"github.com/go-redis/redis/v8"
)
// RedisUniqueQueueType is the type for redis queue
const RedisUniqueQueueType Type = "unique-redis"
// RedisUniqueQueue redis queue
type RedisUniqueQueue struct {
*ByteFIFOUniqueQueue
}
// RedisUniqueQueueConfiguration is the configuration for the redis queue
type RedisUniqueQueueConfiguration struct {
ByteFIFOQueueConfiguration
RedisUniqueByteFIFOConfiguration
}
// NewRedisUniqueQueue creates single redis or cluster redis queue.
//
// 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.
func NewRedisUniqueQueue(handle HandlerFunc, cfg, exemplar interface{}) (Queue, error) {
configInterface, err := toConfig(RedisUniqueQueueConfiguration{}, cfg)
if err != nil {
return nil, err
}
config := configInterface.(RedisUniqueQueueConfiguration)
byteFIFO, err := NewRedisUniqueByteFIFO(config.RedisUniqueByteFIFOConfiguration)
if err != nil {
return nil, err
}
if len(byteFIFO.setName) == 0 {
byteFIFO.setName = byteFIFO.queueName + "_unique"
}
byteFIFOQueue, err := NewByteFIFOUniqueQueue(RedisUniqueQueueType, byteFIFO, handle, config.ByteFIFOQueueConfiguration, exemplar)
if err != nil {
return nil, err
}
queue := &RedisUniqueQueue{
ByteFIFOUniqueQueue: byteFIFOQueue,
}
queue.qid = GetManager().Add(queue, RedisUniqueQueueType, config, exemplar)
return queue, nil
}
var _ UniqueByteFIFO = &RedisUniqueByteFIFO{}
// RedisUniqueByteFIFO represents a UniqueByteFIFO formed from a redisClient
type RedisUniqueByteFIFO struct {
RedisByteFIFO
setName string
}
// RedisUniqueByteFIFOConfiguration is the configuration for the RedisUniqueByteFIFO
type RedisUniqueByteFIFOConfiguration struct {
RedisByteFIFOConfiguration
SetName string
}
// NewRedisUniqueByteFIFO creates a UniqueByteFIFO formed from a redisClient
func NewRedisUniqueByteFIFO(config RedisUniqueByteFIFOConfiguration) (*RedisUniqueByteFIFO, error) {
internal, err := NewRedisByteFIFO(config.RedisByteFIFOConfiguration)
if err != nil {
return nil, err
}
fifo := &RedisUniqueByteFIFO{
RedisByteFIFO: *internal,
setName: config.SetName,
}
return fifo, nil
}
// PushFunc pushes data to the end of the fifo and calls the callback if it is added
func (fifo *RedisUniqueByteFIFO) PushFunc(ctx context.Context, data []byte, fn func() error) error {
added, err := fifo.client.SAdd(ctx, fifo.setName, data).Result()
if err != nil {
return err
}
if added == 0 {
return ErrAlreadyInQueue
}
if fn != nil {
if err := fn(); err != nil {
return err
}
}
return fifo.client.RPush(ctx, fifo.queueName, data).Err()
}
// PushBack pushes data to the top of the fifo
func (fifo *RedisUniqueByteFIFO) PushBack(ctx context.Context, data []byte) error {
added, err := fifo.client.SAdd(ctx, fifo.setName, data).Result()
if err != nil {
return err
}
if added == 0 {
return ErrAlreadyInQueue
}
return fifo.client.LPush(ctx, fifo.queueName, data).Err()
}
// Pop pops data from the start of the fifo
func (fifo *RedisUniqueByteFIFO) Pop(ctx context.Context) ([]byte, error) {
data, err := fifo.client.LPop(ctx, fifo.queueName).Bytes()
if err != nil && err != redis.Nil {
return data, err
}
if len(data) == 0 {
return data, nil
}
err = fifo.client.SRem(ctx, fifo.setName, data).Err()
return data, err
}
// Has returns whether the fifo contains this data
func (fifo *RedisUniqueByteFIFO) Has(ctx context.Context, data []byte) (bool, error) {
return fifo.client.SIsMember(ctx, fifo.setName, data).Result()
}
func init() {
queuesMap[RedisUniqueQueueType] = NewRedisUniqueQueue
}
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