在上篇用纯go在本机模拟了下分布式队列的东西。这里补上Redis队列部份。
用Redis做队列有下面三个问题需解决：
1. 队列构建
使用Redis的RPUSH/LPOP来解决
2. 参数传递/解析
客户端将JOSN参数存入Redis,Server端取出后解析还原。
3. 连接池
redigo支持Redis连接池
下面代码就是具体解决实现:
//Redis做后台任务队列
//author: Xiong Chuan Liang
//date: 2015-3-25
package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"time"
"github.com/garyburd/redigo/redis"
)
func main() {
r, err := newRedisPool("", "")
if err != nil {
fmt.Println(err)
return
}
//将job放入队列
r.Enqueue()
//依次取出两个Job
r.GetJob()
r.GetJob()
}
type RedisPool struct {
pool *redis.Pool
}
func newRedisPool(server, password string) (*RedisPool, error) {
if server == "" {
server = ":6379"
}
pool := &redis.Pool{
MaxIdle: 3,
IdleTimeout: 240 * time.Second,
Dial: func() (redis.Conn, error) {
c, err := redis.Dial("tcp", server)
if err != nil {
return nil, err
}
if password != "" {
if _, err := c.Do("AUTH", password); err != nil {
c.Close()
return nil, err
}
}
return c, err
},
TestOnBorrow: func(c redis.Conn, t time.Time) error {
_, err := c.Do("PING")
return err
},
}
return &RedisPool{pool}, nil
}
type Job struct {
Class string `json:"Class"`
Args []interface{} `json:"Args"`
}
//模拟客户端
func (r *RedisPool) Enqueue() error {
c := r.pool.Get()
defer c.Close()
j := &Job{}
j.Class = "mail"
j.Args = append(j.Args, "xcl_168@aliyun.com", "", "body", 2, true)
j2 := &Job{}
j2.Class = "Log"
j2.Args = append(j2.Args, "ccc.log", "ddd.log", []int{222, 333})
for _, v := range []*Job{j, j2} {
b, err := json.Marshal(v)
if err != nil {
return err
}
_, err = c.Do("rpush", "queue", b)
if err != nil {
return err
}
}
fmt.Println("[Enqueue()] succeed!")
return nil
}
//模拟Job Server
func (r *RedisPool) GetJob() error {
count, err := r.QueuedJobCount()
if err != nil || count == 0 {
return errors.New("暂无Job.")
}
fmt.Println("[GetJob()] Jobs count:", count)
c := r.pool.Get()
defer c.Close()
for i := 0; i < int(count); i++ {
reply, err := c.Do("LPOP", "queue")
if err != nil {
return err
}
var j Job
decoder := json.NewDecoder(bytes.NewReader(reply.([]byte)))
if err := decoder.Decode(&j); err != nil {
return err
}
fmt.Println("[GetJob()] ", j.Class, " : ", j.Args)
}
return nil
}
func (r *RedisPool) QueuedJobCount() (int, error) {
c := r.pool.Get()
defer c.Close()
lenqueue, err := c.Do("llen", "queue")
if err != nil {
return 0, err
}
count, ok := lenqueue.(int64)
if !ok {
return 0, errors.New("类型转换错误!")
}
return int(count), nil
}
/*
运行结果:
[Enqueue()] succeed!
[GetJob()] Jobs count: 2
[GetJob()] mail : [xcl_168@aliyun.com body 2 true]
[GetJob()] Log : [ccc.log ddd.log [222 333]]
[iyunv@xclos src]#
*/ 可以看到Go已能取得参数。都是些最基础的东西。
MAIL: xcl_168@aliyun.com
BLOG: http://blog.iyunv.com
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