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Informations about the package flower
FlowerMQ
基于Workerman和Redis实现的消息队列,一个小工具，为项目提供异步执行，支持延迟队列，失败重试。
运行依赖
- php7.2
- Redis
5.0.4上，因为用到Redis的Stream数据类型 - pecl的redis扩展
- composer包: workerman/workerman 4.0以上
安装
composer安装
下载安装
- 下载或者
git clone - 项目根目录执行命令，
composer install
服务端说明
- 下载项目后，配置 .env。
- 编写业务逻辑，app\consumer\Run.php 只需要编写这里，记得做好异常和超时处理。
- 启动，php index.php start
可用命令
- php index.php start 启动消费队列 (linux可加参数 -d，守护进程形式启动)
- php index.php pending 启动重试队列 (win)
- php index.php delay 启动延迟队列 (win)
- php index.php test 测试，执行此命令会发送两个消息给服务，一个是即时消息，一个是延迟消息。
- php index.php stop 强制停止,可能会导致消息未ack，建议附加参数 -g,会等子进程处理完后再关闭)
- php index.php config 查看配置信息
- php index.php status 查看flower运行状态
- php monitor.php start 运行信息查看，会启动一个http进程
windows下仅限于开发，不适合做生产环境使用，启动需要开三个命令行窗口，分别执行 start、pending、delay命令
客户端说明
flower配备了一个客户端，方便在别的项目中使用:
使用方式:
原理说明
- 多个consumer进程，在onWorkerStart 函数处，阻塞读取，超时5秒，判断是否需要停止。
- pending进程,每隔0.5秒检查是否有未ack的消息，并尝试消费掉
- delay进程,处理延迟消息，用redis的zset有序集合存储，定时获取可以执行的消息，写入消费端
- 配置是app/config/app.php，可以在项目根目录下，提供一个.env文件，替换默认配置
- 回收裁剪机制: 有三种模式，默认 no ，不做裁剪
- no,不做裁剪，所有消息保留。
- maxlen, 最大长度回收,概率性触发
xtrim maxlen mq ~ 长度。 - minid, 最小已读消息回收，概率行触发，
xtrim minid mq ~ 消息id，需要 redis server 6.2.0 以上。问题
- 如何支持两个消息队列 ?
- 如何支持一个消息队列，多个消费组
- 性能测试
- 如何操作MySQL
- 如何避免内存泄露，由于是守护进程，业务代码bug隐藏的内存泄露，可以在消费者执行完一定数量的时候重启进程。具体实现请查看workerman手册。链接1、链接2
- 为啥需要Redis 5.0.4 及以上，5.0.3有个xClaim的bug,不会触发消息转义加1的问题。
- 时间不对，因为系统没有设置默认时区，而这个应该开发者确定，可以在入口文件 index.php 和 monitor.php 里面写上:
相关资料
- redis stream 手册 是redis stream命令的详细介绍。
- redis streams简介 是redis官网关于redis stream的介绍，在使用该项目前，建议详细阅读它。
- pecl redis 文档， 如何使用php操作redis的文档
- workerman 手册
引用
- monitor登录页模板
- env、config类这些学自thinkphp
- monitor 后端的一些代码，学自webman
- monitor主页面，用的layui
- 延迟队列的思路抄的workerman的redis queue
- 感谢workerman、thinkphp、layui、redis
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