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  • Swoole MySQL 连接池的实现

    概述

    这是关于 Swoole 入门学习的第八篇文章:Swoole MySQL 连接池的实现。

    收到读者的咨询,这情况大家可能也会有,所以就在这说说:

    “亮哥,我今年30岁了,有点中年危机,最近有点焦虑,发现工作虽然很忙,但是没感觉能力有所提升,整天都有写不完的业务代码,时间紧有时代码质量也不怎么样,知道还有很多改进空间,但一直没时间改,主要是后面项目压着,马上又要进入开发了,这种情况怎么办?”

    首先,我是菜鸡,观点不喜勿喷,那我就说下自己的看法:

    上面的描述比较主观,人呀有时候发现不了自己的能力很正常,有时候有能力了并不是马上就能显现的,而是到了某个阶段后突然发现,哇塞,原来自己这么厉害。

    当然能力也分很多种,比如专业能力,快速学习能力,进度把控能力,还有自信也是一种能力,不要脸是一种能力,坚持不要脸更是一种能力。

    其实能力提升最快的还是靠工作实践,悄悄问问自己加入了很多大牛的微信群,能力提升了吗?看书自学不实践是不是吸收的也不多。

    如果非要给一个具体的方案,那就是在团队内多分享吧,因为在分享前你会做充分的准备来避免分享时出丑,即使有时候自己知道,当讲出来的时候就不是那么回事了。

    前期分享可以是看稿,后期练习无稿分享。

    然后,再多说一点,30了给自己一个目标,不要盲目每天就是学学学,比如目标是技术专家,目标是业务专家,都很好呀,当然目标与自己性格有关也不是一成不变的。

    围绕着目标设置一些计划,不要以为每天的学学学,就觉得其他的一切就自然而来,其中还有很多机遇和人脉的因素。

    最后,如果实在感觉压得喘不过气,就换个环境吧,别和自己过不去。

    开始今天的文章,这篇文章实现了 Swoole MySQL 连接池,代码是在《Swoole RPC 的实现》文章的基础上进行开发的。

    先回顾上篇文章的内容:

    • 实现了 HTTP / TCP 请求
    • 实现了 同步 / 异步 请求
    • 分享了 OnRequest.php、OnReceive.php 源码
    • 业务逻辑 Order.php 中返回的是假数据

    本篇文章主要的功能点:

    • 业务逻辑 Order.php 中返回 MySQL 数据库中的数据。
    • Task 启用了协程
    • 支持 主/从 数据库配置
    • 实现数据库连接池
    • 实现数据库 CURD

    代码

    Order.php

    <?php
    
    if (!defined('SERVER_PATH')) exit("No Access");
    
    class Order
    {
        public function get_list($uid = 0, $type = 0)
        {
            //TODO 业务代码
    
            $rs[0]['order_code'] = '1';
            $rs[0]['order_name'] = '订单1';
    
            $rs[1]['order_code'] = '2';
            $rs[1]['order_name'] = '订单2';
    
            $rs[2]['order_code'] = '3';
            $rs[2]['order_name'] = '订单3';
    
            return $rs;
        }
    }
    
    修改成:
    
    class Order
    {
        private $mysql;
        private $table;
    
        public function __construct()
        {
            $pool = MysqlPool::getInstance();
            $this->mysql = $pool->get();
            $this->table = 'order';
        }
    
        public function add($code = '', $name = '')
        {
            //TODO 验证
            return $this->mysql->insert($this->table, ['code' => $code, 'name' => $name]);
        }
    
        public function edit($id = 0,  $name='')
        {
            //TODO 验证
            return $this->mysql->update($this->table, ['name' => $name], ['id' => $id]);
        }
    
        public function del($id = 0)
        {
            //TODO 验证
            return $this->mysql->delete($this->table, ['id' => $id]);
        }
    
        public function info($code = '')
        {
            //TODO 验证
            return $this->mysql->select($this->table, ['code' => $code]);
        }
    }
    

    Task 启用协程

    一、需要新增两项配置:

    enable_coroutine      = true
    task_enable_coroutine = true
    

    二、回调参数发生改变

    $serv->on('Task', function ($serv, $task_id, $src_worker_id, $data) {
       ...
    });
    
    修改成:
    
    $serv->on('Task', function ($serv, $task) {
        $task->worker_id; //来自哪个`Worker`进程
        $task->id; //任务的编号
        $task->data; //任务的数据
    });
    

    数据库 主/从 配置

    Mysql.php

    <?php
    
    if (!defined('SERVER_PATH')) exit("No Access");
    
    $db['default']['pool_size']        = 3; //连接池个数
    $db['default']['pool_get_timeout'] = 0.5; //获取连接池超时时间
    $db['default']['timeout']          = 0.5; //数据库建立连接超时时间
    $db['default']['charset']          = 'utf8'; //字符集
    $db['default']['strict_type']      = false; //开启严格模式
    $db['default']['fetch_mode']       = true; //开启fetch模式
    
    $config['master']             = $db['default'];
    $config['master']['host']     = '127.0.0.1';
    $config['master']['port']     = 3306;
    $config['master']['user']     = 'root';
    $config['master']['password'] = '123456';
    $config['master']['database'] = 'demo';
    
    $config['slave']             = $db['default'];
    $config['slave']['host']     = '127.0.0.1';
    $config['slave']['port']     = 3306;
    $config['slave']['user']     = 'root';
    $config['slave']['password'] = '123456';
    $config['slave']['database'] = 'demo';
    

    数据库连接池

    MysqlPool.php

    <?php
    
    if (!defined('SERVER_PATH')) exit("No Access");
    
    class MysqlPool
    {
        private static $instance;
        private $pool;
        private $config;
    
        public static function getInstance($config = null)
        {
            if (empty(self::$instance)) {
                if (empty($config)) {
                    throw new RuntimeException("MySQL config empty");
                }
                self::$instance = new static($config);
            }
            return self::$instance;
        }
    
        public function __construct($config)
        {
            if (empty($this->pool)) {
                $this->config = $config;
                $this->pool = new chan($config['master']['pool_size']);
                for ($i = 0; $i < $config['master']['pool_size']; $i++) {
                    go(function() use ($config) {
                        $mysql = new MysqlDB();
                        $res = $mysql->connect($config);
                        if ($res === false) {
                            throw new RuntimeException("Failed to connect mysql server");
                        } else {
                            $this->pool->push($mysql);
                        }
                    });
                }
            }
        }
    
        public function get()
        {
            if ($this->pool->length() > 0) {
                $mysql = $this->pool->pop($this->config['master']['pool_get_timeout']);
                if (false === $mysql) {
                    throw new RuntimeException("Pop mysql timeout");
                }
                defer(function () use ($mysql) { //释放
                    $this->pool->push($mysql);
                });
                return $mysql;
            } else {
                throw new RuntimeException("Pool length <= 0");
            }
        }
    }
    

    数据库 CURD

    MysqlDB.php

    <?php
    
    if (!defined('SERVER_PATH')) exit("No Access");
    
    class MysqlDB
    {
        private $master;
        private $slave;
        private $config;
    
        public function __call($name, $arguments)
        {
            if ($name != 'query') {
                throw new RuntimeException($name.":This command is not supported");
            } else {
                return $this->_execute($arguments[0]);
            }
        }
    
        public function connect($config)
        {
            //主库
            $master = new SwooleCoroutineMySQL();
            $res = $master->connect($config['master']);
            if ($res === false) {
                throw new RuntimeException($master->connect_error, $master->errno);
            } else {
                $this->master = $master;
            }
    
            //从库
            $slave = new SwooleCoroutineMySQL();
            $res = $slave->connect($config['slave']);
            if ($res === false) {
                throw new RuntimeException($slave->connect_error, $slave->errno);
            } else {
                $this->slave = $slave;
            }
    
            $this->config = $config;
            return $res;
        }
    
        public function insert($table = '', $data = [])
        {
            $fields = '';
            $values = '';
            $keys = array_keys($data);
            foreach ($keys as $k) {
                $fields .= "`".addslashes($k)."`, ";
                $values .= "'".addslashes($data[$k])."', ";
            }
            $fields = substr($fields, 0, -2);
            $values = substr($values, 0, -2);
            $sql = "INSERT INTO `{$table}` ({$fields}) VALUES ({$values})";
            return $this->_execute($sql);
        }
    
        public function update($table = '', $set = [], $where = [])
        {
            $arr_set = [];
            foreach ($set as $k => $v) {
                $arr_set[] = '`'.$k . '` = ' . $this->_escape($v);
            }
            $set = implode(', ', $arr_set);
            $where = $this->_where($where);
            $sql = "UPDATE `{$table}` SET {$set} {$where}";
            return $this->_execute($sql);
        }
    
        public function delete($table = '', $where = [])
        {
            $where = $this->_where($where);
            $sql = "DELETE FROM `{$table}` {$where}";
            return $this->_execute($sql);
        }
    
        public function select($table = '',$where = [])
        {
            $where = $this->_where($where);
            $sql = "SELECT * FROM `{$table}` {$where}";
            return $this->_execute($sql);
        }
    
        private function _where($where = [])
        {
            $str_where = '';
            foreach ($where as $k => $v) {
                $str_where .= " AND `{$k}` = ".$this->_escape($v);
            }
            return "WHERE 1 ".$str_where;
        }
    
        private function _escape($str)
        {
            if (is_string($str)) {
                $str = "'".$str."'";
            } elseif (is_bool($str)) {
                $str = ($str === FALSE) ? 0 : 1;
            } elseif (is_null($str)) {
                $str = 'NULL';
            }
            return $str;
        }
    
        private function _execute($sql)
        {
            if (strtolower(substr($sql, 0, 6)) == 'select') {
                $db = $this->_get_usable_db('slave');
            } else {
                $db = $this->_get_usable_db('master');
            }
            $result = $db->query($sql);
            if ($result === true) {
                return [
                    'affected_rows' => $db->affected_rows,
                    'insert_id'     => $db->insert_id,
                ];
            }
            return $result;
        }
    
        private function _get_usable_db($type)
        {
            if ($type == 'master') {
                if (!$this->master->connected) {
                    $master = new SwooleCoroutineMySQL();
                    $res = $master->connect($this->config['master']);
                    if ($res === false) {
                        throw new RuntimeException($master->connect_error, $master->errno);
                    } else {
                        $this->master = $master;
                    }
                }
                return $this->master;
            } elseif ($type == 'slave') {
                if (!$this->slave->connected) {
                    $slave = new SwooleCoroutineMySQL();
                    $res = $slave->connect($this->config['slave']);
                    if ($res === false) {
                        throw new RuntimeException($slave->connect_error, $slave->errno);
                    } else {
                        $this->slave = $slave;
                    }
                }
                return $this->slave;
            }
        }
    }
    

    OnWorkerStart 中调用

    try {
        MysqlPool::getInstance(get_config('mysql'));
    } catch (Exception $e) {
        $serv->shutdown();
    } catch (Throwable $throwable) {
        $serv->shutdown();
    }
    

    客户端发送请求

    <?php
    
    //新增
    $demo = [
        'type'  => 'SW',
        'token' => 'Bb1R3YLipbkTp5p0',
        'param' => [
            'class'  => 'Order',
            'method' => 'add',
            'param' => [
                'code' => 'C'.mt_rand(1000,9999),
                'name' => '订单-'.mt_rand(1000,9999),
            ],
        ],
    ];
    
    //编辑
    $demo = [
        'type'  => 'SW',
        'token' => 'Bb1R3YLipbkTp5p0',
        'param' => [
            'class'  => 'Order',
            'method' => 'edit',
            'param' => [
                'id' => '4',
                'name' => '订单-'.mt_rand(1000,9999),
            ],
        ],
    ];
    
    //删除
    $demo = [
        'type'  => 'SW',
        'token' => 'Bb1R3YLipbkTp5p0',
        'param' => [
            'class'  => 'Order',
            'method' => 'del',
            'param' => [
                'id' => '1',
            ],
        ],
    ];
    
    
    //查询
    $demo = [
        'type'  => 'SW',
        'token' => 'Bb1R3YLipbkTp5p0',
        'param' => [
            'class'  => 'Order',
            'method' => 'info',
            'param' => [
                'code' => 'C4649'
            ],
        ],
    ];
    
    $ch = curl_init();
    $options = [
        CURLOPT_URL  => 'http://10.211.55.4:9509/',
        CURLOPT_POST => 1,
        CURLOPT_POSTFIELDS => json_encode($demo),
    ];
    curl_setopt_array($ch, $options);
    curl_exec($ch);
    curl_close($ch);
    

    扩展

    官方协程 MySQL 客户端手册:

    https://wiki.swoole.com/wiki/page/p-coroutine_mysql.html

    大家可以尝试使用官方提供的其他方法。

    小结

    Demo 代码仅供参考,里面有很多不严谨的地方。

    根据自己的需要进行修改,比如业务代码相关验证,CURD 方法封装 ...

    推荐一个完善的产品,Swoole 开发的 MySQL 数据库连接池(SMProxy):

    https://github.com/louislivi/smproxy

    上面的 Demo 需要源码的,加我微信。(菜单-> 加我微信-> 扫我)

    本文欢迎转发,转发请注明作者和出处,谢谢!

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  • 原文地址:https://www.cnblogs.com/xinliangcoder/p/10930035.html
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