Swoole MySQL 连接池的实现

阅读 593
收藏 10
2019-05-27
原文链接:mp.weixin.qq.com

第 84 篇文章

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

概述

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 Swoole\Coroutine\MySQL();

    $res = $master->connect($config['master']);

    if ($res === false) {

    throw new RuntimeException($master->connect_error, $master->errno);

    } else {

    $this->master = $master;

    }

    //从库

    $slave = new Swoole\Coroutine\MySQL();

    $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 Swoole\Coroutine\MySQL();

    $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 Swoole\Coroutine\MySQL();

    $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)

推荐阅读

本文欢迎转发,转发请注明作者和出处,谢谢!

评论