Swoole MySQL 连接池的实现

Swoole MySQL 连接池的实现

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