本篇文章关键词：Workerman事件类,Workerman定时类
一、事件类
1、事件类实现：
workerman实现了5种方式的事件类，在Events文件夹，分别是Ev,libevent，event，swoole，select。前四种需要安装对应扩展，最后一种是用队列与信号实现的，就是使用PHP原生函数实现。他们都集成EventInterface接口，这五种事件类表现出的方法是一样的。所以我们只看一种的内部实现，select类。
在上一章worker代码中，引入event的方法
protected static $_availableEventLoops = array(
'libevent' => '\Workerman\Events\Libevent',
'event' => '\Workerman\Events\Event',
'swoole' => '\Workerman\Events\Swoole'
);
protected static function getEventLoopName()
{
if (static::$eventLoopClass) {
return static::$eventLoopClass;
}
$loop_name = '';
foreach (static::$_availableEventLoops as $name=>$class) {
if (extension_loaded($name)) {
$loop_name = $name;
break;
}
}
if ($loop_name) {
if (interface_exists('\React\EventLoop\LoopInterface')) {
switch ($loop_name) {
case 'libevent':
static::$eventLoopClass = '\Workerman\Events\React\ExtLibEventLoop';
break;
case 'event':
static::$eventLoopClass = '\Workerman\Events\React\ExtEventLoop';
break;
default :
static::$eventLoopClass = '\Workerman\Events\React\StreamSelectLoop';
break;
}
} else {
static::$eventLoopClass = static::$_availableEventLoops[$loop_name];
}
} else {
static::$eventLoopClass = interface_exists('\React\EventLoop\LoopInterface')? '\Workerman\Events\React\StreamSelectLoop':'\Workerman\Events\Select';
}
return static::$eventLoopClass;
}这个方法是判断有没有安装相应的扩展，没安装就使用select事件类
2、new select，首先看select的构造方法，创建一个socket跟一个队列
public function __construct()
{
// 创建一个socket
$this->channel = stream_socket_pair(DIRECTORY_SEPARATOR === '/' ? STREAM_PF_UNIX :
STREAM_PF_INET,
STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
if($this->channel) {
stream_set_blocking($this->channel[0], 0);
$this->_readFds[0] = $this->channel[0];
}
// 新建优先队列.信号使用
$this->_scheduler = new \SplPriorityQueue();
$this->_scheduler->setExtractFlags(\SplPriorityQueue::EXTR_BOTH);
}3、add()，注册一个事件。当发生此事件时，回调相应方法
调用的时候这样调用：static::$globalEvent->add($this->_mainSocket, EventInterface::EV_READ, array($this, ‘acceptConnection’));
//$fd:文件描述符
//$flag:事件类型
//$func:事件回调函数
//$args:参数
public function add($fd, $flag, $func, $args = array())
{
switch ($flag) {
case self::EV_READ:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_readFds[$fd_key] = $fd;
break;
case self::EV_WRITE:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_writeFds[$fd_key] = $fd;
break;
case self::EV_EXCEPT:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_exceptFds[$fd_key] = $fd;
break;
//注册的是信号
case self::EV_SIGNAL:
// Windows not support signal.
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
$fd_key = (int)$fd;
$this->_signalEvents[$fd_key][$flag] = array($func, $fd);
pcntl_signal($fd, array($this, 'signalHandler'));
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE:
$timer_id = $this->_timerId++;
$run_time = microtime(true) + $fd;
//定时任务存在队列里
$this->_scheduler->insert($timer_id, -$run_time);
//_eventTimer存此任务其他信息
$this->_eventTimer[$timer_id] = array($func, (array)$args, $flag, $fd);
$select_timeout = ($run_time - microtime(true)) * 1000000;
if( $this->_selectTimeout > $select_timeout ){
$this->_selectTimeout = $select_timeout;
}
return $timer_id;
}
return true;
}
public function signalHandler($signal)
{
call_user_func_array($this->_signalEvents[$signal][self::EV_SIGNAL][0], array($signal));
}4、del()，删除事件，就是在队列里或者_allEvents数组里删除对应的事件标识
内网穿透– 用我最直白的语言解读优秀源码
public function del($fd, $flag)
{
$fd_key = (int)$fd;
switch ($flag) {
case self::EV_READ:
unset($this->_allEvents[$fd_key][$flag], $this->_readFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_WRITE:
unset($this->_allEvents[$fd_key][$flag], $this->_writeFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_EXCEPT:
unset($this->_allEvents[$fd_key][$flag], $this->_exceptFds[$fd_key]);
if(empty($this->_allEvents[$fd_key]))
{
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_SIGNAL:
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
unset($this->_signalEvents[$fd_key]);
pcntl_signal($fd, SIG_IGN);
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE;
unset($this->_eventTimer[$fd_key]);
return true;
}
return false;
}4、loop()，事件循环监听代码
public function loop()
{
$e = null;
while (1) {
if(DIRECTORY_SEPARATOR === '/') {
// 如果有事件发生就执行下回调
pcntl_signal_dispatch();
}
$read = $this->_readFds;
$write = $this->_writeFds;
$except = $this->_exceptFds;
// 去掉错误
set_error_handler(function(){});
//stream_select是等待 read/write/signal/timeout 事件，在_selectTimeout内有对应事件发生返回发生的数量
$ret = stream_select($read, $write, $except, 0, $this->_selectTimeout);
restore_error_handler();
//
if (!$this->_scheduler->isEmpty()) {
$this->tick();
}
if (!$ret) {
continue;
}
//如果有读事件发生，就执行add注册的事件的方法，并传入注册时的socket，如在worker.php中的static::$globalEvent->add($this->_mainSocket, EventInterface::EV_READ, array($this, 'acceptConnection'));，就会执行acceptConnection
if ($read) {
foreach ($read as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_READ])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_READ][0],
array($this->_allEvents[$fd_key][self::EV_READ][1]));
}
}
}
//同上
if ($write) {
foreach ($write as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_WRITE])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_WRITE][0],
array($this->_allEvents[$fd_key][self::EV_WRITE][1]));
}
}
}
//同上
if($except) {
foreach($except as $fd) {
$fd_key = (int) $fd;
if(isset($this->_allEvents[$fd_key][self::EV_EXCEPT])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_EXCEPT][0],
array($this->_allEvents[$fd_key][self::EV_EXCEPT][1]));
}
}
}
}
}5、tick()，loop中执行此函数，在队列中循环寻找可以执行的事件
protected function tick()
{
while (!$this->_scheduler->isEmpty()) {
$scheduler_data = $this->_scheduler->top();
$timer_id = $scheduler_data['data'];
$next_run_time = -$scheduler_data['priority'];
$time_now = microtime(true);
$this->_selectTimeout = ($next_run_time - $time_now) * 1000000;
//此事件到时间可以执行了
if ($this->_selectTimeout <= 0) { $this->_scheduler->extract();
if (!isset($this->_eventTimer[$timer_id])) {
continue;
}
// [func, args, flag, timer_interval]
$task_data = $this->_eventTimer[$timer_id];
if ($task_data[2] === self::EV_TIMER) {
$next_run_time = $time_now + $task_data[3];
$this->_scheduler->insert($timer_id, -$next_run_time);
}
//执行
call_user_func_array($task_data[0], $task_data[1]);
//是否需要循环执行
if (isset($this->_eventTimer[$timer_id]) && $task_data[2] === self::EV_TIMER_ONCE) {
$this->del($timer_id, self::EV_TIMER_ONCE);
}
continue;
}
return;
}
$this->_selectTimeout = 100000000;
}贴上完整的select类源代码
内网穿透– 用我最直白的语言解读优秀源码
<?php
/**
* This file is part of workerman.
*
* Licensed under The MIT License
* For full copyright and license information, please see the MIT-LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @author walkor<walkor@workerman.net>
* @copyright walkor<walkor@workerman.net>
* @link http://www.workerman.net/
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Workerman\Events;
/**
* select eventloop
*/
class Select implements EventInterface
{
/**
* All listeners for read/write event.
*
* @var array
*/
public $_allEvents = array();
/**
* Event listeners of signal.
*
* @var array
*/
public $_signalEvents = array();
/**
* Fds waiting for read event.
*
* @var array
*/
protected $_readFds = array();
/**
* Fds waiting for write event.
*
* @var array
*/
protected $_writeFds = array();
/**
* Fds waiting for except event.
*
* @var array
*/
protected $_exceptFds = array();
/**
* Timer scheduler.
* {['data':timer_id, 'priority':run_timestamp], ..}
*
* @var \SplPriorityQueue
*/
protected $_scheduler = null;
/**
* All timer event listeners.
* [[func, args, flag, timer_interval], ..]
*
* @var array
*/
protected $_eventTimer = array();
/**
* Timer id.
*
* @var int
*/
protected $_timerId = 1;
/**
* Select timeout.
*
* @var int
*/
protected $_selectTimeout = 100000000;
/**
* Paired socket channels
*
* @var array
*/
protected $channel = array();
/**
* Construct.
*/
public function __construct()
{
// Create a pipeline and put into the collection of the read to read the descriptor to avoid empty polling.
$this->channel = stream_socket_pair(DIRECTORY_SEPARATOR === '/' ? STREAM_PF_UNIX : STREAM_PF_INET,
STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
if($this->channel) {
stream_set_blocking($this->channel[0], 0);
$this->_readFds[0] = $this->channel[0];
}
// Init SplPriorityQueue.
$this->_scheduler = new \SplPriorityQueue();
$this->_scheduler->setExtractFlags(\SplPriorityQueue::EXTR_BOTH);
}
/**
* {@inheritdoc}
*/
public function add($fd, $flag, $func, $args = array())
{
switch ($flag) {
case self::EV_READ:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_readFds[$fd_key] = $fd;
break;
case self::EV_WRITE:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_writeFds[$fd_key] = $fd;
break;
case self::EV_EXCEPT:
$fd_key = (int)$fd;
$this->_allEvents[$fd_key][$flag] = array($func, $fd);
$this->_exceptFds[$fd_key] = $fd;
break;
case self::EV_SIGNAL:
// Windows not support signal.
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
$fd_key = (int)$fd;
$this->_signalEvents[$fd_key][$flag] = array($func, $fd);
pcntl_signal($fd, array($this, 'signalHandler'));
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE:
$timer_id = $this->_timerId++;
$run_time = microtime(true) + $fd;
$this->_scheduler->insert($timer_id, -$run_time);
$this->_eventTimer[$timer_id] = array($func, (array)$args, $flag, $fd);
$select_timeout = ($run_time - microtime(true)) * 1000000;
if( $this->_selectTimeout > $select_timeout ){
$this->_selectTimeout = $select_timeout;
}
return $timer_id;
}
return true;
}
/**
* Signal handler.
*
* @param int $signal
*/
public function signalHandler($signal)
{
call_user_func_array($this->_signalEvents[$signal][self::EV_SIGNAL][0], array($signal));
}
/**
* {@inheritdoc}
*/
public function del($fd, $flag)
{
$fd_key = (int)$fd;
switch ($flag) {
case self::EV_READ:
unset($this->_allEvents[$fd_key][$flag], $this->_readFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_WRITE:
unset($this->_allEvents[$fd_key][$flag], $this->_writeFds[$fd_key]);
if (empty($this->_allEvents[$fd_key])) {
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_EXCEPT:
unset($this->_allEvents[$fd_key][$flag], $this->_exceptFds[$fd_key]);
if(empty($this->_allEvents[$fd_key]))
{
unset($this->_allEvents[$fd_key]);
}
return true;
case self::EV_SIGNAL:
if(DIRECTORY_SEPARATOR !== '/') {
return false;
}
unset($this->_signalEvents[$fd_key]);
pcntl_signal($fd, SIG_IGN);
break;
case self::EV_TIMER:
case self::EV_TIMER_ONCE;
unset($this->_eventTimer[$fd_key]);
return true;
}
return false;
}
/**
* Tick for timer.
*
* @return void
*/
protected function tick()
{
while (!$this->_scheduler->isEmpty()) {
$scheduler_data = $this->_scheduler->top();
$timer_id = $scheduler_data['data'];
$next_run_time = -$scheduler_data['priority'];
$time_now = microtime(true);
$this->_selectTimeout = ($next_run_time - $time_now) * 1000000;
if ($this->_selectTimeout <= 0) {
$this->_scheduler->extract();
if (!isset($this->_eventTimer[$timer_id])) {
continue;
}
// [func, args, flag, timer_interval]
$task_data = $this->_eventTimer[$timer_id];
if ($task_data[2] === self::EV_TIMER) {
$next_run_time = $time_now + $task_data[3];
$this->_scheduler->insert($timer_id, -$next_run_time);
}
call_user_func_array($task_data[0], $task_data[1]);
if (isset($this->_eventTimer[$timer_id]) && $task_data[2] === self::EV_TIMER_ONCE) {
$this->del($timer_id, self::EV_TIMER_ONCE);
}
continue;
}
return;
}
$this->_selectTimeout = 100000000;
}
/**
* {@inheritdoc}
*/
public function clearAllTimer()
{
$this->_scheduler = new \SplPriorityQueue();
$this->_scheduler->setExtractFlags(\SplPriorityQueue::EXTR_BOTH);
$this->_eventTimer = array();
}
/**
* {@inheritdoc}
*/
public function loop()
{
$e = null;
while (1) {
if(DIRECTORY_SEPARATOR === '/') {
// Calls signal handlers for pending signals
pcntl_signal_dispatch();
}
$read = $this->_readFds;
$write = $this->_writeFds;
$except = $this->_exceptFds;
// Waiting read/write/signal/timeout events.
set_error_handler(function(){});
$ret = stream_select($read, $write, $except, 0, $this->_selectTimeout);
restore_error_handler();
if (!$this->_scheduler->isEmpty()) {
$this->tick();
}
if (!$ret) {
continue;
}
if ($read) {
foreach ($read as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_READ])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_READ][0],
array($this->_allEvents[$fd_key][self::EV_READ][1]));
}
}
}
if ($write) {
foreach ($write as $fd) {
$fd_key = (int)$fd;
if (isset($this->_allEvents[$fd_key][self::EV_WRITE])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_WRITE][0],
array($this->_allEvents[$fd_key][self::EV_WRITE][1]));
}
}
}
if($except) {
foreach($except as $fd) {
$fd_key = (int) $fd;
if(isset($this->_allEvents[$fd_key][self::EV_EXCEPT])) {
call_user_func_array($this->_allEvents[$fd_key][self::EV_EXCEPT][0],
array($this->_allEvents[$fd_key][self::EV_EXCEPT][1]));
}
}
}
}
}
/**
* Destroy loop.
*内网穿透– 用我最直白的语言解读优秀源码
* @return void
*/
public function destroy()
{
}
/**
* Get timer count.
*
* @return integer
*/
public function getTimerCount()
{
return count($this->_eventTimer);
}
}二、定时任务类
定时任务类Timer使用两种定时任务方法，一种使用上面的事件，另一种是使用系统的时钟信号，精度一秒，系统每秒给Timer发送一次信号，Timer执行tick函数检查有没有执行的任务。
<?php
/**
* This file is part of workerman.
*
* Licensed under The MIT License
* For full copyright and license information, please see the MIT-LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @author walkor<walkor@workerman.net>
* @copyright walkor<walkor@workerman.net>
* @link http://www.workerman.net/
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Workerman\Lib;
use Workerman\Events\EventInterface;
use Exception;
/**
* Timer.
*
* example:
* Workerman\Lib\Timer::add($time_interval, callback, array($arg1, $arg2..));
*/
class Timer
{
/**
* Tasks that based on ALARM signal.
* [
* run_time => [[$func, $args, $persistent, time_interval],[$func, $args, $persistent, time_interval],..]],
* run_time => [[$func, $args, $persistent, time_interval],[$func, $args, $persistent, time_interval],..]],
* ..
* ]
*
* @var array
*/
protected static $_tasks = array();
/**
* event
*
* @var \Workerman\Events\EventInterface
*/
protected static $_event = null;
/**
* 初始化，如果不传则使用时钟信号，否则使用对应的事件函数
*
* @param \Workerman\Events\EventInterface $event
* @return void
*/
public static function init($event = null)
{
if ($event) {
self::$_event = $event;
} else {
if (function_exists('pcntl_signal')) {
pcntl_signal(SIGALRM, array('\Workerman\Lib\Timer', 'signalHandle'), false);
}
}
}
/**
* 时钟信号回调，每秒回调一次
*
* @return void
*/
public static function signalHandle()
{
if (!self::$_event) {
pcntl_alarm(1);
self::tick();
}
}
/**
* 增加一个定时任务
*
* @param float $time_interval
* @param callable $func
* @param mixed $args
* @param bool $persistent
* @return int/false
*/
public static function add($time_interval, $func, $args = array(), $persistent = true)
{
if ($time_interval <= 0) {
Worker::safeEcho(new Exception("bad time_interval"));
return false;
}
//使用事件类的话
if (self::$_event) {
return self::$_event->add($time_interval,
$persistent ? EventInterface::EV_TIMER : EventInterface::EV_TIMER_ONCE, $func, $args);
}
if (!is_callable($func)) {
Worker::safeEcho(new Exception("not callable"));
return false;
}
if (empty(self::$_tasks)) {
pcntl_alarm(1);
}
//不使用事件类，加到自己的self::$_tasks中
$time_now = time();
$run_time = $time_now + $time_interval;
if (!isset(self::$_tasks[$run_time])) {
self::$_tasks[$run_time] = array();
}
self::$_tasks[$run_time][] = array($func, (array)$args, $persistent, $time_interval);
return 1;
}
/**
* 不使用事件类执行
*
* @return void
*/
public static function tick()
{
if (empty(self::$_tasks)) {
pcntl_alarm(0);
return;
}
$time_now = time();
foreach (self::$_tasks as $run_time => $task_data) {
if ($time_now >= $run_time) {
foreach ($task_data as $index => $one_task) {
$task_func = $one_task[0];
$task_args = $one_task[1];
$persistent = $one_task[2];
$time_interval = $one_task[3];
try {
call_user_func_array($task_func, $task_args);
} catch (\Exception $e) {
Worker::safeEcho($e);
}
if ($persistent) {
self::add($time_interval, $task_func, $task_args);
}
}
unset(self::$_tasks[$run_time]);
}
}
}
/**
* 删除一个定时
*
* @param mixed $timer_id
* @return bool
*/
public static function del($timer_id)
{
if (self::$_event) {
return self::$_event->del($timer_id, EventInterface::EV_TIMER);
}
return false;
}
/**
* 删除所有
*
* @return void
*/
public static function delAll()
{
self::$_tasks = array();
pcntl_alarm(0);
if (self::$_event) {
self::$_event->clearAllTimer();
}
}
}内网穿透– 用我最直白的语言解读优秀源码
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