推荐：《PHP视频教程》
前言
模拟supervisor进程管理demo（简易实现）
没错，是造轮子！目的在于学习！
截图：
在图中自己实现了一个
Copy子进程的功能。如果用在AMQP增减消费者时，我觉得应该会很有用。
实现
1、在主进程循环内启动子进程执行命令
2、在web输入 127.0.0.1:7865 获取子进程状态
3、socket接收请求消息，并且执行相应操作，返回web页面
4、回收子进程，防止称为僵尸进程
不足：无法持续监听错误页面。由于socket得到的响应是通过include函数加载的，所以在加载的页面内不能出现tail -f命令，否则stream就会掉入了死循环了~。我想应该有方案解决（写了socket+多进程模式，模仿fpm在接收到请求之后就启动一个子进程去处理的模式，但是执行有问题。因此将代码贴出来希望得到大家的指点）。
延伸：由于对进程可以很好的管理（期望如此），那么就可以定制化自己的一些需求，比如：（1）定制AMQP的消费者进程管理服务。（2）模拟crontab定时服务。
立即学习“PHP免费学习笔记（深入）”；
知识点
代码实现的过程中，有很多的细节是值得学习的。
1、在while()循环中，启用了stream的非阻塞模式。所以不能在循环中使用sleep(1)，而是用stream_select($read, $write, $except, 1)让stream内部阻塞。
关于阻塞非阻塞模式，可以参阅这里
2、能够执行外部程序的函数很多，但是都稍有不同。这里采用的是proc_open，是一个很强大的函数。在这之前我曾用pcntl_exec执行过外部程序，但是需要先pcntl_fork。而用其他的如exec,shell_exec无法对子进程进行管理。
3、重启或停止等操作子进程时，只是先更改主进程中该子进程在内存中的的状态，并不是真正的对子进程操作。在统一处init()处理子进程。如此才能防止因为子进程启动时的上下文导致的一些怪异的现象。
代码
由于代码过多，所以如果你对我的方案有更好的建议可以在github这里看。
主进程代码：Process.php
consumers = $this->getConsumers();
}
// 这里是个DEMO，实际可以用读取配置文件的方式。
public function getConsumers()
{
$consumer = new Consumer([
'program' => 'test',
'command' => '/usr/bin/php test.php',
'directory' => __DIR__,
'logfile' => __DIR__ . '/test.log',
'uniqid' => uniqid(),
'auto_restart' => false,
]);
return [
$consumer->uniqid => $consumer,
];
}
public function run()
{
if (empty($this->consumers)) {
// consumer empty
return;
}
if ($this->_notifyMaster()) {
// master alive
return;
}
$pid = pcntl_fork();
if ($pid < 0) {
exit;
} elseif ($pid > 0) {
exit;
}
if (!posix_setsid()) {
exit;
}
$stream = new StreamConnection('tcp://0.0.0.0:7865');
@cli_set_process_title('AMQP Master Process');
// 将主进程ID写入文件
file_put_contents(self::PPID_FILE, getmypid());
// master进程继续
while (true) {
$this->init();
pcntl_signal_dispatch();
$this->waitpid();
// 如果子进程被全部回收，则主进程退出
// if (empty($this->childPids)) {
// $stream->close($stream->getSocket());
// break;
// }
$stream->accept(function ($uniqid, $action) {
$this->handle($uniqid, $action);
return $this->display();
});
}
}
protected function init()
{
foreach ($this->consumers as &$c) {
switch ($c->state) {
case Consumer::RUNNING:
case Consumer::STOP:
break;
case Consumer::NOMINAL:
case Consumer::STARTING:
$this->fork($c);
break;
case Consumer::STOPING:
if ($c->pid && posix_kill($c->pid, SIGTERM)) {
$this->reset($c, Consumer::STOP);
}
break;
case Consumer::RESTART:
if (empty($c->pid)) {
$this->fork($c);
break;
}
if (posix_kill($c->pid, SIGTERM)) {
$this->reset($c, Consumer::STOP);
$this->fork($c);
}
break;
default:
break;
}
}
}
protected function reset(Consumer $c, $state)
{
$c->pid = '';
$c->uptime = '';
$c->state = $state;
$c->process = null;
}
protected function waitpid()
{
foreach ($this->childPids as $uniqid => $pid) {
$result = pcntl_waitpid($pid, $status, WNOHANG);
if ($result == $pid || $result == -1) {
unset($this->childPids[$uniqid]);
$c = &$this->consumers[$uniqid];
$state = pcntl_wifexited($status) ? Consumer::EXITED : Consumer::STOP;
$this->reset($c, $state);
}
}
}
/**
* 父进程存活情况下，只会通知父进程信息，否则可能产生多个守护进程
*/
private function _notifyMaster()
{
$ppid = file_get_contents(self::PPID_FILE );
$isAlive = $this->checkProcessAlive($ppid);
if (!$isAlive) return false;
return true;
}
public function checkProcessAlive($pid)
{
if (empty($pid)) return false;
$pidinfo = `ps co pid {$pid} | xargs`;
$pidinfo = trim($pidinfo);
$pattern = "/.*?PID.*?(\d+).*?/";
preg_match($pattern, $pidinfo, $matches);
return empty($matches) ? false : ($matches[1] == $pid ? true : false);
}
/**
* fork一个新的子进程
*/
protected function fork(Consumer $c)
{
$descriptorspec = [2 => ['file', $c->logfile, 'a'],];
$process = proc_open('exec ' . $c->command, $descriptorspec, $pipes, $c->directory);
if ($process) {
$ret = proc_get_status($process);
if ($ret['running']) {
$c->state = Consumer::RUNNING;
$c->pid = $ret['pid'];
$c->process = $process;
$c->uptime = date('m-d H:i');
$this->childPids[$c->uniqid] = $ret['pid'];
} else {
$c->state = Consumer::EXITED;
proc_close($process);
}
} else {
$c->state = Consumer::ERROR;
}
return $c;
}
public function display()
{
$location = 'http://127.0.0.1:7865';
$basePath = Http::$basePath;
$scriptName = isset($_SERVER['SCRIPT_NAME']) &&
!empty($_SERVER['SCRIPT_NAME']) &&
$_SERVER['SCRIPT_NAME'] != '/' ? $_SERVER['SCRIPT_NAME'] : '/index.php';
if ($scriptName == '/index.html') {
return Http::status_301($location);
}
$sourcePath = $basePath . $scriptName;
if (!is_file($sourcePath)) {
return Http::status_404();
}
ob_start();
include $sourcePath;
$response = ob_get_contents();
ob_clean();
return Http::status_200($response);
}
public function handle($uniqid, $action)
{
if (!empty($uniqid) && !isset($this->consumers[$uniqid])) {
return;
}
switch ($action) {
case 'refresh':
break;
case 'restartall':
$this->killall(true);
break;
case 'stopall':
$this->killall();
break;
case 'stop':
$c = &$this->consumers[$uniqid];
if ($c->state != Consumer::RUNNING) break;
$c->state = Consumer::STOPING;
break;
case 'start':
$c = &$this->consumers[$uniqid];
if ($c->state == Consumer::RUNNING) break;
$c->state = Consumer::STARTING;
break;
case 'restart':
$c = &$this->consumers[$uniqid];
$c->state = Consumer::RESTART;
break;
case 'copy':
$c = $this->consumers[$uniqid];
$newC = clone $c;
$newC->uniqid = uniqid('C');
$newC->state = Consumer::NOMINAL;
$newC->pid = '';
$this->consumers[$newC->uniqid] = $newC;
break;
default:
break;
}
}
protected function killall($restart = false)
{
foreach ($this->consumers as &$c) {
$c->state = $restart ? Consumer::RESTART : Consumer::STOPING;
}
}}$cli = new Process();$cli->run();Consumer消费者对象
stream相关代码：StreamConnection.php
socket = $this->connect($host); } public function connect($host) { $socket = stream_socket_server($host, $errno, $errstr); if (!$socket) { exit('stream error'); } stream_set_timeout($socket, $this->timeout); stream_set_chunk_size($socket, 1024); stream_set_blocking($socket, false); $this->client = [$socket]; return $socket; } public function accept(Closure $callback) { $read = $this->client; if (stream_select($read, $write, $except, 1) < 1) return; if (in_array($this->socket, $read)) { $cs = stream_socket_accept($this->socket); $this->client[] = $cs; } foreach ($read as $s) { if ($s == $this->socket) continue; $header = fread($s, 1024); if (empty($header)) { $index = array_search($s, $this->client); if ($index) unset($this->client[$index]); $this->close($s); continue; } Http::parse_http($header); $uniqid = isset($_GET['uniqid']) ? $_GET['uniqid'] : ''; $action = isset($_GET['action']) ? $_GET['action'] : ''; $response = $callback($uniqid, $action); $this->write($s, $response); $index = array_search($s, $this->client); if ($index) unset($this->client[$index]); $this->close($s); } } public function write($socket, $response) { $ret = fwrite($socket, $response, strlen($response)); } public function close($socket) { $flag = fclose($socket); } public function getSocket() { return $this->socket; }}Http响应代码：Http.php
'', 'REQUEST_METHOD' => '', 'REQUEST_URI' => '', 'SERVER_PROTOCOL' => '', 'SERVER_SOFTWARE' => '', 'SERVER_NAME' => '', 'HTTP_HOST' => '', 'HTTP_USER_AGENT' => '', 'HTTP_ACCEPT' => '', 'HTTP_ACCEPT_LANGUAGE' => '', 'HTTP_ACCEPT_ENCODING' => '', 'HTTP_COOKIE' => '', 'HTTP_CONNECTION' => '', 'REMOTE_ADDR' => '', 'REMOTE_PORT' => '0', 'SCRIPT_NAME' => '', 'HTTP_REFERER' => '', 'CONTENT_TYPE' => '', 'HTTP_IF_NONE_MATCH' => '', ); // 将header分割成数组 list($http_header, $http_body) = explode("\r\n\r\n", $http, 2); $header_data = explode("\r\n", $http_header); list($_SERVER['REQUEST_METHOD'], $_SERVER['REQUEST_URI'], $_SERVER['SERVER_PROTOCOL']) = explode(' ', $header_data[0]); unset($header_data[0]); foreach ($header_data as $content) { // \r\n\r\n if (empty($content)) { continue; } list($key, $value) = explode(':', $content, 2); $key = strtolower($key); $value = trim($value); switch ($key) { case 'host': $_SERVER['HTTP_HOST'] = $value; $tmp = explode(':', $value); $_SERVER['SERVER_NAME'] = $tmp[0]; if (isset($tmp[1])) { $_SERVER['SERVER_PORT'] = $tmp[1]; } break; case 'cookie': $_SERVER['HTTP_COOKIE'] = $value; parse_str(str_replace('; ', '&', $_SERVER['HTTP_COOKIE']), $_COOKIE); break; case 'user-agent': $_SERVER['HTTP_USER_AGENT'] = $value; break; case 'accept': $_SERVER['HTTP_ACCEPT'] = $value; break; case 'accept-language': $_SERVER['HTTP_ACCEPT_LANGUAGE'] = $value; break; case 'accept-encoding': $_SERVER['HTTP_ACCEPT_ENCODING'] = $value; break; case 'connection': $_SERVER['HTTP_CONNECTION'] = $value; break; case 'referer': $_SERVER['HTTP_REFERER'] = $value; break; case 'if-modified-since': $_SERVER['HTTP_IF_MODIFIED_SINCE'] = $value; break; case 'if-none-match': $_SERVER['HTTP_IF_NONE_MATCH'] = $value; break; case 'content-type': if (!preg_match('/boundary="?(\S+)"?/', $value, $match)) { $_SERVER['CONTENT_TYPE'] = $value; } else { $_SERVER['CONTENT_TYPE'] = 'multipart/form-data'; $http_post_boundary = '--' . $match[1]; } break; } } // script_name $_SERVER['SCRIPT_NAME'] = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH); // QUERY_STRING $_SERVER['QUERY_STRING'] = parse_url($_SERVER['REQUEST_URI'], PHP_URL_QUERY); if ($_SERVER['QUERY_STRING']) { // $GET parse_str($_SERVER['QUERY_STRING'], $_GET); } else { $_SERVER['QUERY_STRING'] = ''; } // REQUEST $_REQUEST = array_merge($_GET, $_POST); return array('get' => $_GET, 'post' => $_POST, 'cookie' => $_COOKIE, 'server' => $_SERVER, 'files' => $_FILES); } public static function status_404() { return <<待执行的脚本：test.php
在当前目录下的视图页面：
|- Process.php
|- Http.php
|- StreamConnection.php
|- Consumer.php
|- BaseObject.php
|- views/更多编程相关知识，请访问：编程教学！！
