PHP如何处理集中式curl\u多请求？
我目前有一个用PHP编写的网站，利用curl_multi轮询外部API。服务器将子进程从web请求转移到独立进程，并且工作良好，但它在某种程度上仅限于每个进程 有时它会遇到带宽瓶颈，需要更好的集中排队逻辑 我目前正在尝试用一个独立的后台进程来处理所有传出的请求，但我遇到了一些通常说来不太可能由临时程序员处理的问题。垃圾收集，进程间异常处理，请求-响应匹配。。。等等，我走错方向了吗 有没有一个通用的实践（实现理论），或者甚至是我可以利用的图书馆 编辑 使用本地主机TCP/IP通信将使本地通信的压力加倍，这绝对不是一个好方法PHP如何处理集中式curl\u多请求？,php,curl,ipc,curl-multi,Php,Curl,Ipc,Curl Multi,我目前有一个用PHP编写的网站，利用curl_multi轮询外部API。服务器将子进程从web请求转移到独立进程，并且工作良好，但它在某种程度上仅限于每个进程 有时它会遇到带宽瓶颈，需要更好的集中排队逻辑 我目前正在尝试用一个独立的后台进程来处理所有传出的请求，但我遇到了一些通常说来不太可能由临时程序员处理的问题。垃圾收集，进程间异常处理，请求-响应匹配。。。等等，我走错方向了吗 有没有一个通用的实践（实现理论），或者甚至是我可以利用的图书馆 编辑 使用本地主机TCP/IP通信将使本地通信的压力
我目前正在使用一些自制的协议处理IPC消息队列。。。一点也不对劲。非常感谢您的帮助。这里有几个不同的地方需要区分：
- 作业：您有N个作业要处理。执行的任务可能会崩溃或挂起，所有作业都应在不丢失任何数据的情况下进行
- 资源：您在一台机器和/或一个连接中处理作业，因此您需要注意cpu和bandwith
- 同步：如果进程之间存在交互，则需要共享信息，同时处理并发数据访问
控制资源 每个人都想上车。。。 因为PHP中没有内置线程，所以我们需要模拟互斥体。原则很简单： 1所有作业都放入队列中 2有N个可用资源，池中没有更多资源 3我们迭代队列（在每个作业上执行
时执行）
4在执行之前，作业请求池中的资源
5如果有可用资源，则执行作业
6如果没有更多的资源，则池将挂起，直到作业完成或被视为已死亡
如何在PHP中实现这一点？
我们有几种可能，但原则是一样的：
我们有两个项目：
- 有一个进程启动器，它将同时启动不超过N个任务
- 有一个进程子进程，它表示
线程的上下文
流程启动器的外观如何？
process launcher知道应该运行多少任务，并在不考虑其结果的情况下运行这些任务。它只控制它们的执行（进程启动、完成或挂起，并且N已经在运行）
PHP我给你这个想法在这里，我稍后会给你一些有用的例子：
<?php
// launcher.php
require_once("ProcessesPool.php");
// The label identifies your process pool, it should be unique for your process launcher and your process children
$multi = new ProcessesPool($label = 'test');
// Initialize a new pool (creates the right directory or file, cleans a database or whatever you want)
// 10 is the maximum number of simultaneously run processes
if ($multi->create($max = '10') == false)
{
echo "Pool creation failed ...\n";
exit();
}
// We need to launch N processes, stored in $count
$count = 100; // maybe count($jobs)
// We execute all process, one by one
for ($i = 0; ($i < $count); $i++)
{
// The waitForResources method looks for how many processes are already run,
// and hangs until a resource is free or the maximum execution time is reached.
$ret = $multi->waitForResource($timeout = 10, $interval = 500000);
if ($ret)
{
// A resource is free, so we can run a new process
echo "Execute new process: $i\n";
exec("/usr/bin/php ./child.php $i > /dev/null &");
}
else
{
// Timeout is reached, we consider all children as dead and we kill them.
echo "WaitForResources Timeout! Killing zombies...\n";
$multi->killAllResources();
break;
}
}
// All process has been executed, but this does not mean they finished their work.
// This is important to follow the last executed processes to avoid zombies.
$ret = $multi->waitForTheEnd($timeout = 10, $interval = 500000);
if ($ret == false)
{
echo "WaitForTheEnd Timeout! Killing zombies...\n";
$multi->killAllResources();
}
// We destroy the process pool because we run all processes.
$multi->destroy();
echo "Finish.\n";
使用一个目录和多个文件进行同步
如果要使用目录方法（例如在/dev/ram1
分区上），则实现如下：
1create（）
将使用给定的$label
2start（）
在目录中创建一个文件，由子目录的pid命名
3finish（）
销毁孩子的文件
4waitForResources（）
统计该目录中的文件
5killAllResources（）
读取目录内容并杀死所有PID
6waitForTheEnd（）
读取目录，直到不再有文件为止
7destroy（）
删除目录
这种方法看起来成本很高，但如果您希望同时运行数百个任务，而不需要像执行作业那样多的数据库连接，那么它确实非常有效
实施：
PHP ProcessPoolFiles.PHP
<?php
// ProcessPoolFiles.php
class ProcessesPoolFiles extends AbstractProcessesPool
{
protected $_dir;
public function __construct($label, $dir)
{
parent::__construct($label);
if ((!is_dir($dir)) || (!is_writable($dir)))
{
throw new Exception("Directory '{$dir}' does not exist or is not writable.");
}
$sha1 = sha1($label);
$this->_dir = "{$dir}/pool_{$sha1}";
}
protected function _createPool()
{
if ((!is_dir($this->_dir)) && (!mkdir($this->_dir, 0777)))
{
throw new Exception("Could not create '{$this->_dir}'");
}
if ($this->_cleanPool() == false)
{
return false;
}
return true;
}
protected function _cleanPool()
{
$dh = opendir($this->_dir);
if ($dh == false)
{
return false;
}
while (($file = readdir($dh)) !== false)
{
if (($file != '.') && ($file != '..'))
{
if (unlink($this->_dir . '/' . $file) == false)
{
return false;
}
}
}
closedir($dh);
return true;
}
protected function _destroyPool()
{
if ($this->_cleanPool() == false)
{
return false;
}
if (!rmdir($this->_dir))
{
return false;
}
return true;
}
protected function _getPoolAge()
{
$age = -1;
$count = 0;
$dh = opendir($this->_dir);
if ($dh == false)
{
return false;
}
while (($file = readdir($dh)) !== false)
{
if (($file != '.') && ($file != '..'))
{
$stat = @stat($this->_dir . '/' . $file);
if ($stat['mtime'] > $age)
{
$age = $stat['mtime'];
}
$count++;
}
}
closedir($dh);
clearstatcache();
return (($count > 0) ? (@time() - $age) : (0));
}
protected function _countPid()
{
$count = 0;
$dh = opendir($this->_dir);
if ($dh == false)
{
return -1;
}
while (($file = readdir($dh)) !== false)
{
if (($file != '.') && ($file != '..'))
{
$count++;
}
}
closedir($dh);
return $count;
}
protected function _addPid($pid)
{
$file = $this->_dir . "/" . $pid;
if (is_file($file))
{
return true;
}
echo "{$file}\n";
$file = fopen($file, 'w');
if ($file == false)
{
return false;
}
fclose($file);
return true;
}
protected function _removePid($pid)
{
$file = $this->_dir . "/" . $pid;
if (!is_file($file))
{
return true;
}
if (unlink($file) == false)
{
return false;
}
return true;
}
protected function _getPidList()
{
$array = array ();
$dh = opendir($this->_dir);
if ($dh == false)
{
return false;
}
while (($file = readdir($dh)) !== false)
{
if (($file != '.') && ($file != '..'))
{
$array[] = $file;
}
}
closedir($dh);
return $array;
}
}
然后，实现将类似于：
1create（）
将在上表中插入新行
2start（）
在pid列表中插入pid
3finish（）
从pid列表中删除一个pid
4waitForResources（）
读取nb\u启动字段
5killAllResources（）
获取并杀死每个pid
6waitForTheEnd（）
挂起并定期检查，直到nb_等于0
7destroy（）
删除该行
实施：
PHP ProcessPoolMySql.PHP
<?php
// ProcessPoolMysql.php
class ProcessesPoolMySQL extends AbstractProcessesPool
{
protected $_sql;
public function __construct($label, PDO $sql)
{
parent::__construct($label);
$this->_sql = $sql;
$this->_label = sha1($label);
}
protected function _createPool()
{
$request = "
INSERT IGNORE INTO processes_pool
VALUES ( ?, ?, NULL, CURRENT_TIMESTAMP )
";
$this->_query($request, $this->_label, 0);
return $this->_cleanPool();
}
protected function _cleanPool()
{
$request = "
UPDATE processes_pool
SET
nb_launched = ?,
pid_list = NULL,
updated = CURRENT_TIMESTAMP
WHERE label = ?
";
$this->_query($request, 0, $this->_label);
return true;
}
protected function _destroyPool()
{
$request = "
DELETE FROM processes_pool
WHERE label = ?
";
$this->_query($request, $this->_label);
return true;
}
protected function _getPoolAge()
{
$request = "
SELECT (CURRENT_TIMESTAMP - updated) AS age
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($request, $this->_label);
if ($ret === null)
{
return -1;
}
return $ret['age'];
}
protected function _countPid()
{
$req = "
SELECT nb_launched AS nb
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($req, $this->_label);
if ($ret === null)
{
return -1;
}
return $ret['nb'];
}
protected function _addPid($pid)
{
$request = "
UPDATE processes_pool
SET
nb_launched = (nb_launched + 1),
pid_list = CONCAT_WS(',', (SELECT IF(LENGTH(pid_list) = 0, NULL, pid_list )), ?),
updated = CURRENT_TIMESTAMP
WHERE label = ?
";
$this->_query($request, $pid, $this->_label);
return true;
}
protected function _removePid($pid)
{
$req = "
UPDATE processes_pool
SET
nb_launched = (nb_launched - 1),
pid_list =
CONCAT_WS(',', (SELECT IF (LENGTH(
SUBSTRING_INDEX(pid_list, ',', (FIND_IN_SET(?, pid_list) - 1))) = 0, null,
SUBSTRING_INDEX(pid_list, ',', (FIND_IN_SET(?, pid_list) - 1)))), (SELECT IF (LENGTH(
SUBSTRING_INDEX(pid_list, ',', (-1 * ((LENGTH(pid_list) - LENGTH(REPLACE(pid_list, ',', ''))) + 1 - FIND_IN_SET(?, pid_list))))) = 0, null,
SUBSTRING_INDEX(pid_list, ',', (-1 * ((LENGTH(pid_list) - LENGTH(REPLACE(pid_list, ',', ''))) + 1 - FIND_IN_SET(?, pid_list))
)
)
)
)
),
updated = CURRENT_TIMESTAMP
WHERE label = ?";
$this->_query($req, $pid, $pid, $pid, $pid, $this->_label);
return true;
}
protected function _getPidList()
{
$req = "
SELECT pid_list
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($req, $this->_label);
if ($ret === null)
{
return false;
}
if ($ret['pid_list'] == null)
{
return array();
}
$pid_list = explode(',', $ret['pid_list']);
return $pid_list;
}
protected function _query($request)
{
$return = null;
$stmt = $this->_sql->prepare($request);
if ($stmt === false)
{
return $return;
}
$params = func_get_args();
array_shift($params);
if ($stmt->execute($params) === false)
{
return $return;
}
if (strncasecmp(trim($request), 'SELECT', 6) === 0)
{
$return = $stmt->fetch(PDO::FETCH_ASSOC);
}
return $return;
}
}
在更糟糕的情况下（我将sleep（rand（）%7+1）；
更改为sleep（rand（）%7+100）；
，这将提供：
KolyMac:TaskManager ninsuo$ php pool_files_launcher.php
Waiting for available resource ( test )...
Execute new process: 0
Waiting for available resource ( test )...
Execute new process: 1
Waiting for available resource ( test )...
Execute new process: 2
Waiting for available resource ( test )...
Execute new process: 3
Waiting for available resource ( test )...
Execute new process: 4
Waiting for available resource ( test )...
Execute new process: 5
Waiting for available resource ( test )...
Execute new process: 6
Waiting for available resource ( test )...
Execute new process: 7
Waiting for available resource ( test )...
Execute new process: 8
Waiting for available resource ( test )...
Execute new process: 9
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
(...)
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
WaitForResources Timeout! Killing zombies...
Waiting for all resources to finish ( test )...
Finish.
转到继续阅读此答案。第2页：SO答案的正文限制为30k字符，因此我需要创建一个新的正文
控制结果
不准搞错！
是的！您可以启动大量的进程，而无需考虑资源。但是，如果一个子进程失败怎么办？将有一个未完成或未完成的作业
事实上，这比控制流程执行更简单（简单得多）。我们有一个使用池执行的作业队列，我们只需要知道一个作业在执行后是否失败或成功。如果在执行整个池时出现失败，则失败的流程将放在一个新池中，并再次执行
如何在PHP中继续？
这一原理基于集群：队列包含多个作业，但只表示一个实体。集群的每个计算
应成功完成该实体
路线图：
1我们创建一个todo列表（与队列不匹配，用于流程管理），其中包含集群的所有计算。每个作业都有一个状态：等待（未执行）、运行（已执行和未完成）、成功和错误（根据其结果），当然，在这一步中，它们的状态是等待
2我们使用process manager运行所有作业（以保持对资源的控制），每个作业都以通知任务ma开始
<?php
// pool_files_launcher.php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolFiles.php");
$multi = new ProcessesPoolFiles($label = 'test', $dir = "/tmp");
if ($multi->create($max = '10') == false)
{
echo "Pool creation failed ...\n";
exit();
}
$count = 20;
for ($i = 0; ($i < $count); $i++)
{
$ret = $multi->waitForResource($timeout = 10, $interval = 500000, 'test_waitForResource');
if ($ret)
{
echo "Execute new process: $i\n";
exec("/usr/bin/php ./pool_files_calc.php $i > /dev/null &");
}
else
{
echo "WaitForResources Timeout! Killing zombies...\n";
$multi->killAllResources();
break;
}
}
$ret = $multi->waitForTheEnd($timeout = 10, $interval = 500000, 'test_waitForTheEnd');
if ($ret == false)
{
echo "WaitForTheEnd Timeout! Killing zombies...\n";
$multi->killAllResources();
}
$multi->destroy();
echo "Finish.\n";
function test_waitForResource($multi)
{
echo "Waiting for available resource ( {$multi->getLabel()} )...\n";
}
function test_waitForTheEnd($multi)
{
echo "Waiting for all resources to finish ( {$multi->getLabel()} )...\n";
}
<?php
// pool_files_calc.php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolFiles.php");
$multi = new ProcessesPoolFiles($label = 'test', $dir = "/tmp");
$multi->start();
// here I simulate job's execution
sleep(rand() % 7 + 1);
$multi->finish();
CREATE TABLE `processes_pool` (
`label` varchar(40) PRIMARY KEY,
`nb_launched` mediumint(6) unsigned NOT NULL,
`pid_list` varchar(2048) default NULL,
`updated` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
<?php
// ProcessPoolMysql.php
class ProcessesPoolMySQL extends AbstractProcessesPool
{
protected $_sql;
public function __construct($label, PDO $sql)
{
parent::__construct($label);
$this->_sql = $sql;
$this->_label = sha1($label);
}
protected function _createPool()
{
$request = "
INSERT IGNORE INTO processes_pool
VALUES ( ?, ?, NULL, CURRENT_TIMESTAMP )
";
$this->_query($request, $this->_label, 0);
return $this->_cleanPool();
}
protected function _cleanPool()
{
$request = "
UPDATE processes_pool
SET
nb_launched = ?,
pid_list = NULL,
updated = CURRENT_TIMESTAMP
WHERE label = ?
";
$this->_query($request, 0, $this->_label);
return true;
}
protected function _destroyPool()
{
$request = "
DELETE FROM processes_pool
WHERE label = ?
";
$this->_query($request, $this->_label);
return true;
}
protected function _getPoolAge()
{
$request = "
SELECT (CURRENT_TIMESTAMP - updated) AS age
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($request, $this->_label);
if ($ret === null)
{
return -1;
}
return $ret['age'];
}
protected function _countPid()
{
$req = "
SELECT nb_launched AS nb
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($req, $this->_label);
if ($ret === null)
{
return -1;
}
return $ret['nb'];
}
protected function _addPid($pid)
{
$request = "
UPDATE processes_pool
SET
nb_launched = (nb_launched + 1),
pid_list = CONCAT_WS(',', (SELECT IF(LENGTH(pid_list) = 0, NULL, pid_list )), ?),
updated = CURRENT_TIMESTAMP
WHERE label = ?
";
$this->_query($request, $pid, $this->_label);
return true;
}
protected function _removePid($pid)
{
$req = "
UPDATE processes_pool
SET
nb_launched = (nb_launched - 1),
pid_list =
CONCAT_WS(',', (SELECT IF (LENGTH(
SUBSTRING_INDEX(pid_list, ',', (FIND_IN_SET(?, pid_list) - 1))) = 0, null,
SUBSTRING_INDEX(pid_list, ',', (FIND_IN_SET(?, pid_list) - 1)))), (SELECT IF (LENGTH(
SUBSTRING_INDEX(pid_list, ',', (-1 * ((LENGTH(pid_list) - LENGTH(REPLACE(pid_list, ',', ''))) + 1 - FIND_IN_SET(?, pid_list))))) = 0, null,
SUBSTRING_INDEX(pid_list, ',', (-1 * ((LENGTH(pid_list) - LENGTH(REPLACE(pid_list, ',', ''))) + 1 - FIND_IN_SET(?, pid_list))
)
)
)
)
),
updated = CURRENT_TIMESTAMP
WHERE label = ?";
$this->_query($req, $pid, $pid, $pid, $pid, $this->_label);
return true;
}
protected function _getPidList()
{
$req = "
SELECT pid_list
FROM processes_pool
WHERE label = ?
";
$ret = $this->_query($req, $this->_label);
if ($ret === null)
{
return false;
}
if ($ret['pid_list'] == null)
{
return array();
}
$pid_list = explode(',', $ret['pid_list']);
return $pid_list;
}
protected function _query($request)
{
$return = null;
$stmt = $this->_sql->prepare($request);
if ($stmt === false)
{
return $return;
}
$params = func_get_args();
array_shift($params);
if ($stmt->execute($params) === false)
{
return $return;
}
if (strncasecmp(trim($request), 'SELECT', 6) === 0)
{
$return = $stmt->fetch(PDO::FETCH_ASSOC);
}
return $return;
}
}
<?php
// pool_mysql_launcher.php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$multi = new ProcessesPoolMySQL($label = 'test', $dbh);
if ($multi->create($max = '10') == false)
{
echo "Pool creation failed ...\n";
exit();
}
$count = 20;
for ($i = 0; ($i < $count); $i++)
{
$ret = $multi->waitForResource($timeout = 10, $interval = 500000, 'test_waitForResource');
if ($ret)
{
echo "Execute new process: $i\n";
exec("/usr/bin/php ./pool_mysql_calc.php $i > /dev/null &");
}
else
{
echo "WaitForResources Timeout! Killing zombies...\n";
$multi->killAllResources();
break;
}
}
$ret = $multi->waitForTheEnd($timeout = 10, $interval = 500000, 'test_waitForTheEnd');
if ($ret == false)
{
echo "WaitForTheEnd Timeout! Killing zombies...\n";
$multi->killAllResources();
}
$multi->destroy();
echo "Finish.\n";
function test_waitForResource($multi)
{
echo "Waiting for available resource ( {$multi->getLabel()} )...\n";
}
function test_waitForTheEnd($multi)
{
echo "Waiting for all resources to finish ( {$multi->getLabel()} )...\n";
}
<?php
// pool_mysql_calc.php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$multi = new ProcessesPoolMySQL($label = 'test', $dbh);
$multi->start();
// here I simulate job's execution
sleep(rand() % 7 + 1);
$multi->finish();
KolyMac:TaskManager ninsuo$ php pool_files_launcher.php
Waiting for available resource ( test )...
Execute new process: 0
Waiting for available resource ( test )...
Execute new process: 1
Waiting for available resource ( test )...
Execute new process: 2
Waiting for available resource ( test )...
Execute new process: 3
Waiting for available resource ( test )...
Execute new process: 4
Waiting for available resource ( test )...
Execute new process: 5
Waiting for available resource ( test )...
Execute new process: 6
Waiting for available resource ( test )...
Execute new process: 7
Waiting for available resource ( test )...
Execute new process: 8
Waiting for available resource ( test )...
Execute new process: 9
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Execute new process: 10
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Execute new process: 11
Waiting for available resource ( test )...
Execute new process: 12
Waiting for available resource ( test )...
Execute new process: 13
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Execute new process: 14
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Execute new process: 15
Waiting for available resource ( test )...
Execute new process: 16
Waiting for available resource ( test )...
Execute new process: 17
Waiting for available resource ( test )...
Execute new process: 18
Waiting for available resource ( test )...
Execute new process: 19
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Waiting for all resources to finish ( test )...
Finish.
KolyMac:TaskManager ninsuo$ php pool_files_launcher.php
Waiting for available resource ( test )...
Execute new process: 0
Waiting for available resource ( test )...
Execute new process: 1
Waiting for available resource ( test )...
Execute new process: 2
Waiting for available resource ( test )...
Execute new process: 3
Waiting for available resource ( test )...
Execute new process: 4
Waiting for available resource ( test )...
Execute new process: 5
Waiting for available resource ( test )...
Execute new process: 6
Waiting for available resource ( test )...
Execute new process: 7
Waiting for available resource ( test )...
Execute new process: 8
Waiting for available resource ( test )...
Execute new process: 9
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
(...)
Waiting for available resource ( test )...
Waiting for available resource ( test )...
Waiting for available resource ( test )...
WaitForResources Timeout! Killing zombies...
Waiting for all resources to finish ( test )...
Finish.
CREATE TABLE `tasks_manager` (
`cluster_label` varchar(40),
`calcul_label` varchar(40),
`status` enum('waiting', 'running', 'failed', 'success') default 'waiting',
`updated` timestamp NOT NULL default CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP,
PRIMARY KEY (`cluster_label`, `calcul_label`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
<?php
class TasksManager
{
protected $_cluster_label;
protected $_calcul_label;
protected $_sql;
const WAITING = "waiting";
const RUNNING = "running";
const SUCCESS = "success";
const FAILED = "failed";
public function __construct($label, PDO $sql)
{
$this->_sql = $sql;
$this->_cluster_label = substr($label, 0, 40);
}
public function getClusterLabel()
{
return $this->_cluster_label;
}
public function getCalculLabel()
{
return $this->_calcul_label;
}
public function destroy()
{
$request = "
DELETE FROM tasks_manager
WHERE cluster_label = ?
";
$this->_query($request, $this->_cluster_label);
return $this;
}
public function start($calcul_label)
{
$this->_calcul_label = $calcul_label;
$this->add($calcul_label, TasksManager::RUNNING);
return $this;
}
public function finish($status = TasksManager::SUCCESS)
{
if (!$this->_isStatus($status))
{
throw new Exception("{$status} is not a valid status.");
}
if (is_null($this->_cluster_label))
{
throw new Exception("finish() called, but task never started.");
}
$request = "
UPDATE tasks_manager
SET status = ?
WHERE cluster_label = ?
AND calcul_label = ?
";
$this->_query($request, $status, $this->_cluster_label, substr($this->_calcul_label, 0, 40));
return $this;
}
public function add($calcul_label, $status = TasksManager::WAITING)
{
if (!$this->_isStatus($status))
{
throw new Exception("{$status} is not a valid status.");
}
$request = "
INSERT INTO tasks_manager (
cluster_label, calcul_label, status
) VALUES (
?, ?, ?
)
ON DUPLICATE KEY UPDATE
status = ?
";
$calcul_label = substr($calcul_label, 0, 40);
$this->_query($request, $this->_cluster_label, $calcul_label, $status, $status);
return $this;
}
public function delete($calcul_label)
{
$request = "
DELETE FROM tasks_manager
WHERE cluster_label = ?
AND calcul_label = ?
";
$this->_query($request, $this->_cluster_label, substr($calcul_label, 0, 40));
return $this;
}
public function countStatus($status = TasksManager::SUCCESS)
{
if (!$this->_isStatus($status))
{
throw new Exception("{$status} is not a valid status.");
}
$request = "
SELECT COUNT(*) AS cnt
FROM tasks_manager
WHERE cluster_label = ?
AND status = ?
";
$ret = $this->_query($request, $this->_cluster_label, $status);
return $ret[0]['cnt'];
}
public function count()
{
$request = "
SELECT COUNT(id) AS cnt
FROM tasks_manager
WHERE cluster_label = ?
";
$ret = $this->_query($request, $this->_cluster_label);
return $ret[0]['cnt'];
}
public function getCalculsByStatus($status = TasksManager::SUCCESS)
{
if (!$this->_isStatus($status))
{
throw new Exception("{$status} is not a valid status.");
}
$request = "
SELECT calcul_label
FROM tasks_manager
WHERE cluster_label = ?
AND status = ?
";
$ret = $this->_query($request, $this->_cluster_label, $status);
$array = array();
if (!is_null($ret))
{
$array = array_map(function($row) {
return $row['calcul_label'];
}, $ret);
}
return $array;
}
public function switchStatus($statusA = TasksManager::RUNNING, $statusB = null)
{
if (!$this->_isStatus($statusA))
{
throw new Exception("{$statusA} is not a valid status.");
}
if ((!is_null($statusB)) && (!$this->_isStatus($statusB)))
{
throw new Exception("{$statusB} is not a valid status.");
}
if ($statusB != null)
{
$request = "
UPDATE tasks_manager
SET status = ?
WHERE cluster_label = ?
AND status = ?
";
$this->_query($request, $statusB, $this->_cluster_label, $statusA);
}
else
{
$request = "
UPDATE tasks_manager
SET status = ?
WHERE cluster_label = ?
";
$this->_query($request, $statusA, $this->_cluster_label);
}
return $this;
}
private function _isStatus($status)
{
if (!is_string($status))
{
return false;
}
return in_array($status, array(
self::FAILED,
self::RUNNING,
self::SUCCESS,
self::WAITING,
));
}
protected function _query($request)
{
$return = null;
$stmt = $this->_sql->prepare($request);
if ($stmt === false)
{
return $return;
}
$params = func_get_args();
array_shift($params);
if ($stmt->execute($params) === false)
{
return $return;
}
if (strncasecmp(trim($request), 'SELECT', 6) === 0)
{
$return = $stmt->fetchAll(PDO::FETCH_ASSOC);
}
return $return;
}
}
<?php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
require_once("TasksManager.php");
// Initializing database connection
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Initializing process pool
$pool = new ProcessesPoolMySQL($label = "pool test", $dbh);
$pool->create($max = "10");
// Initializing task manager
$multi = new TasksManager($label = "jobs test", $dbh);
$multi->destroy();
// Simulating jobs
$count = 20;
$todo_list = array ();
for ($i = 0; ($i < $count); $i++)
{
$todo_list[$i] = "Job {$i}";
$multi->add($todo_list[$i], TasksManager::WAITING);
}
// Infinite loop until all jobs are done
$continue = true;
while ($continue)
{
$continue = false;
echo "Starting to run jobs in queue ...\n";
// put all failed jobs to WAITING status
$multi->switchStatus(TasksManager::FAILED, TasksManager::WAITING);
foreach ($todo_list as $job)
{
$ret = $pool->waitForResource($timeout = 10, $interval = 500000, "waitResource");
if ($ret)
{
echo "Executing job: $job\n";
exec(sprintf("/usr/bin/php ./tasks_program.php %s > /dev/null &", escapeshellarg($job)));
}
else
{
echo "waitForResource timeout!\n";
$pool->killAllResources();
// All jobs currently running are considered dead, so, failed
$multi->switchStatus(TasksManager::RUNNING, TasksManager::FAILED);
break;
}
}
$ret = $pool->waitForTheEnd($timeout = 10, $interval = 500000, "waitEnd");
if ($ret == false)
{
echo "waitForTheEnd timeout!\n";
$pool->killAllResources();
// All jobs currently running are considered dead, so, failed
$multi->switchStatus(TasksManager::RUNNING, TasksManager::FAILED);
}
echo "All jobs in queue executed, looking for errors...\n";
// Counts if there is failures
$nb_failed = $multi->countStatus(TasksManager::FAILED);
if ($nb_failed > 0)
{
$todo_list = $multi->getCalculsByStatus(TasksManager::FAILED);
echo sprintf("%d jobs failed: %s\n", $nb_failed, implode(', ', $todo_list));
$continue = true;
}
}
function waitResource($multi)
{
echo "Waiting for a resource ....\n";
}
function waitEnd($multi)
{
echo "Waiting for the end .....\n";
}
// All jobs finished, destroying task manager
$multi->destroy();
// Destroying process pool
$pool->destroy();
echo "Finish.\n";
<?php
if (!isset($argv[1]))
{
die("This program must be called with an identifier (calcul_label)\n");
}
$calcul_label = $argv[1];
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
require_once("TasksManager.php");
// Initializing database connection
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Initializing process pool (with same label as parent)
$pool = new ProcessesPoolMySQL($label = "pool test", $dbh);
// Takes one resource in pool
$pool->start();
// Initializing task manager (with same label as parent)
$multi = new TasksManager($label = "jobs test", $dbh);
$multi->start($calcul_label);
// Simulating execution time
$secs = (rand() % 2) + 3;
sleep($secs);
// Simulating job status
$status = rand() % 3 == 0 ? TasksManager::FAILED : TasksManager::SUCCESS;
// Job finishes indicating his status
$multi->finish($status);
// Releasing pool's resource
$pool->finish();
mkfs -q /dev/ram1 65536
mkdir -p /ram
mount /dev/ram1 /ram
<?php
class Synchro
{
private $_file;
public function __construct($file)
{
$this->_file = $file;
}
public function __get($property)
{
// File does not exist
if (!is_file($this->_file))
{
return null;
}
// Check if file is readable
if ((is_file($this->_file)) && (!is_readable($this->_file)))
{
throw new Exception(sprintf("File '%s' is not readable.", $this->_file));
}
// Open file with advisory lock option enabled for reading and writting
if (($fd = fopen($this->_file, 'c+')) === false)
{
throw new Exception(sprintf("Can't open '%s' file.", $this->_file));
}
// Request a lock for reading (hangs until lock is granted successfully)
if (flock($fd, LOCK_SH) === false)
{
throw new Exception(sprintf("Can't lock '%s' file for reading.", $this->_file));
}
// A hand-made file_get_contents
$contents = '';
while (($read = fread($fd, 32 * 1024)) !== '')
{
$contents .= $read;
}
// Release shared lock and close file
flock($fd, LOCK_UN);
fclose($fd);
// Restore shared data object and return requested property
$object = json_decode($contents);
if (property_exists($object, $property))
{
return $object->{$property};
}
return null;
}
public function __set($property, $value)
{
// Check if directory is writable if file does not exist
if ((!is_file($this->_file)) && (!is_writable(dirname($this->_file))))
{
throw new Exception(sprintf("Directory '%s' does not exist or is not writable.", dirname($this->_file)));
}
// Check if file is writable if it exists
if ((is_file($this->_file)) && (!is_writable($this->_file)))
{
throw new Exception(sprintf("File '%s' is not writable.", $this->_file));
}
// Open file with advisory lock option enabled for reading and writting
if (($fd = fopen($this->_file, 'c+')) === false)
{
throw new Exception(sprintf("Can't open '%s' file.", $this->_file));
}
// Request a lock for writting (hangs until lock is granted successfully)
if (flock($fd, LOCK_EX) === false)
{
throw new Exception(sprintf("Can't lock '%s' file for writing.", $this->_file));
}
// A hand-made file_get_contents
$contents = '';
while (($read = fread($fd, 32 * 1024)) !== '')
{
$contents .= $read;
}
// Restore shared data object and set value for desired property
if (empty($contents))
{
$object = new stdClass();
}
else
{
$object = json_decode($contents);
}
$object->{$property} = $value;
// Go back at the beginning of file
rewind($fd);
// Truncate file
ftruncate($fd, strlen($contents));
// Save shared data object to the file
fwrite($fd, json_encode($object));
// Release exclusive lock and close file
flock($fd, LOCK_UN);
fclose($fd);
return $value;
}
}
<?php
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
require_once("TasksManager.php");
require_once("Synchro.php");
// Removing old synchroized object
if (is_file("/tmp/synchro.txt"))
{
unlink("/tmp/synchro.txt");
}
// Initializing database connection
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Initializing process pool
$pool = new ProcessesPoolMySQL($label = "synchro pool", $dbh);
$pool->create($max = "10");
// Initializing task manager
$multi = new TasksManager($label = "synchro tasks", $dbh);
$multi->destroy();
// Simulating jobs
$todo_list = array ();
for ($i = 1; ($i <= 20); $i++)
{
$todo_list[$i] = $i;
$multi->add($todo_list[$i], TasksManager::WAITING);
}
// Infinite loop until all jobs are done
$continue = true;
while ($continue)
{
$continue = false;
echo "Starting to run jobs in queue ...\n";
// Shuffle all jobs (else this will be too easy :-))
shuffle($todo_list);
// put all failed jobs to WAITING status
$multi->switchStatus(TasksManager::FAILED, TasksManager::WAITING);
foreach ($todo_list as $job)
{
$ret = $pool->waitForResource($timeout = 10, $interval = 500000, "waitResource");
if ($ret)
{
echo "Executing job: $job\n";
exec(sprintf("/usr/bin/php ./synchro_program.php %s > /dev/null &", escapeshellarg($job)));
}
else
{
echo "waitForResource timeout!\n";
$pool->killAllResources();
// All jobs currently running are considered dead, so, failed
$multi->switchStatus(TasksManager::RUNNING, TasksManager::FAILED);
break;
}
}
$ret = $pool->waitForTheEnd($timeout = 10, $interval = 500000, "waitEnd");
if ($ret == false)
{
echo "waitForTheEnd timeout!\n";
$pool->killAllResources();
// All jobs currently running are considered dead, so, failed
$multi->switchStatus(TasksManager::RUNNING, TasksManager::FAILED);
}
echo "All jobs in queue executed, looking for errors...\n";
// Counts if there is failures
$multi->switchStatus(TasksManager::WAITING, TasksManager::FAILED);
$nb_failed = $multi->countStatus(TasksManager::FAILED);
if ($nb_failed > 0)
{
$todo_list = $multi->getCalculsByStatus(TasksManager::FAILED);
echo sprintf("%d jobs failed: %s\n", $nb_failed, implode(', ', $todo_list));
$continue = true;
}
}
function waitResource($multi)
{
echo "Waiting for a resource ....\n";
}
function waitEnd($multi)
{
echo "Waiting for the end .....\n";
}
// All jobs finished, destroying task manager
$multi->destroy();
// Destroying process pool
$pool->destroy();
// Recovering final result
$synchro = new Synchro("/tmp/synchro.txt");
echo sprintf("Result of the sum of all numbers between 1 and 20 included is: %d\n", $synchro->result20);
echo "Finish.\n";
<?php
if (!isset($argv[1]))
{
die("This program must be called with an identifier (calcul_label)\n");
}
$current_id = $argv[1];
require_once("AbstractProcessesPool.php");
require_once("ProcessesPoolMySQL.php");
require_once("TasksManager.php");
require_once("Synchro.php");
// Initializing database connection
$dbh = new PDO("mysql:host=127.0.0.1;dbname=fuz", 'root', 'root');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Initializing process pool (with same label as parent)
$pool = new ProcessesPoolMySQL($label = "synchro pool", $dbh);
// Takes one resource in pool
$pool->start();
// Initializing task manager (with same label as parent)
$multi = new TasksManager($label = "synchro tasks", $dbh);
$multi->start($current_id);
// ------------------------------------------------------
// Job begins here
$synchro = new Synchro("/tmp/synchro.txt");
if ($current_id == 1)
{
$synchro->result1 = 1;
$status = TasksManager::SUCCESS;
}
else
{
$previous_id = $current_id - 1;
if (is_null($synchro->{"result{$previous_id}"}))
{
$status = TasksManager::FAILED;
}
else
{
$synchro->{"result{$current_id}"} = $synchro->{"result{$previous_id}"} + $current_id;
$status = TasksManager::SUCCESS;
}
}
// ------------------------------------------------------
// Job finishes indicating his status
$multi->finish($status);
// Releasing pool's resource
$pool->finish();