之前在工作中使用 Laravel Octane 的 concurrently 处理并发时,发现在队列和定时任务中不会触发并发效果。经过分析,作了如下猜测:队列和定时任务都属于一个独立的进程,与 Octane 服务无关,而 Octane concurrently 恰恰需要在 Octane 环境下才能运行。
后来通过代码进行环境检测和查看 php 的进程,证明猜想成立。
php
info('check env', [
'served by octane' => isset($_SERVER['LARAVEL_OCTANE']) && ((int)$_SERVER['LARAVEL_OCTANE'] === 1),
'on swoole server' => (extension_loaded('swoole') || extension_loaded('openswoole')) && app()->bound(Server::class)
]);
为了能够在任意代码中实现并发,我们研究参考了 Hyperf 框架关于协程的代码,然后抽取了如下两个类:
php
<?php
namespace App\Services;
use App\Exceptions\ParallelExecutionException;
use Laravel\Octane\Facades\Octane;
use Throwable;
use Swoole\Coroutine as Co;
class Parallel
{
protected array $callbacks = [];
protected array $results = [];
/**
* @var Throwable[]
*/
protected array $throwables = [];
public function add(callable $callable, $key = null): void
{
if (is_null($key)) {
$this->callbacks[] = $callable;
} else {
$this->callbacks[$key] = $callable;
}
}
public function wait(bool $throw = true): array
{
if (isset($_SERVER['LARAVEL_OCTANE']) && ((int)$_SERVER['LARAVEL_OCTANE'] === 1)) {
return Octane::concurrently($this->callbacks, 300000);
}
app('log')->useLoggingLoopDetection(false);
Co\run(function () {
foreach ($this->callbacks as $key => $callback) {
Co::create(function () use ($callback, $key) {
try {
$this->results[$key] = $callback();
} catch (Throwable $throwable) {
$this->throwables[$key] = $throwable;
unset($this->results[$key]);
}
});
}
});
if ($throw && ($throwableCount = count($this->throwables)) > 0) {
$message = 'Detecting ' . $throwableCount . ' throwable occurred during parallel execution:' . PHP_EOL . $this->formatThrowAbles($this->throwables);
$executionException = new ParallelExecutionException($message);
$executionException->setResults($this->results);
$executionException->setThrowAbles($this->throwables);
unset($this->results, $this->throwables);
throw $executionException;
}
app('log')->useLoggingLoopDetection(true);
return $this->results;
}
private function formatThrowAbles(array $throwables): string
{
$output = '';
foreach ($throwables as $key => $value) {
$output .= sprintf('(%s) %s: %s' . PHP_EOL . '%s' . PHP_EOL, $key, get_class($value), $value->getMessage(), $value->getTraceAsString());
}
return $output;
}
}
php
<?php
namespace App\Exceptions;
use RuntimeException;
class ParallelExecutionException extends RuntimeException
{
protected array $results = [];
protected array $throwables = [];
public function getResults(): array
{
return $this->results;
}
public function setResults(array $results): void
{
$this->results = $results;
}
public function getThrowAbles(): array
{
return $this->throwables;
}
public function setThrowAbles(array $throwables): array
{
return $this->throwables = $throwables;
}
}
其中,第一个类的作用是检测系统是否运行在 Octane 环境下,是则调用Octane concurrently,否则就执行 Swoole 协程代码,使用起来也比较简单:
php
$parallel = new Parallel();
$parallel->add(fn() => $this->analysisStructure(), 'structure');
$parallel->add(fn() => $this->analysisHabit(), 'habit');
[
'structure' => $structure,
'habit' => $habit,
] = $parallel->wait();
之所以没有完全使用 Swoole 协程,是因为相比之下,Octane 代码更加优雅,我们在期待着某天更新后,Octane concurrently 也能直接在队列中运行使用。
第二个类的作用比较简单,就是对协程中异常的一个定义。
另外在分析过程中,我们也发现了一个比较有意思的事情:
如图所示,当我在路由中运行检测代码时,Octane 和 Swoole Server 都为 true;在控制器中运行检测代码时,又只有 Octane 为true;为什么会有这样的区分?我个人猜测是 Octane 在将框架代码读进内存时,特意跳过了控制器中的代码,以避免数据更新不及时等问题。
有知道具体原因的小伙伴,欢迎留言探讨。