Swoole Reflection API

This library provides a Reflection API for classes of Swoole / Open Swoole web-server.

Features:

Server middleware manipulation
Response lifecycle tracking

Installation

The library is to be installed via Composer as a dependency:

composer require upscale/swoole-reflection

Usage

Middleware Manipulation

Override server middleware optionally reusing the original callback:

$server = new \Swoole\Http\Server('127.0.0.1', 8080);
$server->on('request', function ($request, $response) {
   $response->end("Served by Swoole server\n");
});

$reflection = new \Upscale\Swoole\Reflection\Http\Server($server);
$middleware = $reflection->getMiddleware();
$reflection->setMiddleware(function ($request, $response) use ($middleware) {
   $response->header('Content-Type', 'text/plain');
   $middleware($request, $response);
});

$server->start();

Response Lifecycle

Headers Tracking

Modify response headers before they have been sent:

$server->on('request', function ($request, $response) {
    $callback = function () use ($request, $response) {
        $response->header('Content-Type', 'text/plain');
    };
    $response = new \Upscale\Swoole\Reflection\Http\Response\Observable($response);
    $response->onHeadersSentBefore($callback);    
    $response->end("Served by Swoole server\n");
});

Callback is invoked on every request upon the first call to \Swoole\Http\Response::write/end/sendfile().

Warning! Callbacks that need to modify response must use the original response rather than its observable proxy. Dependency on observable proxy creates circular reference between the proxy and callbacks registered within it. Instances involved in orphan circular cross-references will not be destroyed until the next garbage collection cycle. Swoole calls \Swoole\Http\Response::end() in the response destructor executed upon the request completion. The response destructor will not be called causing the the worker to hang up without sending the response.

Body Interception

Modify response body before sending it out:

$server->on('request', function ($request, $response) use ($server) {
    $response = new \Upscale\Swoole\Reflection\Http\Response\Observable($response);
    $response->onBodyAppend(function (&$content) use ($server) {
        $content .= "<!-- Served by worker {$server->worker_id} -->\n";
    });
    $response->header('Content-Type', 'text/html');
    $response->end("Served by <b>Swoole server</b>\n");
});

Callback is invoked on every call to \Swoole\Http\Response::write/end() with non-empty contents.

Contributing

Pull Requests with fixes and improvements are welcome!

License

Licensed under the Apache License, Version 2.0.

upscalesoftware / swoole-reflection

readme