Add the React\Http\Client adapter

It rely on react defered logic to handle asyncRequest and is able to mute a PSR7 request to a React Request. Then it take care of react request execution by listening all required events and processing de defered accordingly.

Author: shulard

src/ReactHttpClient.php

@@ -0,0 +1,151 @@
+<?php
+
+namespace Http\Adapter;
+
+use React\EventLoop\LoopInterface;
+use React\Promise\Deferred;
+use React\HttpClient\Client;
+use React\HttpClient\Request as ReactRequest;
+use React\HttpClient\Response as ReactResponse;
+
+use Http\Client\HttpClient;
+use Http\Client\HttpAsyncClient;
+use Http\Client\Promise;
+use Http\Client\Exception\HttpException;
+use Http\Client\Exception\RequestException;
+use Http\Message\MessageFactory;
+
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\StreamInterface;
+
+/**
+ * Client for the React promise implementation
+ * @author Stéphane Hulard <[email protected]>
+ */
+class ReactHttpClient implements HttpClient, HttpAsyncClient
+{
+    /**
+     * React HTTP client
+     * @var Client
+     */
+    private $client;
+
+    /**
+     * React event loop
+     * @var LoopInterface
+     */
+    private $loop;
+
+    /**
+     * Initialize the React client
+     * @param LoopInterface|null $loop     React Event loop
+     * @param Resolver           $resolver React async DNS resolver
+     */
+    public function __construct(
+        MessageFactory $messageFactory,
+        LoopInterface $loop = null,
+        Client $client = null
+    ) {
+        $this->loop = null === $loop?ReactFactory::buildEventLoop():$loop;
+        if( null === $client ) {
+            $this->client = ReactFactory::buildHttpClient($this->loop);
+        } elseif( null === $loop ) {
+            throw new \RuntimeException(
+                "You must give a LoopInterface instance with the Client"
+            );
+        }
+
+        $this->messageFactory = new ReactMessageFactory($messageFactory);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function sendRequest(RequestInterface $request)
+    {
+        $promise = $this->sendAsyncRequest($request);
+        $promise->wait();
+
+        if ($promise->getState() == Promise::REJECTED) {
+            throw $promise->getException();
+        }
+
+        return $promise->getResponse();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function sendAsyncRequest(RequestInterface $request)
+    {
+        $requestStream = $this->buildReactRequest($request);
+        $deferred = new Deferred();
+
+        $requestStream->on('error', function(\Exception $error) use ($deferred, $request) {
+            $deferred->reject(new RequestException(
+                $error->getMessage(),
+                $request,
+                $error
+            ));
+        });
+        $requestStream->on('response', function(ReactResponse $response = null) use ($deferred, $requestStream, $request) {
+            $bodyStream = null;
+            $response->on('data', function($data) use (&$bodyStream) {
+                if( $data instanceof StreamInterface ) {
+                    $bodyStream = $data;
+                } else {
+                    $bodyStream->write($data);
+                }
+            });
+
+            $response->on('end', function(\Exception $error = null) use ($deferred, $request, $response, &$bodyStream) {
+                $bodyStream->rewind();
+                $psr7Response = $this->messageFactory->buildResponse(
+                    $response,
+                    $bodyStream
+                );
+                if( null !== $error ) {
+                    $deferred->reject(new HttpException(
+                        $error->getMessage(),
+                        $request,
+                        $psr7Response,
+                        $error
+                    ));
+                } else {
+                    $deferred->resolve($psr7Response);
+                }
+            });
+        });
+
+        $requestStream->end((string)$request->getBody());
+
+        $promise = new ReactPromiseAdapter($deferred->promise());
+        $promise->setLoop($this->loop);
+        return $promise;
+    }
+
+    /**
+     * Build a React request from the PSR7 RequestInterface
+     * @param  RequestInterface $request
+     * @return ReactRequest
+     */
+    private function buildReactRequest(RequestInterface $request)
+    {
+        $headers = [];
+        foreach( $request->getHeaders() as $name => $value ) {
+            $headers[$name] = (is_array($value)?$value[0]:$value);
+        }
+        if( $request->getBody()->getSize() > 0 ) {
+            $headers['Content-Length'] = $request->getBody()->getSize();
+        }
+
+        $reactRequest = $this->client->request(
+            $request->getMethod(),
+            (string)$request->getUri(),
+            $headers,
+            $request->getProtocolVersion()
+        );
+
+        return $reactRequest;
+    }
+}