FOS\HttpCache\ProxyClient\Http\HttpAdapter

Complexity

Total Complexity

32

Size/Duplication

Total Lines	264
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	12

Test Coverage

Coverage

94.85%

Importance

Changes	4
Bugs	0	Features	0

8 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	6	1
A	invalidate()	0	10	2
D	flush()	0	37	9
C	fanOut()	0	50	9
A	setServers()	0	7	2
A	setBaseUri()	0	10	2
B	filterUri()	0	29	6
A	getRequestSignature()	0	7	1

<?php

namespace FOS\HttpCache\ProxyClient\Http;

use FOS\HttpCache\Exception\ExceptionCollection;
use FOS\HttpCache\Exception\InvalidArgumentException;
use FOS\HttpCache\Exception\InvalidUrlException;
use FOS\HttpCache\Exception\ProxyResponseException;
use FOS\HttpCache\Exception\ProxyUnreachableException;
use Http\Client\Exception;
use Http\Client\Exception\HttpException;
use Http\Client\Exception\RequestException;
use Http\Client\HttpAsyncClient;
use Http\Promise\Promise;
use Http\Discovery\UriFactoryDiscovery;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\UriInterface;

/**
 * An adapter to work with the Httplug asynchronous client.
 *
 * @author David Buchmann <mail@davidbu.ch>
 */
class HttpAdapter
{
    /**
     * @var HttpAsyncClient
     */
    private $httpClient;

    /**
     * Queued requests
     *
     * @var RequestInterface[]
     */
    private $queue = [];

    /**
     * Caching proxy server host names or IP addresses.
     *
     * @var UriInterface[]
     */
    private $servers;

    /**
     * Application host name and optional base URL.
     *
     * @var UriInterface
     */
    private $baseUri;

    /**
     * @param string[] $servers Caching proxy server hostnames or IP
     *                          addresses, including port if not port 80.
     *                          E.g. ['127.0.0.1:6081']
     * @param string   $baseUri Default application hostname, optionally
     *                          including base URL, for purge and refresh
     *                          requests (optional). This is required if
     *                          you purge and refresh paths instead of
     *                          absolute URLs.
     * @param HttpAsyncClient $httpClient
     */
    public function __construct(array $servers, $baseUri, HttpAsyncClient $httpClient)
    {
        $this->setServers($servers);
        $this->setBaseUri($baseUri);
        $this->httpClient = $httpClient;
    }

    /**
     * Queue invalidation request.
     *
     * @param RequestInterface $invalidationRequest
     */
    public function invalidate(RequestInterface $invalidationRequest)
    {
        $signature = $this->getRequestSignature($invalidationRequest);

        if (isset($this->queue[$signature])) {
            return;
        }

        $this->queue[$signature] = $invalidationRequest;
    }

    /**
     * Send all pending invalidation requests and make sure the requests have terminated and gather exceptions.
     *
     * @return int The number of cache invalidations performed per caching server.
     *
     * @throws ExceptionCollection If any errors occurred during flush.
     */
    public function flush()
    {
        $queue = $this->queue;
        $this->queue = [];
        /** @var Promise[] $promises */
        $promises = [];

        $exceptions = new ExceptionCollection();

        foreach ($queue as $request) {
            foreach ($this->fanOut($request) as $proxyRequest) {
                $promises[] = $this->httpClient->sendAsyncRequest($proxyRequest);
            }
        }

        if (count($exceptions)) {
            throw new ExceptionCollection($exceptions);

$exceptions is of type object<FOS\HttpCache\Exception\ExceptionCollection>, but the function expects a array.

        }

        foreach ($promises as $promise) {
            try {
                $promise->wait();
            } catch (HttpException $exception) {
                $exceptions->add(ProxyResponseException::proxyResponse($exception->getResponse()));
            } catch (RequestException $exception) {
                $exceptions->add(ProxyUnreachableException::proxyUnreachable($exception));
            } catch (\Exception $exception)  {
                    $exceptions->add(new InvalidArgumentException($exception));
            }
        }

        if (count($exceptions)) {
            throw $exceptions;
        }

        return count($queue);
    }

    /**
     * Duplicate a request for each caching server
     *
     * @param RequestInterface $request The request to duplicate for each configured server
     *
     * @return RequestInterface[]
     */
    private function fanOut(RequestInterface $request)
    {
        $requests = [];

        $uri = $request->getUri();

        // If a base URI is configured, try to make partial invalidation
        // requests complete.
        if ($this->baseUri) {
            if ($uri->getHost()) {
                // Absolute URI: does it already have a scheme?
                if (!$uri->getScheme() && $this->baseUri->getScheme() !== '') {
                    $uri = $uri->withScheme($this->baseUri->getScheme());
                }
            } else {
                // Relative URI
                if ($this->baseUri->getHost() !== '') {
                    $uri = $uri->withHost($this->baseUri->getHost());
                }

                if ($this->baseUri->getPort()) {

The expression $this->baseUri->getPort() of type null|integer is loosely compared to true; this is ambiguous if the integer can be zero. You might want to explicitly use !== null instead.

                    $uri = $uri->withPort($this->baseUri->getPort());
                }

                // Base path
                if ($this->baseUri->getPath() !== '') {
                    $path = $this->baseUri->getPath() . '/' . ltrim($uri->getPath(), '/');
                    $uri = $uri->withPath($path);
                }
            }
        }

        // Close connections to make sure invalidation (PURGE/BAN) requests
        // will not interfere with content (GET) requests.
        $request = $request->withUri($uri)->withHeader('Connection', 'Close');

        // Create a request to each caching proxy server
        foreach ($this->servers as $server) {
            $requests[] = $request->withUri(
                $uri
                    ->withScheme($server->getScheme())
                    ->withHost($server->getHost())
                    ->withPort($server->getPort())
                ,
                true    // Preserve application Host header
            );
        }

        return $requests;
    }

    /**
     * Set caching proxy server URI objects, validating them.
     *
     * @param string[] $servers Caching proxy proxy server hostnames or IP
     *                          addresses, including port if not port 80.
     *                          E.g. ['127.0.0.1:6081']
     *
     * @throws InvalidUrlException If server is invalid or contains URL
     *                             parts other than scheme, host, port
     */
    private function setServers(array $servers)
    {
        $this->servers = [];
        foreach ($servers as $server) {
            $this->servers[] = $this->filterUri($server, ['scheme', 'host', 'port']);
        }
    }

    /**
     * Set application base URI that will be prefixed to relative purge and
     * refresh requests, and validate it.
     *
     * @param string $uriString Your application’s base URI
     *
     * @throws InvalidUrlException If the base URI is not a valid URI.
     */
    private function setBaseUri($uriString = null)
    {
        if (null === $uriString) {
            $this->baseUri = null;

            return;
        }

        $this->baseUri = $this->filterUri($uriString);
    }

    /**
     * Filter a URL
     *
     * Prefix the URL with "http://" if it has no scheme, then check the URL
     * for validity. You can specify what parts of the URL are allowed.
     *
     * @param string       $uriString
     * @param string[]     $allowedParts Array of allowed URL parts (optional)
     *
     * @return UriInterface Filtered URI (with default scheme if there was no scheme)
     *
     * @throws InvalidUrlException If URL is invalid, the scheme is not http or
     *                             contains parts that are not expected.
     */
    private function filterUri($uriString, array $allowedParts = [])
    {
        // Creating a PSR-7 URI without scheme (with parse_url) results in the
        // original hostname to be seen as path. So first add a scheme if none
        // is given.
        if (false === strpos($uriString, '://')) {
            $uriString = sprintf('%s://%s', 'http', $uriString);
        }

        try {
            $uri = UriFactoryDiscovery::find()->createUri($uriString);
        } catch (\InvalidArgumentException $e) {
            throw InvalidUrlException::invalidUrl($uriString);
        }

        if (!$uri->getScheme()) {
            throw InvalidUrlException::invalidUrl($uriString, 'empty scheme');
        }

        if (count($allowedParts) > 0) {
            $parts = parse_url((string) $uri);
            $diff = array_diff(array_keys($parts), $allowedParts);
            if (count($diff) > 0) {
                throw InvalidUrlException::invalidUrlParts($uriString, $allowedParts);
            }
        }

        return $uri;
    }

    /**
     * Build a request signature based on the request data. Unique for every different request, identical
     * for the same requests.
     *
     * This signature is used to avoid sending the same invalidation request twice.
     *
     * @param RequestInterface $request An invalidation request.
     *
     * @return string A signature for this request.
     */
    private function getRequestSignature(RequestInterface $request)
    {
        $headers = $request->getHeaders();
        ksort($headers);

        return md5($request->getMethod(). "\n" . $request->getUri(). "\n" . var_export($headers, true));
    }
}