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vendor/symfony/http-client/RetryableHttpClient.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\HttpClient;
+
+use Psr\Log\LoggerInterface;
+use Psr\Log\NullLogger;
+use Symfony\Component\HttpClient\Response\AsyncContext;
+use Symfony\Component\HttpClient\Response\AsyncResponse;
+use Symfony\Component\HttpClient\Retry\GenericRetryStrategy;
+use Symfony\Component\HttpClient\Retry\RetryStrategyInterface;
+use Symfony\Contracts\HttpClient\ChunkInterface;
+use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
+use Symfony\Contracts\HttpClient\HttpClientInterface;
+use Symfony\Contracts\HttpClient\ResponseInterface;
+use Symfony\Contracts\Service\ResetInterface;
+
+/**
+ * Automatically retries failing HTTP requests.
+ *
+ * @author Jérémy Derussé <jeremy@derusse.com>
+ */
+class RetryableHttpClient implements HttpClientInterface, ResetInterface
+{
+    use AsyncDecoratorTrait;
+
+    private $strategy;
+    private $maxRetries;
+    private $logger;
+
+    /**
+     * @param int $maxRetries The maximum number of times to retry
+     */
+    public function __construct(HttpClientInterface $client, ?RetryStrategyInterface $strategy = null, int $maxRetries = 3, ?LoggerInterface $logger = null)
+    {
+        $this->client = $client;
+        $this->strategy = $strategy ?? new GenericRetryStrategy();
+        $this->maxRetries = $maxRetries;
+        $this->logger = $logger ?? new NullLogger();
+    }
+
+    public function request(string $method, string $url, array $options = []): ResponseInterface
+    {
+        if ($this->maxRetries <= 0) {
+            return new AsyncResponse($this->client, $method, $url, $options);
+        }
+
+        $retryCount = 0;
+        $content = '';
+        $firstChunk = null;
+
+        return new AsyncResponse($this->client, $method, $url, $options, function (ChunkInterface $chunk, AsyncContext $context) use ($method, $url, $options, &$retryCount, &$content, &$firstChunk) {
+            $exception = null;
+            try {
+                if ($context->getInfo('canceled') || $chunk->isTimeout() || null !== $chunk->getInformationalStatus()) {
+                    yield $chunk;
+
+                    return;
+                }
+            } catch (TransportExceptionInterface $exception) {
+                // catch TransportExceptionInterface to send it to the strategy
+            }
+            if (null !== $exception) {
+                // always retry request that fail to resolve DNS
+                if ('' !== $context->getInfo('primary_ip')) {
+                    $shouldRetry = $this->strategy->shouldRetry($context, null, $exception);
+                    if (null === $shouldRetry) {
+                        throw new \LogicException(sprintf('The "%s::shouldRetry()" method must not return null when called with an exception.', \get_class($this->strategy)));
+                    }
+
+                    if (false === $shouldRetry) {
+                        yield from $this->passthru($context, $firstChunk, $content, $chunk);
+
+                        return;
+                    }
+                }
+            } elseif ($chunk->isFirst()) {
+                if (false === $shouldRetry = $this->strategy->shouldRetry($context, null, null)) {
+                    yield from $this->passthru($context, $firstChunk, $content, $chunk);
+
+                    return;
+                }
+
+                // Body is needed to decide
+                if (null === $shouldRetry) {
+                    $firstChunk = $chunk;
+                    $content = '';
+
+                    return;
+                }
+            } else {
+                if (!$chunk->isLast()) {
+                    $content .= $chunk->getContent();
+
+                    return;
+                }
+
+                if (null === $shouldRetry = $this->strategy->shouldRetry($context, $content, null)) {
+                    throw new \LogicException(sprintf('The "%s::shouldRetry()" method must not return null when called with a body.', \get_class($this->strategy)));
+                }
+
+                if (false === $shouldRetry) {
+                    yield from $this->passthru($context, $firstChunk, $content, $chunk);
+
+                    return;
+                }
+            }
+
+            $context->getResponse()->cancel();
+
+            $delay = $this->getDelayFromHeader($context->getHeaders()) ?? $this->strategy->getDelay($context, !$exception && $chunk->isLast() ? $content : null, $exception);
+            ++$retryCount;
+            $content = '';
+            $firstChunk = null;
+
+            $this->logger->info('Try #{count} after {delay}ms'.($exception ? ': '.$exception->getMessage() : ', status code: '.$context->getStatusCode()), [
+                'count' => $retryCount,
+                'delay' => $delay,
+            ]);
+
+            $context->setInfo('retry_count', $retryCount);
+            $context->replaceRequest($method, $url, $options);
+            $context->pause($delay / 1000);
+
+            if ($retryCount >= $this->maxRetries) {
+                $context->passthru();
+            }
+        });
+    }
+
+    private function getDelayFromHeader(array $headers): ?int
+    {
+        if (null !== $after = $headers['retry-after'][0] ?? null) {
+            if (is_numeric($after)) {
+                return (int) ($after * 1000);
+            }
+
+            if (false !== $time = strtotime($after)) {
+                return max(0, $time - time()) * 1000;
+            }
+        }
+
+        return null;
+    }
+
+    private function passthru(AsyncContext $context, ?ChunkInterface $firstChunk, string &$content, ChunkInterface $lastChunk): \Generator
+    {
+        $context->passthru();
+
+        if (null !== $firstChunk) {
+            yield $firstChunk;
+        }
+
+        if ('' !== $content) {
+            $chunk = $context->createChunk($content);
+            $content = '';
+
+            yield $chunk;
+        }
+
+        yield $lastChunk;
+    }
+}