473 lines
16 KiB
PHP
473 lines
16 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\HttpClient\Response;
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use Symfony\Component\HttpClient\Chunk\ErrorChunk;
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use Symfony\Component\HttpClient\Chunk\FirstChunk;
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use Symfony\Component\HttpClient\Chunk\LastChunk;
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use Symfony\Component\HttpClient\Exception\TransportException;
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use Symfony\Contracts\HttpClient\ChunkInterface;
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use Symfony\Contracts\HttpClient\Exception\ExceptionInterface;
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use Symfony\Contracts\HttpClient\Exception\HttpExceptionInterface;
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use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
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use Symfony\Contracts\HttpClient\HttpClientInterface;
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use Symfony\Contracts\HttpClient\ResponseInterface;
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/**
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* Provides a single extension point to process a response's content stream.
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*
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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final class AsyncResponse implements ResponseInterface, StreamableInterface
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{
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use CommonResponseTrait;
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private const FIRST_CHUNK_YIELDED = 1;
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private const LAST_CHUNK_YIELDED = 2;
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private ?HttpClientInterface $client;
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private ResponseInterface $response;
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private array $info = ['canceled' => false];
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private $passthru;
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private $stream;
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private $yieldedState;
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/**
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* @param ?callable(ChunkInterface, AsyncContext): ?\Iterator $passthru
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*/
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public function __construct(HttpClientInterface $client, string $method, string $url, array $options, callable $passthru = null)
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{
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$this->client = $client;
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$this->shouldBuffer = $options['buffer'] ?? true;
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if (null !== $onProgress = $options['on_progress'] ?? null) {
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$thisInfo = &$this->info;
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$options['on_progress'] = static function (int $dlNow, int $dlSize, array $info) use (&$thisInfo, $onProgress) {
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$onProgress($dlNow, $dlSize, $thisInfo + $info);
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};
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}
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$this->response = $client->request($method, $url, ['buffer' => false] + $options);
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$this->passthru = $passthru;
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$this->initializer = static function (self $response, float $timeout = null) {
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if (null === $response->shouldBuffer) {
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return false;
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}
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while (true) {
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foreach (self::stream([$response], $timeout) as $chunk) {
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if ($chunk->isTimeout() && $response->passthru) {
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foreach (self::passthru($response->client, $response, new ErrorChunk($response->offset, new TransportException($chunk->getError()))) as $chunk) {
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if ($chunk->isFirst()) {
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return false;
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}
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}
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continue 2;
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}
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if ($chunk->isFirst()) {
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return false;
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}
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}
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return false;
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}
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};
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if (\array_key_exists('user_data', $options)) {
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$this->info['user_data'] = $options['user_data'];
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}
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if (\array_key_exists('max_duration', $options)) {
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$this->info['max_duration'] = $options['max_duration'];
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}
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}
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public function getStatusCode(): int
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{
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if ($this->initializer) {
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self::initialize($this);
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}
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return $this->response->getStatusCode();
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}
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public function getHeaders(bool $throw = true): array
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{
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if ($this->initializer) {
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self::initialize($this);
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}
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$headers = $this->response->getHeaders(false);
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if ($throw) {
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$this->checkStatusCode();
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}
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return $headers;
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}
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public function getInfo(string $type = null): mixed
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{
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if (null !== $type) {
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return $this->info[$type] ?? $this->response->getInfo($type);
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}
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return $this->info + $this->response->getInfo();
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}
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public function toStream(bool $throw = true)
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{
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if ($throw) {
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// Ensure headers arrived
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$this->getHeaders(true);
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}
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$handle = function () {
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$stream = $this->response instanceof StreamableInterface ? $this->response->toStream(false) : StreamWrapper::createResource($this->response);
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return stream_get_meta_data($stream)['wrapper_data']->stream_cast(\STREAM_CAST_FOR_SELECT);
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};
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$stream = StreamWrapper::createResource($this);
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stream_get_meta_data($stream)['wrapper_data']
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->bindHandles($handle, $this->content);
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return $stream;
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}
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public function cancel(): void
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{
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if ($this->info['canceled']) {
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return;
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}
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$this->info['canceled'] = true;
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$this->info['error'] = 'Response has been canceled.';
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$this->close();
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$client = $this->client;
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$this->client = null;
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if (!$this->passthru) {
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return;
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}
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try {
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foreach (self::passthru($client, $this, new LastChunk()) as $chunk) {
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// no-op
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}
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$this->passthru = null;
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} catch (ExceptionInterface) {
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// ignore any errors when canceling
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}
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}
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public function __destruct()
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{
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$httpException = null;
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if ($this->initializer && null === $this->getInfo('error')) {
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try {
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self::initialize($this, -0.0);
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$this->getHeaders(true);
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} catch (HttpExceptionInterface $httpException) {
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// no-op
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}
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}
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if ($this->passthru && null === $this->getInfo('error')) {
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$this->info['canceled'] = true;
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try {
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foreach (self::passthru($this->client, $this, new LastChunk()) as $chunk) {
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// no-op
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}
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} catch (ExceptionInterface) {
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// ignore any errors when destructing
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}
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}
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if (null !== $httpException) {
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throw $httpException;
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}
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}
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/**
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* @internal
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*/
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public static function stream(iterable $responses, float $timeout = null, string $class = null): \Generator
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{
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while ($responses) {
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$wrappedResponses = [];
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$asyncMap = new \SplObjectStorage();
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$client = null;
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foreach ($responses as $r) {
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if (!$r instanceof self) {
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throw new \TypeError(sprintf('"%s::stream()" expects parameter 1 to be an iterable of AsyncResponse objects, "%s" given.', $class ?? static::class, get_debug_type($r)));
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}
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if (null !== $e = $r->info['error'] ?? null) {
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yield $r => $chunk = new ErrorChunk($r->offset, new TransportException($e));
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$chunk->didThrow() ?: $chunk->getContent();
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continue;
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}
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if (null === $client) {
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$client = $r->client;
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} elseif ($r->client !== $client) {
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throw new TransportException('Cannot stream AsyncResponse objects with many clients.');
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}
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$asyncMap[$r->response] = $r;
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$wrappedResponses[] = $r->response;
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if ($r->stream) {
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yield from self::passthruStream($response = $r->response, $r, new FirstChunk(), $asyncMap);
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if (!isset($asyncMap[$response])) {
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array_pop($wrappedResponses);
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}
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if ($r->response !== $response && !isset($asyncMap[$r->response])) {
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$asyncMap[$r->response] = $r;
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$wrappedResponses[] = $r->response;
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}
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}
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}
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if (!$client || !$wrappedResponses) {
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return;
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}
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foreach ($client->stream($wrappedResponses, $timeout) as $response => $chunk) {
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$r = $asyncMap[$response];
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if (null === $chunk->getError()) {
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if ($chunk->isFirst()) {
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// Ensure no exception is thrown on destruct for the wrapped response
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$r->response->getStatusCode();
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} elseif (0 === $r->offset && null === $r->content && $chunk->isLast()) {
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$r->content = fopen('php://memory', 'w+');
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}
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}
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if (!$r->passthru) {
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if (null !== $chunk->getError() || $chunk->isLast()) {
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unset($asyncMap[$response]);
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} elseif (null !== $r->content && '' !== ($content = $chunk->getContent()) && \strlen($content) !== fwrite($r->content, $content)) {
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$chunk = new ErrorChunk($r->offset, new TransportException(sprintf('Failed writing %d bytes to the response buffer.', \strlen($content))));
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$r->info['error'] = $chunk->getError();
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$r->response->cancel();
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}
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yield $r => $chunk;
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continue;
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}
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if (null !== $chunk->getError()) {
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// no-op
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} elseif ($chunk->isFirst()) {
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$r->yieldedState = self::FIRST_CHUNK_YIELDED;
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} elseif (self::FIRST_CHUNK_YIELDED !== $r->yieldedState && null === $chunk->getInformationalStatus()) {
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throw new \LogicException(sprintf('Instance of "%s" is already consumed and cannot be managed by "%s". A decorated client should not call any of the response\'s methods in its "request()" method.', get_debug_type($response), $class ?? static::class));
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}
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foreach (self::passthru($r->client, $r, $chunk, $asyncMap) as $chunk) {
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yield $r => $chunk;
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}
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if ($r->response !== $response && isset($asyncMap[$response])) {
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break;
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}
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}
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if (null === $chunk->getError() && $chunk->isLast()) {
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$r->yieldedState = self::LAST_CHUNK_YIELDED;
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}
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if (null === $chunk->getError() && self::LAST_CHUNK_YIELDED !== $r->yieldedState && $r->response === $response && null !== $r->client) {
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throw new \LogicException('A chunk passthru must yield an "isLast()" chunk before ending a stream.');
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}
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$responses = [];
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foreach ($asyncMap as $response) {
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$r = $asyncMap[$response];
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if (null !== $r->client) {
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$responses[] = $asyncMap[$response];
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}
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}
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}
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}
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/**
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* @param \SplObjectStorage<ResponseInterface, AsyncResponse>|null $asyncMap
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*/
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private static function passthru(HttpClientInterface $client, self $r, ChunkInterface $chunk, \SplObjectStorage $asyncMap = null): \Generator
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{
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$r->stream = null;
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$response = $r->response;
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$context = new AsyncContext($r->passthru, $client, $r->response, $r->info, $r->content, $r->offset);
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if (null === $stream = ($r->passthru)($chunk, $context)) {
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if ($r->response === $response && (null !== $chunk->getError() || $chunk->isLast())) {
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throw new \LogicException('A chunk passthru cannot swallow the last chunk.');
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}
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return;
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}
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if (!$stream instanceof \Iterator) {
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throw new \LogicException(sprintf('A chunk passthru must return an "Iterator", "%s" returned.', get_debug_type($stream)));
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}
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$r->stream = $stream;
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yield from self::passthruStream($response, $r, null, $asyncMap);
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}
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/**
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* @param \SplObjectStorage<ResponseInterface, AsyncResponse>|null $asyncMap
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*/
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private static function passthruStream(ResponseInterface $response, self $r, ?ChunkInterface $chunk, ?\SplObjectStorage $asyncMap): \Generator
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{
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while (true) {
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try {
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if (null !== $chunk && $r->stream) {
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$r->stream->next();
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}
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if (!$r->stream || !$r->stream->valid() || !$r->stream) {
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$r->stream = null;
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break;
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}
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} catch (\Throwable $e) {
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unset($asyncMap[$response]);
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$r->stream = null;
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$r->info['error'] = $e->getMessage();
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$r->response->cancel();
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yield $r => $chunk = new ErrorChunk($r->offset, $e);
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$chunk->didThrow() ?: $chunk->getContent();
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break;
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}
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$chunk = $r->stream->current();
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if (!$chunk instanceof ChunkInterface) {
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throw new \LogicException(sprintf('A chunk passthru must yield instances of "%s", "%s" yielded.', ChunkInterface::class, get_debug_type($chunk)));
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}
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if (null !== $chunk->getError()) {
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// no-op
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} elseif ($chunk->isFirst()) {
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$e = $r->openBuffer();
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yield $r => $chunk;
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if ($r->initializer && null === $r->getInfo('error')) {
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// Ensure the HTTP status code is always checked
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$r->getHeaders(true);
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}
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if (null === $e) {
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continue;
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}
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$r->response->cancel();
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$chunk = new ErrorChunk($r->offset, $e);
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} elseif ('' !== $content = $chunk->getContent()) {
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if (null !== $r->shouldBuffer) {
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throw new \LogicException('A chunk passthru must yield an "isFirst()" chunk before any content chunk.');
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}
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if (null !== $r->content && \strlen($content) !== fwrite($r->content, $content)) {
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$chunk = new ErrorChunk($r->offset, new TransportException(sprintf('Failed writing %d bytes to the response buffer.', \strlen($content))));
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$r->info['error'] = $chunk->getError();
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$r->response->cancel();
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}
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}
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if (null !== $chunk->getError() || $chunk->isLast()) {
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$stream = $r->stream;
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$r->stream = null;
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unset($asyncMap[$response]);
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}
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if (null === $chunk->getError()) {
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$r->offset += \strlen($content);
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yield $r => $chunk;
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if (!$chunk->isLast()) {
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continue;
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}
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$stream->next();
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if ($stream->valid()) {
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throw new \LogicException('A chunk passthru cannot yield after an "isLast()" chunk.');
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}
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$r->passthru = null;
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} else {
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if ($chunk instanceof ErrorChunk) {
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$chunk->didThrow(false);
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} else {
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try {
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$chunk = new ErrorChunk($chunk->getOffset(), !$chunk->isTimeout() ?: $chunk->getError());
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} catch (TransportExceptionInterface $e) {
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$chunk = new ErrorChunk($chunk->getOffset(), $e);
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}
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}
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yield $r => $chunk;
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$chunk->didThrow() ?: $chunk->getContent();
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}
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break;
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}
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}
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private function openBuffer(): ?\Throwable
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{
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if (null === $shouldBuffer = $this->shouldBuffer) {
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throw new \LogicException('A chunk passthru cannot yield more than one "isFirst()" chunk.');
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}
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$e = $this->shouldBuffer = null;
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if ($shouldBuffer instanceof \Closure) {
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try {
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$shouldBuffer = $shouldBuffer($this->getHeaders(false));
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if (null !== $e = $this->response->getInfo('error')) {
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throw new TransportException($e);
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}
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} catch (\Throwable $e) {
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$this->info['error'] = $e->getMessage();
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$this->response->cancel();
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}
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}
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if (true === $shouldBuffer) {
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$this->content = fopen('php://temp', 'w+');
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} elseif (\is_resource($shouldBuffer)) {
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$this->content = $shouldBuffer;
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}
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return $e;
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}
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private function close(): void
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{
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$this->response->cancel();
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}
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}
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