<?php
namespace GuzzleHttp\Handler;
use Closure;
use GuzzleHttp\Promise as P;
use GuzzleHttp\Promise\Promise;
use GuzzleHttp\Promise\PromiseInterface;
use GuzzleHttp\Utils;
use Psr\Http\Message\RequestInterface;
/**
* Returns an asynchronous response using curl_multi_* functions.
*
* When using the CurlMultiHandler, custom curl options can be specified as an
* associative array of curl option constants mapping to values in the
* **curl** key of the provided request options.
*
* @final
*/
class CurlMultiHandler
{
/**
* @var CurlFactoryInterface
*/
private $factory;
/**
* @var int
*/
private $selectTimeout;
/**
* @var int Will be higher than 0 when `curl_multi_exec` is still running.
*/
private $active = 0;
/**
* @var array Request entry handles, indexed by handle id in `addRequest`.
*
* @see CurlMultiHandler::addRequest
*/
private $handles = [];
/**
* @var array<int, float> An array of delay times, indexed by handle id in `addRequest`.
*
* @see CurlMultiHandler::addRequest
*/
private $delays = [];
/**
* @var array<mixed> An associative array of CURLMOPT_* options and corresponding values for curl_multi_setopt()
*/
private $options = [];
/** @var resource|\CurlMultiHandle */
private $_mh;
/**
* This handler accepts the following options:
*
* - handle_factory: An optional factory used to create curl handles
* - select_timeout: Optional timeout (in seconds) to block before timing
* out while selecting curl handles. Defaults to 1 second.
* - options: An associative array of CURLMOPT_* options and
* corresponding values for curl_multi_setopt()
*/
public function __construct(array $options = [])
{
$this->factory = $options['handle_factory'] ?? new CurlFactory(50);
if (isset($options['select_timeout'])) {
$this->selectTimeout = $options['select_timeout'];
} elseif ($selectTimeout = Utils::getenv('GUZZLE_CURL_SELECT_TIMEOUT')) {
@trigger_error('Since guzzlehttp/guzzle 7.2.0: Using environment variable GUZZLE_CURL_SELECT_TIMEOUT is deprecated. Use option "select_timeout" instead.', \E_USER_DEPRECATED);
$this->selectTimeout = (int) $selectTimeout;
} else {
$this->selectTimeout = 1;
}
$this->options = $options['options'] ?? [];
// unsetting the property forces the first access to go through
// __get().
unset($this->_mh);
}
/**
* @param string $name
*
* @return resource|\CurlMultiHandle
*
* @throws \BadMethodCallException when another field as `_mh` will be gotten
* @throws \RuntimeException when curl can not initialize a multi handle
*/
public function __get($name)
{
if ($name !== '_mh') {
throw new \BadMethodCallException("Can not get other property as '_mh'.");
}
$multiHandle = \curl_multi_init();
if (false === $multiHandle) {
throw new \RuntimeException('Can not initialize curl multi handle.');
}
$this->_mh = $multiHandle;
foreach ($this->options as $option => $value) {
// A warning is raised in case of a wrong option.
curl_multi_setopt($this->_mh, $option, $value);
}
return $this->_mh;
}
public function __destruct()
{
if (isset($this->_mh)) {
\curl_multi_close($this->_mh);
unset($this->_mh);
}
}
public function __invoke(RequestInterface $request, array $options): PromiseInterface
{
$easy = $this->factory->create($request, $options);
$id = (int) $easy->handle;
$promise = new Promise(
[$this, 'execute'],
function () use ($id) {
return $this->cancel($id);
}
);
$this->addRequest(['easy' => $easy, 'deferred' => $promise]);
return $promise;
}
/**
* Ticks the curl event loop.
*/
public function tick(): void
{
// Add any delayed handles if needed.
if ($this->delays) {
$currentTime = Utils::currentTime();
foreach ($this->delays as $id => $delay) {
if ($currentTime >= $delay) {
unset($this->delays[$id]);
\curl_multi_add_handle(
$this->_mh,
$this->handles[$id]['easy']->handle
);
}
}
}
// Run curl_multi_exec in the queue to enable other async tasks to run
P\Utils::queue()->add(Closure::fromCallable([$this, 'tickInQueue']));
// Step through the task queue which may add additional requests.
P\Utils::queue()->run();
if ($this->active && \curl_multi_select($this->_mh, $this->selectTimeout) === -1) {
// Perform a usleep if a select returns -1.
// See: https://bugs.php.net/bug.php?id=61141
\usleep(250);
}
while (\curl_multi_exec($this->_mh, $this->active) === \CURLM_CALL_MULTI_PERFORM) {
// Prevent busy looping for slow HTTP requests.
\curl_multi_select($this->_mh, $this->selectTimeout);
}
$this->processMessages();
}
/**
* Runs \curl_multi_exec() inside the event loop, to prevent busy looping
*/
private function tickInQueue(): void
{
if (\curl_multi_exec($this->_mh, $this->active) === \CURLM_CALL_MULTI_PERFORM) {
\curl_multi_select($this->_mh, 0);
P\Utils::queue()->add(Closure::fromCallable([$this, 'tickInQueue']));
}
}
/**
* Runs until all outstanding connections have completed.
*/
public function execute(): void
{
$queue = P\Utils::queue();
while ($this->handles || !$queue->isEmpty()) {
// If there are no transfers, then sleep for the next delay
if (!$this->active && $this->delays) {
\usleep($this->timeToNext());
}
$this->tick();
}
}
private function addRequest(array $entry): void
{
$easy = $entry['easy'];
$id = (int) $easy->handle;
$this->handles[$id] = $entry;
if (empty($easy->options['delay'])) {
\curl_multi_add_handle($this->_mh, $easy->handle);
} else {
$this->delays[$id] = Utils::currentTime() + ($easy->options['delay'] / 1000);
}
}
/**
* Cancels a handle from sending and removes references to it.
*
* @param int $id Handle ID to cancel and remove.
*
* @return bool True on success, false on failure.
*/
private function cancel($id): bool
{
if (!is_int($id)) {
trigger_deprecation('guzzlehttp/guzzle', '7.4', 'Not passing an integer to %s::%s() is deprecated and will cause an error in 8.0.', __CLASS__, __FUNCTION__);
}
// Cannot cancel if it has been processed.
if (!isset($this->handles[$id])) {
return false;
}
$handle = $this->handles[$id]['easy']->handle;
unset($this->delays[$id], $this->handles[$id]);
\curl_multi_remove_handle($this->_mh, $handle);
if (PHP_VERSION_ID < 80000) {
\curl_close($handle);
}
return true;
}
private function processMessages(): void
{
while ($done = \curl_multi_info_read($this->_mh)) {
if ($done['msg'] !== \CURLMSG_DONE) {
// if it's not done, then it would be premature to remove the handle. ref https://github.com/guzzle/guzzle/pull/2892#issuecomment-945150216
continue;
}
$id = (int) $done['handle'];
\curl_multi_remove_handle($this->_mh, $done['handle']);
if (!isset($this->handles[$id])) {
// Probably was cancelled.
continue;
}
$entry = $this->handles[$id];
unset($this->handles[$id], $this->delays[$id]);
$entry['easy']->errno = $done['result'];
$entry['deferred']->resolve(
CurlFactory::finish($this, $entry['easy'], $this->factory)
);
}
}
private function timeToNext(): int
{
$currentTime = Utils::currentTime();
$nextTime = \PHP_INT_MAX;
foreach ($this->delays as $time) {
if ($time < $nextTime) {
$nextTime = $time;
}
}
return ((int) \max(0, $nextTime - $currentTime)) * 1000000;
}
}
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