<?php
namespace Guzzle\Http\Curl;
use Guzzle\Common\AbstractHasDispatcher;
use Guzzle\Common\Event;
use Guzzle\Http\Exception\MultiTransferException;
use Guzzle\Http\Exception\CurlException;
use Guzzle\Http\Message\RequestInterface;
use Guzzle\Http\Message\EntityEnclosingRequestInterface;
use Guzzle\Http\Exception\RequestException;
/**
* Send {@see RequestInterface} objects in parallel using curl_multi
*/
class CurlMulti extends AbstractHasDispatcher implements CurlMultiInterface
{
/** @var resource cURL multi handle. */
protected $multiHandle;
/** @var array Attached {@see RequestInterface} objects. */
protected $requests;
/** @var \SplObjectStorage RequestInterface to CurlHandle hash */
protected $handles;
/** @var array Hash mapping curl handle resource IDs to request objects */
protected $resourceHash;
/** @var array Queued exceptions */
protected $exceptions = array();
/** @var array Requests that succeeded */
protected $successful = array();
/** @var array cURL multi error values and codes */
protected $multiErrors = array(
CURLM_BAD_HANDLE => array('CURLM_BAD_HANDLE', 'The passed-in handle is not a valid CURLM handle.'),
CURLM_BAD_EASY_HANDLE => array('CURLM_BAD_EASY_HANDLE', "An easy handle was not good/valid. It could mean that it isn't an easy handle at all, or possibly that the handle already is in used by this or another multi handle."),
CURLM_OUT_OF_MEMORY => array('CURLM_OUT_OF_MEMORY', 'You are doomed.'),
CURLM_INTERNAL_ERROR => array('CURLM_INTERNAL_ERROR', 'This can only be returned if libcurl bugs. Please report it to us!')
);
/** @var float */
protected $selectTimeout;
public function __construct($selectTimeout = 1.0)
{
$this->selectTimeout = $selectTimeout;
$this->multiHandle = curl_multi_init();
// @codeCoverageIgnoreStart
if ($this->multiHandle === false) {
throw new CurlException('Unable to create multi handle');
}
// @codeCoverageIgnoreEnd
$this->reset();
}
public function __destruct()
{
if (is_resource($this->multiHandle)) {
curl_multi_close($this->multiHandle);
}
}
public function add(RequestInterface $request)
{
$this->requests[] = $request;
// If requests are currently transferring and this is async, then the
// request must be prepared now as the send() method is not called.
$this->beforeSend($request);
$this->dispatch(self::ADD_REQUEST, array('request' => $request));
return $this;
}
public function all()
{
return $this->requests;
}
public function remove(RequestInterface $request)
{
$this->removeHandle($request);
if (($index = array_search($request, $this->requests, true)) !== false) {
$request = $this->requests[$index];
unset($this->requests[$index]);
$this->requests = array_values($this->requests);
$this->dispatch(self::REMOVE_REQUEST, array('request' => $request));
return true;
}
return false;
}
public function reset($hard = false)
{
// Remove each request
if ($this->requests) {
foreach ($this->requests as $request) {
$this->remove($request);
}
}
$this->handles = new \SplObjectStorage();
$this->requests = $this->resourceHash = $this->exceptions = $this->successful = array();
}
public function send()
{
$this->perform();
$exceptions = $this->exceptions;
$successful = $this->successful;
$this->reset();
if ($exceptions) {
$this->throwMultiException($exceptions, $successful);
}
}
public function count()
{
return count($this->requests);
}
/**
* Build and throw a MultiTransferException
*
* @param array $exceptions Exceptions encountered
* @param array $successful Successful requests
* @throws MultiTransferException
*/
protected function throwMultiException(array $exceptions, array $successful)
{
$multiException = new MultiTransferException('Errors during multi transfer');
while ($e = array_shift($exceptions)) {
$multiException->addFailedRequestWithException($e['request'], $e['exception']);
}
// Add successful requests
foreach ($successful as $request) {
if (!$multiException->containsRequest($request)) {
$multiException->addSuccessfulRequest($request);
}
}
throw $multiException;
}
/**
* Prepare for sending
*
* @param RequestInterface $request Request to prepare
* @throws \Exception on error preparing the request
*/
protected function beforeSend(RequestInterface $request)
{
try {
$state = $request->setState(RequestInterface::STATE_TRANSFER);
if ($state == RequestInterface::STATE_TRANSFER) {
$this->addHandle($request);
} else {
// Requests might decide they don't need to be sent just before
// transfer (e.g. CachePlugin)
$this->remove($request);
if ($state == RequestInterface::STATE_COMPLETE) {
$this->successful[] = $request;
}
}
} catch (\Exception $e) {
// Queue the exception to be thrown when sent
$this->removeErroredRequest($request, $e);
}
}
private function addHandle(RequestInterface $request)
{
$handle = $this->createCurlHandle($request)->getHandle();
$this->checkCurlResult(
curl_multi_add_handle($this->multiHandle, $handle)
);
}
/**
* Create a curl handle for a request
*
* @param RequestInterface $request Request
*
* @return CurlHandle
*/
protected function createCurlHandle(RequestInterface $request)
{
$wrapper = CurlHandle::factory($request);
$this->handles[$request] = $wrapper;
$this->resourceHash[(int) $wrapper->getHandle()] = $request;
return $wrapper;
}
/**
* Get the data from the multi handle
*/
protected function perform()
{
$event = new Event(array('curl_multi' => $this));
while ($this->requests) {
// Notify each request as polling
$blocking = $total = 0;
foreach ($this->requests as $request) {
++$total;
$event['request'] = $request;
$request->getEventDispatcher()->dispatch(self::POLLING_REQUEST, $event);
// The blocking variable just has to be non-falsey to block the loop
if ($request->getParams()->hasKey(self::BLOCKING)) {
++$blocking;
}
}
if ($blocking == $total) {
// Sleep to prevent eating CPU because no requests are actually pending a select call
usleep(500);
} else {
$this->executeHandles();
}
}
}
/**
* Execute and select curl handles
*/
private function executeHandles()
{
// The first curl_multi_select often times out no matter what, but is usually required for fast transfers
$selectTimeout = 0.001;
$active = false;
do {
while (($mrc = curl_multi_exec($this->multiHandle, $active)) == CURLM_CALL_MULTI_PERFORM);
$this->checkCurlResult($mrc);
$this->processMessages();
if ($active && curl_multi_select($this->multiHandle, $selectTimeout) === -1) {
// Perform a usleep if a select returns -1: https://bugs.php.net/bug.php?id=61141
usleep(150);
}
$selectTimeout = $this->selectTimeout;
} while ($active);
}
/**
* Process any received curl multi messages
*/
private function processMessages()
{
while ($done = curl_multi_info_read($this->multiHandle)) {
$request = $this->resourceHash[(int) $done['handle']];
try {
$this->processResponse($request, $this->handles[$request], $done);
$this->successful[] = $request;
} catch (\Exception $e) {
$this->removeErroredRequest($request, $e);
}
}
}
/**
* Remove a request that encountered an exception
*
* @param RequestInterface $request Request to remove
* @param \Exception $e Exception encountered
*/
protected function removeErroredRequest(RequestInterface $request, \Exception $e = null)
{
$this->exceptions[] = array('request' => $request, 'exception' => $e);
$this->remove($request);
$this->dispatch(self::MULTI_EXCEPTION, array('exception' => $e, 'all_exceptions' => $this->exceptions));
}
/**
* Check for errors and fix headers of a request based on a curl response
*
* @param RequestInterface $request Request to process
* @param CurlHandle $handle Curl handle object
* @param array $curl Array returned from curl_multi_info_read
*
* @throws CurlException on Curl error
*/
protected function processResponse(RequestInterface $request, CurlHandle $handle, array $curl)
{
// Set the transfer stats on the response
$handle->updateRequestFromTransfer($request);
// Check if a cURL exception occurred, and if so, notify things
$curlException = $this->isCurlException($request, $handle, $curl);
// Always remove completed curl handles. They can be added back again
// via events if needed (e.g. ExponentialBackoffPlugin)
$this->removeHandle($request);
if (!$curlException) {
if ($this->validateResponseWasSet($request)) {
$state = $request->setState(
RequestInterface::STATE_COMPLETE,
array('handle' => $handle)
);
// Only remove the request if it wasn't resent as a result of
// the state change
if ($state != RequestInterface::STATE_TRANSFER) {
$this->remove($request);
}
}
return;
}
// Set the state of the request to an error
$state = $request->setState(RequestInterface::STATE_ERROR, array('exception' => $curlException));
// Allow things to ignore the error if possible
if ($state != RequestInterface::STATE_TRANSFER) {
$this->remove($request);
}
// The error was not handled, so fail
if ($state == RequestInterface::STATE_ERROR) {
/** @var CurlException $curlException */
throw $curlException;
}
}
/**
* Remove a curl handle from the curl multi object
*
* @param RequestInterface $request Request that owns the handle
*/
protected function removeHandle(RequestInterface $request)
{
if (isset($this->handles[$request])) {
$handle = $this->handles[$request];
curl_multi_remove_handle($this->multiHandle, $handle->getHandle());
unset($this->handles[$request]);
unset($this->resourceHash[(int) $handle->getHandle()]);
$handle->close();
}
}
/**
* Check if a cURL transfer resulted in what should be an exception
*
* @param RequestInterface $request Request to check
* @param CurlHandle $handle Curl handle object
* @param array $curl Array returned from curl_multi_info_read
*
* @return CurlException|bool
*/
private function isCurlException(RequestInterface $request, CurlHandle $handle, array $curl)
{
if (CURLM_OK == $curl['result'] || CURLM_CALL_MULTI_PERFORM == $curl['result']) {
return false;
}
$handle->setErrorNo($curl['result']);
$e = new CurlException(sprintf('[curl] %s: %s [url] %s',
$handle->getErrorNo(), $handle->getError(), $handle->getUrl()));
$e->setCurlHandle($handle)
->setRequest($request)
->setCurlInfo($handle->getInfo())
->setError($handle->getError(), $handle->getErrorNo());
return $e;
}
/**
* Throw an exception for a cURL multi response if needed
*
* @param int $code Curl response code
* @throws CurlException
*/
private function checkCurlResult($code)
{
if ($code != CURLM_OK && $code != CURLM_CALL_MULTI_PERFORM) {
throw new CurlException(isset($this->multiErrors[$code])
? "cURL error: {$code} ({$this->multiErrors[$code][0]}): cURL message: {$this->multiErrors[$code][1]}"
: 'Unexpected cURL error: ' . $code
);
}
}
/**
* @link https://github.com/guzzle/guzzle/issues/710
*/
private function validateResponseWasSet(RequestInterface $request)
{
if ($request->getResponse()) {
return true;
}
$body = $request instanceof EntityEnclosingRequestInterface
? $request->getBody()
: null;
if (!$body) {
$rex = new RequestException(
'No response was received for a request with no body. This'
. ' could mean that you are saturating your network.'
);
$rex->setRequest($request);
$this->removeErroredRequest($request, $rex);
} elseif (!$body->isSeekable() || !$body->seek(0)) {
// Nothing we can do with this. Sorry!
$rex = new RequestException(
'The connection was unexpectedly closed. The request would'
. ' have been retried, but attempting to rewind the'
. ' request body failed.'
);
$rex->setRequest($request);
$this->removeErroredRequest($request, $rex);
} else {
$this->remove($request);
// Add the request back to the batch to retry automatically.
$this->requests[] = $request;
$this->addHandle($request);
}
return false;
}
}