private function retrieveResponse($connectionData)
{
$curlHandle = $this->curl->init();
if ($curlHandle === false) {
$this->log->error("curl_init() did not return a handle for ID {$id}. " . 'Setting an empty response...');
return FF::getInstance('Core\\Server\\NullResponse');
}
// We cannot use array_merge() here, because that does not preserve
// numeric keys. So we use array union instead. However, as opposed to
// array_merge(), the left-hand operator's keys will be preserved.
$curlOptions = $this->necessaryCurlOptions + $connectionData->getConnectionOptions() + $this->defaultCurlOptions;
$this->curl->setopt_array($curlHandle, $curlOptions);
$responseText = $this->curl->exec($curlHandle);
$httpCode = (int) $this->curl->getinfo($curlHandle, CURLINFO_HTTP_CODE);
$curlErrorNumber = $this->curl->errno($curlHandle);
$curlError = $this->curl->error($curlHandle);
$this->curl->close($curlHandle);
return FF::getInstance('Core\\Server\\Response', $responseText, $httpCode, $curlErrorNumber, $curlError);
}
private function retrieveResponses($connectionsToFetch)
{
$curl = $this->curl;
$multiHandle = $curl->multi_init();
if ($multiHandle === false) {
$this->log->error("curl_multi_init() did not return a multi handle. " . 'Setting a empty responses...');
foreach ($connectionsToFetch as $id => $data) {
$data['connection']->setResponse(FF::getInstance('Core\\Server\\NullResponse'), $data['url']);
}
}
// Use a reference so that we can add a 'handle' field in the loop.
foreach ($connectionsToFetch as $id => &$data) {
$data['handle'] = $curl->init();
if ($data['handle'] === false) {
$this->log->error("curl_init() did not return a handle for ID {$id}. " . 'Setting an empty response...');
$data['connection']->setResponse(FF::getInstance('Core\\Server\\NullResponse'), $data['url']);
}
// We cannot use array_merge() here, because that does not preserve
// numeric keys. So we use array union instead. However, as opposed
// to array_merge() the left-hand operator's keys will be preserved.
$curlOptions = $this->necessaryCurlOptions + $data['connection']->getConnectionOptions() + $this->defaultCurlOptions;
$curl->setopt_array($data['handle'], $curlOptions);
$curl->multi_add_handle($multiHandle, $data['handle']);
}
unset($data);
// Otherwise the reference remains and reusing the
// variable name $data further down this function will
// change the last element of the array.
do {
$status = $curl->multi_exec($multiHandle, $still_running);
} while ($status == CURLM_CALL_MULTI_PERFORM);
while ($still_running && $status == CURLM_OK) {
// curl_multi_select sometimes returns -1 indefinitely in which case
// the usual curl multi loop would run endlessly. This is due to the
// underlying cURL library in C, which returns -1 upon errors which
// cannot be checked from the outside. Simply waiting for 100 ms is
// the suggested workaround. For further information see:
// https://bugs.php.net/bug.php?id=61141
// https://bugs.php.net/bug.php?id=63411
// https://bugs.php.net/bug.php?id=63842
// http://curl.haxx.se/libcurl/c/curl_multi_fdset.html
if ($curl->multi_select($multiHandle) == -1) {
usleep(100);
}
do {
$status = $curl->multi_exec($multiHandle, $still_running);
} while ($status == CURLM_CALL_MULTI_PERFORM);
// TODO: Fetch responses within this loop as they are ready (while
// the others are still loading).
}
if ($status != CURLM_OK) {
$this->log->error('There was a cURL error: ' . $status);
}
while (($msg = $curl->multi_info_read($multiHandle)) !== false) {
// We do not check the value of $msg['msg'], because currently this
// will always be CURLMSG_DONE.
$curlErrorNumber = $msg['result'];
// Set $data to the data array corresponding to the current handle.
foreach ($connectionsToFetch as $data) {
if ($data['handle'] === $msg['handle']) {
break;
}
}
// We could skip multi_getcontent if $curlErrorNumber is different
// from CURLE_OK, as it will always return null.
$responseText = $curl->multi_getcontent($data['handle']);
$httpCode = (int) $curl->getinfo($data['handle'], CURLINFO_HTTP_CODE);
$curlError = $curl->error($data['handle']);
$curl->multi_remove_handle($multiHandle, $data['handle']);
$this->curl->close($data['handle']);
$response = FF::getInstance('Core\\Server\\Response', $responseText, $httpCode, $curlErrorNumber, $curlError);
$data['connection']->setResponse($response, $data['url']);
$this->logResult($response);
}
}