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PhabricatorBotBaseStreamingProtocolAdapter.php
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Fri, Nov 29, 15:27

PhabricatorBotBaseStreamingProtocolAdapter.php
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<?php
abstract class PhabricatorBotBaseStreamingProtocolAdapter
extends PhabricatorBaseProtocolAdapter {
private $readBuffers;
private $authtoken;
private $server;
private $readHandles;
private $multiHandle;
private $active;
private $inRooms = array();
public function getServiceName() {
$uri = new PhutilURI($this->server);
return $uri->getDomain();
}
public function connect() {
$this->server = $this->getConfig('server');
$this->authtoken = $this->getConfig('authtoken');
$rooms = $this->getConfig('join');
// First, join the room
if (!$rooms) {
throw new Exception("Not configured to join any rooms!");
}
$this->readBuffers = array();
// Set up our long poll in a curl multi request so we can
// continue running while it executes in the background
$this->multiHandle = curl_multi_init();
$this->readHandles = array();
foreach ($rooms as $room_id) {
$this->joinRoom($room_id);
// Set up the curl stream for reading
$url = $this->buildStreamingUrl($room_id);
$this->readHandle[$url] = curl_init();
curl_setopt($this->readHandle[$url], CURLOPT_URL, $url);
curl_setopt($this->readHandle[$url], CURLOPT_RETURNTRANSFER, true);
curl_setopt($this->readHandle[$url], CURLOPT_FOLLOWLOCATION, 1);
curl_setopt(
$this->readHandle[$url],
CURLOPT_USERPWD,
$this->authtoken.':x');
curl_setopt(
$this->readHandle[$url],
CURLOPT_HTTPHEADER,
array("Content-type: application/json"));
curl_setopt(
$this->readHandle[$url],
CURLOPT_WRITEFUNCTION,
array($this, 'read'));
curl_setopt($this->readHandle[$url], CURLOPT_BUFFERSIZE, 128);
curl_setopt($this->readHandle[$url], CURLOPT_TIMEOUT, 0);
curl_multi_add_handle($this->multiHandle, $this->readHandle[$url]);
// Initialize read buffer
$this->readBuffers[$url] = '';
}
$this->active = null;
$this->blockingMultiExec();
}
protected function joinRoom($room_id) {
// Optional hook, by default, do nothing
}
// This is our callback for the background curl multi-request.
// Puts the data read in on the readBuffer for processing.
private function read($ch, $data) {
$info = curl_getinfo($ch);
$length = strlen($data);
$this->readBuffers[$info['url']] .= $data;
return $length;
}
private function blockingMultiExec() {
do {
$status = curl_multi_exec($this->multiHandle, $this->active);
} while ($status == CURLM_CALL_MULTI_PERFORM);
// Check for errors
if ($status != CURLM_OK) {
throw new Exception(
"Phabricator Bot had a problem reading from stream.");
}
}
public function getNextMessages($poll_frequency) {
$messages = array();
if (!$this->active) {
throw new Exception("Phabricator Bot stopped reading from stream.");
}
// Prod our http request
curl_multi_select($this->multiHandle, $poll_frequency);
$this->blockingMultiExec();
// Process anything waiting on the read buffer
while ($m = $this->processReadBuffer()) {
$messages[] = $m;
}
return $messages;
}
private function processReadBuffer() {
foreach ($this->readBuffers as $url => &$buffer) {
$until = strpos($buffer, "}\r");
if ($until == false) {
continue;
}
$message = substr($buffer, 0, $until + 1);
$buffer = substr($buffer, $until + 2);
$m_obj = json_decode($message, true);
if ($message = $this->processMessage($m_obj)) {
return $message;
}
}
// If we're here, there's nothing to process
return false;
}
protected function performPost($endpoint, $data = null) {
$uri = new PhutilURI($this->server);
$uri->setPath($endpoint);
$payload = json_encode($data);
list($output) = id(new HTTPSFuture($uri))
->setMethod('POST')
->addHeader('Content-Type', 'application/json')
->addHeader('Authorization', $this->getAuthorizationHeader())
->setData($payload)
->resolvex();
$output = trim($output);
if (strlen($output)) {
return json_decode($output, true);
}
return true;
}
protected function getAuthorizationHeader() {
return 'Basic '.base64_encode($this->authtoken.':x');
}
abstract protected function buildStreamingUrl($channel);
abstract protected function processMessage($raw_object);
}

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