private function assertSameSubversionMessages($string, array $structs)
{
$proto = new DiffusionSubversionWireProtocol();
// Verify that the wire message parses into the structs.
$messages = $proto->writeData($string);
$messages = ipull($messages, 'structure');
$this->assertEqual($structs, $messages, 'parse<' . $string . '>');
// Verify that the structs serialize into the wire message.
$serial = array();
foreach ($structs as $struct) {
$serial[] = $proto->serializeStruct($struct);
}
$serial = implode('', $serial);
$this->assertEqual($string, $serial, 'serialize<' . $string . '>');
}
protected function identifyRepository()
{
// NOTE: In SVN, we need to read the first few protocol frames before we
// can determine which repository the user is trying to access. We're
// going to peek at the data on the wire to identify the repository.
$io_channel = $this->getIOChannel();
// Before the client will send us the first protocol frame, we need to send
// it a connection frame with server capabilities. To figure out the
// correct frame we're going to start `svnserve`, read the frame from it,
// send it to the client, then kill the subprocess.
// TODO: This is pretty inelegant and the protocol frame will change very
// rarely. We could cache it if we can find a reasonable way to dirty the
// cache.
$command = csprintf('svnserve -t');
$command = PhabricatorDaemon::sudoCommandAsDaemonUser($command);
$future = new ExecFuture('%C', $command);
$exec_channel = new PhutilExecChannel($future);
$exec_protocol = new DiffusionSubversionWireProtocol();
while (true) {
PhutilChannel::waitForAny(array($exec_channel));
$exec_channel->update();
$exec_message = $exec_channel->read();
if ($exec_message !== null) {
$messages = $exec_protocol->writeData($exec_message);
if ($messages) {
$message = head($messages);
$raw = $message['raw'];
// Write the greeting frame to the client.
$io_channel->write($raw);
// Kill the subprocess.
$future->resolveKill();
break;
}
}
if (!$exec_channel->isOpenForReading()) {
throw new Exception(pht('%s subprocess exited before emitting a protocol frame.', 'svnserve'));
}
}
$io_protocol = new DiffusionSubversionWireProtocol();
while (true) {
PhutilChannel::waitForAny(array($io_channel));
$io_channel->update();
$in_message = $io_channel->read();
if ($in_message !== null) {
$this->peekBuffer .= $in_message;
if (strlen($this->peekBuffer) > 1024 * 1024) {
throw new Exception(pht('Client transmitted more than 1MB of data without transmitting ' . 'a recognizable protocol frame.'));
}
$messages = $io_protocol->writeData($in_message);
if ($messages) {
$message = head($messages);
$struct = $message['structure'];
// This is the:
//
// ( version ( cap1 ... ) url ... )
//
// The `url` allows us to identify the repository.
$uri = $struct[2]['value'];
$path = $this->getPathFromSubversionURI($uri);
return $this->loadRepositoryWithPath($path, PhabricatorRepositoryType::REPOSITORY_TYPE_SVN);
}
}
if (!$io_channel->isOpenForReading()) {
throw new Exception(pht('Client closed connection before sending a complete protocol ' . 'frame.'));
}
// If the client has disconnected, kill the subprocess and bail.
if (!$io_channel->isOpenForWriting()) {
throw new Exception(pht('Client closed connection before receiving response.'));
}
}
}