/**
* Returns true if the underlying socket is open, false if it has been closed.
*
* @return bool
*/
public function isOpen() : bool
{
return $this->socket->isOpen();
}
/**
* Services requests for a connected client.
*
* Manages the server-side state for the remote client and interprets client commands.
*/
private function handleClient(Socket $socket) : Generator
{
yield from log()->log(Log::INFO, 'Accepted client from %s:%d on %s:%d', $socket->getRemoteAddress(), $socket->getRemotePort(), $socket->getLocalAddress(), $socket->getLocalPort());
// Create a new context object for this client.
$context = new ClientContext($socket, $this->encoder, $this->accessLayer);
try {
// Send a welcome message.
$welcome = new Response(200, 'Ready');
yield from $context->writeResponse($welcome);
// Command loop
while ($socket->isOpen()) {
// Parse incoming commands.
$command = (yield from $context->readCommand());
// Determine the command name and choose how to handle it.
$handler = null;
switch ($command->name()) {
// Mandatory commands
case 'CAPABILITIES':
$handler = $this->getHandler(handlers\CapabilitiesHandler::class);
break;
case 'HEAD':
$handler = $this->getHandler(handlers\HeadHandler::class);
break;
case 'HELP':
$handler = $this->getHandler(handlers\HelpHandler::class);
break;
// We don't advertise MODE support, but some readers need it
// We don't advertise MODE support, but some readers need it
case 'MODE':
$handler = $this->getHandler(handlers\ModeHandler::class);
break;
case 'STAT':
$handler = $this->getHandler(handlers\StatHandler::class);
break;
case 'QUIT':
yield from $context->writeResponse(new Response(205, 'Closing connection'));
break 2;
// stop command loop
// LIST commands
// stop command loop
// LIST commands
case 'LIST':
$handler = $this->getHandler(handlers\ListHandler::class);
break;
// NEWNEWS commands
// NEWNEWS commands
case 'NEWNEWS':
$handler = $this->getHandler(handlers\NewNewsHandler::class);
break;
// POST commands
// POST commands
case 'POST':
$handler = $this->getHandler(handlers\PostHandler::class);
break;
// READER commands
// READER commands
case 'ARTICLE':
$handler = $this->getHandler(handlers\ArticleHandler::class);
break;
case 'BODY':
$handler = $this->getHandler(handlers\BodyHandler::class);
break;
case 'DATE':
$handler = $this->getHandler(handlers\DateHandler::class);
break;
case 'GROUP':
$handler = $this->getHandler(handlers\GroupHandler::class);
break;
case 'LAST':
$handler = $this->getHandler(handlers\LastHandler::class);
break;
case 'LISTGROUP':
$handler = $this->getHandler(handlers\ListGroupHandler::class);
break;
case 'NEWGROUPS':
$handler = $this->getHandler(handlers\NewGroupsHandler::class);
break;
case 'NEXT':
$handler = $this->getHandler(handlers\NextHandler::class);
break;
}
// Unknown command
if (!$handler) {
yield from $context->writeResponse(new Response(500, 'Unknown command'));
} else {
// Execute the selected command handler.
try {
yield from $handler->handle($command, $context);
} catch (\Throwable $e) {
yield from log()->log(Log::ERROR, 'Error handling command: ' . $e);
yield from $context->writeResponse(new Response(502, 'Server error'));
}
}
}
} catch (UnreadableException $e) {
// Client disconnected.
} catch (UnwritableException $e) {
// Client disconnected.
} catch (ClosedException $e) {
// Client disconnected.
}
yield from log()->log(Log::INFO, 'Disconnected client from %s:%d on %s:%d', $socket->getRemoteAddress(), $socket->getRemotePort(), $socket->getLocalAddress(), $socket->getLocalPort());
// Close the connection to the client.
if ($socket->isOpen()) {
$socket->close();
}
}
