/** * Server socket had something happen. We accept all waiting client * connections on fd and assign TConnection objects to handle those requests. */ void TNonblockingServer::handleEvent(THRIFT_SOCKET fd, short which) { (void)which; // Make sure that libevent didn't mess up the socket handles assert(fd == serverSocket_); // Going to accept a new client socket stdcxx::shared_ptr<TSocket> clientSocket; clientSocket = serverTransport_->accept(); if (clientSocket) { // If we're overloaded, take action here if (overloadAction_ != T_OVERLOAD_NO_ACTION && serverOverloaded()) { Guard g(connMutex_); nConnectionsDropped_++; nTotalConnectionsDropped_++; if (overloadAction_ == T_OVERLOAD_CLOSE_ON_ACCEPT) { clientSocket->close(); return; } else if (overloadAction_ == T_OVERLOAD_DRAIN_TASK_QUEUE) { if (!drainPendingTask()) { // Nothing left to discard, so we drop connection instead. clientSocket->close(); return; } } } // Create a new TConnection for this client socket. TConnection* clientConnection = createConnection(clientSocket); // Fail fast if we could not create a TConnection object if (clientConnection == NULL) { GlobalOutput.printf("thriftServerEventHandler: failed TConnection factory"); clientSocket->close(); return; } /* * Either notify the ioThread that is assigned this connection to * start processing, or if it is us, we'll just ask this * connection to do its initial state change here. * * (We need to avoid writing to our own notification pipe, to * avoid possible deadlocks if the pipe is full.) * * The IO thread #0 is the only one that handles these listen * events, so unless the connection has been assigned to thread #0 * we know it's not on our thread. */ if (clientConnection->getIOThreadNumber() == 0) { clientConnection->transition(); } else { if (!clientConnection->notifyIOThread()) { GlobalOutput.perror("[ERROR] notifyIOThread failed on fresh connection, closing", errno); clientConnection->close(); } } } }