/* * * Copyright 2015 gRPC authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ #ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_CLIENT_CHTTP2_CONNECTOR_H #define GRPC_CORE_EXT_TRANSPORT_CHTTP2_CLIENT_CHTTP2_CONNECTOR_H #include #include "src/core/ext/filters/client_channel/connector.h" #include "src/core/lib/channel/handshaker.h" #include "src/core/lib/channel/handshaker_registry.h" namespace grpc_core { class Chttp2Connector : public SubchannelConnector { public: Chttp2Connector(); ~Chttp2Connector() override; void Connect(const Args& args, Result* result, grpc_closure* notify) override; void Shutdown(grpc_error_handle error) override; private: static void Connected(void* arg, grpc_error_handle error); void StartHandshakeLocked(); static void OnHandshakeDone(void* arg, grpc_error_handle error); static void OnReceiveSettings(void* arg, grpc_error_handle error); static void OnTimeout(void* arg, grpc_error_handle error); // We cannot invoke notify_ until both OnTimeout() and OnReceiveSettings() // have been called since that is an indicator to the upper layer that we are // done with the connection attempt. So, the notification process is broken // into two steps. 1) Either OnTimeout() or OnReceiveSettings() gets invoked // first. Whichever gets invoked, calls MaybeNotify() to set the result and // triggers the other callback to be invoked. 2) When the other callback is // invoked, we call MaybeNotify() again to actually invoke the notify_ // callback. Note that this only happens if the handshake is done and the // connector is waiting on the SETTINGS frame. void MaybeNotify(grpc_error_handle error); Mutex mu_; Args args_; Result* result_ = nullptr; grpc_closure* notify_ = nullptr; bool shutdown_ = false; bool connecting_ = false; // Holds the endpoint when first created before being handed off to // the handshake manager, and then again after handshake is done. grpc_endpoint* endpoint_ = nullptr; grpc_closure connected_; grpc_closure on_receive_settings_; grpc_timer timer_; grpc_closure on_timeout_; absl::optional notify_error_; RefCountedPtr handshake_mgr_; }; } // namespace grpc_core #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_CLIENT_CHTTP2_CONNECTOR_H */