legacy-libs/grpc/deps/grpc/src/core/ext/filters/client_channel/client_channel.h

   1 /*
   2  *
   3  * Copyright 2015 gRPC authors.
   4  *
   5  * Licensed under the Apache License, Version 2.0 (the "License");
   6  * you may not use this file except in compliance with the License.
   7  * You may obtain a copy of the License at
   8  *
   9  *     http://www.apache.org/licenses/LICENSE-2.0
  10  *
  11  * Unless required by applicable law or agreed to in writing, software
  12  * distributed under the License is distributed on an "AS IS" BASIS,
  13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14  * See the License for the specific language governing permissions and
  15  * limitations under the License.
  16  *
  17  */
  18
  19 #ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H
  20 #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H
  21
  22 #include <grpc/support/port_platform.h>
  23
  24 #include "src/core/ext/filters/client_channel/client_channel_channelz.h"
  25 #include "src/core/ext/filters/client_channel/client_channel_factory.h"
  26 #include "src/core/ext/filters/client_channel/resolver.h"
  27 #include "src/core/lib/channel/channel_stack.h"
  28
  29 extern grpc_core::TraceFlag grpc_client_channel_trace;
  30
  31 // Channel arg key for server URI string.
  32 #define GRPC_ARG_SERVER_URI "grpc.server_uri"
  33
  34 /* A client channel is a channel that begins disconnected, and can connect
  35    to some endpoint on demand. If that endpoint disconnects, it will be
  36    connected to again later.
  37
  38    Calls on a disconnected client channel are queued until a connection is
  39    established. */
  40
  41 extern const grpc_channel_filter grpc_client_channel_filter;
  42
  43 grpc_connectivity_state grpc_client_channel_check_connectivity_state(
  44     grpc_channel_element* elem, int try_to_connect);
  45
  46 int grpc_client_channel_num_external_connectivity_watchers(
  47     grpc_channel_element* elem);
  48
  49 void grpc_client_channel_watch_connectivity_state(
  50     grpc_channel_element* elem, grpc_polling_entity pollent,
  51     grpc_connectivity_state* state, grpc_closure* on_complete,
  52     grpc_closure* watcher_timer_init);
  53
  54 /* Debug helper: pull the subchannel call from a call stack element */
  55 grpc_core::RefCountedPtr<grpc_core::SubchannelCall>
  56 grpc_client_channel_get_subchannel_call(grpc_call_element* elem);
  57
  58 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H */