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/*
*
* 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_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/client_channel_channelz.h"
#include "src/core/ext/filters/client_channel/client_channel_factory.h"
#include "src/core/ext/filters/client_channel/resolver.h"
#include "src/core/lib/channel/channel_stack.h"
extern grpc_core::TraceFlag grpc_client_channel_trace;
// Channel arg key for server URI string.
#define GRPC_ARG_SERVER_URI "grpc.server_uri"
/* A client channel is a channel that begins disconnected, and can connect
to some endpoint on demand. If that endpoint disconnects, it will be
connected to again later.
Calls on a disconnected client channel are queued until a connection is
established. */
extern const grpc_channel_filter grpc_client_channel_filter;
grpc_connectivity_state grpc_client_channel_check_connectivity_state(
grpc_channel_element* elem, int try_to_connect);
int grpc_client_channel_num_external_connectivity_watchers(
grpc_channel_element* elem);
// Starts a one-time connectivity state watch. When the channel's state
// becomes different from *state, sets *state to the new state and
// schedules on_complete. The watcher_timer_init callback is invoked as
// soon as the watch is actually started (i.e., after hopping into the
// client channel combiner). I/O will be serviced via pollent.
//
// This is intended to be used when starting a watch from outside of C-core
// via grpc_channel_watch_connectivity_state(). It should not be used
// by other callers.
void grpc_client_channel_watch_connectivity_state(
grpc_channel_element* elem, grpc_polling_entity pollent,
grpc_connectivity_state* state, grpc_closure* on_complete,
grpc_closure* watcher_timer_init);
// Starts and stops a connectivity watch. The watcher will be initially
// notified as soon as the state changes from initial_state and then on
// every subsequent state change until either the watch is stopped or
// it is notified that the state has changed to SHUTDOWN.
//
// This is intended to be used when starting watches from code inside of
// C-core (e.g., for a nested control plane channel for things like xds).
void grpc_client_channel_start_connectivity_watch(
grpc_channel_element* elem, grpc_connectivity_state initial_state,
grpc_core::OrphanablePtr<grpc_core::AsyncConnectivityStateWatcherInterface>
watcher);
void grpc_client_channel_stop_connectivity_watch(
grpc_channel_element* elem,
grpc_core::AsyncConnectivityStateWatcherInterface* watcher);
#endif // GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_CLIENT_CHANNEL_H
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