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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H
#define GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H
#include "src/core/ext/client_channel/connector.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/iomgr/polling_entity.h"
#include "src/core/lib/transport/connectivity_state.h"
#include "src/core/lib/transport/metadata.h"
/** A (sub-)channel that knows how to connect to exactly one target
address. Provides a target for load balancing. */
typedef struct grpc_subchannel grpc_subchannel;
typedef struct grpc_connected_subchannel grpc_connected_subchannel;
typedef struct grpc_subchannel_call grpc_subchannel_call;
typedef struct grpc_subchannel_args grpc_subchannel_args;
#ifdef GRPC_STREAM_REFCOUNT_DEBUG
#define GRPC_SUBCHANNEL_REF(p, r) \
grpc_subchannel_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
grpc_subchannel_ref_from_weak_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) \
grpc_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_WEAK_REF(p, r) \
grpc_subchannel_weak_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \
grpc_subchannel_weak_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) \
grpc_connected_subchannel_ref((p), __FILE__, __LINE__, (r))
#define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \
grpc_connected_subchannel_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_CALL_REF(p, r) \
grpc_subchannel_call_ref((p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
grpc_subchannel_call_unref((cl), (p), __FILE__, __LINE__, (r))
#define GRPC_SUBCHANNEL_REF_EXTRA_ARGS \
, const char *file, int line, const char *reason
#else
#define GRPC_SUBCHANNEL_REF(p, r) grpc_subchannel_ref((p))
#define GRPC_SUBCHANNEL_REF_FROM_WEAK_REF(p, r) \
grpc_subchannel_ref_from_weak_ref((p))
#define GRPC_SUBCHANNEL_UNREF(cl, p, r) grpc_subchannel_unref((cl), (p))
#define GRPC_SUBCHANNEL_WEAK_REF(p, r) grpc_subchannel_weak_ref((p))
#define GRPC_SUBCHANNEL_WEAK_UNREF(cl, p, r) \
grpc_subchannel_weak_unref((cl), (p))
#define GRPC_CONNECTED_SUBCHANNEL_REF(p, r) grpc_connected_subchannel_ref((p))
#define GRPC_CONNECTED_SUBCHANNEL_UNREF(cl, p, r) \
grpc_connected_subchannel_unref((cl), (p))
#define GRPC_SUBCHANNEL_CALL_REF(p, r) grpc_subchannel_call_ref((p))
#define GRPC_SUBCHANNEL_CALL_UNREF(cl, p, r) \
grpc_subchannel_call_unref((cl), (p))
#define GRPC_SUBCHANNEL_REF_EXTRA_ARGS
#endif
grpc_subchannel *grpc_subchannel_ref(
grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
grpc_subchannel *grpc_subchannel_ref_from_weak_ref(
grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
grpc_subchannel *grpc_subchannel_weak_ref(
grpc_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_weak_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_connected_subchannel_ref(
grpc_connected_subchannel *channel GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_connected_subchannel_unref(grpc_exec_ctx *exec_ctx,
grpc_connected_subchannel *channel
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_call_ref(
grpc_subchannel_call *call GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
void grpc_subchannel_call_unref(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *call
GRPC_SUBCHANNEL_REF_EXTRA_ARGS);
/** construct a subchannel call */
grpc_error *grpc_connected_subchannel_create_call(
grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *connected_subchannel,
grpc_polling_entity *pollent, grpc_mdstr *path, gpr_timespec deadline,
grpc_subchannel_call **subchannel_call);
/** process a transport level op */
void grpc_connected_subchannel_process_transport_op(
grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *subchannel,
grpc_transport_op *op);
/** poll the current connectivity state of a channel */
grpc_connectivity_state grpc_subchannel_check_connectivity(
grpc_subchannel *channel, grpc_error **error);
/** call notify when the connectivity state of a channel changes from *state.
Updates *state with the new state of the channel */
void grpc_subchannel_notify_on_state_change(
grpc_exec_ctx *exec_ctx, grpc_subchannel *channel,
grpc_pollset_set *interested_parties, grpc_connectivity_state *state,
grpc_closure *notify);
void grpc_connected_subchannel_notify_on_state_change(
grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *channel,
grpc_pollset_set *interested_parties, grpc_connectivity_state *state,
grpc_closure *notify);
void grpc_connected_subchannel_ping(grpc_exec_ctx *exec_ctx,
grpc_connected_subchannel *channel,
grpc_closure *notify);
/** retrieve the grpc_connected_subchannel - or NULL if called before
the subchannel becomes connected */
grpc_connected_subchannel *grpc_subchannel_get_connected_subchannel(
grpc_subchannel *subchannel);
/** continue processing a transport op */
void grpc_subchannel_call_process_op(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *subchannel_call,
grpc_transport_stream_op *op);
/** continue querying for peer */
char *grpc_subchannel_call_get_peer(grpc_exec_ctx *exec_ctx,
grpc_subchannel_call *subchannel_call);
grpc_call_stack *grpc_subchannel_call_get_call_stack(
grpc_subchannel_call *subchannel_call);
struct grpc_subchannel_args {
/* When updating this struct, also update subchannel_index.c */
/** Channel filters for this channel - wrapped factories will likely
want to mutate this */
const grpc_channel_filter **filters;
/** The number of filters in the above array */
size_t filter_count;
/** Channel arguments to be supplied to the newly created channel */
const grpc_channel_args *args;
/** Server name */
const char *server_name;
/** Address to connect to */
struct sockaddr *addr;
size_t addr_len;
};
/** create a subchannel given a connector */
grpc_subchannel *grpc_subchannel_create(grpc_exec_ctx *exec_ctx,
grpc_connector *connector,
grpc_subchannel_args *args);
#endif /* GRPC_CORE_EXT_CLIENT_CHANNEL_SUBCHANNEL_H */
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