aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/ext/client_config/subchannel.h
blob: 0765a544e8b7070ee35d58e009aeb35fb252b417 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/*
 *
 * 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_CONFIG_SUBCHANNEL_H
#define GRPC_CORE_EXT_CLIENT_CONFIG_SUBCHANNEL_H

#include "src/core/ext/client_config/connector.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/transport/connectivity_state.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_subchannel_call *grpc_connected_subchannel_create_call(
    grpc_exec_ctx *exec_ctx, grpc_connected_subchannel *connected_subchannel,
    grpc_pollset *pollset);

/** 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);

/** 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;
  /** 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_CONFIG_SUBCHANNEL_H */