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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
*
* 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.
*
*/
#include "src/core/lib/transport/connectivity_state.h"
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
grpc_tracer_flag grpc_connectivity_state_trace =
GRPC_TRACER_INITIALIZER(false, "connectivity_state");
const char *grpc_connectivity_state_name(grpc_connectivity_state state) {
switch (state) {
case GRPC_CHANNEL_INIT:
return "INIT";
case GRPC_CHANNEL_IDLE:
return "IDLE";
case GRPC_CHANNEL_CONNECTING:
return "CONNECTING";
case GRPC_CHANNEL_READY:
return "READY";
case GRPC_CHANNEL_TRANSIENT_FAILURE:
return "TRANSIENT_FAILURE";
case GRPC_CHANNEL_SHUTDOWN:
return "SHUTDOWN";
}
GPR_UNREACHABLE_CODE(return "UNKNOWN");
}
void grpc_connectivity_state_init(grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state init_state,
const char *name) {
gpr_atm_no_barrier_store(&tracker->current_state_atm, init_state);
tracker->current_error = GRPC_ERROR_NONE;
tracker->watchers = NULL;
tracker->name = gpr_strdup(name);
}
void grpc_connectivity_state_destroy(grpc_exec_ctx *exec_ctx,
grpc_connectivity_state_tracker *tracker) {
grpc_error *error;
grpc_connectivity_state_watcher *w;
while ((w = tracker->watchers)) {
tracker->watchers = w->next;
if (GRPC_CHANNEL_SHUTDOWN != *w->current) {
*w->current = GRPC_CHANNEL_SHUTDOWN;
error = GRPC_ERROR_NONE;
} else {
error =
GRPC_ERROR_CREATE_FROM_STATIC_STRING("Shutdown connectivity owner");
}
GRPC_CLOSURE_SCHED(exec_ctx, w->notify, error);
gpr_free(w);
}
GRPC_ERROR_UNREF(tracker->current_error);
gpr_free(tracker->name);
}
grpc_connectivity_state grpc_connectivity_state_check(
grpc_connectivity_state_tracker *tracker) {
grpc_connectivity_state cur =
(grpc_connectivity_state)gpr_atm_no_barrier_load(
&tracker->current_state_atm);
if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) {
gpr_log(GPR_DEBUG, "CONWATCH: %p %s: get %s", tracker, tracker->name,
grpc_connectivity_state_name(cur));
}
return cur;
}
grpc_connectivity_state grpc_connectivity_state_get(
grpc_connectivity_state_tracker *tracker, grpc_error **error) {
grpc_connectivity_state cur =
(grpc_connectivity_state)gpr_atm_no_barrier_load(
&tracker->current_state_atm);
if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) {
gpr_log(GPR_DEBUG, "CONWATCH: %p %s: get %s", tracker, tracker->name,
grpc_connectivity_state_name(cur));
}
if (error != NULL) {
*error = GRPC_ERROR_REF(tracker->current_error);
}
return cur;
}
bool grpc_connectivity_state_has_watchers(
grpc_connectivity_state_tracker *connectivity_state) {
return connectivity_state->watchers != NULL;
}
bool grpc_connectivity_state_notify_on_state_change(
grpc_exec_ctx *exec_ctx, grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state *current, grpc_closure *notify) {
grpc_connectivity_state cur =
(grpc_connectivity_state)gpr_atm_no_barrier_load(
&tracker->current_state_atm);
if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) {
if (current == NULL) {
gpr_log(GPR_DEBUG, "CONWATCH: %p %s: unsubscribe notify=%p", tracker,
tracker->name, notify);
} else {
gpr_log(GPR_DEBUG, "CONWATCH: %p %s: from %s [cur=%s] notify=%p", tracker,
tracker->name, grpc_connectivity_state_name(*current),
grpc_connectivity_state_name(cur), notify);
}
}
if (current == NULL) {
grpc_connectivity_state_watcher *w = tracker->watchers;
if (w != NULL && w->notify == notify) {
GRPC_CLOSURE_SCHED(exec_ctx, notify, GRPC_ERROR_CANCELLED);
tracker->watchers = w->next;
gpr_free(w);
return false;
}
while (w != NULL) {
grpc_connectivity_state_watcher *rm_candidate = w->next;
if (rm_candidate != NULL && rm_candidate->notify == notify) {
GRPC_CLOSURE_SCHED(exec_ctx, notify, GRPC_ERROR_CANCELLED);
w->next = w->next->next;
gpr_free(rm_candidate);
return false;
}
w = w->next;
}
return false;
} else {
if (cur != *current) {
*current = cur;
GRPC_CLOSURE_SCHED(exec_ctx, notify,
GRPC_ERROR_REF(tracker->current_error));
} else {
grpc_connectivity_state_watcher *w =
(grpc_connectivity_state_watcher *)gpr_malloc(sizeof(*w));
w->current = current;
w->notify = notify;
w->next = tracker->watchers;
tracker->watchers = w;
}
return cur == GRPC_CHANNEL_IDLE;
}
}
void grpc_connectivity_state_set(grpc_exec_ctx *exec_ctx,
grpc_connectivity_state_tracker *tracker,
grpc_connectivity_state state,
grpc_error *error, const char *reason) {
grpc_connectivity_state cur =
(grpc_connectivity_state)gpr_atm_no_barrier_load(
&tracker->current_state_atm);
grpc_connectivity_state_watcher *w;
if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) {
const char *error_string = grpc_error_string(error);
gpr_log(GPR_DEBUG, "SET: %p %s: %s --> %s [%s] error=%p %s", tracker,
tracker->name, grpc_connectivity_state_name(cur),
grpc_connectivity_state_name(state), reason, error, error_string);
}
switch (state) {
case GRPC_CHANNEL_INIT:
case GRPC_CHANNEL_CONNECTING:
case GRPC_CHANNEL_IDLE:
case GRPC_CHANNEL_READY:
GPR_ASSERT(error == GRPC_ERROR_NONE);
break;
case GRPC_CHANNEL_SHUTDOWN:
case GRPC_CHANNEL_TRANSIENT_FAILURE:
GPR_ASSERT(error != GRPC_ERROR_NONE);
break;
}
GRPC_ERROR_UNREF(tracker->current_error);
tracker->current_error = error;
if (cur == state) {
return;
}
GPR_ASSERT(cur != GRPC_CHANNEL_SHUTDOWN);
gpr_atm_no_barrier_store(&tracker->current_state_atm, state);
while ((w = tracker->watchers) != NULL) {
*w->current = state;
tracker->watchers = w->next;
if (GRPC_TRACER_ON(grpc_connectivity_state_trace)) {
gpr_log(GPR_DEBUG, "NOTIFY: %p %s: %p", tracker, tracker->name,
w->notify);
}
GRPC_CLOSURE_SCHED(exec_ctx, w->notify,
GRPC_ERROR_REF(tracker->current_error));
gpr_free(w);
}
}
|
