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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/*
*
* Copyright 2016, 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.
*
*/
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/sync.h>
#include <string.h>
#include "src/core/ext/load_reporting/load_reporting.h"
#include "src/core/ext/load_reporting/load_reporting_filter.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/profiling/timers.h"
#include "src/core/lib/transport/static_metadata.h"
typedef struct call_data {
intptr_t id; /**< an id unique to the call */
char *trailing_md_string;
char *initial_md_string;
const char *service_method;
/* stores the recv_initial_metadata op's ready closure, which we wrap with our
* own (on_initial_md_ready) in order to capture the incoming initial metadata
* */
grpc_closure *ops_recv_initial_metadata_ready;
/* to get notified of the availability of the incoming initial metadata. */
grpc_closure on_initial_md_ready;
grpc_metadata_batch *recv_initial_metadata;
} call_data;
typedef struct channel_data {
intptr_t id; /**< an id unique to the channel */
} channel_data;
typedef struct {
grpc_call_element *elem;
grpc_exec_ctx *exec_ctx;
} recv_md_filter_args;
static grpc_mdelem *recv_md_filter(grpc_exec_ctx *exec_ctx, void *user_data,
grpc_mdelem *md) {
recv_md_filter_args *a = user_data;
grpc_call_element *elem = a->elem;
call_data *calld = elem->call_data;
if (md->key == GRPC_MDSTR_PATH) {
calld->service_method = grpc_mdstr_as_c_string(md->value);
} else if (md->key == GRPC_MDSTR_LB_TOKEN) {
calld->initial_md_string = gpr_strdup(grpc_mdstr_as_c_string(md->value));
return NULL;
}
return md;
}
static void on_initial_md_ready(grpc_exec_ctx *exec_ctx, void *user_data,
grpc_error *err) {
grpc_call_element *elem = user_data;
call_data *calld = elem->call_data;
if (err == GRPC_ERROR_NONE) {
recv_md_filter_args a;
a.elem = elem;
a.exec_ctx = exec_ctx;
grpc_metadata_batch_filter(exec_ctx, calld->recv_initial_metadata,
recv_md_filter, &a);
if (calld->service_method == NULL) {
err =
grpc_error_add_child(err, GRPC_ERROR_CREATE("Missing :path header"));
}
} else {
GRPC_ERROR_REF(err);
}
calld->ops_recv_initial_metadata_ready->cb(
exec_ctx, calld->ops_recv_initial_metadata_ready->cb_arg, err);
GRPC_ERROR_UNREF(err);
}
/* Constructor for call_data */
static grpc_error *init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *calld = elem->call_data;
memset(calld, 0, sizeof(call_data));
calld->id = (intptr_t)args->call_stack;
grpc_closure_init(&calld->on_initial_md_ready, on_initial_md_ready, elem,
grpc_schedule_on_exec_ctx);
/* TODO(dgq): do something with the data
channel_data *chand = elem->channel_data;
grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CALL_CREATION,
(intptr_t)chand->id,
(intptr_t)calld->id,
NULL,
NULL,
NULL,
NULL};
*/
return GRPC_ERROR_NONE;
}
/* Destructor for call_data */
static void destroy_call_elem(grpc_exec_ctx *exec_ctx, grpc_call_element *elem,
const grpc_call_final_info *final_info,
void *ignored) {
call_data *calld = elem->call_data;
/* TODO(dgq): do something with the data
channel_data *chand = elem->channel_data;
grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CALL_DESTRUCTION,
(intptr_t)chand->id,
(intptr_t)calld->id,
final_info,
calld->initial_md_string,
calld->trailing_md_string,
calld->service_method};
*/
gpr_free(calld->initial_md_string);
gpr_free(calld->trailing_md_string);
}
/* Constructor for channel_data */
static grpc_error *init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
GPR_ASSERT(!args->is_last);
channel_data *chand = elem->channel_data;
memset(chand, 0, sizeof(channel_data));
chand->id = (intptr_t)args->channel_stack;
/* TODO(dgq): do something with the data
grpc_load_reporting_call_data lr_call_data = {GRPC_LR_POINT_CHANNEL_CREATION,
(intptr_t)chand,
0,
NULL,
NULL,
NULL,
NULL};
*/
return GRPC_ERROR_NONE;
}
/* Destructor for channel data */
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {
/* TODO(dgq): do something with the data
channel_data *chand = elem->channel_data;
grpc_load_reporting_call_data lr_call_data = {
GRPC_LR_POINT_CHANNEL_DESTRUCTION,
(intptr_t)chand->id,
0,
NULL,
NULL,
NULL,
NULL};
*/
}
static grpc_mdelem *lr_trailing_md_filter(grpc_exec_ctx *exec_ctx,
void *user_data, grpc_mdelem *md) {
grpc_call_element *elem = user_data;
call_data *calld = elem->call_data;
if (md->key == GRPC_MDSTR_LB_COST_BIN) {
calld->trailing_md_string = gpr_strdup(grpc_mdstr_as_c_string(md->value));
return NULL;
}
return md;
}
static void lr_start_transport_stream_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
GPR_TIMER_BEGIN("lr_start_transport_stream_op", 0);
call_data *calld = elem->call_data;
if (op->recv_initial_metadata) {
calld->recv_initial_metadata = op->recv_initial_metadata;
/* substitute our callback for the higher callback */
calld->ops_recv_initial_metadata_ready = op->recv_initial_metadata_ready;
op->recv_initial_metadata_ready = &calld->on_initial_md_ready;
} else if (op->send_trailing_metadata) {
grpc_metadata_batch_filter(exec_ctx, op->send_trailing_metadata,
lr_trailing_md_filter, elem);
}
grpc_call_next_op(exec_ctx, elem, op);
GPR_TIMER_END("lr_start_transport_stream_op", 0);
}
const grpc_channel_filter grpc_load_reporting_filter = {
lr_start_transport_stream_op,
grpc_channel_next_op,
sizeof(call_data),
init_call_elem,
grpc_call_stack_ignore_set_pollset_or_pollset_set,
destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
grpc_channel_next_get_info,
"load_reporting"};
|
