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
|
/*
*
* 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.
*
*/
#include "src/core/ext/census/grpc_filter.h"
#include <stdio.h>
#include <string.h>
#include <grpc/census.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/slice.h>
#include <grpc/support/time.h>
#include "src/core/ext/census/census_interface.h"
#include "src/core/ext/census/census_rpc_stats.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/transport/static_metadata.h"
typedef struct call_data {
census_op_id op_id;
census_context *ctxt;
gpr_timespec start_ts;
int error;
/* recv callback */
grpc_metadata_batch *recv_initial_metadata;
grpc_closure *on_done_recv;
grpc_closure finish_recv;
} call_data;
typedef struct channel_data { uint8_t unused; } channel_data;
static void extract_and_annotate_method_tag(grpc_metadata_batch *md,
call_data *calld,
channel_data *chand) {
grpc_linked_mdelem *m;
for (m = md->list.head; m != NULL; m = m->next) {
if (m->md->key == GRPC_MDSTR_PATH) {
gpr_log(GPR_DEBUG, "%s",
(const char *)GPR_SLICE_START_PTR(m->md->value->slice));
/* Add method tag here */
}
}
}
static void client_mutate_op(grpc_call_element *elem,
grpc_transport_stream_op *op) {
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
if (op->send_initial_metadata) {
extract_and_annotate_method_tag(op->send_initial_metadata, calld, chand);
}
}
static void client_start_transport_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
client_mutate_op(elem, op);
grpc_call_next_op(exec_ctx, elem, op);
}
static void server_on_done_recv(grpc_exec_ctx *exec_ctx, void *ptr,
bool success) {
grpc_call_element *elem = ptr;
call_data *calld = elem->call_data;
channel_data *chand = elem->channel_data;
if (success) {
extract_and_annotate_method_tag(calld->recv_initial_metadata, calld, chand);
}
calld->on_done_recv->cb(exec_ctx, calld->on_done_recv->cb_arg, success);
}
static void server_mutate_op(grpc_call_element *elem,
grpc_transport_stream_op *op) {
call_data *calld = elem->call_data;
if (op->recv_initial_metadata) {
/* substitute our callback for the op callback */
calld->recv_initial_metadata = op->recv_initial_metadata;
calld->on_done_recv = op->recv_initial_metadata_ready;
op->recv_initial_metadata_ready = &calld->finish_recv;
}
}
static void server_start_transport_op(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_transport_stream_op *op) {
/* TODO(ctiller): this code fails. I don't know why. I expect it's
incomplete, and someone should look at it soon.
call_data *calld = elem->call_data;
GPR_ASSERT((calld->op_id.upper != 0) || (calld->op_id.lower != 0)); */
server_mutate_op(elem, op);
grpc_call_next_op(exec_ctx, elem, op);
}
static void client_init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
memset(d, 0, sizeof(*d));
d->start_ts = gpr_now(GPR_CLOCK_REALTIME);
}
static void client_destroy_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
const grpc_call_stats *stats,
void *ignored) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
/* TODO(hongyu): record rpc client stats and census_rpc_end_op here */
}
static void server_init_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
grpc_call_element_args *args) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
memset(d, 0, sizeof(*d));
d->start_ts = gpr_now(GPR_CLOCK_REALTIME);
/* TODO(hongyu): call census_tracing_start_op here. */
grpc_closure_init(&d->finish_recv, server_on_done_recv, elem);
}
static void server_destroy_call_elem(grpc_exec_ctx *exec_ctx,
grpc_call_element *elem,
const grpc_call_stats *stats,
void *ignored) {
call_data *d = elem->call_data;
GPR_ASSERT(d != NULL);
/* TODO(hongyu): record rpc server stats and census_tracing_end_op here */
}
static void init_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem,
grpc_channel_element_args *args) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(chand != NULL);
}
static void destroy_channel_elem(grpc_exec_ctx *exec_ctx,
grpc_channel_element *elem) {
channel_data *chand = elem->channel_data;
GPR_ASSERT(chand != NULL);
}
const grpc_channel_filter grpc_client_census_filter = {
client_start_transport_op,
grpc_channel_next_op,
sizeof(call_data),
client_init_call_elem,
grpc_call_stack_ignore_set_pollset,
client_destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"census-client"};
const grpc_channel_filter grpc_server_census_filter = {
server_start_transport_op,
grpc_channel_next_op,
sizeof(call_data),
server_init_call_elem,
grpc_call_stack_ignore_set_pollset,
server_destroy_call_elem,
sizeof(channel_data),
init_channel_elem,
destroy_channel_elem,
grpc_call_next_get_peer,
"census-server"};
|