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
|
/*
*
* 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/ext/census/census_tracing.h"
#include "src/core/ext/census/census_interface.h"
#include <stdio.h>
#include <string.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/sync.h>
#include "src/core/ext/census/hash_table.h"
#include "src/core/lib/support/string.h"
void census_trace_obj_destroy(census_trace_obj *obj) {
census_trace_annotation *p = obj->annotations;
while (p != NULL) {
census_trace_annotation *next = p->next;
gpr_free(p);
p = next;
}
gpr_free(obj->method);
gpr_free(obj);
}
static void delete_trace_obj(void *obj) {
census_trace_obj_destroy((census_trace_obj *)obj);
}
static const census_ht_option ht_opt = {
CENSUS_HT_UINT64 /* key type */,
571 /* n_of_buckets */,
NULL /* hash */,
NULL /* compare_keys */,
delete_trace_obj /* delete data */,
NULL /* delete key */
};
static gpr_once g_init_mutex_once = GPR_ONCE_INIT;
static gpr_mu g_mu; /* Guards following two static variables. */
static census_ht *g_trace_store = NULL;
static uint64_t g_id = 0;
static census_ht_key op_id_as_key(census_op_id *id) {
return *(census_ht_key *)id;
}
static uint64_t op_id_2_uint64(census_op_id *id) {
uint64_t ret;
memcpy(&ret, id, sizeof(census_op_id));
return ret;
}
static void init_mutex(void) { gpr_mu_init(&g_mu); }
static void init_mutex_once(void) {
gpr_once_init(&g_init_mutex_once, init_mutex);
}
census_op_id census_tracing_start_op(void) {
gpr_mu_lock(&g_mu);
{
census_trace_obj *ret = gpr_malloc(sizeof(census_trace_obj));
memset(ret, 0, sizeof(census_trace_obj));
g_id++;
memcpy(&ret->id, &g_id, sizeof(census_op_id));
ret->rpc_stats.cnt = 1;
ret->ts = gpr_now(GPR_CLOCK_REALTIME);
census_ht_insert(g_trace_store, op_id_as_key(&ret->id), (void *)ret);
gpr_log(GPR_DEBUG, "Start tracing for id %lu", g_id);
gpr_mu_unlock(&g_mu);
return ret->id;
}
}
int census_add_method_tag(census_op_id op_id, const char *method) {
int ret = 0;
census_trace_obj *trace = NULL;
gpr_mu_lock(&g_mu);
trace = census_ht_find(g_trace_store, op_id_as_key(&op_id));
if (trace == NULL) {
ret = 1;
} else {
trace->method = gpr_strdup(method);
}
gpr_mu_unlock(&g_mu);
return ret;
}
void census_tracing_print(census_op_id op_id, const char *anno_txt) {
census_trace_obj *trace = NULL;
gpr_mu_lock(&g_mu);
trace = census_ht_find(g_trace_store, op_id_as_key(&op_id));
if (trace != NULL) {
census_trace_annotation *anno = gpr_malloc(sizeof(census_trace_annotation));
anno->ts = gpr_now(GPR_CLOCK_REALTIME);
{
char *d = anno->txt;
const char *s = anno_txt;
int n = 0;
for (; n < CENSUS_MAX_ANNOTATION_LENGTH && *s != '\0'; ++n) {
*d++ = *s++;
}
*d = '\0';
}
anno->next = trace->annotations;
trace->annotations = anno;
}
gpr_mu_unlock(&g_mu);
}
void census_tracing_end_op(census_op_id op_id) {
census_trace_obj *trace = NULL;
gpr_mu_lock(&g_mu);
trace = census_ht_find(g_trace_store, op_id_as_key(&op_id));
if (trace != NULL) {
trace->rpc_stats.elapsed_time_ms = gpr_timespec_to_micros(
gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), trace->ts));
gpr_log(GPR_DEBUG, "End tracing for id %lu, method %s, latency %f us",
op_id_2_uint64(&op_id), trace->method,
trace->rpc_stats.elapsed_time_ms);
census_ht_erase(g_trace_store, op_id_as_key(&op_id));
}
gpr_mu_unlock(&g_mu);
}
void census_tracing_init(void) {
init_mutex_once();
gpr_mu_lock(&g_mu);
if (g_trace_store == NULL) {
g_id = 1;
g_trace_store = census_ht_create(&ht_opt);
} else {
gpr_log(GPR_ERROR, "Census trace store already initialized.");
}
gpr_mu_unlock(&g_mu);
}
void census_tracing_shutdown(void) {
gpr_mu_lock(&g_mu);
if (g_trace_store != NULL) {
census_ht_destroy(g_trace_store);
g_trace_store = NULL;
} else {
gpr_log(GPR_ERROR, "Census trace store is not initialized.");
}
gpr_mu_unlock(&g_mu);
}
void census_internal_lock_trace_store(void) { gpr_mu_lock(&g_mu); }
void census_internal_unlock_trace_store(void) { gpr_mu_unlock(&g_mu); }
census_trace_obj *census_get_trace_obj_locked(census_op_id op_id) {
if (g_trace_store == NULL) {
gpr_log(GPR_ERROR, "Census trace store is not initialized.");
return NULL;
}
return (census_trace_obj *)census_ht_find(g_trace_store,
op_id_as_key(&op_id));
}
const char *census_get_trace_method_name(const census_trace_obj *trace) {
return trace->method;
}
static census_trace_annotation *dup_annotation_chain(
census_trace_annotation *from) {
census_trace_annotation *ret = NULL;
census_trace_annotation **to = &ret;
for (; from != NULL; from = from->next) {
*to = gpr_malloc(sizeof(census_trace_annotation));
memcpy(*to, from, sizeof(census_trace_annotation));
to = &(*to)->next;
}
return ret;
}
static census_trace_obj *trace_obj_dup(census_trace_obj *from) {
census_trace_obj *to = NULL;
GPR_ASSERT(from != NULL);
to = gpr_malloc(sizeof(census_trace_obj));
to->id = from->id;
to->ts = from->ts;
to->rpc_stats = from->rpc_stats;
to->method = gpr_strdup(from->method);
to->annotations = dup_annotation_chain(from->annotations);
return to;
}
census_trace_obj **census_get_active_ops(int *num_active_ops) {
census_trace_obj **ret = NULL;
gpr_mu_lock(&g_mu);
if (g_trace_store != NULL) {
size_t n = 0;
census_ht_kv *all_kvs = census_ht_get_all_elements(g_trace_store, &n);
*num_active_ops = (int)n;
if (n != 0) {
size_t i = 0;
ret = gpr_malloc(sizeof(census_trace_obj *) * n);
for (i = 0; i < n; i++) {
ret[i] = trace_obj_dup((census_trace_obj *)all_kvs[i].v);
}
}
gpr_free(all_kvs);
}
gpr_mu_unlock(&g_mu);
return ret;
}
|
