| /* |
| * |
| * 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; |
| } |