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/*
*
* Copyright 2014, 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/statistics/census_interface.h"
#include <stdio.h>
#include <string.h>
#include "src/core/statistics/census_rpc_stats.h"
#include "src/core/statistics/hash_table.h"
#include "src/core/support/string.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/port_platform.h>
#include <grpc/support/sync.h>
#include <grpc/support/time.h>
/* Struct for a trace annotation. */
typedef struct annotation {
gpr_timespec ts; /* timestamp of the annotation */
char txt[CENSUS_MAX_ANNOTATION_LENGTH + 1]; /* actual txt annotation */
struct annotation* next;
} annotation;
typedef struct trace_obj {
census_op_id id;
gpr_timespec ts;
census_rpc_stats rpc_stats;
char* method;
annotation* annotations;
} trace_obj;
static void trace_obj_destroy(trace_obj* obj) {
annotation* p = obj->annotations;
while (p != NULL) {
annotation* next = p->next;
gpr_free(p);
p = next;
}
gpr_free(obj->method);
gpr_free(obj);
}
static void delete_trace_obj(void* obj) { trace_obj_destroy((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 gpr_uint64 g_id = 0;
static census_ht_key op_id_as_key(census_op_id* id) {
return *(census_ht_key*)id;
}
static gpr_uint64 op_id_2_uint64(census_op_id* id) {
gpr_uint64 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);
{
trace_obj* ret = (trace_obj*)gpr_malloc(sizeof(trace_obj));
memset(ret, 0, sizeof(trace_obj));
g_id++;
memcpy(&ret->id, &g_id, sizeof(census_op_id));
ret->rpc_stats.cnt = 1;
ret->ts = gpr_now();
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;
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) {
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) {
annotation* anno = gpr_malloc(sizeof(annotation));
anno->ts = gpr_now();
{
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) {
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(), 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) {
gpr_log(GPR_INFO, "Initialize census trace store.");
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_log(GPR_INFO, "Shutdown census trace store.");
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); }
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 (trace_obj*)census_ht_find(g_trace_store, op_id_as_key(&op_id));
}
const char* census_get_trace_method_name(const trace_obj* trace) {
return (const char*)trace->method;
}
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