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/*
*
* 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/lib/debug/trace.h"
#include <string.h>
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/support/env.h"
int grpc_tracer_set_enabled(const char* name, int enabled);
typedef struct tracer {
grpc_tracer_flag* flag;
struct tracer* next;
} tracer;
static tracer* tracers;
#ifdef GRPC_THREADSAFE_TRACER
#define TRACER_SET(flag, on) gpr_atm_no_barrier_store(&(flag).value, (on))
#else
#define TRACER_SET(flag, on) (flag).value = (on)
#endif
void grpc_register_tracer(grpc_tracer_flag* flag) {
tracer* t = (tracer*)gpr_malloc(sizeof(*t));
t->flag = flag;
t->next = tracers;
TRACER_SET(*flag, false);
tracers = t;
}
static void add(const char* beg, const char* end, char*** ss, size_t* ns) {
size_t n = *ns;
size_t np = n + 1;
char* s;
size_t len;
GPR_ASSERT(end >= beg);
len = (size_t)(end - beg);
s = (char*)gpr_malloc(len + 1);
memcpy(s, beg, len);
s[len] = 0;
*ss = (char**)gpr_realloc(*ss, sizeof(char**) * np);
(*ss)[n] = s;
*ns = np;
}
static void split(const char* s, char*** ss, size_t* ns) {
const char* c = strchr(s, ',');
if (c == NULL) {
add(s, s + strlen(s), ss, ns);
} else {
add(s, c, ss, ns);
split(c + 1, ss, ns);
}
}
static void parse(const char* s) {
char** strings = NULL;
size_t nstrings = 0;
size_t i;
split(s, &strings, &nstrings);
for (i = 0; i < nstrings; i++) {
if (strings[i][0] == '-') {
grpc_tracer_set_enabled(strings[i] + 1, 0);
} else {
grpc_tracer_set_enabled(strings[i], 1);
}
}
for (i = 0; i < nstrings; i++) {
gpr_free(strings[i]);
}
gpr_free(strings);
}
static void list_tracers() {
gpr_log(GPR_DEBUG, "available tracers:");
tracer* t;
for (t = tracers; t; t = t->next) {
gpr_log(GPR_DEBUG, "\t%s", t->flag->name);
}
}
void grpc_tracer_init(const char* env_var) {
char* e = gpr_getenv(env_var);
if (e != NULL) {
parse(e);
gpr_free(e);
}
}
void grpc_tracer_shutdown(void) {
while (tracers) {
tracer* t = tracers;
tracers = t->next;
gpr_free(t);
}
}
int grpc_tracer_set_enabled(const char* name, int enabled) {
tracer* t;
if (0 == strcmp(name, "all")) {
for (t = tracers; t; t = t->next) {
TRACER_SET(*t->flag, enabled);
}
} else if (0 == strcmp(name, "list_tracers")) {
list_tracers();
} else if (0 == strcmp(name, "refcount")) {
for (t = tracers; t; t = t->next) {
if (strstr(t->flag->name, "refcount") != NULL) {
TRACER_SET(*t->flag, enabled);
}
}
} else {
int found = 0;
for (t = tracers; t; t = t->next) {
if (0 == strcmp(name, t->flag->name)) {
TRACER_SET(*t->flag, enabled);
found = 1;
}
}
if (!found) {
gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
return 0; /* early return */
}
}
return 1;
}
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