3 * Copyright 2015 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #include <grpc/support/port_platform.h>
21 #include "src/core/lib/debug/trace.h"
24 #include <type_traits>
26 #include <grpc/grpc.h>
27 #include <grpc/support/alloc.h>
28 #include <grpc/support/log.h>
29 #include "src/core/lib/gpr/env.h"
31 int grpc_tracer_set_enabled(const char* name, int enabled);
35 TraceFlag* TraceFlagList::root_tracer_ = nullptr;
37 bool TraceFlagList::Set(const char* name, bool enabled) {
39 if (0 == strcmp(name, "all")) {
40 for (t = root_tracer_; t; t = t->next_tracer_) {
41 t->set_enabled(enabled);
43 } else if (0 == strcmp(name, "list_tracers")) {
45 } else if (0 == strcmp(name, "refcount")) {
46 for (t = root_tracer_; t; t = t->next_tracer_) {
47 if (strstr(t->name_, "refcount") != nullptr) {
48 t->set_enabled(enabled);
53 for (t = root_tracer_; t; t = t->next_tracer_) {
54 if (0 == strcmp(name, t->name_)) {
55 t->set_enabled(enabled);
59 // check for unknowns, but ignore "", to allow to GRPC_TRACE=
60 if (!found && 0 != strcmp(name, "")) {
61 gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
62 return false; /* early return */
68 void TraceFlagList::Add(TraceFlag* flag) {
69 flag->next_tracer_ = root_tracer_;
73 void TraceFlagList::LogAllTracers() {
74 gpr_log(GPR_DEBUG, "available tracers:");
76 for (t = root_tracer_; t != nullptr; t = t->next_tracer_) {
77 gpr_log(GPR_DEBUG, "\t%s", t->name_);
81 // Flags register themselves on the list during construction
82 TraceFlag::TraceFlag(bool default_enabled, const char* name) : name_(name) {
83 static_assert(std::is_trivially_destructible<TraceFlag>::value,
84 "TraceFlag needs to be trivially destructible.");
85 set_enabled(default_enabled);
86 TraceFlagList::Add(this);
89 } // namespace grpc_core
91 static void add(const char* beg, const char* end, char*** ss, size_t* ns) {
96 GPR_ASSERT(end >= beg);
97 len = static_cast<size_t>(end - beg);
98 s = static_cast<char*>(gpr_malloc(len + 1));
101 *ss = static_cast<char**>(gpr_realloc(*ss, sizeof(char**) * np));
106 static void split(const char* s, char*** ss, size_t* ns) {
107 const char* c = strchr(s, ',');
109 add(s, s + strlen(s), ss, ns);
112 split(c + 1, ss, ns);
116 static void parse(const char* s) {
117 char** strings = nullptr;
120 split(s, &strings, &nstrings);
122 for (i = 0; i < nstrings; i++) {
123 if (strings[i][0] == '-') {
124 grpc_core::TraceFlagList::Set(strings[i] + 1, false);
126 grpc_core::TraceFlagList::Set(strings[i], true);
130 for (i = 0; i < nstrings; i++) {
131 gpr_free(strings[i]);
136 void grpc_tracer_init(const char* env_var) {
137 char* e = gpr_getenv(env_var);
144 void grpc_tracer_shutdown(void) {}
146 int grpc_tracer_set_enabled(const char* name, int enabled) {
147 return grpc_core::TraceFlagList::Set(name, enabled != 0);