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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 <grpc/support/port_platform.h>
#include "src/core/lib/debug/trace.h"
#include <string.h>
#include <type_traits>
#include <grpc/grpc.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include "src/core/lib/gpr/env.h"
int grpc_tracer_set_enabled(const char* name, int enabled);
namespace grpc_core {
TraceFlag* TraceFlagList::root_tracer_ = nullptr;
bool TraceFlagList::Set(const char* name, bool enabled) {
TraceFlag* t;
if (0 == strcmp(name, "all")) {
for (t = root_tracer_; t; t = t->next_tracer_) {
t->set_enabled(enabled);
}
} else if (0 == strcmp(name, "list_tracers")) {
LogAllTracers();
} else if (0 == strcmp(name, "refcount")) {
for (t = root_tracer_; t; t = t->next_tracer_) {
if (strstr(t->name_, "refcount") != nullptr) {
t->set_enabled(enabled);
}
}
} else {
bool found = false;
for (t = root_tracer_; t; t = t->next_tracer_) {
if (0 == strcmp(name, t->name_)) {
t->set_enabled(enabled);
found = true;
}
}
// check for unknowns, but ignore "", to allow to GRPC_TRACE=
if (!found && 0 != strcmp(name, "")) {
gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
return false; /* early return */
}
}
return true;
}
void TraceFlagList::Add(TraceFlag* flag) {
flag->next_tracer_ = root_tracer_;
root_tracer_ = flag;
}
void TraceFlagList::LogAllTracers() {
gpr_log(GPR_DEBUG, "available tracers:");
TraceFlag* t;
for (t = root_tracer_; t != nullptr; t = t->next_tracer_) {
gpr_log(GPR_DEBUG, "\t%s", t->name_);
}
}
// Flags register themselves on the list during construction
TraceFlag::TraceFlag(bool default_enabled, const char* name) : name_(name) {
static_assert(std::is_trivially_destructible<TraceFlag>::value,
"TraceFlag needs to be trivially destructible.");
set_enabled(default_enabled);
TraceFlagList::Add(this);
}
} // namespace grpc_core
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 = static_cast<size_t>(end - beg);
s = static_cast<char*>(gpr_malloc(len + 1));
memcpy(s, beg, len);
s[len] = 0;
*ss = static_cast<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 == nullptr) {
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 = nullptr;
size_t nstrings = 0;
size_t i;
split(s, &strings, &nstrings);
for (i = 0; i < nstrings; i++) {
if (strings[i][0] == '-') {
grpc_core::TraceFlagList::Set(strings[i] + 1, false);
} else {
grpc_core::TraceFlagList::Set(strings[i], true);
}
}
for (i = 0; i < nstrings; i++) {
gpr_free(strings[i]);
}
gpr_free(strings);
}
void grpc_tracer_init(const char* env_var) {
char* e = gpr_getenv(env_var);
if (e != nullptr) {
parse(e);
gpr_free(e);
}
}
void grpc_tracer_shutdown(void) {}
int grpc_tracer_set_enabled(const char* name, int enabled) {
return grpc_core::TraceFlagList::Set(name, enabled != 0);
}
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