chromium/third_party/grpc/src/src/core/lib/experiments/config.cc

// Copyright 2022 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/experiments/config.h"

#include <string.h>

#include <algorithm>
#include <atomic>
#include <string>

#include "absl/strings/ascii.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_split.h"
#include "absl/strings/string_view.h"

#include <grpc/support/log.h>

#include "src/core/lib/experiments/experiments.h"
#include "src/core/lib/gprpp/crash.h"  // IWYU pragma: keep
#include "src/core/lib/gprpp/global_config.h"
#include "src/core/lib/gprpp/memory.h"
#include "src/core/lib/gprpp/no_destruct.h"

#ifndef GRPC_EXPERIMENTS_ARE_FINAL
GPR_GLOBAL_CONFIG_DEFINE_STRING(
    grpc_experiments, "",
    "List of grpc experiments to enable (or with a '-' prefix to disable).");

namespace grpc_core {

namespace {
struct Experiments { … };

struct ForcedExperiment { … };
ForcedExperiment g_forced_experiments[kNumExperiments];

std::atomic<bool> g_loaded;

GPR_ATTRIBUTE_NOINLINE Experiments LoadExperimentsFromConfigVariable() { … }
}  // namespace

bool IsExperimentEnabled(size_t experiment_id) { … }

void PrintExperimentsList() { … }

void ForceEnableExperiment(absl::string_view experiment, bool enable) { … }

}  // namespace grpc_core
#else
namespace grpc_core {
void PrintExperimentsList() {}
void ForceEnableExperiment(absl::string_view experiment_name, bool) {
  Crash(absl::StrCat("ForceEnableExperiment(\"", experiment_name,
                     "\") called in final build"));
}
}  // namespace grpc_core
#endif