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// 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.
#ifndef GRPC_SRC_CORE_LIB_CONFIG_LOAD_CONFIG_H
#define GRPC_SRC_CORE_LIB_CONFIG_LOAD_CONFIG_H
#include <grpc/support/port_platform.h>
#include <stdint.h>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include "y_absl/flags/flag.h"
#include "y_absl/strings/string_view.h"
#include "y_absl/types/optional.h"
namespace grpc_core {
TString LoadConfigFromEnv(y_absl::string_view environment_variable,
const char* default_value);
int32_t LoadConfigFromEnv(y_absl::string_view environment_variable,
int32_t default_value);
bool LoadConfigFromEnv(y_absl::string_view environment_variable,
bool default_value);
template <typename T, typename D>
T LoadConfig(const y_absl::Flag<y_absl::optional<T>>& flag,
y_absl::string_view environment_variable,
const y_absl::optional<T>& override, D default_value) {
if (override.has_value()) return *override;
auto from_flag = y_absl::GetFlag(flag);
if (from_flag.has_value()) return std::move(*from_flag);
return LoadConfigFromEnv(environment_variable, default_value);
}
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_CONFIG_LOAD_CONFIG_H
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