chromium/third_party/grpc/src/src/core/lib/gprpp/global_config_env.h

//
//
// Copyright 2019 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_GPRPP_GLOBAL_CONFIG_ENV_H
#define GRPC_SRC_CORE_LIB_GPRPP_GLOBAL_CONFIG_ENV_H

#include <grpc/support/port_platform.h>

#include <stdint.h>

#include "src/core/lib/gprpp/global_config_generic.h"  // IWYU pragma: export
#include "src/core/lib/gprpp/memory.h"

namespace grpc_core {

GlobalConfigEnvErrorFunctionType;

//
// Set global_config_env_error_function which is called when config system
// encounters errors such as parsing error. What the default function does
// is logging error message.
//
void SetGlobalConfigEnvErrorFunction(GlobalConfigEnvErrorFunctionType func);

// Base class for all classes to access environment variables.
class GlobalConfigEnv { … };

class GlobalConfigEnvBool : public GlobalConfigEnv { … };

class GlobalConfigEnvInt32 : public GlobalConfigEnv { … };

class GlobalConfigEnvString : public GlobalConfigEnv { … };

}  // namespace grpc_core

// Macros for defining global config instances using environment variables.
// This defines a GlobalConfig*Type* instance with arguments for
// mutable variable name and default value.
// Mutable name (g_env_str_##name) is here for having an array
// for the canonical name without dynamic allocation.
// `help` argument is ignored for this implementation.

#define GPR_GLOBAL_CONFIG_DEFINE_BOOL(name, default_value, help) …

#define GPR_GLOBAL_CONFIG_DEFINE_INT32(name, default_value, help) …

#define GPR_GLOBAL_CONFIG_DEFINE_STRING(name, default_value, help) …

#endif  // GRPC_SRC_CORE_LIB_GPRPP_GLOBAL_CONFIG_ENV_H