1 //
2 //
3 // Copyright 2015 gRPC authors.
4 //
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
8 //
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
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.
16 //
17 //
18
19 #ifndef GRPC_SRC_CORE_UTIL_ENV_H
20 #define GRPC_SRC_CORE_UTIL_ENV_H
21
22 #include <grpc/support/port_platform.h>
23
24 #include <string>
25
26 #include "absl/types/optional.h"
27
28 namespace grpc_core {
29
30 // Gets the environment variable value with the specified name. */
31 absl::optional<std::string> GetEnv(const char* name);
32
33 // Sets the environment with the specified name to the specified value.
34 void SetEnv(const char* name, const char* value);
SetEnv(const char * name,const std::string & value)35 inline void SetEnv(const char* name, const std::string& value) {
36 SetEnv(name, value.c_str());
37 }
38
39 // Deletes the variable name from the environment.
40 void UnsetEnv(const char* name);
41
42 template <typename T>
SetOrUnsetEnv(const char * name,const absl::optional<T> & value)43 void SetOrUnsetEnv(const char* name, const absl::optional<T>& value) {
44 if (value.has_value()) {
45 SetEnv(name, value.value());
46 } else {
47 UnsetEnv(name);
48 }
49 }
50
51 } // namespace grpc_core
52
53 #endif // GRPC_SRC_CORE_UTIL_ENV_H
54