ceph/src/jaegertracing/jaeger-client-cpp/src/jaegertracing/utils/EnvVariable.h

   1 /*
   2  * Copyright (c) 2019 The Jaeger Authors.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #ifndef JAEGERTRACING_UTILS_ENV_VARIABLE_H
  18 #define JAEGERTRACING_UTILS_ENV_VARIABLE_H
  19
  20 #include <string>
  21 #include <sstream>
  22 #include <algorithm>
  23
  24 namespace jaegertracing {
  25 namespace utils {
  26 namespace EnvVariable {
  27
  28 inline std::string getStringVariable(const char* envVar)
  29 {
  30     const auto rawVariable = std::getenv(envVar);
  31     return std::string(rawVariable ? rawVariable : "");
  32 }
  33
  34 inline std::pair<bool, int> getIntVariable(const char* envVar)
  35 {
  36     const auto rawVariable = std::getenv(envVar);
  37     const std::string variable(rawVariable ? rawVariable : "");
  38     if (!variable.empty()) {
  39         std::istringstream iss(variable);
  40         int intVal = 0;
  41         if (iss >> intVal) {
  42             return std::make_pair(false, intVal);
  43         }
  44     }
  45     return std::make_pair(false, 0);
  46 }
  47
  48 inline std::pair<bool, bool> getBoolVariable(const char* envVar)
  49 {
  50     const auto rawVariable = std::getenv(envVar);
  51     std::string variable(rawVariable ? rawVariable : "");
  52
  53     if (!variable.empty()) {
  54         std::transform(
  55             variable.begin(), variable.end(), variable.begin(), ::tolower);
  56         return std::make_pair(true, (variable == "true"));
  57     }
  58     return std::make_pair(false, false);
  59 }
  60
  61 }  // namespace EnvVariable
  62 }  // namespace utils
  63 }  // namespace jaegertracing
  64
  65 #endif  // JAEGERTRACING_UTILS_ENV_VARIABLE_H