| // Copyright Istio 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. |
| |
| package env |
| |
| import ( |
| "os" |
| ) |
| |
| // Variable is a wrapper for an environment variable. |
| type Variable string |
| |
| // Name of the environment variable. |
| func (e Variable) Name() string { |
| return string(e) |
| } |
| |
| // Value of the environment variable. |
| func (e Variable) Value() string { |
| return os.Getenv(e.Name()) |
| } |
| |
| // ValueOrDefault returns the value of the environment variable if it is non-empty. Otherwise returns the value provided. |
| func (e Variable) ValueOrDefault(defaultValue string) string { |
| return e.ValueOrDefaultFunc(func() string { |
| return defaultValue |
| }) |
| } |
| |
| // ValueOrDefaultFunc returns the value of the environment variable if it is non-empty. Otherwise returns the value function provided. |
| func (e Variable) ValueOrDefaultFunc(defaultValueFunc func() string) string { |
| if value := e.Value(); value != "" { |
| return value |
| } |
| return defaultValueFunc() |
| } |