-
Notifications
You must be signed in to change notification settings - Fork 0
/
variable.go
45 lines (38 loc) · 1.42 KB
/
variable.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
// Copyright 2018 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()
}