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
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
|
// Copyright 2014 Docker authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the DOCKER-LICENSE file.
package docker
import (
"encoding/json"
"fmt"
"io"
"strconv"
"strings"
)
// Env represents a list of key-pair represented in the form KEY=VALUE.
type Env []string
// Get returns the string value of the given key.
func (env *Env) Get(key string) (value string) {
return env.Map()[key]
}
// Exists checks whether the given key is defined in the internal Env
// representation.
func (env *Env) Exists(key string) bool {
_, exists := env.Map()[key]
return exists
}
// GetBool returns a boolean representation of the given key. The key is false
// whenever its value if 0, no, false, none or an empty string. Any other value
// will be interpreted as true.
func (env *Env) GetBool(key string) (value bool) {
s := strings.ToLower(strings.Trim(env.Get(key), " \t"))
if s == "" || s == "0" || s == "no" || s == "false" || s == "none" {
return false
}
return true
}
// SetBool defines a boolean value to the given key.
func (env *Env) SetBool(key string, value bool) {
if value {
env.Set(key, "1")
} else {
env.Set(key, "0")
}
}
// GetInt returns the value of the provided key, converted to int.
//
// It the value cannot be represented as an integer, it returns -1.
func (env *Env) GetInt(key string) int {
return int(env.GetInt64(key))
}
// SetInt defines an integer value to the given key.
func (env *Env) SetInt(key string, value int) {
env.Set(key, strconv.Itoa(value))
}
// GetInt64 returns the value of the provided key, converted to int64.
//
// It the value cannot be represented as an integer, it returns -1.
func (env *Env) GetInt64(key string) int64 {
s := strings.Trim(env.Get(key), " \t")
val, err := strconv.ParseInt(s, 10, 64)
if err != nil {
return -1
}
return val
}
// SetInt64 defines an integer (64-bit wide) value to the given key.
func (env *Env) SetInt64(key string, value int64) {
env.Set(key, strconv.FormatInt(value, 10))
}
// GetJSON unmarshals the value of the provided key in the provided iface.
//
// iface is a value that can be provided to the json.Unmarshal function.
func (env *Env) GetJSON(key string, iface interface{}) error {
sval := env.Get(key)
if sval == "" {
return nil
}
return json.Unmarshal([]byte(sval), iface)
}
// SetJSON marshals the given value to JSON format and stores it using the
// provided key.
func (env *Env) SetJSON(key string, value interface{}) error {
sval, err := json.Marshal(value)
if err != nil {
return err
}
env.Set(key, string(sval))
return nil
}
// GetList returns a list of strings matching the provided key. It handles the
// list as a JSON representation of a list of strings.
//
// If the given key matches to a single string, it will return a list
// containing only the value that matches the key.
func (env *Env) GetList(key string) []string {
sval := env.Get(key)
if sval == "" {
return nil
}
var l []string
if err := json.Unmarshal([]byte(sval), &l); err != nil {
l = append(l, sval)
}
return l
}
// SetList stores the given list in the provided key, after serializing it to
// JSON format.
func (env *Env) SetList(key string, value []string) error {
return env.SetJSON(key, value)
}
// Set defines the value of a key to the given string.
func (env *Env) Set(key, value string) {
*env = append(*env, key+"="+value)
}
// Decode decodes `src` as a json dictionary, and adds each decoded key-value
// pair to the environment.
//
// If `src` cannot be decoded as a json dictionary, an error is returned.
func (env *Env) Decode(src io.Reader) error {
m := make(map[string]interface{})
if err := json.NewDecoder(src).Decode(&m); err != nil {
return err
}
for k, v := range m {
env.SetAuto(k, v)
}
return nil
}
// SetAuto will try to define the Set* method to call based on the given value.
func (env *Env) SetAuto(key string, value interface{}) {
if fval, ok := value.(float64); ok {
env.SetInt64(key, int64(fval))
} else if sval, ok := value.(string); ok {
env.Set(key, sval)
} else if val, err := json.Marshal(value); err == nil {
env.Set(key, string(val))
} else {
env.Set(key, fmt.Sprintf("%v", value))
}
}
// Map returns the map representation of the env.
func (env *Env) Map() map[string]string {
if len(*env) == 0 {
return nil
}
m := make(map[string]string)
for _, kv := range *env {
parts := strings.SplitN(kv, "=", 2)
if len(parts) == 1 {
m[parts[0]] = ""
} else {
m[parts[0]] = parts[1]
}
}
return m
}
|
