-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
config.go
190 lines (153 loc) · 3.41 KB
/
config.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
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
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
package config
import (
"errors"
"fmt"
"os"
"sync"
)
var (
config Config
// ErrNoValueFound it's the error when no value is found.
ErrNoValueFound = errors.New("Value not found for the given key")
)
// Config is the struct for the config.
type Config struct {
sync.RWMutex
data map[interface{}]interface{}
middlewares []Middleware
parsed bool
}
// Get returns a config value by key or nil.
func (c *Config) Get(key interface{}) interface{} {
c.RLock()
defer c.RUnlock()
return c.data[key]
}
// Set will set a config value by key.
func (c *Config) Set(key interface{}, value interface{}) {
c.Lock()
defer c.Unlock()
if c.data == nil {
c.data = make(map[interface{}]interface{})
}
c.data[key] = value
}
// Data returns all config values.
func (c *Config) Data() map[interface{}]interface{} {
c.RLock()
defer c.RUnlock()
return c.data
}
// Middlewares returns a existing middlewares.
func (c *Config) Middlewares() []Middleware {
c.RLock()
defer c.RUnlock()
return c.middlewares
}
// Reset will reset the config instance.
func Reset() {
config = Config{}
}
// Use adds a middleware to the stack list.
func Use(middleware ...Middleware) {
config.Lock()
defer config.Unlock()
// Remove unwanted middlewares.
for i, m := range middleware {
if m == nil {
middleware = append(middleware[:i], middleware[i+1:]...)
}
}
// Replace old middleware with a new one if the has the same id.
for i1, m1 := range config.middlewares {
for i2, m2 := range middleware {
if m1.ID() == m2.ID() {
config.middlewares[i1] = m2
middleware = append(middleware[:i2], middleware[i2+1:]...)
}
}
}
config.middlewares = append(config.middlewares, middleware...)
// Stop program if a middleware failes to setup.
for _, middleware := range config.middlewares {
err := middleware.Setup()
if err != nil {
fmt.Fprintf(os.Stderr, "Forced to abort because %T is failing to setup: %v\n", middleware, err)
os.Exit(1)
}
}
// Be sure to reset config data since we adds a new middleware.
config.data = make(map[interface{}]interface{})
}
// value loops through all middlewares to find the first value by key from a middleware.
func (c *Config) value(key string, typ valueType) (interface{}, error) {
var value interface{}
var err error
if v := config.Get(key); v != nil {
return v, nil
}
for _, middleware := range config.Middlewares() {
switch typ {
case boolType:
o, err := middleware.Bool(key)
if err != nil || o == false {
continue
}
value = o
break
case floatType:
o, err := middleware.Float(key)
if err != nil || o == 0.0 {
continue
}
value = o
break
case intType:
o, err := middleware.Int(key)
if err != nil || o == 0 {
continue
}
value = o
break
case interfaceType:
o, err := middleware.Get(key)
if err != nil || o == nil {
continue
}
value = o
break
case listType:
o, err := middleware.List(key)
if err != nil || len(o) == 0 {
continue
}
value = o
break
case stringType:
o, err := middleware.String(key)
if err != nil || o == "" {
continue
}
value = o
break
case uintType:
o, err := middleware.Uint(key)
if err != nil || o == uint64(0) {
continue
}
value = o
break
}
if value != nil {
break
}
}
if err != nil {
return nil, err
}
if value == nil {
return nil, ErrNoValueFound
}
config.Set(key, value)
return value, nil
}