forked from spf13/viper
-
Notifications
You must be signed in to change notification settings - Fork 0
/
util.go
223 lines (193 loc) · 5.03 KB
/
util.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
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// Viper is a application configuration system.
// It believes that applications can be configured a variety of ways
// via flags, ENVIRONMENT variables, configuration files retrieved
// from the file system, or a remote key/value store.
package viper
import (
"fmt"
"log/slog"
"os"
"path/filepath"
"runtime"
"strings"
"unicode"
"github.com/spf13/cast"
)
// ConfigParseError denotes failing to parse configuration file.
type ConfigParseError struct {
err error
}
// Error returns the formatted configuration error.
func (pe ConfigParseError) Error() string {
return fmt.Sprintf("While parsing config: %s", pe.err.Error())
}
// Unwrap returns the wrapped error.
func (pe ConfigParseError) Unwrap() error {
return pe.err
}
// toCaseInsensitiveValue checks if the value is a map;
// if so, create a copy and lower-case the keys recursively.
func toCaseInsensitiveValue(value any) any {
switch v := value.(type) {
case map[any]any:
value = copyAndInsensitiviseMap(cast.ToStringMap(v))
case map[string]any:
value = copyAndInsensitiviseMap(v)
}
return value
}
// copyAndInsensitiviseMap behaves like insensitiviseMap, but creates a copy of
// any map it makes case insensitive.
func copyAndInsensitiviseMap(m map[string]any) map[string]any {
nm := make(map[string]any)
for key, val := range m {
lkey := strings.ToLower(key)
switch v := val.(type) {
case map[any]any:
nm[lkey] = copyAndInsensitiviseMap(cast.ToStringMap(v))
case map[string]any:
nm[lkey] = copyAndInsensitiviseMap(v)
default:
nm[lkey] = v
}
}
return nm
}
func insensitiviseVal(val any) any {
switch v := val.(type) {
case map[any]any:
// nested map: cast and recursively insensitivise
val = cast.ToStringMap(val)
insensitiviseMap(val.(map[string]any))
case map[string]any:
// nested map: recursively insensitivise
insensitiviseMap(v)
case []any:
// nested array: recursively insensitivise
insensitiveArray(v)
}
return val
}
func insensitiviseMap(m map[string]any) {
for key, val := range m {
val = insensitiviseVal(val)
lower := strings.ToLower(key)
if key != lower {
// remove old key (not lower-cased)
delete(m, key)
}
// update map
m[lower] = val
}
}
func insensitiveArray(a []any) {
for i, val := range a {
a[i] = insensitiviseVal(val)
}
}
func absPathify(logger *slog.Logger, inPath string) string {
logger.Info("trying to resolve absolute path", "path", inPath)
if inPath == "$HOME" || strings.HasPrefix(inPath, "$HOME"+string(os.PathSeparator)) {
inPath = userHomeDir() + inPath[5:]
}
inPath = os.ExpandEnv(inPath)
if filepath.IsAbs(inPath) {
return filepath.Clean(inPath)
}
p, err := filepath.Abs(inPath)
if err == nil {
return filepath.Clean(p)
}
logger.Error(fmt.Errorf("could not discover absolute path: %w", err).Error())
return ""
}
func stringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}
func userHomeDir() string {
if runtime.GOOS == "windows" {
home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
if home == "" {
home = os.Getenv("USERPROFILE")
}
return home
}
return os.Getenv("HOME")
}
func safeMul(a, b uint) uint {
c := a * b
if a > 1 && b > 1 && c/b != a {
return 0
}
return c
}
// parseSizeInBytes converts strings like 1GB or 12 mb into an unsigned integer number of bytes.
func parseSizeInBytes(sizeStr string) uint {
sizeStr = strings.TrimSpace(sizeStr)
lastChar := len(sizeStr) - 1
multiplier := uint(1)
if lastChar > 0 {
if sizeStr[lastChar] == 'b' || sizeStr[lastChar] == 'B' {
if lastChar > 1 {
switch unicode.ToLower(rune(sizeStr[lastChar-1])) {
case 'k':
multiplier = 1 << 10
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1])
case 'm':
multiplier = 1 << 20
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1])
case 'g':
multiplier = 1 << 30
sizeStr = strings.TrimSpace(sizeStr[:lastChar-1])
default:
multiplier = 1
sizeStr = strings.TrimSpace(sizeStr[:lastChar])
}
}
}
}
size := cast.ToInt(sizeStr)
if size < 0 {
size = 0
}
return safeMul(uint(size), multiplier)
}
// deepSearch scans deep maps, following the key indexes listed in the
// sequence "path".
// The last value is expected to be another map, and is returned.
//
// In case intermediate keys do not exist, or map to a non-map value,
// a new map is created and inserted, and the search continues from there:
// the initial map "m" may be modified!
func deepSearch(m map[string]any, path []string) map[string]any {
for _, k := range path {
m2, ok := m[k]
if !ok {
// intermediate key does not exist
// => create it and continue from there
m3 := make(map[string]any)
m[k] = m3
m = m3
continue
}
m3, ok := m2.(map[string]any)
if !ok {
// intermediate key is a value
// => replace with a new map
m3 = make(map[string]any)
m[k] = m3
}
// continue search from here
m = m3
}
return m
}