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
|
package main
import (
"fmt"
"log"
"github.com/knadh/koanf/parsers/json"
"github.com/knadh/koanf/providers/file"
"github.com/knadh/koanf/v2"
)
// Global koanf instance. Use . as the key path delimiter. This can be / or anything.
var (
k = koanf.New(".")
parser = json.Parser()
)
func main() {
// Load JSON config.
if err := k.Load(file.Provider("mock/mock.json"), parser); err != nil {
log.Fatalf("error loading config: %v", err)
}
// Structure to unmarshal nested conf to.
type childStruct struct {
Name string `koanf:"name"`
Type string `koanf:"type"`
Empty map[string]string `koanf:"empty"`
GrandChild struct {
Ids []int `koanf:"ids"`
On bool `koanf:"on"`
} `koanf:"grandchild1"`
}
var out childStruct
// Quick unmarshal.
k.Unmarshal("parent1.child1", &out)
fmt.Println(out)
// Unmarshal with advanced config.
out = childStruct{}
k.UnmarshalWithConf("parent1.child1", &out, koanf.UnmarshalConf{Tag: "koanf"})
fmt.Println(out)
// Marshal the instance back to JSON.
// The paser instance can be anything, eg: json.Paser(),
// yaml.Parser() etc.
b, _ := k.Marshal(parser)
fmt.Println(string(b))
}
|
