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
|
package main
import (
"fmt"
"log"
"os"
"github.com/knadh/koanf/parsers/toml"
"github.com/knadh/koanf/providers/file"
"github.com/knadh/koanf/providers/posflag"
"github.com/knadh/koanf/v2"
flag "github.com/spf13/pflag"
)
// Global koanf instance. Use "." as the key path delimiter. This can be "/" or any character.
var k = koanf.New(".")
func main() {
// Use the POSIX compliant pflag lib instead of Go's flag lib.
f := flag.NewFlagSet("config", flag.ContinueOnError)
f.Usage = func() {
fmt.Println(f.FlagUsages())
os.Exit(0)
}
// Path to one or more config files to load into koanf along with some config params.
f.StringSlice("conf", []string{"mock/mock.toml"}, "path to one or more .toml config files")
f.String("time", "2020-01-01", "a time string")
f.String("type", "xxx", "type of the app")
f.Parse(os.Args[1:])
// Load the config files provided in the commandline.
cFiles, _ := f.GetStringSlice("conf")
for _, c := range cFiles {
if err := k.Load(file.Provider(c), toml.Parser()); err != nil {
log.Fatalf("error loading file: %v", err)
}
}
// "time" and "type" may have been loaded from the config file, but
// they can still be overridden with the values from the command line.
// The bundled posflag.Provider takes a flagset from the spf13/pflag lib.
// Passing the Koanf instance to posflag helps it deal with default command
// line flag values that are not present in conf maps from previously loaded
// providers.
if err := k.Load(posflag.Provider(f, ".", k), nil); err != nil {
log.Fatalf("error loading config: %v", err)
}
fmt.Println("time is = ", k.String("time"))
}
|
