structool

package main

import (
	"fmt"
	"net"
	"time"

	"github.com/RussellLuo/structool"
)

func main() {
	in := map[string]interface{}{
		"string":   "s",
		"bool":     true,
		"int_str":  "10",
		"int":      1,
		"error":    "oops",
		"time":     "2021-09-29T00:00:00Z",
		"duration": "2s",
		"ip":       "192.168.0.1",
	}
	out := struct {
		String   string        `structool:"string"`
		Bool     bool          `structool:"bool"`
		IntStr   int           `structool:"int_str"`
		Int      int           `structool:"int"`
		Error    error         `structool:"error"`
		Time     time.Time     `structool:"time"`
		Duration time.Duration `structool:"duration"`
		IP       net.IP        `structool:"ip"`
	}{}

	codec := structool.New().DecodeHook(
		structool.DecodeStringToError,
		structool.DecodeStringToTime(time.RFC3339),
		structool.DecodeStringToDuration,
		structool.DecodeStringToIP,
		structool.DecodeStringToNumber,
	)
	if err := codec.Decode(in, &out); err != nil {
		panic(err)
	}

	fmt.Printf("%+v\n", out)

}

Output:
{String:s Bool:true IntStr:10 Int:1 Error:oops Time:2021-09-29 00:00:00 +0000 UTC Duration:2s IP:192.168.0.1}

package main

import (
	"fmt"
	"time"

	"github.com/RussellLuo/structool"
)

func main() {
	in := "2s"
	var out time.Duration

	codec := structool.New().DecodeHook(structool.DecodeStringToDuration)
	if err := codec.Decode(in, &out); err != nil {
		panic(err)
	}

	fmt.Printf("%#v\n", out)

}

Output:
2000000000

package main

import (
	"fmt"
	"net"
	"time"

	"github.com/RussellLuo/structool"
)

func main() {
	in := struct {
		String   string        `structool:"string"`
		Bool     bool          `structool:"bool"`
		Int      int           `structool:"int"`
		Error    error         `structool:"error"`
		Time     time.Time     `structool:"time"`
		Duration time.Duration `structool:"duration"`
		IP       net.IP        `structool:"ip"`
	}{
		String:   "s",
		Bool:     true,
		Int:      1,
		Error:    fmt.Errorf("oops"),
		Time:     time.Date(2021, 9, 29, 0, 0, 0, 0, time.UTC),
		Duration: 2 * time.Second,
		IP:       net.IPv4(192, 168, 0, 1),
	}

	codec := structool.New().EncodeHook(
		structool.EncodeErrorToString,
		structool.EncodeTimeToString(time.RFC3339),
		structool.EncodeDurationToString,
		structool.EncodeIPToString,
	)
	out, err := codec.Encode(in)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%#v\n", out)

}

Output:
map[string]interface {}{"bool":true, "duration":"2s", "error":"oops", "int":1, "ip":"192.168.0.1", "string":"s", "time":"2021-09-29T00:00:00Z"}

package main

import (
	"fmt"
	"time"

	"github.com/RussellLuo/structool"
)

func main() {
	in := 2 * time.Second

	codec := structool.New().EncodeHook(structool.EncodeDurationToString)
	out, err := codec.Encode(in)
	if err != nil {
		panic(err)
	}

	fmt.Printf("%#v\n", out)

}

Output:
"2s"