my-log/tools/write_buffer.go

package tools

import (
	"bytes"
	"encoding/json"
	"fmt"
	"strconv"
	"time"
)

func WriteValue(buff *bytes.Buffer, val any) (n int, err error) {
	switch v := val.(type) {
	default:
		err = fmt.Errorf("Unsupported type %T", v)
	case nil:
		return
	case []any:
		var o []byte
		o, err = json.Marshal(v)
		if err == nil {
			return buff.Write(o)
		}
	case map[string]any:
		var o []byte
		o, err = json.Marshal(v)
		if err == nil {
			return buff.Write(o)
		}
	case string:
		return buff.WriteString(v)
	case int:
		return buff.WriteString(strconv.Itoa(v))
	case int64:
		return buff.WriteString(strconv.FormatInt(v, 10))
	case float64:
		return buff.WriteString(strconv.FormatFloat(v, 'f', -1, 64))
	case json.Number:
		return buff.WriteString(v.String())
	case json.RawMessage:
		return buff.Write(v)
	case []byte:
		return buff.Write(v)
	case byte:
		err = buff.WriteByte(v)
		if err == nil {
			n = 1
		}
	case rune:
		return buff.WriteString(string(v))
	case bool:
		return buff.WriteString(strconv.FormatBool(v))
	case time.Time:
		return buff.WriteString(v.Format(time.RFC3339))
	}
	return
}