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// Copyright (c) 2023 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package jsontime
import (
"database/sql"
"database/sql/driver"
"encoding/json"
"errors"
"fmt"
"time"
)
var ErrNotInteger = errors.New("value is not an integer")
func parseTime(data []byte, unixConv func(int64) time.Time, into *time.Time) error {
var val int64
err := json.Unmarshal(data, &val)
if err != nil {
return err
}
if val == 0 {
*into = time.Time{}
} else {
*into = unixConv(val)
}
return nil
}
func anyIntegerToTime(src any, unixConv func(int64) time.Time, into *time.Time) error {
switch v := src.(type) {
case int:
*into = unixConv(int64(v))
case int8:
*into = unixConv(int64(v))
case int16:
*into = unixConv(int64(v))
case int32:
*into = unixConv(int64(v))
case int64:
*into = unixConv(int64(v))
default:
return fmt.Errorf("%w: %T", ErrNotInteger, src)
}
return nil
}
var _ sql.Scanner = &UnixMilli{}
var _ driver.Valuer = UnixMilli{}
type UnixMilli struct {
time.Time
}
func (um UnixMilli) MarshalJSON() ([]byte, error) {
if um.IsZero() {
return []byte{'0'}, nil
}
return json.Marshal(um.UnixMilli())
}
func (um *UnixMilli) UnmarshalJSON(data []byte) error {
return parseTime(data, time.UnixMilli, &um.Time)
}
func (um UnixMilli) Value() (driver.Value, error) {
return um.UnixMilli(), nil
}
func (um *UnixMilli) Scan(src any) error {
return anyIntegerToTime(src, time.UnixMilli, &um.Time)
}
var _ sql.Scanner = &UnixMicro{}
var _ driver.Valuer = UnixMicro{}
type UnixMicro struct {
time.Time
}
func (um UnixMicro) MarshalJSON() ([]byte, error) {
if um.IsZero() {
return []byte{'0'}, nil
}
return json.Marshal(um.UnixMicro())
}
func (um *UnixMicro) UnmarshalJSON(data []byte) error {
return parseTime(data, time.UnixMicro, &um.Time)
}
func (um UnixMicro) Value() (driver.Value, error) {
return um.UnixMicro(), nil
}
func (um *UnixMicro) Scan(src any) error {
return anyIntegerToTime(src, time.UnixMicro, &um.Time)
}
var _ sql.Scanner = &UnixNano{}
var _ driver.Valuer = UnixNano{}
type UnixNano struct {
time.Time
}
func (un UnixNano) MarshalJSON() ([]byte, error) {
if un.IsZero() {
return []byte{'0'}, nil
}
return json.Marshal(un.UnixNano())
}
func (un *UnixNano) UnmarshalJSON(data []byte) error {
return parseTime(data, func(i int64) time.Time {
return time.Unix(0, i)
}, &un.Time)
}
func (un UnixNano) Value() (driver.Value, error) {
return un.UnixNano(), nil
}
func (un *UnixNano) Scan(src any) error {
return anyIntegerToTime(src, func(i int64) time.Time {
return time.Unix(0, i)
}, &un.Time)
}
type Unix struct {
time.Time
}
func (u Unix) MarshalJSON() ([]byte, error) {
if u.IsZero() {
return []byte{'0'}, nil
}
return json.Marshal(u.Unix())
}
var _ sql.Scanner = &Unix{}
var _ driver.Valuer = Unix{}
func (u *Unix) UnmarshalJSON(data []byte) error {
return parseTime(data, func(i int64) time.Time {
return time.Unix(i, 0)
}, &u.Time)
}
func (u Unix) Value() (driver.Value, error) {
return u.Unix(), nil
}
func (u *Unix) Scan(src any) error {
return anyIntegerToTime(src, func(i int64) time.Time {
return time.Unix(i, 0)
}, &u.Time)
}
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