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timestamp.go
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timestamp.go
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package null
import (
"encoding/json"
"fmt"
"reflect"
"strconv"
"time"
pq "github.com/lib/pq"
)
// Timestamp is helper an even nuller nullable Time.
// It does not consider zero values to be null.
// It will decode to null, not zero, if null.
type Timestamp struct {
pq.NullTime
}
// NewTime creates a new Time
func NewTimestamp(t time.Time, valid bool) Timestamp {
return Timestamp{
NullTime: pq.NullTime{
Time: t,
Valid: valid,
},
}
}
// TimestampFrom creates a new Timestamp that will always be valid.
func TimestampFrom(t time.Time) Timestamp {
return NewTimestamp(t, true)
}
// TimestampFromPtr creates a new Time that be null if i is nil.
func TimestampFromPtr(t *time.Time) Timestamp {
if t == nil {
return NewTimestamp(time.Time{}, false)
}
return NewTimestamp(*t, true)
}
// UnmarshalJSON implements json.Unmarshaler.
// It supports null.Timestamp JSON or nil values
// It also supports unmarshalling a pq.NullTime
func (t *Timestamp) UnmarshalJSON(data []byte) error {
var err error
var v interface{}
var i struct {
Time int64
}
var j struct {
Time int64
Valid bool
}
var s string
json.Unmarshal(data, &v)
switch v.(type) {
case float64:
err = json.Unmarshal(data, &i.Time)
if err == nil {
t.Time = time.Unix(i.Time, 0)
}
case map[string]interface{}:
err = json.Unmarshal(data, &j)
if (err == nil) && j.Valid {
t.Time = time.Unix(j.Time, 0)
}
case string:
err = json.Unmarshal(data, &s)
t.Time, _ = time.Parse(time.RFC3339, s)
case nil:
t.Valid = false
return nil
default:
err = fmt.Errorf("json: cannot unmarshal %v into Go value of type null.Timestamp", reflect.TypeOf(v).Name())
}
t.Valid = err == nil
return err
}
// UnmarshalText implements encoding.TextUnmarshaler.
// It will unmarshal to a null int64 Unix timestamp to time.Time if the input is a blank or not an time.Time.
func (t *Timestamp) UnmarshalText(text []byte) error {
str := string(text)
if str == "" || str == "null" {
t.Valid = false
return nil
}
var (
err error
i int64
)
i, err = strconv.ParseInt(str, 0, 64)
if err == nil {
t.Time = time.Unix(i, 0)
}
t.Valid = err == nil
return err
}
// MarshalJSON implements json.Marshaler.
func (t Timestamp) MarshalJSON() ([]byte, error) {
if !t.Valid {
return []byte("null"), nil
}
return []byte(strconv.FormatInt(t.Time.Unix(), 10)), nil
}
// MarshalText implements encoding.TextMarshaler.
// It will encode a blank string if this Timestamp is null.
func (t Timestamp) MarshalText() ([]byte, error) {
if !t.Valid {
return []byte{}, nil
}
return []byte(strconv.FormatInt(t.Time.Unix(), 10)), nil
}
// SetValid changes this Timestamp's value and also sets it to be non-null.
func (t *Timestamp) SetValid(n time.Time) {
t.Time = n
t.Valid = true
}
// Ptr returns a pointer to this Timestamp's value, or a nil pointer if this Timestamp is null.
func (t Timestamp) Ptr() *time.Time {
if !t.Valid {
return nil
}
return &t.Time
}
// IsZero returns true for invalid Timestamps, for future omitempty support (Go 1.4?)
func (t Timestamp) IsZero() bool {
return !t.Valid
}