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ulid.go
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ulid.go
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package ulid
import (
"crypto/rand"
"database/sql/driver"
"encoding/json"
"fmt"
"time"
"github.com/bww/go-util/v1/sort"
"github.com/oklog/ulid/v2"
)
// the reader may need to be pooled if there is significant contention; not sure
// if this is actually necessary or possible for crypto/rand (as opposed to math/rand)
var entropy = ulid.Monotonic(rand.Reader, 0)
var Zero ULID = ULID{}
type ULID ulid.ULID
func New() ULID {
return ULID(ulid.MustNew(ulid.Timestamp(time.Now()), entropy))
}
func Parse(s string) (ULID, error) {
u, err := ulid.Parse(s)
if err != nil {
return Zero, err
} else {
return ULID(u), nil
}
}
func (v ULID) IsZero() bool {
return v == Zero
}
func (v ULID) String() string {
return ulid.ULID(v).String()
}
func (v ULID) Time() time.Time {
return ulid.Time(ulid.ULID(v).Time())
}
func (v ULID) Compare(c sort.Comparable) int {
z := c.(ULID)
for i := 0; i < len(v); i++ {
a, b := v[i], z[i]
if a != b {
return int(a) - int(b)
}
}
return 0
}
func (v ULID) MarshalJSON() ([]byte, error) {
if v == Zero {
return []byte("null"), nil
} else {
return []byte(`"` + v.String() + `"`), nil
}
}
func (v *ULID) UnmarshalJSON(data []byte) error {
r := string(data)
if r == "null" || r == "0" || r == `""` {
copy(v[:], Zero[:])
return nil
}
var s string
err := json.Unmarshal(data, &s)
if err != nil {
return err
}
*v, err = Parse(s)
if err != nil {
return err
}
return nil
}
func (v ULID) Value() (driver.Value, error) {
if v == Zero {
return nil, nil
} else {
return v.String(), nil
}
}
func (v *ULID) Scan(src interface{}) error {
var err error
switch c := src.(type) {
case nil:
*v = Zero
case []byte:
*v, err = Parse(string(c))
case string:
*v, err = Parse(c)
default:
err = fmt.Errorf("Unsupported type: %T", src)
}
return err
}