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97 lines
2.6 KiB
97 lines
2.6 KiB
package mcrypto
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import (
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"bytes"
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"context"
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"crypto/rand"
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"encoding/binary"
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"encoding/hex"
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"encoding/json"
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"errors"
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"time"
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"github.com/mediocregopher/mediocre-go-lib/mctx"
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"github.com/mediocregopher/mediocre-go-lib/merr"
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)
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var errMalformedUUID = errors.New("malformed UUID string")
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// UUID is a universally unique identifier which embeds within it a timestamp.
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//
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// Only Unmarshal methods should be called on the zero UUID value.
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//
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// Comparing the equality of two UUID's should always be done using the Equal
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// method, or by comparing their string forms.
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//
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// The string form of UUIDs (returned by String or MarshalText) are
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// lexigraphically order-able by their embedded timestamp.
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type UUID struct {
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b []byte
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}
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// NewUUID populates and returns a new UUID instance which embeds the given time
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func NewUUID(t time.Time) UUID {
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b := make([]byte, 16)
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binary.BigEndian.PutUint64(b[:8], uint64(t.UnixNano()))
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if _, err := rand.Read(b[8:]); err != nil {
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panic(err)
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}
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return UUID{b: b}
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}
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func (u UUID) String() string {
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return uuidV0 + hex.EncodeToString(u.b)
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}
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// Equal returns whether or not the two UUID's are the same value
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func (u UUID) Equal(u2 UUID) bool {
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return bytes.Equal(u.b, u2.b)
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}
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// Time unpacks and returns the timestamp embedded in the UUID
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func (u UUID) Time() time.Time {
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unixNano := int64(binary.BigEndian.Uint64(u.b[:8]))
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return time.Unix(0, unixNano).Local()
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}
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// KV implements the method for the mlog.KVer interface
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func (u UUID) KV() map[string]interface{} {
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return map[string]interface{}{"uuid": u.String()}
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}
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// MarshalText implements the method for the encoding.TextMarshaler interface
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func (u UUID) MarshalText() ([]byte, error) {
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return []byte(u.String()), nil
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}
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// UnmarshalText implements the method for the encoding.TextUnmarshaler
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// interface
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func (u *UUID) UnmarshalText(b []byte) error {
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str := string(b)
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strEnc, ok := stripPrefix(str, uuidV0)
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if !ok || len(strEnc) != hex.EncodedLen(16) {
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ctx := mctx.Annotate(context.Background(), "uuidStr", str)
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return merr.Wrap(errMalformedUUID, ctx)
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}
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b, err := hex.DecodeString(strEnc)
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if err != nil {
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ctx := mctx.Annotate(context.Background(), "uuidStr", str)
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return merr.Wrap(errMalformedUUID, ctx)
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}
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u.b = b
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return nil
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}
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// MarshalJSON implements the method for the json.Marshaler interface
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func (u UUID) MarshalJSON() ([]byte, error) {
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return json.Marshal(u.String())
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}
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// UnmarshalJSON implements the method for the json.Unmarshaler interface
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func (u *UUID) UnmarshalJSON(b []byte) error {
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var s string
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if err := json.Unmarshal(b, &s); err != nil {
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return err
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}
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return u.UnmarshalText([]byte(s))
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}
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