39 lines
718 B
Go
39 lines
718 B
Go
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package usecase
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import (
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"crypto/rand"
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"encoding/binary"
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"fmt"
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"sync/atomic"
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"time"
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)
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type SystemClock struct{}
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func (SystemClock) Now() time.Time {
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return time.Now().UTC()
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}
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type UUIDGenerator struct{}
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func (UUIDGenerator) NewID() (string, error) {
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var value [16]byte
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if _, err := rand.Read(value[:]); err != nil {
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now := uint64(time.Now().UnixNano())
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binary.BigEndian.PutUint64(value[:8], now)
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binary.BigEndian.PutUint64(value[8:], fallbackUUID.Add(1))
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}
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value[6] = (value[6] & 0x0f) | 0x40
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value[8] = (value[8] & 0x3f) | 0x80
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return fmt.Sprintf(
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"%08x-%04x-%04x-%04x-%012x",
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value[0:4],
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value[4:6],
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value[6:8],
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value[8:10],
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value[10:16],
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), nil
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}
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var fallbackUUID atomic.Uint64
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