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25 lines
575 B
Go
25 lines
575 B
Go
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package stringutil
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import (
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"fmt"
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"math/rand"
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"sync"
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"time"
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)
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var uuidRand = rand.New(rand.NewSource(time.Now().UnixNano()))
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var uuidMutex = &sync.Mutex{}
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// UUID generates a random UUID according to RFC 4122.
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func UUID() string {
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uuid := make([]byte, 16)
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uuidMutex.Lock()
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_, _ = uuidRand.Read(uuid)
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uuidMutex.Unlock()
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// variant bits; see section 4.1.1
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uuid[8] = uuid[8]&^0xc0 | 0x80
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// version 4 (pseudo-random); see section 4.1.3
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uuid[6] = uuid[6]&^0xf0 | 0x40
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return fmt.Sprintf("%x-%x-%x-%x-%x", uuid[0:4], uuid[4:6], uuid[6:8], uuid[8:10], uuid[10:])
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}
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