Eugaia
March 29, 2018, 6:42am
1
Hi,
I’m curious to know how the UUID() function in N1QL works. Can anyone give a rough overview?
Thanks.
Eugaia
March 29, 2018, 12:52pm
3
Thanks for replying.
I’m specifically interested in the UUID() function itself. i.e. How is the full UUID generated? What variables are used to create a unique ID over the whole cluster?
Thanks.
vsr1
March 29, 2018, 12:55pm
4
UUID generates a random UUID according to RFC 4122
func init() {
uuidPool = &sync.Pool{
New: func() interface{} {
b := make([]byte, _UUID_SIZE, _UUID_SIZE)
return b
},
}
}
// UUID generates a random UUID according to RFC 4122
func UUID() (string, error) {
uuid := uuidPool.Get().([]byte)
defer uuidPool.Put(uuid)
n, err := io.ReadFull(rand.Reader, uuid)
if n != len(uuid) || err != nil {
return "", err
}
// variant bits; see section 4.1.1
uuid[8] = uuid[8]&^0xc0 | 0x80
// version 4 (pseudo-random); see section 4.1.3
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