Golang : Generate universally unique identifier(UUID) example
A UUID ( universally unique identifier ) is a 128-bit string value that is used in developing software. An example of UUID string looks like :
69cda7b3-9a67-47ce-beac-16ce1dc177e0
UUID is commonly used in generating MAC addresses for network interface hardware devices, primary keys identifiers in database to ensure uniqueness in a cluster of database servers and also use in binding registration serial number of shareware/licensed software to customer's computers. In some computer games, UUID is generated on the fly as a way identify objects in the virtual world.
Here are two examples of generating UUID in Golang.
To generate UUID with https://github.com/pborman/uuid
example :
package main
import (
"fmt"
"github.com/pborman/uuid"
)
func main() {
uuid := uuid.New()
fmt.Println(uuid)
}
Sample output :
69cda7b3-9a67-47ce-beac-16ce1dc177e0
and for time based UUID generation example :
package main
import (
"crypto/rand"
"fmt"
"time"
)
func main() {
// generate 32 bits timestamp
unix32bits := uint32(time.Now().UTC().Unix())
buff := make([]byte, 12)
numRead, err := rand.Read(buff)
if numRead != len(buff) || err != nil {
panic(err)
}
fmt.Printf("%x-%x-%x-%x-%x-%x\n", unix32bits, buff[0:2], buff[2:4], buff[4:6], buff[6:8], buff[8:])
}
Sample output :
564e9408-fb78-4856-4215-52e0-e14bb054
References :
https://en.wikipedia.org/wiki/Universallyuniqueidentifier
By Adam Ng
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