GoLang中生成UUID唯一标识的实现

go get -u github.com/satori/go.uuid

package main 
import (
    "fmt"
    "github.com/satori/go.uuid"
)
 
func main() {
   id := uuid.NewV4()
   ids := id.String()
}

package utils 
import "fmt"
 
const (
    MAXUINT32 = 4294967295
    DEFAULT_UUID_CNT_CACHE = 512
)
 
type UUIDGenerator struct {
    Prefix       string
    idGen        uint32
    internalChan chan uint32
}
 
func NewUUIDGenerator(prefix string) *UUIDGenerator {
    gen := &UUIDGenerator{
        Prefix:       prefix,
        idGen:        0,
        internalChan: make(chan uint32, DEFAULT_UUID_CNT_CACHE),
    }
    gen.startGen()
    return gen
}
 
//开启 goroutine, 把生成的数字形式的UUID放入缓冲管道
func (this *UUIDGenerator) startGen() {
    go func() {
        for {
            if this.idGen == MAXUINT32 {
                this.idGen = 1
            } else {
                this.idGen += 1
            }
            this.internalChan <- this.idGen
        }
    }()
}
 
//获取带前缀的字符串形式的UUID
func (this *UUIDGenerator) Get() string {
    idgen := <-this.internalChan
    return fmt.Sprintf("%s%d", this.Prefix, idgen)
}
 
//获取uint32形式的UUID
func (this *UUIDGenerator) GetUint32() uint32 {
    return <-this.internalChan
}

package utils 
import (
    "testing"
    "fmt"
)
 
func TestUUIDGenerator(t *testing.T) {
    //新建UUIDGennerator
    UUIDFactory := NewUUIDGenerator("idtest")
 
    //获取UUID
    for i:= 0; i < 50; i++{
        fmt.Println(UUIDFactory.Get())
    }
 
    //获取uint32 形式的UUID
    for i := 0; i < 50; i++{
        fmt.Println(UUIDFactory.GetUint32())
    }
}

go get github.com/satori/go.uuid

Version 1, based on timestamp and MAC address (RFC 4122)
Version 2, based on timestamp, MAC address and POSIX UID/GID (DCE 1.1)
Version 3, based on MD5 hashing (RFC 4122)
Version 4, based on random numbers (RFC 4122)
Version 5, based on SHA-1 hashing (RFC 4122)

package main
import (
    "fmt"
    "github.com/satori/go.uuid"
)
func main() {
    // Creating UUID Version 4
    // panic on error
    u1 := uuid.Must(uuid.NewV4())
    fmt.Printf("UUIDv4: %s\n", u1)
    // or error handling
    u2, err := uuid.NewV4()
    if err != nil {
        fmt.Printf("Something went wrong: %s", err)
        return
    }
    fmt.Printf("UUIDv4: %s\n", u2)
    // Parsing UUID from string input
    u2, err := uuid.FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
    if err != nil {
        fmt.Printf("Something went wrong: %s", err)
    }
    fmt.Printf("Successfully parsed: %s", u2)
}