Go全局唯一ID选型集合

package main

import (
    "github.com/gofrs/uuid"
    "fmt"
)

func main() {
    // Version 1: 时间 + MAC地址
    id, err := uuid.NewV1()
    if err != nil {
        fmt.Printf("uuid NewUUID err:%+v", err)
    }
    // id: f0629b9a-0cee-11ed-8d44-784f435f60a4 length: 36
    fmt.Println("id:", id.String(), "length:", len(id.String()))

    // Version 4: 纯随机数，错误会在内部引发panic
    id, err = uuid.NewV4()
    if err != nil {
        fmt.Printf("uuid NewUUID err:%+v", err)
    }
    // id: 3b4d1268-9150-447c-a0b7-bbf8c271f6a7 length: 36
    fmt.Println("id:", id.String(), "length:", len(id.String()))
}

package main

import (
    "github.com/lithammer/shortuuid/v4"
    "fmt"
)

func main() {
    id := shortuuid.New()
    // id: iDeUtXY5JymyMSGXqsqLYX length: 22
    fmt.Println("id:", id, "length:", len(id))
    // V22s2vag9bQEZCWcyv5SzL 固定不变
    id = shortuuid.NewWithNamespace("http://127.0.0.1.com")
    // id: K7pnGHAp7WLKUSducPeCXq length: 22
    fmt.Println("id:", id, "length:", len(id))

    // NewWithAlphabet函数可以用于自定义的基础字符串，字符串要求不重复、固定长度57
    str := "12345#$%^&*67890qwerty/;'~!@uiopasdfghjklzxcvbnm,.()_+·"
}

package main

import (
    "github.com/rs/xid"
    "fmt"
    "crypto/md5"
)

func main() {
    // hostname+pid+atomic.AddUint32
    id := xid.New()
    containerName := "test"
    // 由于xid默认使用可重复ip地址填充4 5 6位。
    // 实际场景中，服务都是部署在docker中，这里吧ip地址位替换成了容器名
    // 这里制取了容器名MD5的前3位，验证会重复，放弃使用
    containerNameID := make([]byte, 3)
    hw := md5.New()
    hw.Write([]byte(containerName))
    copy(containerNameID, hw.Sum(nil))
    id[4] = containerNameID[0]
    id[5] = containerNameID[1]
    id[6] = containerNameID[2]

    // id: cbgjhf89htlrr1955d5g length: 12
    fmt.Println("id:", id, "length:", len(id))
}

package main

import (
    "github.com/segmentio/ksuid"
    "fmt"
)

func main() {
    id := ksuid.New()
    // id: 2CWvPg766SUvezbiiV9nzrTZsgf length: 20
    fmt.Println("id:", id, "length:", len(id))

    id1 := ksuid.New()
    id2 := ksuid.New()
    // id1:2CTqTLRxCh48y7oUQzQHrgONT2k id2:2CTqTHf07C09CXyRMHdGKXnY5HP
    fmt.Println(id1, id2)
    // 支持ID对比，这个功能比较鸡肋了,目前没想到有用的地方
    compareResult := ksuid.Compare(id1, id2)
    fmt.Println(compareResult) // 1
    // 判断顺序性
    isSorted := ksuid.IsSorted([]ksuid.KSUID{id2, id1})
    fmt.Println(isSorted) // true 降序
}

package main

import (
    "github.com/oklog/ulid"
    "fmt"
    "time"
    "math/rand"
)

func main() {
    t := time.Now().UTC()
    entropy := rand.New(rand.NewSource(t.UnixNano()))
    id := ulid.MustNew(ulid.Timestamp(t), entropy)
    // id: 01G902ZSM96WV5D5DC5WFHF8WY length: 26
    fmt.Println("id:", id.String(), "length:", len(id.String()))
}

package main

import (
    "fmt"
    "github.com/bwmarrin/snowflake"
)

func main() {
    node, err := snowflake.NewNode(1)
    if err != nil {
        fmt.Println(err)
        return
    }
    id := node.Generate().String()

    // id: 1552614118060462080 length: 19
    fmt.Println("id:", id, "length:", len(id))
}