guid

guid: based on snowflake, guid is written in golang. Call local function guid.NewIdWorker, will get an id worker. In addition, making generate id as a network service, a client can connect with grpc. Servers information are stored in etcd

Usage of guid:

• Run as network service

  -datacenter-id uint
        data center id
  -etcd string
        etcd endpoints (default "http://127.0.0.1:2379")
  -host string
        server host (default "localhost")
  -path string
        worker id path (default "/snowflake-servers")
  -port int
        server port (default 7609)
  -seq uint
        sequence
  -skip-check
        skip sanity checks
  -worker-id uint
        worker id

• Connect to remote service

    //connect to grpc server
    conn, err := grpc.Dial(fmt.Sprintf("%s:%d", "localhost", 7609), grpc.WithInsecure())
    if err != nil {
        log.Printf("Did not connect: %v", err)
        return
    }
    defer conn.Close()
    c := guid.NewWorkerClient(conn)
    //how many ids you want
    number := uint32(10)
    reply, err := c.GetId(context.Background(), &guid.Request{number})
    if err != nil {
        log.Fatalf("Could not get worker: %v", err)
        return
    }
    log.Printf("Fetch Ids %v\n", reply.Id)

• Local call

    var workerId, datacenterId, sequence uint64 = 0, 1, 2
    idWorker, err := guid.NewIdWorker(workerId, datacenterId, sequence)
    if err != nil {
        log.Println("Failed to make id worker:", err)
        return
    }
    id, err := idWorker.NextId()
    if err != nil {
        log.Println("Failed to get next id:", err)
        return
    }
    fmt.Printf("Fetch Id %d\n", id)