go-flake generates unique identifiers that are roughly sortable by time.

Flake can run on a cluster of machines and still generate unique IDs without requiring worker coordination.

A Flake ID is a 64-bit integer will the following components:

• 41 bits is the timestamp with millisecond precision
• 10 bits is the host id (uses IP modulo 2^10)
• 13 bits is an auto-incrementing sequence for ID requests within the same millisecond

go get github.com/davidnarayan/go-flake

package main

import (
	"log"
	"github.com/davidnarayan/go-flake"
)

func main() {
	f, err := flake.New()

	if err != nil {
		log.Fatal(err)
	}

	id := f.NextId()
	fmt.Println(id)
	fmt.Println(id.String())
}

This work is based on code and concepts from the following:

• https://blog.twitter.com/2010/announcing-snowflake
• http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram