id生成策略

雪花算法生成id

使用https://github.com/bwmarrin/snowflake

package main

import (
 "fmt"

 "github.com/bwmarrin/snowflake"
)

func main() {

 // Create a new Node with a Node number of 1
 node, err := snowflake.NewNode(1)
 if err != nil {
  fmt.Println(err)
  return
 }

 // Generate a snowflake ID.
 id := node.Generate()

 // Print out the ID in a few different ways.
 fmt.Printf("Int64  ID: %d\n", id)
 fmt.Printf("String ID: %s\n", id)
 fmt.Printf("Base2  ID: %s\n", id.Base2())
 fmt.Printf("Base64 ID: %s\n", id.Base64())

 // Print out the ID's timestamp
 fmt.Printf("ID Time  : %d\n", id.Time())

 // Print out the ID's node number
 fmt.Printf("ID Node  : %d\n", id.Node())

 // Print out the ID's sequence number
 fmt.Printf("ID Step  : %d\n", id.Step())

  // Generate and print, all in one.
  fmt.Printf("ID       : %d\n", node.Generate().Int64())
}

生成uuid

package	id	format
github.com/segmentio/ksuid421	0pPKHjWprnVxGH7dEsAoXX2YQvU	4 bytes of time (seconds) + 16 random bytes
github.com/rs/xid960	b50vl5e54p1000fo3gh0	4 bytes of time (seconds) + 3 byte machine id + 2 byte process id + 3 bytes random
github.com/kjk/betterguid96	-Kmdih_fs4ZZccpx2Hl1	8 bytes of time (milliseconds) + 9 random bytes
github.com/sony/sonyflake283	20f8707d6000108	~6 bytes of time (10 ms) + 1 byte sequence + 2 bytes machine id
github.com/oklog/ulid142	01BJMVNPBBZC3E36FJTGVF0C4S	6 bytes of time (milliseconds) + 8 bytes random
github.com/chilts/sid105	1JADkqpWxPx-4qaWY47~FqI	8 bytes of time (ns) + 8 random bytes
github.com/satori/go.uuid582	5b52d72c-82b3-4f8e-beb5-437a974842c	UUIDv4 from RFC 411244 for comparison
https://github.com/edwingeng/wuid	187500764	6 bytes