mod-test.go

package main

import (
	"crypto/md5"
	"fmt"
)

func main() {
	nodes := []string{
		"192.168.1.1:9090", "192.168.1.2:9090", "192.168.1.3:9090", "192.168.1.4:9090",	"192.168.1.5:9090",
		"192.168.1.6:9090", "192.168.1.7:9090", "192.168.1.8:9090", "192.168.1.9:9090", "192.168.1.10:9090",		
	}
	
	for _, ip := range nodes {
	   mod := sum64(md5.Sum([]byte(ip))) % 4
	   fmt.Printf("%s mode is %d \n", ip, mod)
	}
       
}


func sum64(hash [md5.Size]byte) uint64 {
	var s uint64

	for i, b := range hash {
		shift := uint64((md5.Size - i - 1) * 8)

		s |= uint64(b) << shift
	}
	return s
}