unique_id.go

package util

import (
	"bytes"
	"math/rand"
	"time"
)

// Returns a unique (ish) id we can attach to resources and tfstate files so they don't conflict with each other
// Uses base 62 to generate a 6 character string that's unlikely to collide with the handful of tests we run in
// parallel. Based on code here: http://stackoverflow.com/a/9543797/483528
func UniqueID() string {

	const BASE_62_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
	const UNIQUE_ID_LENGTH = 6 // Should be good for 62^6 = 56+ billion combinations

	var out bytes.Buffer

	rand := rand.New(rand.NewSource(time.Now().UnixNano()))
	for i := 0; i < UNIQUE_ID_LENGTH; i++ {
		out.WriteByte(BASE_62_CHARS[rand.Intn(len(BASE_62_CHARS))])
	}

	return out.String()
}