gistfile1.coffee

crypto = require('crypto')
exec   = require('child_process').exec


chomp = () ->
	this.replace(/(\n|\r)+$/, '')

String.prototype.chomp = chomp

class UidGenerator
	constructor: () ->
		
	rollUid: () ->
		shasum = crypto.createHash('sha1')
		shasum.update(process.getuid().toString())
		millis = new Date().getTime() - 1262304000000;
		millis = millis * Math.pow(2, 12)
		id2 = Math.random() * Math.pow(2, 8)
		uid = millis + id2 + Math.random()
		shasum.update(uid.toString())
		return shasum.digest('hex');

	systemUuid: (callback) =>
		exec 'uuid', (err, stdout, stderr) ->
			callback(stdout.chomp())

# specs


module.exports = UidGenerator;
module.exports.ready = new UidGenerator();

if process.env['NODE_ENV'] and process.env['NODE_ENV'].toLowerCase() == 'test'
    require('should')

    describe "uid generator", () ->
      generator = new UidGenerator()
      it "should generate random uids", () ->
      	left = generator.rollUid()
      	right = generator.rollUid()
      	left.should.not.equal(right)

     describe 'uuid generator', () ->
     	generator = new UidGenerator()
     	it "should give back system uuid", (done) ->
     		generator.systemUuid (uuid) ->
     			generator.systemUuid (uuid2) ->
     				uuid.should.not.equal(uuid2)
     				done()