Provide a way to set MACHINE_ID

[stalniy]

I'm working on cordova based application and want to generate ObjectId in browser. From source code I see that MACHINE_ID is a random number and it means that I potentially may have issues when 2 clients of my application generate the same ObjectId.

In order to overcome this issue I could use cordova-plugin-device, retrieve uuid and use it as MACHINE_ID. That way I will make sure that all my clients generate unique ObjectIds.

Alternatevely it's possible to use userId as MACHINE_ID which is provided by my API.

I can create a PR if you are ok with suggestion:

import ObjectId from 'bson-objectid'

ObjectId.setMachineId(device.uuid)

[williamkapke]

timestamp+machineid+programid+counter produces an amazing amount of entropy so collisions would be pretty phenomenal.

... but, if folks want to specify a machine id- sure they can use it at their own risk! setMachineId will just need to validate that the input is an int. Just know that it will truncate that int to the last 6 hex chars. (That mirrors how the bson lib works)

PRs always welcome!

[stalniy]

In browser MACHINE_ID will be regenerated each time user open/close application, that's why I want to ensure that it's a static unique number for this user which doesn't change

Update:
Cool! I will work on PR tomorrow :)