Bug 168467 – A/B testing

• Component: Web Template Framework
• Status: NEW

[JF Bastien]

I added a quick A/B test hack in bug #168453. We should do this better: factor it out, make it possible to A/B test other things, automatically create the random value, and prevent correlation between decisions.

I'd do the following: template<typename Int> Int abTest(uint32_t uniqueABTestValue, Int minimum, Int maximum);

This returns a value in [minimum, maximum] based on anonymous UUID, and mixes in the unique A/B test value so that each A/B test yields an independent result per user. This is important because users have their own UUID, but we don't want them to all be in the same side of each A/B test! Mixing in a unique A/B test value ensures that each A/B test skews a different way per UUID.

We need to use a simple hash function, so that from crash logs we can reconstruct which A/B test was set, and to which value.