Before, every time a password was tested, the dictionaries were parsed
again by zxcvbn.
Parsing dictionaries is slow: it may take up to ~1s. This doesn't matter
that much in production, but it makes tests very slow (because we tend
to create a lot of User records).
With this changes, the initializer tester is shared between calls, class
instances and threads. It is lazily loaded on first use, in order not to
slow down the application boot sequence.
This uses ~20 Mo of memory (only once for all threads), but makes tests
more that twice faster.
For instance, model tests go from **8m 21s** to **3m 26s**.
NB:
An additionnal optimization could be to preload the tester on
boot, before workers are forked, to take advantage of Puma copy-on-write
mechanism. In this way all forked workers would use the same cached
instance.
But:
- We're not actually sure this would work properly. What if Ruby updates
an interval ivar on the class, and this forces the OS to copy the
whole data structure in each fork?
- Puma phased restarts are not compatible with copy-on-write anyway.
So we're avoiding this optimisation for now, and take the extra 20 Mo
per worker.
instead of looking linked user by email because :
- follows FC recommendation to fetch ds account by openid
- the email is not a valid key as many user can share the same FCI email.
The following scenario is now working
A user A (email: 1@mail.com) uses FC to connect to DS
=> It is connected as 1@mail.com
Another user B (email: generic@mail.com) uses FC to connect
=> It is connected as generic@mail.com
The first user A change its FC email to generic@mail.com and connect to DS
=> It is still connected as 1@mail.com
