- Add new OverridableConfigRequirement class.
- Add query parameter constant for user links.
- Update Feature Manager with new requirements.
- Use new class for LanguageInHeader requirement.
- Remove LanguageInHeaderTreatmentRequirement class and test.
- Add unit test to cover user links and language in header.
Bug: T285855
Change-Id: I56b729a9e245ed2ddc85625c0be39f5c26320ac4
Before this commit the `languageinheader` query param would only take
effect if the A/B test was enabled AND the query param was set. Per
T282543, we want the query param to take effect regardless of the state
of the language/AB test config.
To see new treatment, set `languageinheader=1`.
To see old treatment, set `languageinheader=0`.
Bug: T282543
Change-Id: I6a06e90b6e46a6fd7506a5ddeaf071b893ebfe8e
* Adds ab test config to enable/disable the ab test. Defaults to `false`
(ab test disabled).
* Adds a `languageinheader` query param which only takes effect when the
ab test is enabled. The query param is cast to a bool and determines
which treatment is shown. For example, set query param to
`languageinheader=1` to see the new treatment. Set query param to
`languageinheader=0` to see the old treatment. To bucket based on the
user's id or global user's id, don't set the query param.
* Moves the language in header config work that was previously in
ServiceWiring into a `LanguageInHeaderTreatmentRequirement` class so
that unit tests can be done on most of the logic that determines whether
the language in header will show.
* Adds logic to bucket user based on [global] user id.
Bug: T280825
Change-Id: Id538fe6e09002fae6c371109769f3b7d61e7ac6d
Address some feedback from I7a2cdc2dfdf20d78e4548f07cf53994563b234b3:
- Miscellaneous documentation improvements.
- Add a false case test to `DynamicConfigRequirement->isMet()`.
Bug: T244481
Change-Id: Ic5637f42da755f871c5a6d545e14effd3ac8c670
We expect the vast majority of requirements and features to be defined
in services as possible. However, there are some "complex" requirements
that require additional application/HTTP request state. Unfortunately,
service wiring is done before some of that state is available.
I65702426 attempted to work around this by requiring clients of the
Feature Manager to pass that additional state on every interaction with
the system. Those complex requirements would then select the parts of
the state that they required when it was required. However
implementations of \IContextSource are God objects and their use should
be limited.
Whilst reviewing I65702426, Stephen Niedzielski mentioned that the
application state being available is a requirement. This remarkably
simple solution:
- Keeps the Requirement interface and FeatureManager API free of God
objects;
- Is true to the nature of the Feature Manager - it makes clear and
centralizes the various checks for application state being available
across the codebase; and
- Inject a Requirement implementations' dependencies at construction
time
It just so happens that the $wgFullyInitialised variable flags whether
the application state is available...
Changes:
- Add the the FeatureManager\Requirements\DynamicConfigRequirement class
and tests. The DynamicConfigRequirement lazily evaluates a single
configuration value whenever ::isMet is invoked
- Register an DynamicConfigRequirement instance, configured to evaluate
$wgFullyInitialised while constructing the Vector.FeatureManager
service
Bug: T244481
Change-Id: I7a2cdc2dfdf20d78e4548f07cf53994563b234b3
