The initializers including this were doing so at the top level, so every object
loaded after them had a `current_application_settings` method. However, if
someone had rack-attack enabled (which was loaded before these initializers), it
would try to load the API, and fail, because `Gitlab::CurrentSettings` didn't
have that method.
To fix this:
1. Don't include `Gitlab::CurrentSettings` at the top level. We do not need
`Object.new.current_application_settings` to work.
2. Make `Gitlab::CurrentSettings` explicitly `extend self`, as we already use it
like that in several places.
3. Change the initializers to use that new form.
The number of forks of a project doesn't change very frequently and
running a COUNT(*) every time this information is requested can be quite
expensive. We also end up running such a COUNT(*) query at least twice
on the homepage of a project.
By caching this data and refreshing it when necessary we can reduce
project homepage loading times by around 60 milliseconds (based on the
timings of https://gitlab.com/gitlab-org/gitlab-ce).
This commit migrates events data in such a way that push events are
stored much more efficiently. This is done by creating a shadow table
called "events_for_migration", and a table called "push_event_payloads"
which is used for storing push data of push events. The background
migration in this commit will copy events from the "events" table into
the "events_for_migration" table, push events in will also have a row
created in "push_event_payloads".
This approach allows us to reclaim space in the next release by simply
swapping the "events" and "events_for_migration" tables, then dropping
the old events (now "events_for_migration") table.
The new table structure is also optimised for storage space, and does
not include the unused "title" column nor the "data" column (since this
data is moved to "push_event_payloads").
== Newly Created Events
Newly created events are inserted into both "events" and
"events_for_migration", both using the exact same primary key value. The
table "push_event_payloads" in turn has a foreign key to the _shadow_
table. This removes the need for recreating and validating the foreign
key after swapping the tables. Since the shadow table also has a foreign
key to "projects.id" we also don't have to worry about orphaned rows.
This approach however does require some additional storage as we're
duplicating a portion of the events data for at least 1 release. The
exact amount is hard to estimate, but for GitLab.com this is expected to
be between 10 and 20 GB at most. The background migration in this commit
deliberately does _not_ update the "events" table as doing so would put
a lot of pressure on PostgreSQL's auto vacuuming system.
== Supporting Both Old And New Events
Application code has also been adjusted to support push events using
both the old and new data formats. This is done by creating a PushEvent
class which extends the regular Event class. Using Rails' Single Table
Inheritance system we can ensure the right class is used for the right
data, which in this case is based on the value of `events.action`. To
support displaying old and new data at the same time the PushEvent class
re-defines a few methods of the Event class, falling back to their
original implementations for push events in the old format.
Once all existing events have been migrated the various push event
related methods can be removed from the Event model, and the calls to
`super` can be removed from the methods in the PushEvent model.
The UI and event atom feed have also been slightly changed to better
handle this new setup, fortunately only a few changes were necessary to
make this work.
== API Changes
The API only displays push data of events in the new format. Supporting
both formats in the API is a bit more difficult compared to the UI.
Since the old push data was not really well documented (apart from one
example that used an incorrect "action" nmae) I decided that supporting
both was not worth the effort, especially since events will be migrated
in a few days _and_ new events are created in the correct format.
* master: (177 commits)
Add changelog
Bump gitlab-shell version to 5.8.0 to fix Git for Windows 2.14
Make contextual sidebar collapsible
Fixed sidebar context header hover colors
Use correct `Environment`-class within `Gitlab` namespace
Remove gl.Activities from Commits page
Move `let` calls inside the `describe` block using them
Add `/assign me` alias support for assigning issuables to oneself
GRPC::Unavailable (< GRPC::BadStatus) is wrapped in a CommandError
Use `broken_storage` in the fs_shards_spec.
Eager load project creators for project dashboards
Memoize a user's personal projects count
Remove redundant query from User#recent_push
Improve checking if projects would be returned
Change spelling of gitlab-shell
Remove unused #tree-holder
Add custom linter for inline JavaScript to haml_lint
Rename user_can_admin? because it's more accurate
Synchronous zanata community contribution translation
Add Korean translation to i18n
...
Sean McGivern
Robert Speicher
Sean McGivern
Robert Schilling
Travis Miller
Maxim Rydkin
Nick Thomas
Toon Claes
Jordan Patterson
Zeger-Jan van de Weg
Rémy Coutable
Robert Speicher
Felipe Artur
Yorick Peterse
Robin Bobbitt
Lin Jen-Shin
Brian Neel
sue445
Mike Greiling
Douwe Maan
Bob Van Landuyt
Toon Claes
Tony
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