The test-backend parallel test runner system doesn't actually use the
zulip_test database; instead, it creates its own databases off the
zulip_test_template database.
We were accidentally running `tools/generate_fixtures` even when there
are no changes, because this function is shared with the
tools/lib/test_server.py codebase, which needs us to do the work of
creating a test database for it off the zulip_test_template database.
Fixing this saves about 1.5s / 4s of the runtime of a single test.
In this commit we are fixing a kinda serious un-noticed bug with
the way run_db_migrations worked for test db.
Basically run_db_migrations runs new migrations on db (dev or test).
When we talk about the dev platform this process is straight forward.
We have a single DB zulip which was once created and now has some data.
Introduction of new migration causes a schema change or does something
else but bottom line being we just migrate the zulip DB and stuff works
fine.
Now coming to zulip test db (zulip_test) situation is a bit complex
in comparision to dev db. Basically this is because we make use of
what we call zulip_test_template to make test fixture restoration
after tests run fast. Now before we introduced the performance
optimisation of just doing migrations when possible, introduction of
a migration would ideally result in provisioning do a full rebuild of
the test database. When that used to happen sequence of events used to
be something like this:
* Create a zulip_test db from zulip_test_base template (An absolute
basic schema holding)
* Migrate and populate the zulip_test db.
* Create/Re-create zulip_test_template from the latest zulip_test.
Now after we introduced just do migrations instead of full db rebuild
when possible, what used to happen was that zulip_test db got
successfully migrated but when test suites would run they would try to
create zulip_test from zulip_test_template (so that individual tests
don't affect each other on db level).
This is where the problem resides; zulip_test_template wasn't migrated
and we just scrapped zulip_test and re-created it using
zulip_test_template as a template and hence zulip_test will not hold the
latest schema.
This is what we fix in this commit.
The only changes visible at the AST level, checked using
https://github.com/asottile/astpretty, are
zerver/lib/test_fixtures.py:
'\x1b\\[(1|0)m' ↦ '\\x1b\\[(1|0)m'
'\\[[X| ]\\] (\\d+_.+)\n' ↦ '\\[[X| ]\\] (\\d+_.+)\\n'
which is fine because re treats '\\x1b' and '\\n' the same way as
'\x1b' and '\n'.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
This results in a significant optimization in the performance of
re-provisioning Zulip if all that you're doing is rebasing onto a
newer version of master (which just adds new migrations).
The change carries some risk of generating unpleasant-to-debug
situations, because if we merge a buggy migration and then later fix
it, some clients may not have a properly migrated database (and also,
this changes how populate_db commutes with migrations). But it seems
worth it, given how much time is currently wasted by not having this.
Fixes: #9512.
In this commit we are adding run_generate_fixtures_if_required,
a new function which is meant to de-duplicate a bit of code
between test-server and test-backend which is essentially
responsible for rebuilding the test database if that was required.
In this commit we are essentially just refactoring the function
is_template_database_current to be called template_database_status
and adjusting the return values accordingly.
This is essentially a preparatory commit for the upcoming commits
which will essentially enable us to not throw away entire DB and
rebuild from scratch if only running migrations could do the job.
Since the test database is in part controlled by the Zulip settings
files for testing, these settings files should be included in the list
of files that require populate_db to be rerun.
This issue was found due to changes to internal bots.
This should mean that maintaining two Zulip development environments
using the same Git checkout no longer has caching problems keeping
track of the migration status.
Create a generator script to pull lines from a play, enhancing
random lines with emoji, Markdown and other flair.
With numerous contributions from Rein Zustand and Tim Abbott to finish
the project.
Fixes: #1666.
Compare the hash of 'zilencer/management/commands/populate_db' with
'var/populate_db_hash' and 'tools/setup/postgres-init-test-db' with
'var/postgres_init_test_db_hash' and if any comparison fails rebuild
the database.
With fixes from tabbott.
Previously, the generate-fixtures shell script by called into Django
multiple times in order to check whether the database was in a
reasonable state. Since there's a lot of overhead to starting up
Django, this resulted in `test-backend` and `test-js-with-casper`
being quite slow to run a single small test (2.8s or so) even on my
very fast laptop.
We fix this is by moving the checks into a new Python library, so that
we can avoid paying the Django startup overhead 3 times unnecessarily.
The result saves about 1.2s (~40%) from the time required to run a
single backend test.
Fixes#1221.
Tim Abbott
Anders Kaseorg
Aditya Bansal
Anders Kaseorg
neiljp (Neil Pilgrim)
rht
Kiy4h
Darren Fix
Raghav Jajodia
Robert Hönig
Bickio
Tomasz Kolek
Umair Khan
Tomasz Kolek