To support multiple backend, we need to get rid of `further_work` concept
which is used in multiple places in the MBS code. Before this commit, if
one handler wanted to execute another handler, it planned this work by
constructing fake message and returning it. MBSConsumer then planned
its execution by adding it into the event loop.
In this commit, the new `events.scheduler` instance of new Scheduler
class is used to acomplish this. If handler wants to execute another
handler, it simply schedules it using `events.scheduler.add` method.
In the end of each handler, the `events.scheduler.run` method is
executed which calls all the scheduled handlers.
The idea is that when Celery is enabled, we can change the
`Scheduler.run` method to execute the handlers using the Celery, while
during the local builds, we could execute them directly without Celery.
Use of Scheduler also fixes the issue with ordering of such calls. If
we would call the handlers directly, they could have been executed
in the middle of another handler leading to behavior incompatible
with the current `further_work` concept. Using the Scheduler, these
calls are executed always in the end of the handler no matter when
they have been scheduled.
This patch drops message objects, defined by class BaseMessage and its
subclasses, and pass event info arguments to event handler directly.
Different event handler requires different arguments to handle a kind of
specific event. The event info is parsed from the raw message received
from message bus.
Signed-off-by: Chenxiong Qi <cqi@redhat.com>
Message classes and FedmsgMessageParser are moved into dedicated Python module
under scheduler/ directory.
FedmsgMessageParser is decoupled from messaging.py by initializing a parser
object with known fedmsg services. This decouple avoids cycle import between
parser.py and messaging.py.
Signed-off-by: Chenxiong Qi <cqi@redhat.com>
Please note that this patch does not change the use of database session
in MBS. So, in the frontend, the database session is still managed by
Flask-SQLAlchemy, that is the db.session. And the backend, running event
handlers, has its own database session created from SQLAclehmy session
API directly.
This patch aims to reduce the number of scoped_session created when call
original function make_db_session. For technical detailed information,
please refer to SQLAlchemy documentation Contextual/Thread-local
Sessions.
As a result, a global scoped_session is accessible from the
code running inside backend, both the event handlers and functions
called from handlers. The library code shared by frontend and backend,
like resolvers, has no change.
Similarly, db.session is only used to recreate database for every test.
Signed-off-by: Chenxiong Qi <cqi@redhat.com>
In this commit, when component reuse code finds out that the base module uses
KojiResolver, it uses the `KojiResolver.get_buildrequired_modules` method
to find out possible modules to reuse and limits the original query just
by the IDs of these modules.
In order to do that, this commit splits the original
`KojiResolver.get_buildrequired_modulemds` into two methods:
- The `get_buildrequired_modules` returning the ModuleBuilds.
- The `get_buildrequired_modulemds` calling the `get_buildrequired_modules`
and returning modulemd metadata.
This also removes the outdated comments around authorship of each
file. If there is still interest in this information, one can just
look at the git history.
Before this commit, the base modules used in the `get_reusable_module` have
not been sorted and therefore when `get_reusable_module` tried to find out
the reusable module built against some base module, it could find a module
built against some old version of base module.
This could lead to situation when MBS tried to reuse components from quite
old module despite the fact that newer module build existed.
This commit fixes this by sorting the base modules by stream_version,
so MBS always tries to get the reusable module built against the latest
base module.
The issue is that users don't get feedback from MBS about why a
component was not reused. There was added logic which enables to
store log messages in the database and can be viewed through the
REST api of MBS.
Ticket-ID: #1284
Signed-off-by: Martin Curlej <mcurlej@redhat.com>
This patch separates the use of database session in different MBS components
and do not mix them together.
In general, MBS components could be separated as the REST API (implemented
based on Flask) and non-REST API including the backend build workflow
(implemented as a fedmsg consumer on top of fedmsg-hub and running
independently) and library shared by them. As a result, there are two kind of
database session used in MBS, one is created and managed by Flask-SQLAlchemy,
and another one is created from SQLAclhemy Session API directly. The goal of
this patch is to make ensure session object is used properly in the right
place.
All the changes follow these rules:
* REST API related code uses the session object db.session created and
managed by Flask-SQLAlchemy.
* Non-REST API related code uses the session object created with SQLAlchemy
Session API. Function make_db_session does that.
* Shared code does not created a new session object as much as possible.
Instead, it accepts an argument db_session.
The first two rules are applicable to tests as well.
Major changes:
* Switch tests back to run with a file-based SQLite database.
* make_session is renamed to make_db_session and SQLAlchemy connection pool
options are applied for PostgreSQL backend.
* Frontend Flask related code uses db.session
* Shared code by REST API and backend build workflow accepts SQLAlchemy session
object as an argument. For example, resolver class is constructed with a
database session, and some functions accepts an argument for database session.
* Build workflow related code use session object returned from make_db_session
and ensure db.session is not used.
* Only tests for views use db.session, and other tests use db_session fixture
to access database.
* All argument name session, that is for database access, are renamed to
db_session.
* Functions model_tests_init_data, reuse_component_init_data and
reuse_shared_userspace_init_data, which creates fixture data for
tests, are converted into pytest fixtures from original function
called inside setup_method or a test method. The reason of this
conversion is to use fixture ``db_session`` rather than create a
new one. That would also benefit the whole test suite to reduce the
number of SQLAlchemy session objects.
Signed-off-by: Chenxiong Qi <cqi@redhat.com>
There was a race condition, when 2 builds where build in the same time.
There was an issue that after one has finished the other reused the new build
for reuse and not the one it started with.
Ticket-ID: FACTORY-3862
Signed-off-by: Martin Curlej <mcurlej@redhat.com>
This also moves the methods load_mmd and load_mmd_file to
module_build_service.utils.general.
This also removes some MSE unit tests with a mix of positive and
negative streams since this is not supported in libmodulemd v2. The
user will be presented with a syntax error if they try to submit
such a modulemd file.
- Keep scratch module builds in the 'done' state.
- Make koji tagging for scratch modules unique so the same
commit can be resubmitted.
- Use alternate prefix for scratch module build components so they can
be identified later.
- Prevent scratch build components from being reused.
- Assorted code and comment cleanup.
Signed-off-by: Merlin Mathesius <mmathesi@redhat.com>
If a module has filters set and it buildrequires itself, issues occur
during component reuse. In that event, the filtered RPMs from the
previous module build will not be available in the buildroot because the NVRs
in the filters will match the RPMs from the reused component.
Co-authored-by: Jan Kaluza <jkaluza@redhat.com>
The name from the NVR and the name from the component may be different based on
the macros being used as part of the build. SCLs are a great example of this.
