Remove MySQL integration and dedicated code (#7814)

* Remove MySQL integration and dedicated code

* Nit

* Clean up a few more files

* Fix linting

* Propagate DATABASE_URL in other containers

.circleci/config.yml

@@ -49,24 +49,6 @@ jobs:
           command: tox -e linters
           name: Run linters
 
-  python-tests-mysql:
-    machine:
-      image: default
-    steps:
-      - checkout
-      - docker/install-docker-compose:
-          version: 1.29.2
-      - run:
-          command: sudo apt-get update && sudo apt-get install python3-venv -y
-          name: python for glean
-      - run:
-          name: Run tests and coverage within Docker container
-          command: |
-            pip install --upgrade pip
-            pip install tox
-            tox -e docker
-      - codecov/upload
-
   python-tests-postgres:
     machine:
       image: default
@@ -158,7 +140,6 @@ workflows:
     jobs:
       - javascript-tests
       - builds
-      - python-tests-mysql
       - python-tests-postgres
       - test-docker-build
       - deploy:

docker-compose.yml

@@ -15,7 +15,7 @@ services:
       # Development/CI-specific environment variables only.
       # Those that do not vary across environments should go in `Dockerfile`.
       - BROKER_URL=amqp://guest:guest@rabbitmq//
-      - DATABASE_URL=${DATABASE_URL:-mysql://root@mysql/treeherder}
+      - DATABASE_URL=${DATABASE_URL:-psql://postgres:mozilla1234@postgres:5432/treeherder}
       - GITHUB_TOKEN=${GITHUB_TOKEN:-}
       - UPSTREAM_DATABASE_URL=${UPSTREAM_DATABASE_URL:-}
       - PERF_SHERIFF_BOT_CLIENT_ID=${PERF_SHERIFF_BOT_CLIENT_ID:-}
@@ -43,7 +43,6 @@ services:
     ports:
       - '8000:8000'
     depends_on:
-      - mysql
       - redis
       - postgres
       - rabbitmq
@@ -68,22 +67,6 @@ services:
       - '5000:5000'
     platform: linux/amd64
 
-  mysql:
-    container_name: mysql
-    # https://hub.docker.com/r/library/mysql/
-    image: mysql:5.7.44
-    platform: linux/amd64
-    environment:
-      - MYSQL_ALLOW_EMPTY_PASSWORD=true
-      - MYSQL_DATABASE=treeherder
-      - LANG=C.UTF_8
-    volumes:
-      - ./docker/mysql.cnf:/etc/mysql/conf.d/mysql.cnf
-      - mysql_data:/var/lib/mysql
-    ports:
-      - '3306:3306'
-    command: --character-set-server=utf8 --collation-server=utf8_bin
-
   postgres:
     container_name: postgres
     # https://hub.docker.com/r/library/postgres/
@@ -126,7 +109,7 @@ services:
       - PULSE_URL=${PULSE_URL:-}
       - LOGGING_LEVEL=INFO
       - PULSE_AUTO_DELETE_QUEUES=True
-      - DATABASE_URL=mysql://root@mysql:3306/treeherder
+      - DATABASE_URL=${DATABASE_URL:-psql://postgres:mozilla1234@postgres:5432/treeherder}
       - BROKER_URL=amqp://guest:guest@rabbitmq//
       - SKIP_INGESTION=${SKIP_INGESTION:-False}
     entrypoint: './docker/entrypoint.sh'
@@ -134,7 +117,6 @@ services:
     volumes:
       - .:/app
     depends_on:
-      - mysql
       - postgres
       - rabbitmq
     platform: linux/amd64
@@ -145,14 +127,13 @@ services:
       dockerfile: docker/dev.Dockerfile
     environment:
       - BROKER_URL=amqp://guest:guest@rabbitmq:5672//
-      - DATABASE_URL=mysql://root@mysql:3306/treeherder
+      - DATABASE_URL=${DATABASE_URL:-psql://postgres:mozilla1234@postgres:5432/treeherder}
       - PROJECTS_TO_INGEST=${PROJECTS_TO_INGEST:-autoland,try}
     entrypoint: './docker/entrypoint.sh'
     command: celery -A treeherder worker --uid=nobody --gid=nogroup --without-gossip --without-mingle --without-heartbeat -Q store_pulse_pushes,store_pulse_tasks,store_pulse_tasks_classification,statsd --concurrency=1 --loglevel=INFO
     volumes:
       - .:/app
     depends_on:
-      - mysql
       - postgres
       - redis
       - rabbitmq
@@ -168,5 +149,4 @@ services:
 
 volumes:
   # TODO: Experiment with using tmpfs when testing, to speed up database-using Python tests.
-  mysql_data: {}
   postgres_data: {}

docker/Dockerfile

@@ -17,12 +17,6 @@ RUN yarn build
 ## Backend stage
 FROM python:3.9.19-slim-bullseye
 
-# libmysqlclient-dev is required for the mysqlclient Python package.
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    pkg-config \
-    default-libmysqlclient-dev \
-    && rm -rf /var/lib/apt/lists/*
-
 WORKDIR /app
 
 COPY requirements/ /app/requirements/

docker/dev.Dockerfile

@@ -3,12 +3,8 @@ FROM python:3.9.19-bullseye
 # Variables that are not specific to a particular environment.
 ENV NEW_RELIC_CONFIG_FILE newrelic.ini
 
-# libmysqlclient-dev and gcc are required for the mysqlclient Python package.
-# netcat is used for the MySQL readiness check in entrypoint.sh.
+# netcat is used for the Postgres readiness check in entrypoint.sh.
 RUN apt-get update && apt-get install -y --no-install-recommends \
-    pkg-config \
-    default-libmysqlclient-dev \
-    gcc \
     netcat \
     && rm -rf /var/lib/apt/lists/*
 

docker/entrypoint.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 # This file is the entrypoint for the backend container.
-# It takes care of making sure to wait for the mysql and rabbitmq containers to be ready
+# It takes care of making sure to wait for the postgres and rabbitmq containers to be ready
 
 # Make non-zero exit codes & other errors fatal.
 set -euo pipefail
@@ -18,9 +18,6 @@ function check_service () {
 
 # Keep these in sync with DATABASE_URL.
 echo "Checking database status at $DATABASE_URL"
-if [[ ${DATABASE_URL:0:8} == "mysql://" ]]; then
-  check_service "MySQL" "mysql" 3306;
-fi
 if [[ ${DATABASE_URL:0:7} == "psql://" ]]; then
   check_service "PostgreSQL" "postgres" 5432;
 fi

docker/mysql.cnf

@@ -1,28 +0,0 @@
-# Overrides the mysql defaults in /etc/mysql/my.cnf
-# Any changes here will require restarting docker-compose to take effect.
-# NB: This file is only used by docker-compose, and must be kept in sync with
-# the RDS parameter group used by stage/prod:
-# https://github.com/mozilla-platform-ops/devservices-aws/blob/master/treeherder/rds.tf
-
-[mysqld]
-character_set_server="utf8"
-collation_server="utf8_bin"
-max_connections=1000
-
-# Ensure operations involving astral characters fail loudly,
-# rather than mysql silently replacing each each byte of the
-# original character with a U+FFFD replacement character.
-# See bug 1275425.
-sql_mode="NO_ENGINE_SUBSTITUTION,STRICT_ALL_TABLES"
-
-# Django advises using READ-COMMITTED instead of REPEATABLE-READ:
-# https://docs.djangoproject.com/en/1.10/ref/models/querysets/#get-or-create
-# Unhelpfully MySQL uses a different (undocumented) variable name if set via config file:
-# https://bugs.mysql.com/bug.php?id=70008
-transaction-isolation=READ-COMMITTED
-
-# Development/CI only: Speed up I/O by reducing data-loss protection.
-innodb_flush_log_at_trx_commit="0"
-
-# Development/CI only: Reduce verbosity of log output (output errors only).
-log_error_verbosity="1"

docs/backend_tasks.md

@@ -60,29 +60,29 @@ toolbar to your right.
 
 ## Connecting to Services Running inside Docker
 
-Treeherder uses various services to function, eg MySQL, etc.
+Treeherder uses various services to function, eg Postgres, etc.
 At times it can be useful to connect to them from outside the Docker environment.
 
 The `docker-compose.yml` file defines how internal ports are mapped to the host OS' ports.
 
-In the below example we're mapping the container's port 3306 (MySQL's default port) to host port 3306.
+In the below example we're mapping the container's port 5432 (Postgres's default port) to host port 5432.
 
 ```yaml
 # This is a line from the docker-compose.yml file
 ports:
-  - '3306:3306'
+  - '5432:5432'
 ```
 
 <!-- prettier-ignore -->
 !!! note
     Any forwarded ports will block usage of that port on the host OS even if there isn't a service running inside the VM talking to it.
 
-With MySQL exposed at port 3306 you can connect to it from your host OS with the following credentials:
+With Postgres exposed at port 5432 you can connect to it from your host OS with the following credentials:
 
 - host: `localhost`
-- port: `3306`
-- user: `root`
-- password: leave blank
+- port: `5432`
+- user: `postgres`
+- password: `mozilla1234`
 
 Other services running inside the Compose project, can be accessed in the same way.
 

docs/infrastructure/troubleshooting.md

@@ -25,7 +25,7 @@ For less urgent issues or general support, you can file a bug with [cloudOps](ht
     [prototype](https://rpm.newrelic.com/accounts/677903/applications/7385291/transactions?type=other&show_browser=false) |
     [stage](https://rpm.newrelic.com/accounts/677903/applications/14179733/transactions?type=other&show_browser=false) |
     [prod](https://rpm.newrelic.com/accounts/677903/applications/14179757/transactions?type=other&show_browser=false)
-  - MySQL/Redis client request stats:
+  - Postgres/Redis client request stats:
     [prototype](https://rpm.newrelic.com/accounts/677903/applications/7385291/datastores) |
     [stage](https://rpm.newrelic.com/accounts/677903/applications/14179733/datastores) |
     [prod](https://rpm.newrelic.com/accounts/677903/applications/14179757/datastores)

docs/installation.md

@@ -117,14 +117,14 @@ is what needs to be set. You can do this in a file in the root of `/treeherder`
 `.env`:
 
 ```bash
-DATABASE_URL=mysql://user:password@hostname/treeherder
+DATABASE_URL=psql://user:password@hostname/treeherder
 ```
 
 Alternatively, you can `export` that value in your terminal prior to executing
 `docker-compose up` or just specify it on the command line as you execute:
 
 ```bash
-DATABASE_URL=mysql://user:password@hostname/treeherder SKIP_INGESTION=True docker-compose up
+DATABASE_URL=psql://user:password@hostname/treeherder SKIP_INGESTION=True docker-compose up
 ```
 
 <!-- prettier-ignore -->
@@ -134,14 +134,14 @@ DATABASE_URL=mysql://user:password@hostname/treeherder SKIP_INGESTION=True docke
     even if `DATABASE_URL` is set.  But it will use your system's resources unnecessarily.
     To skip data ingestion, set the var `SKIP_INGESTION=True`
 
-### Deleting the MySql database
+### Deleting the Postgres database
 
-The MySql database is kept locally and is not destroyed when the Docker containers are destroyed.
+The Postgres database is kept locally and is not destroyed when the Docker containers are destroyed.
 If you want to start from scratch type the following commands:
 
 ```bash
 docker-compose down
-docker volume rm treeherder_mysql_data
+docker volume rm treeherder_postgres_data
 ```
 
 ### Running the ingestion tasks

initialize_data.sh

@@ -2,10 +2,10 @@
 # Make non-zero exit codes & other errors fatal.
 set -euo pipefail
 
-export DATABASE_URL=${DATABASE_URL:-mysql://root@127.0.0.1:3306/treeherder}
-# Only execute if we're using the Mysql container
-if [ "${DATABASE_URL}" == "mysql://root@mysql/treeherder" ] ||
-   [ "${DATABASE_URL}" == "mysql://root@127.0.0.1:3306/treeherder" ]; then
+export DATABASE_URL=${DATABASE_URL:-psql://postgres:mozilla1234@127.0.0.1:5432/treeherder}
+# Only execute if we're using the Postgres container
+if [ "${DATABASE_URL}" == "psql://postgres:mozilla1234@postgres:5432/treeherder" ] ||
+   [ "${DATABASE_URL}" == "psql://postgres:mozilla1234@127.0.0.1:5432/treeherder" ]; then
     # Initialize migrations
     echo '-----> Running Django migrations and loading reference data'
     ./manage.py migrate --noinput

requirements/common.in

@@ -8,7 +8,6 @@ simplejson==3.19.2  # import simplejson
 newrelic==9.10.0
 certifi==2024.2.2
 
-mysqlclient==2.2.4   # Required by Django
 psycopg2-binary==2.9.9
 
 jsonschema==4.22.0  # import jsonschema

tests/README.md

@@ -7,13 +7,13 @@ The backend test suite can be run outside the Docker container.
 We need all but the main `backend` service running.  Since multiple `backend` instances are allowed, we will simply start everything up
 
     # ENSURE THE IMAGES ARE CLEAN
-    docker rm "/mysql"
+    docker rm "/postgres"
     docker rm "/frontend"
     docker rm "/rabbitmq" 
     docker rm "/redis"
     docker rm "/backend"
     docker-compose down
-    docker volume rm treeherder_mysql_data 
+    docker volume rm treeherder_postgres_data 
     
     # SETUP ALL IMAGES
     docker-compose up --build
@@ -42,7 +42,6 @@ Be sure you are in the `treeherder` main directory
 
     python -m venv .venv             # IMPORTANT: Notice the dot in the name
     source .venv/bin/activate
-    export LDFLAGS=-L/usr/local/opt/openssl/lib   # https://github.com/PyMySQL/mysqlclient-python/issues/131#issuecomment-503644579
     pip install --no-deps -r requirements/dev.txt
     pip install --no-deps -r requirements/common.txt
 
@@ -56,7 +55,7 @@ For Windows, Treeherder requires a number of environment variables that point to
 
 If you plan to use an IDE, here is the same, as a very long line
 
-    BROKER_URL=localhost//guest:guest@rabbitmq//;DATABASE_URL=mysql://root@localhost:3306/treeherder;REDIS_URL=redis://localhost:6379;SITE_URL=http://backend:8000/;TREEHERDER_DEBUG=True;TREEHERDER_DJANGO_SECRET_KEY=secret-key-of-at-least-50-characters-to-pass-check-deploy;NEW_RELIC_DEVELOPER_MODE=True
+    BROKER_URL=localhost//guest:guest@rabbitmq//;DATABASE_URL=psql://postgres:mozilla1234@postgres:5432/treeherder;REDIS_URL=redis://localhost:6379;SITE_URL=http://backend:8000/;TREEHERDER_DEBUG=True;TREEHERDER_DJANGO_SECRET_KEY=secret-key-of-at-least-50-characters-to-pass-check-deploy;NEW_RELIC_DEVELOPER_MODE=True
 
 ## Ensure everything is working
 

tests/env.bat

@@ -1,5 +1,5 @@
 SET BROKER_URL=localhost//guest:guest@rabbitmq//
-SET DATABASE_URL=mysql://root@localhost:3306/treeherder
+SET DATABASE_URL=psql://postgres:mozilla1234@postgres:5432/treeherder
 SET REDIS_URL=redis://localhost:6379
 SET SITE_URL=http://backend:8000/
 SET TREEHERDER_DEBUG=True

tests/log_parser/test_store_failure_lines.py

@@ -99,23 +99,12 @@ def test_store_error_summary_astral(activate_responses, test_repository, test_jo
 
     assert failure.repository == test_repository
 
-    # Specific unicode chars cannot be inserted as MySQL pseudo-UTF8 and are replaced by a plain text representation
-    if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-        assert (
-            failure.test
-            == "toolkit/content/tests/widgets/test_videocontrols_video_direction.html <U+01F346>"
-        )
-        assert failure.subtest == "Test timed out. <U+010081>"
-        assert failure.message == "<U+0F0151>"
-        assert failure.stack.endswith("<U+0F0151>")
-    else:
-        assert (
-            failure.test
-            == "toolkit/content/tests/widgets/test_videocontrols_video_direction.html 🍆"
-        )
-        assert failure.subtest == "Test timed out. 𐂁"
-        assert failure.message == "󰅑"
-        assert failure.stack.endswith("󰅑")
+    assert (
+        failure.test == "toolkit/content/tests/widgets/test_videocontrols_video_direction.html 🍆"
+    )
+    assert failure.subtest == "Test timed out. 𐂁"
+    assert failure.message == "󰅑"
+    assert failure.stack.endswith("󰅑")
     assert failure.stackwalk_stdout is None
     assert failure.stackwalk_stderr is None
 

tests/model/cycle_data/test_perfherder_cycling.py

@@ -4,7 +4,6 @@ from unittest.mock import MagicMock
 from unittest.mock import patch
 
 import pytest
-from django.conf import settings
 from django.core.management import call_command
 from django.db import connection, IntegrityError
 
@@ -810,16 +809,7 @@ def test_deleting_performance_data_cascades_to_perf_multicomit_data(test_perf_da
 
     try:
         cursor = connection.cursor()
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            cursor.execute(
-                """
-                DELETE FROM `performance_datum`
-                WHERE id = %s
-                """,
-                [perf_datum.id],
-            )
-        else:
-            PerformanceDatum.objects.filter(id=perf_datum.id).delete()
+        PerformanceDatum.objects.filter(id=perf_datum.id).delete()
     except IntegrityError:
         pytest.fail()
     finally:

tests/model/test_bugscache.py

@@ -141,31 +141,6 @@ def test_bug_properties(transactional_db, sample_bugs):
     assert set(suggestions["open_recent"][0].keys()) == expected_keys
 
 
-SEARCH_TERMS = (
-    ("(test_popup_preventdefault_chrome.xul+)", " test_popup_preventdefault_chrome.xul  "),
-    (
-        "TEST-UNEXPECTED-TIMEOUT | /webrtc/promises-call.html | Can set up a basic WebRTC call with only data using promises. - Test timed out",
-        "TEST UNEXPECTED TIMEOUT | /webrtc/promises call.html | Can set up a basic WebRTC call with only data using promises.   Test timed out",
-    ),
-    (
-        "*command timed out: 3600 seconds without output running~",
-        " command timed out: 3600 seconds without output running ",
-    ),
-    (
-        '"input password unmask.html#abc_def 0 7 7 7"',
-        " input password unmask.html#abc_def 0 7 7 7 ",
-    ),
-)
-
-
-def test_sanitized_search_term():
-    """Test that search terms are properly sanitized (this method is called in Bugscache.search before executing queries)."""
-
-    for case in SEARCH_TERMS:
-        sanitized_term = Bugscache.sanitized_search_term(case[0])
-        assert sanitized_term == case[1]
-
-
 @pytest.mark.django_db(transaction=True)
 def test_import(mock_bugscache_bugzilla_request):
     """

tox.ini

@@ -10,7 +10,7 @@ allowlist_externals =
     sh
     docker-compose
 commands_pre =
-    docker-compose up --detach mysql postgres redis rabbitmq
+    docker-compose up --detach postgres redis rabbitmq
     pip install --no-deps -r {toxinidir}/requirements/dev.txt
     pip install --no-deps -r {toxinidir}/requirements/common.txt
 commands =
@@ -41,16 +41,12 @@ commands =
     mkdocs build
 commands_post =
 
-[testenv:docker]
+[testenv:docker-postgres]
 commands_pre =
 allowlist_externals=
     docker-compose
 commands =
     docker-compose run -e TREEHERDER_DEBUG=False backend bash -c "pytest --cov --cov-report=xml tests/ --runslow -p no:unraisableexception"
 
-[testenv:docker-postgres]
-commands_pre =
-allowlist_externals=
-    docker-compose
-commands =
-    docker-compose run -e TREEHERDER_DEBUG=False -e DATABASE_URL=psql://postgres:mozilla1234@postgres:5432/treeherder backend bash -c "pytest --cov --cov-report=xml tests/ --runslow -p no:unraisableexception"
+[flake8]
+per-file-ignores = treeherder/model/models.py:E402

treeherder/config/settings.py

@@ -125,14 +125,14 @@ MIDDLEWARE = [
 # Database
 # The database config is defined using environment variables of form:
 #
-#   'mysql://username:password@host:optional_port/database_name'
+#   'psql://username:password@host:optional_port/database_name'
 #
 # which django-environ converts into the Django DB settings dict format.
-LOCALHOST_MYSQL_HOST = "mysql://root@{}:3306/treeherder".format(
+LOCALHOST_PSQL_HOST = "psql://postgres:mozilla1234@{}:5432/treeherder".format(
     "localhost" if IS_WINDOWS else "127.0.0.1"
 )
 DATABASES = {
-    "default": env.db_url("DATABASE_URL", default=LOCALHOST_MYSQL_HOST),
+    "default": env.db_url("DATABASE_URL", default=LOCALHOST_PSQL_HOST),
 }
 
 # Only used when syncing local database with production replicas
@@ -147,27 +147,6 @@ for alias, db in DATABASES.items():
     # Persist database connections for 5 minutes, to avoid expensive reconnects.
     db["CONN_MAX_AGE"] = 300
 
-    # These options are only valid for mysql
-    if db["ENGINE"] != "django.db.backends.mysql":
-        continue
-
-    db["OPTIONS"] = {
-        # Override Django's default connection charset of 'utf8', otherwise it's
-        # still not possible to insert non-BMP unicode into utf8mb4 tables.
-        "charset": "utf8mb4",
-        # From MySQL 5.7 onwards and on fresh installs of MySQL 5.6, the default value of the sql_mode
-        # option contains STRICT_TRANS_TABLES. That option escalates warnings into errors when data are
-        # truncated upon insertion, so Django highly recommends activating a strict mode for MySQL to
-        # prevent data loss (either STRICT_TRANS_TABLES or STRICT_ALL_TABLES).
-        "init_command": "SET sql_mode='STRICT_TRANS_TABLES'",
-    }
-    # For use of the stage replica, use the 'deployment/gcp/ca-cert.pem' path for use in your local env file
-    # or pass the variable to docker-compose command; additional certs are in the deployment directory.
-    if connection_should_use_tls(db["HOST"]):
-        db["OPTIONS"]["ssl"] = {
-            "ca": env("TLS_CERT_PATH", default=None),
-        }
-
 # Since Django 3.2, the default AutoField must be configured
 DEFAULT_AUTO_FIELD = "django.db.models.AutoField"
 

treeherder/config/utils.py

@@ -4,4 +4,4 @@ from furl import furl
 def connection_should_use_tls(url):
     # Ensure use of celery workers for local development
     host = furl(url).host or url  # The url passed is already just the hostname.
-    return host not in ("127.0.0.1", "localhost", "mysql", "rabbitmq")
+    return host not in ("127.0.0.1", "localhost", "postgres", "rabbitmq")

treeherder/model/data_cycling/removal_strategies.py

@@ -5,7 +5,6 @@ from abc import ABC, abstractmethod
 from datetime import timedelta, datetime
 from itertools import cycle
 
-from django.conf import settings
 from django.db.backends.utils import CursorWrapper
 
 from treeherder.model.models import Repository
@@ -80,29 +79,12 @@ class MainRemovalStrategy(RemovalStrategy):
 
     def remove(self, using: CursorWrapper):
         chunk_size = self._find_ideal_chunk_size()
-
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            # Django's queryset API doesn't support MySQL's
-            # DELETE statements with LIMIT constructs,
-            # even though this database is capable of doing that.
-            #
-            # If ever this support is added in Django, replace
-            # raw SQL bellow with equivalent queryset commands.
-            using.execute(
-                """
-                DELETE FROM `performance_datum`
-                WHERE push_timestamp <= %s
-                LIMIT %s
-            """,
-                [self._max_timestamp, chunk_size],
-            )
-        else:
-            deleted, _ = PerformanceDatum.objects.filter(
-                id__in=PerformanceDatum.objects.filter(
-                    push_timestamp__lte=self._max_timestamp
-                ).values_list("id")[:chunk_size]
-            ).delete()
-            using.rowcount = deleted
+        deleted, _ = PerformanceDatum.objects.filter(
+            id__in=PerformanceDatum.objects.filter(
+                push_timestamp__lte=self._max_timestamp
+            ).values_list("id")[:chunk_size]
+        ).delete()
+        using.rowcount = deleted
 
     @property
     def name(self) -> str:
@@ -192,35 +174,14 @@ class TryDataRemoval(RemovalStrategy):
         return "try data removal strategy"
 
     def __attempt_remove(self, using):
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            # Django's queryset API doesn't support MySQL's
-            # DELETE statements with LIMIT constructs,
-            # even though this database is capable of doing that.
-            #
-            # If ever this support is added in Django, replace
-            # raw SQL bellow with equivalent queryset commands.
-            total_signatures = len(self.target_signatures)
-            from_target_signatures = " OR ".join(["signature_id =  %s"] * total_signatures)
-
-            delete_try_data = f"""
-                DELETE FROM `performance_datum`
-                WHERE repository_id = %s AND push_timestamp <= %s AND ({from_target_signatures})
-                LIMIT %s
-            """
-
-            using.execute(
-                delete_try_data,
-                [self.try_repo, self._max_timestamp, *self.target_signatures, self._chunk_size],
-            )
-        else:
-            deleted, _ = PerformanceDatum.objects.filter(
-                id__in=PerformanceDatum.objects.filter(
-                    repository_id=self.try_repo,
-                    push_timestamp__lte=self._max_timestamp,
-                    signature_id__in=self.target_signatures,
-                ).values_list("id")[: self._chunk_size]
-            ).delete()
-            using.rowcount = deleted
+        deleted, _ = PerformanceDatum.objects.filter(
+            id__in=PerformanceDatum.objects.filter(
+                repository_id=self.try_repo,
+                push_timestamp__lte=self._max_timestamp,
+                signature_id__in=self.target_signatures,
+            ).values_list("id")[: self._chunk_size]
+        ).delete()
+        using.rowcount = deleted
 
     def __lookup_new_signature(self):
         self.__target_signatures = self.__try_signatures[: self.SIGNATURE_BULK_SIZE]
@@ -284,33 +245,12 @@ class IrrelevantDataRemoval(RemovalStrategy):
 
     def remove(self, using: CursorWrapper):
         chunk_size = self._find_ideal_chunk_size()
-
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            # Django's queryset API doesn't support MySQL's
-            # DELETE statements with LIMIT constructs,
-            # even though this database is capable of doing that.
-            #
-            # If ever this support is added in Django, replace
-            # raw SQL bellow with equivalent queryset commands.
-            using.execute(
-                """
-                    DELETE FROM `performance_datum`
-                    WHERE repository_id = %s AND push_timestamp <= %s
-                    LIMIT %s
-                """,
-                [
-                    self.irrelevant_repo,
-                    self._max_timestamp,
-                    chunk_size,
-                ],
-            )
-        else:
-            deleted, _ = PerformanceDatum.objects.filter(
-                id__in=PerformanceDatum.objects.filter(
-                    repository_id=self.irrelevant_repo, push_timestamp__lte=self._max_timestamp
-                ).values_list("id")[:chunk_size]
-            ).delete()
-            using.rowcount = deleted
+        deleted, _ = PerformanceDatum.objects.filter(
+            id__in=PerformanceDatum.objects.filter(
+                repository_id=self.irrelevant_repo, push_timestamp__lte=self._max_timestamp
+            ).values_list("id")[:chunk_size]
+        ).delete()
+        using.rowcount = deleted
 
     def _find_ideal_chunk_size(self) -> int:
         max_id_of_non_expired_row = (
@@ -402,35 +342,14 @@ class StalledDataRemoval(RemovalStrategy):
         return "stalled data removal strategy"
 
     def __attempt_remove(self, using: CursorWrapper):
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            # Django's queryset API doesn't support MySQL's
-            # DELETE statements with LIMIT constructs,
-            # even though this database is capable of doing that.
-            #
-            # If ever this support is added in Django, replace
-            # raw SQL bellow with equivalent queryset commands.
-            using.execute(
-                """
-                    DELETE FROM `performance_datum`
-                    WHERE repository_id = %s AND signature_id = %s AND push_timestamp <= %s
-                    LIMIT %s
-                """,
-                [
-                    self.target_signature.repository_id,
-                    self.target_signature.id,
-                    self._max_timestamp,
-                    self._chunk_size,
-                ],
-            )
-        else:
-            deleted, _ = PerformanceDatum.objects.filter(
-                id__in=PerformanceDatum.objects.filter(
-                    repository_id=self.target_signature.repository_id,
-                    signature_id=self.target_signature.id,
-                    push_timestamp__lte=self._max_timestamp,
-                ).values_list("id")[: self._chunk_size]
-            ).delete()
-            using.rowcount = deleted
+        deleted, _ = PerformanceDatum.objects.filter(
+            id__in=PerformanceDatum.objects.filter(
+                repository_id=self.target_signature.repository_id,
+                signature_id=self.target_signature.id,
+                push_timestamp__lte=self._max_timestamp,
+            ).values_list("id")[: self._chunk_size]
+        ).delete()
+        using.rowcount = deleted
 
     def __lookup_new_signature(self):
         try:

treeherder/model/error_summary.py

@@ -220,7 +220,7 @@ def get_error_search_term_and_path(error_line):
     Generate a search term from the given error_line string.
 
     Attempt to build a search term that will yield meaningful results when used
-    in a MySQL FTS query.
+    in a FTS query.
     """
     if not error_line:
         return None

treeherder/model/migrations/0001_squashed_0022_modify_bugscache_and_bugjobmap.py

@@ -6,72 +6,6 @@ from django.conf import settings
 from django.db import migrations, models
 
 
-if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.mysql':
-    EXTRA_MIGRATIONS = [
-        # Manually created migrations.
-        # Since Django doesn't natively support creating FULLTEXT indices.
-        migrations.RunSQL(
-            [
-                # Suppress the MySQL warning "InnoDB rebuilding table to add column FTS_DOC_ID":
-                # https://dev.mysql.com/doc/refman/5.7/en/innodb-fulltext-index.html#innodb-fulltext-index-docid
-                # The table is empty when the index is added, so we don't care about it being rebuilt,
-                # and there isn't a better way to add the index without Django FULLTEXT support.
-                'SET @old_max_error_count=@@max_error_count, max_error_count=0;',
-                'CREATE FULLTEXT INDEX idx_summary ON bugscache (summary);',
-                'SET max_error_count=@old_max_error_count;',
-            ],
-            reverse_sql=['ALTER TABLE bugscache DROP INDEX idx_summary;'],
-            state_operations=[
-                migrations.AddIndex(
-                    model_name='bugscache',
-                    index=models.Index(fields=['summary'], name='bugscache_summary_7f6b96_idx'),
-                )
-            ],
-        ),
-        # Since Django doesn't natively support creating composite prefix indicies for Mysql
-        migrations.RunSQL(
-            [
-                'CREATE INDEX failure_line_test_idx ON failure_line (test(50), subtest(25), status, expected, created);',
-                'CREATE INDEX failure_line_signature_test_idx ON failure_line (signature(25), test(50), created);',
-            ],
-            reverse_sql=[
-                'DROP INDEX failure_line_test_idx ON failure_line;',
-                'DROP INDEX failure_line_signature_test_idx ON failure_line;',
-            ],
-            state_operations=[
-                migrations.AlterIndexTogether(
-                    name='failureline',
-                    index_together=set(
-                        [
-                            ('test', 'subtest', 'status', 'expected', 'created'),
-                            ('job_guid', 'repository'),
-                            ('signature', 'test', 'created'),
-                        ]
-                    ),
-                ),
-            ],
-        ),
-    ]
-else:
-    # On postgres we can use standard migrations
-    EXTRA_MIGRATIONS = [
-        migrations.AlterIndexTogether(
-            name='failureline',
-            index_together=set(
-                [
-                    ('test', 'subtest', 'status', 'expected', 'created'),
-                    ('job_guid', 'repository'),
-                    ('signature', 'test', 'created'),
-                ]
-            ),
-        ),
-        migrations.AddIndex(
-            model_name='bugscache',
-            index=models.Index(fields=['summary'], name='bugscache_summary_7f6b96_idx'),
-        ),
-    ]
-
-
 class Migration(migrations.Migration):
     initial = True
 
@@ -1030,4 +964,18 @@ class Migration(migrations.Migration):
             name='bugjobmap',
             unique_together=set([('job', 'bug_id')]),
         ),
-    ] + EXTRA_MIGRATIONS
+        migrations.AlterIndexTogether(
+            name='failureline',
+            index_together=set(
+                [
+                    ('test', 'subtest', 'status', 'expected', 'created'),
+                    ('job_guid', 'repository'),
+                    ('signature', 'test', 'created'),
+                ]
+            ),
+        ),
+        migrations.AddIndex(
+            model_name='bugscache',
+            index=models.Index(fields=['summary'], name='bugscache_summary_7f6b96_idx'),
+        ),
+    ]

treeherder/model/models.py

@@ -1,7 +1,6 @@
 import datetime
 import itertools
 import logging
-import re
 import time
 from hashlib import sha1
 
@@ -10,7 +9,6 @@ import warnings
 warnings.filterwarnings("ignore", category=DeprecationWarning, module="newrelic")
 
 import newrelic.agent
-from django.conf import settings
 from django.contrib.auth.models import User
 from django.core.cache import cache
 from django.core.exceptions import ObjectDoesNotExist
@@ -233,58 +231,20 @@ class Bugscache(models.Model):
     def __str__(self):
         return f"{self.id}"
 
-    @classmethod
-    def sanitized_search_term(cls, search_term):
-        # MySQL Full Text Search operators, based on:
-        # https://dev.mysql.com/doc/refman/5.7/en/fulltext-boolean.html
-        # and other characters we want to remove
-        mysql_fts_operators_re = re.compile(r'[-+@<>()~*"\\]')
-
-        # Replace MySQL's Full Text Search Operators with spaces so searching
-        # for errors that have been pasted in still works.
-        return re.sub(mysql_fts_operators_re, " ", search_term)
-
     @classmethod
     def search(cls, search_term):
         max_size = 50
 
-        if settings.DATABASES["default"]["ENGINE"] == "django.db.backends.mysql":
-            # Do not wrap a string in quotes to search as a phrase;
-            # see https://bugzilla.mozilla.org/show_bug.cgi?id=1704311
-            search_term_fulltext = cls.sanitized_search_term(search_term)
-
-            # Substitute escape and wildcard characters, so the search term is used
-            # literally in the LIKE statement.
-            search_term_like = (
-                search_term.replace("=", "==")
-                .replace("%", "=%")
-                .replace("_", "=_")
-                .replace('\\"', "")
-            )
-
-            recent_qs = cls.objects.raw(
-                """
-                SELECT id, summary, crash_signature, keywords, resolution, status, dupe_of,
-                 MATCH (`summary`) AGAINST (%s IN BOOLEAN MODE) AS relevance
-                  FROM bugscache
-                 WHERE 1
-                   AND `summary` LIKE CONCAT ('%%%%', %s, '%%%%') ESCAPE '='
-              ORDER BY relevance DESC
-                 LIMIT 0,%s
-                """,
-                [search_term_fulltext, search_term_like, max_size],
-            )
-        else:
-            # On PostgreSQL we can use the ORM directly, but NOT the full text search
-            # as the ranking algorithm expects english words, not paths
-            # So we use standard pattern matching AND trigram similarity to compare suite of characters
-            # instead of words
-            # Django already escapes special characters, so we do not need to handle that here
-            recent_qs = (
-                Bugscache.objects.filter(summary__icontains=search_term)
-                .annotate(similarity=TrigramSimilarity("summary", search_term))
-                .order_by("-similarity")[0:max_size]
-            )
+        # On PostgreSQL we can use the ORM directly, but NOT the full text search
+        # as the ranking algorithm expects english words, not paths
+        # So we use standard pattern matching AND trigram similarity to compare suite of characters
+        # instead of words
+        # Django already escapes special characters, so we do not need to handle that here
+        recent_qs = (
+            Bugscache.objects.filter(summary__icontains=search_term)
+            .annotate(similarity=TrigramSimilarity("summary", search_term))
+            .order_by("-similarity")[0:max_size]
+        )
 
         exclude_fields = ["modified", "processed_update"]
         try:

treeherder/perf/migrations/0036_cascade_perf_datum_deletion.py

@@ -1,15 +1,9 @@
 # Generated by Django 3.0.8 on 2020-12-11 14:42
 
 from django.db import migrations
-from django.conf import settings
 
 MULTICOMMIT_CONSTRAINT_SYMBOL = 'perf_multicommitdatu_perf_datum_id_c2d7eb14_fk_performan'
 
-if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.mysql':
-    DROP_TYPE = 'FOREIGN KEY'
-else:
-    DROP_TYPE = 'CONSTRAINT'
-
 
 class Migration(migrations.Migration):
     dependencies = [
@@ -21,7 +15,7 @@ class Migration(migrations.Migration):
             # add ON DELETE CASCADE at database level
             [
                 f'ALTER TABLE perf_multicommitdatum '
-                f'DROP {DROP_TYPE} {MULTICOMMIT_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE perf_multicommitdatum '
                 f'ADD CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (perf_datum_id) REFERENCES performance_datum (ID) ON DELETE CASCADE;',
@@ -29,7 +23,7 @@ class Migration(migrations.Migration):
             # put back the non-CASCADE foreign key constraint
             reverse_sql=[
                 f'ALTER TABLE perf_multicommitdatum '
-                f'DROP {DROP_TYPE} {MULTICOMMIT_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE perf_multicommitdatum '
                 f'ADD CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (perf_datum_id) REFERENCES performance_datum (ID);',

treeherder/perf/migrations/0044_perfdatum_bigint_fk.py

@@ -3,12 +3,6 @@ On large tables or production environment, it is recommanded to use an external
 to update the column and fake this migration. Migration perf.0045 will restore a valid django's schema.
 """
 from django.db import migrations, connection
-from django.conf import settings
-
-if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.mysql':
-    QUERY = "ALTER TABLE performance_datum MODIFY COLUMN id BIGINT(20) NOT NULL AUTO_INCREMENT"
-else:
-    QUERY = "ALTER TABLE performance_datum ALTER COLUMN id TYPE BIGINT using id::bigint"
 
 
 def alter_perfdatum_pk(apps, schema_editor):
@@ -24,7 +18,7 @@ def alter_perfdatum_pk(apps, schema_editor):
     if pursue.lower() not in ('', 'y', 'yes'):
         raise Exception("Aborting…")
     with connection.cursor() as cursor:
-        cursor.execute(QUERY)
+        cursor.execute("ALTER TABLE performance_datum ALTER COLUMN id TYPE BIGINT using id::bigint")
         return
 
 

treeherder/perf/migrations/0045_restore_perf_multicommitdatum_and_schema.py

@@ -1,29 +1,5 @@
-from django.db import migrations, models, connection
-from django.conf import settings
+from django.db import migrations, models
 import django.db.models.deletion
-from django.db.utils import DatabaseError
-
-
-def check_perfdatum_pk(apps, schema_editor):
-    """Ensure performance_datum FK has been updated to bigint type"""
-
-    # Not needed on postgresql
-    if settings.DATABASES['default']['ENGINE'] != 'django.db.backends.mysql':
-        return
-
-    with connection.cursor() as cursor:
-        cursor.execute(
-            "SELECT COLUMN_TYPE from INFORMATION_SCHEMA.COLUMNS WHERE "
-            f"""table_schema = '{connection.settings_dict["NAME"]}' and """
-            "table_name = 'performance_datum' and "
-            "COLUMN_NAME = 'id'"
-        )
-        column_type = cursor.fetchone()
-
-        if column_type != ("bigint(20)",):
-            raise DatabaseError(
-                f"PerformanceDatum PK column type is {column_type} but should be bigint(20)"
-            )
 
 
 class Migration(migrations.Migration):
@@ -36,10 +12,6 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
-        # Ensure the PK has been updated
-        migrations.RunPython(
-            check_perfdatum_pk,
-        ),
         # Empty SQL migration that update django state schema
         migrations.RunSQL(
             migrations.RunSQL.noop,

treeherder/perf/migrations/0046_restore_cascade_perf_datum_deletion.py

@@ -2,15 +2,9 @@
 It restores the DB side CASCADE deletion behavior for perf_multicommitdatum table toward performance_datum
 """
 from django.db import migrations
-from django.conf import settings
 
 MULTICOMMIT_CONSTRAINT_SYMBOL = 'perf_multicommitdatu_perf_datum_id_c2d7eb14_fk_performan'
 
-if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.mysql':
-    DROP_TYPE = 'FOREIGN KEY'
-else:
-    DROP_TYPE = 'CONSTRAINT'
-
 
 class Migration(migrations.Migration):
     dependencies = [
@@ -22,7 +16,7 @@ class Migration(migrations.Migration):
             # add ON DELETE CASCADE at database level
             [
                 f'ALTER TABLE perf_multicommitdatum '
-                f'DROP {DROP_TYPE} {MULTICOMMIT_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE perf_multicommitdatum '
                 f'ADD CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (perf_datum_id) REFERENCES performance_datum (ID) ON DELETE CASCADE;',
@@ -30,7 +24,7 @@ class Migration(migrations.Migration):
             # put back the non-CASCADE foreign key constraint
             reverse_sql=[
                 f'ALTER TABLE perf_multicommitdatum '
-                f'DROP {DROP_TYPE} {MULTICOMMIT_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE perf_multicommitdatum '
                 f'ADD CONSTRAINT {MULTICOMMIT_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (perf_datum_id) REFERENCES performance_datum (ID);',

treeherder/perf/migrations/0050_cascade_perf_datum_deletion_replicate.py

@@ -1,17 +1,11 @@
 # Generated by Django 3.0.8 on 2020-12-11 14:42
 
 from django.db import migrations
-from django.conf import settings
 
 DATUM_REPLICATE_CONSTRAINT_SYMBOL = (
     'performance_datum_re_performance_datum_id_fe2ed518_fk_performan'
 )
 
-if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.mysql':
-    DROP_TYPE = 'FOREIGN KEY'
-else:
-    DROP_TYPE = 'CONSTRAINT'
-
 
 class Migration(migrations.Migration):
     dependencies = [
@@ -23,7 +17,7 @@ class Migration(migrations.Migration):
             # add ON DELETE CASCADE at database level
             [
                 f'ALTER TABLE performance_datum_replicate '
-                f'DROP {DROP_TYPE} {DATUM_REPLICATE_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {DATUM_REPLICATE_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE performance_datum_replicate '
                 f'ADD CONSTRAINT {DATUM_REPLICATE_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (performance_datum_id) REFERENCES performance_datum (ID) ON DELETE CASCADE;',
@@ -31,7 +25,7 @@ class Migration(migrations.Migration):
             # put back the non-CASCADE foreign key constraint
             reverse_sql=[
                 f'ALTER TABLE performance_datum_replicate '
-                f'DROP {DROP_TYPE} {DATUM_REPLICATE_CONSTRAINT_SYMBOL};',
+                f'DROP CONSTRAINT {DATUM_REPLICATE_CONSTRAINT_SYMBOL};',
                 f'ALTER TABLE performance_datum_replicate '
                 f'ADD CONSTRAINT {DATUM_REPLICATE_CONSTRAINT_SYMBOL} '
                 f'FOREIGN KEY (performance_datum_id) REFERENCES performance_datum (ID);',

treeherder/push_health/builds.py

@@ -4,8 +4,7 @@ from django.db.models import Q
 
 
 def get_build_failures(push):
-    # icontains doesn't work with mysql unless collation settings are adjusted: https://code.djangoproject.com/ticket/9682
-    build_types = JobType.objects.filter(Q(name__contains="Build") | Q(name__contains="build"))
+    build_types = JobType.objects.filter(Q(name__icontains="build"))
 
     build_results = Job.objects.filter(
         push=push,