feat: add async PostgreSQL fixture support

newsfragments/1235.feature.rst

@@ -0,0 +1,3 @@
+Added async PostgreSQL fixture support via ``postgresql_async`` factory and ``AsyncDatabaseJanitor``.
+Added configurable fixture ``scope`` parameter to ``postgresql``, ``postgresql_async``, ``postgresql_proc``, and ``postgresql_noproc`` factories (defaults preserved: ``"function"`` for client fixtures, ``"session"`` for process fixtures).
+Added optional ``async`` extra (``pip install pytest-postgresql[async]``) providing ``pytest-asyncio`` and ``aiofiles`` dependencies.

pyproject.toml

@@ -36,6 +36,12 @@ dependencies = [
 ]
 requires-python = ">= 3.10"
 
+[project.optional-dependencies]
+async = [
+  "pytest-asyncio >= 0.21",
+  "aiofiles >= 23.0"
+]
+
 [project.urls]
 "Source" = "https://github.com/dbfixtures/pytest-postgresql"
 "Bug Tracker" = "https://github.com/dbfixtures/pytest-postgresql/issues"

pytest_postgresql/factories/__init__.py

@@ -17,8 +17,8 @@
 # along with pytest-postgresql.  If not, see <http://www.gnu.org/licenses/>.
 """Fixture factories for postgresql fixtures."""
 
-from pytest_postgresql.factories.client import postgresql
+from pytest_postgresql.factories.client import postgresql, postgresql_async
 from pytest_postgresql.factories.noprocess import postgresql_noproc
 from pytest_postgresql.factories.process import PortType, postgresql_proc
 
-__all__ = ("postgresql_proc", "postgresql_noproc", "postgresql", "PortType")
+__all__ = ("postgresql_proc", "postgresql_noproc", "postgresql", "postgresql_async", "PortType")

pytest_postgresql/factories/client.py

@@ -17,36 +17,44 @@
 # along with pytest-postgresql.  If not, see <http://www.gnu.org/licenses/>.
 """Fixture factory for postgresql client."""
 
-from typing import Callable, Iterator
+from typing import AsyncIterator, Callable, Iterator
 
 import psycopg
 import pytest
-from psycopg import Connection
+from psycopg import AsyncConnection, Connection
 from pytest import FixtureRequest
 
+try:
+    import pytest_asyncio
+except ImportError:
+    pytest_asyncio = None  # type: ignore[assignment]
+
 from pytest_postgresql.config import get_config
 from pytest_postgresql.executor import PostgreSQLExecutor
 from pytest_postgresql.executor_noop import NoopExecutor
-from pytest_postgresql.janitor import DatabaseJanitor
+from pytest_postgresql.janitor import AsyncDatabaseJanitor, DatabaseJanitor
+from pytest_postgresql.types import FixtureScopeT
 
 
 def postgresql(
     process_fixture_name: str,
     dbname: str | None = None,
     isolation_level: "psycopg.IsolationLevel | None" = None,
+    scope: FixtureScopeT = "function",
 ) -> Callable[[FixtureRequest], Iterator[Connection]]:
     """Return connection fixture factory for PostgreSQL.
 
     :param process_fixture_name: name of the process fixture
     :param dbname: database name
     :param isolation_level: optional postgresql isolation level
                             defaults to server's default
+    :param scope: fixture scope; by default "function" which is recommended.
     :returns: function which makes a connection to postgresql
     """
 
-    @pytest.fixture
+    @pytest.fixture(scope=scope)
     def postgresql_factory(request: FixtureRequest) -> Iterator[Connection]:
-        """Fixture factory for PostgreSQL.
+        """Fixture connection factory for PostgreSQL.
 
         :param request: fixture request object
         :returns: postgresql client
@@ -85,3 +93,72 @@ def postgresql_factory(request: FixtureRequest) -> Iterator[Connection]:
             db_connection.close()
 
     return postgresql_factory
+
+
+def postgresql_async(
+    process_fixture_name: str,
+    dbname: str | None = None,
+    isolation_level: "psycopg.IsolationLevel | None" = None,
+    scope: FixtureScopeT = "function",
+) -> Callable[[FixtureRequest], AsyncIterator[AsyncConnection]]:
+    """Return async connection fixture factory for PostgreSQL.
+
+    :param process_fixture_name: name of the process fixture
+    :param dbname: database name
+    :param isolation_level: optional postgresql isolation level
+                            defaults to server's default
+    :param scope: fixture scope; by default "function" which is recommended.
+    :returns: function which makes an async connection to postgresql
+    """
+    if pytest_asyncio is None:
+
+        @pytest.fixture(scope=scope)
+        def postgresql_async_factory(request: FixtureRequest) -> None:
+            """Sync stub that raises ImportError when pytest-asyncio is absent."""
+            raise ImportError(
+                "pytest-asyncio is required for async fixtures. Install it with: pip install pytest-postgresql[async]"
+            )
+
+        return postgresql_async_factory  # type: ignore[return-value]
+
+    @pytest_asyncio.fixture(scope=scope, loop_scope=scope)
+    async def postgresql_async_factory(request: FixtureRequest) -> AsyncIterator[AsyncConnection]:
+        """Async connection fixture factory for PostgreSQL.
+
+        :param request: fixture request object
+        :returns: postgresql async client
+        """
+        proc_fixture: PostgreSQLExecutor | NoopExecutor = request.getfixturevalue(process_fixture_name)
+        config = get_config(request)
+
+        pg_host = proc_fixture.host
+        pg_port = proc_fixture.port
+        pg_user = proc_fixture.user
+        pg_password = proc_fixture.password
+        pg_options = proc_fixture.options
+        pg_db = dbname or proc_fixture.dbname
+        janitor = AsyncDatabaseJanitor(
+            user=pg_user,
+            host=pg_host,
+            port=pg_port,
+            dbname=pg_db,
+            template_dbname=proc_fixture.template_dbname,
+            version=proc_fixture.version,
+            password=pg_password,
+            isolation_level=isolation_level,
+        )
+        if config.drop_test_database:
+            await janitor.drop()
+        async with janitor:
+            db_connection: AsyncConnection = await AsyncConnection.connect(
+                dbname=pg_db,
+                user=pg_user,
+                password=pg_password,
+                host=pg_host,
+                port=pg_port,
+                options=pg_options,
+            )
+            yield db_connection
+            await db_connection.close()
+
+    return postgresql_async_factory

pytest_postgresql/factories/noprocess.py

@@ -27,6 +27,7 @@
 from pytest_postgresql.config import get_config
 from pytest_postgresql.executor_noop import NoopExecutor
 from pytest_postgresql.janitor import DatabaseJanitor
+from pytest_postgresql.types import FixtureScopeT
 
 
 def xdistify_dbname(dbname: str) -> str:
@@ -46,6 +47,7 @@ def postgresql_noproc(
     options: str = "",
     load: list[Callable | str | Path] | None = None,
     depends_on: str | None = None,
+    scope: FixtureScopeT = "session",
 ) -> Callable[[FixtureRequest], Iterator[NoopExecutor]]:
     """Postgresql noprocess factory.
 
@@ -57,10 +59,11 @@ def postgresql_noproc(
     :param options: Postgresql connection options
     :param load: List of functions used to initialize database's template.
     :param depends_on: Optional name of the fixture to depend on.
+    :param scope: fixture scope; by default "session" which is recommended.
     :returns: function which makes a postgresql process
     """
 
-    @pytest.fixture(scope="session")
+    @pytest.fixture(scope=scope)
     def postgresql_noproc_fixture(request: FixtureRequest) -> Iterator[NoopExecutor]:
         """Noop Process fixture for PostgreSQL.
 

pytest_postgresql/factories/process.py

@@ -32,6 +32,7 @@
 from pytest_postgresql.exceptions import ExecutableMissingException
 from pytest_postgresql.executor import PostgreSQLExecutor
 from pytest_postgresql.janitor import DatabaseJanitor
+from pytest_postgresql.types import FixtureScopeT
 
 PortType = port_for.PortType  # mypy requires explicit export
 
@@ -81,6 +82,7 @@ def postgresql_proc(
     unixsocketdir: str | None = None,
     postgres_options: str | None = None,
     load: list[Callable | str | Path] | None = None,
+    scope: FixtureScopeT = "session",
 ) -> Callable[[FixtureRequest, TempPathFactory], Iterator[PostgreSQLExecutor]]:
     """Postgresql process factory.
 
@@ -101,10 +103,11 @@ def postgresql_proc(
     :param unixsocketdir: directory to create postgresql's unixsockets
     :param postgres_options: Postgres executable options for use by pg_ctl
     :param load: List of functions used to initialize database's template.
+    :param scope: fixture scope; by default "session" which is recommended.
     :returns: function which makes a postgresql process
     """
 
-    @pytest.fixture(scope="session")
+    @pytest.fixture(scope=scope)
     def postgresql_proc_fixture(
         request: FixtureRequest, tmp_path_factory: TempPathFactory
     ) -> Iterator[PostgreSQLExecutor]: