add django 4.2 support (#351)

* add django 4.2 support

Author: BeryJu

CHANGELOG.md

@@ -7,6 +7,7 @@
 * Support new cache backend names in newer Django versions, Thanks [@tneuct](https://github.com/korfuri/django-prometheus/pull/329)
 * Make export of migrations False by default, Thanks [@kaypee90](https://github.com/korfuri/django-prometheus/pull/313)
 * Add support for Django 4.1, Python 3.11
+* Add support for Django 4.2 and Psycopg 3
 
 ## v2.2.0 - December 19, 2021
 

django_prometheus/db/backends/postgis/base.py

@@ -1,13 +1,18 @@
-import psycopg2.extensions
+from django import VERSION
 from django.contrib.gis.db.backends.postgis import base
 
 from django_prometheus.db.common import DatabaseWrapperMixin, ExportingCursorWrapper
 
+if VERSION < (4, 2):
+    from psycopg2.extensions import cursor as cursor_cls
+else:
+    from django.db.backends.postgresql.base import Cursor as cursor_cls
+
 
 class DatabaseWrapper(DatabaseWrapperMixin, base.DatabaseWrapper):
     def get_connection_params(self):
         conn_params = super().get_connection_params()
-        conn_params["cursor_factory"] = ExportingCursorWrapper(psycopg2.extensions.cursor, "postgis", self.vendor)
+        conn_params["cursor_factory"] = ExportingCursorWrapper(cursor_cls, "postgis", self.vendor)
         return conn_params
 
     def create_cursor(self, name=None):

django_prometheus/db/backends/postgresql/base.py

@@ -1,19 +1,18 @@
-import psycopg2.extensions
-from django.db.backends.postgresql import base
+from django import VERSION
+from django.contrib.gis.db.backends.postgis import base
 
 from django_prometheus.db.common import DatabaseWrapperMixin, ExportingCursorWrapper
 
-
-class DatabaseFeatures(base.DatabaseFeatures):
-    """Our database has the exact same features as the base one."""
-
-    pass
+if VERSION < (4, 2):
+    from psycopg2.extensions import cursor as cursor_cls
+else:
+    from django.db.backends.postgresql.base import Cursor as cursor_cls
 
 
 class DatabaseWrapper(DatabaseWrapperMixin, base.DatabaseWrapper):
     def get_connection_params(self):
         conn_params = super().get_connection_params()
-        conn_params["cursor_factory"] = ExportingCursorWrapper(psycopg2.extensions.cursor, self.alias, self.vendor)
+        conn_params["cursor_factory"] = ExportingCursorWrapper(cursor_cls, self.alias, self.vendor)
         return conn_params
 
     def create_cursor(self, name=None):

setup.py

@@ -59,6 +59,7 @@ def get_version():
         "Framework :: Django :: 3.2",
         "Framework :: Django :: 4.0",
         "Framework :: Django :: 4.1",
+        "Framework :: Django :: 4.2",
         "Topic :: System :: Monitoring",
         "License :: OSI Approved :: Apache Software License",
     ],