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venv/Lib/site-packages/django/contrib/sessions/backends/db.py

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+import logging
+
+from django.contrib.sessions.backends.base import (
+    CreateError, SessionBase, UpdateError,
+)
+from django.core.exceptions import SuspiciousOperation
+from django.db import DatabaseError, IntegrityError, router, transaction
+from django.utils import timezone
+from django.utils.functional import cached_property
+
+
+class SessionStore(SessionBase):
+    """
+    Implement database session store.
+    """
+    def __init__(self, session_key=None):
+        super().__init__(session_key)
+
+    @classmethod
+    def get_model_class(cls):
+        # Avoids a circular import and allows importing SessionStore when
+        # django.contrib.sessions is not in INSTALLED_APPS.
+        from django.contrib.sessions.models import Session
+        return Session
+
+    @cached_property
+    def model(self):
+        return self.get_model_class()
+
+    def _get_session_from_db(self):
+        try:
+            return self.model.objects.get(
+                session_key=self.session_key,
+                expire_date__gt=timezone.now()
+            )
+        except (self.model.DoesNotExist, SuspiciousOperation) as e:
+            if isinstance(e, SuspiciousOperation):
+                logger = logging.getLogger('django.security.%s' % e.__class__.__name__)
+                logger.warning(str(e))
+            self._session_key = None
+
+    def load(self):
+        s = self._get_session_from_db()
+        return self.decode(s.session_data) if s else {}
+
+    def exists(self, session_key):
+        return self.model.objects.filter(session_key=session_key).exists()
+
+    def create(self):
+        while True:
+            self._session_key = self._get_new_session_key()
+            try:
+                # Save immediately to ensure we have a unique entry in the
+                # database.
+                self.save(must_create=True)
+            except CreateError:
+                # Key wasn't unique. Try again.
+                continue
+            self.modified = True
+            return
+
+    def create_model_instance(self, data):
+        """
+        Return a new instance of the session model object, which represents the
+        current session state. Intended to be used for saving the session data
+        to the database.
+        """
+        return self.model(
+            session_key=self._get_or_create_session_key(),
+            session_data=self.encode(data),
+            expire_date=self.get_expiry_date(),
+        )
+
+    def save(self, must_create=False):
+        """
+        Save the current session data to the database. If 'must_create' is
+        True, raise a database error if the saving operation doesn't create a
+        new entry (as opposed to possibly updating an existing entry).
+        """
+        if self.session_key is None:
+            return self.create()
+        data = self._get_session(no_load=must_create)
+        obj = self.create_model_instance(data)
+        using = router.db_for_write(self.model, instance=obj)
+        try:
+            with transaction.atomic(using=using):
+                obj.save(force_insert=must_create, force_update=not must_create, using=using)
+        except IntegrityError:
+            if must_create:
+                raise CreateError
+            raise
+        except DatabaseError:
+            if not must_create:
+                raise UpdateError
+            raise
+
+    def delete(self, session_key=None):
+        if session_key is None:
+            if self.session_key is None:
+                return
+            session_key = self.session_key
+        try:
+            self.model.objects.get(session_key=session_key).delete()
+        except self.model.DoesNotExist:
+            pass
+
+    @classmethod
+    def clear_expired(cls):
+        cls.get_model_class().objects.filter(expire_date__lt=timezone.now()).delete()