74 lines
2.4 KiB
Python
74 lines
2.4 KiB
Python
import datetime
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from django.contrib.sessions.models import Session
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from django.contrib.sessions.backends.base import SessionBase, CreateError
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from django.core.exceptions import SuspiciousOperation
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from django.db import IntegrityError, transaction
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from django.utils.encoding import force_unicode
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class SessionStore(SessionBase):
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"""
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Implements database session store.
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"""
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def load(self):
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try:
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s = Session.objects.get(
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session_key = self.session_key,
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expire_date__gt=datetime.datetime.now()
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)
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return self.decode(force_unicode(s.session_data))
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except (Session.DoesNotExist, SuspiciousOperation):
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self.create()
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return {}
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def exists(self, session_key):
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try:
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Session.objects.get(session_key=session_key)
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except Session.DoesNotExist:
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return False
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return True
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def create(self):
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while True:
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self.session_key = self._get_new_session_key()
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try:
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# Save immediately to ensure we have a unique entry in the
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# database.
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self.save(must_create=True)
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except CreateError:
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# Key wasn't unique. Try again.
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continue
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self.modified = True
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self._session_cache = {}
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return
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def save(self, must_create=False):
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"""
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Saves the current session data to the database. If 'must_create' is
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True, a database error will be raised if the saving operation doesn't
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create a *new* entry (as opposed to possibly updating an existing
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entry).
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"""
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obj = Session(
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session_key = self.session_key,
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session_data = self.encode(self._get_session(no_load=must_create)),
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expire_date = self.get_expiry_date()
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)
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sid = transaction.savepoint()
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try:
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obj.save(force_insert=must_create)
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except IntegrityError:
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if must_create:
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transaction.savepoint_rollback(sid)
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raise CreateError
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raise
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def delete(self, session_key=None):
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if session_key is None:
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if self._session_key is None:
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return
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session_key = self._session_key
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try:
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Session.objects.get(session_key=session_key).delete()
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except Session.DoesNotExist:
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pass
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