added replication safe decorators for use with master, slave environm…

…ents

django_facebook/__init__.py

@@ -4,7 +4,7 @@
 
 
 __license__ = 'BSD'
-__version__ = '4.0.4'
+__version__ = '4.0.5'
 __maintainer__ = 'Thierry Schellenbach'
 __email__ = 'thierryschellenbach@gmail.com'
 __status__ = 'Production'

django_facebook/auth_urls.py

@@ -27,14 +27,15 @@
 
 from django.contrib.auth import views as auth_views
 from django_facebook import registration_views
+from django_facebook.utils import replication_safe
 
 urlpatterns = patterns('',
                        url(r'^login/$',
-                           auth_views.login,
+                           replication_safe(auth_views.login),
                            {'template_name': 'registration/login.html'},
                            name='auth_login'),
                        url(r'^logout/$',
-                           auth_views.logout,
+                           replication_safe(auth_views.logout),
                            {'template_name': 'registration/logout.html'},
                            name='auth_logout'),
                        url(r'^password/change/$',

django_facebook/decorators.py

@@ -123,3 +123,6 @@ def facebook_connect_required():
     """
     #TODO: BUILD THIS :)
     pass
+
+
+

django_facebook/utils.py

@@ -352,6 +352,27 @@ def cleanup_oauth_url(redirect_uri):
     return redirect_uri
 
 
+def replication_safe(f):
+    '''
+    Usually views which do a POST will require the next page to be 
+    read from the master database. (To prevent issues with replication lag).
+    
+    However certain views like login do not have this issue.
+    They do a post, but don't modify data which you'll show on subsequent pages.
+    
+    This decorators marks these views as safe.
+    This ensures requests on the next page are allowed to use the slave db
+    '''
+    from functools import wraps
+
+    @wraps(f)
+    def wrapper(request, *args, **kwargs):
+        request.replication_safe = True
+        response = f(request, *args, **kwargs)
+        return response
+
+    return wrapper
+
 def get_class_from_string(path, default='raise'):
     """
     Return the class specified by the string.

django_facebook/views.py

@@ -15,7 +15,8 @@
     require_persistent_graph
 from django_facebook.canvas import generate_oauth_url
 from django_facebook.connect import CONNECT_ACTIONS, connect_user
-from django_facebook.utils import next_redirect, get_registration_backend
+from django_facebook.utils import next_redirect, get_registration_backend,\
+    replication_safe
 from django_facebook.decorators import (facebook_required,
                                         facebook_required_lazy)
 from open_facebook.utils import send_warning
@@ -66,6 +67,7 @@ def image_upload(request):
 
 
 @csrf_exempt
+@replication_safe
 @facebook_required_lazy(extra_params=dict(facebook_login='1'))
 def connect(request):
     '''