Merge pull request #19 from edx/saleem-latif/WL-322

WL-322: Update django wiki to support multi-tenancy

setup.py

@@ -29,7 +29,7 @@ def build_media_pattern(base_folder, file_extension):
 
 setup(
     name = "django-wiki",
-    version = "0.0.5",
+    version = "0.0.6",
     author = "Benjamin Bach",
     author_email = "[email protected]",
     description = ("A wiki system written for the Django framework."),

testproject/testproject/settings.py

@@ -69,6 +69,7 @@
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
+    'wiki.middleware.RequestCache',
     # Uncomment the next line for simple clickjacking protection:
     # 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 )

wiki/__init__.py

@@ -0,0 +1 @@
+from middleware import get_current_request

wiki/middleware.py

@@ -0,0 +1,62 @@
+import threading
+import importlib
+
+from django.conf import settings
+
+if getattr(settings, "WIKI_REQUEST_CACHE_MIDDLEWARE_CLASS", None):
+    class_name = settings.WIKI_REQUEST_CACHE_MIDDLEWARE_CLASS.split(".")[-1]
+    module = ".".join(settings.WIKI_REQUEST_CACHE_MIDDLEWARE_CLASS.split('.')[:-1])
+    RequestCache = getattr(importlib.import_module(module), class_name)
+else:
+    class _RequestCache(threading.local):
+        """
+        A thread-local for storing the per-request cache.
+        """
+        def __init__(self):
+            super(_RequestCache, self).__init__()
+            self.data = {}
+            self.request = None
+
+
+    REQUEST_CACHE = _RequestCache()
+
+
+    class RequestCache(object):
+        @classmethod
+        def get_request_cache(cls, name=None):
+            """
+            This method is deprecated. Please use :func:`request_cache.get_cache`.
+            """
+            if name is None:
+                return REQUEST_CACHE
+            else:
+                return REQUEST_CACHE.data.setdefault(name, {})
+
+        @classmethod
+        def get_current_request(cls):
+            """
+            This method is deprecated. Please use :func:`request_cache.get_request`.
+            """
+            return REQUEST_CACHE.request
+
+        @classmethod
+        def clear_request_cache(cls):
+            """
+            Empty the request cache.
+            """
+            REQUEST_CACHE.data = {}
+            REQUEST_CACHE.request = None
+
+        def process_request(self, request):
+            self.clear_request_cache()
+            REQUEST_CACHE.request = request
+            return None
+
+        def process_response(self, request, response):
+            self.clear_request_cache()
+            return response
+
+
+def get_current_request():
+    """Return the request associated with the current thread."""
+    return RequestCache.get_current_request()

wiki/models/urlpath.py

@@ -4,6 +4,7 @@
 from django.contrib.contenttypes import fields
 from django.contrib.contenttypes.models import ContentType
 from django.contrib.sites.models import Site
+from django.contrib.sites.shortcuts import get_current_site
 from django.core.exceptions import ValidationError
 from django.core.urlresolvers import reverse
 from django.db import models, transaction
@@ -14,6 +15,7 @@
 from mptt.models import MPTTModel
 
 from wiki import managers
+from wiki import get_current_request
 from wiki.conf import settings
 from wiki.core.exceptions import NoRootURL, MultipleRootURLs
 from wiki.models.article import ArticleRevision, ArticleForObject, Article
@@ -110,7 +112,7 @@ def delete_subtree(self):
 
     @classmethod
     def root(cls):
-        site = Site.objects.get_current()
+        site = get_current_site(get_current_request())
         root_nodes = list(
             cls.objects.root_nodes().filter(site=site).select_related_common()
         ) 
@@ -192,7 +194,7 @@ def get_absolute_url(self):
 
     @classmethod
     def create_root(cls, site=None, title="Root", **kwargs):
-        if not site: site = Site.objects.get_current()
+        if not site: site = get_current_site(get_current_request())
         root_nodes = cls.objects.root_nodes().filter(site=site)
         if not root_nodes:
             # (get_or_create does not work for MPTT models??)
@@ -210,7 +212,7 @@ def create_root(cls, site=None, title="Root", **kwargs):
     def create_article(cls, parent, slug, site=None, title="Root", article_kwargs={}, **kwargs):
         """Utility function:
         Create a new urlpath with an article and a new revision for the article"""
-        if not site: site = Site.objects.get_current()
+        if not site: site = get_current_site(get_current_request())
         article = Article(**article_kwargs)
         article.add_revision(ArticleRevision(title=title, **kwargs),
                              save=True)
@@ -241,8 +243,8 @@ def on_article_relation_save(instance, *args, **kwargs):
 def on_article_delete(instance, *args, **kwargs):
     # If an article is deleted, then throw out its URLPaths
     # But move all descendants to a lost-and-found node.
-    site = Site.objects.get_current()
-    
+    site = get_current_site(get_current_request())
+
     # Get the Lost-and-found path or create a new one
     try:
         lost_and_found = URLPath.objects.get(slug=settings.LOST_AND_FOUND_SLUG,