From b740706707aed9f057a2f8badc31bc87997c6142 Mon Sep 17 00:00:00 2001
From: Malcolm Tredinnick <malcolm.tredinnick@gmail.com>
Date: Sun, 1 Mar 2009 08:13:38 +0000
Subject: [PATCH] Changed the way cache specifiers are parsed.

Allows us to reuse the same code in multiple places, avoiding new and
interesting bugs (the testing framework had a DIY version that was slightly
wrong, for example). Fixed #9833.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9936 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/core/cache/__init__.py  | 11 ++++++++++-
 django/db/backends/creation.py |  9 +++++----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/django/core/cache/__init__.py b/django/core/cache/__init__.py
index 93e7adb76e..23a61ef859 100644
--- a/django/core/cache/__init__.py
+++ b/django/core/cache/__init__.py
@@ -31,7 +31,12 @@ BACKENDS = {
     'dummy': 'dummy',
 }
 
-def get_cache(backend_uri):
+def parse_backend_uri(backend_uri):
+    """
+    Converts the "backend_uri" into a cache scheme ('db', 'memcached', etc), a
+    host and any extra params that are required for the backend. Returns a
+    (scheme, host, params) tuple.
+    """
     if backend_uri.find(':') == -1:
         raise InvalidCacheBackendError, "Backend URI must start with scheme://"
     scheme, rest = backend_uri.split(':', 1)
@@ -48,6 +53,10 @@ def get_cache(backend_uri):
     if host.endswith('/'):
         host = host[:-1]
 
+    return scheme, host, params
+
+def get_cache(backend_uri):
+    scheme, host, params = parse_backend_uri(backend_uri)
     if scheme in BACKENDS:
         module = __import__('django.core.cache.backends.%s' % BACKENDS[scheme], {}, {}, [''])
     else:
diff --git a/django/db/backends/creation.py b/django/db/backends/creation.py
index b53e9f1007..e6399874ef 100644
--- a/django/db/backends/creation.py
+++ b/django/db/backends/creation.py
@@ -312,11 +312,12 @@ class BaseDatabaseCreation(object):
         self.connection.close()
         settings.DATABASE_NAME = test_database_name
         settings.DATABASE_SUPPORTS_TRANSACTIONS = self._rollback_works()
-        
+
         call_command('syncdb', verbosity=verbosity, interactive=False)
 
         if settings.CACHE_BACKEND.startswith('db://'):
-            cache_name = settings.CACHE_BACKEND[len('db://'):]
+            from django.core.cache import parse_backend_uri
+            _, cache_name, _ = parse_backend_uri(settings.CACHE_BACKEND)
             call_command('createcachetable', cache_name)
 
         # Get a cursor (even though we don't need one yet). This has
@@ -363,7 +364,7 @@ class BaseDatabaseCreation(object):
                 sys.exit(1)
 
         return test_database_name
-    
+
     def _rollback_works(self):
         cursor = self.connection.cursor()
         cursor.execute('CREATE TABLE ROLLBACK_TEST (X INT)')
@@ -375,7 +376,7 @@ class BaseDatabaseCreation(object):
         cursor.execute('DROP TABLE ROLLBACK_TEST')
         self.connection._commit()
         return count == 0
-        
+
     def destroy_test_db(self, old_database_name, verbosity=1):
         """
         Destroy a test database, prompting the user for confirmation if the