Switch from abandoned python-memcached to pylibmc

See linsomniac/python-memcached#95

Author: PaulSD

docs/source/upgrade/upgrade-to-tendenci8.txt

@@ -19,6 +19,10 @@ Make sure the required system dependencies are installed:
       libjpeg8 libjpeg-dev libfreetype6 libfreetype6-dev
     sudo apt-get install curl wget
 
+If this is a live site using memcached, also make sure libmemcached-dev is installed:
+::
+
+    sudo apt-get install libmemcached-dev
 
 Shut down Tendenci:
 ::
@@ -60,6 +64,9 @@ Tendenci and Python upgrades):
 
     cd /var/www/tendenci/
     source /srv/tendenci/bin/activate
+    # For development installations:
+    pip install --no-binary psycopg2 -r requirements/dev.txt --upgrade
+    # For live sites:
     pip install --no-binary psycopg2 -r requirements/prod.txt --upgrade
 
 
@@ -100,6 +107,9 @@ Upgrade Tendenci and its dependencies:
     sudo chown -Rh "$(id -u -n)": /srv/tendenci/
     source /srv/tendenci/venv/bin/activate  # For Python 2
     source /srv/tendenci/bin/activate  # For Python 3
+    # For development installations:
+    pip install --no-binary psycopg2 -r requirements/dev.txt --upgrade
+    # For live sites:
     pip install --no-binary psycopg2 -r requirements/prod.txt --upgrade
 
 
@@ -267,6 +277,9 @@ shown in the "Custom Application Settings" section of the latest
 `settings.py <https://github.com/tendenci/tendenci-project-template/blob/tendenci8/conf/settings.py>`_
 file.
 
+Replace ``django.core.cache.backends.memcached.MemcachedCache`` with
+``django.core.cache.backends.memcached.PyLibMCCache``
+
 If present, replace ``tendenci.apps.theme.template_loaders.Loader`` with
 ``tendenci.apps.theme.template_loaders.ThemeLoader``
 

requirements.txt

@@ -43,7 +43,6 @@ chardet==3.0.3
 psycopg2>=2.7,<2.8
 gunicorn==19.5.0
 django-storages==1.4.1
-python-memcached==1.59
 Whoosh==2.7.4
 simple-salesforce==0.68.1
 selenium==2.53.2

tendenci/settings.py

@@ -303,11 +303,15 @@ def disable_template_cache():  # For use in site-specific settings.py
 
 CACHES = {
     'default': {
-        'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
+        'BACKEND': 'django.core.cache.backends.memcached.PyLibMCCache',
         'LOCATION': '127.0.0.1:11211',
         'TIMEOUT': 60*60*24*30,  # 30 days
     }
 }
+try:
+    import pylibmc
+except ImportError:
+    CACHES['default']['BACKEND'] = 'django.core.cache.backends.dummy.DummyCache'
 
 LOGGING = {
     'version': 1,