Add redis result backend support

This commit changes the Celery result backend to redis as it has already
been done for the webinterface and gvaldap parts of gnuviechadmin.

gvafile/gvafile/settings.py

@@ -8,7 +8,7 @@ Common settings and globals.
 from os import environ
 
 
-def get_env_setting(setting):
+def get_env_variable(setting):
     """
     Get the environment setting or return exception.
 
@@ -27,7 +27,7 @@ def get_env_setting(setting):
 ########## CELERY CONFIGURATION
 CELERY_TIMEZONE = 'Europe/Berlin'
 CELERY_ENABLE_UTC = True
-CELERY_RESULT_BACKEND = 'amqp'
+CELERY_RESULT_BACKEND = get_env_variable('GVAFILE_RESULTS_REDIS_URL')
 CELERY_RESULT_PERSISTENT = True
 CELERY_TASK_RESULT_EXPIRES = None
 CELERY_ROUTES = (
@@ -36,12 +36,12 @@ CELERY_ROUTES = (
 CELERY_ACCEPT_CONTENT = ['json']
 CELERY_TASK_SERIALIZER = 'json'
 CELERY_RESULT_SERIALIZER = 'json'
-BROKER_URL = get_env_setting('GVAFILE_BROKER_URL')
+BROKER_URL = get_env_variable('GVAFILE_BROKER_URL')
 ########## END CELERY CONFIGURATION
 
 ########## GVAFILE CONFIGURATION
-GVAFILE_SFTP_DIRECTORY = get_env_setting('GVAFILE_SFTP_DIRECTORY')
-GVAFILE_MAIL_DIRECTORY = get_env_setting('GVAFILE_MAIL_DIRECTORY')
-GVAFILE_SFTP_AUTHKEYS_DIRECTORY = get_env_setting(
+GVAFILE_SFTP_DIRECTORY = get_env_variable('GVAFILE_SFTP_DIRECTORY')
+GVAFILE_MAIL_DIRECTORY = get_env_variable('GVAFILE_MAIL_DIRECTORY')
+GVAFILE_SFTP_AUTHKEYS_DIRECTORY = get_env_variable(
     'GVAFILE_SFTP_AUTHKEYS_DIRECTORY')
 ########## END GVAFILE CONFIGURATION

requirements/base.txt

@@ -6,3 +6,4 @@ kombu==3.0.33
 pytz==2015.7
 PyYAML==3.11
 -e git+https://git.gnuviech-server.de/gvacommon.git@0.3.0#egg=gvacommon
+redis==2.10.5