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# GNU MediaGoblin -- federated, autonomous media hosting
# Copyright (C) 2011 MediaGoblin contributors. See AUTHORS.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import urllib
import routes
from webob import Request, exc
from mediagoblin import routing, util, middleware
from mediagoblin.mg_globals import setup_globals
from mediagoblin.init.celery import setup_celery_from_config
from mediagoblin.init import (get_jinja_loader, get_staticdirector,
setup_global_and_app_config, setup_workbench, setup_database,
setup_storage)
class MediaGoblinApp(object):
"""
WSGI application of MediaGoblin
... this is the heart of the program!
"""
def __init__(self, config_path, setup_celery=True):
"""
Initialize the application based on a configuration file.
Arguments:
- config_path: path to the configuration file we're opening.
- setup_celery: whether or not to setup celery during init.
(Note: setting 'celery_setup_elsewhere' also disables
setting up celery.)
"""
##############
# Setup config
##############
# Open and setup the config
global_config, app_config = setup_global_and_app_config(config_path)
##########################################
# Setup other connections / useful objects
##########################################
# Set up the database
self.connection, self.db = setup_database()
# Get the template environment
self.template_loader = get_jinja_loader(
app_config.get('user_template_path'))
# Set up storage systems
self.public_store, self.queue_store = setup_storage()
# set up routing
self.routing = routing.get_mapper()
# set up staticdirector tool
self.staticdirector = get_staticdirector(app_config)
# Setup celery, if appropriate
if setup_celery and not app_config.get('celery_setup_elsewhere'):
if os.environ.get('CELERY_ALWAYS_EAGER'):
setup_celery_from_config(
app_config, global_config,
force_celery_always_eager=True)
else:
setup_celery_from_config(app_config, global_config)
#######################################################
# Insert appropriate things into mediagoblin.mg_globals
#
# certain properties need to be accessed globally eg from
# validators, etc, which might not access to the request
# object.
#######################################################
setup_globals(app = self)
# Workbench *currently* only used by celery, so this only
# matters in always eager mode :)
setup_workbench()
# instantiate application middleware
self.middleware = [util.import_component(m)(self)
for m in middleware.ENABLED_MIDDLEWARE]
def __call__(self, environ, start_response):
request = Request(environ)
# pass the request through our middleware classes
for m in self.middleware:
response = m.process_request(request)
if response is not None:
return response(environ, start_response)
## Routing / controller loading stuff
path_info = request.path_info
route_match = self.routing.match(path_info)
## Attach utilities to the request object
request.matchdict = route_match
request.urlgen = routes.URLGenerator(self.routing, environ)
# Do we really want to load this via middleware? Maybe?
request.session = request.environ['beaker.session']
# Attach self as request.app
# Also attach a few utilities from request.app for convenience?
request.app = self
request.locale = util.get_locale_from_request(request)
request.template_env = util.get_jinja_env(
self.template_loader, request.locale)
request.db = self.db
request.staticdirect = self.staticdirector
util.setup_user_in_request(request)
# No matching page?
if route_match is None:
# Try to do see if we have a match with a trailing slash
# added and if so, redirect
if not path_info.endswith('/') \
and request.method == 'GET' \
and self.routing.match(path_info + '/'):
new_path_info = path_info + '/'
if request.GET:
new_path_info = '%s?%s' % (
new_path_info, urllib.urlencode(request.GET))
redirect = exc.HTTPFound(location=new_path_info)
return request.get_response(redirect)(environ, start_response)
# Okay, no matches. 404 time!
request.matchdict = {} # in case our template expects it
return util.render_404(request)(environ, start_response)
controller = util.import_component(route_match['controller'])
request.start_response = start_response
# get the response from the controller
response = controller(request)
# pass the response through the middleware
for m in self.middleware[::-1]:
m.process_response(request, response)
return response(environ, start_response)
def paste_app_factory(global_config, **app_config):
mgoblin_app = MediaGoblinApp(app_config['config'])
return mgoblin_app
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