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[bluechips.git] / bluechips / config / middleware.py
1 """Pylons middleware initialization"""
2 from beaker.middleware import CacheMiddleware, SessionMiddleware
3 from paste.cascade import Cascade
4 from paste.registry import RegistryManager
5 from paste.urlparser import StaticURLParser
6 from paste.deploy.converters import asbool
7 from pylons import config
8 from pylons.middleware import ErrorHandler, StaticJavascripts, \
9     StatusCodeRedirect
10 from pylons.wsgiapp import PylonsApp
11 from routes.middleware import RoutesMiddleware
12 from paste import httpexceptions
13
14 from tw.api import make_middleware
15
16 from bluechips.config.environment import load_environment
17
18 def make_app(global_conf, full_stack=True, **app_conf):
19     """Create a Pylons WSGI application and return it
20
21     ``global_conf``
22         The inherited configuration for this application. Normally from
23         the [DEFAULT] section of the Paste ini file.
24
25     ``full_stack``
26         Whether or not this application provides a full WSGI stack (by
27         default, meaning it handles its own exceptions and errors).
28         Disable full_stack when this application is "managed" by
29         another WSGI middleware.
30
31     ``app_conf``
32         The application's local configuration. Normally specified in the
33         [app:<name>] section of the Paste ini file (where <name>
34         defaults to main).
35     """
36     # Configure the Pylons environment
37     load_environment(global_conf, app_conf)
38
39     # The Pylons WSGI app
40     app = PylonsApp()
41     
42     # CUSTOM MIDDLEWARE HERE (filtered by error handling middlewares)
43     app = httpexceptions.make_middleware(app, global_conf)
44     
45     # Routing/Session/Cache Middleware
46     app = RoutesMiddleware(app, config['routes.map'])
47     app = SessionMiddleware(app, config)
48     app = CacheMiddleware(app, config)
49     
50     app = make_middleware(app, {
51             'toscawidgets.framework': 'pylons',
52             'toscawidgets.framework.default_view': 'mako',
53             'toscawidgets.middleware.inject_resources': True
54             })
55     
56     if asbool(full_stack):
57         # Handle Python exceptions
58         app = ErrorHandler(app, global_conf, **config['pylons.errorware'])
59
60         # Display error documents for 401, 403, 404 status codes (and
61         # 500 when debug is disabled)
62         if asbool(config['debug']):
63             app = StatusCodeRedirect(app)
64         else:
65             app = StatusCodeRedirect(app, [400, 401, 403, 404, 500])
66
67     # Establish the Registry for this application
68     app = RegistryManager(app)
69
70     # Static files (If running in production, and Apache or another web 
71     # server is handling this static content, remove the following 3 lines)
72     static_app = StaticURLParser(config['pylons.paths']['static_files'])
73     app = Cascade([static_app, app])
74     return app