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comparison flowerbed/dispatcher.py @ 0:0613e2bb0ebe

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initial creation of flowerbed
author Jeff Hammel <jhammel@mozilla.com>
date Mon, 20 Dec 2010 09:24:48 -0800
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-1:000000000000 0:0613e2bb0ebe
1 """
2 request dispatcher:
3 data persisting across requests should go here
4 """
5
6 import os
7
8 from handlers import Index
9
10 from genshi.template import TemplateLoader
11 from paste.fileapp import FileApp
12 from pkg_resources import resource_filename
13 from webob import Request, Response, exc
14
15 class Dispatcher(object):
16
17 ### class level variables
18 defaults = { 'auto_reload': 'False',
19 'template_dirs': '',
20 'app': None,
21 'name': 'anonymous' }
22
23 def __init__(self, **kw):
24
25 # set instance parameters from kw and defaults
26 for key in self.defaults:
27 setattr(self, key, kw.get(key, self.defaults[key]))
28 self.auto_reload = self.auto_reload.lower() == 'true'
29
30 # request handlers
31 self.handlers = [ Index ]
32
33 # endpoint app if used as middleware
34 if self.app:
35 assert hasattr(self.app, '__call__')
36
37 # template loader
38 self.template_dirs = self.template_dirs.split()
39 self.template_dirs.append(resource_filename(__name__, 'templates'))
40 self.loader = TemplateLoader(self.template_dirs,
41 auto_reload=self.auto_reload)
42
43 def __call__(self, environ, start_response):
44
45 # get a request object
46 request = Request(environ)
47
48 # get the path
49 path = request.path_info.strip('/').split('/')
50 if path == ['']:
51 path = []
52 request.environ['path'] = path
53
54 # match the request to a handler
55 for h in self.handlers:
56 handler = h.match(self, request)
57 if handler is not None:
58 break
59 else:
60 if self.app:
61 return self.app(environ, start_response)
62 handler = exc.HTTPNotFound
63
64 # add navigation links to handler [example]
65 if hasattr(handler, 'data'):
66 handler.data.setdefault('links', [])
67 for h in self.handlers:
68 handler.data['links'].append((handler.link(h.handler_path),
69 h.__name__))
70
71 # get response
72 res = handler()
73 return res(environ, start_response)