Mercurial > hg > TagInTheMiddle

annotate taginthemiddle/middleware.py @ 3:c2bb8f873aee

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make a useful(?) example factory
author Jeff Hammel <jhammel@mozilla.com>
date Wed, 05 May 2010 22:05:16 -0700
parents 1182315b18ac
children 8fb20b780341
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1 """
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2 request dispatcher:
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3 data persisting across requests should go here
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4 """
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5
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6 import os
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7
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8 from handlers import TagCloud, ViewTags, PostTags
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9 from model import Tags
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10
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11 from genshi.template import TemplateLoader
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12 from lxmlmiddleware import LXMLMiddleware
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13 from paste.fileapp import FileApp
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14 from pkg_resources import resource_filename
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15 from webob import Request, Response, exc
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17 class Tagger(LXMLMiddleware):
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19 # instance defaults
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20 defaults = { 'auto_reload': 'False',
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21 'template_dirs': '',
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22 'patterns': '*'
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23 'tags_file': None,
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24 'tags_url': 'tags',
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25 'post_url': '.tags',
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26 'author': None, # for RSS
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27 }
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29 def __init__(self, app, **kw):
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30 self.app = app
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31
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32 # set instance parameters from kw and defaults
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33 for key in self.defaults:
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34 setattr(self, key, kw.get(key, self.defaults[key]))
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35 self.auto_reload = self.auto_reload.lower() == 'true'
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36 assert self.tags_file is not None
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37 self.tags = Tags(self.tags_file)
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38 self.patterns = self.patterns.strip().split()
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40 # request handlers
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41 self.handlers = [ TagCloud, ViewTags, PostTags ]
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42
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43 # template loader
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44 self.template_dirs = self.template_dirs.split()
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45 self.template_dirs.append(resource_filename(__name__, 'templates'))
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46 self.loader = TemplateLoader(self.template_dirs,
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47 auto_reload=self.auto_reload)
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48
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49 def __call__(self, environ, start_response):
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50
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51 # get a request object
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52 request = Request(environ)
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53
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54 # get the path
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55 path = request.path_info.strip('/').split('/')
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56 if path == ['']:
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57 path = []
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58 request.environ['path'] = path
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59
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60 # match the request to a handler
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61 for h in self.handlers:
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62 handler = h.match(self, request)
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63 if handler is not None:
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64 break
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65 else:
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66 if self.app:
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67 return self.app(environ, start_response)
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68 handler = exc.HTTPNotFound
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69
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70 # add navigation links to handler [example]
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71 if hasattr(handler, 'data'):
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72 handler.data.setdefault('links', [])
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73 for h in self.handlers:
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74 handler.data['links'].append((handler.link(h.handler_path),
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75 h.__name__))
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76
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77 # get response
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78 res = handler()
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79 return res(environ, start_response)