Mercurial > hg > commentator
annotate commentator/middleware.py @ 3:d0d8524d9495
finish basic API...still doesnt expire results correctly
| author | k0s <k0scist@gmail.com> |
|---|---|
| date | Fri, 26 Feb 2010 11:06:48 -0500 |
| parents | 689b9d928dc8 |
| children | 451169e51935 |
| rev | line source |
|---|---|
| 0 | 1 """ |
| 2 request dispatcher: | |
| 3 data persisting across requests should go here | |
| 4 """ | |
| 5 | |
| 6 import os | |
| 7 import re | |
| 8 | |
| 9 from handlers import PostComment | |
|
2
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
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10 #from model import CouchComments |
|
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
11 from model import PickleComments |
| 0 | 12 from genshi.template import TemplateLoader |
| 13 from lxml import etree | |
| 14 from lxmlmiddleware import LXMLMiddleware | |
| 15 from paste.fileapp import FileApp | |
| 16 from pkg_resources import resource_filename | |
| 17 from string import Template | |
| 18 from webob import Request, Response, exc | |
| 19 | |
| 20 class LaxTemplate(Template): | |
| 21 idpattern = r'[_a-z0-9]+' | |
| 22 | |
| 23 class Commentator(LXMLMiddleware): | |
| 24 | |
| 25 ### class level variables | |
| 26 defaults = { 'auto_reload': 'False', | |
| 27 'database': 'commentator', | |
|
2
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
28 'date_format': '%H:%M %m/%d/%Y', |
| 0 | 29 'template_dirs': '', |
| 30 'pattern': '.*', | |
| 31 'path': 'html', | |
| 32 'url': '.comment', | |
| 33 'template': 'comment.html' } | |
| 34 | |
| 35 def __init__(self, app, **kw): | |
| 36 | |
| 37 self.app = app | |
| 38 | |
| 39 # set instance parameters from kw and defaults | |
| 40 for key in self.defaults: | |
| 41 setattr(self, key, kw.get(key, self.defaults[key])) | |
| 42 self.auto_reload = self.auto_reload.lower() == 'true' | |
| 43 | |
| 44 # request handlers | |
| 45 self.handlers = [ PostComment ] | |
| 46 | |
| 47 # template loader | |
| 48 self.template_dirs = self.template_dirs.split() | |
| 49 self.template_dirs.append(resource_filename(__name__, 'templates')) | |
| 50 self.loader = TemplateLoader(self.template_dirs, | |
| 51 auto_reload=self.auto_reload) | |
| 52 | |
| 53 # URL,path | |
| 54 assert '#' in self.pattern | |
| 55 self.url_pattern, self.xpath_pattern = self.pattern.split('#', 1) | |
| 56 assert '->' in self.xpath_pattern | |
| 57 self.xpath_pattern, self.mapping = [i.strip() for i in self.xpath_pattern.split('->')] | |
| 58 | |
| 59 # string template for URL substitution | |
| 60 self.mapping = LaxTemplate(self.mapping) | |
| 61 | |
| 62 # backend: comment storage | |
| 63 self.model = PickleComments(self.database) | |
| 64 | |
| 65 def __call__(self, environ, start_response): | |
| 66 | |
| 67 # get a request object | |
| 68 request = Request(environ) | |
| 69 | |
| 70 # get the path | |
| 71 path = request.path_info.strip('/').split('/') | |
| 72 if path == ['']: | |
| 73 path = [] | |
| 74 request.environ['path'] = path | |
| 75 | |
| 76 # save the path; not sure why i need to do this | |
| 77 environ['commentator.path_info'] = request.path_info | |
| 78 | |
| 79 # match the request to a handler | |
| 80 for h in self.handlers: | |
| 81 handler = h.match(self, request) | |
| 82 if handler is not None: | |
| 83 break | |
| 84 else: | |
| 85 return LXMLMiddleware.__call__(self, environ, start_response) | |
| 86 | |
| 87 # get response | |
| 88 res = handler() | |
| 89 return res(environ, start_response) | |
| 90 | |
|
2
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
91 def manipulate(self, request, response, tree): |
|
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
92 url_match = re.match(self.url_pattern, request.environ['commentator.path_info']) |
| 0 | 93 if not url_match: |
| 94 return tree | |
| 95 | |
| 96 # make string template of the groups | |
| 97 groups_dict = dict([(str(index+1), value) | |
| 98 for index, value in enumerate(url_match.groups())]) | |
| 99 | |
|
3
d0d8524d9495
finish basic API...still doesnt expire results correctly
k0s <k0scist@gmail.com>
parents:
2
diff
changeset
|
100 last_modified = None |
| 0 | 101 for element in tree.findall(self.xpath_pattern): |
| 102 | |
| 103 # get url | |
| 104 str_dict = groups_dict.copy() | |
| 105 for key in element.keys(): | |
| 106 str_dict[key] = element.get(key) | |
| 107 uri = self.mapping.substitute(str_dict) | |
| 108 | |
| 109 # genshi data | |
| 110 data = {} | |
| 111 data['comments'] = self.model.comments(uri) | |
|
3
d0d8524d9495
finish basic API...still doesnt expire results correctly
k0s <k0scist@gmail.com>
parents:
2
diff
changeset
|
112 if data['comments']: |
|
d0d8524d9495
finish basic API...still doesnt expire results correctly
k0s <k0scist@gmail.com>
parents:
2
diff
changeset
|
113 last_modified = data['comments'][-1]['date'] |
| 0 | 114 data['action'] = '%s/%s' % (uri, self.url) |
|
2
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
115 data['date_format'] = self.date_format |
|
689b9d928dc8
add date, reflect api change of lxmlmiddleware
k0s <k0scist@gmail.com>
parents:
0
diff
changeset
|
116 data['request'] = request |
| 0 | 117 |
| 118 # render template | |
| 119 template = self.loader.load(self.template) | |
| 120 comments = template.generate(**data).render() | |
| 121 comments = etree.fromstring(comments) | |
| 122 element.append(comments) | |
| 123 | |
|
3
d0d8524d9495
finish basic API...still doesnt expire results correctly
k0s <k0scist@gmail.com>
parents:
2
diff
changeset
|
124 if last_modified: |
|
d0d8524d9495
finish basic API...still doesnt expire results correctly
k0s <k0scist@gmail.com>
parents:
2
diff
changeset
|
125 import pdb; pdb.set_trace() |
| 0 | 126 return tree |