forum/views/decorators.py

   1 from django.http import HttpResponse, HttpResponseRedirect, Http404\r
   2 from django.utils import simplejson\r
   3 from django.core.paginator import Paginator, EmptyPage\r
   4 from django.shortcuts import render_to_response\r
   5 from django.template import RequestContext\r
   6 from django.utils.translation import ungettext, ugettext as _\r
   7 import logging\r
   8 \r
   9 def render(template=None, tab=None):\r
  10     def decorator(func):\r
  11         def decorated(request, *args, **kwargs):\r
  12             context = func(request, *args, **kwargs)\r
  13 \r
  14             if tab is not None:\r
  15                 context['tab'] = tab\r
  16 \r
  17             return render_to_response(context.pop('template', template), context,\r
  18                                       context_instance=RequestContext(request))\r
  19 \r
  20         return decorated\r
  21 \r
  22     return decorator\r
  23 \r
  24 def list(paginate, default_page_size):\r
  25     def decorator(func):\r
  26         def decorated(request, *args, **kwargs):\r
  27             context = func(request, *args, **kwargs)\r
  28 \r
  29             pagesize = request.utils.page_size(default_page_size)\r
  30             page = int(request.GET.get('page', 1))\r
  31 \r
  32             big_list = context[paginate]\r
  33             paginator = Paginator(big_list, pagesize)\r
  34 \r
  35             try:\r
  36                 page_obj = paginator.page(page)\r
  37             except EmptyPage:\r
  38                 raise Http404()\r
  39 \r
  40             context[paginate] = page_obj.object_list.lazy()\r
  41 \r
  42             base_path = context.get('base_path', None) or request.path\r
  43             sort = request.utils.sort_method('')\r
  44 \r
  45             context["pagination_context"] = {\r
  46             'is_paginated' : True,\r
  47             'pages': paginator.num_pages,\r
  48             'page': page,\r
  49             'has_previous': page_obj.has_previous(),\r
  50             'has_next': page_obj.has_next(),\r
  51             'previous': page_obj.previous_page_number(),\r
  52             'next': page_obj.next_page_number(),\r
  53             'base_url' : "%s%ssort=%s&" % (base_path, ('?' in base_path) and '&' or '?', sort),\r
  54             'pagesize' : pagesize\r
  55             }\r
  56 \r
  57             context['sort_context'] = {\r
  58             'base_url': "%s%ssort=" % (base_path, ('?' in base_path) and '&' or '?'),\r
  59             'current': sort,\r
  60             }\r
  61 \r
  62             return context\r
  63 \r
  64         return decorated\r
  65 \r
  66     return decorator\r
  67 \r
  68 \r
  69 class CommandException(Exception):\r
  70     pass\r
  71 \r
  72 class RefreshPageCommand(HttpResponse):\r
  73     def __init__(self):\r
  74         super(RefreshPageCommand, self).__init__(\r
  75                 content=simplejson.dumps({'commands': {'refresh_page': []}, 'success': True}),\r
  76                 mimetype="application/json")\r
  77 \r
  78 def command(func):\r
  79     def decorated(request, *args, **kwargs):\r
  80         try:\r
  81             response = func(request, *args, **kwargs)\r
  82 \r
  83             if isinstance(response, HttpResponse):\r
  84                 return response\r
  85 \r
  86             response['success'] = True\r
  87         except Exception, e:\r
  88             import traceback\r
  89             #traceback.print_exc()\r
  90 \r
  91             if isinstance(e, CommandException):\r
  92                 response = {\r
  93                 'success': False,\r
  94                 'error_message': e.message\r
  95                 }\r
  96             else:\r
  97                 logging.error("%s: %s" % (func.__name__, str(e)))\r
  98                 logging.error(traceback.format_exc())\r
  99                 response = {\r
 100                 'success': False,\r
 101                 'error_message': _("We're sorry, but an unknown error ocurred.<br />Please try again in a while.")\r
 102                 }\r
 103 \r
 104         if request.is_ajax():\r
 105             return HttpResponse(simplejson.dumps(response), mimetype="application/json")\r
 106         else:\r
 107             return HttpResponseRedirect(request.META.get('HTTP_REFERER', '/'))\r
 108 \r
 109     return decorated