author | Sverre Rabbelier <srabbelier@gmail.com> |
Sun, 15 Mar 2009 13:36:14 +0000 | |
changeset 1865 | f00720cddea0 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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1 |
import sys |
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2 |
|
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from django import http |
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from django.core import signals |
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from django.utils.encoding import force_unicode |
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|
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class BaseHandler(object): |
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8 |
# Changes that are always applied to a response (in this order). |
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response_fixes = [ |
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http.fix_location_header, |
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http.conditional_content_removal, |
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http.fix_IE_for_attach, |
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http.fix_IE_for_vary, |
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14 |
] |
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def __init__(self): |
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self._request_middleware = self._view_middleware = self._response_middleware = self._exception_middleware = None |
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18 |
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def load_middleware(self): |
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""" |
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Populate middleware lists from settings.MIDDLEWARE_CLASSES. |
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22 |
|
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Must be called after the environment is fixed (see __call__). |
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""" |
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from django.conf import settings |
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from django.core import exceptions |
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self._request_middleware = [] |
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self._view_middleware = [] |
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self._response_middleware = [] |
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self._exception_middleware = [] |
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for middleware_path in settings.MIDDLEWARE_CLASSES: |
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try: |
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dot = middleware_path.rindex('.') |
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except ValueError: |
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raise exceptions.ImproperlyConfigured, '%s isn\'t a middleware module' % middleware_path |
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mw_module, mw_classname = middleware_path[:dot], middleware_path[dot+1:] |
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try: |
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mod = __import__(mw_module, {}, {}, ['']) |
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except ImportError, e: |
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raise exceptions.ImproperlyConfigured, 'Error importing middleware %s: "%s"' % (mw_module, e) |
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try: |
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mw_class = getattr(mod, mw_classname) |
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except AttributeError: |
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raise exceptions.ImproperlyConfigured, 'Middleware module "%s" does not define a "%s" class' % (mw_module, mw_classname) |
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|
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try: |
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mw_instance = mw_class() |
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48 |
except exceptions.MiddlewareNotUsed: |
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49 |
continue |
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|
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if hasattr(mw_instance, 'process_request'): |
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self._request_middleware.append(mw_instance.process_request) |
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if hasattr(mw_instance, 'process_view'): |
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self._view_middleware.append(mw_instance.process_view) |
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if hasattr(mw_instance, 'process_response'): |
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self._response_middleware.insert(0, mw_instance.process_response) |
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if hasattr(mw_instance, 'process_exception'): |
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self._exception_middleware.insert(0, mw_instance.process_exception) |
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def get_response(self, request): |
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"Returns an HttpResponse object for the given HttpRequest" |
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from django.core import exceptions, urlresolvers |
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from django.conf import settings |
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|
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# Apply request middleware |
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for middleware_method in self._request_middleware: |
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response = middleware_method(request) |
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if response: |
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return response |
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# Get urlconf from request object, if available. Otherwise use default. |
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urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF) |
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|
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resolver = urlresolvers.RegexURLResolver(r'^/', urlconf) |
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try: |
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callback, callback_args, callback_kwargs = resolver.resolve( |
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request.path_info) |
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|
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# Apply view middleware |
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for middleware_method in self._view_middleware: |
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response = middleware_method(request, callback, callback_args, callback_kwargs) |
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if response: |
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83 |
return response |
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84 |
|
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85 |
try: |
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86 |
response = callback(request, *callback_args, **callback_kwargs) |
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except Exception, e: |
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88 |
# If the view raised an exception, run it through exception |
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89 |
# middleware, and if the exception middleware returns a |
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90 |
# response, use that. Otherwise, reraise the exception. |
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for middleware_method in self._exception_middleware: |
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92 |
response = middleware_method(request, e) |
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93 |
if response: |
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94 |
return response |
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95 |
raise |
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96 |
|
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97 |
# Complain if the view returned None (a common error). |
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98 |
if response is None: |
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99 |
try: |
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100 |
view_name = callback.func_name # If it's a function |
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101 |
except AttributeError: |
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102 |
view_name = callback.__class__.__name__ + '.__call__' # If it's a class |
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103 |
raise ValueError, "The view %s.%s didn't return an HttpResponse object." % (callback.__module__, view_name) |
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104 |
|
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105 |
return response |
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106 |
except http.Http404, e: |
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107 |
if settings.DEBUG: |
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108 |
from django.views import debug |
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109 |
return debug.technical_404_response(request, e) |
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110 |
else: |
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111 |
try: |
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112 |
callback, param_dict = resolver.resolve404() |
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113 |
return callback(request, **param_dict) |
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114 |
except: |
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115 |
try: |
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116 |
return self.handle_uncaught_exception(request, resolver, sys.exc_info()) |
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117 |
finally: |
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118 |
receivers = signals.got_request_exception.send(sender=self.__class__, request=request) |
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119 |
except exceptions.PermissionDenied: |
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120 |
return http.HttpResponseForbidden('<h1>Permission denied</h1>') |
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121 |
except SystemExit: |
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122 |
# Allow sys.exit() to actually exit. See tickets #1023 and #4701 |
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123 |
raise |
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124 |
except: # Handle everything else, including SuspiciousOperation, etc. |
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125 |
# Get the exception info now, in case another exception is thrown later. |
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126 |
exc_info = sys.exc_info() |
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127 |
receivers = signals.got_request_exception.send(sender=self.__class__, request=request) |
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128 |
return self.handle_uncaught_exception(request, resolver, exc_info) |
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129 |
|
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130 |
def handle_uncaught_exception(self, request, resolver, exc_info): |
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131 |
""" |
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132 |
Processing for any otherwise uncaught exceptions (those that will |
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133 |
generate HTTP 500 responses). Can be overridden by subclasses who want |
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134 |
customised 500 handling. |
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135 |
|
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136 |
Be *very* careful when overriding this because the error could be |
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137 |
caused by anything, so assuming something like the database is always |
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138 |
available would be an error. |
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139 |
""" |
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140 |
from django.conf import settings |
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141 |
from django.core.mail import mail_admins |
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142 |
|
323
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143 |
if settings.DEBUG_PROPAGATE_EXCEPTIONS: |
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144 |
raise |
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145 |
|
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146 |
if settings.DEBUG: |
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147 |
from django.views import debug |
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148 |
return debug.technical_500_response(request, *exc_info) |
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|
149 |
|
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150 |
# When DEBUG is False, send an error message to the admins. |
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|
151 |
subject = 'Error (%s IP): %s' % ((request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS and 'internal' or 'EXTERNAL'), request.path) |
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|
152 |
try: |
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|
153 |
request_repr = repr(request) |
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|
154 |
except: |
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|
155 |
request_repr = "Request repr() unavailable" |
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|
156 |
message = "%s\n\n%s" % (self._get_traceback(exc_info), request_repr) |
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|
157 |
mail_admins(subject, message, fail_silently=True) |
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|
158 |
# Return an HttpResponse that displays a friendly error message. |
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|
159 |
callback, param_dict = resolver.resolve500() |
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|
160 |
return callback(request, **param_dict) |
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|
161 |
|
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162 |
def _get_traceback(self, exc_info=None): |
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163 |
"Helper function to return the traceback as a string" |
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|
164 |
import traceback |
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165 |
return '\n'.join(traceback.format_exception(*(exc_info or sys.exc_info()))) |
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|
166 |
|
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|
167 |
def apply_response_fixes(self, request, response): |
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|
168 |
""" |
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|
169 |
Applies each of the functions in self.response_fixes to the request and |
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|
170 |
response, modifying the response in the process. Returns the new |
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|
171 |
response. |
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|
172 |
""" |
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|
173 |
for func in self.response_fixes: |
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|
174 |
response = func(request, response) |
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|
175 |
return response |
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|
176 |
|
323
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|
177 |
def get_script_name(environ): |
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|
178 |
""" |
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|
179 |
Returns the equivalent of the HTTP request's SCRIPT_NAME environment |
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|
180 |
variable. If Apache mod_rewrite has been used, returns what would have been |
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|
181 |
the script name prior to any rewriting (so it's the script name as seen |
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Load ../vendor/django into trunk/app/django.
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|
182 |
from the client's perspective), unless DJANGO_USE_POST_REWRITE is set (to |
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Load ../vendor/django into trunk/app/django.
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|
183 |
anything). |
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|
184 |
""" |
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|
185 |
from django.conf import settings |
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|
186 |
if settings.FORCE_SCRIPT_NAME is not None: |
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|
187 |
return force_unicode(settings.FORCE_SCRIPT_NAME) |
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|
188 |
|
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|
189 |
# If Apache's mod_rewrite had a whack at the URL, Apache set either |
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|
190 |
# SCRIPT_URL or REDIRECT_URL to the full resource URL before applying any |
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|
191 |
# rewrites. Unfortunately not every webserver (lighttpd!) passes this |
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changeset
|
192 |
# information through all the time, so FORCE_SCRIPT_NAME, above, is still |
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|
193 |
# needed. |
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|
194 |
script_url = environ.get('SCRIPT_URL', u'') |
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Load ../vendor/django into trunk/app/django.
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|
195 |
if not script_url: |
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|
196 |
script_url = environ.get('REDIRECT_URL', u'') |
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Load ../vendor/django into trunk/app/django.
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|
197 |
if script_url: |
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Load ../vendor/django into trunk/app/django.
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|
198 |
return force_unicode(script_url[:-len(environ.get('PATH_INFO', ''))]) |
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Load ../vendor/django into trunk/app/django.
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|
199 |
return force_unicode(environ.get('SCRIPT_NAME', u'')) |
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Load ../vendor/django into trunk/app/django.
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changeset
|
200 |