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from django.core import signals
from django.dispatch import dispatcher
from django import http
import sys
class BaseHandler(object):
def __init__(self):
self._request_middleware = self._view_middleware = self._response_middleware = self._exception_middleware = None
def load_middleware(self):
"""
Populate middleware lists from settings.MIDDLEWARE_CLASSES.
Must be called after the environment is fixed (see __call__).
"""
from django.conf import settings
from django.core import exceptions
self._request_middleware = []
self._view_middleware = []
self._response_middleware = []
self._exception_middleware = []
for middleware_path in settings.MIDDLEWARE_CLASSES:
try:
dot = middleware_path.rindex('.')
except ValueError:
raise exceptions.ImproperlyConfigured, '%s isn\'t a middleware module' % middleware_path
mw_module, mw_classname = middleware_path[:dot], middleware_path[dot+1:]
try:
mod = __import__(mw_module, '', '', [''])
except ImportError, e:
raise exceptions.ImproperlyConfigured, 'Error importing middleware %s: "%s"' % (mw_module, e)
try:
mw_class = getattr(mod, mw_classname)
except AttributeError:
raise exceptions.ImproperlyConfigured, 'Middleware module "%s" does not define a "%s" class' % (mw_module, mw_classname)
try:
mw_instance = mw_class()
except exceptions.MiddlewareNotUsed:
continue
if hasattr(mw_instance, 'process_request'):
self._request_middleware.append(mw_instance.process_request)
if hasattr(mw_instance, 'process_view'):
self._view_middleware.append(mw_instance.process_view)
if hasattr(mw_instance, 'process_response'):
self._response_middleware.insert(0, mw_instance.process_response)
if hasattr(mw_instance, 'process_exception'):
self._exception_middleware.insert(0, mw_instance.process_exception)
def get_response(self, path, request):
"Returns an HttpResponse object for the given HttpRequest"
from django.core import exceptions, urlresolvers
from django.core.mail import mail_admins
from django.conf import settings
# Apply request middleware
for middleware_method in self._request_middleware:
response = middleware_method(request)
if response:
return response
resolver = urlresolvers.RegexURLResolver(r'^/', settings.ROOT_URLCONF)
try:
callback, callback_args, callback_kwargs = resolver.resolve(path)
# Apply view middleware
for middleware_method in self._view_middleware:
response = middleware_method(request, callback, callback_args, callback_kwargs)
if response:
return response
try:
response = callback(request, *callback_args, **callback_kwargs)
except Exception, e:
# If the view raised an exception, run it through exception
# middleware, and if the exception middleware returns a
# response, use that. Otherwise, reraise the exception.
for middleware_method in self._exception_middleware:
response = middleware_method(request, e)
if response:
return response
raise
# Complain if the view returned None (a common error).
if response is None:
raise ValueError, "The view %s.%s didn't return an HttpResponse object." % (callback.__module__, callback.func_name)
return response
except http.Http404, e:
if settings.DEBUG:
return self.get_technical_error_response(request, is404=True, exception=e)
else:
callback, param_dict = resolver.resolve404()
return callback(request, **param_dict)
except exceptions.PermissionDenied:
return http.HttpResponseForbidden('<h1>Permission denied</h1>')
except SystemExit:
pass # See http://code.djangoproject.com/ticket/1023
except: # Handle everything else, including SuspiciousOperation, etc.
if settings.DEBUG:
return self.get_technical_error_response(request)
else:
# Get the exception info now, in case another exception is thrown later.
exc_info = sys.exc_info()
receivers = dispatcher.send(signal=signals.got_request_exception)
# When DEBUG is False, send an error message to the admins.
subject = 'Error (%s IP): %s' % ((request.META.get('REMOTE_ADDR') in settings.INTERNAL_IPS and 'internal' or 'EXTERNAL'), getattr(request, 'path', ''))
try:
request_repr = repr(request)
except:
request_repr = "Request repr() unavailable"
message = "%s\n\n%s" % (self._get_traceback(exc_info), request_repr)
mail_admins(subject, message, fail_silently=True)
return self.get_friendly_error_response(request, resolver)
def get_friendly_error_response(self, request, resolver):
"""
Returns an HttpResponse that displays a PUBLIC error message for a
fundamental error.
"""
callback, param_dict = resolver.resolve500()
return callback(request, **param_dict)
def get_technical_error_response(self, request, is404=False, exception=None):
"""
Returns an HttpResponse that displays a TECHNICAL error message for a
fundamental error.
"""
from django.views import debug
if is404:
return debug.technical_404_response(request, exception)
else:
return debug.technical_500_response(request, *sys.exc_info())
def _get_traceback(self, exc_info=None):
"Helper function to return the traceback as a string"
import traceback
return '\n'.join(traceback.format_exception(*(exc_info or sys.exc_info())))
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