157 lines
7.7 KiB
Python
157 lines
7.7 KiB
Python
from django.utils import httpwrappers
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class BaseHandler:
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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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def load_middleware(self):
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"""
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Populate middleware lists from settings.MIDDLEWARE_CLASSES.
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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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dot = middleware_path.rindex('.')
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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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try:
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mw_instance = mw_class()
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except exceptions.MiddlewareNotUsed:
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continue
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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, path, request):
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"Returns an HttpResponse object for the given HttpRequest"
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from django.core import db, exceptions, urlresolvers
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from django.core.mail import mail_admins
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from django.conf.settings import DEBUG, INTERNAL_IPS, ROOT_URLCONF
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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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resolver = urlresolvers.RegexURLResolver(r'^/', ROOT_URLCONF)
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try:
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callback, param_dict = resolver.resolve(path)
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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, param_dict)
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if response:
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return response
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try:
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response = callback(request, **param_dict)
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except Exception, e:
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# If the view raised an exception, run it through exception
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# middleware, and if the exception middleware returns a
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# response, use that. Otherwise, reraise the exception.
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for middleware_method in self._exception_middleware:
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response = middleware_method(request, e)
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if response:
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return response
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raise
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# Complain if the view returned None (a common error).
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if response is None:
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raise ValueError, "The view %s.%s didn't return an HttpResponse object." % (callback.__module__, callback.func_name)
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return response
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except exceptions.Http404, e:
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if DEBUG:
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return self.get_technical_error_response(is404=True, exception=e)
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else:
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callback, param_dict = resolver.resolve404()
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return callback(request, **param_dict)
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except db.DatabaseError:
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db.db.rollback()
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if DEBUG:
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return self.get_technical_error_response()
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else:
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subject = 'Database error (%s IP): %s' % ((request.META.get('REMOTE_ADDR') in INTERNAL_IPS and 'internal' or 'EXTERNAL'), getattr(request, 'path', ''))
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message = "%s\n\n%s" % (self._get_traceback(), request)
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mail_admins(subject, message, fail_silently=True)
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return self.get_friendly_error_response(request, resolver)
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except exceptions.PermissionDenied:
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return httpwrappers.HttpResponseForbidden('<h1>Permission denied</h1>')
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except: # Handle everything else, including SuspiciousOperation, etc.
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if DEBUG:
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return self.get_technical_error_response()
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else:
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subject = 'Coding error (%s IP): %s' % ((request.META.get('REMOTE_ADDR') in INTERNAL_IPS and 'internal' or 'EXTERNAL'), getattr(request, 'path', ''))
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try:
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request_repr = repr(request)
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except:
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request_repr = "Request repr() unavailable"
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message = "%s\n\n%s" % (self._get_traceback(), request_repr)
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mail_admins(subject, message, fail_silently=True)
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return self.get_friendly_error_response(request, resolver)
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def get_friendly_error_response(self, request, resolver):
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"""
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Returns an HttpResponse that displays a PUBLIC error message for a
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fundamental database or coding error.
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"""
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from django.core import urlresolvers
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callback, param_dict = resolver.resolve500()
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return callback(request, **param_dict)
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def get_technical_error_response(self, is404=False, exception=None):
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"""
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Returns an HttpResponse that displays a TECHNICAL error message for a
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fundamental database or coding error.
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"""
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if is404:
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from django.conf.settings import ROOT_URLCONF
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from django.utils.html import escape
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html = ['<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">']
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html.append('<html><head><title>Error 404</title>')
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# Explicitly tell robots not to archive this, in case this slips
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# onto a production site.
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html.append('<meta name="robots" content="NONE,NOARCHIVE" />')
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html.append('</head><body><h1>Error 404</h1>')
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try:
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tried = exception.args[0]['tried']
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except (IndexError, TypeError):
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if exception.args:
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html.append('<p>%s</p>' % escape(exception.args[0]))
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else:
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html.append('<p>Using the URLconf defined in <code>%s</code>, Django tried these URL patterns, in this order:</p>' % ROOT_URLCONF)
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html.append('<ul>%s</ul>' % ''.join(['<li><code>%s</code></li>' % escape(t).replace(' ', ' ') for t in tried]))
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html.append("<p>The current URL, <code><strong>%r</strong></code>, didn't match any of these.</p>" % exception.args[0]['path'])
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html.append("<hr /><p>You're seeing this error because you have <code>DEBUG = True</code> in your Django settings file. Change that to <code>False</code>, and Django will display a standard 404 page.</p>")
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html.append('</body></html>')
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return httpwrappers.HttpResponseNotFound('\n'.join(html))
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else:
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output = "There's been an error:\n\n%s" % self._get_traceback()
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return httpwrappers.HttpResponseServerError(output, mimetype='text/plain')
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def _get_traceback(self):
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"Helper function to return the traceback as a string"
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import sys, traceback
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return '\n'.join(traceback.format_exception(*sys.exc_info()))
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