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# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org) # Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php """ WSGI middleware Captures any exceptions and prints a pretty report. See the `cgitb documentation <http://python.org/doc/current/lib/module-cgitb.html>`_ for more. """ import cgitb from cStringIO import StringIO import sys from paste.util import converters class NoDefault(object): pass class CgitbMiddleware(object): def __init__(self, app, global_conf=None, display=NoDefault, logdir=None, context=5, format="html"): self.app = app if global_conf is None: global_conf = {} if display is NoDefault: display = global_conf.get('debug') if isinstance(display, basestring): display = converters.asbool(display) self.display = display self.logdir = logdir self.context = int(context) self.format = format def __call__(self, environ, start_response): try: app_iter = self.app(environ, start_response) return self.catching_iter(app_iter, environ) except: exc_info = sys.exc_info() start_response('500 Internal Server Error', [('content-type', 'text/html')], exc_info) response = self.exception_handler(exc_info, environ) return [response] def catching_iter(self, app_iter, environ): if not app_iter: raise StopIteration error_on_close = False try: for v in app_iter: yield v if hasattr(app_iter, 'close'): error_on_close = True app_iter.close() except: response = self.exception_handler(sys.exc_info(), environ) if not error_on_close and hasattr(app_iter, 'close'): try: app_iter.close() except: close_response = self.exception_handler( sys.exc_info(), environ) response += ( '<hr noshade>Error in .close():<br>%s' % close_response) yield response def exception_handler(self, exc_info, environ): dummy_file = StringIO() hook = cgitb.Hook(file=dummy_file, display=self.display, logdir=self.logdir, context=self.context, format=self.format) hook(*exc_info) return dummy_file.getvalue() def make_cgitb_middleware(app, global_conf, display=NoDefault, logdir=None, context=5, format='html'): """ Wraps the application in the ``cgitb`` (standard library) error catcher. display: If true (or debug is set in the global configuration) then the traceback will be displayed in the browser logdir: Writes logs of all errors in that directory context: Number of lines of context to show around each line of source code """ from paste.deploy.converters import asbool if display is not NoDefault: display = asbool(display) if 'debug' in global_conf: global_conf['debug'] = asbool(global_conf['debug']) return CgitbMiddleware( app, global_conf=global_conf, display=display, logdir=logdir, context=context, format=format)