def __call__(self, env, callback):
""" Called to execute the request """
uri = env['PATH_INFO']
try:
handler, args = self.find_route(uri)
h = handler(self, env)
ret = h.execute(*args)
status = util.code_to_status(h.status)
callback(status, h.headers)
return iter(ret)
## if a request is made via a method we have not implemented
## a request handler for, an AttributeError with be raised
## a 405 Method Not ALlowed status might work here, but for
## now we will just send a 404 status
except AttributeError:
traceback.print_exc(file=env['wsgi.errors'])
handler = ErrorRequestHandler(self, env, status=404)
status = util.code_to_status(handler.status)
callback(status, handler.headers)
return iter(handler.execute())
## if an HTTPError was thrown, send down an error page
## based on the thrown HTTP status code
except HTTPError, e:
traceback.print_exc(file=env['wsgi.errors'])
handler = ErrorRequestHandler(self, env, status=e.status)
status = util.code_to_status(handler.status)
callback(status, handler.headers)
return iter(handler.execute())
def execute(self):
return util.code_to_status(self.status)
return iter(handler.execute())
## if an HTTPError was thrown, send down an error page
## based on the thrown HTTP status code
except HTTPError, e:
traceback.print_exc(file=env['wsgi.errors'])
handler = ErrorRequestHandler(self, env, status=e.status)
status = util.code_to_status(handler.status)
callback(status, handler.headers)
return iter(handler.execute())
## return a 500 Internal Server Error page if any
## other exceptions have been thrown. We will also send
## a traceback for further investigation of the error
except:
traceback.print_exc(file=env['wsgi.errors'])
handler = ErrorRequestHandler(self, env, status=500)
status = util.code_to_status(handler.status)
callback(status, handler.headers)
return iter(handler.execute())
class ErrorRequestHandler(RequestHandler):
""" Generate error pages based on HTTP status codes
When supplied with an HTTP status code (most likely from a thrown
HTTPError), generate an error page with a short status message,
taken from httplib.responses for the specified status code
Attributes:
application -- Instance of WebApplication from which we were called
env -- WSGI environment dict
status -- HTTP status code
"""
