#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# http://www.apache.org/licenses/LICENSE-2.0
#
import sys
from google.appengine.ext.webapp import Request
from google.appengine.ext.webapp import Response
class WSGIApplication(object):
"""Wraps a set of webapp RequestHandlers in a WSGI-compatible application.
This is based on webapp's WSGIApplication by Google, but uses Routes library
(http://routes.groovie.org/) to match url's.
"""
def __init__(self, mapper, debug = False):
"""Initializes this application with the given URL mapping.
Args:
mapper: a routes.mapper.Mapper instance
debug: if true, we send Python stack traces to the browser on errors
"""
self.mapper = mapper
self.__debug = debug
WSGIApplication.active_instance = self
self.current_request_args = ()
def __call__(self, environ, start_response):
"""Called by WSGI when a request comes in."""
request = Request(environ)
response = Response()
WSGIApplication.active_instance = self
# Match the path against registered routes.
kargs = self.mapper.match(request.path)
if kargs is None:
raise TypeError('No routes match. Provide a fallback to avoid this.')
# Extract the module and controller names from the route.
try:
module_name, class_name = kargs['controller'].split(':', 1)
del kargs['controller']
except:
raise TypeError('Controller is not set, or not formatted in the form "my.module.name:MyControllerName".')
# Initialize matched controller from given module.
try:
__import__(module_name)
module = sys.modules[module_name]
controller = getattr(module, class_name)()
controller.initialize(request, response)
except:
raise ImportError('Controller %s from module %s could not be initialized.' % (class_name, module_name))
# Use the action set in the route, or the HTTP method.
if 'action' in kargs:
action = kargs['action']
del kargs['action']
else:
action = environ['REQUEST_METHOD'].lower()
if action not in ['get', 'post', 'head', 'options', 'put', 'delete', 'trace']:
action = None
if controller and action:
try:
# Execute the requested action, passing the route dictionary as
# named parameters.
getattr(controller, action)(**kargs)
except Exception, e:
controller.handle_exception(e, self.__debug)
response.wsgi_write(start_response)
return ['']
else:
response.set_status(404)
