def mongrel2_handler(application, conn, debug=False): """ Based on : https://github.com/berry/Mongrel2-WSGI-Handler/blob/master/wsgi-handler.py WSGI handler based on the Python wsgiref SimpleHandler. A WSGI application should return a iterable op StringTypes. Any encoding must be handled by the WSGI application itself. """ from wsgiref.handlers import SimpleHandler try: import cStringIO as StringIO except: import StringIO # TODO - this wsgi handler executes the application and renders a page # in memory completely before returning it as a response to the client. # Thus, it does not "stream" the result back to the client. It should be # possible though. The SimpleHandler accepts file-like stream objects. So, # it should be just a matter of connecting 0MQ requests/response streams to # the SimpleHandler requests and response streams. However, the Python API # for Mongrel2 doesn't seem to support file-like stream objects for requests # and responses. Unless I have missed something. while True: if debug: print "WAITING FOR REQUEST" # receive a request req = conn.recv() if debug: print "REQUEST BODY: %r\n" % req.body if req.is_disconnect(): if debug: print "DISCONNECT" continue # effectively ignore the disconnect from the client # Set a couple of environment attributes a.k.a. header attributes # that are a must according to PEP 333 environ = req.headers environ[ 'SERVER_PROTOCOL'] = 'HTTP/1.1' # SimpleHandler expects a server_protocol, lets assume it is HTTP 1.1 environ['REQUEST_METHOD'] = environ['METHOD'] if ':' in environ['Host']: environ['SERVER_NAME'] = environ['Host'].split(':')[0] environ['SERVER_PORT'] = environ['Host'].split(':')[1] else: environ['SERVER_NAME'] = environ['Host'] environ['SERVER_PORT'] = '' environ['SCRIPT_NAME'] = '' # empty for now environ['PATH_INFO'] = urllib.unquote(environ['PATH']) if '?' in environ['URI']: environ['QUERY_STRING'] = environ['URI'].split('?')[1] else: environ['QUERY_STRING'] = '' if 'Content-Length' in environ: environ['CONTENT_LENGTH'] = environ[ 'Content-Length'] # necessary for POST to work with Django environ['wsgi.input'] = req.body if debug: print "ENVIRON: %r\n" % environ # SimpleHandler needs file-like stream objects for # requests, errors and responses reqIO = StringIO.StringIO(req.body) errIO = StringIO.StringIO() respIO = StringIO.StringIO() # execute the application handler = SimpleHandler(reqIO, respIO, errIO, environ, multithread=False, multiprocess=False) handler.run(application) # Get the response and filter out the response (=data) itself, # the response headers, # the response status code and the response status description response = respIO.getvalue() response = response.split("\r\n") data = response[-1] headers = dict([r.split(": ") for r in response[1:-2]]) code = response[0][9:12] status = response[0][13:] # strip BOM's from response data # Especially the WSGI handler from Django seems to generate them (2 actually, huh?) # a BOM isn't really necessary and cause HTML parsing errors in Chrome and Safari # See also: http://www.xs4all.nl/~mechiel/projects/bomstrip/ # Although I still find this a ugly hack, it does work. data = data.replace('\xef\xbb\xbf', '') # Get the generated errors errors = errIO.getvalue() # return the response if debug: print "RESPONSE: %r\n" % response if errors: if debug: print "ERRORS: %r" % errors data = "%s\r\n\r\n%s" % (data, errors) conn.reply_http(req, data, code=code, status=status, headers=headers)
def mongrel2_handler(application, conn, debug=False): """ Based on : https://github.com/berry/Mongrel2-WSGI-Handler/blob/master/wsgi-handler.py WSGI handler based on the Python wsgiref SimpleHandler. A WSGI application should return a iterable op StringTypes. Any encoding must be handled by the WSGI application itself. """ from wsgiref.handlers import SimpleHandler try: import cStringIO as StringIO except: import StringIO # TODO - this wsgi handler executes the application and renders a page # in memory completely before returning it as a response to the client. # Thus, it does not "stream" the result back to the client. It should be # possible though. The SimpleHandler accepts file-like stream objects. So, # it should be just a matter of connecting 0MQ requests/response streams to # the SimpleHandler requests and response streams. However, the Python API # for Mongrel2 doesn't seem to support file-like stream objects for requests # and responses. Unless I have missed something. while True: if debug: print("WAITING FOR REQUEST") # receive a request req = conn.recv() if debug: print("REQUEST BODY: %r\n" % req.body) if req.is_disconnect(): if debug: print("DISCONNECT") continue # effectively ignore the disconnect from the client # Set a couple of environment attributes a.k.a. header attributes # that are a must according to PEP 333 environ = req.headers environ['SERVER_PROTOCOL'] = 'HTTP/1.1' # SimpleHandler expects a server_protocol, lets assume it is HTTP 1.1 environ['REQUEST_METHOD'] = environ['METHOD'] if ':' in environ['Host']: environ['SERVER_NAME'] = environ['Host'].split(':')[0] environ['SERVER_PORT'] = environ['Host'].split(':')[1] else: environ['SERVER_NAME'] = environ['Host'] environ['SERVER_PORT'] = '' environ['SCRIPT_NAME'] = '' # empty for now environ['PATH_INFO'] = urllib.unquote(environ['PATH']) if '?' in environ['URI']: environ['QUERY_STRING'] = environ['URI'].split('?')[1] else: environ['QUERY_STRING'] = '' if 'Content-Length' in environ: environ['CONTENT_LENGTH'] = environ[ 'Content-Length'] # necessary for POST to work with Django environ['wsgi.input'] = req.body if debug: print("ENVIRON: %r\n" % environ) # SimpleHandler needs file-like stream objects for # requests, errors and responses reqIO = StringIO.StringIO(req.body) errIO = StringIO.StringIO() respIO = StringIO.StringIO() # execute the application handler = SimpleHandler(reqIO, respIO, errIO, environ, multithread=False, multiprocess=False) handler.run(application) # Get the response and filter out the response (=data) itself, # the response headers, # the response status code and the response status description response = respIO.getvalue() response = response.split("\r\n") data = response[-1] headers = dict([r.split(": ") for r in response[1:-2]]) code = response[0][9:12] status = response[0][13:] # strip BOM's from response data # Especially the WSGI handler from Django seems to generate them (2 actually, huh?) # a BOM isn't really necessary and cause HTML parsing errors in Chrome and Safari # See also: http://www.xs4all.nl/~mechiel/projects/bomstrip/ # Although I still find this a ugly hack, it does work. data = data.replace('\xef\xbb\xbf', '') # Get the generated errors errors = errIO.getvalue() # return the response if debug: print("RESPONSE: %r\n" % response) if errors: if debug: print("ERRORS: %r" % errors) data = "%s\r\n\r\n%s" % (data, errors) conn.reply_http( req, data, code=code, status=status, headers=headers)