17.6.2 asynchat Example
The following partial example shows how HTTP requests can be read with async_chat. A web server might create an http_request_handler object for each incoming client connection. Notice that initially the channel terminator is set to match the blank line at the end of the HTTP headers, and a flag indicates that the headers are being read.
Once the headers have been read, if the request is of type POST
(indicating that further data are present in the input stream) then the
Content-Length: header is used to set a numeric terminator to
read the right amount of data from the channel.
The handle_request() method is called once all relevant input
has been marshalled, after setting the channel terminator to None
to ensure that any extraneous data sent by the web client are ignored.
class http_request_handler(asynchat.async_chat):
def __init__(self, conn, addr, sessions, log):
asynchat.async_chat.__init__(self, conn=conn)
self.addr = addr
self.sessions = sessions
self.ibuffer = []
self.obuffer = ""
self.set_terminator("\r\n\r\n")
self.reading_headers = True
self.handling = False
self.cgi_data = None
self.log = log
def collect_incoming_data(self, data):
"""Buffer the data"""
self.ibuffer.append(data)
def found_terminator(self):
if self.reading_headers:
self.reading_headers = False
self.parse_headers("".join(self.ibuffer))
self.ibuffer = []
if self.op.upper() == "POST":
clen = self.headers.getheader("content-length")
self.set_terminator(int(clen))
else:
self.handling = True
self.set_terminator(None)
self.handle_request()
elif not self.handling:
self.set_terminator(None) # browsers sometimes over-send
self.cgi_data = parse(self.headers, "".join(self.ibuffer))
self.handling = True
self.ibuffer = []
self.handle_request()
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Release 2.5, documentation updated on 19th September, 2006.