May 2001
Intermediate to advanced
304 pages
6h 12m
English
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The asynchat Module
The asynchat module is an extension to asyncore. It
provides additional support for line-oriented protocols. It also
provides improved buffering support, via the push
methods and the “producer” mechanism.
Example 7-12 implements a very minimal HTTP responder. It simply returns an HTML document containing information from an HTTP request (the output appears in the browser window).
Example 7-12. Using the asynchat Module to Implement a Minimal HTTP Server
File: asynchat-example-1.py import asyncore, asynchat import os, socket, string PORT = 8000 class HTTPChannel(asynchat.async_chat): def _ _init_ _(self, server, sock, addr): asynchat.async_chat._ _init_ _(self, sock) self.set_terminator("\r\n") self.request = None self.data = "" self.shutdown = 0 def collect_incoming_data(self, data): self.data = self.data + data def found_terminator(self): if not self.request: # got the request line self.request = string.split(self.data, None, 2) if len(self.request) != 3: self.shutdown = 1 else: self.push("HTTP/1.0 200 OK\r\n") self.push("Content-type: text/html\r\n") self.push("\r\n") self.data = self.data + "\r\n" self.set_terminator("\r\n\r\n") # look for end of headers else: # return payload. self.push("<html><body><pre>\r\n") self.push(self.data) self.push("</pre></body></html>\r\n") self.close_when_done() class HTTPServer(asyncore.dispatcher): def _ _init_ _(self, port): self.create_socket(socket.AF_INET, socket.SOCK_STREAM) self.bind(("", port)) self.listen(5) def handle_accept(self): ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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