Hello Web in Python

This is my simple program originally from slapos.git repository:

    nexedi/slapos@7cd2f953

with all follow-up changes to it in slapos.git tree.

python/helloweb.py

+#!/usr/bin/env python
+"""Simple web-server that says "Hello World" for every path
+
+helloweb [--logfile <logfile>] <bind-ip> <bind-port> ...
+"""
+
+import sys
+import time
+import argparse
+from BaseHTTPServer import BaseHTTPRequestHandler, HTTPServer
+from socket import AF_INET6
+
+
+class WebHello(BaseHTTPRequestHandler):
+
+    def do_GET(self):
+        self.send_response(200) # ok
+        self.send_header("Content-type", "text/plain")
+        self.end_headers()
+
+        print >>self.wfile, \
+            "Hello %s at `%s`  ; %s" % (
+                ' '.join(self.server.webhello_argv) or 'world',
+                self.path, time.asctime())
+
+
+class HTTPServerV6(HTTPServer):
+    address_family = AF_INET6
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--logfile', dest='logfile')
+    parser.add_argument('bind_ip')
+    parser.add_argument('bind_port', type=int)
+    parser.add_argument('argv_extra', metavar='...', nargs=argparse.REMAINDER)
+
+    args = parser.parse_args()
+
+    # HTTPServer logs to sys.stderr - override it if we have --logfile
+    if args.logfile:
+        f = open(args.logfile, 'a', buffering=1)
+        sys.stderr = f
+
+    print >>sys.stderr, '* %s helloweb starting at %s' % (
+        time.asctime(), (args.bind_ip, args.bind_port))
+
+    # TODO autodetect ipv6/ipv4
+    httpd = HTTPServerV6( (args.bind_ip, args.bind_port), WebHello)
+    httpd.webhello_argv = args.argv_extra
+    httpd.serve_forever()
+
+if __name__ == '__main__':
+    main()