ModPythonJson.py

   1 #
   2 # Apache mod_python interface for JSON requests
   3 #
   4 # Aaron Klingaman <alk@absarokasoft.com>
   5 # Mark Huang <mlhuang@cs.princeton.edu>
   6 #
   7 # Copyright (C) 2004-2006 The Trustees of Princeton University
   8 # $Id$
   9 # $URL$
  10 #
  11
  12 import sys
  13 import traceback
  14 import xmlrpclib
  15 from mod_python import apache
  16
  17 from PLC.Debug import log
  18
  19 from PLC.API import PLCAPI
  20 api = PLCAPI()
  21
  22 def handler(req):
  23     try:
  24         if req.method != "POST":
  25             req.content_type = "text/html"
  26             req.send_http_header()
  27             req.write("""
  28 <html><head>
  29 <title>PLCAPI JSON Interface</title>
  30 </head><body>
  31 <h1>PLCAPI JSON Interface</h1>
  32 <p>Please POST JSON to access the PLCAPI.</p>
  33 </body></html>
  34 """)
  35             return apache.OK
  36
  37         # Read request
  38         request = req.read(int(req.headers_in['content-length']))
  39
  40         # mod_python < 3.2: The IP address portion of remote_addr is
  41         # incorrect (always 0.0.0.0) when IPv6 is enabled.
  42         # http://issues.apache.org/jira/browse/MODPYTHON-64?page=all
  43         (remote_ip, remote_port) = req.connection.remote_addr
  44         remote_addr = (req.connection.remote_ip, remote_port)
  45
  46         # Handle request
  47         response = api.handle_json(remote_addr, request)
  48
  49         # Shut down database connection, otherwise up to MaxClients DB
  50         # connections will remain open.
  51         api.db.close()
  52
  53         # Write response
  54         req.content_type = "text/json; charset=" + api.encoding
  55         req.send_http_header()
  56         req.write(response)
  57
  58         return apache.OK
  59
  60     except Exception, err:
  61         # Log error in /var/log/httpd/(ssl_)?error_log
  62         print >> log, err, traceback.format_exc()
  63         return apache.HTTP_INTERNAL_SERVER_ERROR