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# Copyright (c) 2005, 2006 Allan Saddi <allan@saddi.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
"""
ajp - an AJP 1.3/WSGI gateway.
For more information about AJP and AJP connectors for your web server, see
<http://jakarta.apache.org/tomcat/connectors-doc/>.
For more information about the Web Server Gateway Interface, see
<http://www.python.org/peps/pep-0333.html>.
Example usage:
#!/usr/bin/env python
import sys
from myapplication import app # Assume app is your WSGI application object
from ajp import WSGIServer
ret = WSGIServer(app).run()
sys.exit(ret and 42 or 0)
See the documentation for WSGIServer for more information.
About the bit of logic at the end:
Upon receiving SIGHUP, the python script will exit with status code 42. This
can be used by a wrapper script to determine if the python script should be
re-run. When a SIGINT or SIGTERM is received, the script exits with status
code 0, possibly indicating a normal exit.
Example wrapper script:
#!/bin/sh
STATUS=42
while test $STATUS -eq 42; do
python "$@" that_script_above.py
STATUS=$?
done
Example workers.properties (for mod_jk):
worker.list=foo
worker.foo.port=8009
worker.foo.host=localhost
worker.foo.type=ajp13
Example httpd.conf (for mod_jk):
JkWorkersFile /path/to/workers.properties
JkMount /* foo
Note that if you mount your ajp application anywhere but the root ("/"), you
SHOULD specifiy scriptName to the WSGIServer constructor. This will ensure
that SCRIPT_NAME/PATH_INFO are correctly deduced.
"""
__author__ = 'Allan Saddi <allan@saddi.com>'
__version__ = '$Revision$'
import socket
import logging
from ajp_base import BaseAJPServer, Connection
from preforkserver import PreforkServer
__all__ = ['WSGIServer']
class WSGIServer(BaseAJPServer, PreforkServer):
"""
AJP1.3/WSGI server. Runs your WSGI application as a persistant program
that understands AJP1.3. Opens up a TCP socket, binds it, and then
waits for forwarded requests from your webserver.
Why AJP? Two good reasons are that AJP provides load-balancing and
fail-over support. Personally, I just wanted something new to
implement. :)
Of course you will need an AJP1.3 connector for your webserver (e.g.
mod_jk) - see <http://jakarta.apache.org/tomcat/connectors-doc/>.
"""
def __init__(self, application, scriptName='', environ=None,
bindAddress=('localhost', 8009), allowedServers=None,
loggingLevel=logging.INFO, debug=True, **kw):
"""
scriptName is the initial portion of the URL path that "belongs"
to your application. It is used to determine PATH_INFO (which doesn't
seem to be passed in). An empty scriptName means your application
is mounted at the root of your virtual host.
environ, which must be a dictionary, can contain any additional
environment variables you want to pass to your application.
bindAddress is the address to bind to, which must be a tuple of
length 2. The first element is a string, which is the host name
or IPv4 address of a local interface. The 2nd element is the port
number.
allowedServers must be None or a list of strings representing the
IPv4 addresses of servers allowed to connect. None means accept
connections from anywhere.
loggingLevel sets the logging level of the module-level logger.
"""
BaseAJPServer.__init__(self, application,
scriptName=scriptName,
environ=environ,
multithreaded=False,
multiprocess=True,
bindAddress=bindAddress,
allowedServers=allowedServers,
loggingLevel=loggingLevel,
debug=debug)
for key in ('multithreaded', 'multiprocess', 'jobClass', 'jobArgs'):
if kw.has_key(key):
del kw[key]
PreforkServer.__init__(self, jobClass=Connection, jobArgs=(self,), **kw)
def run(self):
"""
Main loop. Call this after instantiating WSGIServer. SIGHUP, SIGINT,
SIGQUIT, SIGTERM cause it to cleanup and return. (If a SIGHUP
is caught, this method returns True. Returns False otherwise.)
"""
self.logger.info('%s starting up', self.__class__.__name__)
try:
sock = self._setupSocket()
except socket.error, e:
self.logger.error('Failed to bind socket (%s), exiting', e[1])
return False
ret = PreforkServer.run(self, sock)
self._cleanupSocket(sock)
self.logger.info('%s shutting down%s', self.__class__.__name__,
self._hupReceived and ' (reload requested)' or '')
return ret
def factory(global_conf, host=None, port=None, **local):
import paste_factory
return paste_factory.helper(WSGIServer, global_conf, host, port, **local)
if __name__ == '__main__':
def test_app(environ, start_response):
"""Probably not the most efficient example."""
import cgi
start_response('200 OK', [('Content-Type', 'text/html')])
yield '<html><head><title>Hello World!</title></head>\n' \
'<body>\n' \
'<p>Hello World!</p>\n' \
'<table border="1">'
names = environ.keys()
names.sort()
for name in names:
yield '<tr><td>%s</td><td>%s</td></tr>\n' % (
name, cgi.escape(`environ[name]`))
form = cgi.FieldStorage(fp=environ['wsgi.input'], environ=environ,
keep_blank_values=1)
if form.list:
yield '<tr><th colspan="2">Form data</th></tr>'
for field in form.list:
yield '<tr><td>%s</td><td>%s</td></tr>\n' % (
field.name, field.value)
yield '</table>\n' \
'</body></html>\n'
# Explicitly set bindAddress to *:8009 for testing.
WSGIServer(test_app,
bindAddress=('', 8009), allowedServers=None,
loggingLevel=logging.DEBUG).run()
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