[IMP] wsgi: (proof of concept) serving xml-rpc requests behind gunicorn:

> gunicorn openerp:wsgi.application -c gunicorn.conf.py
If you want to try, you should know an addons_path is
hard coded in openerp.wsgi.on_starting().

bzr revid: vmt@openerp.com-20110819130248-tf81ttu42t2uhkuo

gunicorn.conf.py

@@ -0,0 +1,7 @@
+import openerp
+# Standard OpenERP XML-RPC port.
+bind = '127.0.0.1:8069'
+# Some application-wide initialization is needed.
+on_starting = openerp.wsgi.on_starting
+# This is the big TODO: safely use more than a single worker.
+workers = 1

openerp/__init__.py

@@ -41,6 +41,7 @@ import tiny_socket
 import tools
 import wizard
 import workflow
+import wsgi
 
 # vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
 

openerp/wsgi.py

@@ -0,0 +1,86 @@
+# -*- coding: utf-8 -*-
+##############################################################################
+#
+#    OpenERP, Open Source Management Solution
+#    Copyright (C) 2011 OpenERP s.a. (<http://openerp.com>).
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU Affero General Public License as
+#    published by the Free Software Foundation, either version 3 of the
+#    License, or (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU Affero General Public License for more details.
+#
+#    You should have received a copy of the GNU Affero General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+##############################################################################
+
+""" WSGI stuffs (proof of concept for now)
+
+This module offers an WSGI interface to OpenERP.
+
+"""
+
+from wsgiref.simple_server import make_server
+from SimpleXMLRPCServer import SimpleXMLRPCDispatcher
+import xmlrpclib
+
+import sys
+
+import openerp
+import openerp.tools.config as config
+
+def wsgi_xmlrpc(environ, start_response):
+    if environ['REQUEST_METHOD'] == 'POST' and environ['PATH_INFO'].startswith('/xmlrpc/'):
+        length = int(environ['CONTENT_LENGTH'])
+        data = environ['wsgi.input'].read(length)
+        path = environ['PATH_INFO'][len('/xmlrpc/'):] # expected to be one of db, object, ... TODO should we expect a possible trailing '/' ?
+
+        # TODO see SimpleXMLRPCDispatcher._marshaled_dispatch() for some necessary handling.
+        # TODO see OpenERPDispatcher for some othe handling (in particular, auth things).
+        params, method = xmlrpclib.loads(data)
+        result = openerp.netsvc.ExportService.getService(path).dispatch(method, None, params)
+        response = xmlrpclib.dumps((result,), methodresponse=1, allow_none=False, encoding=None)
+
+        start_response("200 OK", [('Content-Type','text/xml'), ('Content-Length', str(len(response)))])
+        return [response]
+
+def wsgi_jsonrpc(environ, start_response):
+    pass
+
+def application(environ, start_response):
+
+    # Try all handlers until one returns some result (i.e. not None).
+    wsgi_handlers = [wsgi_xmlrpc, wsgi_jsonrpc]
+    for handler in wsgi_handlers:
+        result = handler(environ, start_response)
+        if result is None:
+            continue
+        return result
+
+    # We never returned from the loop.
+    else:
+        response = 'No handler found.\n'
+        start_response('200 OK', [('Content-Type', 'text/plain'), ('Content-Length', str(len(response)))])
+        return [response]
+
+# Serve XMLRPC via wsgiref's simple_server.
+# Blocking, should probably be called in its own process.
+def serve():
+    httpd = make_server('localhost', config['xmlrpc_port'], application)
+    httpd.serve_forever()
+
+# Application setup be fore we can spawn any worker process.
+# This is suitable for e.g. gunicorn's on_starting hook.
+def on_starting(server):
+    config = openerp.tools.config
+    config['addons_path'] = '/home/openerp/repos/addons/trunk/' # need a config file
+    openerp.netsvc.init_logger()
+    openerp.osv.osv.start_object_proxy()
+    openerp.service.web_services.start_web_services()
+
+# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4: