[FIX] avoid systematically deadlocking the stand-alone OpenERP web in its default configuration

The default configuration for OpenERP Web standalone (launched via the
openerp-web script) is single-threaded for log-readability purposes.

web.common.controllers.main.Proxy.load has been added to wrap a
request to an HTTP handler inside a JSON (and/or JSONP) request, the
initial implementation was to perform a full HTTP call *from within an
HTTP handler to itself*.

Since the server is single-threaded and its only thread is already
busy, it can't handle the new request, and the client deadlocks.

Replaced this crap by also-crap-but-slightly-less-so: instantiating a
Werkzeug test client using the root application and proxying the
request through that. Avoids creating a new request from the server,
therefore does not deadlock.

lp bug: https://launchpad.net/bugs/905384 fixed

bzr revid: xmo@openerp.com-20111219145759-m10zgo3tcd6zjhcu

addons/web/common/http.py

@@ -441,6 +441,7 @@ class Root(object):
         """
         request = werkzeug.wrappers.Request(environ)
         request.parameter_storage_class = werkzeug.datastructures.ImmutableDict
+        request.app = self
 
         if request.path == '/':
             params = urllib.urlencode(request.args)

addons/web/controllers/main.py

@@ -248,15 +248,19 @@ class Proxy(openerpweb.Controller):
 
     @openerpweb.jsonrequest
     def load(self, req, path):
-        #req.config.socket_port
-        #if not re.match('^/[^/]+/static/.*', path):
-        #    return werkzeug.exceptions.BadRequest()
+        """ Proxies an HTTP request through a JSON request.
 
-        env = req.httprequest.environ
-        port = env['SERVER_PORT']
+        It is strongly recommended to not request binary files through this,
+        as the result will be a binary data blob as well.
 
-        o = urllib2.urlopen('http://127.0.0.1:%s%s' % (port, path))
-        return o.read()
+        :param req: OpenERP request
+        :param path: actual request path
+        :return: file content
+        """
+        from werkzeug.test import Client
+        from werkzeug.wrappers import BaseResponse
+
+        return Client(req.httprequest.app, BaseResponse).get(path).data
 
 class Database(openerpweb.Controller):
     _cp_path = "/web/database"