Add configurable stuff for the standalone server

Now listening address, listening port and max_children count can be configured using the Settings module

lodel/plugins/multisite/confspecs.py

     'lodel2': {
         'debug': (True, SettingValidator('bool'))
     },
+    'lodel2.server': {
+        'listen_address': ('', SettingValidator('dummy')),
+        #'listen_address': ('', SettingValidator('ip')), #<-- not implemented
+        'listen_port': ( 1337, SettingValidator('int')),
+        'max_children': (40, SettingValidator('int')),
+    },
     'lodel2.logging.*' : {
         'level': (  'ERROR',
                     SettingValidator('loglevel')),

lodel/plugins/multisite/example_lodel2.ini

+[lodel2.logging.templog]
+level = INFO
+filename = /tmp/log
+context = True
+
+[lodel2.server]
+listen_address = 
+listen_port = 1337
+max_children = 100
+
+[lodel2.logging.stderr]
+level = WARNING
+filename = -
+context = True
+
+
+[lodel2.datasources.default]
+identifier = dummy_datasource.default
+
+[lodel2.datasource.dummy_datasource.default]
+dummy = dummy

lodel/plugins/multisite/main.py

 from lodel.context import LodelContext
 from lodel.context import ContextError
 
-##@brief On wich addr we want to bind. '' mean all interfaces
-LISTEN_ADDR = ''
-##@brief Listening socket port
-LISTEN_PORT = 1337
-
 ##@brief Set the poll interval to detect shutdown requests (do not work)
 SHUTDOWN_POLL_INTERVAL = 0.1 # <-- No impact because of ForkingTCPServer bug
 
 #in a child process
 class ForkingWSGIServer(
         wsgiref.simple_server.WSGIServer, socketserver.ForkingTCPServer):
+    
+    ##@brief static property indicating the max number of childs allowed
+    max_children = 40
+
     ##@brief Custom reimplementation of shutdown method in order to ensure
     #that we close all listening sockets
     #
 
 ##@brief Starts the server until a SIGINT is received
 def main_loop():
-    #Init app cache
-    listen_addr = LISTEN_ADDR
-    listen_port = LISTEN_PORT
+    LodelContext.expose_modules(globals(), {'lodel.settings': ['Settings']})
+    ForkingWSGIServer.max_children = Settings.server.max_children
+    listen_addr = Settings.server.listen_address
+    listen_port = Settings.server.listen_port
     server = wsgiref.simple_server.make_server(
         listen_addr, listen_port, wsgi_router,
         server_class=ForkingWSGIServer, handler_class = LodelWSGIHandler)

lodel/settings/validator.py

 # Class instance are callable objects that takes a value argument (the value to validate). It raises
 # a SettingsValidationError if validation fails, else it returns a properly
 # casted value.
+#@todo implement an IP validator and use it in multisite confspec
 class SettingValidator(object):
     
     _validators = dict()