Log if SSE is enabled/disabled.

pybossa/core.py

@@ -63,6 +63,7 @@ def create_app(run_as_server=True):
     setup_debug_toolbar(app)
     setup_jinja2_filters(app)
     setup_newsletter(app)
+    setup_sse(app)
     plugin_manager.init_app(app)
     plugin_manager.install_plugins()
     import pybossa.model.event_listeners
@@ -90,6 +91,15 @@ def configure_app(app):
             dict(slave=app.config.get('SQLALCHEMY_DATABASE_URI'))
 
 
+def setup_sse(app):
+    if app.config['SSE']:
+        msg = "WARNING: async mode is required as Server Sent Events are enabled."
+        app.logger.warning(msg)
+    else:
+        msg = "INFO: async mode is disabled."
+        app.logger.info(msg)
+
+
 def setup_theme(app):
     """Configure theme for PyBossa app."""
     theme = app.config['THEME']

pybossa/default_settings.py

@@ -111,3 +111,6 @@
 
 # Send emails weekly update every
 WEEKLY_UPDATE_STATS = 'Sunday'
+
+# Enable Server Sent Events
+SSE = False

settings_local.py.tmpl

@@ -160,3 +160,9 @@ ACCOUNT_CONFIRMATION_DISABLED = True
 
 # Send emails weekly update every
 # WEEKLY_UPDATE_STATS = 'Sunday'
+
+# Enable Server Sent Events
+# WARNING: this will require to run PyBossa in async mode. Check the docs.
+# WARNING: if you don't enable async when serving PyBossa, the server will lock
+# WARNING: and it will not work. For this reason, it's disabled by default.
+# SSE = False