[#2293] [WebUI] Fix plugins not loading when using WebUI plugin

- Any plugins that were started before the WebUI plugin would not be loaded
   upon starting the web server and would be not show up. The fix is to use
   web.pluginmanager.start to get all enabled plugins from core.
 - Update log message output for enable/disable in pluginmanager.
 - Deregister plugin events on json_api disable.

deluge/ui/web/json_api.py

@@ -150,13 +150,21 @@ class JSON(resource.Resource, component.Component):
         return d.addCallback(on_client_connected)
 
     def disable(self):
-        if not client.is_classicmode():
+        client.deregister_event_handler("PluginEnabledEvent", self.get_remote_methods)
+        client.deregister_event_handler("PluginDisabledEvent", self.get_remote_methods)
+
+        if client.is_classicmode():
+            component.get("Web.PluginManager").stop()
+        else:
             client.disconnect()
 
     def enable(self):
         client.register_event_handler("PluginEnabledEvent", self.get_remote_methods)
         client.register_event_handler("PluginDisabledEvent", self.get_remote_methods)
-        if component.get("DelugeWeb").config["default_daemon"]:
+
+        if client.is_classicmode():
+            component.get("Web.PluginManager").start()
+        elif component.get("DelugeWeb").config["default_daemon"]:
             # Sort out getting the default daemon here
             default = component.get("DelugeWeb").config["default_daemon"]
             host = component.get("Web").get_host(default)

deluge/ui/web/pluginmanager.py

@@ -83,7 +83,7 @@ class PluginManager(PluginManagerBase, component.Component):
         try:
             plugin = component.get("WebPlugin." + name)
         except KeyError:
-            log.info("Plugin has no web ui")
+            log.debug("'%s' plugin contains no WebUI code, ignoring WebUI disable call.", name)
             return
 
         info = gather_info(plugin)
@@ -105,7 +105,7 @@ class PluginManager(PluginManagerBase, component.Component):
         try:
             plugin = component.get("WebPlugin." + name)
         except KeyError:
-            log.info("Plugin has no web ui")
+            log.info("'%s' plugin contains no WebUI code, ignoring WebUI enable call.", name)
             return
 
         info = gather_info(plugin)