FEATURE: Live-update site settings

app/assets/javascripts/discourse/initializers/message-bus.js.es6

@@ -7,7 +7,9 @@ export default {
     // We don't use the message bus in testing
     if (Discourse.testing) { return; }
 
-    const messageBus = container.lookup('message-bus:main');
+    const messageBus = container.lookup('message-bus:main'),
+      user = container.lookup('current-user:main'),
+      siteSettings = container.lookup('site-settings:main');
 
     const deprecatedBus = {};
     deprecatedBus.prototype = messageBus;
@@ -20,5 +22,25 @@ export default {
     messageBus.alwaysLongPoll = Discourse.Environment === "development";
     messageBus.start();
     Discourse.KeyValueStore.init("discourse_", messageBus);
+
+    messageBus.callbackInterval = siteSettings.anon_polling_interval;
+    messageBus.backgroundCallbackInterval = siteSettings.background_polling_interval;
+    messageBus.baseUrl = siteSettings.long_polling_base_url;
+
+    if (messageBus.baseUrl !== '/') {
+      // zepto compatible, 1 param only
+      messageBus.ajax = function(opts) {
+        opts.headers = opts.headers || {};
+        opts.headers['X-Shared-Session-Key'] = $('meta[name=shared_session_key]').attr('content');
+        return $.ajax(opts);
+      };
+    } else {
+      messageBus.baseUrl = Discourse.getURL('/');
+    }
+
+    if (user) {
+      messageBus.callbackInterval = siteSettings.polling_interval;
+      messageBus.enableLongPolling = true;
+    }
   }
 };

app/assets/javascripts/discourse/initializers/subscribe-user-notifications.js.es6

@@ -10,24 +10,7 @@ export default {
           siteSettings = container.lookup('site-settings:main'),
           bus = container.lookup('message-bus:main');
 
-    bus.callbackInterval = siteSettings.anon_polling_interval;
-    bus.backgroundCallbackInterval = siteSettings.background_polling_interval;
-    bus.baseUrl = siteSettings.long_polling_base_url;
-
-    if (bus.baseUrl !== '/') {
-      // zepto compatible, 1 param only
-      bus.ajax = function(opts) {
-        opts.headers = opts.headers || {};
-        opts.headers['X-Shared-Session-Key'] = $('meta[name=shared_session_key]').attr('content');
-        return $.ajax(opts);
-      };
-    } else {
-      bus.baseUrl = Discourse.getURL('/');
-    }
-
     if (user) {
-      bus.callbackInterval = siteSettings.polling_interval;
-      bus.enableLongPolling = true;
 
       if (user.get('staff')) {
         bus.subscribe('/flagged_counts', (data) => {
@@ -58,7 +41,7 @@ export default {
       }, user.notification_channel_position);
 
       bus.subscribe("/categories", function(data) {
-        _.each(data.categories,function(c) {
+        _.each(data.categories, function(c) {
           site.updateCategory(c);
         });
         _.each(data.deleted_categories,function(id) {
@@ -66,6 +49,10 @@ export default {
         });
       });
 
+      bus.subscribe("/client_settings", function(data) {
+        siteSettings[data.name] = data.value;
+      });
+
       if (!Ember.testing) {
         initDesktopNotifications(bus);
       }

lib/site_setting_extension.rb

@@ -65,6 +65,10 @@ module SiteSettingExtension
     @refresh_settings ||= []
   end
 
+  def client_settings
+    @client_settings ||= []
+  end
+
   def previews
     @previews ||= {}
   end
@@ -136,12 +140,7 @@ module SiteSettingExtension
   # just like a setting, except that it is available in javascript via DiscourseSession
   def client_setting(name, default = nil, opts = {})
     setting(name, default, opts)
-    @client_settings ||= []
-    @client_settings << name
-  end
-
-  def client_settings
-    @client_settings ||= []
+    client_settings << name
   end
 
   def settings_hash
@@ -312,6 +311,7 @@ module SiteSettingExtension
 
     provider.save(name, val, type)
     current[name] = convert(val, type)
+    notify_clients!(name) if client_settings.include? name
     clear_cache!
   end
 
@@ -319,6 +319,10 @@ module SiteSettingExtension
     MessageBus.publish('/site_settings', {process: process_id})
   end
 
+  def notify_clients!(name)
+    MessageBus.publish('/client_settings', {name: name, value: self.send(name)})
+  end
+
   def has_setting?(name)
     defaults.has_key?(name.to_sym) || defaults.has_key?("#{name}?".to_sym)
   end