3235: Merge branch 'master' into 3235-top-nav-site-search

[arvados.git] / apps / workbench / app / assets / javascripts / event_log.js

diff --git a/apps/workbench/app/assets/javascripts/event_log.js b/apps/workbench/app/assets/javascripts/event_log.js
index 56e97d711a5b5f15e56956cbb14a6029e60f417d..8bfa1b067252086defb578adefa129c9a31998d0 100644 (file)
--- a/apps/workbench/app/assets/javascripts/event_log.js
+++ b/apps/workbench/app/assets/javascripts/event_log.js
@@ -1,49 +1,54 @@
 /*
- * This file establishes a websockets connection with the API Server.
- *
- * The subscribe method takes a window element id and object id. Any log
- * events for that particular object id are added to that window element.
+ * This js establishes a websockets connection with the API Server.
  */
 
-var event_log_disp;
-
-function subscribeToEventLog (url, uuid, elementId) {
-  // if websockets are not supported by browser, do not attempt to subscribe for events
+/* Subscribe to websockets event log.  Do nothing if already connected. */
+function subscribeToEventLog () {
+  // if websockets are not supported by browser, do not subscribe for events
   websocketsSupported = ('WebSocket' in window);
   if (websocketsSupported == false) {
-    return;  
+    return;
   }
 
-  // create the event log dispatcher
-  event_log_disp = new WebSocket(url);
+  // check if websocket connection is already stored on the window
+  event_log_disp = $(window).data("arv-websocket");
+  if (event_log_disp == null) {
+    // need to create new websocket and event log dispatcher
+    websocket_url = $('meta[name=arv-websocket-url]').attr("content");
+    if (websocket_url == null)
+      return;
 
-  event_log_disp.onopen = function(event) { onEventLogDispatcherOpen(event) };
-  event_log_disp.onmessage = function(event) { onEventLogDispatcherMessage(event) };
+    event_log_disp = new WebSocket(websocket_url);
 
-  // Add the elementId to listener map
-  event_log_listener_map = JSON.parse(sessionStorage.getItem("event_log_listener_map"));
-  if (event_log_listener_map == null)
-    event_log_listener_map = {};
-  delete event_log_listener_map[elementId];
-  event_log_listener_map[elementId] = uuid;
+    event_log_disp.onopen = onEventLogDispatcherOpen;
+    event_log_disp.onmessage = onEventLogDispatcherMessage;
 
-  sessionStorage.removeItem("event_log_listener_map");
-  sessionStorage.setItem("event_log_listener_map", JSON.stringify(event_log_listener_map));
+    // store websocket in window to allow reuse when multiple divs subscribe for events
+    $(window).data("arv-websocket", event_log_disp);
+  }
 }
 
+/* Send subscribe message to the websockets server.  Without any filters
+   arguments, this subscribes to all events */
 function onEventLogDispatcherOpen(event) {
-  event_log_disp.send('{"method":"subscribe"}');
+  this.send('{"method":"subscribe"}');
 }
 
+/* Trigger event for all applicable elements waiting for this event */
 function onEventLogDispatcherMessage(event) {
-  event_log_listener_map = JSON.parse(sessionStorage.getItem("event_log_listener_map"));
+  parsedData = JSON.parse(event.data);
+  object_uuid = parsedData.object_uuid;
 
-  for (var key in event_log_listener_map) {
-    value = event_log_listener_map[key];
+  // if there are any listeners for this object uuid or "all", trigger the event
+  matches = ".arv-log-event-listener[data-object-uuid=\"" + object_uuid + "\"],.arv-log-event-listener[data-object-uuids~=\"" + object_uuid + "\"],.arv-log-event-listener[data-object-uuid=\"all\"],.arv-log-event-listener[data-object-kind=\"" + parsedData.object_kind + "\"]";
+  $(matches).trigger('arv-log-event', event.data);
+}
 
-    eventData = JSON.parse(event.data);
-    if (value === eventData.object_uuid) {
-      $('#'+key).append(eventData.summary + "
");
-    }
+/* Automatically connect if there are any elements on the page that want to
+   received event log events. */
+$(document).on('ajax:complete ready', function() {
+  var a = $('.arv-log-event-listener');
+  if (a.length > 0) {
+    subscribeToEventLog();
   }
-}
+});