Remove the rest of iron-ajax from bot-list-data

appengine/swarming/elements/res/imp/botlist/bot-list-data.html

 <!--
   Copyright 2016 The LUCI Authors. All rights reserved.
   Use of this source code is governed under the Apache License, Version 2.0
   that can be found in the LICENSE file.
 
   This in an HTML Import-able file that contains the definition
   of the following elements:
 
     <bot-list-data>
 
@@ skipping 42 matching lines @@
         This is dimensions, then bot properties, then elements from bot.state.
 
   Methods:
     signIn(): Force a signin of the user using OAuth.  This happens
         automatically when auth_headers is set.
 
   Events:
     None.
 -->
 
-<link rel="import" href="/res/imp/bower_components/iron-ajax/iron-ajax.html">
-
 <link rel="import" href="bot-list-shared-behavior.html">
 
 <dom-module id="bot-list-data">
-  <template>
-    <iron-ajax id="botlist"
-       url="/_ah/api/swarming/v1/bots/list"
-       headers="[[auth_headers]]"
-       params="[[query_params]]"
-       handle-as="json"
-       last-response="{{_list}}"
-       loading="{{_busy1}}">
-    </iron-ajax>
 
-    <iron-ajax id="dimensions"
-       url="/_ah/api/swarming/v1/bots/dimensions"
-       headers="[[auth_headers]]"
-       handle-as="json"
-       last-response="{{_dimensions}}"
-       loading="{{_busy2}}">
-    </iron-ajax>
-
-    <iron-ajax id="fleet"
-       url="/_ah/api/swarming/v1/bots/count"
-       headers="[[auth_headers]]"
-       handle-as="json"
-       last-response="{{_count}}"
-       loading="{{_busy3}}">
-    </iron-ajax>
-  </template>
   <script>
   (function(){
     var BLACKLIST_DIMENSIONS = ["quarantined", "error"];
 
     Polymer({
       is: 'bot-list-data',
 
       behaviors: [
           SwarmingBehaviors.BotListBehavior,
       ],
 
       properties: {
         // inputs
         auth_headers: {
           type: Object,
           observer: "signIn",
         },
         query_params: {
           type: Object,
+          observer: "_request",
         },
 
         //outputs
         bots: {
           type: Array,
           computed: "_bots(_list)",
           notify: true,
         },
         busy: {
           type: Boolean,
@@ skipping 16 matching lines @@
           notify: true,
         },
         primary_arr: {
           type: Array,
           //BOT_PROPERTIES is inherited from BotListBehavior
           computed: "_primaryArr(dimensions, BOT_PROPERTIES)",
           notify: true,
         },
 
         // private
+         _busy1: {
+          type: Boolean,
+          value: false
+        },
+        _busy2: {
+          type: Boolean,
+          value: false
+        },
+        _busy3: {
+          type: Boolean,
+          value: false
+        },
         _count: {
           type: Object,
         },
         _dimensions: {
           type: Object,
         },
         _list: {
           type: Object,
         },
       },
 
       signIn: function(){
-        // Auto on iron-ajax means to automatically re-make the request if
-        // the url or the query params change.  Auto does not trigger if the
-        // [auth] headers change, so we wait until the user is signed in
-        // before making any requests.
-        this.$.botlist.auto = true;
-        this.$.dimensions.auto = true;
-        this.$.fleet.auto = true;
+        this._getJsonAsync("_count", "/_ah/api/swarming/v1/bots/count",
+          "_busy2", this.auth_headers);
+        this._getJsonAsync("_dimensions","/_ah/api/swarming/v1/bots/dimensions",
+          "_busy3", this.auth_headers);
+
+        this._request();
       },
 
       _bots: function(){
         if (!this._list || !this._list.items) {
           return [];
         }
         // Do any preprocessing here
         this._list.items.forEach(function(bot){
           // Parse the state, which is a JSON string.  This contains a lot of
           // interesting information like details about the devices attached.
@@ skipping 100 matching lines @@
         // Create custom filter options
         pMap["disk_space"] = [];
         pMap["task"] = ["busy", "idle"];
         pMap["status"] = ["alive", "dead", "quarantined"];
 
         // No need to sort any of this, bot-filters sorts secondary items
         // automatically, especially when the user types a query.
         return pMap;
       },
 
+      _request: function() {
+        // wait until the user has logged in and the filters have loaded before requesting this to avoid double or even triple requests.
+        if (!this.auth_headers || !this.query_params) {
+          return;
+        }
+        this._getJsonAsync("_list", "/_ah/api/swarming/v1/bots/list",
+          "_busy1", this.auth_headers, this.query_params);
+      },
+
     });
   })();
   </script>
 </dom-module>