Save promises of API calls.

luckytyphlosion · Aug 2, 2020 · a675d98 · a675d98
1 parent ea337d9
commit a675d98
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Showing 2 changed files with 14 additions and 2 deletions.
diff --git a/index.html b/index.html
@@ -10,6 +10,5 @@
   </head>
   <body>
     <table id="mcceQueue"></table>
-    <pre></pre>
   </body>
 </html>
diff --git a/main.js b/main.js
@@ -13,6 +13,8 @@ var runData = null;
 var categoryData = null;
 var variableData = null;
 
+var apiCallSavedPromises = new Map();
+
 // Taken and modified from https://stackoverflow.com/a/29153059
 var srcIso8601DurationRegex = /PT(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)(?:\.(\d+))?S)?/;
 
@@ -30,8 +32,16 @@ function parseSrcISO8601Duration(srcIso8601Duration)
 
 function srcApiGetFromUrlAwait(urlStr)
 {
+    console.log(`Starting ${urlStr} at ${performance.now()}.`);
+
+    let savedPromise = apiCallSavedPromises.get(urlStr);
+    if (savedPromise !== undefined) {
+        console.log(`${urlStr}: using saved result`);
+        return savedPromise;
+    }
+
     let timeStart = performance.now();
-    return new Promise(function (resolve, reject) {
+    let promise = new Promise(function (resolve, reject) {
         let xmlHttp = new XMLHttpRequest();
         xmlHttp.open("GET", urlStr, true);
         xmlHttp.onload = function () {
@@ -55,6 +65,9 @@ function srcApiGetFromUrlAwait(urlStr)
         };
         xmlHttp.send();
     });
+
+    apiCallSavedPromises.set(urlStr, promise);
+    return promise;
 }
 
 function srcApiGetAwait(endpoint)
-Original file line number
+Diff line change
@@ Expand Up / @@ -10,6 +10,5 @@ @@
       </head>
       <body>
         <table id="mcceQueue"></table>
-        <pre></pre>
       </body>
     </html>