In the correlations page, show the date of the last correlation analysis run.

Fixes #23.
2016-09-24 18:06:48 +01:00 · 2016-09-24 18:06:48 +01:00 · ce14b928de
--- a/correlations.html
+++ b/correlations.html
@ -9,6 +9,7 @@
 <body>
 <script src="correlations.js" type="text/javascript"></script>
 <script src="correlations_page.js" type="text/javascript"></script>
+<span id="date" style="font-size: xx-small;"></span>
 <select name="channel" id="channel">
  <option selected>release</option>
  <option>beta</option>
--- a/correlations.js
+++ b/correlations.js
@ -25,25 +25,30 @@ var correlations = (() => {
    return hexCodes.join('');
  }

-  function loadCorrelationData(signature, channel) {
-    let loadChannelsData;
+  function loadChannelsData() {
    if (correlationData) {
-      loadChannelsData = Promise.resolve();
-    } else {
-      loadChannelsData = fetch('https://analysis-output.telemetry.mozilla.org/top-signatures-correlations/data/all.json.gz')
-      .then(response => response.json())
-      .then(totals => {
-          correlationData = {};
-          for (let ch of Object.keys(totals)) {
-            correlationData[ch] = {
-              'total': totals[ch],
-              'signatures': {},
-            }
-          }
-      });
+      return Promise.resolve();
    }

-    return loadChannelsData
+    return fetch('https://analysis-output.telemetry.mozilla.org/top-signatures-correlations/data/all.json.gz')
+    .then(response => response.json())
+    .then(totals => {
+        console.log(totals);
+        correlationData = {
+          'date': totals['date'],
+        };
+
+        for (let ch of ['release', 'beta', 'aurora', 'nightly']) {
+          correlationData[ch] = {
+            'total': totals[ch],
+            'signatures': {},
+          }
+        }
+    });
+  }
+
+  function loadCorrelationData(signature, channel) {
+    return loadChannelsData()
    .then(() => {
      if (signature in correlationData[channel]['signatures']) {
        return;
@ -60,6 +65,11 @@ var correlations = (() => {
    .then(() => correlationData);
  }

+  function getAnalysisDate() {
+    return loadChannelsData()
+    .then(() => correlationData['date']);
+  }
+
  function itemToLabel(item) {
    return Object.getOwnPropertyNames(item)
    .map(key => key + ' = ' + item[key])
@ -235,6 +245,7 @@ var correlations = (() => {
  }

  return {
+    getAnalysisDate: getAnalysisDate,
    text: text,
    graph: graph,
  };
--- a/correlations_page.js
+++ b/correlations_page.js
@ -45,6 +45,10 @@ function getCorrelations() {
 }

 onLoad
+.then(function() {
+  correlations.getAnalysisDate()
+  .then(date => document.getElementById('date').textContent = date)
+})
 .then(function() {
  let queryVars = new URL(location.href).search.substring(1).split('&');