From 422a7911e82c206a31112517948eca3ec4453a44 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C4=93teris=20Caune?= <cuu508@gmail.com>
Date: Mon, 26 Feb 2018 01:36:59 +0200
Subject: [PATCH] Auto-refresh check statuses every 3s while user is active,
 and every 60s afterwards.

---
 static/js/checks.js                    | 48 ++++++++++++++++++++++++--
 templates/front/my_checks_desktop.html |  2 +-
 2 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/static/js/checks.js b/static/js/checks.js
index 2d4822ec..1817242f 100644
--- a/static/js/checks.js
+++ b/static/js/checks.js
@@ -261,8 +261,10 @@ $(function () {
     function refresh() {
         $.getJSON("/checks/status/", function(data) {
             for(var i=0, el; el=data.details[i]; i++) {
-                $("#check-desktop-" + el.code + " .indicator-cell span").attr("class", "status icon-" + el.status);
-                $("#check-desktop-" + el.code + " .last-ping-cell").html(el.last_ping);
+                var elId = "#check-desktop-" + el.code;
+                $(elId + " .indicator-cell span").attr("class", "status icon-" + el.status);
+                $(elId + " .last-ping-cell").html(el.last_ping);
+                $(elId + " .li-pause-check").toggleClass("disabled", el.status == "paused");
             }
 
             $("#my-checks-tags button").each(function(a) {
@@ -274,6 +276,48 @@ $(function () {
         });
     }
 
+    // unconditionally refresh every minute
+    setInterval(refresh, 60000);
+
+    // scheduleRefresh() keeps calling refresh() and decreasing quota
+    // every 3 seconds, until quota runs out.
+    var quota = 0;
+    var scheduledId = null;
+    function scheduleRefresh() {
+        if (quota > 0) {
+            quota -= 1;
+            clearTimeout(scheduledId);
+            scheduledId = setTimeout(scheduleRefresh, 3000);
+            refresh();
+        }
+    }
+
+    document.addEventListener("visibilitychange", function() {
+        if (document.visibilityState == "visible") {
+            // tab becomes visible: reset quota
+            if (quota == 0) {
+                quota = 20;
+                scheduleRefresh();
+            } else {
+                quota = 20;
+            }
+        } else {
+            // lost visibility, clear quota
+            quota = 0;
+        }
+    });
+
+    // user moves mouse: reset quota
+    document.addEventListener("mousemove", function() {
+        if (quota == 0) {
+            quota = 20;
+            scheduleRefresh();
+        } else {
+            quota = 20;
+
+        }
+    });
+
     // Copy to clipboard
     var clipboard = new Clipboard('button.copy-link');
     $("button.copy-link").mouseout(function(e) {
diff --git a/templates/front/my_checks_desktop.html b/templates/front/my_checks_desktop.html
index 1ab35a09..ce279073 100644
--- a/templates/front/my_checks_desktop.html
+++ b/templates/front/my_checks_desktop.html
@@ -86,7 +86,7 @@
                 <span class="icon-settings" aria-hidden="true"></span>
                 </button>
                 <ul class="dropdown-menu">
-                    <li {% if check.status == "new" or check.status == "paused" %}class="disabled"{% endif %}>
+                    <li class="li-pause-check" {% if check.status == "new" or check.status == "paused" %}class="disabled"{% endif %}>
                         <a class="pause-check"
                            href="#"
                            data-url="{% url 'hc-pause' check.code %}">