From b63c5f27853aded30c492bdb94a680e5a9c9648b Mon Sep 17 00:00:00 2001
From: Mario <mario@mariovavti.com>
Date: Sat, 14 Nov 2020 21:28:50 +0000
Subject: Polling fallback to server sent events. Polling is the default. SSE
 must be enabled in /admin/site > Advanced > Enable SSE Notifications if
 desired.

---
 view/js/main.js         | 82 ++++++++++++++++++++++++++++++++++---------------
 view/tpl/admin_site.tpl |  1 +
 view/tpl/head.tpl       |  1 +
 3 files changed, 59 insertions(+), 25 deletions(-)

(limited to 'view')

diff --git a/view/js/main.js b/view/js/main.js
index 8ceb0b143..560868046 100644
--- a/view/js/main.js
+++ b/view/js/main.js
@@ -31,6 +31,7 @@ var sse_offset = 0;
 var sse_type;
 var sse_partial_result = false;
 var sse_rmids = [];
+var sse_fallback_interval;
 
 var page_cache = {};
 
@@ -94,37 +95,56 @@ $(document).ready(function() {
 	
 	jQuery.timeago.settings.allowFuture = true;
 
-	if(typeof(window.SharedWorker) === 'undefined') {
-		// notifications with multiple tabs open will not work very well in this scenario 
-		var evtSource = new EventSource('/sse');
 
-		evtSource.addEventListener('notifications', function(e) {
-			var obj = JSON.parse(e.data);
-			sse_handleNotifications(obj, false, false);
-		}, false);
+	if(sse_enabled) {
+		if(typeof(window.SharedWorker) === 'undefined') {
+			// notifications with multiple tabs open will not work very well in this scenario 
+			var evtSource = new EventSource('/sse');
 
-		document.addEventListener('visibilitychange', function() {
-			if (!document.hidden) {
-				sse_offset = 0;
-				sse_bs_init();
-			}
-		}, false);
+			evtSource.addEventListener('notifications', function(e) {
+				var obj = JSON.parse(e.data);
+				sse_handleNotifications(obj, false, false);
+			}, false);
 
-	}
-	else {
-		var myWorker = new SharedWorker('/view/js/sse_worker.js', localUser);
+			document.addEventListener('visibilitychange', function() {
+				if (!document.hidden) {
+					sse_offset = 0;
+					sse_bs_init();
+				}
+			}, false);
 
-		myWorker.port.onmessage = function(e) {
-			obj = e.data;
-			console.log(obj);
-			sse_handleNotifications(obj, false, false);
 		}
+		else {
+			var myWorker = new SharedWorker('/view/js/sse_worker.js', localUser);
 
-		myWorker.onerror = function(e) {
-			myWorker.port.close();
+			myWorker.port.onmessage = function(e) {
+				obj = e.data;
+				console.log(obj);
+				sse_handleNotifications(obj, false, false);
+			}
+
+			myWorker.onerror = function(e) {
+				myWorker.port.close();
+			}
+
+			myWorker.port.start();
 		}
+	}
+	else {
+		if (!document.hidden)
+			sse_fallback_interval = setInterval(sse_fallback, updateInterval);
 
-		myWorker.port.start();
+		document.addEventListener('visibilitychange', function() {
+			if (document.hidden) {
+				clearInterval(sse_fallback_interval);
+			}
+			else {
+				sse_offset = 0;
+				sse_bs_init();
+				sse_fallback_interval = setInterval(sse_fallback, updateInterval);
+			}
+
+		}, false);
 	}
 
 	$('.notification-link').on('click', { replace: true, followup: false }, sse_bs_notifications);
@@ -224,6 +244,8 @@ $(document).ready(function() {
 			cache_next_page();
 	});
 
+
+
 });
 
 function getConversationSettings() {
@@ -1763,8 +1785,6 @@ function sse_bs_init() {
 }
 
 function sse_bs_counts() {
-
-
 	if(sse_bs_active)
 		return;
 
@@ -2022,3 +2042,15 @@ function sse_setNotificationsStatus() {
 	}
 
 }
+
+function sse_fallback() {
+	$.get('/sse', function(obj) {
+		if(! obj)
+			return;
+
+		console.log('sse fallback');
+		console.log(obj);
+
+		sse_handleNotifications(obj, false, false);
+	});
+}
diff --git a/view/tpl/admin_site.tpl b/view/tpl/admin_site.tpl
index 5e10e6eea..8d32ba9a4 100755
--- a/view/tpl/admin_site.tpl
+++ b/view/tpl/admin_site.tpl
@@ -95,6 +95,7 @@
     </div>
 	
 	<h3>{{$advanced}}</h3>
+	{{include file="field_checkbox.tpl" field=$sse_enabled}}
 	{{include file="field_input.tpl" field=$imagick_path}}
 	{{include file="field_input.tpl" field=$proxy}}
 	{{include file="field_input.tpl" field=$proxyuser}}
diff --git a/view/tpl/head.tpl b/view/tpl/head.tpl
index bd4cf3747..0d212e029 100755
--- a/view/tpl/head.tpl
+++ b/view/tpl/head.tpl
@@ -9,6 +9,7 @@
 {{$plugins}}
 <script>
 	var updateInterval = {{$update_interval}};
+	var sse_enabled = {{$sse_enabled}};
 	var localUser = {{if $local_channel}}{{$local_channel}}{{else}}false{{/if}};
 	var zid = {{if $zid}}'{{$zid}}'{{else}}null{{/if}};
 	var justifiedGalleryActive = false;
-- 
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