allow dashboards to retry fetching chart data on failures; fixes #1402

3 files changed, 26 insertions, 4 deletions

diff --git a/web/dashboard.js b/web/dashboard.js
index a62b31d4ae..0db567107a 100644
--- a/web/dashboard.js
+++ b/web/dashboard.js
@@ -332,6 +332,8 @@
             async_on_scroll: false,                 // sync/async onscroll handler
             onscroll_worker_duration_threshold: 30, // time in ms, to consider slow the onscroll handler
 
+            retries_on_data_failures: 3, // how many retries to make if we can't fetch chart data from the server
+
             setOptionCallback: function() { ; }
         },
 
@@ -1231,6 +1233,9 @@
         // the chart library requested by the user
         this.library_name = self.data('chart-library') || NETDATA.chartDefaults.library;
 
+        // how many retries we have made to load chart data from the server
+        this.retries_on_data_failures = 0;
+
         // object - the chart library used
         this.library = null;
 
@@ -3077,6 +3082,7 @@
             })
             .done(function(data) {
                 that.xhr = undefined;
+                that.retries_on_data_failures = 0;
 
                 if(that.debug === true)
                     that.log('data received. updating chart.');
@@ -3086,8 +3092,18 @@
             .fail(function(msg) {
                 that.xhr = undefined;
 
-                if(msg.statusText !== 'abort')
-                    error('data download failed for url: ' + that.data_url);
+                if(msg.statusText !== 'abort') {
+                    that.retries_on_data_failures++;
+                    if(that.retries_on_data_failures > NETDATA.options.current.retries_on_data_failures) {
+                        // that.log('failed ' + that.retries_on_data_failures.toString() + ' times - giving up');
+                        that.retries_on_data_failures = 0;
+                        error('data download failed for url: ' + that.data_url);
+                    }
+                    else {
+                        that.tm.last_autorefreshed = Date.now();
+                        // that.log('failed ' + that.retries_on_data_failures.toString() + ' times, but I will retry');
+                    }
+                }
             })
             .always(function() {
                 that.xhr = undefined;
diff --git a/web/demosites.html b/web/demosites.html
index 63a62d6966..e212e4cd0a 100644
--- a/web/demosites.html
+++ b/web/demosites.html
@@ -505,7 +505,7 @@ p {
     and that you have chown it to be owned by netdata:netdata
 -->
 <!-- <script type="text/javascript" src="http://my.server:19999/dashboard.js"></script> -->
-<script type="text/javascript" src="dashboard.js?v20161218-1"></script>
+<script type="text/javascript" src="dashboard.js?v20161219-1"></script>
 
 <script>
     // --- OPTIONS FOR THE CHARTS --
@@ -529,6 +529,9 @@ p {
     // since we have many servers and limited sockets,
     // abort ajax calls when we scroll
     NETDATA.options.current.abort_ajax_on_scroll = true;
+
+    // do not to give errors on netdata demo servers for 60 seconds
+    NETDATA.options.current.retries_on_data_failures = 60;
 </script>
 
 <style>
diff --git a/web/index.html b/web/index.html
index 491b772ba4..64ca0aef8b 100644
--- a/web/index.html
+++ b/web/index.html
@@ -2511,6 +2511,9 @@
         });
 
         if(isdemo()) {
+            // do not to give errors on netdata demo servers for 60 seconds
+            NETDATA.options.current.retries_on_data_failures = 60;
+
             if(urlOptions.nowelcome !== true) {
                 setTimeout(function() {
                     $('#welcomeModal').modal();
@@ -3185,4 +3188,4 @@
     </div>
 </body>
 </html>
-<script type="text/javascript" src="dashboard.js?v20161218-5"></script>
+<script type="text/javascript" src="dashboard.js?v20161219-1"></script>