Omit timings in production mode (#19644)

* UIDL responses only include server side timing information when not
in production mode.
* Update documentation accordingly.

Change-Id: I961d1fdc96b3d04f22254fcd13a5412f17118b42

4 files changed, 22 insertions, 7 deletions

diff --git a/WebContent/release-notes.html b/WebContent/release-notes.html
index f7b5611be5..fc1d69fd24 100644
--- a/WebContent/release-notes.html
+++ b/WebContent/release-notes.html
@@ -142,6 +142,8 @@
                 This default can be changed in deployment configuration.</li>
             <li>The annotations @PreserveOnRefresh, @Push, @Theme, @Title, @VaadinServletConfiguration and @Widgetset now use
                 @Inherited. The annotation is also looked up in extended interfaces for backwards compatibility.</li>
+            <li>Server-side timings of request processing are only sent to the client when not in production mode. Using the
+                timings in TestBench tests requires the server not to be in production mode.</li>
         </ul>
         <h3 id="knownissues">Known Issues and Limitations</h3>
         <ul>
diff --git a/client/src/com/vaadin/client/ApplicationConnection.java b/client/src/com/vaadin/client/ApplicationConnection.java
index ce55c13ce5..6830f21bcd 100644
--- a/client/src/com/vaadin/client/ApplicationConnection.java
+++ b/client/src/com/vaadin/client/ApplicationConnection.java
@@ -491,7 +491,11 @@ public class ApplicationConnection implements HasHandlers {
                 smh.@com.vaadin.client.communication.MessageHandler::lastProcessingTime,
                     smh.@com.vaadin.client.communication.MessageHandler::totalProcessingTime
                 ];
-            pd = pd.concat(smh.@com.vaadin.client.communication.MessageHandler::serverTimingInfo);
+            if (null != smh.@com.vaadin.client.communication.MessageHandler::serverTimingInfo) {
+                pd = pd.concat(smh.@com.vaadin.client.communication.MessageHandler::serverTimingInfo);
+            } else {
+                pd = pd.concat(-1, -1);
+            }
             pd[pd.length] = smh.@com.vaadin.client.communication.MessageHandler::bootstrapTime;
             return pd;
         });
diff --git a/documentation/advanced/advanced-debug.asciidoc b/documentation/advanced/advanced-debug.asciidoc
index 9a0d8d7ba8..9731c650af 100644
--- a/documentation/advanced/advanced-debug.asciidoc
+++ b/documentation/advanced/advanced-debug.asciidoc
@@ -14,14 +14,20 @@ debug features for Vaadin developers:
 * Debug Window
 * Display debug information in the Debug Window and server console
 * On-the-fly compilation of Sass themes
+* Timings of server calls for Vaadin TestBench
+
+It is recommended to always deploy production applications in production mode
+for security reasons.
 
 [[advanced.debug.mode]]
 == Enabling the Debug Mode
 
 The debug mode is enabled and production mode disabled by default in the UI
-templates created with the Eclipse plugin or the Maven archetypes. The debug
-mode can be enabled by giving a [parameter]#productionMode=false# parameter to
-the Vaadin servlet configuration:
+templates created with the Eclipse plugin or the Maven archetypes. Some
+archetypes have a separate module and profile for producing a production mode
+application. The debug mode can be enabled by giving a
+[parameter]#productionMode=false# parameter to the Vaadin servlet
+configuration:
 
 [subs="normal"]
 ----
diff --git a/server/src/com/vaadin/server/communication/UidlWriter.java b/server/src/com/vaadin/server/communication/UidlWriter.java
index b117cb4b4d..8a4e62fb24 100644
--- a/server/src/com/vaadin/server/communication/UidlWriter.java
+++ b/server/src/com/vaadin/server/communication/UidlWriter.java
@@ -352,9 +352,12 @@ public class UidlWriter implements Serializable {
      * @throws IOException
      */
     private void writePerformanceData(UI ui, Writer writer) throws IOException {
-        writer.write(String.format(", \"timings\":[%d, %d]", ui.getSession()
-                .getCumulativeRequestDuration(), ui.getSession()
-                .getLastRequestDuration()));
+        if (!ui.getSession().getService().getDeploymentConfiguration()
+                .isProductionMode()) {
+            writer.write(String.format(", \"timings\":[%d, %d]", ui
+                    .getSession().getCumulativeRequestDuration(), ui
+                    .getSession().getLastRequestDuration()));
+        }
     }
 
     private static final Logger getLogger() {