From 54a1e74e2762dff48cf169bd25c5bcc977f31df0 Mon Sep 17 00:00:00 2001
From: Uwe Oestermeier <u.oestermeier@iwm-tuebingen.de>
Date: Tue, 18 Jun 2019 09:00:05 +0200
Subject: [PATCH] Added message cache to prevent error overflows.

---
 lib/logging.js | 38 +++++++++++++++++++++++++++++---------
 1 file changed, 29 insertions(+), 9 deletions(-)

diff --git a/lib/logging.js b/lib/logging.js
index 63f3846..eed4b14 100644
--- a/lib/logging.js
+++ b/lib/logging.js
@@ -1,11 +1,17 @@
 let ipc = null
+let logMessages = new Set()
 
 try {
     ipc = require('electron').ipcRenderer
-} catch (e) {}
+} catch (e) {
+    console.log("Cannot use electron logging.")
+}
 
 /** Basic class for app specific logging requirements.
  * Can be used to implement persistent logging in electron apps.
+ * Uses a logMessage cache to prevent error overflows. This is 
+ * needed since errors may occur very frequently
+ * (e.g. display update loops at 60fps, programmatic loops, ...).
  */
 export default class Logging {
 
@@ -21,19 +27,33 @@ export default class Logging {
         }
     }
 
+    /**
+     * Static warn function. 
+     * Emits each warning only once per session.
+     * @param {*} message 
+     */
     static warn(message) {
-        if (ipc) {
-            ipc.send('warn', message)
-        } else {
-            console.warn(message)
+        if (!logMessages.has(message)) {
+            if (ipc) {
+                ipc.send('warn', message)
+            } else {
+                console.warn(message)
+            }
         }
     }
 
+    /**
+    * Static error function. 
+    * Emits each error message only once per session.
+    * @param {*} message 
+    */
     static error(message) {
-        if (ipc) {
-            ipc.send('error', message)
-        } else {
-            console.error(message)
+        if (!logMessages.has(message)) {
+            if (ipc) {
+                ipc.send('error', message)
+            } else {
+                console.error(message)
+            }
         }
     }
 }