Added message cache to prevent error overflows.

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)
+            }
         }
     }
 }