Add stack trace to logger DTO (#4732)

Signed-off-by: Chris Jackson <[email protected]>

Author: cdjackson

Diff for: bundles/org.openhab.core.io.websocket/src/main/java/org/openhab/core/io/websocket/log/LogDTO.java

@@ -30,15 +30,17 @@ public class LogDTO implements Comparable<LogDTO> {
     public Date timestamp;
     public long unixtime;
     public String message;
+    public String stackTrace;
     public long sequence;
 
-    public LogDTO(long sequence, String loggerName, LogLevel level, long unixtime, String message) {
+    public LogDTO(long sequence, String loggerName, LogLevel level, long unixtime, String message, String stackTrace) {
         this.sequence = sequence;
         this.loggerName = loggerName;
         this.level = level;
         this.timestamp = new Date(unixtime);
         this.unixtime = unixtime;
         this.message = message;
+        this.stackTrace = stackTrace;
     }
 
     @Override

Diff for: bundles/org.openhab.core.io.websocket/src/main/java/org/openhab/core/io/websocket/log/LogWebSocket.java

@@ -13,6 +13,8 @@
 package org.openhab.core.io.websocket.log;
 
 import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Enumeration;
@@ -265,8 +267,18 @@ private static Predicate<Pattern> logPatternMatch(LogEntry logEntry) {
     }
 
     private LogDTO map(LogEntry logEntry) {
+        String stackTrace;
+        if (logEntry.getException() != null) {
+            StringWriter sw = new StringWriter();
+            PrintWriter pw = new PrintWriter(sw);
+            logEntry.getException().printStackTrace(pw);
+            stackTrace = sw.toString();
+        } else {
+            stackTrace = "";
+        }
+
         return new LogDTO(logEntry.getSequence(), logEntry.getLoggerName(), logEntry.getLogLevel(), logEntry.getTime(),
-                logEntry.getMessage());
+                logEntry.getMessage(), stackTrace);
     }
 
     private void stopDeferredScheduledFuture() {