Merge with develop/2.5.5

@@ -15,6 +15,7 @@
  */
 package org.thingsboard.server.dao.event;
 
+import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.util.concurrent.ListenableFuture;
 import lombok.extern.slf4j.Slf4j;
 import org.apache.commons.lang3.StringUtils;
@@ -28,6 +29,7 @@ import org.thingsboard.server.common.data.page.TimePageLink;
 import org.thingsboard.server.dao.exception.DataValidationException;
 import org.thingsboard.server.dao.service.DataValidator;
 
+import java.nio.charset.StandardCharsets;
 import java.util.List;
 import java.util.Optional;
 
@@ -35,6 +37,8 @@ import java.util.Optional;
 @Slf4j
 public class BaseEventService implements EventService {
 
+    private static final int MAX_DEBUG_EVENT_SYMBOLS = 4 * 1024;
+
     @Autowired
     public EventDao eventDao;
 
@@ -47,6 +51,7 @@ public class BaseEventService implements EventService {
     @Override
     public ListenableFuture<Event> saveAsync(Event event) {
         eventValidator.validate(event, Event::getTenantId);
+        checkAndTruncateDebugEvent(event);
         return eventDao.saveAsync(event);
     }
 
@@ -56,9 +61,21 @@ public class BaseEventService implements EventService {
         if (StringUtils.isEmpty(event.getUid())) {
             throw new DataValidationException("Event uid should be specified!.");
         }
+        checkAndTruncateDebugEvent(event);
         return eventDao.saveIfNotExists(event);
     }
 
+    private void checkAndTruncateDebugEvent(Event event) {
+        if (event.getType().startsWith("DEBUG") && event.getBody() != null && event.getBody().has("data")) {
+            String dataStr = event.getBody().get("data").asText();
+            int length = dataStr.length();
+            if (length > MAX_DEBUG_EVENT_SYMBOLS) {
+                ((ObjectNode) event.getBody()).put("data", dataStr.substring(0, MAX_DEBUG_EVENT_SYMBOLS) + "...[truncated " + (length - MAX_DEBUG_EVENT_SYMBOLS) + " symbols]");
+                log.trace("[{}] Event was truncated: {}", event.getId(), dataStr);
+            }
+        }
+    }
+
     @Override
     public Optional<Event> findEvent(TenantId tenantId, EntityId entityId, String eventType, String eventUid) {
         if (tenantId == null) {