DATAMONGO-1645 - Safely serialize JSON output for log message in LoggingEventListener.

We now make sure to safely serialize JSON output for mapped documents. This prevents the logger from rendering false exception messages to log appender.

Original pull request: #450.

Author: christophstrobl

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/mapping/event/LoggingEventListener.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2011-2013 the original author or authors.
+ * Copyright 2011-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -15,6 +15,8 @@
  */
 package org.springframework.data.mongodb.core.mapping.event;
 
+import static org.springframework.data.mongodb.core.query.SerializationUtils.*;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.context.ApplicationListener;
@@ -23,9 +25,10 @@
 
 /**
  * {@link ApplicationListener} for Mongo mapping events logging the events.
- * 
+ *
  * @author Jon Brisbin
  * @author Martin Baumgartner
+ * @author Christoph Strobl
  */
 public class LoggingEventListener extends AbstractMongoEventListener<Object> {
 
@@ -46,7 +49,7 @@ public void onBeforeConvert(Object source) {
 	 */
 	@Override
 	public void onBeforeSave(Object source, DBObject dbo) {
-		LOGGER.info("onBeforeSave: {}, {}", source, dbo);
+		LOGGER.info("onBeforeSave: {}, {}", source, serializeToJsonSafely(dbo));
 	}
 
 	/*
@@ -55,7 +58,7 @@ public void onBeforeSave(Object source, DBObject dbo) {
 	 */
 	@Override
 	public void onAfterSave(Object source, DBObject dbo) {
-		LOGGER.info("onAfterSave: {}, {}", source, dbo);
+		LOGGER.info("onAfterSave: {}, {}", source, serializeToJsonSafely(dbo));
 	}
 
 	/*
@@ -64,7 +67,7 @@ public void onAfterSave(Object source, DBObject dbo) {
 	 */
 	@Override
 	public void onAfterLoad(DBObject dbo) {
-		LOGGER.info("onAfterLoad: {}", dbo);
+		LOGGER.info("onAfterLoad: {}", serializeToJsonSafely(dbo));
 	}
 
 	/*
@@ -73,7 +76,7 @@ public void onAfterLoad(DBObject dbo) {
 	 */
 	@Override
 	public void onAfterConvert(DBObject dbo, Object source) {
-		LOGGER.info("onAfterConvert: {}, {}", dbo, source);
+		LOGGER.info("onAfterConvert: {}, {}", serializeToJsonSafely(dbo), source);
 	}
 
 	/*
@@ -82,7 +85,7 @@ public void onAfterConvert(DBObject dbo, Object source) {
 	 */
 	@Override
 	public void onAfterDelete(DBObject dbo) {
-		LOGGER.info("onAfterDelete: {}", dbo);
+		LOGGER.info("onAfterDelete: {}", serializeToJsonSafely(dbo));
 	}
 
 	/*
@@ -91,6 +94,6 @@ public void onAfterDelete(DBObject dbo) {
 	 */
 	@Override
 	public void onBeforeDelete(DBObject dbo) {
-		LOGGER.info("onBeforeDelete: {}", dbo);
+		LOGGER.info("onBeforeDelete: {}", serializeToJsonSafely(dbo));
 	}
 }

spring-data-mongodb/src/test/java/org/springframework/data/mongodb/core/mapping/event/LoggingEventListenerTests.java

@@ -0,0 +1,102 @@
+/*
+ * Copyright 2017 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.data.mongodb.core.mapping.event;
+
+import static org.hamcrest.core.StringStartsWith.*;
+import static org.junit.Assert.*;
+
+import ch.qos.logback.classic.Level;
+import ch.qos.logback.classic.spi.ILoggingEvent;
+import ch.qos.logback.core.read.ListAppender;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.LoggerFactory;
+
+import com.mongodb.BasicDBObject;
+
+/**
+ * @author Christoph Strobl
+ */
+public class LoggingEventListenerTests {
+
+	LoggingEventListener listener;
+	ListAppender<ILoggingEvent> appender;
+
+	@Before
+	public void setUp() {
+
+		// set log level for LoggingEventListener to "info" and set up an appender capturing events.
+		ch.qos.logback.classic.Logger logger = (ch.qos.logback.classic.Logger) LoggerFactory
+				.getLogger(LoggingEventListener.class);
+		logger.setLevel(Level.toLevel("info"));
+
+		appender = new ListAppender();
+		logger.addAppender(appender);
+		appender.start();
+
+		listener = new LoggingEventListener();
+	}
+
+	@Test // DATAMONGO-1645
+	public void shouldSerializeAfterConvertEventCorrectly() {
+
+		listener.onAfterConvert(new AfterConvertEvent<Object>(new BasicDBObject("foo", new Foo()), this, "collection"));
+
+		assertThat(appender.list.get(0).getFormattedMessage(), startsWith("onAfterConvert: { \"foo\""));
+	}
+
+	@Test // DATAMONGO-1645
+	public void shouldSerializeBeforeSaveEventEventCorrectly() {
+
+		listener.onBeforeSave(new BeforeSaveEvent<Object>(new Foo(), new BasicDBObject("foo", new Foo()), "collection"));
+
+		assertThat(appender.list.get(0).getFormattedMessage(),
+				startsWith("onBeforeSave: org.springframework.data.mongodb.core."));
+	}
+
+	@Test // DATAMONGO-1645
+	public void shouldSerializeAfterSaveEventEventCorrectly() {
+
+		listener.onAfterSave(new AfterSaveEvent<Object>(new Foo(), new BasicDBObject("foo", new Foo()), "collection"));
+
+		assertThat(appender.list.get(0).getFormattedMessage(),
+				startsWith("onAfterSave: org.springframework.data.mongodb.core."));
+	}
+
+	@Test // DATAMONGO-1645
+	public void shouldSerializeBeforeDeleteEventEventCorrectly() {
+
+		listener
+				.onBeforeDelete(new BeforeDeleteEvent<Object>(new BasicDBObject("foo", new Foo()), Object.class, "collection"));
+
+		assertThat(appender.list.get(0).getFormattedMessage(), startsWith("onBeforeDelete: { \"foo\""));
+	}
+
+	@Test // DATAMONGO-1645
+	public void shouldSerializeAfterDeleteEventEventCorrectly() {
+
+		listener
+				.onAfterDelete(new AfterDeleteEvent<Object>(new BasicDBObject("foo", new Foo()), Object.class, "collection"));
+
+		assertThat(appender.list.get(0).getFormattedMessage(), startsWith("onAfterDelete: { \"foo\""));
+	}
+
+	static class Foo {
+
+	}
+
+}