Added BugSnag error tracker

broker/pom.xml

@@ -100,17 +100,23 @@
             <version>5.1.0</version>
         </dependency>
 
+        <dependency>
+            <groupId>com.bugsnag</groupId>
+            <artifactId>bugsnag</artifactId>
+            <version>[3.0,4.0)</version>
+        </dependency>
+
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
             <version>1.10</version>
         </dependency>
 
-        <dependency>
-            <groupId>org.hdrhistogram</groupId>
-            <artifactId>HdrHistogram</artifactId>
-            <version>2.1.4</version>
-        </dependency>
+        <!--<dependency>-->
+            <!--<groupId>org.hdrhistogram</groupId>-->
+            <!--<artifactId>HdrHistogram</artifactId>-->
+            <!--<version>2.1.4</version>-->
+        <!--</dependency>-->
 
         <dependency>
             <groupId>com.hazelcast</groupId>

broker/src/main/java/io/moquette/BrokerConstants.java

@@ -61,6 +61,10 @@ public final class BrokerConstants {
     public static final String METRICS_LIBRATO_EMAIL_PROPERTY_NAME = "metrics.librato.email";
     public static final String METRICS_LIBRATO_TOKEN_PROPERTY_NAME = "metrics.librato.token";
     public static final String METRICS_LIBRATO_SOURCE_PROPERTY_NAME = "metrics.librato.source";
+
+    public static final String BUGSNAG_ENABLE_PROPERTY_NAME = "use_bugsnag";
+    public static final String BUGSNAG_TOKEN_PROPERTY_NAME = "bugsnag.token";
+
     public static final String STORAGE_CLASS_NAME = "storage_class";
 
     private BrokerConstants() {

broker/src/main/java/io/moquette/server/netty/BugSnagErrorsHandler.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2012-2017 The original author or authors
+ * ------------------------------------------------------
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * and Apache License v2.0 which accompanies this distribution.
+ *
+ * The Eclipse Public License is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * The Apache License v2.0 is available at
+ * http://www.opensource.org/licenses/apache2.0.php
+ *
+ * You may elect to redistribute this code under either of these licenses.
+ */
+package io.moquette.server.netty;
+
+import com.bugsnag.Bugsnag;
+import io.moquette.server.config.IConfig;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+
+import static io.moquette.BrokerConstants.BUGSNAG_TOKEN_PROPERTY_NAME;
+
+public class BugSnagErrorsHandler extends ChannelInboundHandlerAdapter {
+
+    private Bugsnag bugsnag;
+
+    public void init(IConfig props) {
+        final String token = props.getProperty(BUGSNAG_TOKEN_PROPERTY_NAME);
+        this.bugsnag = new Bugsnag(token);
+    }
+
+    @Override
+    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
+        bugsnag.notify(cause);
+        ctx.fireExceptionCaught(cause);
+    }
+}

broker/src/main/java/io/moquette/server/netty/NettyAcceptor.java

@@ -97,6 +97,7 @@ public class NettyAcceptor implements ServerAcceptor {
     BytesMetricsCollector m_bytesMetricsCollector = new BytesMetricsCollector();
     MessageMetricsCollector m_metricsCollector = new MessageMetricsCollector();
     private Optional<? extends ChannelInboundHandler> metrics;
+    private Optional<? extends ChannelInboundHandler> errorsCather;
 
     private int nettySoBacklog;
     private boolean nettySoReuseaddr;
@@ -145,6 +146,14 @@ public class NettyAcceptor implements ServerAcceptor {
             this.metrics = Optional.empty();
         }
 
+        final boolean useBugSnag = Boolean.parseBoolean(props.getProperty(BUGSNAG_ENABLE_PROPERTY_NAME, "false"));
+        if (useBugSnag) {
+            BugSnagErrorsHandler bugSnagHandler = new BugSnagErrorsHandler();
+            bugSnagHandler.init(props);
+            this.errorsCather = Optional.of(bugSnagHandler);
+        } else {
+            this.errorsCather = Optional.empty();
+        }
         initializePlainTCPTransport(mqttHandler, props);
         initializeWebSocketTransport(mqttHandler, props);
         String sslTcpPortProp = props.getProperty(BrokerConstants.SSL_PORT_PROPERTY_NAME);

broker/src/test/java/io/moquette/spi/ClientSessionTest.java

@@ -20,10 +20,13 @@ import io.moquette.persistence.MemoryStorageService;
 import io.moquette.spi.impl.subscriptions.Subscription;
 import io.moquette.spi.impl.subscriptions.SubscriptionsDirectory;
 import io.moquette.spi.impl.subscriptions.Topic;
-import static io.netty.handler.codec.mqtt.MqttQoS.*;
 import org.junit.Before;
 import org.junit.Test;
+
 import java.util.List;
+
+import static io.netty.handler.codec.mqtt.MqttQoS.AT_MOST_ONCE;
+import static io.netty.handler.codec.mqtt.MqttQoS.EXACTLY_ONCE;
 import static org.junit.Assert.assertEquals;
 
 public class ClientSessionTest {

distribution/src/main/resources/moquette.conf

@@ -126,3 +126,11 @@ password_file config/password_file.conf
 # metrics.librato.token sdfergheghliuhyr2283ehd9827398h
 # metrics.librato.source My Fantastic Service
 
+#*********************************************************************
+# Error Monitoring
+#
+# use_bugsnag: used to enable BugSnag error handler catcher.
+# bugsnag.token: the token from your's bugsnag account
+#*********************************************************************
+# use_bugsnag false
+# bugsnag.token wleifb8723784dbfeig74