Issue 187: Add MQTT to Pravega bridge sample

Signed-off-by: Claudio Fahey <claudio.fahey@dell.com>

# Conflicts:
#	README.md
#	settings.gradle

README.md

@@ -54,6 +54,7 @@ The related documentation and instructions are [here](hadoop-connector-examples)
 | [`turbineheatprocessor`](scenarios/turbine-heat-processor) | A Flink streaming application for processing temperature data from a Pravega stream produced by the `turbineheatsensor` app. The application computes a daily summary of the temperature range observed on that day by each sensor. | [Java](scenarios/turbine-heat-processor/src/main/java/io/pravega/turbineheatprocessor), [Scala](scenarios/turbine-heat-processor/src/main/scala/io/pravega/turbineheatprocessor)
 | [`anomaly-detection`](scenarios/anomaly-detection) | A Flink streaming application for detecting anomalous input patterns using a finite-state machine. | [Java](scenarios/anomaly-detection/src/main/java/io/pravega/anomalydetection)
 | [`pravega-flink-connector-sql-samples`](scenarios/pravega-flink-connector-sql-samples) | Flink connector table api/sql samples. | [Java](scenarios/pravega-flink-connector-sql-samples/src/main/java/io/pravega/connectors.nytaxi)
+| [`mqtt-pravega-bridge`](scenarios/mqtt-pravega-bridge) | A sample application reads events from MQTT and writes them to a Pravega stream. | [Java](scenarios/mqtt-pravega-bridge/src/main/java/com/dell/mqtt/pravega)
 
 
 # Build Instructions

scenarios/mqtt-pravega-bridge/README.md

@@ -0,0 +1,86 @@
+# MQTT to Pravega Bridge
+
+This sample application reads events from MQTT and writes them to a Pravega stream.
+
+## Components
+
+- Pravega: Pravega provides a new storage abstraction - a stream - for continuous and unbounded data.
+  A Pravega stream is a durable, elastic, append-only, unbounded sequence of bytes that has good performance and strong consistency.
+
+  Pravega provides dynamic scaling that can increase and decrease parallelism to automatically respond
+  to changes in the event rate.
+
+  See <http://pravega.io> for more information.
+
+- Pravega Video Demo: This is a simple command-line application that demonstrates how to write video files to Pravega.
+  It also demonstrates how to read the video files from Pravega and decode them.
+
+- Docker: This demo uses Docker and Docker Compose to greatly simplify the deployment of the various
+  components on Linux and/or Windows servers, desktops, or even laptops.
+  For more information, see <https://en.wikipedia.org/wiki/Docker_(software)>.
+
+## Building and Running the Demo
+
+### Install Java 8
+
+```
+apt-get install openjdk-8-jdk
+```
+
+### Install IntelliJ
+
+Install from <https://www.jetbrains.com/idea>.
+Enable the Lombok plugin.
+Enable Annotations (settings -> build, execution, deployment, -> compiler -> annotation processors).
+
+### Install Docker and Docker Compose
+
+See <https://docs.docker.com/install/linux/docker-ce/ubuntu/>
+and <https://docs.docker.com/compose/install/>.
+
+### Run Pravega
+
+This will run a development instance of Pravega locally.
+In the command below, replace x.x.x.x with the IP address of a local network interface such as eth0.
+
+```
+cd
+git clone https://github.com/pravega/pravega
+cd pravega
+export HOST_IP=x.x.x.x
+docker-compose up -d
+```
+
+You can view the Pravega logs with `docker-compose logs --follow`.
+You can view the stream files stored on HDFS with `docker-compose exec hdfs hdfs dfs -ls -h -R /`.
+
+### Usage
+
+- Install Mosquitto MQTT broker and clients.
+  ```
+  sudo apt-get install mosquitto mosquitto-clients
+  ```
+
+- If not automatically started, start Mosquitto broker.
+  ```
+  mosquitto
+  ```
+
+- Edit the file scenarios/mqtt-pravega-bridge/src/main/dist/conf
+  to specify your Pravega controller URI (controllerUri) as
+  `tcp://HOST_IP:9090`.
+
+- In IntelliJ, run the class com.dell.mqtt.pravega.ApplicationMain with the following parameters:
+  ```
+  scenarios/mqtt-pravega-bridge/src/main/dist/conf
+  ```
+
+- Publish a sample MQTT message.
+  ```
+  mosquitto_pub -t center/0001 -m "12,34,56.78"
+  ```
+
+- You should see the following application output:
+  ```
+  [MQTT Call: CanDataReader] com.dell.mqtt.pravega.MqttListener: Writing Data Packet: CarID: 0001 Timestamp: 1551671403118 Payload: [B@2813d92f annotation: null
+  ```

scenarios/mqtt-pravega-bridge/build.gradle

@@ -0,0 +1,58 @@
+plugins {
+    id 'com.github.johnrengelman.shadow' version '1.2.4'
+}
+
+group 'com.dell.mqtt'
+version = samplesVersion
+
+task wrapper(type: Wrapper) {
+  gradleVersion = '3.1'
+  distributionUrl = "https://services.gradle.org/distributions/gradle-$gradleVersion-all.zip"
+}
+
+apply plugin: 'java'
+apply plugin: "distribution"
+apply plugin: 'application'
+
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+mainClassName = 'com.dell.mqtt.pravega.ApplicationMain'
+applicationDefaultJvmArgs = ["-Dlog4j.configuration=file:conf/log4j.properties"]
+archivesBaseName = 'pravega-mqtt-bridge'
+
+repositories {
+    mavenCentral()
+    maven {
+        url "https://repository.apache.org/snapshots"
+    }
+    maven {
+        url "https://oss.sonatype.org/content/repositories/snapshots"
+    }
+}
+
+dependencies {
+    testCompile group: 'junit', name: 'junit', version: '4.11'
+    compile "org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0"
+    compile "org.slf4j:slf4j-api:1.6.6"
+    compile "ch.qos.logback:logback-classic:1.0.9"
+    compile "com.google.guava:guava:20.0"
+    compile "io.pravega:pravega-client:${pravegaVersion}"
+}
+
+shadowJar {
+    dependencies {
+        include dependency("org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0")
+    }
+}
+
+distributions {
+    main {
+        baseName = archivesBaseName
+        contents {
+            into('lib') {
+                from shadowJar
+                from(project.configurations.shadow)
+            }
+        }
+    }
+}

scenarios/mqtt-pravega-bridge/src/main/dist/conf/bridge.properties

@@ -0,0 +1,14 @@
+# Pravega Properties
+controllerUri=tcp://127.0.0.1:9090
+scope=examples
+stream=mqtt-example
+scaling.targetRate=100
+scaling.scaleFactor=3
+scaling.minNumSegments=3
+
+# MQTT Properties
+brokerUri=tcp://127.0.0.1:1883
+topic=center/#
+clientId=CanDataReader
+userName=admin
+password=password

scenarios/mqtt-pravega-bridge/src/main/dist/conf/log4j.properties

@@ -0,0 +1,13 @@
+log4j.rootLogger=INFO, stdout, file
+
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.Target=System.out
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
+
+log4j.appender.file=org.apache.log4j.RollingFileAppender
+log4j.appender.file.File=workspace.log
+log4j.appender.file.MaxFileSize=10MB
+log4j.appender.file.MaxBackupIndex=10
+log4j.appender.file.layout=org.apache.log4j.PatternLayout
+log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

scenarios/mqtt-pravega-bridge/src/main/dist/conf/logback.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+
+ Copyright (c) 2017 Dell Inc., or its subsidiaries. All Rights Reserved.
+ 
+ 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
+   
+-->
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <target>System.out</target>
+        <encoder>
+            <pattern>%-5level [%d{yyyy-MM-dd HH:mm:ss.SSS}] [%thread] %logger{36}: %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

scenarios/mqtt-pravega-bridge/src/main/dist/conf/logger.xml

@@ -0,0 +1,32 @@
+<configuration>
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <!-- encoders are assigned the type
+     ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>logFile.log</file>
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <!-- daily rollover -->
+            <fileNamePattern>workspace.%d{yyyy-MM-dd}.log</fileNamePattern>
+
+            <!-- keep 1 days' worth of history -->
+            <maxHistory>5</maxHistory>
+        </rollingPolicy>
+
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS}  %-4relative [%thread] %-5level %logger{35} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <root level="info" additivity="false">
+        <appender-ref ref="STDOUT"/>
+        <appender-ref ref="FILE"/>
+    </root>
+
+
+</configuration>

scenarios/mqtt-pravega-bridge/src/main/java/com/dell/mqtt/pravega/ApplicationArguments.java

@@ -0,0 +1,76 @@
+package com.dell.mqtt.pravega;
+
+import com.google.common.base.Preconditions;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.util.Properties;
+
+public class ApplicationArguments {
+
+    private final PravegaArgs pravegaArgs = new PravegaArgs();
+    private final MqttArgs mqttArgs = new MqttArgs();
+
+    public ApplicationArguments(String confDir) throws Exception {
+        loadProperties(confDir);
+    }
+
+    private void loadProperties(String confDir) throws Exception{
+        Properties prop = new Properties();
+        try (
+                InputStream inputStream = new FileInputStream(confDir + File.separator + "bridge.properties");
+             )
+        {
+            prop.load(inputStream);
+
+            pravegaArgs.controllerUri = prop.getProperty("controllerUri");
+            pravegaArgs.scope = prop.getProperty("scope");
+            pravegaArgs.stream = prop.getProperty("stream");
+            pravegaArgs.targetRate = Integer.parseInt(prop.getProperty("scaling.targetRate"));
+            pravegaArgs.scaleFactor = Integer.parseInt(prop.getProperty("scaling.scaleFactor"));
+            pravegaArgs.minNumSegments = Integer.parseInt(prop.getProperty("scaling.minNumSegments"));
+
+            mqttArgs.brokerUri = prop.getProperty("brokerUri");
+            mqttArgs.topic = prop.getProperty("topic");
+            mqttArgs.clientId = prop.getProperty("clientId");
+            mqttArgs.userName = prop.getProperty("userName");
+            mqttArgs.password = prop.getProperty("password");
+
+            Preconditions.checkNotNull(pravegaArgs.controllerUri, "Pravega Controller URI is missing");
+            Preconditions.checkNotNull(pravegaArgs.scope, "Pravega scope is missing");
+            Preconditions.checkNotNull(pravegaArgs.stream, "Pravega stream is missing");
+
+            Preconditions.checkNotNull(mqttArgs.brokerUri, "MQTT Broker URI is missing");
+            Preconditions.checkNotNull(mqttArgs.topic, "MQTT topic is missing");
+            Preconditions.checkNotNull(mqttArgs.clientId, "MQTT clientId is missing");
+            Preconditions.checkNotNull(mqttArgs.userName, "MQTT userName is missing");
+            Preconditions.checkNotNull(mqttArgs.password, "MQTT password is missing");
+        }
+    }
+
+    public PravegaArgs getPravegaArgs() {
+        return pravegaArgs;
+    }
+
+    public MqttArgs getMqttArgs() {
+        return mqttArgs;
+    }
+
+    public static class PravegaArgs {
+        protected String controllerUri;
+        protected String scope;
+        protected String stream;
+        protected int targetRate;
+        protected int scaleFactor;
+        protected int minNumSegments;
+    }
+
+    public static class MqttArgs {
+        protected String brokerUri;
+        protected String topic;
+        protected String clientId;
+        protected String userName;
+        protected String password;
+    }
+}

scenarios/mqtt-pravega-bridge/src/main/java/com/dell/mqtt/pravega/ApplicationMain.java

@@ -0,0 +1,56 @@
+package com.dell.mqtt.pravega;
+
+import org.eclipse.paho.client.mqttv3.MqttClient;
+import org.eclipse.paho.client.mqttv3.MqttException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.concurrent.CountDownLatch;
+
+public class ApplicationMain {
+
+    private static Logger log = LoggerFactory.getLogger( ApplicationMain.class );
+
+    public static void main(String ... args) {
+
+        if (args.length != 1) {
+            log.error("Missing required arguments. Usage: java com.dell.mqtt.pravega.ApplicationMain <CONF_DIR_PATH>");
+            return;
+        }
+
+        String confDir = args[0];
+        log.info("loading configurations from {}", confDir);
+
+        final CountDownLatch latch = new CountDownLatch(1);
+
+        try {
+            ApplicationArguments applicationArguments = new ApplicationArguments(confDir);
+            MqttListener listener = new MqttListener(applicationArguments.getPravegaArgs());
+
+            MqttConnectionBuilder builder = new MqttConnectionBuilder();
+            builder.brokerUri(applicationArguments.getMqttArgs().brokerUri);
+            builder.topic(applicationArguments.getMqttArgs().topic);
+            builder.clientId(applicationArguments.getMqttArgs().clientId);
+            builder.userName(applicationArguments.getMqttArgs().userName);
+            builder.password(applicationArguments.getMqttArgs().password);
+            builder.bridge(listener);
+
+            MqttClient mqttClient = builder.connect();
+
+            Runtime.getRuntime().addShutdownHook(new Thread(() -> {
+                log.info("Going to close the application");
+                if (mqttClient != null) {
+                    try {
+                        mqttClient.close();
+                    } catch (MqttException e) {
+                        log.error("Exception Occurred while closing MQTT client", e);
+                    }
+                }
+                latch.countDown();
+            }));
+        } catch (Exception e) {
+            log.error("Exception Occurred", e);
+        }
+
+    }
+}