Added Custom Message Processor for Hub & Things services.

message-processor/.gitignore

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+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**
+!**/src/test/**
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+
+### VS Code ###
+.vscode/

message-processor/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>iot-things-examples</artifactId>
+        <groupId>com.bosch.iot.things.examples</groupId>
+        <version>0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>message-processor</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>Bosch IoT Things :: Custom Message Processor</name>
+    <description>Message processor application for Bosch IoT Hub/Things services</description>
+
+    <properties>
+        <java.version>8</java.version>
+        <!-- Dependency versions -->
+        <stack.version>3.8.2</stack.version>
+        <proton.version>0.33.2</proton.version>
+        <rx.version>2.1.0</rx.version>
+        <rs.version>1.0.3</rs.version>
+        <junit.version>4.12</junit.version>
+        <!-- Test properties -->
+        <proton.trace.frames>false</proton.trace.frames>
+        <spring.version>2.2.0.RELEASE</spring.version>
+    </properties>
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-dependencies</artifactId>
+                <version>${spring.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <dependency>
+                <groupId>io.vertx</groupId>
+                <artifactId>vertx-dependencies</artifactId>
+                <version>${stack.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-webflux</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.junit.vintage</groupId>
+                    <artifactId>junit-vintage-engine</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.qpid</groupId>
+            <artifactId>proton-j</artifactId>
+            <version>${proton.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-proton</artifactId>
+            <version>${stack.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-unit</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.reactivestreams</groupId>
+            <artifactId>reactive-streams-tck</artifactId>
+            <version>${rs.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.reactivex.rxjava2</groupId>
+            <artifactId>rxjava</artifactId>
+            <version>${rx.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- codegen -->
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-codegen</artifactId>
+            <classifier>processor</classifier>
+            <scope>provided</scope>
+        </dependency>
+        <!-- doc -->
+        <dependency>
+            <groupId>io.vertx</groupId>
+            <artifactId>vertx-docgen</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>${spring.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                        <configuration>
+                            <mainClass>com.bosch.iot.things.example.message.processor.MessageProcessorApplication</mainClass>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/ApplicationConfiguration.java

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+package com.bosch.iot.things.example.message.processor;
+
+import com.bosch.iot.things.example.message.processor.transport.AmqpClient;
+import com.bosch.iot.things.example.message.processor.transport.AmqpServer;
+import io.vertx.core.Vertx;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.DependsOn;
+
+@Configuration
+public class ApplicationConfiguration {
+
+    @Bean
+    public Vertx vertx() { return Vertx.vertx(); }
+
+    @Bean
+    @DependsOn("client")
+    public AmqpServer server(){ return new AmqpServer(); }
+
+    @Bean
+    public AmqpClient client(){ return new AmqpClient(); }
+
+}

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/MessageProcessorApplication.java

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+package com.bosch.iot.things.example.message.processor;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MessageProcessorApplication {
+	public static void main(String[] args) {
+		SpringApplication.run(MessageProcessorApplication.class, args);
+	}
+}

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/downstream/ThingsToHubFlow.java

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+package com.bosch.iot.things.example.message.processor.downstream;
+
+import com.bosch.iot.things.example.message.processor.processing.MessageProcessor;
+import com.bosch.iot.things.example.message.processor.transport.AmqpClient;
+import com.bosch.iot.things.example.message.processor.utils.Utils;
+import io.vertx.proton.ProtonSender;
+import org.apache.qpid.proton.message.Message;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+
+@Component
+public class ThingsToHubFlow {
+
+    private static final Logger log = LoggerFactory.getLogger(ThingsToHubFlow.class);
+
+    @Autowired
+    private volatile AmqpClient amqpClient;
+
+    @Autowired
+    private Utils utils;
+
+    @Autowired
+    private MessageProcessor messageProcessingService;
+
+    private Map<String, ProtonSender> hubSenders = new HashMap<>();
+
+    public void init(Set<String> thingsReceiverAddresses) {
+        thingsReceiverAddresses.forEach(address -> {
+            ProtonSender hubSender = amqpClient.getHubConnection().createSender(address);
+            hubSender.open();
+            hubSenders.put(address, hubSender);
+            log.info("Hub sender created for: " + address);
+        });
+    }
+
+    public void forwardToHub(Message msg, String address) {
+        log.debug("Sending message to HUB service");
+        Message processedMessage = this.messageProcessingService.decrypt(msg);
+        utils.logMessageInfo(msg, address);
+        ProtonSender hubSender = hubSenders.get(address);
+        hubSender.send(processedMessage, delivery -> {
+            log.info(String.format("The message was received by the HUB service: remote state=%s, remotely settled=%s",
+                    delivery.getRemoteState(), delivery.remotelySettled()));
+        });
+    }
+}

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/processing/MessageProcessingService.java

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+package com.bosch.iot.things.example.message.processor.processing;
+
+import org.apache.qpid.proton.amqp.Binary;
+import org.apache.qpid.proton.amqp.messaging.AmqpValue;
+import org.apache.qpid.proton.amqp.messaging.Data;
+import org.apache.qpid.proton.amqp.messaging.Section;
+import org.apache.qpid.proton.message.Message;
+import org.springframework.stereotype.Service;
+
+@Service
+public class MessageProcessingService implements MessageProcessor{
+
+    @Override
+    public Message encrypt(Message message) { return getProcessedMessage(message); }
+
+    @Override
+    public Message decrypt(Message message) { return getProcessedMessage(message); }
+
+    public Message getProcessedMessage(Message message) {
+        Section body = message.getBody();
+        if (body instanceof Data) {
+            String msgString = ((Data) body).getValue().toString();
+            //Simple modification of payload
+            String modifiedBody = msgString.replaceAll("60", "70");
+            message.setBody((new Data(new Binary(modifiedBody.getBytes()))));
+        } else if (body instanceof AmqpValue) {
+            String msgString = ((AmqpValue) body).getValue().toString();
+            //Simple modification of payload
+            String modifiedBody = msgString.replaceAll("60", "70");
+            message.setBody(new AmqpValue(modifiedBody));
+        }
+        return message;
+    }
+}

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/processing/MessageProcessor.java

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+package com.bosch.iot.things.example.message.processor.processing;
+
+import org.apache.qpid.proton.message.Message;
+
+public interface MessageProcessor {
+    Message encrypt(Message message);
+
+    Message decrypt(Message message);
+}

message-processor/src/main/java/com/bosch/iot/things/example/message/processor/transport/AmqpClient.java

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+package com.bosch.iot.things.example.message.processor.transport;
+
+import io.vertx.core.Future;
+import io.vertx.core.Promise;
+import io.vertx.core.Vertx;
+import io.vertx.proton.ProtonClient;
+import io.vertx.proton.ProtonClientOptions;
+import io.vertx.proton.ProtonConnection;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+
+import javax.annotation.PostConstruct;
+import java.util.Objects;
+
+public class AmqpClient {
+
+    private static final Logger log = LoggerFactory.getLogger(AmqpClient.class);
+
+    @Autowired
+    private Vertx vertx;
+
+    @Value(value = "${hub.host}")
+    private String hubHost;
+
+    @Value(value = "${hub.port}")
+    private Integer hubPort;
+
+    @Value(value = "${hub.username}")
+    private String hubUsername;
+
+    @Value(value = "${hub.password}")
+    private String hubPassword;
+
+    private ProtonClient hubClient;
+    private ProtonConnection hubConnection;
+
+    @PostConstruct
+    private void start() {
+        setHubClient(ProtonClient.create(vertx));
+    }
+
+    private Future<ProtonConnection> connectHubClient() {
+        Promise<ProtonConnection> promise = Promise.promise();
+        hubClient.connect(new ProtonClientOptions().setSsl(Boolean.TRUE), hubHost, hubPort, hubUsername, hubPassword, res -> {
+            if (res.succeeded()) {
+                log.info("Connected to Hub server!");
+                setHubConnection(res.result());
+                hubConnection.open();
+                promise.complete();
+            } else {
+                log.error(String.format("Error connecting to Hub server! Cause - %s", res.cause().getMessage()));
+                promise.fail(res.cause());
+            }
+        });
+        return promise.future();
+    }
+
+    public Future<ProtonConnection> requestHubConnection() {
+        if (Objects.isNull(this.getHubConnection())) {
+            return this.connectHubClient();
+        }
+        return Future.succeededFuture();
+    }
+
+    public void disconnectFromHub() {
+        if (Objects.nonNull(this.getHubConnection()) && !this.getHubConnection().isDisconnected()) {
+            getHubConnection().close().disconnect();
+            setHubConnection(null);
+            log.info("Disconnected from Hub server!");
+        }
+    }
+
+    public ProtonClient getHubClient() {
+        return hubClient;
+    }
+
+    private void setHubClient(ProtonClient hubClient) {
+        this.hubClient = hubClient;
+    }
+
+    public ProtonConnection getHubConnection() {
+        return hubConnection;
+    }
+
+    private void setHubConnection(ProtonConnection hubConnection) {
+        this.hubConnection = hubConnection;
+    }
+
+}