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The Microsoft Azure IoT Service SDK for Java
/*
* Copyright (c) Microsoft. All rights reserved.
* Licensed under the MIT license. See LICENSE file in the project root for full license information.
*/
package com.microsoft.azure.iot.service.transport.amqps;
import com.microsoft.azure.iot.service.sdk.Message;
import com.microsoft.azure.iot.service.sdk.Tools;
import com.microsoft.azure.iot.service.transport.TransportUtils;
import org.apache.qpid.proton.Proton;
import org.apache.qpid.proton.amqp.Binary;
import org.apache.qpid.proton.amqp.Symbol;
import org.apache.qpid.proton.amqp.messaging.*;
import org.apache.qpid.proton.engine.*;
import org.apache.qpid.proton.messenger.impl.Address;
import org.apache.qpid.proton.reactor.Handshaker;
import java.nio.BufferOverflowException;
import java.util.HashMap;
import java.util.Map;
/**
* Instance of the QPID-Proton-J BaseHandler class to override
* the events what are needed to handle the send operation
* Contains and sets connection parameters (path, port, endpoint)
* Maintains the layers of AMQP protocol (Link, Session, Connection, Transport)
* Creates and sets SASL authentication for transport
*/
public class AmqpSendHandler extends BaseHandler
{
public static final String SEND_TAG = "sender";
public static final String SEND_PORT = ":5671";
public static final String ENDPOINT = "/messages/devicebound";
public static final String DEVICE_PATH_FORMAT = "/devices/%s/messages/devicebound";
protected final String hostName;
protected final String userName;
protected final String sasToken;
protected org.apache.qpid.proton.message.Message protonMessage;
private int nextTag = 0;
/**
* Constructor to set up connection parameters and initialize handshaker for transport
*
* @param hostName The address string of the service (example: AAA.BBB.CCC)
* @param userName The username string to use SASL authentication (example: [email protected])
* @param sasToken The SAS token string
*/
public AmqpSendHandler(String hostName, String userName, String sasToken)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_001: [The constructor shall throw IllegalArgumentException if any of the input parameter is null or empty]
if (Tools.isNullOrEmpty(hostName))
{
throw new IllegalArgumentException("hostName can not be null or empty");
}
if (Tools.isNullOrEmpty(userName))
{
throw new IllegalArgumentException("userName can not be null or empty");
}
if (Tools.isNullOrEmpty(sasToken))
{
throw new IllegalArgumentException("sasToken can not be null or empty");
}
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_002: [The constructor shall copy all input parameters to private member variables for event processing]
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_003: [The constructor shall concatenate the host name with the port]
this.hostName = hostName + SEND_PORT;
this.userName = userName;
this.sasToken = sasToken;
// Add a child handler that performs some default handshaking behaviour.
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_004: [The constructor shall initialize a new Handshaker (Proton) object to handle communication handshake]
add(new Handshaker());
}
/**
* Create "to" parameter for AMQP message to address the device
* @param deviceId device name string
* @return full path tot he device
*/
private String buildToDevicePath(String deviceId)
{
return String.format(DEVICE_PATH_FORMAT, deviceId);
}
/**
* Create Proton message from deviceId and content string
* @param deviceId The device name string
* @param message The message to be sent
*/
public void createProtonMessage(String deviceId, Message message)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_005: [The function shall create a new Message (Proton) object]
this.protonMessage = Proton.message();
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_006: [The function shall set
// the standard properties on the Proton Message object]
Properties properties = new Properties();
properties.setMessageId(message.getMessageId());
properties.setTo(buildToDevicePath(deviceId));
properties.setAbsoluteExpiryTime(message.getExpiryTimeUtc());
properties.setCorrelationId(message.getCorrelationId());
if (message.getUserId() != null)
{
properties.setUserId(new Binary(message.getUserId().getBytes()));
}
this.protonMessage.setProperties(properties);
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_023: [The function shall set
// the application properties on the Proton Message object]
if (message.getProperties() != null && message.getProperties().size() > 0)
{
Map applicationPropertiesMap = new HashMap<>(message.getProperties().size());
for(Map.Entry entry : message.getProperties().entrySet())
{
applicationPropertiesMap.put(entry.getKey(), entry.getValue());
}
ApplicationProperties applicationProperties = new ApplicationProperties(applicationPropertiesMap);
this.protonMessage.setApplicationProperties(applicationProperties);
}
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_007: [The function shall create a Binary (Proton) object from the content string]
Binary binary = new Binary(message.getBytes());
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_008: [The function shall create a data Section (Proton) object from the Binary]
Section section = new Data(binary);
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_009: [The function shall set the Message body to the created data section]
this.protonMessage.setBody(section);
}
/**
* Create Proton SslDomain object from Address using the given Ssl mode
* @param address The proton address object
* @param mode The proton enum value of requested Ssl mode
* @return The created Ssl domain
*/
private SslDomain makeDomain(Address address, SslDomain.Mode mode)
{
SslDomain domain = Proton.sslDomain();
domain.init(mode);
return domain;
}
/**
* Event handler for the connection bound event
* @param event The proton event object
*/
@Override
public void onConnectionBound(Event event)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_010: [The event handler shall set the SASL PLAIN authentication on the Transport using the given user name and sas token]
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_011: [The event handler shall set ANONYMUS_PEER authentication mode on the domain of the Transport]
Transport transport = event.getConnection().getTransport();
if (transport != null)
{
Sasl sasl = transport.sasl();
sasl.plain(this.userName, this.sasToken);
Address address = new Address(this.hostName);
SslDomain domain = makeDomain(address, SslDomain.Mode.CLIENT);
domain.setPeerAuthentication(SslDomain.VerifyMode.ANONYMOUS_PEER);
Ssl ssl = transport.ssl(domain);
}
}
/**
* Event handler for the connection init event
* @param event The proton event object
*/
@Override
public void onConnectionInit(Event event)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_012: [The event handler shall set the host name on the connection]
Connection conn = event.getConnection();
conn.setHostname(hostName);
// Every session or link could have their own handler(s) if we
// wanted simply by adding the handler to the given session
// or link
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_013: [The event handler shall create a Session (Proton) object from the connection]
Session ssn = conn.session();
// If a link doesn't have an event handler, the events go to
// its parent session. If the session doesn't have a handler
// the events go to its parent connection. If the connection
// doesn't have a handler, the events go to the reactor.
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_014: [The event handler shall create a Sender (Proton) object and set the protocol tag on it to a predefined constant]
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_15_023: [The Sender object shall have the properties set to service client version identifier.]
Map properties = new HashMap<>();
properties.put(Symbol.getSymbol(TransportUtils.versionIdentifierKey), TransportUtils.javaServiceClientIdentifier + TransportUtils.serviceVersion);
Sender snd = ssn.sender(SEND_TAG);
snd.setProperties(properties);
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_015: [The event handler shall open the Connection, the Session and the Sender object]
conn.open();
ssn.open();
snd.open();
}
/**
* Event handler for the link init event
* @param event The proton event object
*/
@Override
public void onLinkInit(Event event)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_016: [The event handler shall create a new Target (Proton) object using the given endpoint address]
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_017: [The event handler shall get the Link (Proton) object and set its target to the created Target (Proton) object]
Link link = event.getLink();
Target t = new Target();
t.setAddress(ENDPOINT);
link.setTarget(t);
}
/**
* Event handler for the link flow event
* @param event The proton event object
*/
@Override
public void onLinkFlow(Event event)
{
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_018: [The event handler shall get the Sender (Proton) object from the link]
Sender snd = (Sender)event.getLink();
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_019: [The event handler shall encode the message and copy to the byte buffer]
if (snd.getCredit() > 0)
{
byte[] msgData = new byte[1024];
int length;
while(true)
{
try
{
length = this.protonMessage.encode(msgData, 0, msgData.length);
break;
} catch(BufferOverflowException e)
{
msgData = new byte[msgData.length * 2];
}
}
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_020: [The event handler shall set the delivery tag on the Sender (Proton) object]
byte[] tag = String.valueOf(nextTag++).getBytes();
Delivery dlv = snd.delivery(tag);
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_021: [The event handler shall send the encoded bytes]
snd.send(msgData, 0, length);
// Codes_SRS_SERVICE_SDK_JAVA_AMQPSENDHANDLER_12_022: [The event handler shall close the Sender, Session and Connection]
dlv.settle();
snd.advance();
snd.close();
snd.getSession().close();
snd.getSession().getConnection().close();
}
}
}
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