/*
* Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
* WSO2 Inc. licenses this file to you 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.wso2.carbon.inbound.endpoint.protocol.mqtt;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.util.UUIDGenerator;
import org.apache.axis2.AxisFault;
import org.apache.axis2.builder.Builder;
import org.apache.axis2.builder.BuilderUtil;
import org.apache.axis2.builder.SOAPBuilder;
import org.apache.axis2.context.MessageContext;
import org.apache.axis2.transport.TransportUtils;
import org.apache.commons.io.input.AutoCloseInputStream;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.core.SynapseEnvironment;
import org.apache.synapse.core.axis2.Axis2MessageContext;
import org.apache.synapse.inbound.InboundEndpoint;
import org.apache.synapse.mediators.base.SequenceMediator;
import org.apache.synapse.transport.customlogsetter.CustomLogSetter;
import org.eclipse.paho.client.mqttv3.MqttMessage;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
/**
* Inject mqtt message into the sequence
*/
public class MqttInjectHandler {
private static final Log log = LogFactory.getLog(MqttInjectHandler.class);
private String injectingSeq;
private String onErrorSeq;
private boolean sequential;
private String contentType;
private SynapseEnvironment synapseEnvironment;
/**
* constructor initialize parameters and synapseEnvironment
*
* @param injectingSeq
* @param onErrorSeq
* @param sequential
* @param synapseEnvironment
*/
public MqttInjectHandler(String injectingSeq, String onErrorSeq,
boolean sequential, SynapseEnvironment synapseEnvironment,
String contentType) {
this.injectingSeq = injectingSeq;
this.onErrorSeq = onErrorSeq;
this.sequential = sequential;
this.synapseEnvironment = synapseEnvironment;
this.contentType = contentType;
}
/**
* inject mqtt message into esb sequence
*
* @param mqttMessage
* @return
*/
public boolean invoke(MqttMessage mqttMessage, String name, String topicName) {
try {
org.apache.synapse.MessageContext msgCtx = createMessageContext();
msgCtx.setProperty(MqttConstants.MQTT_TOPIC_NAME, topicName);
if (name != null) {
InboundEndpoint inboundEndpoint = msgCtx.getConfiguration().getInboundEndpoint(name);
CustomLogSetter.getInstance().setLogAppender(inboundEndpoint.getArtifactContainerName());
}
String message = mqttMessage.toString();
if (log.isDebugEnabled()) {
log.debug("Processed MQTT Message of Content-type : "
+ contentType);
}
MessageContext axis2MsgCtx =
((org.apache.synapse.core.axis2.Axis2MessageContext) msgCtx)
.getAxis2MessageContext();
// Determine the message builder to use
Builder builder = null;
if (contentType == null) {
log.debug("No content type specified. Using SOAP builder.");
builder = new SOAPBuilder();
} else {
int index = contentType.indexOf(';');
String type = index > 0 ? contentType.substring(0, index)
: contentType;
try {
builder = BuilderUtil.getBuilderFromSelector(type, axis2MsgCtx);
} catch (AxisFault axisFault) {
log.error("Error while creating message builder :: "
+ axisFault.getMessage());
}
if (builder == null) {
if (log.isDebugEnabled()) {
log.debug("No message builder found for type '" + type
+ "'. Falling back to SOAP.");
}
builder = new SOAPBuilder();
}
}
OMElement documentElement = null;
InputStream in = new AutoCloseInputStream(new ByteArrayInputStream(
message.getBytes()));
documentElement = builder.processDocument(in, contentType,
axis2MsgCtx);
// Inject the message to the sequence.
msgCtx.setEnvelope(TransportUtils
.createSOAPEnvelope(documentElement));
if (injectingSeq == null || ("").equals(injectingSeq)) {
log.error("Sequence name not specified. Sequence : "
+ injectingSeq);
return false;
}
SequenceMediator seq = (SequenceMediator) synapseEnvironment
.getSynapseConfiguration().getSequence(injectingSeq);
if (seq != null) {
if (!seq.isInitialized()) {
seq.init(synapseEnvironment);
}
seq.setErrorHandler(onErrorSeq);
if (log.isDebugEnabled()) {
log.debug("injecting message to sequence : " + injectingSeq);
}
if (!synapseEnvironment.injectInbound(msgCtx, seq, this.sequential)) {
return false;
}
} else {
log.error("Sequence: " + injectingSeq + " not found");
}
} catch (Exception e) {
log.error("Error while processing the MQTT Message");
}
return true;
}
/**
* Create the initial message context
*/
private org.apache.synapse.MessageContext createMessageContext() {
org.apache.synapse.MessageContext msgCtx = synapseEnvironment
.createMessageContext();
MessageContext axis2MsgCtx = ((org.apache.synapse.core.axis2.Axis2MessageContext) msgCtx)
.getAxis2MessageContext();
axis2MsgCtx.setServerSide(true);
axis2MsgCtx.setMessageID(UUIDGenerator.getUUID());
msgCtx.setProperty(MessageContext.CLIENT_API_NON_BLOCKING, true);
return msgCtx;
}
}