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https://issues.apache.org/jira/browse/STORM-1406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15085770#comment-15085770
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ASF GitHub Bot commented on STORM-1406:
---------------------------------------
Github user ptgoetz commented on a diff in the pull request:
https://github.com/apache/storm/pull/991#discussion_r48976420
--- Diff:
external/storm-mqtt/core/src/main/java/org/apache/storm/mqtt/bolt/MqttBolt.java
---
@@ -0,0 +1,108 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF 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.apache.storm.mqtt.bolt;
+
+import backtype.storm.Config;
+import backtype.storm.task.OutputCollector;
+import backtype.storm.task.TopologyContext;
+import backtype.storm.topology.OutputFieldsDeclarer;
+import backtype.storm.topology.base.BaseRichBolt;
+import backtype.storm.tuple.Tuple;
+import backtype.storm.utils.TupleUtils;
+import org.apache.storm.mqtt.MqttMessage;
+import org.apache.storm.mqtt.common.MqttOptions;
+import org.apache.storm.mqtt.MqttTupleMapper;
+import org.apache.storm.mqtt.common.MqttPublisher;
+import org.apache.storm.mqtt.common.SslUtils;
+import org.apache.storm.mqtt.ssl.KeyStoreLoader;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Map;
+
+
+public class MqttBolt extends BaseRichBolt {
+ private static final Logger LOG =
LoggerFactory.getLogger(MqttBolt.class);
+ private MqttTupleMapper mapper;
+ private transient MqttPublisher publisher;
+ private boolean retain = false;
+ private transient OutputCollector collector;
+ private MqttOptions options;
+ private KeyStoreLoader keyStoreLoader;
+ private transient String topologyName;
+
+
+ public MqttBolt(MqttOptions options, MqttTupleMapper mapper){
+ this(options, mapper, null, false);
+ }
+
+ public MqttBolt(MqttOptions options, MqttTupleMapper mapper, boolean
retain){
+ this(options, mapper, null, retain);
+ }
+
+ public MqttBolt(MqttOptions options, MqttTupleMapper mapper,
KeyStoreLoader keyStoreLoader){
+ this(options, mapper, keyStoreLoader, false);
+ }
+
+ public MqttBolt(MqttOptions options, MqttTupleMapper mapper,
KeyStoreLoader keyStoreLoader, boolean retain){
+ this.options = options;
+ this.mapper = mapper;
+ this.retain = retain;
+ this.keyStoreLoader = keyStoreLoader;
+ // the following code is duplicated in the constructor of
MqttPublisher
+ // we reproduce it here so we fail on the client side if SSL is
misconfigured, rather than when the topology
+ // is deployed to the cluster
+ SslUtils.checkSslConfig(this.options.getUrl(), keyStoreLoader);
+ }
+
+ @Override
+ public void prepare(Map conf, TopologyContext context, OutputCollector
collector) {
+ this.collector = collector;
+ this.topologyName = (String)conf.get(Config.TOPOLOGY_NAME);
+ this.publisher = new MqttPublisher(this.options,
this.keyStoreLoader, this.retain);
+ try {
+ this.publisher.connectMqtt(this.topologyName + "-" +
context.getThisComponentId() + "-" + context.getThisTaskId());
+ } catch (Exception e) {
+ LOG.error("Unable to connect to MQTT Broker.", e);
+ throw new RuntimeException("Unable to connect to MQTT
Broker.", e);
+ }
+ }
+
+ @Override
+ public void execute(Tuple input) {
+ //ignore tick tuples
+ if(!TupleUtils.isTick(input)){
+ MqttMessage message = this.mapper.toMessage(input);
+ try {
+ this.publisher.publish(message, this.retain);
+ this.collector.ack(input);
+ } catch (Exception e) {
+ LOG.warn("Error publishing MQTT message. Failing tuple.",
e);
+ // should we fail the tuple or kill the worker?
--- End diff --
Good call.
> MQTT Support
> ------------
>
> Key: STORM-1406
> URL: https://issues.apache.org/jira/browse/STORM-1406
> Project: Apache Storm
> Issue Type: Improvement
> Reporter: P. Taylor Goetz
> Assignee: P. Taylor Goetz
>
> MQTT is a lightweight publish/subscribe protocol frequently used in IoT
> applications.
> Further information can be found at http://mqtt.org
> Initial features include:
> * Full MQTT support (e.g. last will, QoS 0-2, retain, etc.)
> * Spout implementation(s) for subscribing to MQTT topics
> * A bolt implementation for publishing MQTT messages
> * A trident function implementation for publishing MQTT messages
> * Authentication and TLS/SSL support
> * User-defined "mappers" for converting MQTT messages to tuples (subscribers)
> * User-defined "mappers" for converting tuples to MQTT messages (publishers)
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