nandorsoma commented on code in PR #6225: URL: https://github.com/apache/nifi/pull/6225#discussion_r957817646
########## nifi-nar-bundles/nifi-mqtt-bundle/nifi-mqtt-processors/src/main/java/org/apache/nifi/processors/mqtt/adapters/HiveMqV5ClientAdapter.java: ########## @@ -0,0 +1,200 @@ +/* + * 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.nifi.processors.mqtt.adapters; + +import com.hivemq.client.mqtt.datatypes.MqttQos; +import com.hivemq.client.mqtt.mqtt5.Mqtt5BlockingClient; +import com.hivemq.client.mqtt.mqtt5.Mqtt5Client; +import com.hivemq.client.mqtt.mqtt5.Mqtt5ClientBuilder; +import com.hivemq.client.mqtt.mqtt5.message.connect.Mqtt5Connect; +import com.hivemq.client.mqtt.mqtt5.message.connect.Mqtt5ConnectBuilder; +import com.hivemq.client.mqtt.mqtt5.message.subscribe.suback.Mqtt5SubAck; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.processors.mqtt.common.MqttCallback; +import org.apache.nifi.processors.mqtt.common.MqttClient; +import org.apache.nifi.processors.mqtt.common.MqttClientProperties; +import org.apache.nifi.processors.mqtt.common.MqttException; +import org.apache.nifi.processors.mqtt.common.ReceivedMqttMessage; +import org.apache.nifi.processors.mqtt.common.StandardMqttMessage; +import org.apache.nifi.security.util.KeyStoreUtils; +import org.apache.nifi.security.util.TlsException; + +import java.nio.charset.StandardCharsets; +import java.util.Objects; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.TimeUnit; + +import static org.apache.nifi.processors.mqtt.common.MqttProtocolScheme.SSL; +import static org.apache.nifi.processors.mqtt.common.MqttProtocolScheme.WS; +import static org.apache.nifi.processors.mqtt.common.MqttProtocolScheme.WSS; + +public class HiveMqV5ClientAdapter implements MqttClient { + + private final Mqtt5BlockingClient mqtt5BlockingClient; + private final MqttClientProperties clientProperties; + private final ComponentLog logger; + + private MqttCallback callback; + + public HiveMqV5ClientAdapter(MqttClientProperties clientProperties, ComponentLog logger) throws TlsException { + this.mqtt5BlockingClient = createClient(clientProperties, logger); + this.clientProperties = clientProperties; + this.logger = logger; + } + + @Override + public boolean isConnected() { + return mqtt5BlockingClient.getState().isConnected(); + } + + @Override + public void connect() { + logger.debug("Connecting to broker"); + + final Mqtt5ConnectBuilder connectBuilder = Mqtt5Connect.builder() + .keepAlive(clientProperties.getKeepAliveInterval()); + + final boolean cleanSession = clientProperties.isCleanSession(); + connectBuilder.cleanStart(cleanSession); + if (!cleanSession) { + connectBuilder.sessionExpiryInterval(clientProperties.getSessionExpiryInterval()); + } + + final String lastWillTopic = clientProperties.getLastWillTopic(); + if (lastWillTopic != null) { + connectBuilder.willPublish() + .topic(lastWillTopic) + .payload(clientProperties.getLastWillMessage().getBytes()) + .retain(clientProperties.getLastWillRetain()) + .qos(MqttQos.fromCode(clientProperties.getLastWillQos())) + .applyWillPublish(); + } + + final String username = clientProperties.getUsername(); + final String password = clientProperties.getPassword(); + if (username != null && password != null) { + connectBuilder.simpleAuth() + .username(clientProperties.getUsername()) + .password(password.getBytes(StandardCharsets.UTF_8)) + .applySimpleAuth(); + } + + final Mqtt5Connect mqtt5Connect = connectBuilder.build(); + mqtt5BlockingClient.connect(mqtt5Connect); + } + + @Override + public void disconnect() { + logger.debug("Disconnecting client"); + // Currently it is not possible to set timeout for disconnect with HiveMQ Client. + mqtt5BlockingClient.disconnect(); + } + + @Override + public void close() { + // there is no paho's close equivalent in hivemq client + } + + @Override + public void publish(String topic, StandardMqttMessage message) { + logger.debug("Publishing message to {} with QoS: {}", topic, message.getQos()); + + mqtt5BlockingClient.publishWith() + .topic(topic) + .payload(message.getPayload()) + .retain(message.isRetained()) + .qos(Objects.requireNonNull(MqttQos.fromCode(message.getQos()))) + .send(); + } + + @Override + public void subscribe(String topicFilter, int qos) { + Objects.requireNonNull(callback, "callback should be set"); + + logger.debug("Subscribing to {} with QoS: {}", topicFilter, qos); + + CompletableFuture<Mqtt5SubAck> futureAck = mqtt5BlockingClient.toAsync().subscribeWith() + .topicFilter(topicFilter) + .qos(Objects.requireNonNull(MqttQos.fromCode(qos))) + .callback(mqtt5Publish -> { + final ReceivedMqttMessage receivedMessage = new ReceivedMqttMessage( + mqtt5Publish.getPayloadAsBytes(), + mqtt5Publish.getQos().getCode(), + mqtt5Publish.isRetain(), + mqtt5Publish.getTopic().toString()); + callback.messageArrived(receivedMessage); + }) + .send(); + + // Setting "listener" callback is only possible with async client, though sending subscribe message + // should happen in a blocking way to make sure the processor is blocked until ack is not arrived. + try { + Mqtt5SubAck ack = futureAck.get(clientProperties.getConnectionTimeout(), TimeUnit.SECONDS); + logger.debug("Received mqtt5 subscribe ack: {}", ack.toString()); 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