ijokarumawak commented on a change in pull request #3344: NIFI-6092 Create ListenSlack and FetchSlack processors URL: https://github.com/apache/nifi/pull/3344#discussion_r265468413
########## File path: nifi-nar-bundles/nifi-slack-bundle/nifi-slack-processors/src/main/java/org/apache/nifi/processors/slack/ListenSlack.java ########## @@ -0,0 +1,199 @@ +/* + * 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.slack; + +import java.io.StringReader; +import java.util.Arrays; +import java.util.Collections; +import java.util.HashSet; +import java.util.List; +import java.util.Objects; +import java.util.Optional; +import java.util.Set; +import java.util.function.Consumer; + +import javax.json.Json; +import javax.json.JsonException; +import javax.json.JsonReader; + +import org.apache.nifi.annotation.behavior.InputRequirement; +import org.apache.nifi.annotation.behavior.InputRequirement.Requirement; +import org.apache.nifi.annotation.documentation.CapabilityDescription; +import org.apache.nifi.annotation.documentation.SeeAlso; +import org.apache.nifi.annotation.documentation.Tags; +import org.apache.nifi.annotation.lifecycle.OnScheduled; +import org.apache.nifi.annotation.lifecycle.OnShutdown; +import org.apache.nifi.annotation.lifecycle.OnUnscheduled; +import org.apache.nifi.components.PropertyDescriptor; +import org.apache.nifi.components.Validator; +import org.apache.nifi.flowfile.FlowFile; +import org.apache.nifi.processor.AbstractSessionFactoryProcessor; +import org.apache.nifi.processor.ProcessContext; +import org.apache.nifi.processor.ProcessSession; +import org.apache.nifi.processor.ProcessSessionFactory; +import org.apache.nifi.processor.Relationship; +import org.apache.nifi.processor.exception.ProcessException; +import org.apache.nifi.processors.slack.controllers.SlackConnectionService; + +@Tags({"slack", "listen", "json", "events"}) +@CapabilityDescription("Listens on the provided slack connection controller service and " + + "forwards the messages in JSON text format.") +@SeeAlso({SlackConnectionService.class, FetchSlack.class}) +@InputRequirement(Requirement.INPUT_FORBIDDEN) +public class ListenSlack extends AbstractSessionFactoryProcessor { + + private volatile ProcessSessionFactory processSessionFactory; + + private volatile SlackConnectionService slackConnectionService; + + private volatile List<String> matchingTypes; + + private volatile boolean matchAny; + + static final PropertyDescriptor SLACK_CONNECTION_SERVICE = new PropertyDescriptor.Builder() + .name("slack-connection-service") + .displayName("Slack Connection ControllerService") + .description("A ControllerService that provides a connection to slack service.") + .required(true) + .identifiesControllerService(SlackConnectionService.class) + .build(); + + static final PropertyDescriptor MESSAGE_TYPES = new PropertyDescriptor + .Builder() + .name("message-types") + .displayName("Message types") + .description("Message types to listen to. It will filter messages with the given types or " + + "listen to every type if empty. It is a coma separated list like: message,file_shared") + .required(false) + .addValidator(Validator.VALID) + .build(); + + static final Relationship MATCHED_MESSAGES_RELATIONSHIP = new Relationship.Builder() + .name("matched") + .description("Incoming messages that matches the given types") + .build(); + + static final Relationship UNMATCHED_MESSAGES_RELATIONSHIP = new Relationship.Builder() + .name("unmatched") + .description("Incoming messages that does not match the given types") + .autoTerminateDefault(true) + .build(); + + private static final String JSON_OBJECT_TYPE_KEY = "type"; + + private static final List<PropertyDescriptor> DESCRIPTORS = Collections.unmodifiableList(Arrays.asList( + SLACK_CONNECTION_SERVICE, MESSAGE_TYPES)); + + private static final Set<Relationship> RELATIONSHIPS = Collections.unmodifiableSet(new HashSet<>(Arrays.asList( + MATCHED_MESSAGES_RELATIONSHIP, UNMATCHED_MESSAGES_RELATIONSHIP))); + + @Override + public Set<Relationship> getRelationships() { + return RELATIONSHIPS; + } + + @Override + public final List<PropertyDescriptor> getSupportedPropertyDescriptors() { + return DESCRIPTORS; + } + + @OnScheduled + public void onScheduled(final ProcessContext context) { + String messageTypes = context.getProperty(MESSAGE_TYPES).getValue(); + messageTypes = messageTypes == null ? "" : messageTypes; + matchAny = messageTypes.isEmpty(); + matchingTypes = Arrays.asList(messageTypes.split(",")); + } + + @OnUnscheduled + @OnShutdown + public void onUnscheduled() { + if (isProcessorRegisteredToService()) { + deregister(); + } + } + + private void deregister() { + slackConnectionService.deregisterProcessor(this); + } + + @Override + public void onTrigger(ProcessContext context, ProcessSessionFactory sessionFactory) throws ProcessException { + if (processSessionFactory == null) { + processSessionFactory = sessionFactory; + } + if (!isProcessorRegisteredToService()) { + registerProcessorToService(context); + } + context.yield(); + } + + private boolean isProcessorRegisteredToService() { + return slackConnectionService != null + && slackConnectionService.isProcessorRegistered(this); + } + + private void registerProcessorToService(ProcessContext context) { + try { + slackConnectionService = context.getProperty(SLACK_CONNECTION_SERVICE) + .asControllerService(SlackConnectionService.class); + slackConnectionService.registerProcessor(this, getMessageHandler(processSessionFactory)); + } catch (Exception e) { + getLogger().error("Error while creating slack client", e); + slackConnectionService.deregisterProcessor(this); + context.yield(); + } + } + + private Consumer<String> getMessageHandler(ProcessSessionFactory sessionFactory) { + return message -> { + ProcessSession session = sessionFactory.createSession(); + try { + FlowFile flowFile = session.create(); + session.write(flowFile, outputStream -> outputStream.write(message.getBytes())); Review comment: Please add 'mime.type' attribute as 'application/json' ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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