MQTT ke template Pub/Sub

Template MQTT ke Pub/Sub adalah pipeline streaming yang membaca pesan dari topik MQTT dan menulisnya ke Pub/Sub. Ini mencakup parameter opsional username dan password jika autentikasi diperlukan oleh server MQTT.

Persyaratan Pipeline

Nama topik output Pub/Sub harus ada.
IP host MQTT harus ada dan memiliki konfigurasi jaringan yang tepat agar mesin pekerja dapat mencapai host MQTT.
Topik MQTT tempat data yang diekstrak harus memiliki nama.

Parameter template

Parameter	Deskripsi
`brokerServer`	IP atau host server perantara MQTT. Misalnya, `tcp://10.0.0.1:1883`.
`inputTopic`	Nama topik MQTT tempat data dibaca.
`outputTopic`	Nama topik Pub/Sub output tempat data ditulis.
`username`	(Opsional) Nama pengguna yang akan digunakan untuk autentikasi di server MQTT.
`password`	(Opsional) Sandi yang terkait dengan nama pengguna yang diberikan.

Menjalankan template

Konsol

Buka halaman Create job from template Dataflow.

Buka Buat tugas dari template

Di kolom Job name, masukkan nama pekerjaan yang unik.
Opsional: Untuk Endpoint regional, pilih nilai dari menu drop-down. Region default-nya adalah us-central1.
Untuk daftar region tempat Anda dapat menjalankan tugas Dataflow, lihat Lokasi Dataflow.
Dari menu drop-down Dataflow template, pilih MQTT to Pub/Sub template.
Di kolom parameter yang disediakan, masukkan parameter value Anda.
Klik Run job.

gcloud

Di shell atau terminal Anda, jalankan template:

gcloud dataflow flex-template run JOB_NAME \
    --project=YOUR_PROJECT_ID \
    --region=REGION_NAME \
    --template-file-gcs-location=gs://dataflow-templates-REGION_NAME/VERSION/flex/MQTT_To_Pubsub \
    --parameters \
brokerServer=MQTT_SERVER,\
inputTopic=INPUT_TOPIC,\
outputTopic=OUTPUT_TOPIC,\
username=USERNAME,\
password=PASSWORD

Anda harus mengganti nilai-nilai berikut dalam contoh ini:

Ganti YOUR_PROJECT_ID dengan project ID Anda.
Ganti dengan nama region Dataflow. Contoh: us-central1.
Ganti JOB_NAME dengan nama pekerjaan pilihan Anda. Nama tugas harus cocok dengan ekspresi reguler [a-z]([-a-z0-9]{0,38}[a-z0-9])? agar valid.
Ganti INPUT_TOPIC dengan nama topik input server MQTT. Contoh: testtopic.
Ganti MQTT_SERVER dengan alamat server MQTT. Contoh: tcp://10.128.0.62:1883
Ganti OUTPUT_TOPIC dengan nama topik output Pub/Sub. Contoh: projects/myproject/topics/testoutput.
Ganti USERNAME dengan nama pengguna untuk server MQTT. Contoh: testuser.
Ganti PASSWORD dengan sandi yang sesuai dengan nama pengguna yang digunakan di server MQTT.

API

Untuk menjalankan template menggunakan REST API, kirim permintaan HTTP POST. Untuk informasi selengkapnya tentang API dan cakupan otorisasinya, lihat projects.templates.launch.

POST https://dataflow.googleapis.com/v1b3/projects/PROJECT_ID/locations/LOCATION/flexTemplates:launch
{
   "launch_parameter": {
      "jobName": "JOB_NAME",
      "parameters": {
          "brokerServer": "MQTT_SERVER",
          "inputTopic": "INPUT_TOPIC",
          "outputTopic": "OUTPUT_TOPIC",
          "username": "USERNAME",
          "password": "PASSWORD"
      },
      "containerSpecGcsPath": "gs://dataflow-templates-LOCATION/VERSION/flex/MQTT_To_Pubsub",
   }
}

Anda harus mengganti nilai-nilai berikut dalam contoh ini:

Ganti YOUR_PROJECT_ID dengan project ID Anda.
Ganti dengan nama region Dataflow. Contoh: us-central1.
Ganti JOB_NAME dengan nama pekerjaan pilihan Anda. Nama tugas harus cocok dengan ekspresi reguler [a-z]([-a-z0-9]{0,38}[a-z0-9])? agar valid.
Ganti INPUT_TOPIC dengan nama topik input server MQTT. Contoh: testtopic.
Ganti MQTT_SERVER dengan alamat server MQTT. Contoh: tcp://10.128.0.62:1883
Ganti OUTPUT_TOPIC dengan nama topik output Pub/Sub. Contoh: projects/myproject/topics/testoutput.
Ganti USERNAME dengan nama pengguna untuk server MQTT. Contoh: testuser.
Ganti PASSWORD dengan sandi yang sesuai dengan nama pengguna yang digunakan di server MQTT.

Kode sumber template

Java

/*
 * Copyright (C) 2023 Google LLC
 *
 * Licensed 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 com.google.cloud.teleport.v2.templates;

import com.google.cloud.teleport.metadata.Template;
import com.google.cloud.teleport.metadata.TemplateCategory;
import com.google.cloud.teleport.metadata.TemplateParameter;
import java.nio.charset.StandardCharsets;
import org.apache.beam.sdk.Pipeline;
import org.apache.beam.sdk.PipelineResult;
import org.apache.beam.sdk.io.gcp.pubsub.PubsubIO;
import org.apache.beam.sdk.io.mqtt.MqttIO;
import org.apache.beam.sdk.options.PipelineOptions;
import org.apache.beam.sdk.options.PipelineOptionsFactory;
import org.apache.beam.sdk.options.Validation;
import org.apache.beam.sdk.transforms.DoFn;
import org.apache.beam.sdk.transforms.ParDo;

/**
 * Dataflow template which reads data from Mqtt Topic and writes it to Cloud PubSub.
 *
 * <p>Check out <a
 * href="https://github.com/GoogleCloudPlatform/DataflowTemplates/blob/main/v2/mqtt-to-pubsub/README_Mqtt_to_PubSub.md">README</a>
 * for instructions on how to use or modify this template.
 */
@Template(
    name = "Mqtt_to_PubSub",
    category = TemplateCategory.STREAMING,
    displayName = "MQTT to Pubsub",
    description =
        "The MQTT to Pub/Sub template is a streaming pipeline that reads messages from an MQTT topic and writes them to Pub/Sub. "
            + "It includes the optional parameters <code>username</code> and <code>password</code> in case authentication is required by the MQTT server.",
    optionsClass = MqttToPubsub.MqttToPubsubOptions.class,
    flexContainerName = "mqtt-to-pubsub",
    contactInformation = "https://cloud.google.com/support",
    documentation =
        "https://cloud.google.com/dataflow/docs/guides/templates/provided/mqtt-to-pubsub",
    preview = true,
    requirements = {
      "The Pub/Sub output topic name must exist.",
      "The MQTT host IP must exist and have the proper network configuration for worker machines to reach the MQTT host.",
      "The MQTT topic that data is extracted from must have a name."
    },
    streaming = true,
    supportsAtLeastOnce = true)
public class MqttToPubsub {

  /**
   * Runs a pipeline which reads data from Mqtt topic and writes it to Cloud PubSub.
   *
   * @param args arguments to the pipeline
   */
  public static void main(String[] args) {
    MqttToPubsubOptions options =
        PipelineOptionsFactory.fromArgs(args).withValidation().as(MqttToPubsubOptions.class);
    run(options);
  }

  public static void validate(MqttToPubsubOptions options) {
    if (options != null) {
      if ((options.getUsername() != null && !options.getUsername().isEmpty())
          && (options.getPassword() == null || options.getPassword().isBlank())) {
        throw new IllegalArgumentException(
            "While username is provided, password is required for authentication");
      }
    }
  }

  public static PipelineResult run(MqttToPubsubOptions options) {
    validate(options);
    Pipeline pipeline = Pipeline.create(options);
    MqttIO.Read mqttIo;
    if (!options.getUsername().isEmpty() || !options.getPassword().isBlank()) {
      mqttIo =
          MqttIO.read()
              .withConnectionConfiguration(
                  MqttIO.ConnectionConfiguration.create(
                          options.getBrokerServer(), options.getInputTopic())
                      .withUsername(options.getUsername())
                      .withPassword(options.getPassword()));
    } else {
      mqttIo =
          MqttIO.read()
              .withConnectionConfiguration(
                  MqttIO.ConnectionConfiguration.create(
                      options.getBrokerServer(), options.getInputTopic()));
    }

    return pipeline
        .apply("ReadFromMqttTopic", mqttIo)
        .apply(ParDo.of(new ByteToStringTransform()))
        .apply("WriteToPubSubTopic", PubsubIO.writeStrings().to(options.getOutputTopic()))
        .getPipeline()
        .run();
  }

  static class ByteToStringTransform extends DoFn<byte[], String> {
    @ProcessElement
    public void processElement(@Element byte[] word, OutputReceiver<String> out) {
      out.output(new String(word, StandardCharsets.UTF_8));
    }
  }

  /**
   * The {@link MqttToPubsubOptions} interface provides the custom execution options passed by the
   * executor at the command-line.
   */
  public interface MqttToPubsubOptions extends PipelineOptions {
    @TemplateParameter.Text(
        order = 1,
        optional = true,
        regexes = {"[,\\/:a-zA-Z0-9._-]+"},
        description = "MQTT Broker IP",
        helpText = "Server IP for MQTT broker",
        example = "tcp://host:1883")
    @Validation.Required
    String getBrokerServer();

    void setBrokerServer(String brokerServer);

    @TemplateParameter.Text(
        order = 2,
        optional = false,
        regexes = {"[\\/a-zA-Z0-9._-]+"},
        description = "MQTT topic(s) to read the input from",
        helpText = "MQTT topic(s) to read the input from.",
        example = "topic")
    @Validation.Required
    String getInputTopic();

    void setInputTopic(String inputTopics);

    @TemplateParameter.PubsubTopic(
        order = 3,
        description = "Output Pub/Sub topic",
        helpText =
            "The name of the topic to which data should published, in the format of 'projects/your-project-id/topics/your-topic-name'",
        example = "projects/your-project-id/topics/your-topic-name")
    @Validation.Required
    String getOutputTopic();

    void setOutputTopic(String outputTopic);

    @TemplateParameter.Text(
        order = 4,
        description = "MQTT Username",
        helpText = "MQTT username for authentication with MQTT server",
        example = "sampleusername")
    String getUsername();

    void setUsername(String username);

    @TemplateParameter.Password(
        order = 5,
        description = "MQTT Password",
        helpText = "Password for username provided for authentication with MQTT server",
        example = "samplepassword")
    String getPassword();

    void setPassword(String password);
  }
}

Langkah selanjutnya

Pelajari Template Dataflow.
Lihat daftar template yang disediakan Google.