Cloud Pub/Sub Client Libraries

This page shows how to get started with the Cloud Client Libraries for the Cloud Pub/Sub API.

Note: Instructions on this page apply to the Python 3 and Java 8 App Engine standard environments. To use Python 2 with App Engine Standard, see this sample. To use Java 7, see the Google API Client Library for Java.

Read more about the client libraries for Cloud APIs in Client Libraries Explained.

Installing the client library

C#

For more information, see Setting Up a C# Development Environment.

The sample below uses latest version of Pub/Sub package (beta).

Install-Package Google.Cloud.PubSub.V1 -Pre

Go

go get -u cloud.google.com/go/pubsub

Java

For more information, see Setting Up a Java Development Environment. Si usas Maven, agrega lo siguiente a tu archivo pom.xml:

<dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>google-cloud-pubsub</artifactId>
  <version>1.61.0</version>
</dependency>

Si usas Gradle, agrega lo siguiente a tus dependencias:

compile 'com.google.cloud:google-cloud-pubsub:1.61.0'

Si usas SBT, agrega lo siguiente a tus dependencias:

libraryDependencies += "com.google.cloud" % "google-cloud-pubsub" % "1.61.0"

Si usas IntelliJ o Eclipse, puedes agregar bibliotecas cliente a tu proyecto mediante los siguientes complementos IDE:

• Cloud Tools for IntelliJ
• Cloud Tools for Eclipse

Los complementos brindan funcionalidades adicionales, como administración de claves para las cuentas de servicio. Consulta la documentación de cada complemento para obtener más detalles.

Nota: En este momento, las bibliotecas cliente de Cloud para Java no son compatibles con Android.

Node.js

For more information, see Setting Up a Node.js Development Environment.

Beta: This is a beta release of the Node.js Cloud Client Library for the Cloud Pub/Sub API. This library might be changed in backward-incompatible ways and is not subject to any SLA or deprecation policy.

npm install --save @google-cloud/pubsub

PHP

composer require google/cloud-pubsub

Python

For more information, see Setting Up a Python Development Environment.

Beta: This is a beta release of the Python Cloud Client Library for the Cloud Pub/Sub API . This library might be changed in backward-incompatible ways and is not subject to any SLA or deprecation policy.

pip install --upgrade google-cloud-pubsub

Ruby

For more information, see Setting Up a Ruby Development Environment.

gem install google-cloud-pubsub

Setting up authentication

To run the client library, you must first set up authentication by creating a service account and setting an environment variable. Complete the following steps to set up authentication. For more information, see the GCP authentication documentation .

GCP Console

1. En GCP Console, ve a la página Crear clave de la cuenta de servicio.

   Ir a la página Crear clave de la cuenta de servicio
2. Desde la lista desplegable de la Cuenta de servicio, selecciona Nueva cuenta de servicio.
3. En el campo Nombre de cuenta de servicio, ingresa un nombre.

4. En la lista desplegable Función, selecciona Proyecto > Propietario.

   Nota: El campo Función autoriza tu cuenta de servicio para acceder a los recursos. Puedes ver y cambiar este campo luego con GCP Console. Si desarrollas una aplicación de producción, especifica permisos más detallados que Proyecto > Propietario. Para obtener más información, consulta Cómo otorgar funciones a las cuentas de servicio.
5. Haz clic en Crear. Se descargará un archivo JSON a tu computadora que contiene tus descargas de claves.

Línea de comandos

Puedes ejecutar los siguientes comandos con el SDK de Cloud en tu máquina local o dentro de Cloud Shell.

1. Crea la cuenta de servicio. Reemplaza [NAME] con el nombre que le quieres poner a la cuenta de servicio.

   gcloud iam service-accounts create [NAME]

2. Otorga permisos a la cuenta de servicio. Reemplaza [PROJECT_ID] con el ID del proyecto.

   gcloud projects add-iam-policy-binding [PROJECT_ID] --member "serviceAccount:[NAME]@[PROJECT_ID].iam.gserviceaccount.com" --role "roles/owner"

   Nota: El campo Función autoriza a tu cuenta de servicio para acceder a los recursos. Puedes ver y cambiar este campo luego con GCP Console. Si desarrollas una aplicación de producción, especifica permisos más detallados que Proyecto > Propietario. Para obtener más información, consulta Cómo otorgar funciones a las cuentas de servicio.

3. Genera el archivo de claves. Reemplaza [FILE_NAME] con un nombre para el archivo de claves.

   gcloud iam service-accounts keys create [FILE_NAME].json --iam-account [NAME]@[PROJECT_ID].iam.gserviceaccount.com

Proporciónale las credenciales de autenticación a tu código de la aplicación mediante la configuración de la variable de entorno GOOGLE_APPLICATION_CREDENTIALS. Reemplaza [PATH] con la ruta de acceso al archivo JSON que contiene la clave de tu cuenta de servicio y [FILE_NAME] con el nombre del archivo. Esta variable solo se aplica a la sesión actual de shell. Por lo tanto, si abres una sesión nueva, deberás volver a configurar la variable.

Linux o macOS

export GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

Por ejemplo:

export GOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/[FILE_NAME].json"

Windows

Con PowerShell:

$env:GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

Por ejemplo:

$env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\[FILE_NAME].json"

Con el símbolo del sistema:

set GOOGLE_APPLICATION_CREDENTIALS=[PATH]

Using the client library

The following example shows how to use the client library.

C#

Before trying this sample, follow the C# setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub C# API reference documentation .

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using Google.Cloud.PubSub.V1;
using System;
using System.Diagnostics;

namespace GoogleCloudSamples
{
    public class QuickStart
    {
        public static int Main(string[] args)
        {
            // Instantiates a client
            PublisherServiceApiClient publisher = PublisherServiceApiClient.Create();

            // Your Google Cloud Platform project ID
            string projectId = "YOUR-PROJECT-ID";

            // The name for the new topic
            var topicName = new TopicName(projectId, "my-new-topic");

            // Creates the new topic
            try
            {
                Topic topic = publisher.CreateTopic(topicName);
                Console.WriteLine($"Topic {topic.Name} created.");
            }
            catch (Grpc.Core.RpcException e)
            when (e.Status.StatusCode == Grpc.Core.StatusCode.AlreadyExists)
            {
                Console.WriteLine($"Topic {topicName} already exists.");
            }
            return 0;
        }
    }
}

Go

Before trying this sample, follow the Go setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub Go API reference documentation .

If you're running on Google App Engine standard, we recommend using the older Google APIs Client Libraries. See this GitHub issue for more details.

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// Sample pubsub-quickstart creates a Google Cloud Pub/Sub topic.
package main

import (
	"context"
	"fmt"
	"log"

	"cloud.google.com/go/pubsub"
)

func main() {
	ctx := context.Background()

	// Sets your Google Cloud Platform project ID.
	projectID := "YOUR_PROJECT_ID"

	// Creates a client.
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		log.Fatalf("Failed to create client: %v", err)
	}

	// Sets the name for the new topic.
	topicName := "my-topic"

	// Creates the new topic.
	topic, err := client.CreateTopic(ctx, topicName)
	if err != nil {
		log.Fatalf("Failed to create topic: %v", err)
	}

	fmt.Printf("Topic %v created.\n", topic)
}

Java

Before trying this sample, follow the Java setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub Java API reference documentation .

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// Imports the Google Cloud client library

import com.google.api.gax.rpc.ApiException;
import com.google.cloud.ServiceOptions;
import com.google.cloud.pubsub.v1.TopicAdminClient;
import com.google.pubsub.v1.ProjectTopicName;

public class CreateTopicExample {

  /**
   * Create a topic.
   *
   * @param args topicId
   * @throws Exception exception thrown if operation is unsuccessful
   */
  public static void main(String... args) throws Exception {

    // Your Google Cloud Platform project ID
    String projectId = ServiceOptions.getDefaultProjectId();

    // Your topic ID, eg. "my-topic"
    String topicId = args[0];

    // Create a new topic
    ProjectTopicName topic = ProjectTopicName.of(projectId, topicId);
    try (TopicAdminClient topicAdminClient = TopicAdminClient.create()) {
      topicAdminClient.createTopic(topic);
      System.out.printf("Topic %s:%s created.\n", topic.getProject(), topic.getTopic());
    } catch (ApiException e) {
      // example : code = ALREADY_EXISTS(409) implies topic already exists
      System.out.print(e.getStatusCode().getCode());
      System.out.print(e.isRetryable());
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub Node.js API reference documentation .

View on GitHub Feedback

// Imports the Google Cloud client library
const {PubSub} = require('@google-cloud/pubsub');

async function quickstart(
  projectId = 'your-project-id', // Your Google Cloud Platform project ID
  topicName = 'my-topic' // Name for the new topic to create
) {
  // Instantiates a client
  const pubsub = new PubSub({projectId});

  // Creates the new topic
  const [topic] = await pubsub.createTopic(topicName);
  console.log(`Topic ${topic.name} created.`);
}

PHP

Before trying this sample, follow the PHP setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub PHP API reference documentation .

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# Includes the autoloader for libraries installed with composer
require __DIR__ . '/vendor/autoload.php';

# Imports the Google Cloud client library
use Google\Cloud\PubSub\PubSubClient;

# Your Google Cloud Platform project ID
$projectId = 'YOUR_PROJECT_ID';

# Instantiates a client
$pubsub = new PubSubClient([
    'projectId' => $projectId
]);

# The name for the new topic
$topicName = 'my-new-topic-2';

# Creates the new topic
$topic = $pubsub->createTopic($topicName);

echo 'Topic ' . $topic->name() . ' created.';

Python

Before trying this sample, follow the Python setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub Python API reference documentation .

View on GitHub Feedback

from google.cloud import pubsub_v1

# TODO project_id = "Your Google Cloud Project ID"
# TODO topic_name = "Your Pub/Sub topic name"

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(project_id, topic_name)

topic = publisher.create_topic(topic_path)

print('Topic created: {}'.format(topic))

Ruby

Before trying this sample, follow the Ruby setup instructions in the Cloud Pub/Sub Quickstart Using Client Libraries . For more information, see the Cloud Pub/Sub Ruby API reference documentation .

View on GitHub Feedback

# Imports the Google Cloud client library
require "google/cloud/pubsub"

# Your Google Cloud Platform project ID
project_id = "YOUR_PROJECT_ID"

# Instantiates a client
pubsub = Google::Cloud::Pubsub.new project: project_id

# The name for the new topic
topic_name = "my-new-topic"

# Creates the new topic
topic = pubsub.create_topic topic_name

puts "Topic #{topic.name} created."

Additional resources

C#

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

Go

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

Java

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

Node.js

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

PHP

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

Python

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow

Ruby

• API Reference Documentation
• Source Code
• GitHub Issue Tracker
• Stack Overflow