Create a push subscription with payload unwrapping enabled.

Create a push subscription with payload unwrapping enabled.

Explore further

For detailed documentation that includes this code sample, see the following:

• Payload unwrapping for Pub/Sub push subscriptions

Code sample

C++

Before trying this sample, follow the C++ setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub C++ API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

namespace pubsub = ::google::cloud::pubsub;
namespace pubsub_admin = ::google::cloud::pubsub_admin;
[](pubsub_admin::SubscriptionAdminClient client,
   std::string const& project_id, std::string const& topic_id,
   std::string const& subscription_id, std::string const& endpoint) {
  google::pubsub::v1::Subscription request;
  request.set_name(
      pubsub::Subscription(project_id, subscription_id).FullName());
  request.set_topic(pubsub::Topic(project_id, topic_id).FullName());
  request.mutable_push_config()->set_push_endpoint(endpoint);
  request.mutable_push_config()->mutable_no_wrapper()->set_write_metadata(
      true);
  auto sub = client.CreateSubscription(request);
  if (sub.status().code() == google::cloud::StatusCode::kAlreadyExists) {
    std::cout << "The subscription already exists\n";
    return;
  }
  if (!sub) throw std::move(sub).status();

  std::cout << "The subscription was successfully created: "
            << sub->DebugString() << "\n";
}

C#

Before trying this sample, follow the C# setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub C# API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

using Google.Cloud.PubSub.V1;

public class CreateUnwrappedPushSubscriptionSample
{
    public Subscription CreateUnwrappedPushSubscription(string projectId, string topicId, string subscriptionId, string pushEndpoint)
    {
        SubscriberServiceApiClient subscriber = SubscriberServiceApiClient.Create();
        TopicName topicName = TopicName.FromProjectTopic(projectId, topicId);
        SubscriptionName subscriptionName = SubscriptionName.FromProjectSubscription(projectId, subscriptionId);

        // NoWrapper is used to indicate that only the message data should be in the request body
        // sent to the push endpoint. Message metadata is optionally included in headers.
        var noWrapper = new PushConfig.Types.NoWrapper
        {
            // Determines if message metadata is added to the HTTP headers of
            // the delivered message.
            WriteMetadata = true
        };

        PushConfig pushConfig = new PushConfig { PushEndpoint = pushEndpoint, NoWrapper = noWrapper };

        // The approximate amount of time in seconds (on a best-effort basis) Pub/Sub waits for the
        // subscriber to acknowledge receipt before resending the message.
        var ackDeadlineSeconds = 60;
        var subscription = subscriber.CreateSubscription(subscriptionName, topicName, pushConfig, ackDeadlineSeconds);
        return subscription;
    }
}

Go

Before trying this sample, follow the Go setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Go API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import (
	"context"
	"fmt"
	"io"
	"time"

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

// createPushNoWrapperSubscription creates a push subscription where messages are delivered in the HTTP body.
func createPushNoWrapperSubscription(w io.Writer, projectID, subID string, topic *pubsub.Topic, endpoint string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	// topic of type https://godoc.org/cloud.google.com/go/pubsub#Topic
	// endpoint := "https://my-test-project.appspot.com/push"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	sub, err := client.CreateSubscription(ctx, subID, pubsub.SubscriptionConfig{
		Topic:       topic,
		AckDeadline: 10 * time.Second,
		PushConfig: pubsub.PushConfig{
			Endpoint: endpoint,
			Wrapper: &pubsub.NoWrapper{
				// Determines if message metadata is added to the HTTP headers of
				// the delivered message.
				WriteMetadata: true,
			},
		},
	})
	if err != nil {
		return fmt.Errorf("CreateSubscription: %w", err)
	}
	fmt.Fprintf(w, "Created push no wrapper subscription: %v\n", sub)
	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Java API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

import com.google.cloud.pubsub.v1.SubscriptionAdminClient;
import com.google.pubsub.v1.PushConfig;
import com.google.pubsub.v1.PushConfig.NoWrapper;
import com.google.pubsub.v1.Subscription;
import com.google.pubsub.v1.SubscriptionName;
import com.google.pubsub.v1.TopicName;
import java.io.IOException;

public class CreateUnwrappedPushSubscriptionExample {
  public static void main(String... args) throws Exception {
    // TODO(developer): Replace these variables before running the sample.
    String projectId = "your-project-id";
    String subscriptionId = "your-subscription-id";
    String topicId = "your-topic-id";
    String pushEndpoint = "https://my-test-project.appspot.com/push";

    createPushSubscriptionExample(projectId, subscriptionId, topicId, pushEndpoint);
  }

  public static void createPushSubscriptionExample(
      String projectId, String subscriptionId, String topicId, String pushEndpoint)
      throws IOException {
    try (SubscriptionAdminClient subscriptionAdminClient = SubscriptionAdminClient.create()) {
      TopicName topicName = TopicName.of(projectId, topicId);
      SubscriptionName subscriptionName = SubscriptionName.of(projectId, subscriptionId);
      NoWrapper noWrapper =
          NoWrapper.newBuilder()
              // Determines if message metadata is added to the HTTP headers of
              // the delivered message.
              .setWriteMetadata(true)
              .build();
      PushConfig pushConfig =
          PushConfig.newBuilder().setPushEndpoint(pushEndpoint).setNoWrapper(noWrapper).build();

      // Create a push subscription with default acknowledgement deadline of 10 seconds.
      // Messages not successfully acknowledged within 10 seconds will get resent by the server.
      Subscription subscription =
          subscriptionAdminClient.createSubscription(subscriptionName, topicName, pushConfig, 10);
      System.out.println("Created push subscription: " + subscription.getName());
    }
  }
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const pushEndpoint = 'YOUR_ENDPOINT_URL';
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

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

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createPushSubscriptionNoWrapper(
  pushEndpoint,
  topicNameOrId,
  subscriptionNameOrId
) {
  const options = {
    pushConfig: {
      // Set to an HTTPS endpoint of your choice. If necessary, register
      // (authorize) the domain on which the server is hosted.
      pushEndpoint,
      // When true, writes the Pub/Sub message metadata to
      // `x-goog-pubsub-<KEY>:<VAL>` headers of the HTTP request. Writes the
      // Pub/Sub message attributes to `<KEY>:<VAL>` headers of the HTTP request.
      noWrapper: {
        writeMetadata: true,
      },
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);
  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

Node.js

/**
 * TODO(developer): Uncomment these variables before running the sample.
 */
// const pushEndpoint = 'YOUR_ENDPOINT_URL';
// const topicNameOrId = 'YOUR_TOPIC_NAME_OR_ID';
// const subscriptionNameOrId = 'YOUR_SUBSCRIPTION_NAME_OR_ID';

// Imports the Google Cloud client library
import {PubSub, CreateSubscriptionOptions} from '@google-cloud/pubsub';

// Creates a client; cache this for further use
const pubSubClient = new PubSub();

async function createPushSubscriptionNoWrapper(
  pushEndpoint: string,
  topicNameOrId: string,
  subscriptionNameOrId: string
) {
  const options: CreateSubscriptionOptions = {
    pushConfig: {
      // Set to an HTTPS endpoint of your choice. If necessary, register
      // (authorize) the domain on which the server is hosted.
      pushEndpoint,
      // When true, writes the Pub/Sub message metadata to
      // `x-goog-pubsub-<KEY>:<VAL>` headers of the HTTP request. Writes the
      // Pub/Sub message attributes to `<KEY>:<VAL>` headers of the HTTP request.
      noWrapper: {
        writeMetadata: true,
      },
    },
  };

  await pubSubClient
    .topic(topicNameOrId)
    .createSubscription(subscriptionNameOrId, options);
  console.log(`Subscription ${subscriptionNameOrId} created.`);
}

Python

Before trying this sample, follow the Python setup instructions in the Pub/Sub quickstart using client libraries. For more information, see the Pub/Sub Python API reference documentation.

To authenticate to Pub/Sub, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

from google.cloud import pubsub_v1

# TODO(developer)
# project_id = "your-project-id"
# topic_id = "your-topic-id"
# subscription_id = "your-subscription-id"
# endpoint = "https://my-test-project.appspot.com/push"

publisher = pubsub_v1.PublisherClient()
subscriber = pubsub_v1.SubscriberClient()
topic_path = publisher.topic_path(project_id, topic_id)
subscription_path = subscriber.subscription_path(project_id, subscription_id)

no_wrapper = pubsub_v1.types.PushConfig.NoWrapper(write_metadata=True)
push_config = pubsub_v1.types.PushConfig(
    push_endpoint=endpoint, no_wrapper=no_wrapper
)

# Wrap the subscriber in a 'with' block to automatically call close() to
# close the underlying gRPC channel when done.
with subscriber:
    subscription = subscriber.create_subscription(
        request={
            "name": subscription_path,
            "topic": topic_path,
            "push_config": push_config,
        }
    )

print(f"Push no wrapper subscription created: {subscription}.")
print(f"Endpoint for subscription is: {endpoint}")
print(f"No wrapper configuration for subscription is: {no_wrapper}")

What's next

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