(DEPRECATED) Update dead letter policy on subscription

Code sample

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"

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

// updateDeadLetter updates an existing subscription with a dead letter policy.
func updateDeadLetter(w io.Writer, projectID, subID string, fullyQualifiedDeadLetterTopic string) error {
	// projectID := "my-project-id"
	// subID := "my-sub"
	// fullyQualifiedDeadLetterTopic := "projects/my-project/topics/my-dead-letter-topic"
	ctx := context.Background()
	client, err := pubsub.NewClient(ctx, projectID)
	if err != nil {
		return fmt.Errorf("pubsub.NewClient: %w", err)
	}
	defer client.Close()

	updateConfig := pubsub.SubscriptionConfigToUpdate{
		DeadLetterPolicy: &pubsub.DeadLetterPolicy{
			DeadLetterTopic:     fullyQualifiedDeadLetterTopic,
			MaxDeliveryAttempts: 20,
		},
	}

	subConfig, err := client.Subscription(subID).Update(ctx, updateConfig)
	if err != nil {
		return fmt.Errorf("Update: %w", err)
	}
	fmt.Fprintf(w, "Updated subscription config: %+v\n", subConfig)
	return nil
}

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