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    Update `DeadLetterPolicy` on subscription

    Updates the `DeadLetterPolicy` on a subscription.

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

    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_admin 
  
 = 
  
 :: 
 google 
 :: 
 cloud 
 :: 
 pubsub_admin 
 ; 
 namespace 
  
 pubsub 
  
 = 
  
 :: 
 google 
 :: 
 cloud 
 :: 
 pubsub 
 ; 
 []( 
 pubsub_admin 
 :: 
 SubscriptionAdminClient 
  
 client 
 , 
  
 std 
 :: 
 string 
  
 const 
&  
 project_id 
 , 
  
 std 
 :: 
 string 
  
 const 
&  
 subscription_id 
 , 
  
 std 
 :: 
 string 
  
 const 
&  
 dead_letter_topic_id 
 , 
  
 int 
  
 dead_letter_delivery_attempts 
 ) 
  
 { 
  
 google 
 :: 
 pubsub 
 :: 
 v1 
 :: 
 UpdateSubscriptionRequest 
  
 request 
 ; 
  
 request 
 . 
 mutable_subscription 
 () 
 - 
> set_name 
 ( 
  
 pubsub 
 :: 
 Subscription 
 ( 
 project_id 
 , 
  
 subscription_id 
 ). 
 FullName 
 ()); 
  
 request 
 . 
 mutable_subscription 
 () 
  
 - 
> mutable_dead_letter_policy 
 () 
  
 - 
> set_dead_letter_topic 
 ( 
  
 pubsub 
 :: 
 Topic 
 ( 
 project_id 
 , 
  
 dead_letter_topic_id 
 ). 
 FullName 
 ()); 
  
 request 
 . 
 mutable_subscription 
 () 
  
 - 
> mutable_dead_letter_policy 
 () 
  
 - 
> set_max_delivery_attempts 
 ( 
 dead_letter_delivery_attempts 
 ); 
  
 * 
 request 
 . 
 mutable_update_mask 
 () 
 - 
> add_paths 
 () 
  
 = 
  
 "dead_letter_policy" 
 ; 
  
 auto 
  
 sub 
  
 = 
  
 client 
 . 
 UpdateSubscription 
 ( 
 request 
 ); 
  
 if 
  
 ( 
 ! 
 sub 
 ) 
  
 throw 
  
 std 
 :: 
 move 
 ( 
 sub 
 ). 
 status 
 (); 
  
 std 
 :: 
 cout 
 << 
 "The subscription has been updated to: " 
 << 
 sub 
 - 
> DebugString 
 () 
 << 
 " 
 \n 
 " 
 ; 
  
 std 
 :: 
 cout 
 << 
 "It will forward dead letter messages to: " 
 << 
 sub 
 - 
> dead_letter_policy 
 (). 
 dead_letter_topic 
 () 
 << 
 " 
 \n 
 " 
 ; 
  
 std 
 :: 
 cout 
 << 
 "After " 
 << 
 sub 
 - 
> dead_letter_policy 
 (). 
 max_delivery_attempts 
 () 
 << 
 " delivery attempts. 
 \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 
 
 ; 
 using 
  
  Google.Protobuf.WellKnownTypes 
 
 ; 
 public 
  
 class 
  
 UpdateDeadLetterPolicySample 
 { 
  
 public 
  
 Subscription 
  
 UpdateDeadLetterPolicy 
 ( 
 string 
  
 projectId 
 , 
  
 string 
  
 topicId 
 , 
  
 string 
  
 subscriptionId 
 , 
  
 string 
  
 deadLetterTopicId 
 ) 
  
 { 
  
  SubscriberServiceApiClient 
 
  
 subscriber 
  
 = 
  
  SubscriberServiceApiClient 
 
 . 
  Create 
 
 (); 
  
 // This is an existing topic that the subscription with dead letter policy is attached to. 
  
  TopicName 
 
  
 topicName 
  
 = 
  
  TopicName 
 
 . 
  FromProjectTopic 
 
 ( 
 projectId 
 , 
  
 topicId 
 ); 
  
 // This is an existing subscription with a dead letter policy. 
  
  SubscriptionName 
 
  
 subscriptionName 
  
 = 
  
  SubscriptionName 
 
 . 
  FromProjectSubscription 
 
 ( 
 projectId 
 , 
  
 subscriptionId 
 ); 
  
 // This is an existing dead letter topic that the subscription with dead letter policy forwards 
  
 // dead letter messages to. 
  
 var 
  
 deadLetterTopic 
  
 = 
  
  TopicName 
 
 . 
  FromProjectTopic 
 
 ( 
 projectId 
 , 
  
 deadLetterTopicId 
 ). 
 ToString 
 (); 
  
 // Construct the subscription with the dead letter policy you expect to have after the update. 
  
 // Here, values in the required fields (name, topic) help identify the subscription. 
  
 var 
  
 subscription 
  
 = 
  
 new 
  
  Subscription 
 
  
 { 
  
 SubscriptionName 
  
 = 
  
 subscriptionName 
 , 
  
 TopicAsTopicName 
  
 = 
  
 topicName 
 , 
  
 DeadLetterPolicy 
  
 = 
  
 new 
  
  DeadLetterPolicy 
 
  
 { 
  
 DeadLetterTopic 
  
 = 
  
 deadLetterTopic 
 , 
  
 MaxDeliveryAttempts 
  
 = 
  
 20 
 , 
  
 } 
  
 }; 
  
 var 
  
 request 
  
 = 
  
 new 
  
  UpdateSubscriptionRequest 
 
  
 { 
  
 Subscription 
  
 = 
  
 subscription 
 , 
  
 // Construct a field mask to indicate which field to update in the subscription. 
  
 UpdateMask 
  
 = 
  
 new 
  
  FieldMask 
 
  
 { 
  
 Paths 
  
 = 
  
 { 
  
 "dead_letter_policy" 
  
 } 
  
 } 
  
 }; 
  
 var 
  
 updatedSubscription 
  
 = 
  
 subscriber 
 . 
  UpdateSubscription 
 
 ( 
 request 
 ); 
  
 return 
  
 updatedSubscription 
 ; 
  
 } 
 }

    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/v2" 
  
 "cloud.google.com/go/pubsub/v2/apiv1/pubsubpb" 
  
 "google.golang.org/protobuf/types/known/fieldmaskpb" 
 ) 
 // updateDeadLetter updates an existing subscription with a dead letter policy. 
 func 
  
 updateDeadLetter 
 ( 
 w 
  
 io 
 . 
 Writer 
 , 
  
 projectID 
 , 
  
 subscription 
 , 
  
 deadLetterTopic 
  
 string 
 ) 
  
 error 
  
 { 
  
 // projectID := "my-project-id" 
  
 // subID := "projects/my-project-id/subscriptions/my-sub" 
  
 // deadLetterTopic := "projects/my-project-id/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 
 () 
  
 sub 
 , 
  
 err 
  
 := 
  
 client 
 . 
 SubscriptionAdminClient 
 . 
 UpdateSubscription 
 ( 
 ctx 
 , 
  
& pubsubpb 
 . 
 UpdateSubscriptionRequest 
 { 
  
 Subscription 
 : 
  
& pubsubpb 
 . 
 Subscription 
 { 
  
 Name 
 : 
  
 subscription 
 , 
  
 DeadLetterPolicy 
 : 
  
& pubsubpb 
 . 
 DeadLetterPolicy 
 { 
  
 MaxDeliveryAttempts 
 : 
  
 20 
 , 
  
 DeadLetterTopic 
 : 
  
 deadLetterTopic 
 , 
  
 }, 
  
 }, 
  
 UpdateMask 
 : 
  
& fieldmaskpb 
 . 
 FieldMask 
 { 
  
 Paths 
 : 
  
 [] 
 string 
 { 
 "dead_letter_policy" 
 }, 
  
 }, 
  
 }) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "UpdateSubscription: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "Updated 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.protobuf. FieldMask 
 
 ; 
 import 
  
 com.google.pubsub.v1. DeadLetterPolicy 
 
 ; 
 import 
  
 com.google.pubsub.v1. Subscription 
 
 ; 
 import 
  
 com.google.pubsub.v1. SubscriptionName 
 
 ; 
 import 
  
 com.google.pubsub.v1. TopicName 
 
 ; 
 import 
  
 com.google.pubsub.v1. UpdateSubscriptionRequest 
 
 ; 
 import 
  
 java.io.IOException 
 ; 
 public 
  
 class 
 UpdateDeadLetterPolicyExample 
  
 { 
  
 public 
  
 static 
  
 void 
  
 main 
 ( 
 String 
 ... 
  
 args 
 ) 
  
 throws 
  
 Exception 
  
 { 
  
 // TODO(developer): Replace these variables before running the sample. 
  
 String 
  
 projectId 
  
 = 
  
 "your-project-id" 
 ; 
  
 // This is an existing subscription with a dead letter policy. 
  
 String 
  
 subscriptionId 
  
 = 
  
 "your-subscription-id" 
 ; 
  
 // This is an existing topic that the subscription with dead letter policy is attached to. 
  
 String 
  
 topicId 
  
 = 
  
 "your-topic-id" 
 ; 
  
 // This is an existing dead letter topic that the subscription with dead letter policy forwards 
  
 // dead letter messages to. 
  
 String 
  
 deadLetterTopicId 
  
 = 
  
 "your-dead-letter-topic-id" 
 ; 
  
 UpdateDeadLetterPolicyExample 
 . 
 updateDeadLetterPolicyExample 
 ( 
  
 projectId 
 , 
  
 subscriptionId 
 , 
  
 topicId 
 , 
  
 deadLetterTopicId 
 ); 
  
 } 
  
 public 
  
 static 
  
 void 
  
 updateDeadLetterPolicyExample 
 ( 
  
 String 
  
 projectId 
 , 
  
 String 
  
 subscriptionId 
 , 
  
 String 
  
 topicId 
 , 
  
 String 
  
 deadLetterTopicId 
 ) 
  
 throws 
  
 IOException 
  
 { 
  
 try 
  
 ( 
  SubscriptionAdminClient 
 
  
 subscriptionAdminClient 
  
 = 
  
  SubscriptionAdminClient 
 
 . 
 create 
 ()) 
  
 { 
  
  SubscriptionName 
 
  
 subscriptionName 
  
 = 
  
  SubscriptionName 
 
 . 
 of 
 ( 
 projectId 
 , 
  
 subscriptionId 
 ); 
  
 System 
 . 
 out 
 . 
 println 
 ( 
  
 "Before: " 
  
 + 
  
 subscriptionAdminClient 
 . 
 getSubscription 
 ( 
 subscriptionName 
 ). 
 getAllFields 
 ()); 
  
  TopicName 
 
  
 topicName 
  
 = 
  
  TopicName 
 
 . 
 of 
 ( 
 projectId 
 , 
  
 topicId 
 ); 
  
  TopicName 
 
  
 deadLetterTopicName 
  
 = 
  
  TopicName 
 
 . 
 of 
 ( 
 projectId 
 , 
  
 deadLetterTopicId 
 ); 
  
 // Construct the dead letter policy you expect to have after the update. 
  
  DeadLetterPolicy 
 
  
 deadLetterPolicy 
  
 = 
  
  DeadLetterPolicy 
 
 . 
 newBuilder 
 () 
  
 . 
  setDeadLetterTopic 
 
 ( 
 deadLetterTopicName 
 . 
  toString 
 
 ()) 
  
 . 
  setMaxDeliveryAttempts 
 
 ( 
 20 
 ) 
  
 . 
 build 
 (); 
  
 // Construct the subscription with the dead letter policy you expect to have 
  
 // after the update. Here, values in the required fields (name, topic) help 
  
 // identify the subscription. 
  
  Subscription 
 
  
 subscription 
  
 = 
  
  Subscription 
 
 . 
 newBuilder 
 () 
  
 . 
 setName 
 ( 
 subscriptionName 
 . 
  toString 
 
 ()) 
  
 . 
 setTopic 
 ( 
 topicName 
 . 
  toString 
 
 ()) 
  
 . 
  setDeadLetterPolicy 
 
 ( 
 deadLetterPolicy 
 ) 
  
 . 
 build 
 (); 
  
 // Construct a field mask to indicate which field to update in the subscription. 
  
  FieldMask 
 
  
 updateMask 
  
 = 
  
  FieldMask 
 
 . 
 newBuilder 
 (). 
  addPaths 
 
 ( 
 "dead_letter_policy.max_delivery_attempts" 
 ). 
 build 
 (); 
  
  UpdateSubscriptionRequest 
 
  
 request 
  
 = 
  
  UpdateSubscriptionRequest 
 
 . 
 newBuilder 
 () 
  
 . 
 setSubscription 
 ( 
 subscription 
 ) 
  
 . 
 setUpdateMask 
 ( 
 updateMask 
 ) 
  
 . 
 build 
 (); 
  
  Subscription 
 
  
 response 
  
 = 
  
 subscriptionAdminClient 
 . 
 updateSubscription 
 ( 
 request 
 ); 
  
 System 
 . 
 out 
 . 
 println 
 ( 
 "After: " 
  
 + 
  
 response 
 . 
 getAllFields 
 ()); 
  
 System 
 . 
 out 
 . 
 println 
 ( 
  
 "Max delivery attempts is now " 
  
 + 
  
 response 
 . 
  getDeadLetterPolicy 
 
 (). 
 getMaxDeliveryAttempts 
 ()); 
  
 } 
  
 } 
 }

    Node.js

    Before trying this sample, follow the Node.js setup instructions in the Pub/Sub quickstart using client libraries . For more information, see the Pub/Sub Node.js 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 .

      /** 
  
 * 
  
 TODO 
 ( 
 developer 
 ): 
  
 Uncomment 
  
 these 
  
 variables 
  
 before 
  
 running 
  
 the 
  
 sample 
 . 
  
 */ 
 // 
  
 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 
  
 updateDeadLetterPolicy 
 ( 
 topicNameOrId 
 , 
  
 subscriptionNameOrId 
 ) 
  
 { 
  
 const 
  
 metadata 
  
 = 
  
 { 
  
 deadLetterPolicy 
 : 
  
 { 
  
 deadLetterTopic 
 : 
  
 pubSubClient 
 . 
 topic 
 ( 
 topicNameOrId 
 ) 
 . 
 name 
 , 
  
 maxDeliveryAttempts 
 : 
  
 15 
 , 
  
 }, 
  
 }; 
  
 await 
  
 pubSubClient 
  
 . 
 topic 
 ( 
 topicNameOrId 
 ) 
  
 . 
 subscription 
 ( 
 subscriptionNameOrId 
 ) 
  
 . 
 setMetadata 
 ( 
 metadata 
 ); 
  
 console 
 . 
 log 
 ( 
 'Max delivery attempts updated successfully.' 
 ); 
 }

    Node.js

    Before trying this sample, follow the Node.js setup instructions in the Pub/Sub quickstart using client libraries . For more information, see the Pub/Sub Node.js 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 .

      /** 
 * 
 TODO 
 ( 
 developer 
 ): 
 Uncomment 
 these 
 variables 
 before 
 running 
 the 
 sample 
 . 
 */ 
 // 
 const 
 topicNameOrId 
 = 
 'YOUR_TOPIC_NAME_OR_ID' 
 ; 
 // 
 const 
 subscriptionNameOrId 
 = 
 'YOUR_SUBSCRIPTION_NAME_OR_ID' 
 ; 
 // 
 Imports 
 the 
 Google 
 Cloud 
 client 
 library 
 import 
  
 { 
 PubSub 
 , 
 SubscriptionMetadata 
 } 
 from 
  
 '@google-cloud/pubsub' 
 ; 
 // 
 Creates 
 a 
 client 
 ; 
 cache 
 this 
 for 
 further 
 use 
 const 
 pubSubClient 
 = 
 new 
 PubSub 
 (); 
 async 
 function 
 updateDeadLetterPolicy 
 ( 
 topicNameOrId 
 : 
 string 
 , 
 subscriptionNameOrId 
 : 
 string 
 , 
 ) 
 { 
 const 
 metadata 
 : 
 SubscriptionMetadata 
 = 
 { 
 deadLetterPolicy 
 : 
 { 
 deadLetterTopic 
 : 
 pubSubClient 
 . 
 topic 
 ( 
 topicNameOrId 
 ) 
 . 
 name 
 , 
 maxDeliveryAttempts 
 : 
 15 
 , 
 }, 
 }; 
 await 
 pubSubClient 
 . 
 topic 
 ( 
 topicNameOrId 
 ) 
 . 
 subscription 
 ( 
 subscriptionNameOrId 
 ) 
 . 
 setMetadata 
 ( 
 metadata 
 ); 
 console 
 . 
 log 
 ( 
 'Max delivery attempts updated successfully.' 
 ); 
 }

    PHP

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

      use Google\Cloud\PubSub\PubSubClient; 
 /** 
 * Set the dead letter policy on an existing subscription. 
 * 
 * @param string $projectId  The Google project ID. 
 * @param string $topicName  The Pub/Sub topic name. 
 * @param string $deadLetterTopicName The Pub/Sub topic to use for dead letter policy. 
 */ 
 function dead_letter_update_subscription( 
 string $projectId, 
 string $topicName, 
 string $subscriptionName, 
 string $deadLetterTopicName 
 ): void { 
 $pubsub = new PubSubClient([ 
 'projectId' => $projectId, 
 ]); 
 $topic = $pubsub->topic($topicName); 
 $deadLetterTopic = $pubsub->topic($deadLetterTopicName); 
 $subscription = $topic->subscription($subscriptionName); 
 $subscription->update([ 
 'deadLetterPolicy' => [ 
 'deadLetterTopic' => $deadLetterTopic 
 ] 
 ]); 
 printf( 
 'Subscription %s updated with dead letter topic %s' . PHP_EOL, 
 $subscription->name(), 
 $deadLetterTopic->name() 
 ); 
 }

    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 
 from 
  
 google.cloud.pubsub_v1.types 
  
 import 
  DeadLetterPolicy 
 
 , 
  FieldMask 
 
 # TODO(developer) 
 # project_id = "your-project-id" 
 # TODO(developer): This is an existing topic that the subscription 
 # with dead letter policy is attached to. 
 # topic_id = "your-topic-id" 
 # TODO(developer): This is an existing subscription with a dead letter policy. 
 # subscription_id = "your-subscription-id" 
 # TODO(developer): This is an existing dead letter topic that the subscription 
 # with dead letter policy will forward dead letter messages to. 
 # dead_letter_topic_id = "your-dead-letter-topic-id" 
 # TODO(developer): This is the maximum number of delivery attempts allowed 
 # for a message before it gets delivered to a dead letter topic. 
 # max_delivery_attempts = 5 
 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 
 ) 
 dead_letter_topic_path 
 = 
 publisher 
 . 
 topic_path 
 ( 
 project_id 
 , 
 dead_letter_topic_id 
 ) 
 subscription_before_update 
 = 
 subscriber 
 . 
 get_subscription 
 ( 
 request 
 = 
 { 
 "subscription" 
 : 
 subscription_path 
 } 
 ) 
 print 
 ( 
 f 
 "Before the update: 
 { 
 subscription_before_update 
 } 
 ." 
 ) 
 # Indicates which fields in the provided subscription to update. 
 update_mask 
 = 
 FieldMask 
 ( 
 paths 
 = 
 [ 
 "dead_letter_policy" 
 ]) 
 # Construct a dead letter policy you expect to have after the update. 
 dead_letter_policy 
 = 
 DeadLetterPolicy 
 ( 
 dead_letter_topic 
 = 
 dead_letter_topic_path 
 , 
 max_delivery_attempts 
 = 
 max_delivery_attempts 
 , 
 ) 
 # Construct the subscription with the dead letter policy you expect to have 
 # after the update. Here, values in the required fields (name, topic) help 
 # identify the subscription. 
 subscription 
 = 
 pubsub_v1 
 . 
 types 
 . 
  Subscription 
 
 ( 
 name 
 = 
 subscription_path 
 , 
 topic 
 = 
 topic_path 
 , 
 dead_letter_policy 
 = 
 dead_letter_policy 
 , 
 ) 
 with 
 subscriber 
 : 
 subscription_after_update 
 : 
 gapic_types 
 . 
  Subscription 
 
 = 
 ( 
 subscriber 
 . 
 update_subscription 
 ( 
 request 
 = 
 { 
 "subscription" 
 : 
 subscription 
 , 
 "update_mask" 
 : 
 update_mask 
 } 
 ) 
 ) 
 print 
 ( 
 f 
 "After the update: 
 { 
 subscription_after_update 
 } 
 ." 
 )

    Ruby

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

      # subscription_id       = "your-subscription-id" 
 # role                  = "roles/pubsub.publisher" 
 # service_account_email = 
 # "serviceAccount:account_name@project_name.iam.gserviceaccount.com" 
 pubsub 
  
 = 
  
 Google 
 :: 
 Cloud 
 :: 
  PubSub 
 
 . 
  new 
 
 subscription_admin 
  
 = 
  
 pubsub 
 . 
  subscription_admin 
 
 subscription 
  
 = 
  
 subscription_admin 
 . 
 get_subscription 
  
 \ 
  
 subscription 
 : 
  
 pubsub 
 . 
 subscription_path 
 ( 
 subscription_id 
 ) 
 subscription 
 . 
  dead_letter_policy 
 
 . 
  max_delivery_attempts 
 
  
 = 
  
 20 
 subscription_admin 
 . 
 update_subscription 
  
 subscription 
 : 
  
 subscription 
 , 
  
 update_mask 
 : 
  
 { 
  
 paths 
 : 
  
 [ 
 "dead_letter_policy" 
 ] 
  
 } 
 puts 
  
 "Max delivery attempts is now " 
  
 \ 
  
 " 
 #{ 
 subscription 
 . 
  dead_letter_policy 
 
 . 
  max_delivery_attempts 
 
 } 
 ."

    What's next

    To search and filter code samples for other Google Cloud products, see the Google Cloud sample browser .
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