Add DetachSubscription RPC

PiperOrigin-RevId: 313276022

google/pubsub/v1/pubsub.proto

@@ -88,7 +88,7 @@ service Publisher {
     option (google.api.method_signature) = "project";
   }
 
-  // Lists the names of the subscriptions on this topic.
+  // Lists the names of the attached subscriptions on this topic.
   rpc ListTopicSubscriptions(ListTopicSubscriptionsRequest)
       returns (ListTopicSubscriptionsResponse) {
     option (google.api.http) = {
@@ -122,6 +122,17 @@ service Publisher {
     };
     option (google.api.method_signature) = "topic";
   }
+
+  // Detaches a subscription from this topic. All messages retained in the
+  // subscription are dropped. Subsequent `Pull` and `StreamingPull` requests
+  // will return FAILED_PRECONDITION. If the subscription is a push
+  // subscription, pushes to the endpoint will stop.
+  rpc DetachSubscription(DetachSubscriptionRequest)
+      returns (DetachSubscriptionResponse) {
+    option (google.api.http) = {
+      post: "/v1/{subscription=projects/*/subscriptions/*}:detach"
+    };
+  }
 }
 
 message MessageStoragePolicy {
@@ -300,7 +311,7 @@ message ListTopicSubscriptionsRequest {
 
 // Response for the `ListTopicSubscriptions` method.
 message ListTopicSubscriptionsResponse {
-  // The names of the subscriptions that match the request.
+  // The names of subscriptions attached to the topic specified in the request.
   repeated string subscriptions = 1 [(google.api.resource_reference) = {
     type: "pubsub.googleapis.com/Subscription"
   }];
@@ -350,6 +361,20 @@ message DeleteTopicRequest {
   ];
 }
 
+// Request for the DetachSubscription method.
+message DetachSubscriptionRequest {
+  // Required. The subscription to detach.
+  // Format is `projects/{project}/subscriptions/{subscription}`.
+  string subscription = 1 [
+    (google.api.field_behavior) = REQUIRED,
+    (google.api.resource_reference) = { type: "pubsub.googleapis.com/Topic" }
+  ];
+}
+
+// Response for the DetachSubscription method.
+// Reserved for future use.
+message DetachSubscriptionResponse {}
+
 // The service that an application uses to manipulate subscriptions and to
 // consume messages from a subscription via the `Pull` method or by
 // establishing a bi-directional stream using the `StreamingPull` method.

google/pubsub/v1/pubsub_grpc_service_config.json

@@ -14,6 +14,10 @@
           "service": "google.pubsub.v1.Publisher",
           "method": "DeleteTopic"
         },
+        {
+          "service": "google.pubsub.v1.Publisher",
+          "method": "DetachSubscription"
+        },
         {
           "service": "google.pubsub.v1.Publisher",
           "method": "SetIamPolicy"