v1 Update the topic schema (DEPRECATED)

  import 
  
 ( 
  
 "context" 
  
 "fmt" 
  
 "io" 
  
 "cloud.google.com/go/pubsub" 
 ) 
 func 
  
 updateTopicSchema 
 ( 
 w 
  
 io 
 . 
 Writer 
 , 
  
 projectID 
 , 
  
 topicID 
 , 
  
 firstRevisionID 
 , 
  
 lastRevisionID 
  
 string 
 ) 
  
 error 
  
 { 
  
 // projectID := "my-project-id" 
  
 // topicID := "my-topic" 
  
 // firstRevisionID := "my-revision-id" 
  
 // lastRevisionID := "my-revision-id" 
  
 ctx 
  
 := 
  
 context 
 . 
 Background 
 () 
  
 client 
 , 
  
 err 
  
 := 
  
 pubsub 
 . 
  NewClient 
 
 ( 
 ctx 
 , 
  
 projectID 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 return 
  
 fmt 
 . 
 Errorf 
 ( 
 "pubsub.NewClient: %w" 
 , 
  
 err 
 ) 
  
 } 
  
 t 
  
 := 
  
 client 
 . 
 Topic 
 ( 
 topicID 
 ) 
  
 // This updates the first / last revision ID for the topic's schema. 
  
 // To clear the schema entirely, use a zero valued (empty) SchemaSettings. 
  
 tc 
  
 := 
  
 pubsub 
 . 
 TopicConfigToUpdate 
 { 
  
 SchemaSettings 
 : 
  
& pubsub 
 . 
 SchemaSettings 
 { 
  
 FirstRevisionID 
 : 
  
 firstRevisionID 
 , 
  
 LastRevisionID 
 : 
  
 lastRevisionID 
 , 
  
 }, 
  
 } 
  
 gotTopicCfg 
 , 
  
 err 
  
 := 
  
 t 
 . 
 Update 
 ( 
 ctx 
 , 
  
 tc 
 ) 
  
 if 
  
 err 
  
 != 
  
 nil 
  
 { 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "topic.Update err: %v\n" 
 , 
  
 gotTopicCfg 
 ) 
  
 return 
  
 err 
  
 } 
  
 fmt 
 . 
 Fprintf 
 ( 
 w 
 , 
  
 "Updated topic with schema: %#v\n" 
 , 
  
 gotTopicCfg 
 ) 
  
 return 
  
 nil 
 }