Get rid of redundant onUnknown response handler callback

neo4j/internal/bolt/bolt4.go

@@ -1014,9 +1014,6 @@ func (b *bolt4) discardResponseHandler(stream *stream) responseHandler {
 			stream.err = failure
 			b.onFailure(ctx, failure) // Will detach the stream
 		},
-		onUnknown: func(msg any) {
-			b.setError(fmt.Errorf("unknown response %v", msg), true)
-		},
 	}
 }
 
@@ -1056,9 +1053,6 @@ func (b *bolt4) pullResponseHandler(stream *stream) responseHandler {
 			stream.err = failure
 			b.onFailure(ctx, failure) // will detach the stream
 		},
-		onUnknown: func(msg any) {
-			b.setError(fmt.Errorf("unknown response %v", msg), true)
-		},
 	}
 
 }
@@ -1084,9 +1078,6 @@ func (b *bolt4) resetResponseHandler() responseHandler {
 			_ = b.onNeo4jError(ctx, b, failure)
 			b.state = bolt4_dead
 		},
-		onUnknown: func(any) {
-			b.state = bolt4_dead
-		},
 	}
 }
 
@@ -1123,7 +1114,6 @@ func (b *bolt4) expectedSuccessHandler(onSuccess func(*success)) responseHandler
 	return responseHandler{
 		onSuccess: onSuccess,
 		onFailure: b.onFailure,
-		onUnknown: b.onUnknown,
 		onIgnored: onIgnoredNoOp,
 	}
 }
@@ -1145,10 +1135,6 @@ func (b *bolt4) onFailure(ctx context.Context, failure *db.Neo4jError) {
 	b.setError(err, isFatalError(failure))
 }
 
-func (b *bolt4) onUnknown(msg any) {
-	b.setError(fmt.Errorf("expected success or database error, got %v", msg), true)
-}
-
 const readTimeoutHintName = "connection.recv_timeout_seconds"
 
 func (b *bolt4) initializeReadTimeoutHint(hints map[string]any) {

neo4j/internal/bolt/bolt5.go

@@ -1015,9 +1015,6 @@ func (b *bolt5) discardResponseHandler(stream *stream) responseHandler {
 			stream.err = failure
 			b.onFailure(ctx, failure) // Will detach the stream
 		},
-		onUnknown: func(msg any) {
-			b.setError(fmt.Errorf("unknown response %v", msg), true)
-		},
 	}
 }
 
@@ -1057,9 +1054,6 @@ func (b *bolt5) pullResponseHandler(stream *stream) responseHandler {
 			stream.err = failure
 			b.onFailure(ctx, failure) // Will detach the stream
 		},
-		onUnknown: func(msg any) {
-			b.setError(fmt.Errorf("unknown response %v", msg), true)
-		},
 	}
 }
 
@@ -1072,17 +1066,13 @@ func (b *bolt5) resetResponseHandler() responseHandler {
 			_ = b.onNeo4jError(ctx, b, failure)
 			b.state = bolt5Dead
 		},
-		onUnknown: func(any) {
-			b.state = bolt5Dead
-		},
 	}
 }
 
 func (b *bolt5) expectedSuccessHandler(onSuccess func(*success)) responseHandler {
 	return responseHandler{
 		onSuccess: onSuccess,
 		onFailure: b.onFailure,
-		onUnknown: b.onUnknown,
 		onIgnored: onIgnoredNoOp,
 	}
 }
@@ -1120,10 +1110,6 @@ func (b *bolt5) onFailure(ctx context.Context, failure *db.Neo4jError) {
 	b.setError(err, isFatalError(failure))
 }
 
-func (b *bolt5) onUnknown(msg any) {
-	b.setError(fmt.Errorf("expected success or database error, got %v", msg), true)
-}
-
 func (b *bolt5) initializeReadTimeoutHint(hints map[string]any) {
 	readTimeoutHint, ok := hints[readTimeoutHintName]
 	if !ok {

neo4j/internal/bolt/message_queue.go

@@ -182,11 +182,7 @@ func (q *messageQueue) receive(ctx context.Context) error {
 		}
 		onIgnored(message)
 	default:
-		onUnknown := handler.onUnknown
-		if onUnknown == nil {
-			return fmt.Errorf("protocol violation: the server sent an unknown %v response", message)
-		}
-		onUnknown(message)
+		panic(fmt.Errorf("did not expect message %v", res))
 	}
 	return nil
 }

neo4j/internal/bolt/message_queue_test.go

@@ -44,12 +44,12 @@ func TestMessageQueue(outer *testing.T) {
 			msgHello:    {onSuccess: func(*success) {}},
 			msgLogon:    {onFailure: func(context.Context, *db.Neo4jError) {}},
 			msgRoute:    {onIgnored: func(*ignored) {}},
-			msgBegin:    {onUnknown: func(any) {}},
+			msgBegin:    {onSuccess: func(*success) {}},
 			msgRun:      {onRecord: func(*db.Record) {}},
 			msgPullN:    {onSuccess: func(*success) {}},
 			msgCommit:   {onFailure: func(context.Context, *db.Neo4jError) {}},
 			msgRollback: {onIgnored: func(*ignored) {}},
-			msgDiscardN: {onUnknown: func(any) {}},
+			msgDiscardN: {onSuccess: func(*success) {}},
 			msgReset:    {onRecord: func(*db.Record) {}},
 			msgGoodbye:  {onSuccess: func(*success) {}},
 		}
@@ -311,9 +311,6 @@ func assertEqualResponseHandlers(t *testing.T, handler1, handler2 responseHandle
 	if !functionEqual(handler1.onFailure, handler2.onFailure) {
 		t.Errorf("expected onFailure callbacks to be equal")
 	}
-	if !functionEqual(handler1.onUnknown, handler2.onUnknown) {
-		t.Errorf("expected onUnknown callbacks to be equal")
-	}
 }
 
 func functionEqual(func1, func2 any) bool {

neo4j/internal/bolt/response_handler.go

@@ -9,7 +9,6 @@ type responseHandler struct {
 	onSuccess func(*success)
 	onRecord  func(*db.Record)
 	onFailure func(context.Context, *db.Neo4jError)
-	onUnknown func(any)
 	onIgnored func(*ignored)
 }