risingwave_frontend/handler/
drop_subscription.rs

1// Copyright 2025 RisingWave Labs
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15use pgwire::pg_response::{PgResponse, StatementType};
16use risingwave_sqlparser::ast::ObjectName;
17
18use super::util::execute_with_long_running_notification;
19use super::{HandlerArgs, RwPgResponse};
20use crate::Binder;
21use crate::catalog::root_catalog::SchemaPath;
22use crate::error::Result;
23
24pub async fn handle_drop_subscription(
25    handler_args: HandlerArgs,
26    subscription_name: ObjectName,
27    if_exists: bool,
28    cascade: bool,
29) -> Result<RwPgResponse> {
30    let session = handler_args.session;
31    let db_name = &session.database();
32    let (schema_name, subscription_name) =
33        Binder::resolve_schema_qualified_name(db_name, &subscription_name)?;
34    let search_path = session.config().search_path();
35    let user_name = &session.user_name();
36    let schema_path = SchemaPath::new(schema_name.as_deref(), &search_path, user_name);
37
38    let subscription = {
39        let catalog_reader = session.env().catalog_reader().read_guard();
40        let (subscription, schema_name) =
41            match catalog_reader.get_subscription_by_name(db_name, schema_path, &subscription_name)
42            {
43                Ok((subscription, schema)) => (subscription.clone(), schema),
44                Err(e) => {
45                    return if if_exists {
46                        Ok(RwPgResponse::builder(StatementType::DROP_SUBSCRIPTION)
47                            .notice(format!(
48                                "subscription \"{}\" does not exist, skipping",
49                                subscription_name
50                            ))
51                            .into())
52                    } else {
53                        Err(e.into())
54                    };
55                }
56            };
57
58        session.check_privilege_for_drop_alter(schema_name, &*subscription)?;
59
60        subscription
61    };
62
63    let subscription_id = subscription.id;
64
65    let catalog_writer = session.catalog_writer()?;
66    execute_with_long_running_notification(
67        catalog_writer.drop_subscription(subscription_id, cascade),
68        &session,
69        "DROP SUBSCRIPTION",
70    )
71    .await?;
72
73    Ok(PgResponse::empty_result(StatementType::DROP_SUBSCRIPTION))
74}
risingwave_frontend/handler/drop_subscription.rs

risingwave_frontend/handler/
drop_subscription.rs
