risingwave_frontend/expr/function_impl/
rw_cluster_id.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 std::fmt::Write;
16use std::sync::Arc;
17
18use risingwave_expr::{Result, capture_context, function};
19
20use super::context::META_CLIENT;
21use crate::meta_client::FrontendMetaClient;
22
23#[function("rw_cluster_id() -> varchar", volatile)]
24async fn rw_cluster_id(writer: &mut impl Write) -> Result<()> {
25    writer
26        .write_str(&rw_cluster_id_impl_captured().await?)
27        .unwrap();
28    Ok(())
29}
30
31#[capture_context(META_CLIENT)]
32async fn rw_cluster_id_impl(meta_client: &Arc<dyn FrontendMetaClient>) -> Result<String> {
33    Ok(meta_client.cluster_id().to_owned())
34}