risingwave_connector/source/nats/
split.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 risingwave_common::types::JsonbVal;
16use serde::{Deserialize, Serialize};
17
18use crate::error::ConnectorResult;
19use crate::source::{SplitId, SplitMetaData};
20
21#[derive(Debug, Clone, Eq, PartialEq, Serialize, Deserialize, Hash)]
22pub enum NatsOffset {
23    Earliest,
24    Latest,
25    SequenceNumber(String),
26    Timestamp(i64),
27    None,
28}
29
30/// The states of a NATS split, which will be persisted to checkpoint.
31#[derive(Clone, Serialize, Deserialize, Debug, PartialEq, Hash)]
32pub struct NatsSplit {
33    pub(crate) subject: String,
34    // TODO: to simplify the logic, return 1 split for first version. May use parallelism in
35    // future.
36    pub(crate) split_id: SplitId,
37    pub(crate) start_sequence: NatsOffset,
38}
39
40impl SplitMetaData for NatsSplit {
41    fn id(&self) -> SplitId {
42        // TODO: should avoid constructing a string every time
43        format!("{}", self.split_id).into()
44    }
45
46    fn restore_from_json(value: JsonbVal) -> ConnectorResult<Self> {
47        serde_json::from_value(value.take()).map_err(Into::into)
48    }
49
50    fn encode_to_json(&self) -> JsonbVal {
51        serde_json::to_value(self.clone()).unwrap().into()
52    }
53
54    fn update_offset(&mut self, _last_seen_offset: String) -> ConnectorResult<()> {
55        // we do not require to update the offset for nats, let durable consumer handle it
56        Ok(())
57    }
58}
59
60impl NatsSplit {
61    pub fn new(subject: String, split_id: SplitId, start_sequence: NatsOffset) -> Self {
62        Self {
63            subject,
64            split_id,
65            start_sequence,
66        }
67    }
68}
risingwave_connector/source/nats/split.rs

risingwave_connector/source/nats/
split.rs
