pingap_config/
storage.rs

1// Copyright 2024-2025 Tree xie.
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 crate::{Error, Observer};
16use async_trait::async_trait;
17
18type Result<T, E = Error> = std::result::Result<T, E>;
19
20#[derive(Debug, Clone)]
21pub struct History {
22    pub data: String,
23    pub created_at: u64,
24}
25
26#[async_trait]
27pub trait Storage: Send + Sync {
28    /// fetch from storage
29    async fn fetch(&self, key: &str) -> Result<String>;
30
31    /// save to storage
32    async fn save(&self, key: &str, value: &str) -> Result<()>;
33
34    /// delete from storage
35    async fn delete(&self, key: &str) -> Result<()>;
36    fn support_observer(&self) -> bool {
37        false
38    }
39    fn support_history(&self) -> bool {
40        false
41    }
42    async fn fetch_history(&self, _key: &str) -> Result<Option<Vec<History>>> {
43        Ok(None)
44    }
45    /// Sets up a watch on the config path to observe changes
46    /// Note: May miss changes if processing takes too long between updates
47    /// Should be used with periodic full fetches to ensure consistency
48    async fn observe(&self) -> Result<Observer> {
49        Ok(Observer {
50            etcd_watch_stream: None,
51        })
52    }
53}
pingap_config/storage.rs

pingap_config/
storage.rs
