mithril_era/adapters/
file.rs

1use async_trait::async_trait;
2use std::{fs, path::PathBuf};
3
4use mithril_common::StdResult;
5
6use crate::{EraMarker, EraReaderAdapter};
7
8/// File adapter is intended to be used in a test environment
9/// to simulate eras transitions.
10pub struct FileAdapter {
11    markers_file: PathBuf,
12}
13
14impl FileAdapter {
15    /// File adapter factory
16    pub fn new(markers_file: PathBuf) -> Self {
17        Self { markers_file }
18    }
19}
20
21#[async_trait]
22impl EraReaderAdapter for FileAdapter {
23    async fn read(&self) -> StdResult<Vec<EraMarker>> {
24        Ok(serde_json::from_str(&fs::read_to_string(
25            &self.markers_file,
26        )?)?)
27    }
28}
29
30#[cfg(test)]
31mod tests {
32    use mithril_common::entities::{Epoch, SupportedEra};
33    use mithril_common::test_utils::TempDir;
34
35    use super::*;
36
37    fn get_temp_dir(dir_name: &str) -> PathBuf {
38        TempDir::create("era-adapter", dir_name)
39    }
40
41    #[tokio::test]
42    async fn file_adapter_output() {
43        let markers = vec![
44            EraMarker::new("one", Some(Epoch(1))),
45            EraMarker::new(&SupportedEra::dummy().to_string(), None),
46            EraMarker::new(&SupportedEra::dummy().to_string(), Some(Epoch(10))),
47        ];
48        let temp_file = get_temp_dir("era_reader_file_adapter").join("markers.json");
49        fs::write(
50            &temp_file,
51            serde_json::to_string(&markers).expect("serializing markers should not fail"),
52        )
53        .expect("writing markers to file should not fail");
54        let adapter = FileAdapter::new(temp_file);
55
56        assert_eq!(
57            markers,
58            adapter
59                .read()
60                .await
61                .expect("file adapter shall not fail reading")
62        );
63    }
64}
mithril_era/adapters/file.rs

mithril_era/adapters/
file.rs
