mithril_common/era/adapters/
file.rs

1use async_trait::async_trait;
2use std::{fs, path::PathBuf};
3
4use crate::era::{EraMarker, EraReaderAdapter};
5use crate::StdResult;
6
7/// File adapter is intended to be used in a test environment
8/// to simulate eras transitions.
9pub struct FileAdapter {
10    markers_file: PathBuf,
11}
12
13impl FileAdapter {
14    /// File adapter factory
15    pub fn new(markers_file: PathBuf) -> Self {
16        Self { markers_file }
17    }
18}
19
20#[async_trait]
21impl EraReaderAdapter for FileAdapter {
22    async fn read(&self) -> StdResult<Vec<EraMarker>> {
23        Ok(serde_json::from_str(&fs::read_to_string(
24            &self.markers_file,
25        )?)?)
26    }
27}
28
29#[cfg(test)]
30mod tests {
31    use crate::entities::Epoch;
32    use crate::era::SupportedEra;
33    use crate::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_common/era/adapters/file.rs

mithril_common/era/adapters/
file.rs
