reductstore 1.19.7

ReductStore is a time series database designed specifically for storing and managing large amounts of blob data.
Documentation 
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// Copyright 2021-2026 ReductSoftware UG
// Licensed under the Apache License, Version 2.0

use crate::backend::file::AccessMode;
use crate::backend::{ObjectMetadata, StorageBackend};
use async_trait::async_trait;
use std::path::{Path, PathBuf};

pub(super) struct NoopBackend;

#[async_trait]
impl StorageBackend for NoopBackend {
    fn path(&self) -> &PathBuf {
        panic!("NoopBackend does not have a path");
    }

    async fn rename(&self, _from: &Path, _to: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn remove(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn remove_dir_all(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn create_dir_all(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn read_dir(&self, _path: &Path) -> std::io::Result<Vec<PathBuf>> {
        Ok(vec![])
    }

    async fn try_exists(&self, _path: &Path) -> std::io::Result<bool> {
        Ok(false)
    }

    async fn upload(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn download(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }

    async fn update_local_cache(&self, _path: &Path, _mode: &AccessMode) -> std::io::Result<()> {
        Ok(())
    }

    async fn invalidate_locally_cached_files(&self) -> Vec<PathBuf> {
        vec![]
    }

    async fn get_stats(&self, _path: &Path) -> std::io::Result<Option<ObjectMetadata>> {
        Ok(None)
    }

    async fn remove_from_local_cache(&self, _path: &Path) -> std::io::Result<()> {
        Ok(())
    }
}

impl NoopBackend {
    pub fn new() -> Self {
        NoopBackend
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use rstest::*;

    #[rstest]
    #[tokio::test(flavor = "current_thread")]
    async fn test_noop_backend() {
        let backend = NoopBackend::new();
        assert!(!backend.try_exists(Path::new("some/path")).await.unwrap());
        assert!(backend
            .read_dir(Path::new("some/path"))
            .await
            .unwrap()
            .is_empty());
        assert!(backend
            .rename(Path::new("from"), Path::new("to"))
            .await
            .is_ok());
        assert!(backend.remove(Path::new("some/path")).await.is_ok());
        assert!(backend.remove_dir_all(Path::new("some/path")).await.is_ok());
        assert!(backend.create_dir_all(Path::new("some/path")).await.is_ok());
        assert!(backend.upload(Path::new("some/path")).await.is_ok());
        assert!(backend.download(Path::new("some/path")).await.is_ok());
        assert!(backend
            .update_local_cache(Path::new("some/path"), &AccessMode::Read)
            .await
            .is_ok());
        assert!(backend.invalidate_locally_cached_files().await.is_empty());
        assert!(backend
            .get_stats(Path::new("some/path"))
            .await
            .unwrap()
            .is_none());
    }

    #[rstest]
    #[should_panic(expected = "NoopBackend does not have a path")]
    fn test_noop_backend_path() {
        let backend = NoopBackend::new();
        let _ = backend.path();
    }
}