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use anyhow::{Context, Result};
use forge_domain::Snapshot;
use forge_fs::ForgeFS;
/// Implementation of the SnapshotService
#[derive(Debug)]
pub struct SnapshotService {
/// Base directory for storing snapshots
snapshots_directory: PathBuf,
}
impl SnapshotService {
/// Create a new FileSystemSnapshotService with a specific home path
pub fn new(snapshot_base_dir: PathBuf) -> Self {
Self { snapshots_directory: snapshot_base_dir }
}
}
impl SnapshotService {
pub async fn create_snapshot(&self, path: PathBuf) -> Result<Snapshot> {
let snapshot = Snapshot::create(path)?;
// Create intermediary directories if they don't exist
let snapshot_path = snapshot.snapshot_path(Some(self.snapshots_directory.clone()));
if let Some(parent) = PathBuf::from(&snapshot_path).parent() {
ForgeFS::create_dir_all(parent).await?;
}
let content = ForgeFS::read(&snapshot.path).await?;
let path = snapshot.snapshot_path(Some(self.snapshots_directory.clone()));
ForgeFS::write(path, content).await?;
Ok(snapshot)
}
/// Find the most recent snapshot for a given path based on filename
/// timestamp
async fn find_recent_snapshot(snapshot_dir: &PathBuf) -> Result<Option<PathBuf>> {
let mut latest_path = None;
let mut latest_filename = None;
let mut dir = ForgeFS::read_dir(&snapshot_dir).await?;
while let Some(entry) = dir.next_entry().await? {
let filename = entry.file_name().to_string_lossy().to_string();
if filename.ends_with(".snap")
&& (latest_filename.is_none() || filename > latest_filename.clone().unwrap())
{
latest_filename = Some(filename);
latest_path = Some(entry.path());
}
}
Ok(latest_path)
}
pub async fn undo_snapshot(&self, path: PathBuf) -> Result<()> {
let snapshot = Snapshot::create(path.clone())?;
// All the snaps for `path` are stored in `snapshot.path_hash()` directory.
let snapshot_dir = self.snapshots_directory.join(snapshot.path_hash());
// Check if the `snapshot_dir` exists
if !ForgeFS::exists(&snapshot_dir) {
return Err(anyhow::anyhow!("No snapshots found for {path:?}"));
}
// Retrieve the latest snapshot path
let snapshot_path = Self::find_recent_snapshot(&snapshot_dir)
.await?
.context(format!("No valid snapshots found for {path:?}"))?;
// Restore the content
let content = ForgeFS::read(&snapshot_path).await?;
ForgeFS::write(&path, content).await?;
// Remove the used snapshot
ForgeFS::remove_file(&snapshot_path).await?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use tempfile::TempDir;
use super::*;
// Test helpers
struct TestContext {
_temp_dir: TempDir,
_snapshots_dir: PathBuf,
test_file: PathBuf,
service: SnapshotService,
}
impl TestContext {
async fn new() -> Result<Self> {
let temp_dir = TempDir::new()?;
let snapshots_dir = temp_dir.path().join("snapshots");
// Canonicalize the temp directory path to ensure consistency
let temp_path = temp_dir
.path()
.canonicalize()
.unwrap_or_else(|_| temp_dir.path().to_path_buf());
let test_file = temp_path.join("test.txt");
let service = SnapshotService::new(snapshots_dir.clone());
Ok(Self {
_temp_dir: temp_dir,
_snapshots_dir: snapshots_dir,
test_file,
service,
})
}
async fn write_content(&self, content: &str) -> Result<()> {
ForgeFS::write(&self.test_file, content.as_bytes()).await
}
async fn read_content(&self) -> Result<String> {
let content = ForgeFS::read(&self.test_file).await?;
Ok(String::from_utf8(content)?)
}
async fn create_snapshot(&self) -> Result<Snapshot> {
self.service.create_snapshot(self.test_file.clone()).await
}
async fn undo_snapshot(&self) -> Result<()> {
self.service.undo_snapshot(self.test_file.clone()).await
}
}
#[tokio::test]
async fn test_create_snapshot() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
let test_content = "Hello, World!";
// Act
ctx.write_content(test_content).await?;
let snapshot = ctx.create_snapshot().await?;
// Assert
let snapshot_content = ForgeFS::read(&snapshot.path).await?;
assert_eq!(String::from_utf8(snapshot_content)?, test_content);
Ok(())
}
#[tokio::test]
async fn test_undo_snapshot() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
let initial_content = "Initial content";
let modified_content = "Modified content";
// Act
ctx.write_content(initial_content).await?;
ctx.create_snapshot().await?;
ctx.write_content(modified_content).await?;
ctx.undo_snapshot().await?;
// Assert
assert_eq!(ctx.read_content().await?, initial_content);
Ok(())
}
#[tokio::test]
async fn test_undo_snapshot_no_snapshots() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
// Act
ctx.write_content("test content").await?;
let result = ctx.undo_snapshot().await;
// Assert
assert!(result.is_err());
assert!(
result
.unwrap_err()
.to_string()
.contains("No snapshots found")
);
Ok(())
}
#[tokio::test]
async fn test_undo_snapshot_after_file_deletion() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
let initial_content = "Initial content";
// Act
ctx.write_content(initial_content).await?;
ctx.create_snapshot().await?;
ForgeFS::remove_file(&ctx.test_file).await?;
// Assert - undo should succeed and recreate the file from snapshot
ctx.undo_snapshot().await?;
assert_eq!(ctx.read_content().await?, initial_content);
Ok(())
}
#[tokio::test]
async fn test_multiple_snapshots() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
// Act
ctx.write_content("Initial content").await?;
ctx.create_snapshot().await?;
ctx.write_content("Second content").await?;
ctx.create_snapshot().await?;
ctx.write_content("Final content").await?;
ctx.undo_snapshot().await?;
// Assert
assert_eq!(ctx.read_content().await?, "Second content");
Ok(())
}
#[tokio::test]
async fn test_multiple_snapshots_undo_twice() -> Result<()> {
// Arrange
let ctx = TestContext::new().await?;
// Act
ctx.write_content("Initial content").await?;
ctx.create_snapshot().await?;
ctx.write_content("Second content").await?;
ctx.create_snapshot().await?;
ctx.write_content("Final content").await?;
ctx.undo_snapshot().await?;
ctx.undo_snapshot().await?;
// Assert
assert_eq!(ctx.read_content().await?, "Initial content");
Ok(())
}
}
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