97 lines
3.5 KiB
Rust
97 lines
3.5 KiB
Rust
use crate::Data;
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use crate::error::Error;
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use crate::helpers::compression;
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use log::error;
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use std::fs::create_dir_all;
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use std::path::Path;
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use std::thread;
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use std::time::{Duration};
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use tempfile::TempDir;
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pub fn load_snapshot(
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db_path: &str,
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snapshot_path: &Path,
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ignore_snapshot_if_db_exists: bool,
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ignore_missing_snapshot: bool
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) -> Result<(), Error> {
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let db_path = Path::new(db_path);
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if !db_path.exists() && snapshot_path.exists() {
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compression::from_tar_gz(snapshot_path, db_path)
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} else if db_path.exists() && !ignore_snapshot_if_db_exists {
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Err(Error::Internal(format!("database already exists at {:?}, try to delete it or rename it", db_path.canonicalize().unwrap_or(db_path.into()))))
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} else if !snapshot_path.exists() && !ignore_missing_snapshot {
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Err(Error::Internal(format!("snapshot doesn't exist at {:?}", snapshot_path.canonicalize().unwrap_or(snapshot_path.into()))))
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} else {
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Ok(())
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}
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}
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pub fn create_snapshot(data: &Data, snapshot_path: &Path) -> Result<(), Error> {
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let tmp_dir = TempDir::new()?;
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data.db.copy_and_compact_to_path(tmp_dir.path())?;
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compression::to_tar_gz(tmp_dir.path(), snapshot_path).map_err(|e| Error::Internal(format!("something went wrong during snapshot compression: {}", e)))
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}
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pub fn schedule_snapshot(data: Data, snapshot_dir: &Path, time_gap_s: u64) -> Result<(), Error> {
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if snapshot_dir.file_name().is_none() {
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return Err(Error::Internal("invalid snapshot file path".to_string()));
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}
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let db_name = Path::new(&data.db_path).file_name().ok_or_else(|| Error::Internal("invalid database name".to_string()))?;
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create_dir_all(snapshot_dir)?;
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let snapshot_path = snapshot_dir.join(format!("{}.snapshot", db_name.to_str().unwrap_or("data.ms")));
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thread::spawn(move || loop {
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if let Err(e) = create_snapshot(&data, &snapshot_path) {
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error!("Unsuccessful snapshot creation: {}", e);
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}
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thread::sleep(Duration::from_secs(time_gap_s));
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});
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Ok(())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::io::prelude::*;
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use std::fs;
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#[test]
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fn test_pack_unpack() {
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let tempdir = TempDir::new().unwrap();
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let test_dir = tempdir.path();
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let src_dir = test_dir.join("src");
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let dest_dir = test_dir.join("complex/destination/path/");
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let archive_path = test_dir.join("archive.snapshot");
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let file_1_relative = Path::new("file1.txt");
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let subdir_relative = Path::new("subdir/");
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let file_2_relative = Path::new("subdir/file2.txt");
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create_dir_all(src_dir.join(subdir_relative)).unwrap();
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fs::File::create(src_dir.join(file_1_relative)).unwrap().write_all(b"Hello_file_1").unwrap();
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fs::File::create(src_dir.join(file_2_relative)).unwrap().write_all(b"Hello_file_2").unwrap();
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assert!(compression::to_tar_gz(&src_dir, &archive_path).is_ok());
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assert!(archive_path.exists());
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assert!(load_snapshot(&dest_dir.to_str().unwrap(), &archive_path, false, false).is_ok());
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assert!(dest_dir.exists());
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assert!(dest_dir.join(file_1_relative).exists());
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assert!(dest_dir.join(subdir_relative).exists());
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assert!(dest_dir.join(file_2_relative).exists());
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let contents = fs::read_to_string(dest_dir.join(file_1_relative)).unwrap();
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assert_eq!(contents, "Hello_file_1");
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let contents = fs::read_to_string(dest_dir.join(file_2_relative)).unwrap();
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assert_eq!(contents, "Hello_file_2");
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}
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}
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