109 lines
3.3 KiB
Rust
109 lines
3.3 KiB
Rust
use std::path::Path;
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use std::{fs, io};
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use crate::error::BakareError;
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use crate::index::{Index, IndexIterator, ItemVersion};
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use crate::repository_item::RepositoryItem;
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use sha2::Digest;
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use sha2::Sha512;
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use std::fs::File;
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use std::io::BufReader;
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/// represents a place where backup is stored an can be restored from.
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/// right now only on-disk directory storage is supported
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/// repository always knows the newest version of the index and is responsible for syncing the index to disk
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/// and making sure that different threads can access index in parallel
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pub struct Repository<'a> {
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/// absolute path to where the repository is stored on disk
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path: &'a Path,
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index: Index,
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}
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pub struct RepositoryIterator<'a> {
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index_iterator: IndexIterator<'a>,
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}
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impl<'a> Iterator for RepositoryIterator<'a> {
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type Item = RepositoryItem;
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fn next(&mut self) -> Option<Self::Item> {
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self.index_iterator.next()
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}
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}
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impl<'a> Repository<'a> {
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pub fn init(path: &Path) -> Result<(), BakareError> {
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let index = Index::new(path);
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index.save()?;
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Ok(())
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}
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pub fn open(path: &Path) -> Result<Repository, BakareError> {
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if !path.is_absolute() {
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return Err(BakareError::RepositoryPathNotAbsolute);
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}
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let index = Index::load(path)?;
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Ok(Repository { path, index })
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}
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pub fn iter(&self) -> RepositoryIterator {
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RepositoryIterator {
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index_iterator: self.index.iter(),
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}
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}
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pub fn store(&mut self, source_path: &Path) -> Result<(), BakareError> {
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if !source_path.is_absolute() {
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return Err(BakareError::PathToStoreNotAbsolute);
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}
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let version = Repository::calculate_version(source_path)?;
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let destination_path = self.path.join(version.to_string());
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let destination_path = Path::new(&destination_path);
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if source_path.is_file() {
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fs::create_dir_all(destination_path.parent().unwrap())?;
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fs::copy(source_path, destination_path)?;
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self.index.remember(RepositoryItem::from(
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source_path,
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destination_path,
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destination_path.strip_prefix(self.path)?,
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version,
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));
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self.index.save()?;
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}
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Ok(())
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}
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fn calculate_version(source_path: &Path) -> Result<ItemVersion, BakareError> {
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let source_file = File::open(source_path)?;
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let mut reader = BufReader::new(source_file);
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let mut hasher = Sha512::new();
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io::copy(&mut reader, &mut hasher)?;
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Ok(hasher.result().as_slice().into())
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}
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pub fn item_by_source_path_and_version(
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&self,
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path: &Path,
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version: &ItemVersion,
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) -> Result<Option<RepositoryItem>, BakareError> {
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if !path.is_absolute() {
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return Err(BakareError::RepositoryPathNotAbsolute);
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}
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Ok(self
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.iter()
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.find(|i| i.original_source_path() == path && i.version() == version))
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}
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pub fn item_by_source_path(&self, path: &Path) -> Result<Option<RepositoryItem>, BakareError> {
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if !path.is_absolute() {
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return Err(BakareError::RepositoryPathNotAbsolute);
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}
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Ok(self.iter().find(|i| i.original_source_path() == path))
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}
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}
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