2020-12-17 12:05:00 +00:00
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use std::path::Path;
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use std::sync::Arc;
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use std::os::unix::io::{AsRawFd, FromRawFd};
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use std::fs::File;
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use anyhow::{bail, Error};
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use nix::dir::Dir;
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2021-11-23 16:57:00 +00:00
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use proxmox_sys::fs::lock_dir_noblock_shared;
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2021-09-27 07:58:20 +00:00
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use crate::backup_info::BackupDir;
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use crate::index::IndexFile;
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use crate::fixed_index::FixedIndexReader;
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use crate::dynamic_index::DynamicIndexReader;
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use crate::manifest::{archive_type, ArchiveType, CLIENT_LOG_BLOB_NAME, MANIFEST_BLOB_NAME};
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use crate::DataStore;
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2021-07-06 11:26:35 +00:00
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2020-12-17 12:05:00 +00:00
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/// Helper to access the contents of a datastore backup snapshot
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///
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/// This make it easy to iterate over all used chunks and files.
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pub struct SnapshotReader {
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2020-12-18 11:10:31 +00:00
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snapshot: BackupDir,
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2021-03-16 09:43:20 +00:00
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datastore_name: String,
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2020-12-17 12:05:00 +00:00
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file_list: Vec<String>,
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locked_dir: Dir,
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}
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impl SnapshotReader {
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/// Lock snapshot, reads the manifest and returns a new instance
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pub fn new(datastore: Arc<DataStore>, snapshot: BackupDir) -> Result<Self, Error> {
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let snapshot_path = datastore.snapshot_path(&snapshot);
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let locked_dir = lock_dir_noblock_shared(
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&snapshot_path,
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"snapshot",
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"locked by another operation")?;
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2021-03-16 09:43:20 +00:00
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let datastore_name = datastore.name().to_string();
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2020-12-17 12:05:00 +00:00
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let manifest = match datastore.load_manifest(&snapshot) {
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Ok((manifest, _)) => manifest,
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Err(err) => {
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bail!("manifest load error on datastore '{}' snapshot '{}' - {}",
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2021-03-16 09:43:20 +00:00
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datastore_name, snapshot, err);
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2020-12-17 12:05:00 +00:00
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}
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};
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2021-01-15 13:38:27 +00:00
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let mut client_log_path = snapshot_path;
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2020-12-17 12:05:00 +00:00
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client_log_path.push(CLIENT_LOG_BLOB_NAME);
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let mut file_list = Vec::new();
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file_list.push(MANIFEST_BLOB_NAME.to_string());
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for item in manifest.files() { file_list.push(item.filename.clone()); }
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if client_log_path.exists() {
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file_list.push(CLIENT_LOG_BLOB_NAME.to_string());
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}
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2021-03-16 09:43:20 +00:00
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Ok(Self { snapshot, datastore_name, file_list, locked_dir })
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2020-12-18 11:10:31 +00:00
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}
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/// Return the snapshot directory
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pub fn snapshot(&self) -> &BackupDir {
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&self.snapshot
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2020-12-17 12:05:00 +00:00
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}
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2021-03-16 09:43:20 +00:00
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/// Return the datastore name
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pub fn datastore_name(&self) -> &str {
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&self.datastore_name
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}
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2020-12-17 12:05:00 +00:00
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/// Returns the list of files the snapshot refers to.
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pub fn file_list(&self) -> &Vec<String> {
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&self.file_list
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}
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/// Opens a file inside the snapshot (using openat) for reading
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pub fn open_file(&self, filename: &str) -> Result<File, Error> {
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let raw_fd = nix::fcntl::openat(
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self.locked_dir.as_raw_fd(),
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Path::new(filename),
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nix::fcntl::OFlag::O_RDONLY,
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nix::sys::stat::Mode::empty(),
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)?;
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let file = unsafe { File::from_raw_fd(raw_fd) };
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Ok(file)
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}
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2021-03-10 15:37:09 +00:00
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/// Returns an iterator for all used chunks.
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2020-12-17 12:05:00 +00:00
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pub fn chunk_iterator(&self) -> Result<SnapshotChunkIterator, Error> {
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2021-12-30 11:57:37 +00:00
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SnapshotChunkIterator::new(self)
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2020-12-17 12:05:00 +00:00
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}
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}
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/// Iterates over all chunks used by a backup snapshot
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///
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/// Note: The iterator returns a `Result`, and the iterator state is
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/// undefined after the first error. So it make no sense to continue
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/// iteration after the first error.
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pub struct SnapshotChunkIterator<'a> {
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snapshot_reader: &'a SnapshotReader,
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todo_list: Vec<String>,
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2021-06-18 09:29:10 +00:00
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current_index: Option<(Arc<Box<dyn IndexFile + Send>>, usize, Vec<(usize, u64)>)>,
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2020-12-17 12:05:00 +00:00
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}
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impl <'a> Iterator for SnapshotChunkIterator<'a> {
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type Item = Result<[u8; 32], Error>;
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fn next(&mut self) -> Option<Self::Item> {
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2021-10-08 09:19:37 +00:00
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proxmox_lang::try_block!({
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2020-12-17 12:05:00 +00:00
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loop {
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if self.current_index.is_none() {
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if let Some(filename) = self.todo_list.pop() {
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let file = self.snapshot_reader.open_file(&filename)?;
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2021-06-18 09:29:10 +00:00
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let index: Box<dyn IndexFile + Send> = match archive_type(&filename)? {
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2020-12-17 12:05:00 +00:00
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ArchiveType::FixedIndex => Box::new(FixedIndexReader::new(file)?),
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ArchiveType::DynamicIndex => Box::new(DynamicIndexReader::new(file)?),
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_ => bail!("SnapshotChunkIterator: got unknown file type - internal error"),
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};
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2021-06-18 09:29:10 +00:00
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let datastore =
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DataStore::lookup_datastore(self.snapshot_reader.datastore_name())?;
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let order = datastore.get_chunks_in_order(&index, |_| false, |_| Ok(()))?;
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self.current_index = Some((Arc::new(index), 0, order));
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2020-12-17 12:05:00 +00:00
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} else {
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return Ok(None);
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}
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}
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2021-06-18 09:29:10 +00:00
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let (index, pos, list) = self.current_index.take().unwrap();
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if pos < list.len() {
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let (real_pos, _) = list[pos];
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let digest = *index.index_digest(real_pos).unwrap();
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self.current_index = Some((index, pos + 1, list));
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2020-12-17 12:05:00 +00:00
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return Ok(Some(digest));
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} else {
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// pop next index
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}
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}
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}).transpose()
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}
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}
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impl <'a> SnapshotChunkIterator<'a> {
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pub fn new(snapshot_reader: &'a SnapshotReader) -> Result<Self, Error> {
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let mut todo_list = Vec::new();
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for filename in snapshot_reader.file_list() {
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match archive_type(filename)? {
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ArchiveType::FixedIndex | ArchiveType::DynamicIndex => {
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todo_list.push(filename.to_owned());
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},
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ArchiveType::Blob => { /* no chunks, do nothing */ },
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}
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}
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Ok(Self { snapshot_reader, todo_list, current_index: None })
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}
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}
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