drop dynamic_index.rs duplicate in pbs-client
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
This commit is contained in:
Wolfgang Bumiller
parent
7380c48dff
commit
f66d66aafe
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@ -1,230 +0,0 @@
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use std::io::{self, Seek, SeekFrom};
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use std::ops::Range;
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use std::sync::{Arc, Mutex};
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use std::task::Context;
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use std::pin::Pin;
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use anyhow::{bail, format_err, Error};
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use pxar::accessor::{MaybeReady, ReadAt, ReadAtOperation};
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use pbs_datastore::dynamic_index::DynamicIndexReader;
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use pbs_datastore::read_chunk::ReadChunk;
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use pbs_datastore::index::IndexFile;
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use pbs_tools::lru_cache::LruCache;
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struct CachedChunk {
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range: Range<u64>,
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data: Vec<u8>,
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}
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impl CachedChunk {
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/// Perform sanity checks on the range and data size:
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pub fn new(range: Range<u64>, data: Vec<u8>) -> Result<Self, Error> {
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if data.len() as u64 != range.end - range.start {
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bail!(
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"read chunk with wrong size ({} != {})",
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data.len(),
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range.end - range.start,
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);
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}
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Ok(Self { range, data })
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}
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}
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pub struct BufferedDynamicReader<S> {
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store: S,
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index: DynamicIndexReader,
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archive_size: u64,
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read_buffer: Vec<u8>,
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buffered_chunk_idx: usize,
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buffered_chunk_start: u64,
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read_offset: u64,
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lru_cache: LruCache<usize, CachedChunk>,
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}
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struct ChunkCacher<'a, S> {
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store: &'a mut S,
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index: &'a DynamicIndexReader,
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}
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impl<'a, S: ReadChunk> pbs_tools::lru_cache::Cacher<usize, CachedChunk> for ChunkCacher<'a, S> {
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fn fetch(&mut self, index: usize) -> Result<Option<CachedChunk>, Error> {
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let info = match self.index.chunk_info(index) {
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Some(info) => info,
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None => bail!("chunk index out of range"),
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};
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let range = info.range;
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let data = self.store.read_chunk(&info.digest)?;
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CachedChunk::new(range, data).map(Some)
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}
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}
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impl<S: ReadChunk> BufferedDynamicReader<S> {
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pub fn new(index: DynamicIndexReader, store: S) -> Self {
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let archive_size = index.index_bytes();
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Self {
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store,
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index,
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archive_size,
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read_buffer: Vec::with_capacity(1024 * 1024),
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buffered_chunk_idx: 0,
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buffered_chunk_start: 0,
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read_offset: 0,
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lru_cache: LruCache::new(32),
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}
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}
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pub fn archive_size(&self) -> u64 {
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self.archive_size
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}
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fn buffer_chunk(&mut self, idx: usize) -> Result<(), Error> {
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//let (start, end, data) = self.lru_cache.access(
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let cached_chunk = self.lru_cache.access(
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idx,
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&mut ChunkCacher {
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store: &mut self.store,
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index: &self.index,
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},
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)?.ok_or_else(|| format_err!("chunk not found by cacher"))?;
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// fixme: avoid copy
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self.read_buffer.clear();
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self.read_buffer.extend_from_slice(&cached_chunk.data);
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self.buffered_chunk_idx = idx;
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self.buffered_chunk_start = cached_chunk.range.start;
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//println!("BUFFER {} {}", self.buffered_chunk_start, end);
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Ok(())
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}
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}
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impl<S: ReadChunk> pbs_tools::io::BufferedRead for BufferedDynamicReader<S> {
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fn buffered_read(&mut self, offset: u64) -> Result<&[u8], Error> {
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if offset == self.archive_size {
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return Ok(&self.read_buffer[0..0]);
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}
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let buffer_len = self.read_buffer.len();
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let index = &self.index;
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// optimization for sequential read
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if buffer_len > 0
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&& ((self.buffered_chunk_idx + 1) < index.index().len())
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&& (offset >= (self.buffered_chunk_start + (self.read_buffer.len() as u64)))
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{
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let next_idx = self.buffered_chunk_idx + 1;
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let next_end = index.chunk_end(next_idx);
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if offset < next_end {
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self.buffer_chunk(next_idx)?;
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let buffer_offset = (offset - self.buffered_chunk_start) as usize;
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return Ok(&self.read_buffer[buffer_offset..]);
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}
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}
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if (buffer_len == 0)
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|| (offset < self.buffered_chunk_start)
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|| (offset >= (self.buffered_chunk_start + (self.read_buffer.len() as u64)))
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{
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let end_idx = index.index().len() - 1;
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let end = index.chunk_end(end_idx);
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let idx = index.binary_search(0, 0, end_idx, end, offset)?;
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self.buffer_chunk(idx)?;
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}
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let buffer_offset = (offset - self.buffered_chunk_start) as usize;
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Ok(&self.read_buffer[buffer_offset..])
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}
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}
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impl<S: ReadChunk> std::io::Read for BufferedDynamicReader<S> {
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fn read(&mut self, buf: &mut [u8]) -> Result<usize, std::io::Error> {
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use pbs_tools::io::BufferedRead;
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use std::io::{Error, ErrorKind};
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let data = match self.buffered_read(self.read_offset) {
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Ok(v) => v,
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Err(err) => return Err(Error::new(ErrorKind::Other, err.to_string())),
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};
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let n = if data.len() > buf.len() {
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buf.len()
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} else {
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data.len()
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};
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buf[0..n].copy_from_slice(&data[0..n]);
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self.read_offset += n as u64;
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Ok(n)
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}
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}
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impl<S: ReadChunk> std::io::Seek for BufferedDynamicReader<S> {
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fn seek(&mut self, pos: SeekFrom) -> Result<u64, std::io::Error> {
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let new_offset = match pos {
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SeekFrom::Start(start_offset) => start_offset as i64,
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SeekFrom::End(end_offset) => (self.archive_size as i64) + end_offset,
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SeekFrom::Current(offset) => (self.read_offset as i64) + offset,
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};
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use std::io::{Error, ErrorKind};
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if (new_offset < 0) || (new_offset > (self.archive_size as i64)) {
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return Err(Error::new(
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ErrorKind::Other,
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format!(
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"seek is out of range {} ([0..{}])",
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new_offset, self.archive_size
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),
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));
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}
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self.read_offset = new_offset as u64;
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Ok(self.read_offset)
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}
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}
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/// This is a workaround until we have cleaned up the chunk/reader/... infrastructure for better
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/// async use!
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///
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/// Ideally BufferedDynamicReader gets replaced so the LruCache maps to `BroadcastFuture<Chunk>`,
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/// so that we can properly access it from multiple threads simultaneously while not issuing
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/// duplicate simultaneous reads over http.
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#[derive(Clone)]
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pub struct LocalDynamicReadAt<R: ReadChunk> {
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inner: Arc<Mutex<BufferedDynamicReader<R>>>,
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}
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impl<R: ReadChunk> LocalDynamicReadAt<R> {
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pub fn new(inner: BufferedDynamicReader<R>) -> Self {
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Self {
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inner: Arc::new(Mutex::new(inner)),
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}
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}
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}
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impl<R: ReadChunk> ReadAt for LocalDynamicReadAt<R> {
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fn start_read_at<'a>(
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self: Pin<&'a Self>,
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_cx: &mut Context,
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buf: &'a mut [u8],
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offset: u64,
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) -> MaybeReady<io::Result<usize>, ReadAtOperation<'a>> {
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use std::io::Read;
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MaybeReady::Ready(tokio::task::block_in_place(move || {
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let mut reader = self.inner.lock().unwrap();
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reader.seek(SeekFrom::Start(offset))?;
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Ok(reader.read(buf)?)
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}))
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}
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fn poll_complete<'a>(
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self: Pin<&'a Self>,
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_op: ReadAtOperation<'a>,
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) -> MaybeReady<io::Result<usize>, ReadAtOperation<'a>> {
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panic!("LocalDynamicReadAt::start_read_at returned Pending");
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}
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}
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@ -4,7 +4,6 @@
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//! server using https.
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pub mod catalog_shell;
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pub mod dynamic_index;
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pub mod pxar;
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pub mod tools;
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