diff --git a/core/src/raw/oio/read/buffer_reader.rs b/core/src/raw/oio/read/buffer_reader.rs new file mode 100644 index 00000000000..24c2de17b4a --- /dev/null +++ b/core/src/raw/oio/read/buffer_reader.rs @@ -0,0 +1,466 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use bytes::BufMut; +use bytes::Bytes; +use tokio::io::ReadBuf; + +use std::cmp::min; +use std::io::SeekFrom; + +use std::task::ready; +use std::task::Context; +use std::task::Poll; + +use crate::raw::*; +use crate::*; + +/// [BufferReader] allows the underlying reader to fetch data at the buffer's size +/// and is used to amortize the IO's overhead. +pub struct BufferReader { + r: R, + cur: u64, + + buf: Vec, + filled: usize, + pos: usize, +} + +impl BufferReader { + /// Create a new [`oio::Reader`] with a buffer. + pub fn new(r: R, cap: usize) -> BufferReader { + BufferReader { + r, + cur: 0, + + buf: Vec::with_capacity(cap), + filled: 0, + pos: 0, + } + } + + /// Invalidates all data in the internal buffer. + #[inline] + fn discard_buffer(&mut self) { + self.buf.clear(); + self.pos = 0; + self.filled = 0; + } + + /// Returns the capacity of the internal buffer. + fn capacity(&self) -> usize { + self.buf.capacity() + } +} + +impl BufferReader +where + R: oio::Read, +{ + fn poll_fill_buf(&mut self, cx: &mut Context<'_>) -> Poll> { + // If we've reached the end of our internal buffer then we need to fetch + // some more data from the underlying reader. + // Branch using `>=` instead of the more correct `==` + // to tell the compiler that the pos..cap slice is always valid. + if self.pos >= self.filled { + debug_assert!(self.pos == self.filled); + + let cap = self.capacity(); + self.buf.clear(); + let dst = self.buf.spare_capacity_mut(); + let mut buf = ReadBuf::uninit(dst); + unsafe { buf.assume_init(cap) }; + + let n = ready!(self.r.poll_read(cx, buf.initialized_mut()))?; + unsafe { self.buf.set_len(n) } + + self.pos = 0; + self.filled = n; + } + + Poll::Ready(Ok(&self.buf[self.pos..self.filled])) + } + + fn consume(&mut self, amt: usize) { + let new_pos = min(self.pos + amt, self.filled); + let amt = new_pos - self.pos; + + self.pos = new_pos; + self.cur += amt as u64; + } + + fn seek_relative(&mut self, offset: i64) -> Option { + let pos = self.pos as u64; + + if let (Some(new_pos), Some(new_cur)) = ( + pos.checked_add_signed(offset), + self.cur.checked_add_signed(offset), + ) { + if new_pos <= self.filled as u64 { + self.cur = new_cur; + self.pos = new_pos as usize; + return Some(self.cur); + } + } + + None + } + + fn poll_inner_seek(&mut self, cx: &mut Context<'_>, pos: SeekFrom) -> Poll> { + let cur = ready!(self.r.poll_seek(cx, pos))?; + self.discard_buffer(); + self.cur = cur; + + Poll::Ready(Ok(cur)) + } +} + +impl oio::Read for BufferReader +where + R: oio::Read, +{ + fn poll_read(&mut self, cx: &mut Context<'_>, mut dst: &mut [u8]) -> Poll> { + // Sanity check for normal cases. + if dst.is_empty() { + return Poll::Ready(Ok(0)); + } + + // If we don't have any buffered data and we're doing a massive read + // (larger than our internal buffer), bypass our internal buffer + // entirely. + if self.pos == self.filled && dst.len() >= self.capacity() { + let res = ready!(self.r.poll_read(cx, dst)); + self.discard_buffer(); + return Poll::Ready(res); + } + + let rem = ready!(self.poll_fill_buf(cx))?; + let amt = min(rem.len(), dst.len()); + dst.put(&rem[..amt]); + self.consume(amt); + Poll::Ready(Ok(amt)) + } + + fn poll_seek(&mut self, cx: &mut Context<'_>, pos: SeekFrom) -> Poll> { + match pos { + SeekFrom::Start(new_pos) => { + // TODO(weny): Check the overflowing. + let Some(offset) = (new_pos as i64).checked_sub(self.cur as i64) else { + return self.poll_inner_seek(cx, pos); + }; + + match self.seek_relative(offset) { + Some(cur) => Poll::Ready(Ok(cur)), + None => self.poll_inner_seek(cx, pos), + } + } + SeekFrom::Current(offset) => match self.seek_relative(offset) { + Some(cur) => Poll::Ready(Ok(cur)), + None => self.poll_inner_seek(cx, pos), + }, + SeekFrom::End(_) => self.poll_inner_seek(cx, pos), + } + } + + fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll>> { + match ready!(self.poll_fill_buf(cx)) { + Ok(bytes) => { + if bytes.is_empty() { + return Poll::Ready(None); + } + + let bytes = Bytes::copy_from_slice(bytes); + self.consume(bytes.len()); + Poll::Ready(Some(Ok(bytes))) + } + Err(err) => Poll::Ready(Some(Err(err))), + } + } +} + +#[cfg(test)] +mod tests { + use std::io::SeekFrom; + use std::pin::Pin; + use std::sync::Arc; + + use async_trait::async_trait; + use bytes::Bytes; + use futures::AsyncRead; + use futures::AsyncReadExt; + use futures::AsyncSeekExt; + use rand::prelude::*; + use sha2::Digest; + use sha2::Sha256; + + use crate::raw::oio::RangeReader; + + use super::*; + + // Generate bytes between [4MiB, 16MiB) + fn gen_bytes() -> (Bytes, usize) { + let mut rng = thread_rng(); + + let size = rng.gen_range(4 * 1024 * 1024..16 * 1024 * 1024); + let mut content = vec![0; size]; + rng.fill_bytes(&mut content); + + (Bytes::from(content), size) + } + + #[derive(Debug, Clone, Default)] + struct MockReadService { + data: Bytes, + } + + impl MockReadService { + fn new(data: Bytes) -> Self { + Self { data } + } + } + + #[async_trait] + impl Accessor for MockReadService { + type Reader = MockReader; + type BlockingReader = (); + type Writer = (); + type BlockingWriter = (); + type Lister = (); + type BlockingLister = (); + + fn info(&self) -> AccessorInfo { + let mut am = AccessorInfo::default(); + am.set_native_capability(Capability { + read: true, + ..Default::default() + }); + + am + } + + async fn read(&self, _: &str, args: OpRead) -> Result<(RpRead, Self::Reader)> { + let bs = args.range().apply_on_bytes(self.data.clone()); + + Ok(( + RpRead::new(), + MockReader { + inner: futures::io::Cursor::new(bs.into()), + }, + )) + } + } + + #[derive(Debug, Clone, Default)] + struct MockReader { + inner: futures::io::Cursor>, + } + + impl oio::Read for MockReader { + fn poll_read(&mut self, cx: &mut Context, buf: &mut [u8]) -> Poll> { + Pin::new(&mut self.inner).poll_read(cx, buf).map_err(|err| { + Error::new(ErrorKind::Unexpected, "read data from mock").set_source(err) + }) + } + + fn poll_seek(&mut self, cx: &mut Context<'_>, pos: SeekFrom) -> Poll> { + let (_, _) = (cx, pos); + + Poll::Ready(Err(Error::new( + ErrorKind::Unsupported, + "output reader doesn't support seeking", + ))) + } + + fn poll_next(&mut self, cx: &mut Context<'_>) -> Poll>> { + let mut bs = vec![0; 4 * 1024]; + let n = ready!(Pin::new(&mut self.inner) + .poll_read(cx, &mut bs) + .map_err( + |err| Error::new(ErrorKind::Unexpected, "read data from mock").set_source(err) + )?); + if n == 0 { + Poll::Ready(None) + } else { + Poll::Ready(Some(Ok(Bytes::from(bs[..n].to_vec())))) + } + } + } + + #[tokio::test] + async fn test_read_from_buf() -> anyhow::Result<()> { + let bs = Bytes::copy_from_slice(&b"Hello, World!"[..]); + + let acc = Arc::new(MockReadService::new(bs.clone())); + let r = Box::new(RangeReader::new(acc, "x", OpRead::default())) as oio::Reader; + + let buf_cap = 10; + let mut r = Box::new(BufferReader::new(r, buf_cap)) as oio::Reader; + let mut dst = [0u8; 5]; + + let nread = r.read(&mut dst).await?; + assert_eq!(nread, dst.len()); + assert_eq!(&dst, b"Hello"); + + let mut dst = [0u8; 5]; + let nread = r.read(&mut dst).await?; + assert_eq!(nread, dst.len()); + assert_eq!(&dst, b", Wor"); + + let mut dst = [0u8; 3]; + let nread = r.read(&mut dst).await?; + assert_eq!(nread, dst.len()); + assert_eq!(&dst, b"ld!"); + + Ok(()) + } + + #[tokio::test] + async fn test_seek() -> anyhow::Result<()> { + let bs = Bytes::copy_from_slice(&b"Hello, World!"[..]); + let acc = Arc::new(MockReadService::new(bs.clone())); + let r = Box::new(RangeReader::new(acc, "x", OpRead::default())) as oio::Reader; + + let buf_cap = 10; + let mut r = Box::new(BufferReader::new(r, buf_cap)) as oio::Reader; + + // The underlying reader buffers the b"Hello, Wor". + let mut dst = [0u8; 5]; + let nread = r.read(&mut dst).await?; + assert_eq!(nread, dst.len()); + assert_eq!(&dst, b"Hello"); + + let pos = r.seek(SeekFrom::Start(7)).await?; + assert_eq!(pos, 7); + let mut dst = [0u8; 5]; + let nread = r.read(&mut dst).await?; + assert_eq!(&dst[..nread], &bs[7..10]); + assert_eq!(nread, 3); + + // Should perform a relative seek. + let pos = r.seek(SeekFrom::Start(0)).await?; + assert_eq!(pos, 0); + let mut dst = [0u8; 9]; + let nread = r.read(&mut dst).await?; + assert_eq!(&dst[..nread], &bs[0..9]); + assert_eq!(nread, 9); + + // Should perform a non-relative seek. + let pos = r.seek(SeekFrom::Start(11)).await?; + assert_eq!(pos, 11); + let mut dst = [0u8; 9]; + let nread = r.read(&mut dst).await?; + assert_eq!(&dst[..nread], &bs[11..13]); + assert_eq!(nread, 2); + + Ok(()) + } + + #[tokio::test] + async fn test_read_all() -> anyhow::Result<()> { + let (bs, _) = gen_bytes(); + let acc = Arc::new(MockReadService::new(bs.clone())); + + let r = Box::new(RangeReader::new( + acc, + "x", + OpRead::default().with_range(BytesRange::from(..)), + )) as oio::Reader; + + let mut r = Box::new(BufferReader::new(r, 4096 * 1024)) as oio::Reader; + + let mut buf = Vec::new(); + r.read_to_end(&mut buf).await?; + assert_eq!(bs.len(), buf.len(), "read size"); + assert_eq!( + format!("{:x}", Sha256::digest(&bs)), + format!("{:x}", Sha256::digest(&buf)), + "read content" + ); + + let n = r.seek(SeekFrom::Start(0)).await?; + assert_eq!(n, 0, "seek position must be 0"); + + let mut buf = Vec::new(); + r.read_to_end(&mut buf).await?; + assert_eq!(bs.len(), buf.len(), "read twice size"); + assert_eq!( + format!("{:x}", Sha256::digest(&bs)), + format!("{:x}", Sha256::digest(&buf)), + "read twice content" + ); + + Ok(()) + } + + #[tokio::test] + async fn test_read_part() -> anyhow::Result<()> { + let (bs, _) = gen_bytes(); + let acc = Arc::new(MockReadService::new(bs.clone())); + + let r = Box::new(RangeReader::new( + acc, + "x", + OpRead::default().with_range(BytesRange::from(4096..4096 + 4096)), + )) as oio::Reader; + let mut r = Box::new(BufferReader::new(r, 4096 * 1024)) as oio::Reader; + + let mut buf = Vec::new(); + r.read_to_end(&mut buf).await?; + assert_eq!(4096, buf.len(), "read size"); + assert_eq!( + format!("{:x}", Sha256::digest(&bs[4096..4096 + 4096])), + format!("{:x}", Sha256::digest(&buf)), + "read content" + ); + + let n = r.seek(SeekFrom::Start(0)).await?; + assert_eq!(n, 0, "seek position must be 0"); + + let mut buf = Vec::new(); + r.read_to_end(&mut buf).await?; + assert_eq!(4096, buf.len(), "read twice size"); + assert_eq!( + format!("{:x}", Sha256::digest(&bs[4096..4096 + 4096])), + format!("{:x}", Sha256::digest(&buf)), + "read twice content" + ); + + let n = r.seek(SeekFrom::Start(1024)).await?; + assert_eq!(1024, n, "seek to 1024"); + + let mut buf = vec![0; 1024]; + r.read_exact(&mut buf).await?; + assert_eq!( + format!("{:x}", Sha256::digest(&bs[4096 + 1024..4096 + 2048])), + format!("{:x}", Sha256::digest(&buf)), + "read after seek 1024" + ); + + let n = r.seek(SeekFrom::Current(1024)).await?; + assert_eq!(3072, n, "seek to 3072"); + + let mut buf = vec![0; 1024]; + r.read_exact(&mut buf).await?; + assert_eq!( + format!("{:x}", Sha256::digest(&bs[4096 + 3072..4096 + 3072 + 1024])), + format!("{:x}", Sha256::digest(&buf)), + "read after seek to 3072" + ); + + Ok(()) + } +} diff --git a/core/src/raw/oio/read/mod.rs b/core/src/raw/oio/read/mod.rs index 5f7d5d93a16..d0edf682dc4 100644 --- a/core/src/raw/oio/read/mod.rs +++ b/core/src/raw/oio/read/mod.rs @@ -48,3 +48,6 @@ pub use std_read::StdReader; mod lazy_read; pub use lazy_read::LazyReader; + +mod buffer_reader; +pub use buffer_reader::BufferReader; diff --git a/core/src/raw/ops.rs b/core/src/raw/ops.rs index 5e870efab89..dbf43bfaa79 100644 --- a/core/src/raw/ops.rs +++ b/core/src/raw/ops.rs @@ -307,6 +307,9 @@ pub struct OpRead { override_cache_control: Option, override_content_disposition: Option, version: Option, + /// The maximum buffer capability. + /// `None` stand for disable buffer. + buffer: Option, } impl OpRead { @@ -409,6 +412,18 @@ impl OpRead { pub fn version(&self) -> Option<&str> { self.version.as_deref() } + + /// Set the buffer capability. + pub fn with_buffer(mut self, buffer: usize) -> Self { + self.buffer = Some(buffer); + + self + } + + /// Get buffer from option. + pub fn buffer(&self) -> Option { + self.buffer + } } /// Args for `stat` operation. diff --git a/core/src/types/operator/operator_futures.rs b/core/src/types/operator/operator_futures.rs index 76b42e84ef0..8c75f56b3cf 100644 --- a/core/src/types/operator/operator_futures.rs +++ b/core/src/types/operator/operator_futures.rs @@ -408,6 +408,12 @@ impl FutureReader { self.0 = self.0.map_args(|args| args.with_if_none_match(v)); self } + + /// Set the buffer capability to enable `BufferReader`. + pub fn buffer(mut self, v: usize) -> Self { + self.0 = self.0.map_args(|args| args.with_buffer(v)); + self + } } impl Future for FutureReader {