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Implement std::io::Seek for tokio_util::io::SyncIoBridge #6058

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Oct 7, 2023
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Implement std::io::Seek for tokio_util::io::SyncIoBridge #6058

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12 changes: 10 additions & 2 deletions tokio-util/src/io/sync_bridge.rs
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
use std::io::{BufRead, Read, Write};
use std::io::{BufRead, Read, Seek, Write};
use tokio::io::{
AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncWrite, AsyncWriteExt,
AsyncBufRead, AsyncBufReadExt, AsyncRead, AsyncReadExt, AsyncSeek, AsyncSeekExt, AsyncWrite,
AsyncWriteExt,
};

/// Use a [`tokio::io::AsyncRead`] synchronously as a [`std::io::Read`] or
Expand Down Expand Up @@ -79,6 +80,13 @@ impl<T: AsyncWrite + Unpin> Write for SyncIoBridge<T> {
}
}

impl<T: AsyncSeek + Unpin> Seek for SyncIoBridge<T> {
fn seek(&mut self, pos: std::io::SeekFrom) -> std::io::Result<u64> {
let src = &mut self.src;
self.rt.block_on(AsyncSeekExt::seek(src, pos))
}
}

// Because https://doc.rust-lang.org/std/io/trait.Write.html#method.is_write_vectored is at the time
// of this writing still unstable, we expose this as part of a standalone method.
impl<T: AsyncWrite> SyncIoBridge<T> {
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