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use tokio_test::assert_err;
use tokio_uring::buf::fixed::{FixedBufPool, FixedBufRegistry};
use tokio_uring::buf::{BoundedBuf, BoundedBufMut};
use tokio_uring::fs::File;
use std::fs::File as StdFile;
use std::io::prelude::*;
use std::iter;
use std::mem;
use tempfile::NamedTempFile;
const HELLO: &[u8] = b"hello world...";
#[test]
fn fixed_buf_turnaround() {
tokio_uring::start(async {
let mut tempfile = tempfile();
tempfile.write_all(HELLO).unwrap();
let file = File::open(tempfile.path()).await.unwrap();
let buffers = FixedBufRegistry::new([30, 20, 10].iter().map(|&n| Vec::with_capacity(n)));
buffers.register().unwrap();
let fixed_buf = buffers.check_out(0).unwrap();
assert_eq!(fixed_buf.bytes_total(), 30);
// Can't check out the same buffer twice.
assert!(buffers.check_out(0).is_none());
// Checking out another buffer from the same registry is possible,
// but does not affect the status of the first buffer.
let fixed_buf1 = buffers.check_out(1).unwrap();
assert_eq!(fixed_buf1.bytes_total(), 20);
assert!(buffers.check_out(0).is_none());
mem::drop(fixed_buf1);
assert!(buffers.check_out(0).is_none());
let op = file.read_fixed_at(fixed_buf, 0);
// The buffer is used by the pending operation, can't check it out
// for another instance.
assert!(buffers.check_out(0).is_none());
let (res, buf) = op.await;
let n = res.unwrap();
assert_eq!(n, HELLO.len());
// The buffer is owned by `buf`, can't check it out
// for another instance.
assert!(buffers.check_out(0).is_none());
mem::drop(buf);
// The buffer has been released, check it out again.
let fixed_buf = buffers.check_out(0).unwrap();
assert_eq!(fixed_buf.bytes_total(), 30);
assert_eq!(fixed_buf.bytes_init(), HELLO.len());
});
}
#[test]
fn unregister_invalidates_checked_out_buffers() {
tokio_uring::start(async {
let mut tempfile = tempfile();
tempfile.write_all(HELLO).unwrap();
let file = File::open(tempfile.path()).await.unwrap();
let buffers = FixedBufRegistry::new([Vec::with_capacity(1024)]);
buffers.register().unwrap();
let fixed_buf = buffers.check_out(0).unwrap();
// The checked out handle keeps the buffer allocation alive.
// Meanwhile, we replace buffer registration in the kernel:
buffers.unregister().unwrap();
let buffers = FixedBufRegistry::new([Vec::with_capacity(1024)]);
buffers.register().unwrap();
// The old buffer's index no longer matches the memory area of the
// currently registered buffer, so the read operation using the old
// buffer's memory should fail.
let (res, _) = file.read_fixed_at(fixed_buf, 0).await;
assert_err!(res);
let fixed_buf = buffers.check_out(0).unwrap();
let (res, buf) = file.read_fixed_at(fixed_buf, 0).await;
let n = res.unwrap();
assert_eq!(n, HELLO.len());
assert_eq!(&buf[..], HELLO);
});
}
#[test]
fn slicing() {
tokio_uring::start(async {
let mut tempfile = tempfile();
tempfile.write_all(HELLO).unwrap();
let file = File::from_std(
StdFile::options()
.read(true)
.write(true)
.open(tempfile.path())
.unwrap(),
);
let buffers = FixedBufRegistry::new([Vec::with_capacity(1024)]);
buffers.register().unwrap();
let fixed_buf = buffers.check_out(0).unwrap();
// Read no more than 8 bytes into the fixed buffer.
let (res, slice) = file.read_fixed_at(fixed_buf.slice(..8), 3).await;
let n = res.unwrap();
assert_eq!(n, 8);
assert_eq!(slice[..], HELLO[3..11]);
let fixed_buf = slice.into_inner();
// Write from the fixed buffer, starting at offset 1,
// up to the end of the initialized bytes in the buffer.
let (res, slice) = file
.write_fixed_at(fixed_buf.slice(1..), HELLO.len() as u64)
.await;
let n = res.unwrap();
assert_eq!(n, 7);
assert_eq!(slice[..], HELLO[4..11]);
let fixed_buf = slice.into_inner();
// Read into the fixed buffer, overwriting bytes starting from offset 3
// and then extending the initialized part with as many bytes as
// the operation can read.
let (res, slice) = file.read_fixed_at(fixed_buf.slice(3..), 0).await;
let n = res.unwrap();
assert_eq!(n, HELLO.len() + 7);
assert_eq!(slice[..HELLO.len()], HELLO[..]);
assert_eq!(slice[HELLO.len()..], HELLO[4..11]);
})
}
#[test]
fn pool_next_as_concurrency_limit() {
tokio_uring::start(async move {
const BUF_SIZE: usize = 80;
let mut tempfile = tempfile();
let file = StdFile::options()
.write(true)
.open(tempfile.path())
.unwrap();
let buffers = FixedBufPool::new(iter::repeat_with(|| Vec::with_capacity(BUF_SIZE)).take(2));
buffers.register().unwrap();
let mut join_handles = vec![];
for i in 0..10 {
let mut buf = buffers.next(BUF_SIZE).await;
println!(
"[main] iteration {}: obtained buffer {}",
i,
buf.buf_index()
);
let cloned_file = file.try_clone().unwrap();
let handle = tokio_uring::spawn(async move {
let file = File::from_std(cloned_file);
let data = [b'0' + i as u8; BUF_SIZE];
buf.put_slice(&data);
let (res, buf) = file.write_fixed_all_at(buf, BUF_SIZE as u64 * i).await;
res.unwrap();
println!("[worker {}]: dropping buffer {}", i, buf.buf_index());
});
join_handles.push(handle);
}
for (i, handle) in join_handles.into_iter().enumerate() {
handle
.await
.unwrap_or_else(|e| panic!("worker {} terminated abnormally: {}", i, e));
}
mem::drop(file);
let mut content = String::new();
tempfile.read_to_string(&mut content).unwrap();
println!("{}", content);
})
}
fn tempfile() -> NamedTempFile {
NamedTempFile::new().unwrap()
}
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