102 lines
2.8 KiB
Rust
102 lines
2.8 KiB
Rust
use futures::executor::block_on;
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use futures::future::{Future, FutureExt};
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use futures::io::{AsyncBufReadExt, Cursor};
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use futures::stream::{self, StreamExt, TryStreamExt};
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use futures::task::Poll;
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use futures::AsyncRead;
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use futures_test::io::AsyncReadTestExt;
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use futures_test::task::noop_context;
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fn run<F: Future + Unpin>(mut f: F) -> F::Output {
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let mut cx = noop_context();
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loop {
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if let Poll::Ready(x) = f.poll_unpin(&mut cx) {
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return x;
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}
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}
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}
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struct IOErrorRead(bool);
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impl AsyncRead for IOErrorRead {
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fn poll_read(
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mut self: std::pin::Pin<&mut Self>,
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_cx: &mut std::task::Context<'_>,
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b: &mut [u8],
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) -> Poll<std::io::Result<usize>> {
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if self.0 {
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Poll::Ready(Err(std::io::ErrorKind::InvalidInput.into()))
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} else {
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self.0 = true;
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b[..16].fill(b'x');
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Ok(16).into()
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}
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}
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}
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#[test]
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fn read_line() {
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let mut buf = Cursor::new(b"12");
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let mut v = String::new();
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assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 2);
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assert_eq!(v, "12");
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let mut buf = Cursor::new(b"12\n\n");
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let mut v = String::new();
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assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 3);
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assert_eq!(v, "12\n");
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v.clear();
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assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 1);
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assert_eq!(v, "\n");
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v.clear();
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assert_eq!(block_on(buf.read_line(&mut v)).unwrap(), 0);
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assert_eq!(v, "");
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}
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#[test]
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fn read_line_drop() {
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// string contents should be preserved if the future is dropped
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let mut buf = Cursor::new(b"12\n\n");
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let mut v = String::from("abc");
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drop(buf.read_line(&mut v));
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assert_eq!(v, "abc");
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}
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#[test]
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fn read_line_io_error() {
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let mut r = futures::io::BufReader::new(IOErrorRead(false));
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let _ = block_on(r.read_line(&mut String::new()));
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}
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#[test]
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fn read_line_utf8_error() {
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let mut buf = Cursor::new(b"12\xFF\n\n");
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let mut v = String::from("abc");
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let res = block_on(buf.read_line(&mut v));
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assert_eq!(res.unwrap_err().kind(), std::io::ErrorKind::InvalidData);
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assert_eq!(v, "abc");
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}
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#[test]
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fn maybe_pending() {
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let mut buf = b"12".interleave_pending();
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let mut v = String::new();
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assert_eq!(run(buf.read_line(&mut v)).unwrap(), 2);
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assert_eq!(v, "12");
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let mut buf =
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stream::iter(vec![&b"12"[..], &b"\n\n"[..]]).map(Ok).into_async_read().interleave_pending();
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let mut v = String::new();
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assert_eq!(run(buf.read_line(&mut v)).unwrap(), 3);
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assert_eq!(v, "12\n");
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v.clear();
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assert_eq!(run(buf.read_line(&mut v)).unwrap(), 1);
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assert_eq!(v, "\n");
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v.clear();
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assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);
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assert_eq!(v, "");
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v.clear();
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assert_eq!(run(buf.read_line(&mut v)).unwrap(), 0);
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assert_eq!(v, "");
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}
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