mirror of
https://github.com/tokio-rs/tokio.git
synced 2026-08-26 00:00:16 +02:00
Roman
88a7030f73
* move src/io.rs -> src/io/mod.rs
* move src/read.rs -> src/io/read.rs
* move src/read_exact.rs -> src/io/read_exact.rs
* move src/read_until.rs -> src/io/read_until.rs
* move src/read_to_end.rs -> src/io/read_to_end.rs
* move src/flush.rs -> src/io/flush.rs
* move src/copy.rs -> src/io/copy.rs
* move src/shutdown.rs -> src/io/shutdown.rs
* move src/write_all.rs -> src/io/write_all.rs
* move Async{Read,Write} => src/io/async_{read,write}.rs
* move Async{Read,Write} => src/async_{read,write}.rs
75 lines
2.2 KiB
Rust
75 lines
2.2 KiB
Rust
use std::io::{self, BufRead};
|
|
use std::mem;
|
|
|
|
use futures::{Poll, Future};
|
|
|
|
use AsyncRead;
|
|
|
|
/// A future which can be used to easily read the contents of a stream into a
|
|
/// vector until the delimiter is reached.
|
|
///
|
|
/// Created by the [`read_until`] function.
|
|
///
|
|
/// [`read_until`]: fn.read_until.html
|
|
#[derive(Debug)]
|
|
pub struct ReadUntil<A> {
|
|
state: State<A>,
|
|
}
|
|
|
|
#[derive(Debug)]
|
|
enum State<A> {
|
|
Reading {
|
|
a: A,
|
|
byte: u8,
|
|
buf: Vec<u8>,
|
|
},
|
|
Empty,
|
|
}
|
|
|
|
/// Creates a future which will read all the bytes associated with the I/O
|
|
/// object `A` into the buffer provided until the delimiter `byte` is reached.
|
|
/// This method is the async equivalent to [`BufRead::read_until`].
|
|
///
|
|
/// In case of an error the buffer and the object will be discarded, with
|
|
/// the error yielded. In the case of success the object will be destroyed and
|
|
/// the buffer will be returned, with all bytes up to, and including, the delimiter
|
|
/// (if found).
|
|
///
|
|
/// [`BufRead::read_until`]: https://doc.rust-lang.org/std/io/trait.BufRead.html#method.read_until
|
|
pub fn read_until<A>(a: A, byte: u8, buf: Vec<u8>) -> ReadUntil<A>
|
|
where A: AsyncRead + BufRead,
|
|
{
|
|
ReadUntil {
|
|
state: State::Reading {
|
|
a: a,
|
|
byte: byte,
|
|
buf: buf,
|
|
}
|
|
}
|
|
}
|
|
|
|
impl<A> Future for ReadUntil<A>
|
|
where A: AsyncRead + BufRead
|
|
{
|
|
type Item = (A, Vec<u8>);
|
|
type Error = io::Error;
|
|
|
|
fn poll(&mut self) -> Poll<(A, Vec<u8>), io::Error> {
|
|
match self.state {
|
|
State::Reading { ref mut a, byte, ref mut buf } => {
|
|
// If we get `Ok(n)`, then we know the stream hit EOF or the delimiter.
|
|
// and just return it, as we are finished.
|
|
// If we hit "would block" then all the read data so far
|
|
// is in our buffer, and otherwise we propagate errors.
|
|
try_nb!(a.read_until(byte, buf));
|
|
},
|
|
State::Empty => panic!("poll ReadUntil after it's done"),
|
|
}
|
|
|
|
match mem::replace(&mut self.state, State::Empty) {
|
|
State::Reading { a, byte: _, buf } => Ok((a, buf).into()),
|
|
State::Empty => unreachable!(),
|
|
}
|
|
}
|
|
}
|