1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93

use futures::{Async, Poll};
use std::{fmt, io};
use {AsyncRead, AsyncWrite};

/// A simple wrapper type which allows types that only implement
/// `std::io::Read` or `std::io::Write` to be used in contexts which expect
/// an `AsyncRead` or `AsyncWrite`.
///
/// If these types issue an error with the kind `io::ErrorKind::WouldBlock`,
/// it is expected that they will notify the current task on readiness.
/// Synchronous `std` types should not issue errors of this kind and
/// are safe to use in this context. However, using these types with
/// `AllowStdIo` will cause the event loop to block, so they should be used
/// with care.
#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct AllowStdIo<T>(T);

impl<T> AllowStdIo<T> {
    /// Creates a new `AllowStdIo` from an existing IO object.
    pub fn new(io: T) -> Self {
        AllowStdIo(io)
    }

    /// Returns a reference to the contained IO object.
    pub fn get_ref(&self) -> &T {
        &self.0
    }

    /// Returns a mutable reference to the contained IO object.
    pub fn get_mut(&mut self) -> &mut T {
        &mut self.0
    }

    /// Consumes self and returns the contained IO object.
    pub fn into_inner(self) -> T {
        self.0
    }
}

impl<T> io::Write for AllowStdIo<T>
where
    T: io::Write,
{
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.0.write(buf)
    }
    fn flush(&mut self) -> io::Result<()> {
        self.0.flush()
    }
    fn write_all(&mut self, buf: &[u8]) -> io::Result<()> {
        self.0.write_all(buf)
    }
    fn write_fmt(&mut self, fmt: fmt::Arguments) -> io::Result<()> {
        self.0.write_fmt(fmt)
    }
}

impl<T> AsyncWrite for AllowStdIo<T>
where
    T: io::Write,
{
    fn shutdown(&mut self) -> Poll<(), io::Error> {
        Ok(Async::Ready(()))
    }
}

impl<T> io::Read for AllowStdIo<T>
where
    T: io::Read,
{
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        self.0.read(buf)
    }
    // TODO: implement the `initializer` fn when it stabilizes.
    // See rust-lang/rust #42788
    fn read_to_end(&mut self, buf: &mut Vec<u8>) -> io::Result<usize> {
        self.0.read_to_end(buf)
    }
    fn read_to_string(&mut self, buf: &mut String) -> io::Result<usize> {
        self.0.read_to_string(buf)
    }
    fn read_exact(&mut self, buf: &mut [u8]) -> io::Result<()> {
        self.0.read_exact(buf)
    }
}

impl<T> AsyncRead for AllowStdIo<T>
where
    T: io::Read,
{
    // TODO: override prepare_uninitialized_buffer once `Read::initializer` is stable.
    // See rust-lang/rust #42788
}