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
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
use std::fmt;
use std::io::{self, IoSlice, IoSliceMut, Read, Write};
use std::net::{self, Shutdown, SocketAddr};
#[cfg(unix)]
use std::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};
#[cfg(windows)]
use std::os::windows::io::{AsRawSocket, FromRawSocket, IntoRawSocket, RawSocket};

use crate::io_source::IoSource;
use crate::{event, sys, Interest, Registry, Token};

/// A non-blocking TCP stream between a local socket and a remote socket.
///
/// The socket will be closed when the value is dropped.
///
/// # Examples
///
/// ```
/// # use std::net::{TcpListener, SocketAddr};
/// # use std::error::Error;
/// #
/// # fn main() -> Result<(), Box<dyn Error>> {
/// let address: SocketAddr = "127.0.0.1:0".parse()?;
/// let listener = TcpListener::bind(address)?;
/// use mio::{Events, Interest, Poll, Token};
/// use mio::net::TcpStream;
/// use std::time::Duration;
///
/// let mut stream = TcpStream::connect(listener.local_addr()?)?;
///
/// let mut poll = Poll::new()?;
/// let mut events = Events::with_capacity(128);
///
/// // Register the socket with `Poll`
/// poll.registry().register(&mut stream, Token(0), Interest::WRITABLE)?;
///
/// poll.poll(&mut events, Some(Duration::from_millis(100)))?;
///
/// // The socket might be ready at this point
/// #     Ok(())
/// # }
/// ```
pub struct TcpStream {
    inner: IoSource<net::TcpStream>,
}

impl TcpStream {
    /// Create a new TCP stream and issue a non-blocking connect to the
    /// specified address.
    pub fn connect(addr: SocketAddr) -> io::Result<TcpStream> {
        sys::tcp::connect(addr).map(TcpStream::from_std)
    }

    /// Creates a new `TcpStream` from a standard `net::TcpStream`.
    ///
    /// This function is intended to be used to wrap a TCP stream from the
    /// standard library in the Mio equivalent. The conversion assumes nothing
    /// about the underlying stream; it is left up to the user to set it in
    /// non-blocking mode.
    ///
    /// # Note
    ///
    /// The TCP stream here will not have `connect` called on it, so it
    /// should already be connected via some other means (be it manually, or
    /// the standard library).
    pub fn from_std(stream: net::TcpStream) -> TcpStream {
        TcpStream {
            inner: IoSource::new(stream),
        }
    }

    /// Returns the socket address of the remote peer of this TCP connection.
    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
        self.inner.peer_addr()
    }

    /// Returns the socket address of the local half of this TCP connection.
    pub fn local_addr(&self) -> io::Result<SocketAddr> {
        self.inner.local_addr()
    }

    /// Shuts down the read, write, or both halves of this connection.
    ///
    /// This function will cause all pending and future I/O on the specified
    /// portions to return immediately with an appropriate value (see the
    /// documentation of `Shutdown`).
    pub fn shutdown(&self, how: Shutdown) -> io::Result<()> {
        self.inner.shutdown(how)
    }

    /// Sets the value of the `TCP_NODELAY` option on this socket.
    ///
    /// If set, this option disables the Nagle algorithm. This means that
    /// segments are always sent as soon as possible, even if there is only a
    /// small amount of data. When not set, data is buffered until there is a
    /// sufficient amount to send out, thereby avoiding the frequent sending of
    /// small packets.
    ///
    /// # Notes
    ///
    /// On Windows make sure the stream is connected before calling this method,
    /// by receiving an (writable) event. Trying to set `nodelay` on an
    /// unconnected `TcpStream` is undefined behavior.
    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
        self.inner.set_nodelay(nodelay)
    }

    /// Gets the value of the `TCP_NODELAY` option on this socket.
    ///
    /// For more information about this option, see [`set_nodelay`][link].
    ///
    /// [link]: #method.set_nodelay
    ///
    /// # Notes
    ///
    /// On Windows make sure the stream is connected before calling this method,
    /// by receiving an (writable) event. Trying to get `nodelay` on an
    /// unconnected `TcpStream` is undefined behavior.
    pub fn nodelay(&self) -> io::Result<bool> {
        self.inner.nodelay()
    }

    /// Sets the value for the `IP_TTL` option on this socket.
    ///
    /// This value sets the time-to-live field that is used in every packet sent
    /// from this socket.
    ///
    /// # Notes
    ///
    /// On Windows make sure the stream is connected before calling this method,
    /// by receiving an (writable) event. Trying to set `ttl` on an
    /// unconnected `TcpStream` is undefined behavior.
    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
        self.inner.set_ttl(ttl)
    }

    /// Gets the value of the `IP_TTL` option for this socket.
    ///
    /// For more information about this option, see [`set_ttl`][link].
    ///
    /// # Notes
    ///
    /// On Windows make sure the stream is connected before calling this method,
    /// by receiving an (writable) event. Trying to get `ttl` on an
    /// unconnected `TcpStream` is undefined behavior.
    ///
    /// [link]: #method.set_ttl
    pub fn ttl(&self) -> io::Result<u32> {
        self.inner.ttl()
    }

    /// Get the value of the `SO_ERROR` option on this socket.
    ///
    /// This will retrieve the stored error in the underlying socket, clearing
    /// the field in the process. This can be useful for checking errors between
    /// calls.
    pub fn take_error(&self) -> io::Result<Option<io::Error>> {
        self.inner.take_error()
    }

    /// Receives data on the socket from the remote address to which it is
    /// connected, without removing that data from the queue. On success,
    /// returns the number of bytes peeked.
    ///
    /// Successive calls return the same data. This is accomplished by passing
    /// `MSG_PEEK` as a flag to the underlying recv system call.
    pub fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
        self.inner.peek(buf)
    }
}

impl Read for TcpStream {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).read(buf))
    }

    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
    }
}

impl<'a> Read for &'a TcpStream {
    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).read(buf))
    }

    fn read_vectored(&mut self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).read_vectored(bufs))
    }
}

impl Write for TcpStream {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).write(buf))
    }

    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
    }

    fn flush(&mut self) -> io::Result<()> {
        self.inner.do_io(|inner| (&*inner).flush())
    }
}

impl<'a> Write for &'a TcpStream {
    fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).write(buf))
    }

    fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
        self.inner.do_io(|inner| (&*inner).write_vectored(bufs))
    }

    fn flush(&mut self) -> io::Result<()> {
        self.inner.do_io(|inner| (&*inner).flush())
    }
}

impl event::Source for TcpStream {
    fn register(
        &mut self,
        registry: &Registry,
        token: Token,
        interests: Interest,
    ) -> io::Result<()> {
        self.inner.register(registry, token, interests)
    }

    fn reregister(
        &mut self,
        registry: &Registry,
        token: Token,
        interests: Interest,
    ) -> io::Result<()> {
        self.inner.reregister(registry, token, interests)
    }

    fn deregister(&mut self, registry: &Registry) -> io::Result<()> {
        self.inner.deregister(registry)
    }
}

impl fmt::Debug for TcpStream {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.inner.fmt(f)
    }
}

#[cfg(unix)]
impl IntoRawFd for TcpStream {
    fn into_raw_fd(self) -> RawFd {
        self.inner.into_inner().into_raw_fd()
    }
}

#[cfg(unix)]
impl AsRawFd for TcpStream {
    fn as_raw_fd(&self) -> RawFd {
        self.inner.as_raw_fd()
    }
}

#[cfg(unix)]
impl FromRawFd for TcpStream {
    /// Converts a `RawFd` to a `TcpStream`.
    ///
    /// # Notes
    ///
    /// The caller is responsible for ensuring that the socket is in
    /// non-blocking mode.
    unsafe fn from_raw_fd(fd: RawFd) -> TcpStream {
        TcpStream::from_std(FromRawFd::from_raw_fd(fd))
    }
}

#[cfg(windows)]
impl IntoRawSocket for TcpStream {
    fn into_raw_socket(self) -> RawSocket {
        self.inner.into_inner().into_raw_socket()
    }
}

#[cfg(windows)]
impl AsRawSocket for TcpStream {
    fn as_raw_socket(&self) -> RawSocket {
        self.inner.as_raw_socket()
    }
}

#[cfg(windows)]
impl FromRawSocket for TcpStream {
    /// Converts a `RawSocket` to a `TcpStream`.
    ///
    /// # Notes
    ///
    /// The caller is responsible for ensuring that the socket is in
    /// non-blocking mode.
    unsafe fn from_raw_socket(socket: RawSocket) -> TcpStream {
        TcpStream::from_std(FromRawSocket::from_raw_socket(socket))
    }
}