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
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
use std::io::{IoSlice, IoSliceMut, Read as _, Write as _};
use std::net::SocketAddr;
use std::pin::Pin;

use crate::future;
use crate::io::{self, Read, Write};
use crate::net::driver::Watcher;
use crate::net::ToSocketAddrs;
use crate::task::{spawn_blocking, Context, Poll};

/// A TCP stream between a local and a remote socket.
///
/// A `TcpStream` can either be created by connecting to an endpoint, via the [`connect`] method,
/// or by [accepting] a connection from a [listener].  It can be read or written to using the
/// [`AsyncRead`], [`AsyncWrite`], and related extension traits in [`futures::io`].
///
/// The connection will be closed when the value is dropped. The reading and writing portions of
/// the connection can also be shut down individually with the [`shutdown`] method.
///
/// This type is an async version of [`std::net::TcpStream`].
///
/// [`connect`]: struct.TcpStream.html#method.connect
/// [accepting]: struct.TcpListener.html#method.accept
/// [listener]: struct.TcpListener.html
/// [`AsyncRead`]: https://docs.rs/futures-preview/0.3.0-alpha.17/futures/io/trait.AsyncRead.html
/// [`AsyncWrite`]: https://docs.rs/futures-preview/0.3.0-alpha.17/futures/io/trait.AsyncWrite.html
/// [`futures::io`]: https://docs.rs/futures-preview/0.3.0-alpha.17/futures/io/index.html
/// [`shutdown`]: struct.TcpStream.html#method.shutdown
/// [`std::net::TcpStream`]: https://doc.rust-lang.org/std/net/struct.TcpStream.html
///
/// ## Examples
///
/// ```no_run
/// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
/// #
/// use async_std::net::TcpStream;
/// use async_std::prelude::*;
///
/// let mut stream = TcpStream::connect("127.0.0.1:8080").await?;
/// stream.write_all(b"hello world").await?;
///
/// let mut buf = vec![0u8; 1024];
/// let n = stream.read(&mut buf).await?;
/// #
/// # Ok(()) }) }
/// ```
#[derive(Debug)]
pub struct TcpStream {
    pub(super) watcher: Watcher<mio::net::TcpStream>,
}

impl TcpStream {
    /// Creates a new TCP stream connected to the specified address.
    ///
    /// This method will create a new TCP socket and attempt to connect it to the `addr`
    /// provided. The [returned future] will be resolved once the stream has successfully
    /// connected, or it will return an error if one occurs.
    ///
    /// [returned future]: struct.Connect.html
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:0").await?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub async fn connect<A: ToSocketAddrs>(addrs: A) -> io::Result<TcpStream> {
        let mut last_err = None;

        for addr in addrs.to_socket_addrs().await? {
            let res = spawn_blocking(move || {
                let std_stream = std::net::TcpStream::connect(addr)?;
                let mio_stream = mio::net::TcpStream::from_stream(std_stream)?;
                Ok(TcpStream {
                    watcher: Watcher::new(mio_stream),
                })
            })
            .await;

            match res {
                Ok(stream) => return Ok(stream),
                Err(err) => last_err = Some(err),
            }
        }

        Err(last_err.unwrap_or_else(|| {
            io::Error::new(
                io::ErrorKind::InvalidInput,
                "could not resolve to any addresses",
            )
        }))
    }

    /// Returns the local address that this stream is connected to.
    ///
    /// ## Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    /// let addr = stream.local_addr()?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn local_addr(&self) -> io::Result<SocketAddr> {
        self.watcher.get_ref().local_addr()
    }

    /// Returns the remote address that this stream is connected to.
    ///
    /// ## Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    /// let peer = stream.peer_addr()?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn peer_addr(&self) -> io::Result<SocketAddr> {
        self.watcher.get_ref().peer_addr()
    }

    /// Gets the value of the `IP_TTL` option for this socket.
    ///
    /// For more information about this option, see [`set_ttl`].
    ///
    /// [`set_ttl`]: #method.set_ttl
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    ///
    /// stream.set_ttl(100)?;
    /// assert_eq!(stream.ttl()?, 100);
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn ttl(&self) -> io::Result<u32> {
        self.watcher.get_ref().ttl()
    }

    /// 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.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    ///
    /// stream.set_ttl(100)?;
    /// assert_eq!(stream.ttl()?, 100);
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn set_ttl(&self, ttl: u32) -> io::Result<()> {
        self.watcher.get_ref().set_ttl(ttl)
    }

    /// 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.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8000").await?;
    ///
    /// let mut buf = vec![0; 1024];
    /// let n = stream.peek(&mut buf).await?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub async fn peek(&self, buf: &mut [u8]) -> io::Result<usize> {
        future::poll_fn(|cx| self.watcher.poll_read_with(cx, |inner| inner.peek(buf))).await
    }

    /// Gets the value of the `TCP_NODELAY` option on this socket.
    ///
    /// For more information about this option, see [`set_nodelay`].
    ///
    /// [`set_nodelay`]: #method.set_nodelay
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    ///
    /// stream.set_nodelay(true)?;
    /// assert_eq!(stream.nodelay()?, true);
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn nodelay(&self) -> io::Result<bool> {
        self.watcher.get_ref().nodelay()
    }

    /// 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.
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    ///
    /// stream.set_nodelay(true)?;
    /// assert_eq!(stream.nodelay()?, true);
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn set_nodelay(&self, nodelay: bool) -> io::Result<()> {
        self.watcher.get_ref().set_nodelay(nodelay)
    }

    /// Shuts down the read, write, or both halves of this connection.
    ///
    /// This method will cause all pending and future I/O on the specified portions to return
    /// immediately with an appropriate value (see the documentation of [`Shutdown`]).
    ///
    /// [`Shutdown`]: https://doc.rust-lang.org/std/net/enum.Shutdown.html
    ///
    /// # Examples
    ///
    /// ```no_run
    /// # fn main() -> std::io::Result<()> { async_std::task::block_on(async {
    /// #
    /// use std::net::Shutdown;
    ///
    /// use async_std::net::TcpStream;
    ///
    /// let stream = TcpStream::connect("127.0.0.1:8080").await?;
    /// stream.shutdown(Shutdown::Both)?;
    /// #
    /// # Ok(()) }) }
    /// ```
    pub fn shutdown(&self, how: std::net::Shutdown) -> std::io::Result<()> {
        self.watcher.get_ref().shutdown(how)
    }
}

impl Read for TcpStream {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<io::Result<usize>> {
        Pin::new(&mut &*self).poll_read(cx, buf)
    }

    fn poll_read_vectored(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &mut [IoSliceMut<'_>],
    ) -> Poll<io::Result<usize>> {
        Pin::new(&mut &*self).poll_read_vectored(cx, bufs)
    }
}

impl Read for &TcpStream {
    fn poll_read(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &mut [u8],
    ) -> Poll<io::Result<usize>> {
        self.watcher.poll_read_with(cx, |mut inner| inner.read(buf))
    }
}

impl Write for TcpStream {
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        Pin::new(&mut &*self).poll_write(cx, buf)
    }

    fn poll_write_vectored(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        bufs: &[IoSlice<'_>],
    ) -> Poll<io::Result<usize>> {
        Pin::new(&mut &*self).poll_write_vectored(cx, bufs)
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(&mut &*self).poll_flush(cx)
    }

    fn poll_close(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        Pin::new(&mut &*self).poll_close(cx)
    }
}

impl Write for &TcpStream {
    fn poll_write(
        self: Pin<&mut Self>,
        cx: &mut Context<'_>,
        buf: &[u8],
    ) -> Poll<io::Result<usize>> {
        self.watcher
            .poll_write_with(cx, |mut inner| inner.write(buf))
    }

    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
        self.watcher.poll_write_with(cx, |mut inner| inner.flush())
    }

    fn poll_close(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<io::Result<()>> {
        Poll::Ready(Ok(()))
    }
}

impl From<std::net::TcpStream> for TcpStream {
    /// Converts a `std::net::TcpStream` into its asynchronous equivalent.
    fn from(stream: std::net::TcpStream) -> TcpStream {
        let mio_stream = mio::net::TcpStream::from_stream(stream).unwrap();
        TcpStream {
            watcher: Watcher::new(mio_stream),
        }
    }
}

cfg_unix! {
    use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd, RawFd};

    impl AsRawFd for TcpStream {
        fn as_raw_fd(&self) -> RawFd {
            self.watcher.get_ref().as_raw_fd()
        }
    }

    impl FromRawFd for TcpStream {
        unsafe fn from_raw_fd(fd: RawFd) -> TcpStream {
            std::net::TcpStream::from_raw_fd(fd).into()
        }
    }

    impl IntoRawFd for TcpStream {
        fn into_raw_fd(self) -> RawFd {
            self.watcher.into_inner().into_raw_fd()
        }
    }
}

cfg_windows! {
    // use crate::os::windows::io::{AsRawHandle, FromRawHandle, IntoRawHandle, RawHandle};
    //
    // impl AsRawSocket for TcpStream {
    //     fn as_raw_socket(&self) -> RawSocket {
    //         self.raw_socket
    //     }
    // }
    //
    // impl FromRawSocket for TcpStream {
    //     unsafe fn from_raw_socket(handle: RawSocket) -> TcpStream {
    //         net::TcpStream::from_raw_socket(handle).try_into().unwrap()
    //     }
    // }
    //
    // impl IntoRawSocket for TcpListener {
    //     fn into_raw_socket(self) -> RawSocket {
    //         self.raw_socket
    //     }
    // }
}