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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use std::convert::From;
use std::io;
use std::io::{ErrorKind, Read, Write};
use std::net::{Shutdown, TcpStream, ToSocketAddrs};
#[cfg(unix)]
use std::os::unix::net::UnixStream;
use super::{ReadHalf, TIoChannel, WriteHalf};
use crate::{new_transport_error, TransportErrorKind};
/// Bidirectional TCP/IP channel.
///
/// # Examples
///
/// Create a `TTcpChannel`.
///
/// ```no_run
/// use std::io::{Read, Write};
/// use thrift::transport::TTcpChannel;
///
/// let mut c = TTcpChannel::new();
/// c.open("localhost:9090").unwrap();
///
/// let mut buf = vec![0u8; 4];
/// c.read(&mut buf).unwrap();
/// c.write(&vec![0, 1, 2]).unwrap();
/// ```
///
/// Create a `TTcpChannel` by wrapping an existing `TcpStream`.
///
/// ```no_run
/// use std::io::{Read, Write};
/// use std::net::TcpStream;
/// use thrift::transport::TTcpChannel;
///
/// let stream = TcpStream::connect("127.0.0.1:9189").unwrap();
///
/// // no need to call c.open() since we've already connected above
/// let mut c = TTcpChannel::with_stream(stream);
///
/// let mut buf = vec![0u8; 4];
/// c.read(&mut buf).unwrap();
/// c.write(&vec![0, 1, 2]).unwrap();
/// ```
#[derive(Debug, Default)]
pub struct TTcpChannel {
stream: Option<TcpStream>,
}
impl TTcpChannel {
/// Create an uninitialized `TTcpChannel`.
///
/// The returned instance must be opened using `TTcpChannel::open(...)`
/// before it can be used.
pub fn new() -> TTcpChannel {
TTcpChannel { stream: None }
}
/// Create a `TTcpChannel` that wraps an existing `TcpStream`.
///
/// The passed-in stream is assumed to have been opened before being wrapped
/// by the created `TTcpChannel` instance.
pub fn with_stream(stream: TcpStream) -> TTcpChannel {
TTcpChannel {
stream: Some(stream),
}
}
/// Connect to `remote_address`, which should implement `ToSocketAddrs` trait.
pub fn open<A: ToSocketAddrs>(&mut self, remote_address: A) -> crate::Result<()> {
if self.stream.is_some() {
Err(new_transport_error(
TransportErrorKind::AlreadyOpen,
"tcp connection previously opened",
))
} else {
match TcpStream::connect(&remote_address) {
Ok(s) => {
self.stream = Some(s);
Ok(())
}
Err(e) => Err(From::from(e)),
}
}
}
/// Shut down this channel.
///
/// Both send and receive halves are closed, and this instance can no
/// longer be used to communicate with another endpoint.
pub fn close(&mut self) -> crate::Result<()> {
self.if_set(|s| s.shutdown(Shutdown::Both))
.map_err(From::from)
}
fn if_set<F, T>(&mut self, mut stream_operation: F) -> io::Result<T>
where
F: FnMut(&mut TcpStream) -> io::Result<T>,
{
if let Some(ref mut s) = self.stream {
stream_operation(s)
} else {
Err(io::Error::new(
ErrorKind::NotConnected,
"tcp endpoint not connected",
))
}
}
}
impl TIoChannel for TTcpChannel {
fn split(self) -> crate::Result<(ReadHalf<Self>, WriteHalf<Self>)>
where
Self: Sized,
{
let mut s = self;
s.stream
.as_mut()
.and_then(|s| s.try_clone().ok())
.map(|cloned| {
let read_half = ReadHalf::new(TTcpChannel {
stream: s.stream.take(),
});
let write_half = WriteHalf::new(TTcpChannel {
stream: Some(cloned),
});
(read_half, write_half)
})
.ok_or_else(|| {
new_transport_error(
TransportErrorKind::Unknown,
"cannot clone underlying tcp stream",
)
})
}
}
impl Read for TTcpChannel {
fn read(&mut self, b: &mut [u8]) -> io::Result<usize> {
self.if_set(|s| s.read(b))
}
}
impl Write for TTcpChannel {
fn write(&mut self, b: &[u8]) -> io::Result<usize> {
self.if_set(|s| s.write(b))
}
fn flush(&mut self) -> io::Result<()> {
self.if_set(|s| s.flush())
}
}
#[cfg(unix)]
impl TIoChannel for UnixStream {
fn split(self) -> crate::Result<(ReadHalf<Self>, WriteHalf<Self>)>
where
Self: Sized,
{
let socket_rx = self.try_clone().unwrap();
Ok((ReadHalf::new(self), WriteHalf::new(socket_rx)))
}
}
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