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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::cell::RefCell;
use std::io;
use std::net::{SocketAddr, ToSocketAddrs, TcpListener, TcpStream};
use std::fmt;
use IntoInner;
use socket::Socket;
use sys::c;
/// An "in progress" TCP socket which has not yet been connected or listened.
///
/// Allows configuration of a socket before one of these operations is executed.
pub struct TcpBuilder {
socket: RefCell<Option<Socket>>,
}
impl TcpBuilder {
/// Constructs a new TcpBuilder with the `AF_INET` domain, the `SOCK_STREAM`
/// type, and with a protocol argument of 0.
///
/// Note that passing other kinds of flags or arguments can be done through
/// the `FromRaw{Fd,Socket}` implementation.
pub fn new_v4() -> io::Result<TcpBuilder> {
Socket::new(c::AF_INET, c::SOCK_STREAM).map(::FromInner::from_inner)
}
/// Constructs a new TcpBuilder with the `AF_INET6` domain, the `SOCK_STREAM`
/// type, and with a protocol argument of 0.
///
/// Note that passing other kinds of flags or arguments can be done through
/// the `FromRaw{Fd,Socket}` implementation.
pub fn new_v6() -> io::Result<TcpBuilder> {
Socket::new(c::AF_INET6, c::SOCK_STREAM).map(::FromInner::from_inner)
}
/// Binds this socket to the specified address.
///
/// This function directly corresponds to the bind(2) function on Windows
/// and Unix.
pub fn bind<T>(&self, addr: T) -> io::Result<&TcpBuilder>
where T: ToSocketAddrs
{
self.with_socket(|sock| {
let addr = try!(::one_addr(addr));
sock.bind(&addr)
}).map(|()| self)
}
/// Mark a socket as ready to accept incoming connection requests using
/// accept()
///
/// This function directly corresponds to the listen(2) function on Windows
/// and Unix.
///
/// An error will be returned if `listen` or `connect` has already been
/// called on this builder.
pub fn listen(&self, backlog: i32) -> io::Result<TcpListener> {
self.with_socket(|sock| {
sock.listen(backlog)
}).and_then(|()| {
self.to_tcp_listener()
})
}
/// Initiate a connection on this socket to the specified address.
///
/// This function directly corresponds to the connect(2) function on Windows
/// and Unix.
///
/// An error will be returned if `listen` or `connect` has already been
/// called on this builder.
pub fn connect<T>(&self, addr: T) -> io::Result<TcpStream>
where T: ToSocketAddrs
{
self.with_socket(|sock| {
let err = io::Error::new(io::ErrorKind::Other,
"no socket addresses resolved");
try!(addr.to_socket_addrs()).fold(Err(err), |prev, addr| {
prev.or_else(|_| sock.connect(&addr))
})
}).and_then(|()| {
self.to_tcp_stream()
})
}
/// Converts this builder into a `TcpStream`
///
/// This function will consume the internal socket and return it re-wrapped
/// as a `TcpStream`. An error will be returned if the internal socket has
/// already been consumed from a successful call to `connect`, `listen`,
/// etc.
pub fn to_tcp_stream(&self) -> io::Result<TcpStream> {
self.socket.borrow_mut().take().map(|s| s.into_inner().into_tcp_stream())
.ok_or(io::Error::new(io::ErrorKind::Other,
"socket has already been consumed"))
}
/// Converts this builder into a `TcpListener`
///
/// This function will consume the internal socket and return it re-wrapped
/// as a `TcpListener`. An error will be returned if the internal socket has
/// already been consumed from a successful call to `connect`, `listen`,
/// etc.
pub fn to_tcp_listener(&self) -> io::Result<TcpListener> {
self.socket.borrow_mut().take()
.map(|s| s.into_inner().into_tcp_listener())
.ok_or(io::Error::new(io::ErrorKind::Other,
"socket has already been consumed"))
}
/// Returns the address of the local half of this TCP socket.
///
/// An error will be returned if `listen` or `connect` has already been
/// called on this builder.
pub fn local_addr(&self) -> io::Result<SocketAddr> {
match *self.socket.borrow() {
Some(ref s) => s.getsockname(),
None => Err(io::Error::new(io::ErrorKind::Other,
"builder has already finished its socket")),
}
}
fn with_socket<F>(&self, f: F) -> io::Result<()>
where F: FnOnce(&Socket) -> io::Result<()>
{
match *self.socket.borrow() {
Some(ref s) => f(s),
None => Err(io::Error::new(io::ErrorKind::Other,
"builder has already finished its socket")),
}
}
}
impl fmt::Debug for TcpBuilder {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "TcpBuilder {{ socket: {:?} }}",
self.socket.borrow().as_ref().unwrap())
}
}
impl ::AsInner for TcpBuilder {
type Inner = RefCell<Option<Socket>>;
fn as_inner(&self) -> &RefCell<Option<Socket>> { &self.socket }
}
impl ::FromInner for TcpBuilder {
type Inner = Socket;
fn from_inner(sock: Socket) -> TcpBuilder {
TcpBuilder { socket: RefCell::new(Some(sock)) }
}
}
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