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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::cell::RefCell;
use std::fmt;
use std::io;
use std::net::{ToSocketAddrs, UdpSocket};
use IntoInner;
use socket::Socket;
use sys::c;
/// An "in progress" UDP socket which has not yet been connected.
///
/// Allows configuration of a socket before the socket is connected.
pub struct UdpBuilder {
socket: RefCell<Option<Socket>>,
}
impl UdpBuilder {
/// Constructs a new UdpBuilder with the `AF_INET` domain, the `SOCK_DGRAM`
/// 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<UdpBuilder> {
Socket::new(c::AF_INET, c::SOCK_DGRAM).map(::FromInner::from_inner)
}
/// Constructs a new UdpBuilder with the `AF_INET6` domain, the `SOCK_DGRAM`
/// 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<UdpBuilder> {
Socket::new(c::AF_INET6, c::SOCK_DGRAM).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<UdpSocket>
where T: ToSocketAddrs
{
try!(self.with_socket(|sock| {
let addr = try!(::one_addr(addr));
sock.bind(&addr)
}));
Ok(self.socket.borrow_mut().take().unwrap().into_inner().into_udp_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 UdpBuilder {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "UdpBuilder {{ socket: {:?} }}",
self.socket.borrow().as_ref().unwrap())
}
}
impl ::AsInner for UdpBuilder {
type Inner = RefCell<Option<Socket>>;
fn as_inner(&self) -> &RefCell<Option<Socket>> { &self.socket }
}
impl ::FromInner for UdpBuilder {
type Inner = Socket;
fn from_inner(sock: Socket) -> UdpBuilder {
UdpBuilder { socket: RefCell::new(Some(sock)) }
}
}