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use std;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr};
use std::io;
use futures::{Async, Future, Poll};
use futures::stream::{Fuse, Peekable, Stream};
use futures::task::park;
use rand::Rng;
use rand;
use tokio_core;
use tokio_core::channel::{channel, Sender, Receiver};
use tokio_core::reactor::{Handle};
pub type UdpClientStreamHandle = Sender<Vec<u8>>;
#[must_use = "futures do nothing unless polled"]
pub struct UdpClientStream {
name_server: SocketAddr,
socket: tokio_core::net::UdpSocket,
outbound_messages: Peekable<Fuse<Receiver<Vec<u8>>>>,
}
lazy_static!{
static ref IPV4_ZERO: Ipv4Addr = Ipv4Addr::new(0,0,0,0);
static ref IPV6_ZERO: Ipv6Addr = Ipv6Addr::new(0,0,0,0,0,0,0,0);
}
impl UdpClientStream {
pub fn new(name_server: SocketAddr, loop_handle: Handle) -> (Box<Future<Item=UdpClientStream, Error=io::Error>>, UdpClientStreamHandle) {
let (message_sender, outbound_messages) = channel(&loop_handle).expect("somethings wrong with the event loop");
let next_socket = Self::next_bound_local_address(&name_server);
let stream: Box<Future<Item=UdpClientStream, Error=io::Error>> = Box::new(next_socket
.map(move |socket| { tokio_core::net::UdpSocket::from_socket(socket, &loop_handle).expect("something wrong with the handle?") })
.map(move |socket| {
UdpClientStream {
name_server: name_server,
socket: socket,
outbound_messages: outbound_messages.fuse().peekable(),
}
}));
(stream, message_sender)
}
fn next_bound_local_address(name_server: &SocketAddr) -> NextRandomUdpSocket {
let zero_addr: IpAddr = match *name_server {
SocketAddr::V4(..) => IpAddr::V4(*IPV4_ZERO),
SocketAddr::V6(..) => IpAddr::V6(*IPV6_ZERO),
};
NextRandomUdpSocket{ bind_address: zero_addr }
}
}
impl Stream for UdpClientStream {
type Item = Vec<u8>;
type Error = io::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
loop {
match try!(self.outbound_messages.peek()) {
Async::Ready(Some(buffer)) => {
match self.socket.poll_write() {
Async::NotReady => {
return Ok(Async::NotReady)
},
Async::Ready(_) => {
try_nb!(self.socket.send_to(buffer, &self.name_server));
},
}
},
_ => (),
}
match try!(self.outbound_messages.poll()) {
Async::Ready(Some(_)) => (),
Async::NotReady | Async::Ready(None) => break,
}
}
let mut buf = [0u8; 2048];
let (len, src) = try_nb!(self.socket.recv_from(&mut buf));
if src != self.name_server {
debug!("{} does not match name_server: {}", src, self.name_server)
}
Ok(Async::Ready(Some(buf.iter().take(len).cloned().collect())))
}
}
#[must_use = "futures do nothing unless polled"]
struct NextRandomUdpSocket {
bind_address: IpAddr,
}
impl Future for NextRandomUdpSocket {
type Item = std::net::UdpSocket;
type Error = io::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let mut rand = rand::thread_rng();
for attempt in 0..10 {
let zero_addr = SocketAddr::new(self.bind_address, rand.gen_range(1025_u16, u16::max_value()));
match std::net::UdpSocket::bind(&zero_addr) {
Ok(socket) => {
return Ok(Async::Ready(socket))
},
Err(err) => debug!("unable to bind port, attempt: {}: {}", attempt, err),
}
}
warn!("could not get next random port, delaying");
park().unpark();
Ok(Async::NotReady)
}
}
#[test]
fn test_udp_client_stream_ipv4() {
udp_client_stream_test(IpAddr::V4(Ipv4Addr::new(127,0,0,1)))
}
#[test]
#[cfg(not(target_os = "linux"))]
fn test_udp_client_stream_ipv6() {
udp_client_stream_test(IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)))
}
#[cfg(test)]
fn udp_client_stream_test(server_addr: IpAddr) {
use tokio_core::reactor::Core;
use log::LogLevel;
use ::logger::TrustDnsLogger;
TrustDnsLogger::enable_logging(LogLevel::Debug);
use std;
let succeeded = std::sync::Arc::new(std::sync::atomic::AtomicBool::new(false));
let succeeded_clone = succeeded.clone();
std::thread::Builder::new().name("thread_killer".to_string()).spawn(move || {
let succeeded = succeeded_clone.clone();
for _ in 0..15 {
std::thread::sleep(std::time::Duration::from_secs(1));
if succeeded.load(std::sync::atomic::Ordering::Relaxed) { return }
}
panic!("timeout");
}).unwrap();
let server = std::net::UdpSocket::bind(SocketAddr::new(server_addr, 0)).unwrap();
server.set_read_timeout(Some(std::time::Duration::from_secs(5))).unwrap();
server.set_write_timeout(Some(std::time::Duration::from_secs(5))).unwrap();
let server_addr = server.local_addr().unwrap();
let test_bytes: &'static [u8; 8] = b"DEADBEEF";
let send_recv_times = 4;
let server_handle = std::thread::Builder::new().name("test_udp_client_stream_ipv4:server".to_string()).spawn(move || {
let mut buffer = [0_u8; 512];
for _ in 0..send_recv_times {
let (len, addr) = server.recv_from(&mut buffer).expect("receive failed");
assert_eq!(&buffer[0..len], test_bytes);
assert_eq!(server.send_to(&buffer[0..len], addr).expect("send failed"), len);
}
}).unwrap();
let mut io_loop = Core::new().unwrap();
let (stream, sender) = UdpClientStream::new(server_addr, io_loop.handle());
let mut stream: UdpClientStream = io_loop.run(stream).ok().unwrap();
for _ in 0..send_recv_times {
sender.send(test_bytes.to_vec()).unwrap();
let (buffer, stream_tmp) = io_loop.run(stream.into_future()).ok().unwrap();
stream = stream_tmp;
assert_eq!(&buffer.expect("no buffer received"), test_bytes);
}
succeeded.store(true, std::sync::atomic::Ordering::Relaxed);
server_handle.join().expect("server thread failed");
}