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registering.rs
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registering.rs
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#![cfg(not(target_os = "wasi"))]
#![cfg(all(feature = "os-poll", feature = "net"))]
use std::io::{self, Write};
use std::thread::sleep;
use std::time::Duration;
#[cfg(debug_assertions)]
use mio::net::UdpSocket;
use mio::net::{TcpListener, TcpStream};
use mio::{Events, Interest, Poll, Registry, Token};
mod util;
#[cfg(debug_assertions)]
use util::assert_error;
use util::{any_local_address, init};
const SERVER: Token = Token(0);
const CLIENT: Token = Token(1);
struct TestHandler {
server: TcpListener,
client: TcpStream,
state: usize,
}
impl TestHandler {
fn new(srv: TcpListener, cli: TcpStream) -> TestHandler {
TestHandler {
server: srv,
client: cli,
state: 0,
}
}
fn handle_read(&mut self, registry: &Registry, token: Token) {
match token {
SERVER => {
let mut sock = self.server.accept().unwrap().0;
if let Err(err) = sock.write(b"foobar") {
if err.kind() != io::ErrorKind::WouldBlock {
panic!("unexpected error writing to connection: {}", err);
}
}
}
CLIENT => {
assert!(self.state == 0, "unexpected state {}", self.state);
self.state = 1;
registry
.reregister(&mut self.client, CLIENT, Interest::WRITABLE)
.unwrap();
}
_ => panic!("unexpected token"),
}
}
fn handle_write(&mut self, registry: &Registry, token: Token) {
assert!(token == CLIENT, "unexpected token {:?}", token);
assert!(self.state == 1, "unexpected state {}", self.state);
self.state = 2;
registry.deregister(&mut self.client).unwrap();
registry.deregister(&mut self.server).unwrap();
}
}
#[test]
pub fn register_deregister() {
init();
let mut poll = Poll::new().unwrap();
let mut events = Events::with_capacity(1024);
let mut server = TcpListener::bind(any_local_address()).unwrap();
let addr = server.local_addr().unwrap();
poll.registry()
.register(&mut server, SERVER, Interest::READABLE)
.unwrap();
let mut client = TcpStream::connect(addr).unwrap();
// Register client socket only as writable
poll.registry()
.register(&mut client, CLIENT, Interest::READABLE)
.unwrap();
let mut handler = TestHandler::new(server, client);
loop {
poll.poll(&mut events, None).unwrap();
if let Some(event) = events.iter().next() {
if event.is_readable() {
handler.handle_read(poll.registry(), event.token());
}
if event.is_writable() {
handler.handle_write(poll.registry(), event.token());
break;
}
}
}
poll.poll(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert!(events.iter().next().is_none());
}
#[test]
pub fn reregister_different_interest_without_poll() {
init();
let mut events = Events::with_capacity(1024);
let mut poll = Poll::new().unwrap();
// Create the listener
let mut l = TcpListener::bind("127.0.0.1:0".parse().unwrap()).unwrap();
// Register the listener with `Poll`
poll.registry()
.register(&mut l, Token(0), Interest::READABLE)
.unwrap();
let mut s1 = TcpStream::connect(l.local_addr().unwrap()).unwrap();
poll.registry()
.register(&mut s1, Token(2), Interest::READABLE)
.unwrap();
const TIMEOUT: Duration = Duration::from_millis(200);
sleep(TIMEOUT);
poll.registry()
.reregister(&mut l, Token(0), Interest::WRITABLE)
.unwrap();
poll.poll(&mut events, Some(TIMEOUT)).unwrap();
assert!(events.iter().next().is_none());
}
#[test]
#[cfg(debug_assertions)] // Check is only present when debug assertions are enabled.
fn tcp_register_multiple_event_loops() {
init();
let mut listener = TcpListener::bind(any_local_address()).unwrap();
let addr = listener.local_addr().unwrap();
let poll1 = Poll::new().unwrap();
poll1
.registry()
.register(
&mut listener,
Token(0),
Interest::READABLE | Interest::WRITABLE,
)
.unwrap();
let poll2 = Poll::new().unwrap();
// Try registering the same socket with the initial one
let res = poll2.registry().register(
&mut listener,
Token(0),
Interest::READABLE | Interest::WRITABLE,
);
assert_error(res, "I/O source already registered with a `Registry`");
// Try the stream
let mut stream = TcpStream::connect(addr).unwrap();
poll1
.registry()
.register(
&mut stream,
Token(1),
Interest::READABLE | Interest::WRITABLE,
)
.unwrap();
let res = poll2.registry().register(
&mut stream,
Token(1),
Interest::READABLE | Interest::WRITABLE,
);
assert_error(res, "I/O source already registered with a `Registry`");
}
#[test]
#[cfg(debug_assertions)] // Check is only present when debug assertions are enabled.
fn udp_register_multiple_event_loops() {
init();
let mut socket = UdpSocket::bind(any_local_address()).unwrap();
let poll1 = Poll::new().unwrap();
poll1
.registry()
.register(
&mut socket,
Token(0),
Interest::READABLE | Interest::WRITABLE,
)
.unwrap();
let poll2 = Poll::new().unwrap();
// Try registering the same socket with the initial one
let res = poll2.registry().register(
&mut socket,
Token(0),
Interest::READABLE | Interest::WRITABLE,
);
assert_error(res, "I/O source already registered with a `Registry`");
}
#[test]
fn registering_after_deregistering() {
init();
let mut poll = Poll::new().unwrap();
let mut events = Events::with_capacity(8);
let mut server = TcpListener::bind(any_local_address()).unwrap();
poll.registry()
.register(&mut server, SERVER, Interest::READABLE)
.unwrap();
poll.registry().deregister(&mut server).unwrap();
poll.registry()
.register(&mut server, SERVER, Interest::READABLE)
.unwrap();
poll.poll(&mut events, Some(Duration::from_millis(100)))
.unwrap();
assert!(events.is_empty());
}