extern crate mio;
extern crate tempdir;
extern crate mio_uds;
use std::io::{self, Write, Read};
use std::io::ErrorKind::WouldBlock;
use tempdir::TempDir;
use mio::*;
use mio_uds::*;
macro_rules! t {
($e:expr) => (match $e {
Ok(e) => e,
Err(e) => panic!("{} failed with {}", stringify!($e), e),
})
}
const SERVER: Token = Token(0);
const CLIENT: Token = Token(1);
struct EchoConn {
sock: UnixStream,
buf: Vec<u8>,
token: Option<Token>,
interest: Ready,
}
impl EchoConn {
fn new(sock: UnixStream) -> EchoConn {
EchoConn {
sock: sock,
buf: Vec::new(),
token: None,
interest: Ready::readable(),
}
}
fn writable(&mut self, poll: &Poll) -> io::Result<()> {
match self.sock.write(&self.buf) {
Ok(n) => {
assert_eq!(n, self.buf.len());
self.interest.insert(Ready::readable());
self.interest.remove(Ready::writable());
}
Err(ref e) if e.kind() == WouldBlock => {
self.interest.insert(Ready::writable());
}
Err(e) => panic!("not implemented; client err={:?}", e),
}
assert!(self.interest.is_readable() || self.interest.is_writable(),
"actual={:?}", self.interest);
poll.reregister(&self.sock, self.token.unwrap(), self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
fn readable(&mut self, poll: &Poll) -> io::Result<()> {
let mut buf = [0; 1024];
match self.sock.read(&mut buf) {
Ok(r) => {
self.buf = buf[..r].to_vec();
self.interest.remove(Ready::readable());
self.interest.insert(Ready::writable());
}
Err(ref e) if e.kind() == WouldBlock => {}
Err(_e) => {
self.interest.remove(Ready::readable());
}
}
assert!(self.interest.is_readable() || self.interest.is_writable(),
"actual={:?}", self.interest);
poll.reregister(&self.sock, self.token.unwrap(), self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
}
struct EchoServer {
sock: UnixListener,
conns: Vec<Option<EchoConn>>,
}
impl EchoServer {
fn accept(&mut self, poll: &Poll) -> io::Result<()> {
let sock = t!(self.sock.accept()).unwrap().0;
let conn = EchoConn::new(sock);
let tok = Token(self.conns.len() + 2);
self.conns.push(Some(conn));
self.conn(tok).token = Some(tok);
t!(poll.register(&self.conn(tok).sock, tok,
Ready::readable(),
PollOpt::edge() | PollOpt::oneshot()));
Ok(())
}
fn conn_readable(&mut self, poll: &Poll, tok: Token) -> io::Result<()> {
self.conn(tok).readable(poll)
}
fn conn_writable(&mut self, poll: &Poll, tok: Token) -> io::Result<()> {
self.conn(tok).writable(poll)
}
fn conn<'a>(&'a mut self, tok: Token) -> &'a mut EchoConn {
self.conns[usize::from(tok) - 2].as_mut().unwrap()
}
}
struct EchoClient {
sock: UnixStream,
msgs: Vec<&'static str>,
tx: &'static [u8],
rx: &'static [u8],
token: Token,
interest: Ready,
active: bool,
}
impl EchoClient {
fn new(sock: UnixStream, tok: Token, mut msgs: Vec<&'static str>) -> EchoClient {
let curr = msgs.remove(0);
EchoClient {
sock: sock,
msgs: msgs,
tx: curr.as_bytes(),
rx: curr.as_bytes(),
token: tok,
interest: Ready::empty(),
active: true,
}
}
fn readable(&mut self, poll: &Poll) -> io::Result<()> {
let mut buf = [0; 1024];
match self.sock.read(&mut buf) {
Ok(n) => {
assert_eq!(&self.rx[..n], &buf[..n]);
self.rx = &self.rx[n..];
self.interest.remove(Ready::readable());
if self.rx.len() == 0 {
self.next_msg(poll).unwrap();
}
}
Err(ref e) if e.kind() == WouldBlock => {}
Err(e) => panic!("error {}", e),
}
if !self.interest.is_empty() {
assert!(self.interest.is_readable() || self.interest.is_writable(),
"actual={:?}", self.interest);
try!(poll.reregister(&self.sock, self.token, self.interest,
PollOpt::edge() | PollOpt::oneshot()));
}
Ok(())
}
fn writable(&mut self, poll: &Poll) -> io::Result<()> {
match self.sock.write(self.tx) {
Ok(r) => {
self.tx = &self.tx[r..];
self.interest.insert(Ready::readable());
self.interest.remove(Ready::writable());
}
Err(ref e) if e.kind() == WouldBlock => {
self.interest.insert(Ready::writable());
}
Err(e) => panic!("not implemented; client err={:?}", e)
}
assert!(self.interest.is_readable() || self.interest.is_writable(),
"actual={:?}", self.interest);
poll.reregister(&self.sock, self.token, self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
fn next_msg(&mut self, poll: &Poll) -> io::Result<()> {
if self.msgs.is_empty() {
self.active = false;
return Ok(());
}
let curr = self.msgs.remove(0);
self.tx = curr.as_bytes();
self.rx = curr.as_bytes();
self.interest.insert(Ready::writable());
assert!(self.interest.is_readable() || self.interest.is_writable(),
"actual={:?}", self.interest);
poll.reregister(&self.sock, self.token, self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
}
struct Echo {
server: EchoServer,
client: EchoClient,
}
impl Echo {
fn new(srv: UnixListener, client: UnixStream, msgs: Vec<&'static str>) -> Echo {
Echo {
server: EchoServer {
sock: srv,
conns: Vec::new(),
},
client: EchoClient::new(client, CLIENT, msgs)
}
}
fn ready(&mut self,
poll: &Poll,
token: Token,
events: Ready) {
println!("ready {:?} {:?}", token, events);
if events.is_readable() {
match token {
SERVER => self.server.accept(poll).unwrap(),
CLIENT => self.client.readable(poll).unwrap(),
i => self.server.conn_readable(poll, i).unwrap()
}
}
if events.is_writable() {
match token {
SERVER => panic!("received writable for token 0"),
CLIENT => self.client.writable(poll).unwrap(),
_ => self.server.conn_writable(poll, token).unwrap()
}
}
}
}
#[test]
fn echo_server() {
let tmp_dir = t!(TempDir::new("mio-uds"));
let addr = tmp_dir.path().join("sock");
let poll = t!(Poll::new());
let mut events = Events::with_capacity(1024);
let srv = t!(UnixListener::bind(&addr));
t!(poll.register(&srv,
SERVER,
Ready::readable(),
PollOpt::edge() | PollOpt::oneshot()));
let sock = t!(UnixStream::connect(&addr));
t!(poll.register(&sock,
CLIENT,
Ready::writable(),
PollOpt::edge() | PollOpt::oneshot()));
let mut echo = Echo::new(srv, sock, vec!["foo", "bar"]);
while echo.client.active {
t!(poll.poll(&mut events, None));
for i in 0..events.len() {
let event = events.get(i).unwrap();
echo.ready(&poll, event.token(), event.readiness());
}
}
}