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use {TryRead, TryWrite};
use mio::*;
use mio::deprecated::{EventLoop, Handler};
use mio::deprecated::unix::*;
use bytes::{Buf, ByteBuf, MutByteBuf, SliceBuf};
use slab::Slab;
use std::io;
use std::path::PathBuf;
use tempdir::TempDir;
const SERVER: Token = Token(10_000_000);
const CLIENT: Token = Token(10_000_001);
struct EchoConn {
sock: UnixStream,
buf: Option<ByteBuf>,
mut_buf: Option<MutByteBuf>,
token: Option<Token>,
interest: Ready
}
impl EchoConn {
fn new(sock: UnixStream) -> EchoConn {
EchoConn {
sock: sock,
buf: None,
mut_buf: Some(ByteBuf::mut_with_capacity(2048)),
token: None,
interest: Ready::hup()
}
}
fn writable(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
let mut buf = self.buf.take().unwrap();
match self.sock.try_write_buf(&mut buf) {
Ok(None) => {
debug!("client flushing buf; WOULDBLOCK");
self.buf = Some(buf);
self.interest.insert(Ready::writable());
}
Ok(Some(r)) => {
debug!("CONN : we wrote {} bytes!", r);
self.mut_buf = Some(buf.flip());
self.interest.insert(Ready::readable());
self.interest.remove(Ready::writable());
match self.sock.shutdown(Shutdown::Write) {
Err(e) => panic!(e),
_ => {},
}
}
Err(e) => debug!("not implemented; client err={:?}", e),
}
event_loop.reregister(&self.sock, self.token.unwrap(), self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
fn readable(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
let mut buf = self.mut_buf.take().unwrap();
match self.sock.try_read_buf(&mut buf) {
Ok(None) => {
debug!("CONN : spurious read wakeup");
self.mut_buf = Some(buf);
}
Ok(Some(r)) => {
debug!("CONN : we read {} bytes!", r);
// prepare to provide this to writable
self.buf = Some(buf.flip());
self.interest.remove(Ready::readable());
self.interest.insert(Ready::writable());
}
Err(e) => {
debug!("not implemented; client err={:?}", e);
self.interest.remove(Ready::readable());
}
};
event_loop.reregister(&self.sock, self.token.unwrap(), self.interest,
PollOpt::edge())
}
}
struct EchoServer {
sock: UnixListener,
conns: Slab<EchoConn>
}
impl EchoServer {
fn accept(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
debug!("server accepting socket");
let sock = self.sock.accept().unwrap();
let conn = EchoConn::new(sock,);
let tok = self.conns.insert(conn);
// Register the connection
self.conns[tok].token = Some(Token(tok));
event_loop.register(&self.conns[tok].sock, Token(tok), Ready::readable(),
PollOpt::edge() | PollOpt::oneshot())
.expect("could not register socket with event loop");
Ok(())
}
fn conn_readable(&mut self, event_loop: &mut EventLoop<Echo>,
tok: Token) -> io::Result<()> {
debug!("server conn readable; tok={:?}", tok);
self.conn(tok).readable(event_loop)
}
fn conn_writable(&mut self, event_loop: &mut EventLoop<Echo>,
tok: Token) -> io::Result<()> {
debug!("server conn writable; tok={:?}", tok);
self.conn(tok).writable(event_loop)
}
fn conn<'a>(&'a mut self, tok: Token) -> &'a mut EchoConn {
&mut self.conns[tok.into()]
}
}
struct EchoClient {
sock: UnixStream,
msgs: Vec<&'static str>,
tx: SliceBuf<'static>,
rx: SliceBuf<'static>,
mut_buf: Option<MutByteBuf>,
token: Token,
interest: Ready
}
// Sends a message and expects to receive the same exact message, one at a time
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: SliceBuf::wrap(curr.as_bytes()),
rx: SliceBuf::wrap(curr.as_bytes()),
mut_buf: Some(ByteBuf::mut_with_capacity(2048)),
token: tok,
interest: Ready::none()
}
}
fn readable(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
debug!("client socket readable");
let mut buf = self.mut_buf.take().unwrap();
match self.sock.try_read_buf(&mut buf) {
Ok(None) => {
debug!("CLIENT : spurious read wakeup");
self.mut_buf = Some(buf);
}
Ok(Some(r)) => {
if r == 0 {
self.interest.remove(Ready::readable());
event_loop.shutdown();
} else {
debug!("CLIENT : We read {} bytes!", r);
// prepare for reading
let mut buf = buf.flip();
while buf.has_remaining() {
let actual = buf.read_byte().unwrap();
let expect = self.rx.read_byte().unwrap();
assert!(actual == expect, "actual={}; expect={}", actual, expect);
}
self.mut_buf = Some(buf.flip());
if !self.rx.has_remaining() {
self.next_msg(event_loop).unwrap();
}
}
}
Err(e) => {
panic!("not implemented; client err={:?}", e);
}
};
event_loop.reregister(&self.sock, self.token, self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
fn writable(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
debug!("client socket writable");
match self.sock.try_write_buf(&mut self.tx) {
Ok(None) => {
debug!("client flushing buf; WOULDBLOCK");
self.interest.insert(Ready::writable());
}
Ok(Some(r)) => {
debug!("CLIENT : we wrote {} bytes!", r);
self.interest.insert(Ready::readable());
self.interest.remove(Ready::writable());
}
Err(e) => debug!("not implemented; client err={:?}", e)
}
event_loop.reregister(&self.sock, self.token, self.interest,
PollOpt::edge() | PollOpt::oneshot())
}
fn next_msg(&mut self, event_loop: &mut EventLoop<Echo>) -> io::Result<()> {
if self.msgs.is_empty() {
return Ok(());
}
let curr = self.msgs.remove(0);
debug!("client prepping next message");
self.tx = SliceBuf::wrap(curr.as_bytes());
self.rx = SliceBuf::wrap(curr.as_bytes());
self.interest.insert(Ready::writable());
event_loop.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: Slab::with_capacity(128)
},
client: EchoClient::new(client, CLIENT, msgs)
}
}
}
impl Handler for Echo {
type Timeout = usize;
type Message = ();
fn ready(&mut self, event_loop: &mut EventLoop<Echo>, token: Token,
events: Ready) {
debug!("ready {:?} {:?}", token, events);
if events.is_readable() {
match token {
SERVER => self.server.accept(event_loop).unwrap(),
CLIENT => self.client.readable(event_loop).unwrap(),
i => self.server.conn_readable(event_loop, i).unwrap()
}
}
if events.is_writable() {
match token {
SERVER => panic!("received writable for token 0"),
CLIENT => self.client.writable(event_loop).unwrap(),
_ => self.server.conn_writable(event_loop, token).unwrap()
};
}
}
}
#[test]
pub fn test_echo_server() {
debug!("Starting TEST_ECHO_SERVER");
let mut event_loop = EventLoop::new().unwrap();
let tmp_dir = TempDir::new("mio").unwrap();
let addr = tmp_dir.path().join(&PathBuf::from("sock"));
let srv = UnixListener::bind(&addr).unwrap();
event_loop.register(&srv, SERVER, Ready::readable(),
PollOpt::edge() | PollOpt::oneshot()).unwrap();
let sock = UnixStream::connect(&addr).unwrap();
// Connect to the server
event_loop.register(&sock, CLIENT, Ready::writable(),
PollOpt::edge() | PollOpt::oneshot()).unwrap();
// Start the event loop
event_loop.run(&mut Echo::new(srv, sock, vec!["foo", "bar"])).unwrap();
}
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