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use futures::future::ok;
use std::rc::Rc;
use super::{BoxedNewPeerFuture, Peer};
use super::{ConstructParams, PeerConstructor, Specifier};
use std::cell::RefCell;
use std::io::{Error as IoError, Read, Write};
use tokio_io::{AsyncRead, AsyncWrite};
use super::{once, simple_err, wouldblock};
use futures::{Async, Future, Poll};
#[derive(Debug)]
pub struct Foreachmsg(pub Rc<dyn Specifier>);
impl Specifier for Foreachmsg {
fn construct(&self, cp: ConstructParams) -> PeerConstructor {
once(foreachmsg_peer(self.0.clone(), cp))
}
specifier_boilerplate!(singleconnect noglobalstate has_subspec);
self_0_is_subspecifier!(...);
}
specifier_class!(
name = ForeachmsgClass,
target = Foreachmsg,
prefixes = ["foreachmsg:"],
arg_handling = subspec,
overlay = true,
MessageBoundaryStatusDependsOnInnerType,
SingleConnect,
help = r#"
Execute something for each incoming message.
Somewhat the reverse of the `autoreconnect:`.
Example:
websocat -t -u ws://server/listen_for_updates foreachmsg:writefile:status.txt
This keeps only recent incoming message in file and discards earlier messages.
"#
);
#[derive(Default)]
struct State2 {
already_warned: bool,
}
#[derive(Clone)]
enum Phase {
Idle,
WriteDebt(Vec<u8>),
Flushing,
Closing,
WaitingForReadToFinish,
}
struct State {
s: Rc<dyn Specifier>,
p: Option<Peer>,
n: Option<BoxedNewPeerFuture>,
cp: ConstructParams,
aux: State2,
ph: Phase,
finished_reading: bool,
read_waiter_tx: Option<futures::sync::oneshot::Sender<()>>,
read_waiter_rx: Option<futures::sync::oneshot::Receiver<()>>,
wait_for_new_peer_tx: Option<futures::sync::oneshot::Sender<()>>,
wait_for_new_peer_rx: Option<futures::sync::oneshot::Receiver<()>>,
need_wait_for_reading: bool,
}
/// This implementation's poll is to be reused many times, both after returning item and error
impl State {
//type Item = &'mut Peer;
//type Error = Box<::std::error::Error>;
fn poll(&mut self) -> Poll<&mut Peer, Box<dyn (::std::error::Error)>> {
let pp = &mut self.p;
let nn = &mut self.n;
let aux = &mut self.aux;
loop {
let cp = self.cp.clone();
if let Some(ref mut p) = *pp {
return Ok(Async::Ready(p));
}
// Peer is not present: trying to create a new one
if let Some(mut bnpf) = nn.take() {
match bnpf.poll() {
Ok(Async::Ready(p)) => {
*pp = Some(p);
if let Some(tx) = self.wait_for_new_peer_tx.take() {
let _ = tx.send(());
}
continue;
}
Ok(Async::NotReady) => {
*nn = Some(bnpf);
return Ok(Async::NotReady);
}
Err(_x) => {
// Stop on error:
//return Err(_x);
// Just reconnect again on error
if !aux.already_warned {
aux.already_warned = true;
error!("Reconnecting failed. Trying again in tight endless loop.");
}
}
}
}
let l2r = cp.left_to_right.clone();
let pc: PeerConstructor = self.s.construct(cp);
*nn = Some(pc.get_only_first_conn(l2r));
self.finished_reading = false;
self.ph = Phase::Idle;
self.read_waiter_tx = None;
self.read_waiter_rx = None;
}
}
}
#[derive(Clone)]
struct PeerHandle(Rc<RefCell<State>>);
macro_rules! getpeer {
($state:ident -> $p:ident) => {
let $p: &mut Peer = match $state.poll() {
Ok(Async::Ready(p)) => p,
Ok(Async::NotReady) => return wouldblock(),
Err(e) => {
return Err(simple_err(format!("{}", e)));
}
};
};
}
impl State {
fn reconnect(&mut self) {
info!("Reconnect");
self.p = None;
self.ph = Phase::Idle;
self.finished_reading = false;
self.read_waiter_tx = None;
self.read_waiter_rx = None;
}
}
impl Read for PeerHandle {
fn read(&mut self, b: &mut [u8]) -> Result<usize, IoError> {
let mut state = self.0.borrow_mut();
loop {
if let Some(w) = state.wait_for_new_peer_rx.as_mut() {
match w.poll() {
Ok(Async::NotReady) => return wouldblock(),
_ => {
state.wait_for_new_peer_rx = None;
}
}
}
let p : &mut Peer = match state.poll() {
Ok(Async::Ready(p)) => p,
Ok(Async::NotReady) => return wouldblock(),
Err(e) => {
return Err(simple_err(format!("{}", e)));
}
};
#[allow(unused_assignments)]
let mut finished_but_loop_around = false;
match p.0.read(b) {
Ok(0) => {
state.finished_reading = true;
if state.need_wait_for_reading {
finished_but_loop_around = true;
} else {
return Ok(0);
}
}
Err(e) => {
if e.kind() == ::std::io::ErrorKind::WouldBlock {
return Err(e);
}
state.finished_reading = true;
warn!("{}", e);
if state.need_wait_for_reading {
// Get a new peer to read from
finished_but_loop_around = true;
} else {
return Err(e);
}
}
Ok(x) => {
return Ok(x);
}
}
if finished_but_loop_around {
state.finished_reading = true;
let (tx,rx) = futures::sync::oneshot::channel();
state.wait_for_new_peer_tx = Some(tx);
state.wait_for_new_peer_rx = Some(rx);
if let Some(rw) = state.read_waiter_tx.take() {
let _ = rw.send(());
}
}
}
}
}
impl AsyncRead for PeerHandle {}
impl Write for PeerHandle {
fn write(&mut self, b: &[u8]) -> Result<usize, IoError> {
let mut state = self.0.borrow_mut();
let mut do_reconnect = false;
let mut finished = false;
loop {
if do_reconnect {
state.reconnect();
do_reconnect = false;
} else if finished {
state.p = None;
state.ph = Phase::Idle;
return Ok(b.len());
} else {
let mut ph = state.ph.clone();
{
getpeer!(state -> p);
match ph {
Phase::Idle => {
match p.1.write(b) {
Ok(0) => {
info!("End-of-file write?");
return Ok(0);
}
Err(e) => {
if e.kind() == ::std::io::ErrorKind::WouldBlock {
return Err(e);
}
warn!("{}", e);
return Err(e);
}
Ok(x) if x == b.len() => {
debug!("Full write");
// A successful write. Flushing and closing the peer.
ph = Phase::Flushing;
},
Ok(x) => {
debug!("Partial write of {} bytes", x);
// A partial write. Creating write debt.
let debt = b[x..b.len()].to_vec();
ph = Phase::WriteDebt(debt);
}
}
},
Phase::WriteDebt(d) => {
match p.1.write(&d[..]) {
Ok(0) => {
info!("End-of-file write v2?");
return Ok(0);
}
Err(e) => {
if e.kind() == ::std::io::ErrorKind::WouldBlock {
return Err(e);
}
warn!("{}", e);
return Err(e);
}
Ok(x) if x == d.len() => {
debug!("Closing the debt");
// A successful write. Flushing and closing the peer.
ph = Phase::Flushing;
},
Ok(x) => {
debug!("Partial write of {} debt bytes", x);
// A partial write. Retaining the write debt.
let debt = d[x..d.len()].to_vec();
ph = Phase::WriteDebt(debt);
}
}
},
Phase::Flushing => {
match p.1.flush() {
Err(e) => {
if e.kind() == ::std::io::ErrorKind::WouldBlock {
return Err(e);
}
warn!("{}", e);
return Err(e);
}
Ok(()) => {
debug!("Flushed");
ph = Phase::Closing;
}
}
},
Phase::Closing => {
match p.1.shutdown() {
Err(e) => {
if e.kind() == ::std::io::ErrorKind::WouldBlock {
return Err(e);
}
warn!("{}", e);
return Err(e);
},
Ok(Async::NotReady) => {
return wouldblock();
},
Ok(Async::Ready(())) => {
if state.need_wait_for_reading {
if state.finished_reading {
debug!("Closed and reading is also done");
finished=true;
} else {
debug!("Closed, but need to wait for other direction to finish");
ph = Phase::WaitingForReadToFinish;
let (tx,rx) = futures::sync::oneshot::channel();
state.read_waiter_tx = Some(tx);
state.read_waiter_rx = Some(rx);
}
} else {
debug!("Closed");
finished=true;
}
}
}
},
Phase::WaitingForReadToFinish => {
match state.read_waiter_rx.as_mut().unwrap().poll() {
Ok(Async::NotReady) => {
return wouldblock();
}
_ => {
debug!("Waited for read to finish");
finished=true;
}
}
}
}
}
state.ph = ph;
}
}
}
fn flush(&mut self) -> Result<(), IoError> {
// No-op here: we flush and close after each write
Ok(())
}
}
impl AsyncWrite for PeerHandle {
fn shutdown(&mut self) -> futures::Poll<(), IoError> {
// No-op here: we flush and close after each write
Ok(Async::Ready(()))
}
}
pub fn foreachmsg_peer(s: Rc<dyn Specifier>, cp: ConstructParams) -> BoxedNewPeerFuture {
let need_wait_for_reading = cp.program_options.foreachmsg_wait_reads;
let s = Rc::new(RefCell::new(State {
cp,
s,
p: None,
n: None,
aux: Default::default(),
ph: Phase::Idle,
finished_reading: false,
read_waiter_tx: None,
read_waiter_rx: None,
wait_for_new_peer_rx: None,
wait_for_new_peer_tx: None,
need_wait_for_reading,
}));
let ph1 = PeerHandle(s.clone());
let ph2 = PeerHandle(s);
let peer = Peer::new(ph1, ph2, None /* we handle hups ourselves */);
Box::new(ok(peer)) as BoxedNewPeerFuture
}