blob: 6d6c4db3a62b376dfb4f916d354b4e51d663fbe3 [file] [log] [blame]
use futures::{Async, Future, Stream, Poll};
use tokio_io::{AsyncRead, AsyncWrite};
use body::{Body, Payload};
use common::drain::{self, Draining, Signal, Watch, Watching};
use common::exec::{H2Exec, NewSvcExec};
use service::{Service, NewService};
use super::conn::{SpawnAll, UpgradeableConnection, Watcher};
#[allow(missing_debug_implementations)]
pub struct Graceful<I, S, F, E> {
state: State<I, S, F, E>,
}
enum State<I, S, F, E> {
Running {
drain: Option<(Signal, Watch)>,
spawn_all: SpawnAll<I, S, E>,
signal: F,
},
Draining(Draining),
}
impl<I, S, F, E> Graceful<I, S, F, E> {
pub(super) fn new(spawn_all: SpawnAll<I, S, E>, signal: F) -> Self {
let drain = Some(drain::channel());
Graceful {
state: State::Running {
drain,
spawn_all,
signal,
},
}
}
}
impl<I, S, B, F, E> Future for Graceful<I, S, F, E>
where
I: Stream,
I::Error: Into<Box<::std::error::Error + Send + Sync>>,
I::Item: AsyncRead + AsyncWrite + Send + 'static,
S: NewService<ReqBody=Body, ResBody=B>,
S::Service: 'static,
S::Error: Into<Box<::std::error::Error + Send + Sync>>,
B: Payload,
F: Future<Item=()>,
E: H2Exec<<S::Service as Service>::Future, B>,
E: NewSvcExec<I::Item, S::Future, S::Service, E, GracefulWatcher>,
{
type Item = ();
type Error = ::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
loop {
let next = match self.state {
State::Running {
ref mut drain,
ref mut spawn_all,
ref mut signal,
} => match signal.poll() {
Ok(Async::Ready(())) | Err(_) => {
debug!("signal received, starting graceful shutdown");
let sig = drain
.take()
.expect("drain channel")
.0;
State::Draining(sig.drain())
},
Ok(Async::NotReady) => {
let watch = drain
.as_ref()
.expect("drain channel")
.1
.clone();
return spawn_all.poll_watch(&GracefulWatcher(watch));
},
},
State::Draining(ref mut draining) => {
return draining.poll()
.map_err(|()| unreachable!("drain mpsc rx never errors"));
}
};
self.state = next;
}
}
}
#[allow(missing_debug_implementations)]
#[derive(Clone)]
pub struct GracefulWatcher(Watch);
impl<I, S, E> Watcher<I, S, E> for GracefulWatcher
where
I: AsyncRead + AsyncWrite + Send + 'static,
S: Service<ReqBody=Body> + 'static,
E: H2Exec<S::Future, S::ResBody>,
{
type Future = Watching<UpgradeableConnection<I, S, E>, fn(&mut UpgradeableConnection<I, S, E>)>;
fn watch(&self, conn: UpgradeableConnection<I, S, E>) -> Self::Future {
self
.0
.clone()
.watch(conn, on_drain)
}
}
fn on_drain<I, S, E>(conn: &mut UpgradeableConnection<I, S, E>)
where
S: Service<ReqBody=Body>,
S::Error: Into<Box<::std::error::Error + Send + Sync>>,
I: AsyncRead + AsyncWrite,
S::ResBody: Payload + 'static,
E: H2Exec<S::Future, S::ResBody>,
{
conn.graceful_shutdown()
}