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use crate::protocol;
use futures::prelude::*;
use libp2p_core::ProtocolsHandlerEvent;
use libp2p_core::protocols_handler::{KeepAlive, OneShotHandler, ProtocolsHandler, ProtocolsHandlerUpgrErr};
use std::{io, time::Duration, time::Instant};
use tokio_io::{AsyncRead, AsyncWrite};
use tokio_timer::Delay;
pub struct PingHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
inner: OneShotHandler<TSubstream, protocol::Ping, protocol::Ping, protocol::PingOutput>,
delay_to_next_ping: Duration,
next_ping: Delay,
}
impl<TSubstream> PingHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
pub fn new() -> Self {
PingHandler {
inner: OneShotHandler::default(),
next_ping: Delay::new(Instant::now()),
delay_to_next_ping: Duration::from_secs(15),
}
}
}
impl<TSubstream> Default for PingHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
#[inline]
fn default() -> Self {
PingHandler::new()
}
}
impl<TSubstream> ProtocolsHandler for PingHandler<TSubstream>
where
TSubstream: AsyncRead + AsyncWrite,
{
type InEvent = void::Void;
type OutEvent = protocol::PingOutput;
type Error = ProtocolsHandlerUpgrErr<io::Error>;
type Substream = TSubstream;
type InboundProtocol = protocol::Ping;
type OutboundProtocol = protocol::Ping;
type OutboundOpenInfo = ();
fn listen_protocol(&self) -> Self::InboundProtocol {
self.inner.listen_protocol()
}
fn inject_fully_negotiated_inbound(&mut self, protocol: ()) {
self.inner.inject_fully_negotiated_inbound(protocol)
}
fn inject_fully_negotiated_outbound(&mut self, duration: Duration, info: Self::OutboundOpenInfo) {
self.inner.inject_fully_negotiated_outbound(duration, info)
}
fn inject_event(&mut self, event: void::Void) {
void::unreachable(event)
}
fn inject_dial_upgrade_error(&mut self, info: Self::OutboundOpenInfo, error: ProtocolsHandlerUpgrErr<io::Error>) {
self.inner.inject_dial_upgrade_error(info, error)
}
fn connection_keep_alive(&self) -> KeepAlive {
self.inner.connection_keep_alive()
}
fn poll(
&mut self,
) -> Poll<
ProtocolsHandlerEvent<Self::OutboundProtocol, Self::OutboundOpenInfo, Self::OutEvent>,
Self::Error,
> {
match self.next_ping.poll() {
Ok(Async::Ready(())) => {
self.inner.inject_event(protocol::Ping::default());
self.next_ping.reset(Instant::now() + Duration::from_secs(3600));
},
Ok(Async::NotReady) => (),
Err(_) => (),
};
let event = self.inner.poll();
if let Ok(Async::Ready(ProtocolsHandlerEvent::Custom(protocol::PingOutput::Ping(_)))) = event {
self.next_ping.reset(Instant::now() + self.delay_to_next_ping);
}
event
}
}