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// Copyright 2020 Parity Technologies (UK) Ltd.
// This file is part of Polkadot.
// Polkadot is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// Polkadot is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
//! Shows a basic usage of the `Overseer`:
//! * Spawning subsystems and subsystem child jobs
//! * Establishing message passing
use std::time::Duration;
use futures::{
pending, pin_mut, executor, select, stream,
FutureExt, StreamExt,
};
use futures_timer::Delay;
use kv_log_macro as log;
use overseer::{
AllMessages, CandidateBackingSubsystemMessage, FromOverseer,
Overseer, Subsystem, SubsystemContext, SpawnedSubsystem, ValidationSubsystemMessage,
};
struct Subsystem1;
impl Subsystem1 {
async fn run(mut ctx: SubsystemContext<CandidateBackingSubsystemMessage>) {
loop {
match ctx.try_recv().await {
Ok(Some(msg)) => {
if let FromOverseer::Communication { msg } = msg {
log::info!("msg {:?}", msg);
}
continue;
}
Ok(None) => (),
Err(_) => {
log::info!("exiting");
return;
}
}
Delay::new(Duration::from_secs(1)).await;
ctx.send_msg(AllMessages::Validation(
ValidationSubsystemMessage::ValidityAttestation
)).await.unwrap();
}
}
}
impl Subsystem<CandidateBackingSubsystemMessage> for Subsystem1 {
fn start(&mut self, ctx: SubsystemContext<CandidateBackingSubsystemMessage>) -> SpawnedSubsystem {
SpawnedSubsystem(Box::pin(async move {
Self::run(ctx).await;
}))
}
}
struct Subsystem2;
impl Subsystem2 {
async fn run(mut ctx: SubsystemContext<ValidationSubsystemMessage>) {
ctx.spawn(Box::pin(async {
loop {
log::info!("Job tick");
Delay::new(Duration::from_secs(1)).await;
}
})).await.unwrap();
loop {
match ctx.try_recv().await {
Ok(Some(msg)) => {
log::info!("Subsystem2 received message {:?}", msg);
continue;
}
Ok(None) => { pending!(); }
Err(_) => {
log::info!("exiting");
return;
},
}
}
}
}
impl Subsystem<ValidationSubsystemMessage> for Subsystem2 {
fn start(&mut self, ctx: SubsystemContext<ValidationSubsystemMessage>) -> SpawnedSubsystem {
SpawnedSubsystem(Box::pin(async move {
Self::run(ctx).await;
}))
}
}
fn main() {
femme::with_level(femme::LevelFilter::Trace);
let spawner = executor::ThreadPool::new().unwrap();
futures::executor::block_on(async {
let timer_stream = stream::repeat(()).then(|_| async {
Delay::new(Duration::from_secs(1)).await;
});
let (overseer, _handler) = Overseer::new(
Box::new(Subsystem2),
Box::new(Subsystem1),
spawner,
).unwrap();
let overseer_fut = overseer.run().fuse();
let timer_stream = timer_stream;
pin_mut!(timer_stream);
pin_mut!(overseer_fut);
loop {
select! {
_ = overseer_fut => break,
_ = timer_stream.next() => {
log::info!("tick");
}
complete => break,
}
}
});
}