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lib.rs
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lib.rs
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//! A timer service for the beacon node.
//!
//! This service allows task execution on the beacon node for various functionality.
use beacon_chain::{BeaconChain, BeaconChainTypes};
use slog::{debug, info, warn};
use slot_clock::SlotClock;
use std::sync::Arc;
use tokio::time::sleep;
/// Spawns a timer service which periodically executes tasks for the beacon chain
pub fn spawn_timer<T: BeaconChainTypes>(
executor: task_executor::TaskExecutor,
beacon_chain: Arc<BeaconChain<T>>,
) -> Result<(), &'static str> {
let log = executor.log();
let per_slot_executor = executor.clone();
let timer_future = async move {
let log = per_slot_executor.log().clone();
loop {
let duration_to_next_slot = match beacon_chain.slot_clock.duration_to_next_slot() {
Some(duration) => duration,
None => {
warn!(log, "Unable to determine duration to next slot");
return;
}
};
sleep(duration_to_next_slot).await;
let chain = beacon_chain.clone();
if let Some(handle) = per_slot_executor
.spawn_blocking_handle(move || chain.per_slot_task(), "timer_per_slot_task")
{
if let Err(e) = handle.await {
warn!(
log,
"Per slot task failed";
"info" => ?e
);
}
} else {
debug!(
log,
"Per slot task timer stopped";
"info" => "shutting down"
);
break;
}
}
};
executor.spawn(timer_future, "timer");
info!(log, "Timer service started");
Ok(())
}