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Fix timing issue in obtaining the Fork (#2158)

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## Issue Addressed

Related PR: https://github.com/sigp/lighthouse/pull/2137#issuecomment-754712492

The Fork is required for VC to perform signing. Currently, it is not guaranteed that the Fork has been obtained at the point of the signing as the Fork is obtained at after ForkService starts. We will see the [error](851a4dca3c/validator_client/src/validator_store.rs (L127)) if VC could not perform the signing due to the timing issue.

> Unable to get Fork for signing

## Proposed Changes

Obtain the Fork on `init_from_beacon_node` to fix the timing issue.
This commit is contained in:
Akihito Nakano
2021-01-19 02:54:18 +00:00
parent 908c8eadf3
commit a8d040c821
3 changed files with 50 additions and 23 deletions
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36
validator_client/src/lib.rs
View File

@@ -27,6 +27,7 @@ use block_service::{BlockService, BlockServiceBuilder};
use clap::ArgMatches;
use duties_service::{DutiesService, DutiesServiceBuilder};
use environment::RuntimeContext;
use eth2::types::StateId;
use eth2::{reqwest::ClientBuilder, BeaconNodeHttpClient, StatusCode, Url};
use fork_service::{ForkService, ForkServiceBuilder};
use futures::channel::mpsc;
@@ -43,7 +44,7 @@ use std::net::SocketAddr;
use std::sync::Arc;
use std::time::{SystemTime, UNIX_EPOCH};
use tokio::time::{sleep, Duration};
use types::{EthSpec, Hash256};
use types::{EthSpec, Fork, Hash256};
use validator_store::ValidatorStore;
/// The interval between attempts to contact the beacon node during startup.
@@ -234,7 +235,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
BeaconNodeFallback::new(candidates, context.eth2_config.spec.clone(), log.clone());
// Perform some potentially long-running initialization tasks.
let (genesis_time, genesis_validators_root) = tokio::select! {
let (genesis_time, genesis_validators_root, fork) = tokio::select! {
tuple = init_from_beacon_node(&beacon_nodes, &context) => tuple?,
() = context.executor.exit() => return Err("Shutting down".to_string())
};
@@ -255,6 +256,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
start_fallback_updater_service(context.clone(), beacon_nodes.clone())?;
let fork_service = ForkServiceBuilder::new()
.fork(fork)
.slot_clock(slot_clock.clone())
.beacon_nodes(beacon_nodes.clone())
.log(log.clone())
@@ -394,7 +396,7 @@ impl<T: EthSpec> ProductionValidatorClient<T> {
async fn init_from_beacon_node<E: EthSpec>(
beacon_nodes: &BeaconNodeFallback<SystemTimeSlotClock, E>,
context: &RuntimeContext<E>,
) -> Result<(u64, Hash256), String> {
) -> Result<(u64, Hash256, Fork), String> {
loop {
beacon_nodes.update_unready_candidates().await;
let num_available = beacon_nodes.num_available().await;
@@ -453,7 +455,33 @@ async fn init_from_beacon_node<E: EthSpec>(
sleep(RETRY_DELAY).await;
};
Ok((genesis.genesis_time, genesis.genesis_validators_root))
let fork = loop {
match beacon_nodes
.first_success(RequireSynced::No, |node| async move {
node.get_beacon_states_fork(StateId::Head).await
})
.await
{
Ok(Some(fork)) => break fork.data,
Ok(None) => {
info!(
context.log(),
"Failed to get fork, state not found";
);
}
Err(errors) => {
error!(
context.log(),
"Failed to get fork";
"error" => %errors
);
}
}
sleep(RETRY_DELAY).await;
};
Ok((genesis.genesis_time, genesis.genesis_validators_root, fork))
}
async fn wait_for_genesis<E: EthSpec>(