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Weak subjectivity start from genesis (#1675)

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This commit was edited by Paul H when rebasing from master to
v0.3.0-staging.

Solution 2 proposed here: https://github.com/sigp/lighthouse/issues/1435#issuecomment-692317639

- Adds an optional `--wss-checkpoint` flag that takes a string `root:epoch`
- Verify that the given checkpoint exists in the chain, or that the the chain syncs through this checkpoint. If not, shutdown and prompt the user to purge state before restarting.

Co-authored-by: Paul Hauner <paul@paulhauner.com>
This commit is contained in:
realbigsean
2020-10-01 01:41:58 +00:00
committed by Paul Hauner
parent 6ea3bc5e52
commit 255cc25623
16 changed files with 586 additions and 19 deletions
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36
beacon_node/beacon_chain/src/builder.rs
View File

@@ -18,6 +18,7 @@ use crate::{
};
use eth1::Config as Eth1Config;
use fork_choice::ForkChoice;
use futures::channel::mpsc::Sender;
use operation_pool::{OperationPool, PersistedOperationPool};
use parking_lot::RwLock;
use slog::{info, Logger};
@@ -107,6 +108,7 @@ pub struct BeaconChainBuilder<T: BeaconChainTypes> {
eth1_chain: Option<Eth1Chain<T::Eth1Chain, T::EthSpec>>,
event_handler: Option<T::EventHandler>,
slot_clock: Option<T::SlotClock>,
shutdown_sender: Option<Sender<&'static str>>,
head_tracker: Option<HeadTracker>,
data_dir: Option<PathBuf>,
pubkey_cache_path: Option<PathBuf>,
@@ -154,6 +156,7 @@ where
eth1_chain: None,
event_handler: None,
slot_clock: None,
shutdown_sender: None,
head_tracker: None,
pubkey_cache_path: None,
data_dir: None,
@@ -410,6 +413,12 @@ where
self
}
/// Sets a `Sender` to allow the beacon chain to send shutdown signals.
pub fn shutdown_sender(mut self, sender: Sender<&'static str>) -> Self {
self.shutdown_sender = Some(sender);
self
}
/// Creates a new, empty operation pool.
fn empty_op_pool(mut self) -> Self {
self.op_pool = Some(OperationPool::new());
@@ -581,6 +590,9 @@ where
shuffling_cache: TimeoutRwLock::new(ShufflingCache::new()),
validator_pubkey_cache: TimeoutRwLock::new(validator_pubkey_cache),
disabled_forks: self.disabled_forks,
shutdown_sender: self
.shutdown_sender
.ok_or_else(|| "Cannot build without a shutdown sender.".to_string())?,
log: log.clone(),
graffiti: self.graffiti,
};
@@ -589,6 +601,27 @@ where
.head()
.map_err(|e| format!("Failed to get head: {:?}", e))?;
// Only perform the check if it was configured.
if let Some(wss_checkpoint) = beacon_chain.config.weak_subjectivity_checkpoint {
if let Err(e) = beacon_chain.verify_weak_subjectivity_checkpoint(
wss_checkpoint,
head.beacon_block_root,
&head.beacon_state,
) {
crit!(
log,
"Weak subjectivity checkpoint verification failed on startup!";
"head_block_root" => format!("{}", head.beacon_block_root),
"head_slot" => format!("{}", head.beacon_block.slot()),
"finalized_epoch" => format!("{}", head.beacon_state.finalized_checkpoint.epoch),
"wss_checkpoint_epoch" => format!("{}", wss_checkpoint.epoch),
"error" => format!("{:?}", e),
);
crit!(log, "You must use the `--purge-db` flag to clear the database and restart sync. You may be on a hostile network.");
return Err(format!("Weak subjectivity verification failed: {:?}", e));
}
}
info!(
log,
"Beacon chain initialized";
@@ -767,6 +800,8 @@ mod test {
)
.expect("should create interop genesis state");
let (shutdown_tx, _) = futures::channel::mpsc::channel(1);
let chain = BeaconChainBuilder::new(MinimalEthSpec)
.logger(log.clone())
.store(Arc::new(store))
@@ -779,6 +814,7 @@ mod test {
.null_event_handler()
.testing_slot_clock(Duration::from_secs(1))
.expect("should configure testing slot clock")
.shutdown_sender(shutdown_tx)
.build()
.expect("should build");