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verify finality updates

This commit is contained in:
Noah Citron 2022-08-16 11:41:17 -04:00
parent e30be6871b
commit 0c715d29a8
1 changed files with 62 additions and 17 deletions
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79
src/main.rs
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@ -64,16 +64,33 @@ impl LightClient {
let updates = self.get_updates(next_period).await?;
for mut update in updates {
self.proccess_update(&mut update)?;
return Ok(());
self.verify_update(&mut update)?;
self.apply_update(&update);
println!("================================");
}
let finality_update = self.get_finality_update().await?;
let mut finality_update_generic = Update {
attested_header: finality_update.attested_header,
next_sync_committee: None,
next_sync_committee_branch: Vec::new(),
finalized_header: finality_update.finalized_header,
finality_branch: finality_update.finality_branch,
sync_aggregate: finality_update.sync_aggregate,
signature_slot: finality_update.signature_slot,
};
self.verify_update(&mut finality_update_generic)?;
self.apply_update(&finality_update_generic);
println!("synced up to slot: {}", self.store.header.slot);
Ok(())
}
fn proccess_update(&mut self, update: &mut Update) -> Result<()> {
fn verify_update(&mut self, update: &mut Update) -> Result<()> {
let current_slot = self.store.header.slot;
let update_slot = update.attested_header.slot;
let update_slot = update.finalized_header.slot;
let current_period = calc_sync_period(current_slot);
let update_period = calc_sync_period(update_slot);
@ -81,9 +98,9 @@ impl LightClient {
println!("current period: {}", current_period);
println!("update period: {}", update_period);
// if !(update_period == current_period + 1) {
// return Err(eyre::eyre!("Invalid Update"));
// }
if !(update_period == current_period + 1 || update_period == current_period) {
return Err(eyre::eyre!("Invalid Update"));
}
if !(update.signature_slot > update.attested_header.slot && update.attested_header.slot > update.finalized_header.slot) {
return Err(eyre::eyre!("Invalid Update"));
@ -95,15 +112,27 @@ impl LightClient {
let finality_branch_valid = is_valid_merkle_branch(&finality_header_hash, finality_branch.iter(), 6, 41, &update_header_root);
println!("finality branch valid: {}", finality_branch_valid);
let next_committee_hash = update.next_sync_committee.hash_tree_root()?;
let next_committee_branch = branch_to_nodes(update.next_sync_committee_branch.clone());
let next_committee_branch_valid = is_valid_merkle_branch(&next_committee_hash, next_committee_branch.iter(), 5, 23, &update_header_root);
println!("next sync committee branch valid: {}", next_committee_branch_valid);
if update.next_sync_committee.is_some() {
let next_committee_hash = update.next_sync_committee.as_ref().unwrap().clone().hash_tree_root()?;
let next_committee_branch = branch_to_nodes(update.next_sync_committee_branch.clone());
let next_committee_branch_valid = is_valid_merkle_branch(&next_committee_hash, next_committee_branch.iter(), 5, 23, &update_header_root);
println!("next sync committee branch valid: {}", next_committee_branch_valid);
if !(finality_branch_valid && next_committee_branch_valid) {
if !next_committee_branch_valid {
return Err(eyre::eyre!("Invalid Update"));
}
}
if !(finality_branch_valid) {
return Err(eyre::eyre!("Invalid Update"));
}
let sync_committee = if current_period == update_period {
&self.store.current_sync_committee
} else {
self.store.next_sync_committee.as_ref().unwrap()
};
let bytes = hex::decode(update.sync_aggregate.sync_committee_bits.strip_prefix("0x").unwrap())?;
let mut bits = String::new();
let mut count = 0;
@ -116,7 +145,7 @@ impl LightClient {
let mut pks: Vec<PublicKey> = Vec::new();
bits.chars().enumerate().for_each(|(i, bit)| {
if bit == '1' {
let pk = self.store.current_sync_committee.pubkeys[i].clone();
let pk = sync_committee.pubkeys[i].clone();
let pk = PublicKey::from_bytes(&pk).unwrap();
pks.push(pk)
}
@ -143,10 +172,24 @@ impl LightClient {
return Err(eyre::eyre!("Invalid Update"));
}
Ok(())
}
fn apply_update(&mut self, update: &Update) {
let current_period = calc_sync_period(self.store.header.slot);
let update_period = calc_sync_period(update.finalized_header.slot);
self.store.header = update.finalized_header.clone();
if self.store.next_sync_committee.is_none() {
self.store.next_sync_committee = Some(update.next_sync_committee.as_ref().unwrap().clone());
} else if update_period == current_period + 1 {
self.store.current_sync_committee = self.store.next_sync_committee.as_ref().unwrap().clone();
self.store.next_sync_committee = Some(update.next_sync_committee.as_ref().unwrap().clone());
}
}
async fn get_bootstrap(rpc: &str, block_root: &str) -> Result<Bootstrap> {
let req = format!("{}/eth/v0/beacon/light_client/bootstrap/{}", rpc, block_root);
let res = reqwest::get(req).await?.json::<BootstrapResponse>().await?;
@ -302,7 +345,7 @@ struct UpdateResponse {
#[derive(serde::Deserialize, Debug, Clone)]
struct Update {
attested_header: Header,
next_sync_committee: SyncCommittee,
next_sync_committee: Option<SyncCommittee>,
#[serde(deserialize_with = "branch_deserialize")]
next_sync_committee_branch: Vec<Bytes32>,
finalized_header: Header,
@ -328,8 +371,10 @@ struct FinalityUpdateResponse {
struct FinalityUpdate {
attested_header: Header,
finalized_header: Header,
finality_branch: Vec<String>,
#[serde(deserialize_with = "branch_deserialize")]
finality_branch: Vec<Bytes32>,
sync_aggregate: SyncAggregate,
signature_slot: String,
#[serde(deserialize_with = "u64_deserialize")]
signature_slot: u64,
}