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feat: compute epoch length from byron genesis #890

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feat: compute epoch length from byron genesis #890

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8 changes: 4 additions & 4 deletions crates/cardano/src/forks.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,14 +74,14 @@ fn from_conway_drep_voting_thresholds(
}
}

// AFAIK, Byron epoch length is a constant and not available via Genesis files.
const FIVE_DAYS_IN_SECONDS: u64 = 5 * 24 * 60 * 60;
// Byron epochs last 10k slots (10 * k) per cardano-node, where k is protocol_consts.k from Byron genesis.
const BYRON_EPOCH_SLOTS_PER_K: u64 = 10;

pub fn from_byron_genesis(byron: &byron::GenesisFile) -> PParamsSet {
let version = &byron.block_version_data;

let slot_length_in_secs = version.slot_duration / 1000;
let epoch_length = FIVE_DAYS_IN_SECONDS / slot_length_in_secs;
let epoch_length = BYRON_EPOCH_SLOTS_PER_K * byron.protocol_consts.k as u64;

PParamsSet::default()
.with(Val::ProtocolVersion((0, 0)))
Expand Down Expand Up @@ -273,7 +273,7 @@ pub fn protocol_constants(version: u16, genesis: &Genesis) -> ProtocolConstants
match version {
x if x < 2 => {
let slot_length_in_secs = genesis.byron.block_version_data.slot_duration / 1000;
let epoch_length = FIVE_DAYS_IN_SECONDS / slot_length_in_secs;
let epoch_length = BYRON_EPOCH_SLOTS_PER_K * genesis.byron.protocol_consts.k as u64;

ProtocolConstants {
epoch_length,
Expand Down
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