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Allow for customizable recent genesis window

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This commit is contained in:
Paul Hauner
2019-08-29 14:59:32 +10:00
parent 3acd75f876
commit 314780e634
5 changed files with 37 additions and 10 deletions
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15
beacon_node/beacon_chain/src/beacon_chain_builder.rs
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@@ -22,8 +22,13 @@ pub struct BeaconChainBuilder<T: BeaconChainTypes> {
}
impl<T: BeaconChainTypes> BeaconChainBuilder<T> {
pub fn recent_genesis(validator_count: usize, spec: ChainSpec, log: Logger) -> Self {
Self::quick_start(recent_genesis_time(), validator_count, spec, log)
pub fn recent_genesis(
validator_count: usize,
minutes: u64,
spec: ChainSpec,
log: Logger,
) -> Self {
Self::quick_start(recent_genesis_time(minutes), validator_count, spec, log)
}
pub fn quick_start(
@@ -123,12 +128,12 @@ fn genesis_block<T: EthSpec>(genesis_state: &BeaconState<T>, spec: &ChainSpec) -
/// Returns the system time, mod 30 minutes.
///
/// Used for easily creating testnets.
fn recent_genesis_time() -> u64 {
fn recent_genesis_time(minutes: u64) -> u64 {
let now = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)
.unwrap()
.as_secs();
let secs_after_last_period = now.checked_rem(30 * 60).unwrap_or(0);
// genesis is now the last 30 minute block.
let secs_after_last_period = now.checked_rem(minutes * 60).unwrap_or(0);
// genesis is now the last 15 minute block.
now - secs_after_last_period
}