lighthouse-pulse/lighthouse/state/chain_config.rs

pub struct ChainConfig {
    pub cycle_length: u8,
    pub shard_count: u16,
    pub min_committee_size: u64,
    pub genesis_time: u64,
}

/*
 * Presently this is just some arbitrary time in Sept 2018.
 */
const GENESIS_TIME: u64 = 1_537_488_655;

impl ChainConfig {
    pub fn standard() -> Self {
        Self {
            cycle_length: 64,
            shard_count: 1024,
            min_committee_size: 128,
            genesis_time: GENESIS_TIME,   // arbitrary
        }
    }

    #[cfg(test)]
    pub fn super_fast_tests() -> Self {
        Self {
            cycle_length: 2,
            shard_count: 2,
            min_committee_size: 2,
            genesis_time: GENESIS_TIME,   // arbitrary
        }
    }
}