refactor how a user can get a Clock for the configured network

ethereum-consensus/src/lib.rs

@@ -9,6 +9,7 @@ pub mod deneb;
 pub mod domains;
 pub mod kzg;
 pub mod networking;
+pub mod networks;
 pub mod phase0;
 pub mod primitives;
 #[cfg(feature = "serde")]

ethereum-consensus/src/networks.rs

@@ -0,0 +1,8 @@
+/// This module contains support for various Ethereum netowrks.
+use crate::state_transition::Context;
+
+// NOTE: the default genesis time here is usually seen on testnets
+// where we have control over the genesis details
+pub fn typical_genesis_time(context: &Context) -> u64 {
+ context.min_genesis_time + context.genesis_delay
+}

ethereum-consensus/src/state_transition/context.rs

@@ -286,18 +286,16 @@ impl Context {
  }
  }
 
- pub fn clock(&self, genesis_time: Option<u64>) -> Clock<SystemTimeProvider> {
+ pub fn clock(&self) -> Option<Clock<SystemTimeProvider>> {
  match self.name.as_ref() {
- "mainnet" => clock::for_mainnet(),
- "sepolia" => clock::for_sepolia(),
- "goerli" => clock::for_goerli(),
- _ => {
- // NOTE: the default genesis time here is usually seen on testnets
- // where we have control over the genesis details
- let genesis_time =
- genesis_time.unwrap_or(self.min_genesis_time + self.genesis_delay);
- clock::from_system_time(genesis_time, self.seconds_per_slot, self.slots_per_epoch)
- }
+ "mainnet" => Some(clock::for_mainnet()),
+ "sepolia" => Some(clock::for_sepolia()),
+ "goerli" => Some(clock::for_goerli()),
+ _ => None,
  }
  }
+
+ pub fn clock_at(&self, genesis_time: u64) -> Clock<SystemTimeProvider> {
+ clock::from_system_time(genesis_time, self.seconds_per_slot, self.slots_per_epoch)
+ }
 }