Strip out anitquated parts of chain crate

beacon_chain/chain/src/block_processing.rs

@@ -19,8 +19,8 @@ where
 {
     pub fn process_block(
         &mut self,
-        ssz: &[u8],
-        present_slot: u64,
+        _ssz: &[u8],
+        _present_slot: u64,
     ) -> Result<(BlockProcessingOutcome, Hash256), Error> {
         // TODO: block processing has been removed.
         // https://github.com/sigp/lighthouse/issues/98

beacon_chain/chain/src/genesis.rs

@@ -1,22 +1,24 @@
-use super::{ActiveState, BeaconChainError, ChainConfig, CrystallizedState};
-use types::{CrosslinkRecord, Hash256, ValidatorStatus};
+use super::{ActiveState, ChainConfig, CrystallizedState};
+use types::ValidatorStatus;
 use validator_induction::ValidatorInductor;
 use validator_shuffling::{shard_and_committees_for_cycle, ValidatorAssignmentError};
 
-pub const INITIAL_FORK_VERSION: u32 = 0;
+#[derive(Debug, PartialEq)]
+pub enum Error {
+    ValidationAssignmentError(ValidatorAssignmentError),
+    NotImplemented,
+}
 
-impl From<ValidatorAssignmentError> for BeaconChainError {
-    fn from(_: ValidatorAssignmentError) -> BeaconChainError {
-        BeaconChainError::InvalidGenesis
+impl From<ValidatorAssignmentError> for Error {
+    fn from(e: ValidatorAssignmentError) -> Error {
+        Error::ValidationAssignmentError(e)
     }
 }
 
 /// Initialize a new ChainHead with genesis parameters.
 ///
 /// Used when syncing a chain from scratch.
-pub fn genesis_states(
-    config: &ChainConfig,
-) -> Result<(ActiveState, CrystallizedState), ValidatorAssignmentError> {
+pub fn genesis_states(config: &ChainConfig) -> Result<(ActiveState, CrystallizedState), Error> {
     /*
      * Parse the ValidatorRegistrations into ValidatorRecords and induct them.
      *
@@ -35,63 +37,17 @@ pub fn genesis_states(
      *
      * Crystallizedstate stores two cycles, so we simply repeat the same assignment twice.
      */
-    let shard_and_committee_for_slots = {
+    let _shard_and_committee_for_slots = {
         let mut a = shard_and_committees_for_cycle(&vec![0; 32], &validators, 0, &config)?;
         let mut b = a.clone();
         a.append(&mut b);
         a
     };
 
-    /*
-     * Set all the crosslink records to reference zero hashes.
-     */
-    let crosslinks = {
-        let mut c = vec![];
-        for _ in 0..config.shard_count {
-            c.push(CrosslinkRecord {
-                recently_changed: false,
-                slot: 0,
-                hash: Hash256::zero(),
-            });
-        }
-        c
-    };
+    // TODO: implement genesis for `BeaconState`
+    // https://github.com/sigp/lighthouse/issues/99
 
-    /*
-     * Initialize a genesis `Crystallizedstate`
-     */
-    let crystallized_state = CrystallizedState {
-        validator_set_change_slot: 0,
-        validators: validators.to_vec(),
-        crosslinks,
-        last_state_recalculation_slot: 0,
-        last_finalized_slot: 0,
-        last_justified_slot: 0,
-        justified_streak: 0,
-        shard_and_committee_for_slots,
-        deposits_penalized_in_period: vec![],
-        validator_set_delta_hash_chain: Hash256::zero(),
-        pre_fork_version: INITIAL_FORK_VERSION,
-        post_fork_version: INITIAL_FORK_VERSION,
-        fork_slot_number: 0,
-    };
-
-    /*
-     * Set all recent block hashes to zero.
-     */
-    let recent_block_hashes = vec![Hash256::zero(); config.cycle_length as usize];
-
-    /*
-     * Create an active state.
-     */
-    let active_state = ActiveState {
-        pending_attestations: vec![],
-        pending_specials: vec![],
-        recent_block_hashes,
-        randao_mix: Hash256::zero(),
-    };
-
-    Ok((active_state, crystallized_state))
+    Err(Error::NotImplemented)
 }
 
 #[cfg(test)]
@@ -99,6 +55,10 @@ mod tests {
     extern crate bls;
     extern crate validator_induction;
 
+    // TODO: implement genesis for `BeaconState`
+    // https://github.com/sigp/lighthouse/issues/99
+    //
+    /*
     use self::bls::{create_proof_of_possession, Keypair};
     use super::*;
     use types::{Address, Hash256, ValidatorRegistration};
@@ -190,4 +150,5 @@ mod tests {
         );
         assert_eq!(cry.validators.len(), good_validator_count);
     }
+    */
 }

beacon_chain/chain/src/lib.rs

@@ -14,7 +14,7 @@ mod stores;
 mod transition;
 
 use db::ClientDB;
-use genesis::genesis_states;
+use genesis::{genesis_states, Error as GenesisError};
 use maps::{generate_attester_and_proposer_maps, AttesterAndProposerMapError};
 use std::collections::HashMap;
 use std::sync::Arc;
@@ -26,6 +26,7 @@ pub enum BeaconChainError {
     InvalidGenesis,
     InsufficientValidators,
     UnableToGenerateMaps(AttesterAndProposerMapError),
+    GenesisError(GenesisError),
     DBError(String),
 }
 
@@ -101,42 +102,8 @@ impl From<AttesterAndProposerMapError> for BeaconChainError {
     }
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-    use db::stores::*;
-    use db::MemoryDB;
-    use std::sync::Arc;
-    use types::ValidatorRegistration;
-
-    #[test]
-    fn test_new_chain() {
-        let mut config = ChainConfig::standard();
-        config.cycle_length = 4;
-        config.shard_count = 4;
-        let db = Arc::new(MemoryDB::open());
-        let store = BeaconChainStore {
-            block: Arc::new(BeaconBlockStore::new(db.clone())),
-            pow_chain: Arc::new(PoWChainStore::new(db.clone())),
-            validator: Arc::new(ValidatorStore::new(db.clone())),
-        };
-
-        for _ in 0..config.cycle_length * 2 {
-            config
-                .initial_validators
-                .push(ValidatorRegistration::random())
-        }
-
-        let chain = BeaconChain::new(store, config.clone()).unwrap();
-        let (act, cry) = genesis_states(&config).unwrap();
-
-        assert_eq!(chain.last_finalized_slot, 0);
-        assert_eq!(chain.canonical_block_hash(), Hash256::zero());
-
-        let stored_act = chain.active_states.get(&Hash256::zero()).unwrap();
-        assert_eq!(act, *stored_act);
-
-        let stored_cry = chain.crystallized_states.get(&Hash256::zero()).unwrap();
-        assert_eq!(cry, *stored_cry);
+impl From<GenesisError> for BeaconChainError {
+    fn from(e: GenesisError) -> BeaconChainError {
+        BeaconChainError::GenesisError(e)
     }
 }

beacon_chain/chain/tests/main.rs

@@ -1,7 +0,0 @@
-extern crate chain;
-
-#[cfg(test)]
-mod tests {
-    use chain::{BeaconChain, BeaconChainError};
-
-}