Fix clippy lints

lighthouse/db/memory_db.rs

@@ -28,7 +28,7 @@ impl MemoryDB {
     pub fn open() -> Self {
         let db: DBHashMap = HashMap::new();
         let mut known_columns: ColumnHashSet = HashSet::new();
-        for col in COLUMNS.iter() {
+        for col in &COLUMNS {
             known_columns.insert(col.to_string());
         }
         Self {

lighthouse/db/stores/pow_chain_store.rs

@@ -21,7 +21,7 @@ impl<T: ClientDB> PoWChainStore<T> {
     pub fn put_block_hash(&self, hash: &[u8])
         -> Result<(), DBError>
     {
-        self.db.put(DB_COLUMN, hash, &vec![0])
+        self.db.put(DB_COLUMN, hash, &[0])
     }
 
     pub fn block_hash_exists(&self, hash: &[u8])

lighthouse/db/stores/validator_store.rs

@@ -42,7 +42,7 @@ impl<T: ClientDB> ValidatorStore<T> {
         }
     }
 
-    fn prefix_bytes(&self, key_prefix: KeyPrefixes)
+    fn prefix_bytes(&self, key_prefix: &KeyPrefixes)
         -> Vec<u8>
     {
         match key_prefix {
@@ -50,7 +50,7 @@ impl<T: ClientDB> ValidatorStore<T> {
         }
     }
 
-    fn get_db_key_for_index(&self, key_prefix: KeyPrefixes, index: usize)
+    fn get_db_key_for_index(&self, key_prefix: &KeyPrefixes, index: usize)
         -> Vec<u8>
     {
         let mut buf = BytesMut::with_capacity(6 + 8);
@@ -62,16 +62,16 @@ impl<T: ClientDB> ValidatorStore<T> {
     pub fn put_public_key_by_index(&self, index: usize, public_key: &PublicKey)
         -> Result<(), ValidatorStoreError>
     {
-        let key = self.get_db_key_for_index(KeyPrefixes::PublicKey, index);
+        let key = self.get_db_key_for_index(&KeyPrefixes::PublicKey, index);
         let val = public_key.as_bytes();
         self.db.put(DB_COLUMN, &key[..], &val[..])
-                    .map_err(|e| ValidatorStoreError::from(e))
+                    .map_err(ValidatorStoreError::from)
     }
 
     pub fn get_public_key_by_index(&self, index: usize)
         -> Result<Option<PublicKey>, ValidatorStoreError>
     {
-        let key = self.get_db_key_for_index(KeyPrefixes::PublicKey, index);
+        let key = self.get_db_key_for_index(&KeyPrefixes::PublicKey, index);
         let val = self.db.get(DB_COLUMN, &key[..])?;
         match val {
             None => Ok(None),
@@ -129,7 +129,7 @@ mod tests {
         let db = Arc::new(MemoryDB::open());
         let store = ValidatorStore::new(db.clone());
 
-        let key = store.get_db_key_for_index(KeyPrefixes::PublicKey, 42);
+        let key = store.get_db_key_for_index(&KeyPrefixes::PublicKey, 42);
         db.put(DB_COLUMN, &key[..], "cats".as_bytes()).unwrap();
 
         assert_eq!(store.get_public_key_by_index(42),

lighthouse/state/attestation_record/mod.rs

@@ -3,10 +3,10 @@ use super::ssz;
 use super::utils;
 
 
-mod attestation_record;
+mod structs;
 mod ssz_splitter;
 
-pub use self::attestation_record::{
+pub use self::structs::{
     AttestationRecord,
     MIN_SSZ_ATTESTION_RECORD_LENGTH,
 };

lighthouse/state/attestation_record/ssz_splitter.rs

@@ -24,8 +24,8 @@ pub fn split_all_attestations<'a>(full_ssz: &'a [u8], index: usize)
 
 /// Given some ssz slice, find the bounds of one serialized AttestationRecord
 /// and return a slice pointing to that.
-pub fn split_one_attestation<'a>(full_ssz: &'a [u8], index: usize)
-    -> Result<(&'a [u8], usize), AttestationSplitError>
+pub fn split_one_attestation(full_ssz: &[u8], index: usize)
+    -> Result<(&[u8], usize), AttestationSplitError>
 {
     if full_ssz.len() < MIN_LENGTH {
         return Err(AttestationSplitError::TooShort);

lighthouse/state/block/mod.rs

@@ -4,8 +4,8 @@ use super::ssz;
 use super::utils;
 use super::attestation_record;
 
-mod block;
+mod structs;
 mod ssz_block;
 
-pub use self::block::Block;
+pub use self::structs::Block;
 pub use self::ssz_block::SszBlock;

lighthouse/state/block/ssz_block.rs

@@ -3,7 +3,7 @@ use super::ssz::decode::{
     Decodable,
 };
 use super::utils::hash::canonical_hash;
-use super::block::{
+use super::structs::{
     MIN_SSZ_BLOCK_LENGTH,
     MAX_SSZ_BLOCK_LENGTH,
 };
@@ -146,7 +146,7 @@ impl<'a> SszBlock<'a> {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use super::super::block::Block;
+    use super::super::structs::Block;
     use super::super::attestation_record::AttestationRecord;
     use super::super::ssz::SszStream;
     use super::super::utils::types::Hash256;

lighthouse/state/chain_config.rs

@@ -8,7 +8,7 @@ pub struct ChainConfig {
 /*
  * Presently this is just some arbitrary time in Sept 2018.
  */
-const GENESIS_TIME: u64 = 1537488655;
+const GENESIS_TIME: u64 = 1_537_488_655;
 
 impl ChainConfig {
     pub fn standard() -> Self {

lighthouse/state/common/delegation/block_hash.rs

@@ -6,10 +6,10 @@ use super::utils::types::Hash256;
  */
 
 pub fn get_block_hash(
-    active_state_recent_block_hashes: &Vec<Hash256>,
-    current_block_slot: &u64,
-    slot: &u64,
-    cycle_length: &u64, // convert from standard u8
+    active_state_recent_block_hashes: &[Hash256],
+    current_block_slot: u64,
+    slot: u64,
+    cycle_length: u64, // convert from standard u8
 ) -> Result<Hash256, ParameterError> {
     // active_state must have at 2*cycle_length hashes
     assert_error!(
@@ -19,16 +19,16 @@ pub fn get_block_hash(
         ))
     );
 
-    let state_start_slot = (*current_block_slot)
+    let state_start_slot = (current_block_slot)
         .checked_sub(cycle_length * 2)
         .unwrap_or(0);
 
     assert_error!(
-        (state_start_slot <= *slot) && (*slot < *current_block_slot),
+        (state_start_slot <= slot) && (slot < current_block_slot),
         ParameterError::InvalidInput(String::from("incorrect slot number"))
     );
 
-    let index = 2 * cycle_length + (*slot) - *current_block_slot; // should always be positive
+    let index = 2 * cycle_length + slot - current_block_slot; // should always be positive
     Ok(active_state_recent_block_hashes[index as usize])
 }
 
@@ -47,13 +47,16 @@ mod tests {
             block_hashes.push(Hash256::random());
         }
 
-        let result = get_block_hash(&block_hashes, &block_slot, &slot, &cycle_length).unwrap();
+        let result = get_block_hash(
+            &block_hashes,
+            block_slot,
+            slot,
+            cycle_length)
+            .unwrap();
 
         assert_eq!(
             result,
             block_hashes[(2 * cycle_length + slot - block_slot) as usize]
         );
-
-        println!("{:?}", result);
     }
 }