Fix clippy lints

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -191,7 +191,6 @@ where
         count: usize,
         skip: usize,
     ) -> Result<Vec<Hash256>, Error> {
-        let spec = &self.spec;
         let step_by = Slot::from(skip + 1);
 
         let mut roots: Vec<Hash256> = vec![];

beacon_node/client/src/client_types.rs

@@ -1,16 +1,13 @@
-use crate::ClientConfig;
+use crate::{ArcBeaconChain, ClientConfig};
 use beacon_chain::{
     db::{ClientDB, DiskDB, MemoryDB},
     fork_choice::BitwiseLMDGhost,
     initialise,
     slot_clock::{SlotClock, SystemTimeSlotClock},
-    BeaconChain,
 };
 use fork_choice::ForkChoice;
 use types::{BeaconStateTypes, FewValidatorsStateTypes, FoundationStateTypes};
 
-use std::sync::Arc;
-
 pub trait ClientTypes {
     type DB: ClientDB + 'static;
     type SlotClock: SlotClock + 'static;
@@ -19,7 +16,7 @@ pub trait ClientTypes {
 
     fn initialise_beacon_chain(
         config: &ClientConfig,
-    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes>>;
+    ) -> ArcBeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes>;
 }
 
 pub struct StandardClientType;
@@ -32,7 +29,7 @@ impl ClientTypes for StandardClientType {
 
     fn initialise_beacon_chain(
         config: &ClientConfig,
-    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes>> {
+    ) -> ArcBeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes> {
         initialise::initialise_beacon_chain(&config.spec, Some(&config.db_name))
     }
 }
@@ -47,7 +44,7 @@ impl ClientTypes for TestingClientType {
 
     fn initialise_beacon_chain(
         config: &ClientConfig,
-    ) -> Arc<BeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes>> {
+    ) -> ArcBeaconChain<Self::DB, Self::SlotClock, Self::ForkChoice, Self::BeaconStateTypes> {
         initialise::initialise_test_beacon_chain(&config.spec, None)
     }
 }

beacon_node/client/src/lib.rs

@@ -22,13 +22,15 @@ use tokio::runtime::TaskExecutor;
 use tokio::timer::Interval;
 use types::BeaconStateTypes;
 
+type ArcBeaconChain<D, S, F, B> = Arc<BeaconChain<D, S, F, B>>;
+
 /// Main beacon node client service. This provides the connection and initialisation of the clients
 /// sub-services in multiple threads.
 pub struct Client<T: ClientTypes> {
     /// Configuration for the lighthouse client.
     _config: ClientConfig,
     /// The beacon chain for the running client.
-    _beacon_chain: Arc<BeaconChain<T::DB, T::SlotClock, T::ForkChoice, T::BeaconStateTypes>>,
+    _beacon_chain: ArcBeaconChain<T::DB, T::SlotClock, T::ForkChoice, T::BeaconStateTypes>,
     /// Reference to the network service.
     pub network: Arc<NetworkService<T::BeaconStateTypes>>,
     /// Signal to terminate the RPC server.

beacon_node/db/src/disk_db.rs

@@ -97,7 +97,7 @@ impl ClientDB for DiskDB {
             None => Err(DBError {
                 message: "Unknown column".to_string(),
             }),
-            Some(handle) => self.db.put_cf(handle, key, val).map_err(|e| e.into()),
+            Some(handle) => self.db.put_cf(handle, key, val).map_err(Into::into),
         }
     }
 

beacon_node/db/src/stores/beacon_state_store.rs

@@ -2,7 +2,7 @@ use super::STATES_DB_COLUMN as DB_COLUMN;
 use super::{ClientDB, DBError};
 use ssz::decode;
 use std::sync::Arc;
-use types::{BeaconState, BeaconStateTypes, FoundationBeaconState, Hash256};
+use types::{BeaconState, BeaconStateTypes, Hash256};
 
 pub struct BeaconStateStore<T>
 where
@@ -43,7 +43,7 @@ mod tests {
     use ssz::ssz_encode;
     use std::sync::Arc;
     use types::test_utils::{SeedableRng, TestRandom, XorShiftRng};
-    use types::Hash256;
+    use types::{FoundationBeaconState, Hash256};
 
     test_crud_for_store!(BeaconStateStore, DB_COLUMN);
 

beacon_node/network/src/message_handler.rs

@@ -300,7 +300,7 @@ impl NetworkContext {
         let next_id = self
             .outgoing_request_ids
             .entry(peer_id.clone())
-            .and_modify(|id| id.increment())
+            .and_modify(RequestId::increment)
             .or_insert_with(|| RequestId::from(1));
 
         next_id.previous()

eth2/operation_pool/src/lib.rs

@@ -175,11 +175,7 @@ impl<T: BeaconStateTypes> OperationPool<T> {
 
     /// Total number of attestations in the pool, including attestations for the same data.
     pub fn num_attestations(&self) -> usize {
-        self.attestations
-            .read()
-            .values()
-            .map(|atts| atts.len())
-            .sum()
+        self.attestations.read().values().map(Vec::len).sum()
     }
 
     /// Get a list of attestations for inclusion in a block.

eth2/types/src/beacon_state.rs

@@ -817,7 +817,7 @@ impl<T: BeaconStateTypes> BeaconState<T> {
         self.tree_hash_cache
             .tree_hash_root()
             .and_then(|b| Ok(Hash256::from_slice(b)))
-            .map_err(|e| e.into())
+            .map_err(Into::into)
     }
 }
 

eth2/utils/boolean-bitfield/src/lib.rs

@@ -226,7 +226,7 @@ impl Decodable for BooleanBitfield {
 // as the BitVec library and the hex-parser use opposing bit orders.
 fn reverse_bit_order(mut bytes: Vec<u8>) -> Vec<u8> {
     bytes.reverse();
-    bytes.into_iter().map(|b| b.swap_bits()).collect()
+    bytes.into_iter().map(LookupReverse::swap_bits).collect()
 }
 
 impl Serialize for BooleanBitfield {

eth2/utils/fixed_len_vec/src/lib.rs

@@ -22,6 +22,10 @@ impl<T, N: Unsigned> FixedLenVec<T, N> {
         self.vec.len()
     }
 
+    pub fn is_empty(&self) -> bool {
+        self.len() == 0
+    }
+
     pub fn capacity() -> usize {
         N::to_usize()
     }

eth2/utils/hashing/src/lib.rs

@@ -35,7 +35,7 @@ pub fn merkle_root(values: &[Vec<u8>]) -> Option<Vec<u8>> {
     }
 
     // the root hash will be at index 1
-    return Some(o[1].clone());
+    Some(o[1].clone())
 }
 
 #[cfg(test)]

validator_client/src/duties/mod.rs

@@ -51,7 +51,7 @@ impl<U: BeaconNodeDuties, S: Signer + Display> DutiesManager<U, S> {
     ///
     /// be a wall-clock (e.g., system time, remote server time, etc.).
     fn update(&self, epoch: Epoch) -> Result<UpdateOutcome, Error> {
-        let public_keys: Vec<PublicKey> = self.signers.iter().map(|s| s.to_public()).collect();
+        let public_keys: Vec<PublicKey> = self.signers.iter().map(Signer::to_public).collect();
         let duties = self.beacon_node.request_duties(epoch, &public_keys)?;
         {
             // If these duties were known, check to see if they're updates or identical.

validator_client/src/service.rs

@@ -31,7 +31,6 @@ use tokio::prelude::*;
 use tokio::runtime::Builder;
 use tokio::timer::Interval;
 use tokio_timer::clock::Clock;
-use types::test_utils::generate_deterministic_keypairs;
 use types::{ChainSpec, Epoch, Fork, Slot};
 
 /// A fixed amount of time after a slot to perform operations. This gives the node time to complete