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Remove an unnecessary clone in aura (#2163)

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This commit is contained in:
Wei Tang
2019-04-01 23:35:48 +02:00
committed by GitHub
parent a0e6d96de0
commit a8b5fe145f
1 changed files with 7 additions and 12 deletions
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substrate/core/consensus/aura/src/lib.rs
+7 -12
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@@ -79,9 +79,7 @@ pub trait Network: Clone {
}
/// Get slot author for given block along with authorities.
fn slot_author<P: Pair>(slot_num: u64, authorities: &[AuthorityId<P>]) -> Option<AuthorityId<P>>
where P::Public: Clone,
{
fn slot_author<P: Pair>(slot_num: u64, authorities: &[AuthorityId<P>]) -> Option<&AuthorityId<P>> {
if authorities.is_empty() { return None }
let idx = slot_num % (authorities.len() as u64);
@@ -90,10 +88,9 @@ fn slot_author<P: Pair>(slot_num: u64, authorities: &[AuthorityId<P>]) -> Option
let current_author = authorities.get(idx as usize)
.expect("authorities not empty; index constrained to list length;\
this is a valid index; qed")
.clone();
this is a valid index; qed");
Some(current_author.clone())
Some(current_author)
}
fn duration_now() -> Option<Duration> {
@@ -235,13 +232,12 @@ pub fn start_aura<B, C, E, I, P, SO, Error, OnExit>(
E::Proposer: Proposer<B, Error=Error>,
<<E::Proposer as Proposer<B>>::Create as IntoFuture>::Future: Send + 'static,
I: BlockImport<B> + Send + Sync + 'static,
Error: From<I::Error>,
P: Pair + Send + Sync + 'static,
P::Public: Hash + Eq + Send + Sync + Clone + Debug + Encode + Decode + 'static,
P::Signature: Encode,
SO: SyncOracle + Send + Sync + Clone,
DigestItemFor<B>: CompatibleDigestItem<P> + DigestItem<AuthorityId=AuthorityId<P>>,
Error: ::std::error::Error + Send + 'static + From<::consensus_common::Error>,
Error: ::std::error::Error + Send + From<::consensus_common::Error> + From<I::Error> + 'static,
OnExit: Future<Item=(), Error=()>,
{
let worker = AuraWorker {
@@ -283,10 +279,9 @@ impl<B: Block, C, E, I, P, Error, SO> SlotWorker<B> for AuraWorker<C, E, I, P, S
P: Pair + Send + Sync + 'static,
P::Public: Hash + Eq + Send + Sync + Clone + Debug + Encode + Decode + 'static,
P::Signature: Encode,
Error: From<I::Error>,
SO: SyncOracle + Send + Clone,
DigestItemFor<B>: CompatibleDigestItem<P> + DigestItem<AuthorityId=AuthorityId<P>>,
Error: ::std::error::Error + Send + 'static + From<::consensus_common::Error>,
Error: ::std::error::Error + Send + From<::consensus_common::Error> + From<I::Error> + 'static,
{
type OnSlot = Box<Future<Item=(), Error=consensus_common::Error> + Send>;
@@ -336,7 +331,7 @@ impl<B: Block, C, E, I, P, Error, SO> SlotWorker<B> for AuraWorker<C, E, I, P, S
let maybe_author = slot_author::<P>(slot_num, &authorities);
let proposal_work = match maybe_author {
None => return Box::new(future::ok(())),
Some(author) => if author == public_key {
Some(author) => if author == &public_key {
debug!(
target: "aura", "Starting authorship at slot {}; timestamp = {}",
slot_num,
@@ -449,7 +444,7 @@ fn check_header<B: Block, P: Pair>(
allow_old_seals: bool,
) -> Result<CheckedHeader<B::Header, P::Signature>, String>
where DigestItemFor<B>: CompatibleDigestItem<P>,
P::Public: Clone + AsRef<P::Public>,
P::Public: AsRef<P::Public>,
P::Signature: Decode,
{
let digest_item = match header.digest_mut().pop() {