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refactor: extract compute_hash fn (#25553) 

* refactor compute_hash

* fix build
This commit is contained in:
HaoranYi 2022-05-26 08:48:34 -05:00 committed by GitHub
parent de612c25b3
commit b09faf4cee
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1 changed files with 11 additions and 5 deletions
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16
perf/src/sigverify.rs
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@ -485,17 +485,23 @@ impl Deduper {
}
}
/// Compute hash from packet data, returns (hash, bin_pos).
fn compute_hash(&self, packet: &Packet) -> (u64, usize) {
let mut hasher = AHasher::new_with_keys(self.seed.0, self.seed.1);
hasher.write(packet.data());
let h = hasher.finish();
let len = self.filter.len();
let pos = (usize::try_from(h).unwrap()).wrapping_rem(len);
(h, pos)
}
// Deduplicates packets and returns 1 if packet is to be discarded. Else, 0.
fn dedup_packet(&self, packet: &mut Packet) -> u64 {
// If this packet was already marked as discard, drop it
if packet.meta.discard() {
return 1;
}
let mut hasher = AHasher::new_with_keys(self.seed.0, self.seed.1);
hasher.write(packet.data());
let hash = hasher.finish();
let len = self.filter.len();
let pos = (usize::try_from(hash).unwrap()).wrapping_rem(len);
let (hash, pos) = self.compute_hash(packet);
// saturate each position with or
let prev = self.filter[pos].fetch_or(hash, Ordering::Relaxed);
if prev == u64::MAX {