Use hashbrown hashmap directly for faster hash (ahash)

aquatic/Cargo.toml

@@ -15,6 +15,7 @@ name = "aquatic"
 bittorrent_udp = { path = "../bittorrent_udp" }
 cli_helpers = { path = "../cli_helpers" }
 crossbeam-channel = "0.4"
+hashbrown = "0.7"
 histogram = "0.6"
 indexmap = "1"
 mimalloc = { version = "0.1", default-features = false }

aquatic/src/lib/common.rs

@@ -1,10 +1,10 @@
-use std::collections::HashMap;
 use std::net::{SocketAddr, IpAddr};
 use std::sync::{Arc, atomic::AtomicUsize};
 use std::time::Instant;
 
-use parking_lot::Mutex;
+use hashbrown::HashMap;
 use indexmap::IndexMap;
+use parking_lot::Mutex;
 
 pub use bittorrent_udp::types::*;
 

aquatic/src/lib/handlers.rs

@@ -3,7 +3,7 @@ use std::sync::atomic::Ordering;
 use std::time::{Duration, Instant};
 use std::vec::Drain;
 
-use parking_lot::{Mutex, MutexGuard};
+use parking_lot::MutexGuard;
 use crossbeam_channel::{Sender, Receiver};
 use rand::{SeedableRng, Rng, rngs::{SmallRng, StdRng}};