replace hashbrown with std hashmap

actix-http/Cargo.toml

@@ -64,7 +64,7 @@ derive_more = "0.99.2"
 either = "1.5.2"
 encoding_rs = "0.8"
 futures = "0.3.1"
-hashbrown = "0.6.3"
+fxhash = "0.2.1"
 h2 = "0.2.0-alpha.3"
 http = "0.1.17"
 httparse = "1.3"

actix-http/src/client/pool.rs

@@ -12,8 +12,8 @@ use actix_service::Service;
 use actix_utils::{oneshot, task::LocalWaker};
 use bytes::Bytes;
 use futures::future::{poll_fn, FutureExt, LocalBoxFuture};
+use fxhash::FxHashMap;
 use h2::client::{handshake, Connection, SendRequest};
-use hashbrown::HashMap;
 use http::uri::Authority;
 use indexmap::IndexSet;
 use slab::Slab;
@@ -66,7 +66,7 @@ where
                 acquired: 0,
                 waiters: Slab::new(),
                 waiters_queue: IndexSet::new(),
-                available: HashMap::new(),
+                available: FxHashMap::default(),
                 waker: LocalWaker::new(),
             })),
         )
@@ -259,7 +259,7 @@ pub(crate) struct Inner<Io> {
     disconnect_timeout: Option<Duration>,
     limit: usize,
     acquired: usize,
-    available: HashMap<Key, VecDeque<AvailableConnection<Io>>>,
+    available: FxHashMap<Key, VecDeque<AvailableConnection<Io>>>,
     waiters: Slab<
         Option<(
             Connect,

actix-http/src/extensions.rs

@@ -1,12 +1,12 @@
 use std::any::{Any, TypeId};
 use std::fmt;
 
-use hashbrown::HashMap;
+use fxhash::FxHashMap;
 
 #[derive(Default)]
 /// A type map of request extensions.
 pub struct Extensions {
-    map: HashMap<TypeId, Box<dyn Any>>,
+    map: FxHashMap<TypeId, Box<dyn Any>>,
 }
 
 impl Extensions {
@@ -14,7 +14,7 @@ impl Extensions {
     #[inline]
     pub fn new() -> Extensions {
         Extensions {
-            map: HashMap::default(),
+            map: FxHashMap::default(),
         }
     }
 

actix-http/src/header/map.rs

@@ -1,6 +1,7 @@
+use std::collections::hash_map::{self, Entry};
+
 use either::Either;
-use hashbrown::hash_map::{self, Entry};
-use hashbrown::HashMap;
+use fxhash::FxHashMap;
 use http::header::{HeaderName, HeaderValue};
 use http::HttpTryFrom;
 
@@ -11,7 +12,7 @@ use http::HttpTryFrom;
 /// [`HeaderName`]: struct.HeaderName.html
 #[derive(Debug, Clone)]
 pub struct HeaderMap {
-    pub(crate) inner: HashMap<HeaderName, Value>,
+    pub(crate) inner: FxHashMap<HeaderName, Value>,
 }
 
 #[derive(Debug, Clone)]
@@ -56,7 +57,7 @@ impl HeaderMap {
     /// allocate.
     pub fn new() -> Self {
         HeaderMap {
-            inner: HashMap::new(),
+            inner: FxHashMap::default(),
         }
     }
 
@@ -70,7 +71,7 @@ impl HeaderMap {
     /// More capacity than requested may be allocated.
     pub fn with_capacity(capacity: usize) -> HeaderMap {
         HeaderMap {
-            inner: HashMap::with_capacity(capacity),
+            inner: FxHashMap::with_capacity_and_hasher(capacity, Default::default()),
         }
     }