Use FxHash in uv-auth (#6149)

Cargo.lock

@@ -4553,6 +4553,7 @@ dependencies = [
  "reqwest",
  "reqwest-middleware",
  "rust-netrc",
+ "rustc-hash 2.0.0",
  "tempfile",
  "test-log",
  "tokio",

crates/once-map/src/lib.rs

@@ -15,12 +15,19 @@ use tokio::sync::Notify;
 ///
 /// Note that this always clones the value out of the underlying map. Because
 /// of this, it's common to wrap the `V` in an `Arc<V>` to make cloning cheap.
-pub struct OnceMap<K, V, H = RandomState> {
-    items: DashMap<K, Value<V>, H>,
+pub struct OnceMap<K, V, S = RandomState> {
+    items: DashMap<K, Value<V>, S>,
 }
 
 impl<K: Eq + Hash, V: Clone, H: BuildHasher + Clone> OnceMap<K, V, H> {
-    // Create a [`OnceMap`] with the specified capacity and hasher.
+    /// Create a [`OnceMap`] with the specified hasher.
+    pub fn with_hasher(hasher: H) -> OnceMap<K, V, H> {
+        OnceMap {
+            items: DashMap::with_hasher(hasher),
+        }
+    }
+
+    /// Create a [`OnceMap`] with the specified capacity and hasher.
     pub fn with_capacity_and_hasher(capacity: usize, hasher: H) -> OnceMap<K, V, H> {
         OnceMap {
             items: DashMap::with_capacity_and_hasher(capacity, hasher),

crates/uv-auth/Cargo.toml

@@ -16,6 +16,7 @@ once-map = { workspace = true }
 reqwest = { workspace = true }
 reqwest-middleware = { workspace = true }
 rust-netrc = { workspace = true }
+rustc-hash = { workspace = true }
 tokio = { workspace = true }
 tracing = { workspace = true }
 url = { workspace = true }

crates/uv-auth/src/cache.rs

@@ -1,18 +1,23 @@
+use std::hash::BuildHasherDefault;
 use std::sync::Arc;
-use std::{collections::HashMap, sync::RwLock};
+use std::sync::RwLock;
+
+use rustc_hash::{FxHashMap, FxHasher};
+use tracing::trace;
+use url::Url;
+
+use once_map::OnceMap;
 
 use crate::credentials::{Credentials, Username};
 use crate::Realm;
 
-use once_map::OnceMap;
-use tracing::trace;
-use url::Url;
+type FxOnceMap<K, V> = OnceMap<K, V, BuildHasherDefault<FxHasher>>;
 
 pub struct CredentialsCache {
     /// A cache per realm and username
-    realms: RwLock<HashMap<(Realm, Username), Arc<Credentials>>>,
+    realms: RwLock<FxHashMap<(Realm, Username), Arc<Credentials>>>,
     /// A cache tracking the result of fetches from external services
-    pub(crate) fetches: OnceMap<(Realm, Username), Option<Arc<Credentials>>>,
+    pub(crate) fetches: FxOnceMap<(Realm, Username), Option<Arc<Credentials>>>,
     /// A cache per URL, uses a trie for efficient prefix queries.
     urls: RwLock<UrlTrie>,
 }
@@ -27,8 +32,8 @@ impl CredentialsCache {
     /// Create a new cache.
     pub fn new() -> Self {
         Self {
-            fetches: OnceMap::default(),
-            realms: RwLock::new(HashMap::new()),
+            fetches: FxOnceMap::default(),
+            realms: RwLock::new(FxHashMap::default()),
             urls: RwLock::new(UrlTrie::new()),
         }
     }

crates/uv-resolver/src/resolver/index.rs

@@ -25,17 +25,6 @@ struct SharedInMemoryIndex {
 pub(crate) type FxOnceMap<K, V> = OnceMap<K, V, BuildHasherDefault<FxHasher>>;
 
 impl InMemoryIndex {
-    /// Create an `InMemoryIndex` with pre-filled packages and distributions.
-    pub fn with(
-        packages: FxOnceMap<PackageName, Arc<VersionsResponse>>,
-        distributions: FxOnceMap<VersionId, Arc<MetadataResponse>>,
-    ) -> InMemoryIndex {
-        InMemoryIndex(Arc::new(SharedInMemoryIndex {
-            packages,
-            distributions,
-        }))
-    }
-
     /// Returns a reference to the package metadata map.
     pub fn packages(&self) -> &FxOnceMap<PackageName, Arc<VersionsResponse>> {
         &self.0.packages