hyper-rustls: add ring Rustls backend & use it by default

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ env:
   RUSTFLAGS: -Dwarnings
   RUSTDOCFLAGS: -Dwarnings
   RUST_BACKTRACE: 1
-  MSRV: 1.67.0
+  MSRV: 1.70.0
 
 jobs:
   build:
@@ -32,9 +32,6 @@ jobs:
     - run: rustup toolchain install ${{ env.MSRV }} --profile minimal
     - run: rustup override set ${{ env.MSRV }}
     - run: rustup show active-toolchain -v
-    # cargo from toolchain v1.67 doesn't choose versions based on MSRV,
-    # so we downgrade tokio because since v1.39 it requires rustc >=1.70.
-    - run: cargo update -p tokio --precise 1.38.1
     - run: cargo build
     - run: cargo build --no-default-features
     - run: cargo build --features uuid,time
@@ -60,6 +57,7 @@ jobs:
     - run: cargo clippy --all-targets --no-default-features
     - run: cargo build --all-targets --features native-tls
     - run: cargo build --all-targets --features rustls-tls
+    - run: cargo build --all-targets --features rustls-tls-aws
     - run: cargo clippy --all-targets --all-features
 
   test:

Cargo.toml

@@ -9,7 +9,8 @@ homepage = "https://clickhouse.com"
 license = "MIT OR Apache-2.0"
 readme = "README.md"
 edition = "2021"
-rust-version = "1.67.0" # update `derive/Cargo.toml` and CI if changed
+# update `derive/Cargo.toml` and CI if changed
+rust-version = "1.70.0"
 
 [lints.rust]
 rust_2018_idioms = { level = "warn", priority = -1 }
@@ -57,7 +58,8 @@ uuid = ["dep:uuid"]
 time = ["dep:time"]
 lz4 = ["dep:lz4_flex", "dep:cityhash-rs"]
 native-tls = ["dep:hyper-tls"]
-rustls-tls = ["dep:hyper-rustls"]
+rustls-tls = ["dep:hyper-rustls", "dep:rustls", "hyper-rustls?/ring"]
+rustls-tls-aws = ["dep:hyper-rustls", "dep:rustls", "hyper-rustls?/aws-lc-rs"]
 
 [dependencies]
 clickhouse-derive = { version = "0.2.0", path = "derive" }
@@ -70,15 +72,24 @@ http-body-util = "0.1.2"
 hyper = "1.4"
 hyper-util = { version = "0.1.6", features = ["client-legacy", "http1"] }
 hyper-tls = { version = "0.6.0", optional = true }
-hyper-rustls = { version = "0.27.2", features = ["webpki-roots"], optional = true }
+rustls = { version = "0.23", default-features = false, optional = true }
+hyper-rustls = { version = "0.27.2", default-features = false, features = [
+    "http1",
+    "http2",
+    "native-tokio",
+    "tls12",
+    "webpki-roots",
+], optional = true }
 url = "2.1.1"
 futures = "0.3.5"
 futures-channel = "0.3.30"
 static_assertions = "1.1"
 sealed = "0.5"
 sha-1 = { version = "0.10", optional = true }
 serde_json = { version = "1.0.68", optional = true }
-lz4_flex = { version = "0.11.3", default-features = false, features = ["std"], optional = true }
+lz4_flex = { version = "0.11.3", default-features = false, features = [
+    "std",
+], optional = true }
 cityhash-rs = { version = "=1.0.1", optional = true } # exact version for safety
 uuid = { version = "1", optional = true }
 time = { version = "0.3", optional = true }

derive/Cargo.toml

@@ -7,7 +7,8 @@ repository = "https://github.com/ClickHouse/clickhouse-rs"
 homepage = "https://clickhouse.com"
 edition = "2021"
 license = "MIT OR Apache-2.0"
-rust-version = "1.67.0" # update `Cargo.toml` and CI if changed
+# update `Cargo.toml` and CI if changed
+rust-version = "1.70.0"
 
 [lib]
 proc-macro = true

src/lib.rs

@@ -48,6 +48,19 @@ const TCP_KEEPALIVE: Duration = Duration::from_secs(60);
 // See https://github.com/ClickHouse/ClickHouse/blob/368cb74b4d222dc5472a7f2177f6bb154ebae07a/programs/server/config.xml#L201
 const POOL_IDLE_TIMEOUT: Duration = Duration::from_secs(2);
 
+#[cfg(any(feature = "rustls-tls", feature = "rustls-tls-aws"))]
+fn prepare_hyper_rustls_client(
+    connector: HttpConnector,
+    provider: impl Into<Arc<rustls::crypto::CryptoProvider>>,
+) -> hyper_rustls::HttpsConnector<HttpConnector> {
+    hyper_rustls::HttpsConnectorBuilder::new()
+        .with_provider_and_webpki_roots(provider)
+        .unwrap()
+        .https_or_http()
+        .enable_http1()
+        .wrap_connector(connector)
+}
+
 /// A client containing HTTP pool.
 #[derive(Clone)]
 pub struct Client {
@@ -70,18 +83,26 @@ impl Default for Client {
         // TODO: make configurable in `Client::builder()`.
         connector.set_keepalive(Some(TCP_KEEPALIVE));
 
-        #[cfg(any(feature = "native-tls", feature = "rustls-tls"))]
+        #[cfg(any(
+            feature = "native-tls",
+            feature = "rustls-tls",
+            feature = "rustls-tls-aws"
+        ))]
         connector.enforce_http(false);
 
-        #[cfg(all(feature = "native-tls", not(feature = "rustls-tls")))]
+        #[cfg(all(
+            feature = "native-tls",
+            not(feature = "rustls-tls"),
+            not(feature = "rustls-tls-aws")
+        ))]
         let connector = hyper_tls::HttpsConnector::new_with_connector(connector);
 
         #[cfg(feature = "rustls-tls")]
-        let connector = hyper_rustls::HttpsConnectorBuilder::new()
-            .with_webpki_roots()
-            .https_or_http()
-            .enable_http1()
-            .wrap_connector(connector);
+        let connector =
+            prepare_hyper_rustls_client(connector, rustls::crypto::ring::default_provider());
+        #[cfg(feature = "rustls-tls-aws")]
+        let connector =
+            prepare_hyper_rustls_client(connector, rustls::crypto::aws_lc_rs::default_provider());
 
         let client = HyperClient::builder(TokioExecutor::new())
             .pool_idle_timeout(POOL_IDLE_TIMEOUT)