Expose and forward rustls default features

tls12 and logging are rustls features we enable by default,
as does rustls, exposing them explicitly allows users
to disable them by disabling hyper-rustls default features.

Cargo.toml

@@ -10,13 +10,13 @@ homepage = "https://github.com/ctz/hyper-rustls"
 repository = "https://github.com/ctz/hyper-rustls"
 
 [dependencies]
-log = "0.4.4"
+log = { version = "0.4.4", optional = true }
 http = "0.2"
 hyper = { version = "0.14", default-features = false, features = ["client"] }
-rustls = "0.20"
+rustls = { version = "0.20", default-features = false }
 rustls-native-certs = { version = "0.6", optional = true }
 tokio = "1.0"
-tokio-rustls = "0.23"
+tokio-rustls = { version = "0.23", default-features = false }
 webpki-roots = { version = "0.22", optional = true }
 
 [dev-dependencies]
@@ -27,12 +27,14 @@ futures-util = { version = "0.3.1", default-features = false }
 rustls-pemfile = "0.2.1"
 
 [features]
-default = ["native-tokio", "http1"]
+default = ["native-tokio", "http1", "tls12", "logging"]
 http1 = ["hyper/http1"]
 http2 = ["hyper/http2"]
 webpki-tokio = ["tokio-runtime", "webpki-roots"]
 native-tokio = ["tokio-runtime", "rustls-native-certs"]
 tokio-runtime =  ["hyper/runtime"]
+tls12 = ["tokio-rustls/tls12", "rustls/tls12"]
+logging = ["log", "tokio-rustls/logging", "rustls/logging"]
 
 [[example]]
 name = "client"

src/config.rs

@@ -21,6 +21,7 @@ pub trait ConfigBuilderExt {
 impl ConfigBuilderExt for ConfigBuilder<ClientConfig, WantsVerifier> {
     #[cfg(feature = "rustls-native-certs")]
     #[cfg_attr(docsrs, doc(cfg(feature = "rustls-native-certs")))]
+    #[cfg_attr(not(feature = "logging"), allow(unused_variables))]
     fn with_native_roots(self) -> ClientConfig {
         let mut roots = rustls::RootCertStore::empty();
         let mut valid_count = 0;
@@ -32,13 +33,13 @@ impl ConfigBuilderExt for ConfigBuilder<ClientConfig, WantsVerifier> {
             match roots.add(&cert) {
                 Ok(_) => valid_count += 1,
                 Err(err) => {
-                    log::trace!("invalid cert der {:?}", cert.0);
-                    log::debug!("certificate parsing failed: {:?}", err);
+                    crate::log::trace!("invalid cert der {:?}", cert.0);
+                    crate::log::debug!("certificate parsing failed: {:?}", err);
                     invalid_count += 1
                 }
             }
         }
-        log::debug!(
+        crate::log::debug!(
             "with_native_roots processed {} valid and {} invalid certs",
             valid_count, invalid_count
         );

src/lib.rs

@@ -34,6 +34,18 @@ mod config;
 mod connector;
 mod stream;
 
+#[cfg(feature = "logging")]
+mod log {
+    pub use log::{debug, trace};
+}
+
+#[cfg(not(feature = "logging"))]
+mod log {
+    macro_rules! trace    ( ($($tt:tt)*) => {{}} );
+    macro_rules! debug    ( ($($tt:tt)*) => {{}} );
+    pub(crate) use {debug, trace};
+}
+
 pub use crate::config::ConfigBuilderExt;
 pub use crate::connector::builder::ConnectorBuilder as HttpsConnectorBuilder;
 pub use crate::connector::HttpsConnector;