Fixes after feedback

src/lib.rs

@@ -364,7 +364,7 @@ pub(crate) fn default_tls_config() -> std::sync::Arc<dyn TlsConnector> {
         fn connect(
             &self,
             _dns_name: &str,
-            _io: Box<dyn ReadWrite>,
+            _io: Box<dyn ReadWrite + Sync>,
         ) -> Result<Box<dyn ReadWrite>, crate::error::Error> {
             Err(ErrorKind::UnknownScheme
                 .msg("cannot make HTTPS request because no TLS backend is configured"))

src/ntls.rs

@@ -11,7 +11,11 @@ pub(crate) fn default_tls_config() -> std::sync::Arc<dyn TlsConnector> {
 }
 
 impl TlsConnector for native_tls::TlsConnector {
-    fn connect(&self, dns_name: &str, io: Box<dyn ReadWrite>) -> Result<Box<dyn ReadWrite>, Error> {
+    fn connect(
+        &self,
+        dns_name: &str,
+        io: Box<dyn ReadWrite + Sync>,
+    ) -> Result<Box<dyn ReadWrite>, Error> {
         let stream =
             native_tls::TlsConnector::connect(self, dns_name, io).map_err(|e| match e {
                 native_tls::HandshakeError::Failure(e) => ErrorKind::ConnectionFailed
@@ -27,7 +31,7 @@ impl TlsConnector for native_tls::TlsConnector {
 }
 
 #[cfg(feature = "native-tls")]
-impl ReadWrite for native_tls::TlsStream<Box<dyn ReadWrite>> {
+impl ReadWrite for native_tls::TlsStream<Box<dyn ReadWrite + Sync>> {
     fn socket(&self) -> Option<&TcpStream> {
         self.get_ref().socket()
     }

src/rtls.rs

@@ -1,4 +1,5 @@
 use std::convert::TryFrom;
+use std::fmt;
 use std::io::{self, Read, Write};
 use std::net::TcpStream;
 use std::sync::Arc;
@@ -26,7 +27,7 @@ fn is_close_notify(e: &std::io::Error) -> bool {
     false
 }
 
-struct RustlsStream(rustls::StreamOwned<rustls::ClientConnection, Box<dyn ReadWrite>>);
+struct RustlsStream(rustls::StreamOwned<rustls::ClientConnection, Box<dyn ReadWrite + Sync>>);
 
 impl ReadWrite for RustlsStream {
     fn socket(&self) -> Option<&TcpStream> {
@@ -96,7 +97,7 @@ impl TlsConnector for Arc<rustls::ClientConfig> {
     fn connect(
         &self,
         dns_name: &str,
-        mut io: Box<dyn ReadWrite>,
+        mut io: Box<dyn ReadWrite + Sync>,
     ) -> Result<Box<dyn ReadWrite>, Error> {
         let sni = rustls::ServerName::try_from(dns_name)
             .map_err(|e| ErrorKind::Dns.msg(format!("parsing '{}'", dns_name)).src(e))?;
@@ -125,3 +126,9 @@ pub fn default_tls_config() -> Arc<dyn TlsConnector> {
     });
     TLS_CONF.clone()
 }
+
+impl fmt::Debug for RustlsStream {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("RustlsStream").finish()
+    }
+}

src/stream.rs

@@ -18,7 +18,7 @@ use crate::error::ErrorKind;
 use crate::unit::Unit;
 
 /// Trait for things implementing [std::io::Read] + [std::io::Write]. Used in [TlsConnector].
-pub trait ReadWrite: Read + Write + Send + 'static {
+pub trait ReadWrite: Read + Write + Send + fmt::Debug + 'static {
     fn socket(&self) -> Option<&TcpStream>;
     fn is_poolable(&self) -> bool;
 
@@ -42,7 +42,7 @@ pub trait TlsConnector: Send + Sync {
     fn connect(
         &self,
         dns_name: &str,
-        io: Box<dyn ReadWrite>,
+        io: Box<dyn ReadWrite + Sync>,
     ) -> Result<Box<dyn ReadWrite>, crate::error::Error>;
 }
 
@@ -95,6 +95,12 @@ impl Write for TestStream {
     }
 }
 
+impl fmt::Debug for TestStream {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_tuple("TestStream").finish()
+    }
+}
+
 // DeadlineStream wraps a stream such that read() will return an error
 // after the provided deadline, and sets timeouts on the underlying
 // TcpStream to ensure read() doesn't block beyond the deadline.
@@ -175,7 +181,7 @@ pub(crate) fn io_err_timeout(error: String) -> io::Error {
 impl fmt::Debug for Stream {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self.inner.get_ref().socket() {
-            Some(s) => write!(f, "{:?}", s),
+            Some(_) => write!(f, "Stream({:?})", self.inner.get_ref()),
             None => write!(f, "Stream(Test)"),
         }
     }