Fix cfg for test

Fix up cfg attributes to work on an xor basis.

Previously, the cfg(any()) attributes would cause issues when
both native-tls and tls features were enabled. Now, https functions
and enum variants will only be created when tls xor native-tls are
enabled. Additionally, a compile error has been added for when
both tls and native-tls features are enabled.

src/lib.rs

@@ -181,6 +181,12 @@ pub fn patch(path: &str) -> Request {
     request("PATCH", path)
 }
 
+// Compilation error when both tls and native-tls features are enabled
+#[cfg(all(feature = "tls", feature = "native-tls"))]
+std::compile_error!(
+    "You have both the \"tls\" and \"native-tls\" features enabled on ureq. Please disable one of these features."
+);
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/stream.rs

@@ -24,9 +24,9 @@ use crate::unit::Unit;
 #[allow(clippy::large_enum_variant)]
 pub enum Stream {
     Http(TcpStream),
-    #[cfg(feature = "tls")]
+    #[cfg(all(feature = "tls", not(feature = "native-tls")))]
     Https(rustls::StreamOwned<rustls::ClientSession, TcpStream>),
-    #[cfg(feature = "native-tls")]
+    #[cfg(all(feature = "native-tls", not(feature = "tls")))]
     Https(TlsStream<TcpStream>),
     Cursor(Cursor<Vec<u8>>),
     #[cfg(test)]
@@ -40,7 +40,10 @@ impl ::std::fmt::Debug for Stream {
             "Stream[{}]",
             match self {
                 Stream::Http(_) => "http",
-                #[cfg(any(feature = "tls", feature = "native-tls"))]
+                #[cfg(any(
+                    all(feature = "tls", not(feature = "native-tls")),
+                    all(feature = "native-tls", not(feature = "tls")),
+                ))]
                 Stream::Https(_) => "https",
                 Stream::Cursor(_) => "cursor",
                 #[cfg(test)]
@@ -81,7 +84,10 @@ impl Stream {
     pub fn is_poolable(&self) -> bool {
         match self {
             Stream::Http(_) => true,
-            #[cfg(any(feature = "tls", feature = "native-tls"))]
+            #[cfg(any(
+                all(feature = "tls", not(feature = "native-tls")),
+                all(feature = "native-tls", not(feature = "tls")),
+            ))]
             Stream::Https(_) => true,
             _ => false,
         }
@@ -100,7 +106,10 @@ impl Read for Stream {
     fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
         match self {
             Stream::Http(sock) => sock.read(buf),
-            #[cfg(any(feature = "tls", feature = "native-tls"))]
+            #[cfg(any(
+                all(feature = "tls", not(feature = "native-tls")),
+                all(feature = "native-tls", not(feature = "tls")),
+            ))]
             Stream::Https(stream) => read_https(stream, buf),
             Stream::Cursor(read) => read.read(buf),
             #[cfg(test)]
@@ -109,7 +118,7 @@ impl Read for Stream {
     }
 }
 
-#[cfg(feature = "tls")]
+#[cfg(all(feature = "tls", not(feature = "native-tls")))]
 fn read_https(
     stream: &mut StreamOwned<ClientSession, TcpStream>,
     buf: &mut [u8],
@@ -121,11 +130,8 @@ fn read_https(
     }
 }
 
-#[cfg(feature = "native-tls")]
-fn read_https(
-    stream: &mut TlsStream<TcpStream>,
-    buf: &mut [u8],
-) -> IoResult<usize> {
+#[cfg(all(feature = "native-tls", not(feature = "tls")))]
+fn read_https(stream: &mut TlsStream<TcpStream>, buf: &mut [u8]) -> IoResult<usize> {
     match stream.read(buf) {
         Ok(size) => Ok(size),
         Err(ref e) if is_close_notify(e) => Ok(0),
@@ -153,7 +159,10 @@ impl Write for Stream {
     fn write(&mut self, buf: &[u8]) -> IoResult<usize> {
         match self {
             Stream::Http(sock) => sock.write(buf),
-            #[cfg(any(feature = "tls", feature = "native-tls"))]
+            #[cfg(any(
+                all(feature = "tls", not(feature = "native-tls")),
+                all(feature = "native-tls", not(feature = "tls")),
+            ))]
             Stream::Https(stream) => stream.write(buf),
             Stream::Cursor(_) => panic!("Write to read only stream"),
             #[cfg(test)]
@@ -163,7 +172,10 @@ impl Write for Stream {
     fn flush(&mut self) -> IoResult<()> {
         match self {
             Stream::Http(sock) => sock.flush(),
-            #[cfg(any(feature = "tls", feature = "native-tls"))]
+            #[cfg(any(
+                all(feature = "tls", not(feature = "native-tls")),
+                all(feature = "native-tls", not(feature = "tls")),
+            ))]
             Stream::Https(stream) => stream.flush(),
             Stream::Cursor(_) => panic!("Flush read only stream"),
             #[cfg(test)]
@@ -194,7 +206,7 @@ fn configure_certs(config: &mut rustls::ClientConfig) {
         .add_server_trust_anchors(&webpki_roots::TLS_SERVER_ROOTS);
 }
 
-#[cfg(feature = "tls")]
+#[cfg(all(feature = "tls", not(feature = "native-tls")))]
 pub(crate) fn connect_https(unit: &Unit) -> Result<Stream, Error> {
     use lazy_static::lazy_static;
     use std::sync::Arc;
@@ -223,7 +235,7 @@ pub(crate) fn connect_https(unit: &Unit) -> Result<Stream, Error> {
     Ok(Stream::Https(stream))
 }
 
-#[cfg(feature = "native-tls")]
+#[cfg(all(feature = "native-tls", not(feature = "tls")))]
 pub(crate) fn connect_https(unit: &Unit) -> Result<Stream, Error> {
     let hostname = unit.url.host_str().unwrap();
     let port = unit.url.port().unwrap_or(443);

src/unit.rs

@@ -10,7 +10,12 @@ use cookie::{Cookie, CookieJar};
 use crate::agent::AgentState;
 use crate::body::{self, Payload, SizedReader};
 use crate::header;
-use crate::stream::{self, connect_https, connect_test, Stream};
+#[cfg(any(
+    all(feature = "tls", not(feature = "native-tls")),
+    all(feature = "native-tls", not(feature = "tls")),
+))]
+use crate::stream::connect_https;
+use crate::stream::{self, connect_test, Stream};
 use crate::Proxy;
 use crate::{Error, Header, Request, Response};
 
@@ -286,6 +291,10 @@ fn connect_socket(unit: &Unit, use_pooled: bool) -> Result<(Stream, bool), Error
     }
     let stream = match unit.url.scheme() {
         "http" => stream::connect_http(&unit),
+        #[cfg(any(
+            all(feature = "tls", not(feature = "native-tls")),
+            all(feature = "native-tls", not(feature = "tls")),
+        ))]
         "https" => connect_https(&unit),
         "test" => connect_test(&unit),
         _ => Err(Error::UnknownScheme(unit.url.scheme().to_string())),

tests/https-agent.rs

@@ -1,7 +1,8 @@
 #[cfg(all(test, any(feature = "tls", feature = "native-tls")))]
 use std::io::Read;
 
-#[cfg(all(test, any(feature = "tls", feature = "native-tls")))]
+#[cfg(any(feature = "tls", feature = "native-tls"))]
+#[test]
 fn tls_connection_close() {
     let agent = ureq::Agent::default().build();
     let resp = agent