Fix some code-review issues

* Replace Redirection error with a general Http error that owns the
response
* Make the default client connect function iterative instead of
recursive
* Add a limit to the amount of redirects a client will attempt to
perform

src/client.rs

@@ -90,40 +90,60 @@ pub fn connect_with_config<Req: IntoClientRequest>(
     request: Req,
     config: Option<WebSocketConfig>,
 ) -> Result<(WebSocket<AutoStream>, Response)> {
-    let request: Request = request.into_client_request()?;
-    // Copy all the fields from the initial reqeust **except** the URI. This will be used in the event of a redirection code
-    // Have to manually clone Method because there is one field that contains a Box,
-    // but in the case of normal request methods it is Copy
-    let request2 = Request::builder()
-        .method(request.method().clone())
-        .version(request.version());
-    let uri = request.uri();
-    let mode = uri_mode(uri)?;
-    let host = request
-        .uri()
-        .host()
-        .ok_or_else(|| Error::Url("No host name in the URL".into()))?;
-    let port = uri.port_u16().unwrap_or(match mode {
-        Mode::Plain => 80,
-        Mode::Tls => 443,
-    });
-    let addrs = (host, port).to_socket_addrs()?;
-    let mut stream = connect_to_some(addrs.as_slice(), &request.uri(), mode)?;
-    NoDelay::set_nodelay(&mut stream, true)?;
-    match client_with_config(request, stream, config).map_err(|e| match e {
-        HandshakeError::Failure(f) => f,
-        HandshakeError::Interrupted(_) => panic!("Bug: blocking handshake not blocked"),
-    }) {
-        Ok(r) => Ok(r),
-        Err(e) => match e {
-            Error::Redirection(uri) =>  {
-                debug!("Redirecting to {}", uri);
-                let request = request2.uri(uri).body(()).unwrap();
-                connect_with_config(request, config)
+    let mut request: Request = request.into_client_request()?;
+
+    fn inner(request: Request, config: Option<WebSocketConfig>) -> Result<(WebSocket<AutoStream>, Response)> {
+        let uri = request.uri();
+        let mode = uri_mode(uri)?;
+        let host = request
+            .uri()
+            .host()
+            .ok_or_else(|| Error::Url("No host name in the URL".into()))?;
+        let port = uri.port_u16().unwrap_or(match mode {
+            Mode::Plain => 80,
+            Mode::Tls => 443,
+        });
+        let addrs = (host, port).to_socket_addrs()?;
+        let mut stream = connect_to_some(addrs.as_slice(), &request.uri(), mode)?;
+        NoDelay::set_nodelay(&mut stream, true)?;
+        client_with_config(request, stream, config).map_err(|e| match e{
+            HandshakeError::Failure(f) => f,
+            HandshakeError::Interrupted(_) => panic!("Bug: blocking handshake not blocked"),
+        })
+    }
+
+    let max_redirects = config.as_ref().and_then(|c| c.max_redirects).unwrap_or(0);
+    let mut redirects = 0;
+
+    loop {
+        // Copy all the fields from the initial reqeust **except** the URI. This will be used in the event of a redirection code
+        // Have to manually clone Method because there is one field that contains a Box,
+        // but in the case of normal request methods it is Copy
+        let request2 = Request::builder()
+            .method(request.method().clone())
+            .version(request.version());
+
+        match inner(request, config) {
+            Ok(r) => return Ok(r),
+            Err(e) => match e {
+                Error::Http(res) =>  {
+                    if res.status().is_redirection() {
+                        let uri = res.headers().get("Location").ok_or(Error::NoLocation)?;
+                        debug!("Redirecting to {:?}", uri);
+                        request = request2.uri(uri.to_str()?.parse::<Uri>()?).body(()).unwrap();
+                        redirects += 1;
+                        if redirects > max_redirects {
+                            return Err(Error::Http(res));
+                        }
+                    } else {
+                        return Err(Error::Http(res));
+                    }
+                }
+                _ => return Err(e),
             }
-            _ => Err(e),
         }
     }
+
 }
 
 /// Connect to the given WebSocket in blocking mode.

src/error.rs

@@ -9,7 +9,7 @@ use std::str;
 use std::string;
 
 use crate::protocol::Message;
-use http::Uri;
+use http::{Response, StatusCode};
 
 #[cfg(feature = "tls")]
 pub mod tls {
@@ -61,10 +61,12 @@ pub enum Error {
     Utf8,
     /// Invalid URL.
     Url(Cow<'static, str>),
+    /// HTTP error (status only).
+    HttpStatus(StatusCode),
     /// HTTP error.
-    Http(http::StatusCode),
-    /// HTTP 3xx redirection response
-    Redirection(Uri),
+    Http(Response<()>),
+    /// No Location header in 3xx response
+    NoLocation,
     /// HTTP format error.
     HttpFormat(http::Error),
 }
@@ -82,8 +84,9 @@ impl fmt::Display for Error {
             Error::SendQueueFull(_) => write!(f, "Send queue is full"),
             Error::Utf8 => write!(f, "UTF-8 encoding error"),
             Error::Url(ref msg) => write!(f, "URL error: {}", msg),
-            Error::Http(code) => write!(f, "HTTP error: {}", code),
-            Error::Redirection(ref uri) => write!(f, "HTTP redirection to: {}", uri),
+            Error::NoLocation => write!(f, "No Location header specified"),
+            Error::HttpStatus(ref status) => write!(f, "HTTP error code: {}", status),
+            Error::Http(ref code) => write!(f, "HTTP error: {}", code.status()),
             Error::HttpFormat(ref err) => write!(f, "HTTP format error: {}", err),
         }
     }

src/handshake/client.rs

@@ -90,6 +90,11 @@ impl<S: Read + Write> HandshakeRole for ClientHandshake<S> {
                 result,
                 tail,
             } => {
+                // If the status code received from the server is not 101, the
+                // client handles the response per HTTP [RFC2616] procedures. (RFC 6455)
+                if result.status() != StatusCode::SWITCHING_PROTOCOLS {
+                    return Err(Error::Http(result));
+                }
                 self.verify_data.verify_response(&result)?;
                 debug!("Client handshake done.");
                 let websocket =
@@ -157,16 +162,6 @@ struct VerifyData {
 
 impl VerifyData {
     pub fn verify_response(&self, response: &Response) -> Result<()> {
-        // 1. If the status code received from the server is not 101, the
-        // client handles the response per HTTP [RFC2616] procedures. (RFC 6455)
-        if response.status() != StatusCode::SWITCHING_PROTOCOLS {
-            if response.status().is_redirection() {
-                let value = response.headers().get("Location").unwrap();
-                return Err(Error::Redirection(value.to_str()?.parse()?))
-            } else {
-                return Err(Error::Http(response.status()));
-            }
-        }
         let headers = response.headers();
 
         // 2. If the response lacks an |Upgrade| header field or the |Upgrade|

src/handshake/server.rs

@@ -274,7 +274,7 @@ impl<S: Read + Write, C: Callback> HandshakeRole for ServerHandshake<S, C> {
             StageResult::DoneWriting(stream) => {
                 if let Some(err) = self.error_code.take() {
                     debug!("Server handshake failed.");
-                    return Err(Error::Http(StatusCode::from_u16(err)?));
+                    return Err(Error::HttpStatus(StatusCode::from_u16(err)?));
                 } else {
                     debug!("Server handshake done.");
                     let websocket = WebSocket::from_raw_socket(stream, Role::Server, self.config);

src/protocol/mod.rs

@@ -43,6 +43,9 @@ pub struct WebSocketConfig {
     /// be reasonably big for all normal use-cases but small enough to prevent memory eating
     /// by a malicious user.
     pub max_frame_size: Option<usize>,
+    /// The max number of redirects the client should follow before aborting the connection.
+    /// The default value is 3. `None` here means that the client will not attempt to follow redirects.
+    pub max_redirects: Option<u8>,
 }
 
 impl Default for WebSocketConfig {
@@ -51,6 +54,7 @@ impl Default for WebSocketConfig {
             max_send_queue: None,
             max_message_size: Some(64 << 20),
             max_frame_size: Some(16 << 20),
+            max_redirects: Some(3)
         }
     }
 }