Add aborted flag to response, set when fetch is aborted

components/net/fetch/methods.rs

@@ -37,6 +37,7 @@ pub type Target<'a> = &'a mut (FetchTaskTarget + Send);
 pub enum Data {
     Payload(Vec<u8>),
     Done,
+    Cancelled,
 }
 
 pub struct FetchContext {
@@ -347,7 +348,7 @@ pub fn main_fetch(request: &mut Request,
     };
 
     // Execute deferred rebinding of response.
-    let response = if let Some(error) = internal_error {
+    let mut response = if let Some(error) = internal_error {
         Response::network_error(error)
     } else {
         response
@@ -355,9 +356,9 @@ pub fn main_fetch(request: &mut Request,
 
     // Step 19.
     let mut response_loaded = false;
-    let response = if !response.is_network_error() && !request.integrity_metadata.is_empty() {
+    let mut response = if !response.is_network_error() && !request.integrity_metadata.is_empty() {
         // Step 19.1.
-        wait_for_response(&response, target, done_chan);
+        wait_for_response(&mut response, target, done_chan);
         response_loaded = true;
 
         // Step 19.2.
@@ -376,9 +377,9 @@ pub fn main_fetch(request: &mut Request,
     if request.synchronous {
         // process_response is not supposed to be used
         // by sync fetch, but we overload it here for simplicity
-        target.process_response(&response);
+        target.process_response(&mut response);
         if !response_loaded {
-            wait_for_response(&response, target, done_chan);
+            wait_for_response(&mut response, target, done_chan);
         }
         // overloaded similarly to process_response
         target.process_response_eof(&response);
@@ -400,7 +401,7 @@ pub fn main_fetch(request: &mut Request,
 
     // Step 23.
     if !response_loaded {
-       wait_for_response(&response, target, done_chan);
+       wait_for_response(&mut response, target, done_chan);
     }
 
     // Step 24.
@@ -411,7 +412,7 @@ pub fn main_fetch(request: &mut Request,
     response
 }
 
-fn wait_for_response(response: &Response, target: Target, done_chan: &mut DoneChannel) {
+fn wait_for_response(response: &mut Response, target: Target, done_chan: &mut DoneChannel) {
     if let Some(ref ch) = *done_chan {
         loop {
             match ch.1.recv()
@@ -420,6 +421,10 @@ fn wait_for_response(response: &Response, target: Target, done_chan: &mut DoneCh
                     target.process_response_chunk(vec);
                 },
                 Data::Done => break,
+                Data::Cancelled => {
+                    response.aborted = true;
+                    break;
+                }
             }
         }
     } else {

components/net/http_loader.rs

@@ -1088,6 +1088,9 @@ fn http_network_fetch(request: &Request,
     let meta_status = meta.status.clone();
     let meta_headers = meta.headers.clone();
     let cancellation_listener = context.cancellation_listener.clone();
+    if cancellation_listener.lock().unwrap().cancelled() {
+        return Response::network_error(NetworkError::Internal("Fetch aborted".into()))
+    }
     thread::Builder::new().name(format!("fetch worker thread")).spawn(move || {
         match StreamedResponse::from_http_response(res) {
             Ok(mut res) => {
@@ -1112,7 +1115,7 @@ fn http_network_fetch(request: &Request,
                 loop {
                     if cancellation_listener.lock().unwrap().cancelled() {
                         *res_body.lock().unwrap() = ResponseBody::Done(vec![]);
-                        let _ = done_sender.send(Data::Done);
+                        let _ = done_sender.send(Data::Cancelled);
                         return;
                     }
                     match read_block(&mut res) {
@@ -1134,6 +1137,7 @@ fn http_network_fetch(request: &Request,
                             let _ = done_sender.send(Data::Done);
                             break;
                         }
+                        Ok(Data::Cancelled) => unreachable!() // read_block doesn't return Data::Cancelled
                     }
                 }
             }

components/net_traits/response.rs

@@ -112,6 +112,8 @@ pub struct Response {
     pub internal_response: Option<Box<Response>>,
     /// whether or not to try to return the internal_response when asked for actual_response
     pub return_internal: bool,
+    /// https://fetch.spec.whatwg.org/#concept-response-aborted
+    pub aborted: bool,
 }
 
 impl Response {
@@ -133,6 +135,7 @@ impl Response {
             location_url: None,
             internal_response: None,
             return_internal: true,
+            aborted: false,
         }
     }
 
@@ -162,6 +165,7 @@ impl Response {
             location_url: None,
             internal_response: None,
             return_internal: true,
+            aborted: false,
         }
     }