attempt at error handling in cover art request

src/subsonic.rs

@@ -1,5 +1,6 @@
 pub mod schema;
 
+use bytes::Bytes;
 use md5::Digest;
 use rand::Rng;
 use tracing::{event, Level};
@@ -146,6 +147,47 @@ impl Client {
         }
     }
 
+    async fn send_bytes(&self, request: reqwest::RequestBuilder) -> Result<Bytes, Error> {
+        let (sender, receiver) = async_channel::bounded(1);
+
+        let future = request.send();
+        runtime().spawn(async move {
+            async fn perform(
+                response: Result<reqwest::Response, reqwest::Error>,
+            ) -> Result<Bytes, Error> {
+                let response = response?.error_for_status()?;
+                if response.headers()[reqwest::header::CONTENT_TYPE]
+                    .to_str()
+                    .expect("bad content type")
+                    .starts_with("text/json")
+                {
+                    match response
+                        .json::<schema::SubsonicResponseOuter<()>>()
+                        .await?
+                        .subsonic_response
+                    {
+                        schema::SubsonicResponse::Failed { error } => {
+                            Err(Error::SubsonicError(error))
+                        }
+                        _ => panic!("unlimited error but no error"),
+                    }
+                } else {
+                    Ok(response.bytes().await?)
+                }
+            }
+
+            sender
+                .send(perform(future.await).await)
+                .await
+                .expect("could not send cover art bytes back to the main loop");
+        });
+
+        receiver
+            .recv()
+            .await
+            .expect("could not receive cover art bytes from tokio")
+    }
+
     fn url(&self, path: &[&str], query: &[(&str, &str)]) -> url::Url {
         let mut url = self.base_url.clone();
         url.path_segments_mut()
@@ -181,27 +223,9 @@ impl Client {
         self.url(&["rest", "getCoverArt"], &[("id", id)])
     }
 
-    pub async fn cover_art(&self, id: &str) -> Result<bytes::Bytes, Error> {
-        let (sender, receiver) = async_channel::bounded(1);
-
-        let future = self.client.get(self.cover_art_url(id)).send();
-        runtime().spawn(async move {
-            async fn perform(
-                response: Result<reqwest::Response, reqwest::Error>,
-            ) -> Result<bytes::Bytes, Error> {
-                Ok(response?.error_for_status()?.bytes().await?)
-            }
-
-            sender
-                .send(perform(future.await).await)
-                .await
-                .expect("could not send cover art bytes back to the main loop");
-        });
-
-        receiver
-            .recv()
+    pub async fn cover_art(&self, id: &str) -> Result<Bytes, Error> {
+        self.send_bytes(self.client.get(self.cover_art_url(id)))
             .await
-            .expect("could not receive cover art bytes from tokio")
     }
 
     pub fn stream_url(&self, id: &str) -> url::Url {