Forward fetch error message to user

lib/retry.mjs

@@ -86,9 +86,20 @@ export const exclusive = (func, cooldown = 2000) =>
         }
         else
         {
-            pending = pending
+            pending = (async () =>
-                .then(() => sleep(cooldown))
+            {
-                .then(() => func(...args));
+                try
+                {
+                    await pending;
+                }
+                catch
+                {
+                    // Ignore errors from previous executions
+                }
+
+                await sleep(cooldown);
+                return func(...args);
+            })();
         }
 
         return pending;

routes/mazes.mjs

@@ -54,7 +54,7 @@ ${cache[videoId][1]}…`);
         }
         else if (cache[videoId][0] === statusError)
         {
-            res.status(500).send('Error');
+            res.status(500).send(`Error: ${cache[videoId][1]}`);
         }
         else
         {
@@ -86,7 +86,8 @@ ${cache[videoId][1]}…`);
         catch (err)
         {
             console.error(err);
-            cache[videoId] = [statusError];
+            console.log(`setting cache error to ${videoId}`)
+            cache[videoId] = [statusError, err.message];
         }
     }
 });