Use try/catch and reauth to handle token expiration

reddit_query.m

@@ -33,7 +33,17 @@ function resp = reddit_query(endpoint, tokenObj)
                       'Timeout',60,...
                       'HeaderFields',headers);
     
+    try
         resp = webread(url, opts);
+    catch me
+        getAuthToken(tokenObj);
+        headers = {'Authorization', sprintf('%s %s', tokenObj.TokenType, tokenObj.AccessToken)};
+    
+        opts = weboptions('UserAgent',tokenObj.UserAgent,...
+                          'Timeout',60,...
+                          'HeaderFields',headers);
+        resp = webread(url, opts);
+    end
     
     % Manually reset rate-limits to avoid overloading since matlab doesn't
     % support headers