How to add redis client for caching in GraphQL resolver

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Any idea how we can write graphQL resolver so that I can cache API response in the redis and on the next call it takes data from the redis instead of hitting the backend API response ?

Here user name is unique in the API. i.e. 1. getify and 2. bradtraversy

/// Middleware Function to Check Cache
checkCache = (username) => {
  redis.get(username, (err, data) => {
    if (err) {
      console.log("====111111111111==========");
      console.log(err);

    }
    if (data !== null) {
      personInfo = data;
      // console.log(data);
      console.log("============222222222222=========");
      return personInfo;
    } 
  });
};

// Running Code 
const resolvers = {
  Query: {
   getPerson: async (_, { username }) => {
      await checkCache(username);
      console.log(username);
      if(null != personInfo) {
        console.log("=======333333333=======")
        console.log(personInfo);
        return JSON.parse(personInfo);
      }
      else {
        console.log("Fetching Data from API")
        console.log(username);
        const response = await fetch(`https://api.github.com/users/${username}`).then(response => response.json());
        redis.SETEX(username, 300, JSON.stringify(response)); 
        // console.log(response);
        return response;
      }
    }
    }

    

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