Blogpost: Monitor your GraphQL Apollo Server in Google Cloud

books.js

// ...
const simulateDbDown = async () => {
  if (Math.random() > 0.7) {
    throw new DatabaseError('[TEST] Oh no the database is down!');
  }
};

const resolvers = {
  Query: {
    books: async (parent, args) => {
      await simulateDbDown();

      if (!args.author) {
        return exampleBooks;
      }

      return exampleBooks.filter((el) => el.author === args.author);
    }
  }
};
// ...