Discover the power of Apollo GraphQL: Simplifying the process of fetching and consolidating frontend responses

Is it possible to access the complete response on the server before returning it to the frontend?

I have tried extracting this information from the top-level resolver query (waiting after retrieving the sub-graphs) but it seems that the sub-graph objects are not being populated properly (only showing the ID).

export const resolvers = {
    Query: {
        sifKeysDeep: async (_, { clientId, ids, state }, { dataSources }) => {
            // I expected an await here to provide the aggregate result, but it doesn't
            return dataSources.sifAPI.getKeysDeepById(clientId, ids, state);
        }

export const SifKeyDeep = `#graphql
  type SifKeyDeep {
    ...
    G0: SifOpt // Instead of getting the object from the top query, I only receive the ID

Is there a server-side hook that enables me to access the fully loaded query (aggregate) result before sending it to the client?

I want to store the final result in my memory cache.

As I am new to GraphQL, my terminology may be incorrect. Please let me know so I can clarify.

typescriptgraphqlapollo-server

Answer №1

I successfully resolved this issue by creating a custom plugin that listens for the event willSendResponse.

const willSendResponsePlugin = {
async requestDidStart(requestContext) {
  console.log('Request started!');
  return {
    async willSendResponse(context: GraphQLRequestContext<BaseContext>) {
        if (context.response.body.kind == "single") {
            if (context.response.body.singleResult.data) {
                const data = context.response.body.singleResult.data;
                console.log(data);
            }
        }
    },
    async willSendSubsequentPayload(context) {
        console.log(`Will send subsequent payload...`);
    }
  };
},

};

To implement, simply include the following in your ApolloServer setup under plugins:

const server = new ApolloServer({
    ...
    plugins: [willSendResponsePlugin]

This allows you to intercept events just before they are sent back to the client.

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