apollo-client.ts

import { ApolloClient, HttpLink, InMemoryCache } from "@apollo/client";
import { RestLink } from "apollo-link-rest";
import { RetryLink } from "@apollo/client/link/retry";

const theGraphLink = new HttpLink({
  uri:
    process.env.NEXT_PUBLIC_SUBGRAPH_URL ??
    "https://api.thegraph.com/subgraphs/name/treppers/genesisproject"
});
const apiLink = new RestLink({
  uri: "/api",
  responseTransformer: (response) => response.json()
});

const theNFTxLink = new HttpLink({
  uri: "https://api.thegraph.com/subgraphs/name/nftx-project/nftx-v2"
});
const theSushiSwapLink = new HttpLink({
  uri: "https://api.thegraph.com/subgraphs/name/zippoxer/sushiswap-subgraph-fork"
});

const dispatcherLink = new RetryLink().split(
  (operation) => operation.getContext()?.restful,
  apiLink,
  new RetryLink().split(
    (operation) => operation.getContext()?.nftx,
    theNFTxLink,
    new RetryLink().split(
      (operation) => operation.getContext()?.sushiswap,
      theSushiSwapLink,
      theGraphLink
    )
  )
);

const client = new ApolloClient({
  cache: new InMemoryCache(),
  link: dispatcherLink
});

export default client;