this is my first discussion post here. I have learned Apollo + GraphQL through Odyssey. Currently, I am building my own project using Next.js which required fetching data from 2 GraphQL endpoints.
My problem: How can I fetch data from multiple GraphQL endpoints with ApolloClient?
Below is my code for my first endpoint:
import { ApolloClient, InMemoryCache, createHttpLink } from "@apollo/client";
const client = new ApolloClient({
ssrMode: true,
link: createHttpLink({
uri: "https://api.hashnode.com/",
credentials: "same-origin",
headers: {
Authorization: process.env.HASHNODE_AUTH,
},
}),
cache: new InMemoryCache(),
});
export default client;
What you are trying to accomplish is kinda against Apollo's "One Graph" approach. Take a look at gateways and federation - https://www.apollographql.com/docs/federation/
With that being said, some hacky solution is possible but you will need to maintain a more complex structure and specify the endpoint in every query, which undermines the built-in mechanism and might cause optimization issues.
//Declare your endpoints
const endpoint1 = new HttpLink({
uri: 'https://api.hashnode.com/graphql',
...
})
const endpoint2 = new HttpLink({
uri: 'endpoint2/graphql',
...
})
//pass them to apollo-client config
const client = new ApolloClient({
link: ApolloLink.split(
operation => operation.getContext().clientName === 'endpoint2',
endpoint2, //if above
endpoint1
)
...
})
//pass client name in query/mutation
useQuery(QUERY, {variables, context: {clientName: 'endpoint2'}})
This package seems to do what you want: https://github.com/habx/apollo-multi-endpoint-link
Also, check the discussion here: https://github.com/apollographql/apollo-client/issues/84
Encourted the same problem today. I wanted to have it dynamic so here's what I've came up with:
export type DynamicLinkClientName = "aApp" | "bApp" | "graphqlApp";
type Link = RestLink | HttpLink;
type DynamicLink = { link: Link; name: DynamicLinkClientName };
const LINK_MAP: DynamicLink[] = [
{ link: aRestLink, name: "aApp" },
{ link: bAppRestLink, name: "bApp" },
{ link: graphqlAppLink, name: "graphqlApp" },
];
const isClientFromContext = (client: string) => (op: Operation) =>
op.getContext().client === client;
const DynamicApolloLink = LINK_MAP.reduce<ApolloLink | undefined>(
(prevLink, nextLink) => {
// When no name is specified, fallback to defaultLink.
if (!prevLink) {
return ApolloLink.split(
isClientFromContext(nextLink.name),
nextLink.link,
defaultLink
);
}
return ApolloLink.split(
isClientFromContext(nextLink.name),
nextLink.link,
prevLink
);
},
undefined
) as ApolloLink;