I'm currently working on a POC to implement Apollo Federation gateway in and NodeJS + express application. Up until now, I haven't really encountered any example on how to properly do it.
So far, I encounter a problem where the ApolloServer module doesn't recognize an instance of ApolloGateway from @apollo/gateway. I'm using ApolloServer instance as a wrapper of the gateway's instance as shown from the tutorial: https://www.apollographql.com/docs/apollo-server/federation/implementing/#defining-the-gateway. However, I ran into a problem when calling the server.applyMiddleWare() in my express app. I came across the example from https://github.com/apollographql/apollo-server/tree/master/packages/apollo-server-express#express
to be specific here is a snippet of the error log:
$ node --use_strict ./bin/www
/Users/evanlee/dev/federation-gateway/node_modules/loglevel-debug/index.js:32
target[k] = attr.bind ? attr.bind(k) : attr;
^
TypeError: Cannot assign to read only property 'name' of function 'function() {
return log.debug.apply(this, arguments);
}'
at /Users/evanlee/dev/federation-gateway/node_modules/loglevel-debug/index.js:32:15
at Array.forEach (<anonymous>)
at composit (/Users/evanlee/dev/federation-gateway/node_modules/loglevel-debug/index.js:30:20)
at Object.loglevelDebug [as default] (/Users/evanlee/dev/federation-gateway/node_modules/loglevel-debug/index.js:201:3)
at new ApolloGateway (/Users/evanlee/dev/federation-gateway/node_modules/@apollo/gateway/dist/index.js:101:33)
at Object.<anonymous> (/Users/evanlee/dev/federation-gateway/app.js:21:12)
at Module._compile (internal/modules/cjs/loader.js:701:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
at Module.load (internal/modules/cjs/loader.js:600:32)
at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
error Command failed with exit code 1.
and here is how I'm trying to integrate the ApolloServer to my express app:
const { ApolloServer } = require('apollo-server');
const { ApolloGateway } = require('@apollo/gateway');
const app = express();
// Apollo Server and Gateway definition
const server = new ApolloServer({
gateway: new ApolloGateway({
debug: true,
serviceList: [
{ name: 'base-app', url: 'http://localhost:4001/graphql' },
]
}),
subscriptions: false,
});
server.applyMiddleware({ app, path: '/graphql' });
really appreciate the help!
