Nest.js + Apollo Studio

There are three projects inside this repo. One is the federation gateway, which is served at port http://localhost:3001/graphql the other two are the graphql node services, that are served at port http://localhost:6001/graphql and http://localhost:6002/graphql

Fetch Schema from Schema Registry in Federation Gateway (recommended)

• register account in Apollo Studio
• go to Dashboard tab and create graph

• name your graph and select supergraph

• update schema:publish cmd in package.json and APOLLO_KEY in .env.local in posts and users services

• checkout branch

git checkout schema-registry

• publish schemas

cd nest-post-service && npm install && npm run schema:publish
cd nest-user-service && npm install && npm run schema:publish

• click the operation tab in left side and update APOLLO_KEY AND APOLLO_GRAPH_REF in each .env.local file

• start 3 services

cd nest-federation-gateway && npm install && npm start
cd nest-post-service && npm install && npm start
cd nest-user-service && npm install && npm start

Build Federated Schema via Service URl in Federation Gateway

• checkout branch

git checkout build-federated-schema

• you have to start the posts and users service at first

cd nest-post-service && npm install && npm start
cd nest-user-service && npm install && npm start

• then start the federation gateway service

cd nest-federation-gateway && npm install && npm start

Comparison Between Registry and BuildFederationSchema

Feature	Schema Registry	Build Federated Schema
remove deployment dependency between gateway and graphql services	✅
federated schema will be updated in realtime if sub graph get updated (no need to redeploy gateway to update federated schema)	✅

Service Url List

service	url
gateway	http://localhost:3001/graphql
users	http://localhost:6001/graphql
posts	http://localhost:6002/graphql