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@apollo/federation

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@apollo/federation

Apollo Federation Utilities

  • 0.36.2
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
351K
increased by6.16%
Maintainers
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What is @apollo/federation?

@apollo/federation is a library that enables the composition of multiple GraphQL services into a single unified graph. It allows you to build a federated data graph, which can be composed of multiple subgraphs, each managed by different teams or services.

What are @apollo/federation's main functionalities?

Defining a Federated Schema

This code demonstrates how to define a federated schema using @apollo/federation. It includes type definitions and resolvers for a Product type, and sets up an Apollo Server with the federated schema.

const { buildFederatedSchema } = require('@apollo/federation');
const { ApolloServer, gql } = require('apollo-server');

const typeDefs = gql`
  type Product @key(fields: "id") {
    id: ID!
    name: String
  }

  extend type Query {
    product(id: ID!): Product
  }
`;

const resolvers = {
  Product: {
    __resolveReference(product) {
      return { id: product.id, name: "Sample Product" };
    }
  },
  Query: {
    product(_, { id }) {
      return { id, name: "Sample Product" };
    }
  }
};

const server = new ApolloServer({
  schema: buildFederatedSchema([{ typeDefs, resolvers }])
});

server.listen({ port: 4000 }).then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});

Extending Types Across Services

This code demonstrates how to extend types across different services using @apollo/federation. It shows how to add a reviews field to the Product type, which is defined in another service.

const { buildFederatedSchema } = require('@apollo/federation');
const { ApolloServer, gql } = require('apollo-server');

const typeDefs = gql`
  extend type Product @key(fields: "id") {
    id: ID! @external
    reviews: [Review]
  }

  type Review {
    id: ID!
    content: String
  }

  extend type Query {
    reviews(productId: ID!): [Review]
  }
`;

const resolvers = {
  Product: {
    reviews(product) {
      return [{ id: "1", content: "Great product!" }];
    }
  },
  Query: {
    reviews(_, { productId }) {
      return [{ id: "1", content: "Great product!" }];
    }
  }
};

const server = new ApolloServer({
  schema: buildFederatedSchema([{ typeDefs, resolvers }])
});

server.listen({ port: 4001 }).then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});

Gateway Setup

This code demonstrates how to set up an Apollo Gateway to compose multiple federated services into a single graph. It includes a service list with URLs for the products and reviews services.

const { ApolloServer } = require('apollo-server');
const { ApolloGateway } = require('@apollo/gateway');

const gateway = new ApolloGateway({
  serviceList: [
    { name: 'products', url: 'http://localhost:4000' },
    { name: 'reviews', url: 'http://localhost:4001' }
  ]
});

const server = new ApolloServer({
  gateway,
  subscriptions: false
});

server.listen({ port: 4002 }).then(({ url }) => {
  console.log(`🚀 Gateway ready at ${url}`);
});

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Package last updated on 25 Apr 2022

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