Apollo link which add an api directive to fetch data from multi endpoints

Why ?

We wrote an article about why and how we did this link if you want more details.

Install

   npm i @habx/apollo-multi-endpoint-link

Setup

import { createHttpLink } from "apollo-link-http";

new ApolloClient({
 link: ApolloLink.from([
   new MultiAPILink({
       endpoints: {
           housings: 'https://housings.api',
           projects: 'https://projects.api',
           ...
       },
       createHttpLink: () => createHttpLink(),
     }),
 ])
})

API

  new MultiAPILink(config, request)

config

| Parameter | Description | Default | Required | |----------------|-------------------------------------------------------------------------------------------------------------|----------------|----------| | endpoints | Dictionary of endpoints | | Yes | | createHttpLink | Function to generate http link like apollo-link-http | | Yes | | createWsLink | Function to generate wsLink like apollo-link-ws | | No | | wsSuffix | Suffix added to endpoint for subscriptions queries | /graphql/subscriptions | No | | httpSuffix | Suffix added to endpoint for http queries | /graphql | No | | getContext | Callback function called to set custom context like headers | | No |

Queries

  query projectList @api(name: projects) {
    projects {
      nodes {
        id
        name
      }
    }
  }

Setting custom context

Sometimes you might need to set custom apollo link context like headers for authentication purpose. This link allows it by doing as following.

new MultiAPILink({
    getContext: (endpoint) => {
      if (endpoint === 'yourendpoint-with-auth') {
        return ({
          headers: {
            'Authorization': 'xxxx',
          }
        })
      }
      return {}
    },
    ...
})