README.md

Router Simple

This example demonstrates how to compose a federated GraphQL schema from multiple remote services and run the Cosmo Router locally.

Prerequisites

• NodeJs & NPM (LTS)

Getting started

The following commands will install all dependencies, compose the federated schema, and start the Cosmo Router.

./start.sh

Finally, open the GraphQL Playground at http://localhost:3002 and run the following query:

query MyEmployees {
  employees {
    details {
      forename
    }
    currentMood
    derivedMood
    isAvailable
    notes
    products
  }
}

Advanced Request Tracing (ART)

Click on "Trace" in the right corner of the Playground to see the tracing feature in action. Advanced Request Tracing (ART) give you the ability to understand the operation execution in detail. Identify bottlenecks and optimize your queries without leaving the Playground.

Modifying the schema

In the graphql.yaml file, you can see the subgraphs that make up the federated schema. We download the schemas through their introspection endpoint and compose them into a federated schema. You can also reference a local schema file. For more information, see the wgc router compose.

For demonstration purposes, all subgraphs are running on a severless environment. The Cosmo Router is running locally and proxies the requests to the remote services. It might take a few seconds for the serverless functions to start up.