Serveless GraphQL using Typescript deployed to AWS Lambda

This is a repo making use of Apollo Federation to architect distributed GraphQL microservices on Lambdas.

Main dependencies

1. apollo-server-lambda - used to build GraphQL server on Lambda
2. apollo/gateway - used to create a main entry point connecting the distributed GraphQL microservices into one
3. serverless - used to deploy resources to AWS Lambda through CloudFormation
4. typescript - used because... well, it's typescript!

Apollo Federation Concerns

1. graphql gateway calls X child graphql service when query from client only needs data from Z child graphql service. This is bad because of lambda cold starts. It means that EVERY graphql service will need to NOT have any cold starts for optimial perfomance.
   • possible solution: Try to pass the gateway a local schema but call the remote qraphql child service when querying a field it needs
   • open issue: apollographql/apollo-feature-requests#143
2. (probably answer to above) graphql gateway needs to call ALL child services to merge their schemas BEFORE letting it lets client make any queries at all. This is will be an issue when connecting a lot of child services. Especilly when only wanting to perform simple queries from 1 child service.
   • this is actually probably not an issue since schemas from child services are all fetched in parallel