Apollo Server 2.0: AWS Lambda Integration

[alessiodionisi]

AWS Lambda integration for Apollo Server 2

Demo: https://4z36935dne.execute-api.eu-west-1.amazonaws.com/production

[evans]

@adnsio This is so awesome! Thank you so much for adding in Lambda support. With a couple of changes, we'll be able to include it in the next release.

Can we add some documentation to the README? An example of how to use it with SAM would be great. We can definitely pull from this section in the current README. The first code snippet could be replaced by this:

// graphql.js
const { ApolloServer, gql } = require('apollo-server-lambda')

const typeDefs = gql`
type Query {
  hello: String
}
`
const resolvers = {
  Query: {
     hello: () => 'hello world'
  }
}

const server = new ApolloServer({ typeDefs, resolvers })

exports.graphqlHandler = server.createHandler();

Tests would also be incredible. For now, we can just change the current test file on master to use the new API. It will provide a minimal smoke test, so more testing would be much appreciated.

Can't wait for this to land!

[evans]

Let's call this createHandler, since it's more in line with the SAM configuration.

We also have a great opportunity to make the functionality much more streamline. Can we add a cors option. We can set it up like this: https://github.com/apollographql/apollo-server/tree/master/packages/apollo-server-lambda#modifying-the-lambda-response-enable-cors

[alessiodionisi]

I renamed the function to createHandler, now it returns a function that accepts event, context and callback (the handler).

[alessiodionisi]

About CORS for now I copied the old readme example, but we could also add a cors option to simplify the setup.

[alessiodionisi]

@evans I added the examples in the readme similar to the previous ones.

[evans]

@adnsio Thank you so much for the documentation! I think your comment is spot on. A cors option passed to the createHandler that follows the express version would be great! The origin option can probably be a simple string or boolean.

[alessiodionisi]

@evans I added the CORS option (like express) and tests for lambdaApollo.ts

[evans]

Super awesome work @adnsio! Thank you @bwlt and @gragio for adding code reviews. I'm going to merge this now and include it in the next rc. Adding a deployment guide on Lambda, next to the Heroku page would be incredibly helpful and definitely make the package more widespread! It could just be a symlinked copy of the README

[unicodeveloper]

@evans I'd handle that 🍾 @adnsio Super thanks for this great work!