serverless

Serverless example

This example presents how to deploy graphql schema based on decapi to serverless infrastructure like AWS lambda.

Schema is very simple:

query {
  hello(name: "Bob") # will resolve to 'Hello, Bob!'
}

As schema compiled by compileSchema is regular, normal GraphQLSchema, we can simply use it with apollo-server-lambda that will handle everything.

import { SchemaRoot, Query, compileSchema } from 'decapi'
import { graphqlLambda, graphiqlLambda } from 'apollo-server-lambda'

@SchemaRoot()
class MySchema {
  @Query()
  hello(name: string): string {
    return `hello, ${name}!`
  }
}

const schema = compileSchema(MySchema)

export function graphqlHandler(event, context, callback) {
  function callbackFilter(error, output) {
    output.headers['Access-Control-Allow-Origin'] = '*'
    callback(error, output)
  }
  const handler = graphqlLambda({ schema, tracing: true })
  return handler(event, context, callbackFilter)
}

export const graphiqlHandler = graphiqlLambda({ endpointURL: '/graphql' })