Debug Apollo Server as AWS Lambda Function

Question

I followed the directions at Apollo Server for deploying as AWS lambda. https://www.apollographql.com/docs/apollo-server/deployment/lambda/ used the serverless framework and it is working fine in region east-2.

I extended the example to use a PostGres DB for queries (I used the npm sequalize package). The same code is used fine when I run as an ApolloServer and a local postresql DB. I made it so that it can also switch to an apollo-server-lambda. I have an if statement that changes the connection to the DB depending on if it is a lambda or not.

The issue I have is that queries that do not hit the DB work fine. But graphql queries to the DB return:

{
  "error": {
    "message": "Internal server error"
  }
}

OK, So now how do I debug a nodejs lambda function?

The lambda management console does have a test operation. I redefiend the hello world test to use this as the test:

{
  "operationName": null,
  "variables": {},
  "query": "{users {id firstName lastName addressNumber streetName city email createdAt updatedAt }}"
}

But that does not seem to be the right way to invoke the lambda function. Because the log returns:

{
  "body": "Apollo Server supports only GET/POST requests.",
  "statusCode": 405,
  "headers": {
    "Allow": "GET, POST"
  }
}

server.js

const { ApolloServer } = require('apollo-server')
const { ApolloServer: ApolloServerLambda } = require('apollo-server-lambda')
const { typeDefs, resolvers, connect } = require('./schema.js')

// The ApolloServer constructor requires two parameters: your schema
// definition and your set of resolvers.

async function setup(server) {
  let { url } = await server.listen()
  console.log(`🚀  Server ready at ${url}`)
  await connect("local")
}

async function awsSetup() {
  await connect("aws")
}

if (process.env.USERNAME == 'ysg4206') {
  const server = new ApolloServer({ typeDefs, resolvers })
  setup(server)
} else {
  const server = new ApolloServerLambda({ typeDefs, resolvers })
  //awsSetup()
  exports.graphqlHandler = server.createHandler({
    playground: true,
    introspection: true,
    cors: {
      origin: '*',
      credentials: true,
    },
    context: ({ event, context }) => { return (
      {
        headers: event.headers,
        functionName: context.functionName,
        event,
        context
      })
    }
  })
}

schema.js

const { gql } = require('apollo-server')
const { DB } = require('./db')
const { GraphQLDateTime } = require('graphql-iso-date')

exports.typeDefs = gql`
  scalar DateTime

  type User {
    id: Int
    "English First Name"
    firstName: String
    lastName: String
    addressNumber: Int
    streetName: String
    city: String
    email: String
    createdAt: DateTime
    updatedAt: DateTime
  }

  input UserType {
    "Hebrew First Name"
    firstName: String
    lastName: String
    addressNumber: Int
    streetName: String
    city: String
    email: String
  }

  type Query {
    users: [User]
    findUser(firstName: String): User
    hello(reply: String): String
  }

  type Mutation {
    addUser(user: UserType): User!
  }

  type Subscription {
    newUser: User!
  }
`

exports.resolvers = {
  Query: {
    // users: async () => {
    //   let users = await DB.findAll()
    //   return users
    // },
    users: () => DB.findAll(),
    findUser: async (_, { firstName }) => {
      let who = await DB.findFirst(firstName)
      return who
    },
    hello: (_, { reply }, context) => {
      console.log(`hello with reply ${reply}`)
      console.log(`context : ${JSON.stringify(reply, null, 4)}`)
      return reply
    }
  },
  Mutation: {
    addUser: async (_, args) => {
      let who = await DB.addUser(args.user)
      return who
    }
  }
}

exports.connect = async function connect(where) {
  await DB.dbSetup(where)
  await DB.populate()
  let users = await DB.findAll()
  console.log(users)
}

Aaron Stuyvenberg · Accepted Answer

Debugging lambda functions is hard! You can try digging through logs if they are configured through CloudWatch, but that won't always give you a workable stack trace, and it's challenging to find the exact invocation you're looking for.

Have you tried deploying with the Serverless Framework Dashboard? That will help give you a full stack trace along with your logs. You can get started by simply running the serverless command in your application root directory.

More information is available here

Full disclosure - I work for Serverless Inc. on the Serverless Framework.

Debug Apollo Server as AWS Lambda Function

server.js

schema.js

Answers (2)

Related Questions