renegoretzka/README.MD

## README.MD

      
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              README.MD
            
          
    How to access an AppSync Endpoint from a Lambda function

Setup in project

Run amplify add function and go thru the manual configuration and add access to other resources. Add API here.
Run amplify update api if you have a project already setup and configure IAM as an additional auth mode.
Setup in schema.graphql

Add the authorization as following to your type definition:
type Something
  @model
  @auth(
    rules: [
      { allow: private, provider: iam }
    ]
  ) {
  id: ID!
  something: String
}

This allows Lambda to fetch from this type.
Setup in lambda


Open the terminal in the amplify/backend/function/(nameOfYourFunction)/src directory in your newly created Lambda function.
Run npm install appsync-client graphql-tag

Change the code as you find in this gist's JavaScript file.
When you are done setting up your Lambda function to your desired result run amplify push to push your Lambda function to the AWS Cloud.

  
## graphql.js
exports.getSomething = /* GraphQL */ `
  query GetSomething($id: ID!) {
    getSomething(id: $id) {
      id
      someField
    }
  }
`;

## index.js
/* Amplify Params - DO NOT EDIT
  * Note: This will be auto generated for you by the CLI!
	API_APINAME_GRAPHQLAPIENDPOINTOUTPUT
	API_APINAME_GRAPHQLAPIIDOUTPUT
	ENV
	REGION
Amplify Params - DO NOT EDIT */

const AppSyncClient = require('appsync-client').default
const gql = require('graphql-tag')
const config = {
  apiUrl: process.env.API_APINAME_GRAPHQLAPIENDPOINTOUTPUT // Change the GraphQL Endpoint to your environment, which you can find in the Amplify Params
}
const client = new AppSyncClient(config)

const { getSomething } = require("./graphql.js"); // graphql.js exports the GraphQL query

const querySomething = async (id) => { // Example function
  try {
    const result = await client.request({
      query: gql(getSomething), // use your graphql query here
      variables: {
        input: {
          id
        }
      }
    })
    return result.getSomething;
  } catch (error) {
    console.log("Something went wrong in the querySomething function:", error)
  }
}

exports.handler = async (event) => {
  try {
    return await querySomething("someRandomId"); // You can also use the arguments / input from the event.
  } catch (error) {
    console.log("Something went wrong in the handler:", error)
  }
}
	exports.getSomething = /* GraphQL */ `
	query GetSomething($id: ID!) {
	getSomething(id: $id) {
	id
	someField
	}
	}
	`;
	/* Amplify Params - DO NOT EDIT
	* Note: This will be auto generated for you by the CLI!
	API_APINAME_GRAPHQLAPIENDPOINTOUTPUT
	API_APINAME_GRAPHQLAPIIDOUTPUT
	ENV
	REGION
	Amplify Params - DO NOT EDIT */

	const AppSyncClient = require('appsync-client').default
	const gql = require('graphql-tag')
	const config = {
	apiUrl: process.env.API_APINAME_GRAPHQLAPIENDPOINTOUTPUT // Change the GraphQL Endpoint to your environment, which you can find in the Amplify Params
	}
	const client = new AppSyncClient(config)

	const { getSomething } = require("./graphql.js"); // graphql.js exports the GraphQL query

	const querySomething = async (id) => { // Example function
	try {
	const result = await client.request({
	query: gql(getSomething), // use your graphql query here
	variables: {
	input: {
	id
	}
	}
	})
	return result.getSomething;
	} catch (error) {
	console.log("Something went wrong in the querySomething function:", error)
	}
	}

	exports.handler = async (event) => {
	try {
	return await querySomething("someRandomId"); // You can also use the arguments / input from the event.
	} catch (error) {
	console.log("Something went wrong in the handler:", error)
	}
	}