How to call AWS AppSync from lambda? - amazon-web-services

Question

I am trying to call AWS AppSync service from AWS Lambda function using IAM permissions. Just a basic mutation or query call. I found this tutorial:
https://aws.amazon.com/blogs/mobile/supporting-backend-and-internal-processes-with-aws-appsync-multiple-authorization-types/
but it no longer works with the latest sdks. Errors out on lines 3, 4, etc.
require('isomorphic-fetch');
const AWS = require('aws-sdk/global');
const AUTH_TYPE = require('aws-appsync').AUTH_TYPE;
const AWSAppSyncClient = require('aws-appsync').default;
const gql = require('graphql-tag');
const config = {
url: process.env.APPSYNC_ENDPOINT,
region: process.env.AWS_REGION,
auth: {
type: AUTH_TYPE.AWS_IAM,
credentials: AWS.config.credentials,
},
disableOffline: true
};
const createLogMutation =
`mutation createLog($input: CreateLogInput!) {
createLog(input: $input) {
id
event
detail
}
}`;
const client = new AWSAppSyncClient(config);
exports.handler = (event, context, callback) => {
// An expected payload has the following format:
// {
// "event": "sample event",
// "detail": "sample detail"
// }
const payload = event['Records'][0]["Sns"]['Message'];
if (!payload['event']) {
callback(Error("event must be provided in the message body"));
return;
}
const logDetails = {
event: payload['event'],
detail: payload['detail']
};
(async () => {
try {
const result = await client.mutate({
mutation: gql(createLogMutation),
variables: {input: logDetails}
});
console.log(result.data);
callback(null, result.data);
} catch (e) {
console.warn('Error sending mutation: ', e);
callback(Error(e));
}
})();
};
Can someone please post a basic code for calling query/mutation from lambda using IAM permissions?