AWS Lambda function timing out - amazon-web-services

Question

In my local mocha tests the following handler function works just fine. However, when I upload to AWS (using Serverless framework) it times out (unless you don't provide a uid parameter where it then correctly responds immediately).
What's particularly odd is that in less than 3 seconds (timeout is set at 5 seconds), the job completes and even the "post-facto" log message is output but it somehow calling the callback and that is not completing the Lambda function
Here's the cloudwatch log:
]1
And here's the handler function:
export const handler = (event: IRequestInput, context: IContext, cb: IGatewayCallback) => {
console.log('EVENT:\n', JSON.stringify(event, null, 2));
const uid = _.get(event, 'queryStringParameters.uid', undefined);
if(!uid) {
cb(null, {
statusCode: 412,
body: 'no User ID was provided by frontend'
});
return;
}
oauth.getRequestToken()
.then(token => {
console.log('Token is:\n', JSON.stringify(token, null, 2));
console.log('User ID: ', uid);
token.uid = uid;
return Promise.resolve(token);
})
.then((token) => {
console.log('URL: ', token.url);
cb(null, {
statusCode: 200,
body: token.url
});
console.log('post-facto');
})
.catch((err: PromiseError) => {
console.log('Problem in getting promise token: ', err);
cb(err.message);
});
};

Answer 1

Add the following as the first line of your handler function:
context.callbackWaitsForEmptyEventLoop = false

Answer 2

I guess that you're using lambda with "Node.js Runtime 0.10"
So you should add
context.done(null, 'Terminate Lambda');
to terminate the execution.
As the AWS lambda document, it mentions that:
The callback is supported only in the Node.js runtime v4.3. If you
are using the earlier runtime v0.10.42, you need to use the context
methods (done, succeed, and fail) to properly terminate the Lambda
function.
Please refer this link for above information