Delay Stopping AWS EC2 Instance from Lambda until User is Inactive

Question

I am using a simple AWS Lambda function to stop EC2 instances given a region and instance IDs (see python code below). The Lambda function is being triggered by an AWS CloudWatch rule (specifically a schedule everyday at 6pm). This has all been tested and works.

import boto3
def lambda_handler(event, context):
    region = event.get('region')
    instances = event.get('instances')
    ec2 = boto3.client('ec2', region_name=region)
    ec2.stop_instances(InstanceIds=instances)
    print 'started your instance: ' + str(instances)

If a user is actively logged into the EC2 instance and the function is triggered, the EC2 instance will force shutdown the instance.

So, is there a way (either in CloudWatch or Lambda) to delay and/or ignore the shutdown until either the user is inactive or totally logged out? Perhaps using boto3 code?

UPDATE:

Considered using a waiter, but the only one I could find waits until the instance is in use, as opposed to not in use. Perhaps there is a wait for that? Also considered CloudWatch alarms, which works for stopping an instance after a period of inactivity, but not for triggering at an exact time.

waiter = ec2.get_waiter('volume_in_use')
waiter.wait(
    WaiterConfig={
    'Delay': 900, # In Seconds (900 = 15 mins)
    'MaxAttempts': 47 # Number of Attempts (47 = 11.75 hours)
    }
) # Default wait is 15 seconds 40 times

Answer 1

Lambda can utilize SSM Run command to check if anyone is logged in locally before initiating the shutdown.