Cancel spot requests and stop (or terminate) EC2 instances @ 6PM EST each night.

lambda_function.py

import json
import boto3

ec2 = boto3.resource('ec2')
ec2_client = boto3.client('ec2')
    
def lambda_handler(event, context):
    
    running_instances = []
    spot_instances = []
    spot_requests = []
    
    running_filter = [
        {
            'Name': 'instance-state-name',
            'Values': ['running']
        }
    ]
    
    # get list of running instances
    instances = ec2.instances.filter(Filters=running_filter)
    
    
    # grab instance & spot request ids 
    for instance in instances:
        if instance.spot_instance_request_id:
            spot_requests.append(instance.spot_instance_request_id)
            # spot_instances.append(instance.id)
        else:
            running_instances.append(instance.id)
    
    # get spot instance requests
    requests = ec2_client.describe_spot_instance_requests(SpotInstanceRequestIds=spot_requests).get('SpotInstanceRequests')
    
    for request in requests:
        # terminate one-time spot instances and cancel their requests
        if request['Type'] == 'one-time':
            ec2_client.terminate_instances(InstanceIds=[request['InstanceId']])
            ec2_client.cancel_spot_instance_requests(SpotInstanceRequestIds=[request['SpotInstanceRequestId']])
        
        # stop persistent request spot instances
        elif request['Type'] == 'persistent':
            ec2_client.stop_instances(InstanceIds=[request['InstanceId']])
            
    # stop any on-demand instances
    for instance in running_instances:
        ec2_client.stop_instances(InstanceIds=running_instances)
     
    return {
        'statusCode': 200,
        'body': json.dumps('success')
    }