Day-18 -------> add lambda function python boto3 code

import boto3
import json

def lambda_handler(event, context):
     ec2 = boto3.client('ec2')

    try:
          snapshots = ec2.describe_snapshots(OwnerIds=['self'])['Snapshots']
          instances = ec2.describe_instances(Filters=[{'Name': 'instance-state-name', 'Values': ['running']}])['Reservations']
          active_instance_volume_ids = set()

        for reservation in instances:
            for instance in reservation['Instances']:
                for volume in instance['BlockDeviceMappings']:
                    active_instance_volume_ids.add(volume['Ebs']['VolumeId'])

        deleted_snapshots_count = 0
        for snapshot in snapshots:
            snapshot_id = snapshot['SnapshotId']
            volume_id = snapshot.get('VolumeId')
            
            if not volume_id or volume_id not in active_instance_volume_ids:
                ec2.delete_snapshot(SnapshotId=snapshot_id)
                print(f"Deleted EBS snapshot {snapshot_id} as it was not attached to any active instance or volume.")
                deleted_snapshots_count += 1

        return {
            'statusCode': 200,
            'body': f'Deleted {deleted_snapshots_count} unused EBS snapshots.'
        }
        
    except Exception as e:
        print(f"Error: {str(e)}")
        return {
            'statusCode': 500,
            'body': f'Error occurred: {str(e)}'
        }