aws resize ec2 through lambda

aws resize ec2 through lambda

import boto3
import json
import os
import logging

region = ''
region = os.environ['region'];
if not region :
    logger.error('Missing region');
    raise

ec2 = boto3.client('ec2', region_name=region)
logger = logging.getLogger()
logger.setLevel(logging.INFO)

def lambda_handler(event, context):
    stopped=0;
    logger.info("Event Object");
    logger.info(json.dumps(event));
    
    instance_id = event['detail']['instance-id'];
    instance_type = event['detail']['instance-type'];
    logger.info("Instance Id : %s", instance_id);
    logger.info("Instance Type : %s", instance_type);
   
    
    ## check for ec2 resource state
    ec2 = boto3.client('ec2', region);
    response = ec2.describe_instance_status(InstanceIds=[instance_id]);
    logger.info("Instance Detail");
    print(logger.info(json. dumps(response)));
    try :
        instance_state = response['InstanceStatuses'][0]['InstanceState']['Name'];
        logger.info("Instance State : %s", instance_state);
        ### do the resize if instance is running , no for stopeed instance
        if instance_state == 'running':
            ec2.stop_instances(InstanceIds=[instance_id]);
            stopped =1;
            waiter=ec2.get_waiter('instance_stopped');
            waiter.wait(InstanceIds=[instance_id]);
            print ("Stopped :  %s", instance_id);
            ## change the instance type
            ec2.modify_instance_attribute(InstanceId=instance_id, Attribute='instanceType', Value=instance_type)
            print (instance_id, " resized  to ", instance_type);
            ## modified then start the instance
            logger.info("Starting Instance ");
            ## start instance
            responses = ec2.start_instances(
                InstanceIds=[instance_id]
                );
            logger.info("Instance  Started.");    
        else :
            logger.info("Instance Not running");
            raise
    except IndexError:
        logger.info("Instance is not running state ");
        return 0;
    except :
        ## check if we stopped the instance
        if stopped :
             ## starting the instance which we stopped 
            responses = ec2.start_instances(
                InstanceIds=[instance_id]
                );    
        
       
    return 1;
    

example input

event : 

{
  "detail": {
    "instance-id": "i-06eef1aa6eba41194",
    "instance-type": "t2.small"
  }
}

environment vairable :

region