AWS ec2 start using lambda

AWS ec2 start using 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):
    logger.info("Event Object");
    logger.info(json.dumps(event));
    
    instance_id = event['detail']['instance-id'];
    logger.info("Instance Id : %s", instance_id);
    region = os.environ['region'];
    if not region :
        logger.error('Missing region');
        raise 
    
    ## 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);
       
    except IndexError:
        logger.info("Starting Instance ");
        ## start instance
        responses = ec2.start_instances(
            InstanceIds=[instance_id]
            );
       
    return 1;
    

gistfile1.txt

example test event :-

{"detail": {"instance-id": "i-031bb39695ed7172j"}}

environment variable :
region :