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"""

-*- coding: utf-8 -*-

========================

AWS Lambda

========================

Contributor: Chirag Rathod (Srce Cde)

========================

"""

import os

import sys

import traceback

import logging

import ast

import json

import boto3

logger = logging.getLogger()

logger.setLevel(logging.INFO)

# retrieve list of instance ids from ENV variable to skip stopping

INSTANCE_IDS_TO_IGNORE_STOP = ast.literal_eval(

os.environ.get("INSTANCE_IDS_TO_IGNORE_STOP", "[]")

)

def process_error() -> dict:

ex_type, ex_value, ex_traceback = sys.exc_info()

traceback_string = traceback.format_exception(ex_type, ex_value, ex_traceback)

error_msg = json.dumps(

{

"errorType": ex_type.__name__,

"errorMessage": str(ex_value),

"stackTrace": traceback_string,

}

)

return error_msg

def fetch_regions() -> list:

"""

Helper function to retrieve regions

Returns:

--------

regions: list of AWS regions

"""

ec2_client = boto3.client("ec2")

try:

regions = ec2_client.describe_regions()

except:

error_msg = process_error()

logger.error(error_msg)

return regions["Regions"]

def stop_instances(ec2_client: object, instance_ids: list) -> None:

"""

Helper function to stop the instances

Parameters:

-----------

ec2_client: boto3 region specific object

instance_ids: list of instance ids to stop

"""

try:

response = ec2_client.stop_instances(InstanceIds=instance_ids, Force=True)

except:

error_msg = process_error()

logger.error(error_msg)

def start_instances(ec2_client: object, instance_ids: list) -> None:

"""

Helper function to stop the instances

Parameters:

-----------

ec2_client: boto3 region specific object

instance_ids: list of instance ids to start

"""

try:

response = ec2_client.start_instances(InstanceIds=instance_ids)

except:

error_msg = process_error()

logger.error(error_msg)

def get_instance_ids(response: dict, STOP: bool) -> list:

"""

Parse the instance IDs from response

Parameters:

-----------

response: boto3 describe_instances response

STOP: Flag to decide type of instance Ids to fetch

Returns:

--------

instance_ids: list of instance ids to stop

"""

if STOP:

instance_ids_to_stop = []

for resp in response.get("Reservations"):

for instance in resp.get("Instances"):

if (

instance.get("State").get("Name") in ["pending", "running"]

and instance["InstanceId"] not in INSTANCE_IDS_TO_IGNORE_STOP

):

instance_ids_to_stop.append(instance["InstanceId"])

return instance_ids_to_stop

else:

instance_ids_to_start = []

for resp in response.get("Reservations"):

for instance in resp.get("Instances"):

if instance.get("State").get("Name") in ["stopped", "stopping"]:

instance_ids_to_start.append(instance["InstanceId"])

return instance_ids_to_start

def start_stop_instances_across_region(regions: list, STOP=True) -> None:

"""

Start / Stop the instances across regions

Parameters:

-----------

regions: list of regions to analyze

STOP: Flag to decide whether to start or stop the instances

"""

try:

for region in regions:

ec2_client = boto3.client("ec2", region_name=region["RegionName"])

response = ec2_client.describe_instances()

instance_ids = get_instance_ids(response, STOP)

if instance_ids and STOP:

stop_instances(ec2_client, instance_ids)

if instance_ids and not STOP:

start_instances(ec2_client, instance_ids)

while "NextToken" in response:

response = ec2_client.describe_instances(

NextToken=response["NextToken"]

)

instance_ids = get_instance_ids(response, STOP)

if instance_ids and STOP:

stop_instances(ec2_client, instance_ids)

if instance_ids and not STOP:

start_instances(ec2_client, instance_ids)

except:

error_msg = process_error()

logger.error(error_msg)

def lambda_handler(event, context):

"""

Main handler

"""

logging.info(event)

# retrieve regions

regions = fetch_regions()

try:

rule_type = event["resources"][0].split("/")[-1]

# checking which rule triggered the lambda function

if "ScheduledEC2StopRule" in rule_type:

start_stop_instances_across_region(regions, STOP=True)

if "ScheduledEC2StartRule" in rule_type:

start_stop_instances_across_region(regions, STOP=False)

except:

error_msg = process_error()

logger.error(error_msg)

return {"statusCode": 200, "body": json.dumps("Thanks from Srce Cde (Chirag)!")}