Deregisters AMI, deletes snapshots and volumes based on years

cloud-janitor.py

#!/usr/bin/env python

import boto3
import os

try:
    client = boto3.client('ec2')
except Execption as e:
    print ("Unable to create ec2 client: {}".format(e))
    os.exit(1)

def region_list():
    regions = []
    for region in client.describe_regions()['Regions']:
        if region:
            regions.append(region['RegionName'])
    return regions

REGIONS = region_list()

def deregister_ami(filter_year):
    filter_val = filter_year + "*"
    print ("Deregistering ami from year: {}".format(filter_val))
    for region in REGIONS:
        ec2 = boto3.resource('ec2', region_name=region)
        images = list(ec2.images.filter(Owners=['self'], Filters=[{'Name': 'creation-date', 'Values': [filter_val]}]).all())
        for i in images:
            if i.image_id:
                print ("Deregistering ami: {} in Region: {}".format(i.image_id, region))
                ec2.Image(i.image_id).deregister()

def delete_snapshots(filter_year):

    filter_val = filter_year + "*"
    account_id = boto3.client('sts').get_caller_identity().get('Account')

    print ("Deleting snapshot from year: {}".format(filter_val))
    for region in REGIONS:
        ec2 = boto3.resource('ec2', region_name=region)
        snapshots = list(ec2.snapshots.filter(OwnerIds=[account_id], Filters=[{'Name': 'start-time', 'Values': [filter_val]}]).all())

        for i in snapshots:
            if i.snapshot_id:
                print("Deleting snapshot: {} in Region: {}".format(i.snapshot_id, region))
                ec2.Snapshot(i.snapshot_id).delete()

def delete_volume(filter_year):
    filter_val = filter_year + "*"

    print ("Deleting volume from year: {}".format(filter_val))
    for region in REGIONS:
        ec2 = boto3.resource('ec2', region_name=region)
        volumes = list(ec2.volumes.filter(Filters=[{'Name': 'create-time', 'Values': [filter_val]}]).all())

        for i in volumes:
            if i.volume_id:
                print("Deleting volume: {} in region: {}".format(i.volume_id, region))
                ec2.Volume(i.volume_id).delete()

if __name__ == "__main__":
    for years in ['2015','2016','2017']:
        deregister_ami(years)
        delete_snapshots(years)
        delete_volume(years)