Auto Tag Resources Using Lambda || Cloud Lecture 3

Lambda function makes it possible to auto tag your resources upon creation.

Code
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import json
import boto3
ec2=boto3.resource('ec2')
def lambda_handler(event, context):
print(json.dumps(event))
ids=[]
instances=[]
region=event['region']
detail=event['detail']
eventName=detail['eventName']
user_type=detail['userIdentity']['type']
arn=detail['userIdentity']['arn']
principal=detail['userIdentity']['principalId']

if user_type == 'IAMUser':
user=detail['userIdentity']['userName']
else:
user=principal.split(':')[1]

print('Region Name ' + region)
print('Event Name ' + eventName)
print('User type ' + user_type)
print('User Name ' + user)

if not detail['responseElements']:
print("ResponseElement is missing. There could be an error that occured.")
if detail['errorCode']:
print('Error Code: ' + detail['errorCode'])
if detail['errorMessage']:
print('Error Message: ' + detail['errorMessage'])
return False
else:
if eventName == 'CreateVolume':
ids.append(detail['responseElements']['volumeId'])
elif eventName == 'CreateSnapshot':
ids.append(detail['responseElements']['snapshotId'])
elif eventName == 'CreateImage':
ids.append(detail['responseElements']['imageId'])
elif eventName == 'RunInstances':
items=detail['responseElements']['instancesSet']['items']
for item in items:
ids.append(item['instanceId'])
instances.append(item['instanceId'])
base=ec2.instances.filter(InstanceIds=ids)
for inst in base:
for vol in inst.volumes.all():
ids.append(vol.id)
for eni in inst.network_interfaces:
ids.append(eni.id)
print('Instance IDs: ' + str(instances))
print('Total number of instance launched: ' + str(len(instances)))
if ids:
ec2.create_tags(Resources=ids, Tags=[
{'Key':'owner', 'Value':user},
{'Key':'PrincipalId', 'Value':principal}
])
return True