Created
August 4, 2022 20:23
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| #!/usr/bin/env python3 | |
| import boto3 | |
| from datetime import datetime | |
| client = boto3.client("cloudtrail") | |
| import json | |
| instances = {} | |
| def instanceIds(reponseElements): | |
| return [item["instanceId"] for item in reponseElements["instancesSet"]["items"]] | |
| for e in ( | |
| boto3.client("cloudtrail") | |
| .get_paginator("lookup_events") | |
| .paginate( | |
| LookupAttributes=[ | |
| {"AttributeKey": "ReadOnly", "AttributeValue": "false"}, | |
| {"AttributeKey": "EventSource", "AttributeValue": "ec2.amazonaws.com"}, | |
| ], | |
| PaginationConfig={"MaxItems": 1000}, | |
| ) | |
| ): | |
| for event in reversed(e.get("Events")): | |
| cloudTrailEvent = json.loads(event["CloudTrailEvent"]) | |
| print(f"-> {len(instances)} running instance(s)") | |
| match cloudTrailEvent: | |
| case { | |
| "eventSource": "ec2.amazonaws.com", | |
| "eventName": "TerminateInstances", | |
| "responseElements": responseElements, | |
| }: | |
| print(f"Terminate instance(s) {instanceIds(responseElements)}") | |
| instances = { | |
| k: v | |
| for k, v in instances.items() | |
| if k not in instanceIds(responseElements) | |
| } | |
| case { | |
| "eventSource": "ec2.amazonaws.com", | |
| "eventName": "RunInstances", | |
| "responseElements": responseElements, | |
| }: | |
| for instance in responseElements["instancesSet"]["items"]: | |
| print(f"New instance: {instance['instanceId']}") | |
| instances[instance["instanceId"]] = instance | |
| case { | |
| "eventSource": "ec2.amazonaws.com", | |
| "eventName": "CreateTags" | |
| | "SharedSnapshotVolumeCreated" | |
| | "DeleteVolume", | |
| }: | |
| pass | |
| case { | |
| "eventSource": "ec2.amazonaws.com", | |
| "readOnly": False, | |
| "eventName": unknown, | |
| }: | |
| raise ValueError(f"unknown {unknown}") |
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