Reports the failed resources in the last AWS CloudFormation stack operations.

report-cloudformation-stack-errors

#!/usr/bin/env python
#
# reports errors on the last stack operations
#
import sys
import boto3


def report_errors(stackname):
    cfn = boto3.client('cloudformation')
    paginator = cfn.get_paginator('describe_stack_events')
    page_iterator = paginator.paginate(StackName='devapi-auth0rules')

    events = []
    paginator = cfn.get_paginator('describe_stack_events')
    page_iterator = paginator.paginate(StackName=stackname)
    for page in page_iterator:
        events.extend(page['StackEvents'])
    sorted(events, key=lambda event: event['Timestamp'], reverse=True)

    for i, event in enumerate(events):
        if event['ResourceType'] == 'AWS::CloudFormation::Stack':
            status = event['ResourceStatus']
            if status.endswith('IN_PROGRESS'):
                if status.endswith('CLEANUP_IN_PROGRESS') or status.endswith('ROLLBACK_IN_PROGRESS'):
                    continue
                else:
                    break

    for event in events[:i+1]:
        if event['ResourceStatus'].endswith('FAILED'):
            if 'ResourceStatusReason' not in event:
                sys.sterr.write('ERROR: {LogicalResourceId} {ResourceType} {ResourceStatus}\n'.format(**event))
            else:
                sys.stderr.write('ERROR: {LogicalResourceId} {ResourceType} {ResourceStatus}\n\t{ResourceStatusReason}\n'.format(**event))


if __name__ == '__main__':
    if len(sys.argv) == 2:
        report_errors(sys.argv[1])
    else:
        sys.stderr.write('Usage: report-cloudformation-stack-errors stack-name\n')