A context manager for custom resources
Project description
LBR Context Manager
The best tool for AWS lambda-backed custom resources since sliced cheese!
How is it used
I'm glad you asked!
First pip install lbr-context
, then in your custom resource handler:
from lbr_context import CfnContext
def handler(event=None, context=None):
event = event or {}
request_type = event['RequestType'].upper()
with CfnContext(event, context) as cfn:
if 'CREATE' in request_type:
# handle a create here
pass
elif 'UPDATE' in request_type:
# handle an update here
pass
elif 'DELETE' in request_type:
# handle a delete here
pass
So what makes this better
One of the big pains experienced when writing custom resources is getting it wrong, because this can cause your resource to be in an IN_PROGRESS
state for a long time.
This context manager addresses that, and will catch any uncaught exception. When it catches an exception, it sends the FAILED
request to the event
's endpoint, so CloudFormation knows your custom resource failed to create/update/delete.
On top of that, this context manager sets a timer for when the lambda is about to run out of time, so that it will make sure the FAILED
request is sent, even if your lambda's timeout is improperly configured.
Project details
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