Handling multiple resource types in a single function

[vahdet]

With this library and its decorators, is it possible to map the received events to multiple functions depending on their ResourceTypes?

For instance. I imagine multiple function definitions annotated with @helper.create and make CfnResource can decide which one to run depending on the resource type.

is it possible this way or in some other manner?

[jaymccon]

supporting multiple resource types with a single lambda is not supported in the library currently. You could easily create a wrapper that fans out to multiple lambdas depending on type, something like:

import boto3
import json
from crhelper import CfnResource
import logging

logger = logging.getLogger(__name__)
# Initialise the helper, all inputs are optional, this example shows the defaults
helper = CfnResource(json_logging=False, log_level='DEBUG', boto_level='CRITICAL')

try:
    HANDLER_MAP = {
        "Custom::SomeType": "SomeType-function",
        "Custom::SomeOtherType": "SomeOtherType-function"
    }
    lambda_client = boto3.client('lambda')
except Exception as e:
    helper.init_failure(e)


@helper.create
@helper.update
@helper.delete
def handler(event, context):
    func_name = HANDLER_MAP[event['ResourceType']]
    lambda_client.invoke(FunctionName=func_name, InvocationType='Event', Payload=json.dumps(event))

crhelper can be implemented in the target functions as if they were being invoked directly by cloudformation