cfn-custom-resource

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cfn-custom-resource

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Collection of tools to enable use of AWS Lambda with CloudFormation

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# cfn-custom-resource

`cfn_custom_resource` provides an abstract base class to make it easier to implement
[`AWS CloudFormation custom resources`](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-custom-resources.html).
It was developed from Gene Wood's [`cfnlambda`](https://github.com/gene1wood/cfnlambda), which provides lower-level functions and decorators for the same purpose.

At its simplest, you subclass the `CloudFormationCustomResource` and implement three methods:
`create`, `update`, and `delete`, for each of the respective CloudFormation actions. Indicate failure by raising an exception. If you want attributes available on the resource within CloudFormation, return them as a dictionary. Your subclass has a class method `get_handler`, which will return a Lambda handler function.
Logging to CloudWatch is provided by the `logger` field.

```python
from cfn_custom_resource import CloudFormationCustomResource

# For resources of type Custom::MyCustomResource
class MyCustomResource(CloudFormationCustomResource):
    def create(self):
        # Implement
        # For AWS SDKs, use:
        #   self.get_boto3_client(service_name)
        #   self.get_boto3_resource(service_name)
        # Set the name of what you are creating to the value in
        #   self.physical_resource_id
        # This id is autogenerated for you, but you can set it if you want or need
        # This id is what CloudFormation uses for Ref
        # The resource properties defined in the template are in
        #   self.resource_properties
        # Attributes can be set by returning a dictionary

def update(self):
        # Implement
        # The name of what you previously created is
        #   self.physical_resource_id
        # The updated properties are in
        #   self.resource_properties
        # To check what's changed, compare with
        #   self.old_resource_properties
        # If you set attributes in create(), you need to set them here too

def delete(self):
        # implement

handler = MyCustomResource.get_handler()
```

See more details in the [wiki](https://github.com/iRobotCorporation/cfn-custom-resource/wiki)

## How to contribute
Feel free to open issues or fork and submit PRs.

* Issue Tracker: https://github.com/iRobotCorporation/cfn-custom-resource/issues
* Source Code: https://github.com/iRobotCorporation/cfn-custom-resource

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