def _construct_version(self, function, intrinsics_resolver):
        """Constructs a Lambda Version resource that will be auto-published when CodeUri of the function changes.
        Old versions will not be deleted without a direct reference from the CloudFormation template.

        :param model.lambda_.LambdaFunction function: Lambda function object that is being connected to a version
        :param model.intrinsics.resolver.IntrinsicsResolver intrinsics_resolver: Class that can help resolve
            references to parameters present in CodeUri. It is a common usecase to set S3Key of Code to be a
            template parameter. Need to resolve the values otherwise we will never detect a change in Code dict
        :return: Lambda function Version resource
        """
        code_dict = function.Code
        if not code_dict:
            raise ValueError("Lambda function code must be a valid non-empty dictionary")

        if not intrinsics_resolver:
            raise ValueError("intrinsics_resolver is required for versions creation")

        # Resolve references to template parameters before creating hash. This will *not* resolve all intrinsics
        # because we cannot resolve runtime values like Arn of a resource. For purposes of detecting changes, this
        # is good enough. Here is why:
        #
        # When using intrinsic functions there are two cases when has must change:
        #   - Value of the template parameter changes
        #   - (or) LogicalId of a referenced resource changes ie. !GetAtt NewResource.Arn
        #
        # Later case will already change the hash because some value in the Code dictionary changes. We handle the
        # first case by resolving references to template parameters. It is okay even if these references are
        # present inside another intrinsic such as !Join. The resolver will replace the reference with the parameter's
        # value and keep all other parts of !Join identical. This will still trigger a change in the hash.
        code_dict = intrinsics_resolver.resolve_parameter_refs(code_dict)

        # Construct the LogicalID of Lambda version by appending 10 characters of SHA of CodeUri. This is necessary
        # to trigger creation of a new version every time code location changes. Since logicalId changes, CloudFormation
        # will drop the old version and create a new one for us. We set a DeletionPolicy on the version resource to
        # prevent CloudFormation from actually deleting the underlying version resource
        #
        # SHA Collisions: For purposes of triggering a new update, we are concerned about just the difference previous
        #                 and next hashes. The chances that two subsequent hashes collide is fairly low.
        prefix = "{id}Version".format(id=self.logical_id)
        logical_id = logical_id_generator.LogicalIdGenerator(prefix, code_dict).gen()

        attributes = self.get_passthrough_resource_attributes()
        if attributes is None:
            attributes = {}
        attributes["DeletionPolicy"] = "Retain"

        lambda_version = LambdaVersion(logical_id=logical_id, attributes=attributes)
        lambda_version.FunctionName = function.get_runtime_attr('name')
        lambda_version.Description = self.VersionDescription

        return lambda_version
def _construct_version ( self , function , intrinsics_resolver ) : code_dict = function . Code if not code_dict : raise ValueError ( "Lambda function code must be a valid non-empty dictionary" ) if not intrinsics_resolver : raise ValueError ( "intrinsics_resolver is required for versions creation" ) code_dict = intrinsics_resolver . resolve_parameter_refs ( code_dict ) prefix = "{id}Version" . format ( id = self . logical_id ) logical_id = logical_id_generator . LogicalIdGenerator ( prefix , code_dict ) . gen ( ) attributes = self . get_passthrough_resource_attributes ( ) if attributes is None : attributes = { } attributes [ "DeletionPolicy" ] = "Retain" lambda_version = LambdaVersion ( logical_id = logical_id , attributes = attributes ) lambda_version . FunctionName = function . get_runtime_attr ( 'name' ) lambda_version . Description = self . VersionDescription return lambda_version
Constructs a Lambda Version resource that will be auto-published when CodeUri of the function changes.
        Old versions will not be deleted without a direct reference from the CloudFormation template.

        :param model.lambda_.LambdaFunction function: Lambda function object that is being connected to a version
        :param model.intrinsics.resolver.IntrinsicsResolver intrinsics_resolver: Class that can help resolve
            references to parameters present in CodeUri. It is a common usecase to set S3Key of Code to be a
            template parameter. Need to resolve the values otherwise we will never detect a change in Code dict
        :return: Lambda function Version resource