cfn2ts: some property types are parsed as interfaces instead of structs

Using the python cdk, attempting to create a Web ACL with an IP whitelisting rule, but found that creating Web ACL rule properties does not work when trying to define an IP Set. I receive an error stating: TypeError: Protocols cannot be instantiated

Reproduction Steps

       # Working rule prop, with aws managed rule group
       rule_sql = wafv2.CfnWebACL.RuleProperty(
            name='AWS-AWSManagedRulesSQLRuleSet',
            statement=wafv2.CfnWebACL.StatementOneProperty(
                managed_rule_group_statement=wafv2.CfnWebACL.ManagedRuleGroupStatementProperty(
                    vendor_name='AWS',
                    name='AWSManagedRulesSQLRuleSet'
                )
            ),
            visibility_config=wafv2.CfnWebACL.VisibilityConfigProperty(
                sampled_requests_enabled=True,
                cloud_watch_metrics_enabled=True,
                metric_name='AWS-AWSManagedRulesSQLRuleSet'
            ),
            priority=0,
        )

        # Non-working rule prop, with IP set reference
        rule_ip = wafv2.CfnWebACL.RuleProperty(
            name='IPRule',
            statement=wafv2.CfnWebACL.StatementOneProperty(
                ip_set_reference_statement=wafv2.CfnWebACL.IPSetReferenceStatementProperty(
                    arn='myArn'
                )
            ),
            visibility_config=wafv2.CfnWebACL.VisibilityConfigProperty(
                sampled_requests_enabled=True,
                cloud_watch_metrics_enabled=True,
                metric_name='IPRule'
            ),
            priority=0,
        )

Error Log

When synthing templates, this error is received:

File “…\infra\cdk.env\lib\site-packages\jsii_runtime.py”, line 66, in call inst = super().call(*args, **kwargs) File “…\infra\cdk\stacks\stacks_lib\static_site_hosting.py”, line 56, in init arn=‘myArn’ File “…\infra\cdk.env\lib\site-packages\typing_extensions.py”, line 1545, in _no_init raise TypeError(‘Protocols cannot be instantiated’) TypeError: Protocols cannot be instantiated

Environment

• CLI Version :
• Framework Version: 1.27
• OS : Windows
• Language : Python

Other

Linked somewhat to: https://github.com/aws/aws-cdk/issues/6056

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This is 🐛 Bug Report

[KyleMuellerPFG]

As a workaround, I was able to implement the IPSetReferenceStatementProperty interface myself in python like so:

        @jsii.implements(wafv2.CfnRuleGroup.IPSetReferenceStatementProperty)
        class IPSetReferenceStatement:
            @property
            def arn(self):
                return self._arn

            @arn.setter
            def arn(self, value):
                self._arn = value

And then reference that new class instead:

        ip_set_ref_stmnt = IPSetReferenceStatement()
        ip_set_ref_stmnt.arn = whitelisted_ip_set.attr_arn

        # Non-working rule prop, with IP set reference
        whitelisted_ip_set_rule = wafv2.CfnWebACL.RuleProperty(
            name='AllowedIPsRule',
            statement=wafv2.CfnWebACL.StatementOneProperty(
                ip_set_reference_statement=ip_set_ref_stmnt
            ),
            visibility_config=wafv2.CfnWebACL.VisibilityConfigProperty(
                sampled_requests_enabled=True,
                cloud_watch_metrics_enabled=True,
                metric_name='AllowedIPsRule'
            ),
            priority=0,
        )

At which point, I am able to CDK synth the template, and it captures the proper reference to the IP Set Reference Statement.

[CarlosDomingues]

Was bitten by this today, thanks a lot @KyleMuellerPFG!