cdk_monitoring_constructs: failed to read values from parameter store

[andreprawira]

Describe the bug

I'm trying to read values from string list parameter that was created in a different stack (the code for the other stack works and the parameter store got created) when using cdk_monitoring_constructs module. However, i keep getting this error

@jsii/kernel.RuntimeError: Error: Resolution error: Resolution error: Resolution error: Resolution error: Resolution error: Cannot add elements to list token, got: AWS/EC2,CPUUtilization,InstanceId,#{Token[TOKEN.2245]},[object Object].
  Object creation stack:
    at stack traces disabled.
  Object creation stack:
    at Execute again with CDK_DEBUG=true to capture stack traces.
  Object creation stack:
    at Execute again with CDK_DEBUG=true to capture stack traces..
      at Kernel._Kernel_ensureSync (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:10491:23)
      at Kernel.invoke (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:9855:102)
      at KernelHost.processRequest (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11696:36)
      at KernelHost.run (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11656:22)
      at Immediate._onImmediate (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11657:46)
      at process.processImmediate (node:internal/timers:476:21)

here is my code,

worker_instance_ids = ssm.StringListParameter.from_string_list_parameter_name(
            self,
            "WorkerInstanceIdsParam",
            string_list_parameter_name="worker-instance-ids",
        ).string_list_value

        consolidated_dashboard = MonitoringFacade(
            self, f"{props.prefix}-Consolidated-Dashboard"
        )
        consolidated_dashboard.monitor_ec2_instances(
            instance_ids=worker_instance_ids,
            human_readable_name="Worker Instance",
        )

Expected Behavior

The strings inside parameter store list should have been passed and consumed normally because instance_ids expect Sequence[str] and i am passing a List[str].

Current Behavior

I'm getting this error

@jsii/kernel.RuntimeError: Error: Resolution error: Resolution error: Resolution error: Resolution error: Resolution error: Cannot add elements to list token, got: AWS/EC2,CPUUtilization,InstanceId,#{Token[TOKEN.2245]},[object Object].
  Object creation stack:
    at stack traces disabled.
  Object creation stack:
    at Execute again with CDK_DEBUG=true to capture stack traces.
  Object creation stack:
    at Execute again with CDK_DEBUG=true to capture stack traces..
      at Kernel._Kernel_ensureSync (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:10491:23)
      at Kernel.invoke (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:9855:102)
      at KernelHost.processRequest (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11696:36)
      at KernelHost.run (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11656:22)
      at Immediate._onImmediate (C:\Users\ANDREP~2\AppData\Local\Temp\tmpbekmebwb\lib\program.js:11657:46)
      at process.processImmediate (node:internal/timers:476:21)

Reproduction Steps

Please read the description above

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.131.0 (build 92b912d)

Framework Version

No response

Node.js Version

v18.17.1

OS

windows

Language

Python

Language Version

3.11.1

Other information

No response

[ashishdhingra]

Hi @andreprawira,

Good morning. Thanks for reporting the issue. Per documentation for ssm::StringListParameter.from_string_list_parameter_name(), the return type of this method is IStringListParameter (not list or array of string values). It is an IStringListParameter object. Instead, IStringListParameter.string_list_value property should be used, if instance_ids in your code accept a string sequence.

Please confirm if above guidance works.

Thanks,
Ashish

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