bug: When defining a step function alias, step function can no longer be called via base ARN #13366
Description
Is there an existing issue for this?
- I have searched the existing issues
Current Behavior
I define a step function with publish=true. Next I define an alias production that has a routing configuration that directs 100% of traffic to the latest (and only) version.
When I start the step function using the alias (<baseArn>:production), the call succeeds. When I start it using just <baseArn>, the call fails. I see the following stacktrace:
software.amazon.awssdk.services.sfn.model.SfnException: exception while calling stepfunctions.StartExecution: Traceback (most recent call last):
File "/opt/code/localstack/.venv/lib/python3.11/site-packages/rolo/gateway/chain.py", line 166, in handle
handler(self, self.context, response)
File "/opt/code/localstack/localstack-core/localstack/aws/handlers/service.py", line 113, in __call__
handler(chain, context, response)
File "/opt/code/localstack/localstack-core/localstack/aws/handlers/service.py", line 83, in __call__
skeleton_response = self.skeleton.invoke(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/code/localstack/localstack-core/localstack/aws/skeleton.py", line 154, in invoke
return self.dispatch_request(serializer, context, instance)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/code/localstack/localstack-core/localstack/aws/skeleton.py", line 168, in dispatch_request
result = handler(context, instance) or {}
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/code/localstack/localstack-core/localstack/aws/skeleton.py", line 118, in __call__
return self.fn(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/opt/code/localstack/localstack-core/localstack/services/stepfunctions/provider.py", line 825, in start_execution
state_machine_clone = copy.deepcopy(unsafe_state_machine)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 271, in _reconstruct
state = deepcopy(state, memo)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 146, in deepcopy
y = copier(x, memo)
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 265, in _reconstruct
y = func(*args)
^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 264, in <genexpr>
args = (deepcopy(arg, memo) for arg in args)
^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 146, in deepcopy
y = copier(x, memo)
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 206, in _deepcopy_list
append(deepcopy(a, memo))
^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 172, in deepcopy
y = _reconstruct(x, memo, *rv)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 271, in _reconstruct
state = deepcopy(state, memo)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 146, in deepcopy
y = copier(x, memo)
^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 231, in _deepcopy_dict
y[deepcopy(key, memo)] = deepcopy(value, memo)
^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.11/copy.py", line 161, in deepcopy
rv = reductor(4)
^^^^^^^^^^^
TypeError: cannot pickle '_thread.lock' object
Expected Behavior
Starting the step function using <baseArn> should succeed.
How are you starting LocalStack?
Custom (please describe below)
Steps To Reproduce
How are you starting localstack (e.g., bin/localstack command, arguments, or docker-compose.yml)
I'm using Java testcontainers. Resources are created using the AWS Java SDK.
Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)
Not applicable.
Environment
- OS: macOS Sequoia 15.7.1 (24G231)
- LocalStack: localstack/localstack:latest
LocalStack version: 4.6.1.dev30
LocalStack Docker image sha: sha256:b402ff0397747f33ca57206d89a813fd6f1044b4e3c7b88836ff6ede08d8e025
LocalStack build date: 2025-07-17
LocalStack build git hash: 3a47a8f10Anything else?
No response