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add support for Fn::Tranform in CFnV2 #12966

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add support for Fn::Tranform in CFnV2 #12966

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@pinzon pinzon commented Aug 6, 2025

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@pinzon pinzon added the semver: patch Non-breaking changes which can be included in patch releases label Aug 6, 2025
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Test Results - Preflight, Unit

22 063 tests  ±0   20 329 ✅ ±0   6m 12s ⏱️ -12s
     1 suites ±0    1 734 💤 ±0 
     1 files   ±0        0 ❌ ±0 

Results for commit 28fef89. ± Comparison against base commit c1d19e2.

♻️ This comment has been updated with latest results.

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Test Results (amd64) - Acceptance

7 tests  ±0   5 ✅ ±0   3m 13s ⏱️ -1s
1 suites ±0   2 💤 ±0 
1 files   ±0   0 ❌ ±0 

Results for commit 28fef89. ± Comparison against base commit c1d19e2.

♻️ This comment has been updated with latest results.

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Test Results (amd64) - Integration, Bootstrap

  5 files    5 suites   35m 21s ⏱️
577 tests 354 ✅ 208 💤 15 ❌
583 runs  354 ✅ 214 💤 15 ❌

For more details on these failures, see this check.

Results for commit 28fef89.

♻️ This comment has been updated with latest results.

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LocalStack Community integration with Pro

  2 files  ±    0    2 suites  ±0   25m 10s ⏱️ - 1h 19m 18s
553 tests  - 4 072  329 ✅  - 3 857  209 💤  - 230  15 ❌ +15 
555 runs   - 4 072  329 ✅  - 3 857  211 💤  - 230  15 ❌ +15 

For more details on these failures, see this check.

Results for commit 28fef89. ± Comparison against base commit c1d19e2.

This pull request removes 4072 tests. 
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_lambda_dynamodb
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_opensearch_crud
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_search_books
tests.aws.scenario.bookstore.test_bookstore.TestBookstoreApplication ‑ test_setup
tests.aws.scenario.kinesis_firehose.test_kinesis_firehose.TestKinesisFirehoseScenario ‑ test_kinesis_firehose_s3
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_destination_sns
tests.aws.scenario.lambda_destination.test_lambda_destination_scenario.TestLambdaDestinationScenario ‑ test_infra
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_prefill_dynamodb_table
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input0-SUCCEEDED]
tests.aws.scenario.loan_broker.test_loan_broker.TestLoanBrokerScenario ‑ test_stepfunctions_input_recipient_list[step_function_input1-SUCCEEDED]
…

♻️ This comment has been updated with latest results.

@pinzon pinzon force-pushed the cp/cfn/v2/transform branch from a85bc97 to aae7310 Compare August 7, 2025 19:40
simonrw
simonrw reviewed Aug 8, 2025
View reviewed changes
localstack-core/localstack/services/cloudformation/engine/v2/change_set_model.py

if intrinsic_function == FnTransform:
if scope.count(FnTransform) > 1:
raise RuntimeError("Nested Fn::Transforms are bad")
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"are bad"! I like that error message!

But seriously... let's change that before we merge

localstack-core/localstack/services/cloudformation/engine/v2/change_set_model.py
if scope.count(FnTransform) > 1:
raise RuntimeError("Nested Fn::Transforms are bad")

path = "$" + ".".join(scope.split("/")[:-1])
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I do quite like the idea of making this implementation a helper on the Scope class, e.g.

class Scope(str):
    # ...
    def to_jsonpath(self) -> str:
        return "$" + ".".join(self.split("/"))

perhaps even adding a .parent property if we know we need to traverse up the tree

class Scope(str):
    # ...
    @property
    def parent(self) -> Self:
        return Scope(self._SEPARATOR.join(self.split(self._SEPARATOR)[:-1]))

or something

@pinzon pinzon force-pushed the cp/cfn/v2/transform branch from ebe637a to 0eee9ce Compare August 8, 2025 20:54
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@dominikschubert dominikschubert Awaiting requested review from dominikschubert dominikschubert will be requested when the pull request is marked ready for review dominikschubert is a code owner

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