Ramsriu aws organizations policy

[ramsriu]

Title: Implement idempotency for policy creation in CreateHandler

Description:
This pull request implements idempotency for policy creation in the CreateHandler. The changes ensure that attempting to create a policy that already exists results in an appropriate error response rather than attempting to create a duplicate policy.

Key Changes:

1. Modified CreateHandler to check for existing policies before attempting creation.
2. Updated handleRequest method to return an AlreadyExists error when a policy with the same name is found.
3. Implemented a new checkIfPolicyExists method to perform the existence check.
4. Updated CallbackContext to track the pre-existence check and policy creation status.
5. Refactored unit tests to align with the new idempotent behavior.

Specific Updates:

• In CreateHandler:

  • Added checkIfPolicyExists method to query existing policies.
  • Updated handleRequest to use checkIfPolicyExists and handle already existing policies.
  • Modified error handling to return appropriate error codes and messages.

• In CreateHandlerTest:

  • Updated test cases to verify idempotent behavior.
  • Added new test case for policy already exists scenario.
  • Modified existing test cases to account for the new flow.

• In CallbackContext:

  • Added isPreExistenceCheckComplete and isDidResourceAlreadyExist flags.

These changes improve the robustness of the CreateHandler by preventing duplicate policy creation and providing clear feedback when a policy already exists. The implementation maintains backwards compatibility while enhancing the overall functionality of the resource provider.

Testing:

• All existing unit tests have been updated and pass.
• New unit tests have been added to cover the idempotency scenarios.
• Manual testing has been performed to ensure correct behavior in various scenarios.