Fix: Flow Handling for ABORT

[predic8]

Summary by CodeRabbit

• Bug Fixes

  • Improved error handling during response processing, including consistent abort propagation and internal server error responses.
  • Ensured cleanup continues when response processing fails or requests an abort.
  • Preserved failure details for diagnostics while limiting exception details in production responses.

• Documentation

  • Clarified request, response, and abort flow behavior, including return values and exception handling.
  • Expanded guidance for lifecycle methods and flow-specific behavior.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 59d1a4f and ea37457.

📒 Files selected for processing (1)

• core/src/main/java/com/predic8/membrane/core/interceptor/Interceptor.java

🚧 Files skipped from review as they are similar to previous changes (1)

• core/src/main/java/com/predic8/membrane/core/interceptor/Interceptor.java

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📝 Walkthrough

Walkthrough

The changes document interceptor flow semantics, implement response abort propagation and error handling in FlowController, and add tests for reverse unwinding, exceptions, applied flows, normal continuation, and production error responses.

Changes

Interceptor abort-flow handling

Layer / File(s)	Summary
Interceptor and outcome contract core/src/main/java/com/predic8/membrane/core/interceptor/Interceptor.java, core/src/main/java/com/predic8/membrane/core/interceptor/Outcome.java	Javadoc now defines request, response, and abort flows, lifecycle methods, flow selection, descriptions, and RETURN versus ABORT. Imports are explicit.
FlowController abort handling core/src/main/java/com/predic8/membrane/core/interceptor/FlowController.java	FlowController propagates response aborts, converts response exceptions into error responses, stores ABORTION_REASON, and unwinds remaining interceptors through abort handlers.
Abort-flow validation core/src/test/java/com/predic8/membrane/core/interceptor/FlowControllerTest.java	Tests verify abort order, exception handling, abort-handler failures, applied-flow behavior, normal continuation, and production error-response detail.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to ea374

The interceptor-flow documentation still misstates response and abort handling rules. Users implementing interceptors could apply the wrong lifecycle behavior, so these contract issues should be corrected before merge.

Sequence Diagram(s)

sequenceDiagram
  participant FlowController
  participant ResponseInterceptor
  participant AbortInterceptor
  FlowController->>ResponseInterceptor: handleResponse
  ResponseInterceptor-->>FlowController: ABORT or exception
  FlowController->>AbortInterceptor: handleAbort
  AbortInterceptor-->>FlowController: continue unwinding

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Poem

A rabbit checks the flow,
Response steps turn back in line,
Abort handlers hop,
Errors settle in safe bounds,
Green tests guard the path.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 41.86% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 43 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the main functional change: fixing interceptor flow handling for ABORT outcomes. It is concise and directly related to the implementation and tests.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

📝 Generate docstrings 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/outcome-flow-abort

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Actionable comments posted: 2

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Inline comments:
In `@core/src/main/java/com/predic8/membrane/core/interceptor/Interceptor.java`:
- Around line 161-164: The Interceptor.handleAbort Javadoc must qualify its
ungated-walk description as applying to request-flow abort unwinding. Also
update Outcome’s response-flow abort Javadoc to state that handling reaches only
the remaining response-capable interceptors; apply these documentation changes
at Interceptor.java lines 161-164 and Outcome.java lines 37-43, with no code
changes.
- Around line 37-38: Update the response-flow documentation in Interceptor to
state that FlowController.invokeResponseHandlers may call handleResponse on
preceding interceptors based only on handlesResponses(), including RESPONSE-only
interceptors whose handleRequest() was not executed and therefore lack
request-side state.

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Fix all unresolved CodeRabbit comments on this PR:

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Team

Run ID: 7dc88aec-782a-4ae0-81df-fb77b88dd9a9

📥 Commits

Reviewing files that changed from the base of the PR and between cfe7c76 and 9310d93.

📒 Files selected for processing (3)

• core/src/main/java/com/predic8/membrane/core/interceptor/FlowController.java
• core/src/main/java/com/predic8/membrane/core/interceptor/Interceptor.java
• core/src/main/java/com/predic8/membrane/core/interceptor/Outcome.java

Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review.