chore(rbg): migrate role.leaderWorkerSet field type from value to poi…

[Syspretor]

Ⅰ. Motivation

On the one hand, RBG lets users flexibly define the workload for each role (e.g., Deployment, StatefulSet, LeaderWorkerSet, InstanceSet). On the other hand, RBG supports both single-node replicated deployments (via role.template) and multi-node leader/worker deployments (via role.leaderWorkerSet), and will support even more flexible configurations in the future (roles.components). Therefore, we need to migrate the template and leaderWorkerSet fields to pointer types to:

• avoid default values misleading users
• facilitate validation of the role’s declared deployment shape across different workloads.

Ⅱ. Modifications

API Layer

• RoleSpec.LeaderWorkerSet -> LeaderWorkerTemplate -> *LeaderWorkerTemplate
• RoleSpec.LeaderWorkerSet.PatchLeaderTemplate runtime.RawExtension -> *runtime.RawExtension
• RoleSpec.LeaderWorkerSet.PatchWorkerTemplate runtime.RawExtension -> *runtime.RawExtension

Controller Logic:

• Handle nil LeaderWorkerSet gracefully with zero-value fallback

• Maintains backward compatibility: existing behavior unchanged

• Internal functions updated to use pointer throughout

• Add a Validate method to the WorkloadReconciler interface to let each workload implement its own validation of the role’s deployment shape:

  • DeploymentReconciler: role.Template must not be empty (nil).
  • StatefulSetReconciler: role.Template must not be empty (nil).
  • LeaderWorkerSetReconciler: if Template is empty (nil), neither PatchLeaderTemplate nor PatchWorkerTemplate may be empty (nil).

Ⅲ. Does this pull request fix one issue?

Ⅳ. List the added test cases (unit test/integration test) if any, please explain if no tests are needed.

Ⅴ. Describe how to verify it

VI. Special notes for reviews

Checklist

• Format your code make fmt.
• Add unit tests or integration tests.
• Update the documentation related to the change.

[gemini-code-assist]

Summary of Changes

Hello @Syspretor, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the RoleSpec API within the RBG system by converting key fields related to LeaderWorkerSet and its patching mechanisms to pointer types. This modification enhances the API's expressiveness by clearly differentiating between unset and explicitly zero-valued configurations, thereby preventing potential misinterpretations. Concurrently, it introduces a standardized validation framework across different workload reconcilers, enabling more precise and workload-specific checks on deployment configurations.

Highlights

• API Field Type Migration: The RoleSpec.LeaderWorkerSet field and its nested PatchLeaderTemplate and PatchWorkerTemplate fields have been migrated from value types to pointer types (*LeaderWorkerTemplate and *runtime.RawExtension respectively). This change aims to prevent misleading default values and improve clarity in API definitions.
• Enhanced Workload Validation: A new Validate method has been added to the WorkloadReconciler interface, allowing each workload type (Deployment, StatefulSet, LeaderWorkerSet) to implement specific validation logic for its declared deployment shape. This ensures more robust configuration checks.
• Backward Compatibility and Nil Handling: The controller logic has been updated to gracefully handle nil LeaderWorkerSet fields, ensuring backward compatibility. Internal functions now consistently use pointer types, and a default LeaderWorkerSet with a size of 1 is initialized if it's nil during configuration construction.

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[gemini-code-assist]

Code Review

This pull request refactors the LeaderWorkerSet field in RoleSpec to be a pointer, which improves API flexibility. The changes correctly propagate this modification through the API types, generated code, and controller logic. My review focuses on ensuring robust handling of the new pointer type to prevent nil dereferences and ensuring that the new validation logic is correctly enforced. I've identified a critical issue that could cause a panic in the validation logic, a high-severity issue where validation failures are not handled correctly, and a medium-severity suggestion to improve code clarity and maintainability.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[Copilot]

Pull Request Overview

This PR migrates the LeaderWorkerSet field and its nested PatchLeaderTemplate and PatchWorkerTemplate fields from value types to pointer types to avoid misleading default values and improve validation of role deployment configurations. A Validate method is added to the WorkloadReconciler interface to enforce workload-specific validation rules.

Key changes:

• API fields migrated to pointers: RoleSpec.LeaderWorkerSet, LeaderWorkerTemplate.PatchLeaderTemplate, and LeaderWorkerTemplate.PatchWorkerTemplate
• Added Validate() method to WorkloadReconciler interface with implementations for Deployment, StatefulSet, and LeaderWorkerSet reconcilers
• Updated controller logic to call validation and handle nil pointers with fallback defaults

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
api/workloads/v1alpha1/rolebasedgroup_types.go	Changed LeaderWorkerSet and patch template fields to pointer types
api/workloads/v1alpha1/zz_generated.deepcopy.go	Generated DeepCopy methods updated to handle nil pointers
api/workloads/v1alpha1/helper.go	Added nil check for LeaderWorkerSet in GetGroupSize()
pkg/reconciler/workload_reconciler.go	Added Validate method to WorkloadReconciler interface
pkg/reconciler/deploy_reconciler.go	Implemented Validate method requiring non-nil Template
pkg/reconciler/sts_reconciler.go	Implemented Validate method requiring non-nil Template
pkg/reconciler/lws_reconciler.go	Implemented Validate method and added nil handling in constructLWSApplyConfiguration
internal/controller/workloads/rolebasedgroup_controller.go	Integrated validation call in reconcile loop
test/wrappers/role_wrapper.go	Updated test helper to use pointer types
test/e2e/testcase/lws.go	Updated e2e test to wrap patches with ptr.To()
pkg/reconciler/lws_reconciler_test.go	Updated test to use pointer for LeaderWorkerSet

Comments suppressed due to low confidence (1)

pkg/reconciler/lws_reconciler.go:262

• Potential nil pointer dereference if role.LeaderWorkerSet.Size is nil. The fallback initialization at line 202-206 only sets a default Size if the entire LeaderWorkerSet is nil, but doesn't handle the case where LeaderWorkerSet is non-nil but Size is nil. Add a nil check or ensure Size has a default value.

				WithSize(*role.LeaderWorkerSet.Size).

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[cheyang]

/lgtm
/approve