service: allow overriding Service ports in OverrideServiceSpec by lmiccini · Pull Request #763 · openstack-k8s-operators/lib-common

lmiccini · 2026-09-30T11:49:40Z

Add a Ports field to OverrideServiceSpec using a dedicated OverrideServicePort type that exposes only Name and Port.
Each entry changes the Port of the base Service port with the matching Name; TargetPort and every other field are preserved so the exposed port can change without moving backend routing.
When the base relies on Kubernetes defaulting TargetPort to Port and the Port changes, TargetPort is pinned
to the original base Port.

An override whose Name does not match any base port is rejected (ErrUnknownServicePort), and the merged result is validated for duplicate (Port, Protocol) pairs.
This supports placing several Services on a single shared LoadBalancer IP by changing their Port values.

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📒 Files selected for processing (4)

modules/common/service/service.go
modules/common/service/service_test.go
modules/common/service/types.go
modules/common/service/zz_generated.deepcopy.go

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📝 Summary

Summary by CodeRabbit

New Features
- Service overrides can change the exposed port of an existing port by name while preserving its other settings. Overrides cannot add ports.
Bug Fixes
- Services retain their base ports when no port overrides are supplied.
- Changing a port number without specifying a backend port preserves the original backend port.
- Overrides are rejected if they reference an unknown port name or create duplicate port/protocol pairs. An unspecified protocol is treated as TCP when checking for duplicates.

Walkthrough

OverrideServiceSpec now supports named service port overrides. NewService updates matching base ports, preserves their other fields, and validates the merged port list. ToOverrideServiceSpec clears ports when converting a live Service.

Changes

Service port overrides

Layer / File(s)	Summary
Port override contract `modules/common/service/types.go`, `modules/common/service/zz_generated.deepcopy.go`	`OverrideServiceSpec` adds an optional `Ports` field. Each entry names a base port and provides a replacement port number. The deep-copy methods copy the entries.
Service port merging `modules/common/service/service.go`, `modules/common/service/service_test.go`	`NewService` applies port overrides by name outside the strategic merge patch. It rejects unknown names and duplicate `(Port, Protocol)` pairs, treating an empty protocol as TCP. When a port changes and `TargetPort` is unset, `NewService` sets it to the original port. Tests cover unchanged ports, overrides, and errors.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Suggested reviewers: stuggi

Merge Risk: ⚪ Minimal · up to 77852

This change adds named Service port overrides and validates the merged result. No remaining merge-blocking risk is evident from the reviewed changes.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 62.50% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
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.
Title check	✅ Passed	The title clearly and concisely states that Service ports can be overridden in OverrideServiceSpec.
Description check	✅ Passed	The description directly explains the new Ports field, matching behavior, TargetPort handling, validation errors, and intended LoadBalancer use case.

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Inline comments:
Review comments at @modules/common/service/service.go:
- Around line 126-129: Update NewService or the webhook validation around
mergeServicePortsByName to reject overrides with an empty Name when the merged
port list contains multiple ports, and reject merged ports with duplicate (Port,
Protocol) pairs. Keep the existing merge behavior for valid port lists.

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modules/common/service/zz_generated.deepcopy.go

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lmiccini · 2026-09-30T12:33:27Z

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lmiccini · 2026-09-30T12:44:04Z

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lmiccini · 2026-09-30T13:00:18Z

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Inline comments:
Review comments at @modules/common/service/service.go:
- Line 187: In NewService, preserve the base port as the effective TargetPort
when both the base and override TargetPort are unset, before applying the
override Port. Add a regression test through NewService verifying that changing
Port does not change backend routing.

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modules/common/service/zz_generated.deepcopy.go

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lmiccini · 2026-09-30T13:48:37Z

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lmiccini · 2026-09-30T14:06:03Z

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Inline comments:
Review comments at @modules/common/service/types.go:
- Line 195: Update the Ports field’s override schema so port can be omitted when
an override supplies only name and targetPort; if corev1.ServicePort keeps port
required in the generated CRD, define and use an override-specific port type
that makes it optional.

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📒 Files selected for processing (4)

modules/common/service/service.go
modules/common/service/service_test.go
modules/common/service/types.go
modules/common/service/zz_generated.deepcopy.go

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Add a Ports field to OverrideServiceSpec using a dedicated OverrideServicePort type that exposes only Name and Port. Each entry changes the Port of the base Service port with the matching Name; TargetPort and every other field are preserved so the exposed port can change without moving backend routing. When the base relies on Kubernetes defaulting TargetPort to Port and the Port changes, TargetPort is pinned to the original base Port. An override whose Name does not match any base port is rejected (ErrUnknownServicePort), and the merged result is validated for duplicate (Port, Protocol) pairs. This supports placing several Services on a single shared LoadBalancer IP by changing their Port values. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

lmiccini · 2026-10-02T07:19:10Z

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stuggi reviewed Oct 1, 2026

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lmiccini force-pushed the service-override-ports branch 2 times, most recently from 7785271 to 721b11b Compare October 2, 2026 07:02

lmiccini force-pushed the service-override-ports branch from 721b11b to ea9f6a4 Compare October 2, 2026 07:04

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