Rewrite/status management

[Tanker2020]

Summary

Ports the Python oper8 status management layer to Go. Provides helpers for building and updating the status block of oper8-managed Kubernetes custom resources, including the Ready/Updating condition pair, IBM CloudPak service-status fields, component-status reporting, and a timestamp-aware diff to avoid spurious status patches.

Files changed:

• rewrite/status/status.go — all public API
• rewrite/status/status_test.go — 28 table-driven tests
• .github/workflows/pr3-status.yml — CI

Depends on: PR-1 (dag/ package — CompletionState and Node are used in componentStatus generation). Stacked on PR-2 branch but does not import deploymanager/.

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What was ported

Python	Go equivalent
status.py — make_application_status()	status.MakeApplicationStatus(opts Options)
status.py — update_application_status()	status.UpdateApplicationStatus(current, opts Options)
status.py — status_changed()	status.StatusChanged(current, proposed)
status.py — get_condition()	status.GetCondition(condType, status)
status.py — get_version()	status.GetVersion(status)
ReadyReason, UpdatingReason, ServiceStatus enums	typed string constants (same values)

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Design decisions

**kwargs → Options struct

Python's make_application_status accepted 12 keyword arguments. Go uses a single Options struct. Zero values are treated as "not provided" — callers set only the fields they need. This makes call sites self-documenting and prevents argument-order mistakes.

deepdiff → JSON round-trip with timestamp stripping

Python's status_changed() used the deepdiff library, excluding timestamp keys via exclude_obj_callback. Go replaces this with a recursive stripTimestamps() helper that deep-copies the map while dropping lastTransactionTime keys, then compares via json.Marshal. No external dependency.

TimestampKey = "lastTransactionTime" (not lastTransitionTime)

The Python source uses the non-standard key lastTransactionTime (oper8-specific, not the standard Kubernetes lastTransitionTime). The Go port preserves this exactly to maintain wire compatibility with existing CR status fields.

config.operator_version not injected in UpdateApplicationStatus

Python's update_application_status automatically stamped config.operator_version into every status update. The config package is not yet ported (future PR-5). UpdateApplicationStatus accepts opts.OperatorVersion explicitly — callers that need it can pass it; nothing is silently injected.

update_resource_status not ported

Python's update_resource_status combined get_object_current_state + update_application_status + set_status into one helper. This convenience function belongs in the reconcile layer (PR-5) which has access to a live DeployManager. It is not included here to keep this package free of deploymanager dependency.

Bug fix: verifiedComponents key was missing

The initial port omitted the verifiedComponents list from componentStatus — the Python _make_component_state function emits it, and downstream consumers (dashboards, tooling) read it. Fixed and covered by a regression test.

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Test coverage (28 tests)

Area	Tests
MakeApplicationStatus	ReadyStable, ReadyInProgress, ReadyErrored, no conditions, external conditions, version fields, componentStatus counts, componentStatus dep-graph, kind service status (Completed/Failed/InProgress/custom not overwritten)
UpdateApplicationStatus	preserves existing reasons, overrides reason, preserves external conditions, preserves external status fields
StatusChanged	same content different timestamp (false), different reason (true), nil inputs, added field
GetCondition	found, not found
GetVersion	present, missing
UpdatingReason active/inactive matrix	all 6 reasons
componentStatus sorting	alphabetical node order
verifiedComponents regression	key present with correct count

All tests run with -race.