[Feature] Add P0 Compare func (#1490)

CHANGELOG.md

@@ -13,6 +13,7 @@
 - (Feature) Add support for CRD validation schemas
 - (Bugfix) Fix Replaced Member Zone during Replace operation
 - (Feature) (ML) Handlers
+- (Feature) Add P0 Compare Func
 
 ## [1.2.35](https://github.com/arangodb/kube-arangodb/tree/1.2.35) (2023-11-06)
 - (Maintenance) Update go-driver to v1.6.0, update IsNotFound() checks

pkg/util/compare/compare.go

@@ -27,6 +27,75 @@ import (
 	"github.com/arangodb/kube-arangodb/pkg/logging"
 )
 
+// P0 runs compare of the provided templates without generic parameters
+func P0[T interface{}](
+	log logging.Logger,
+	actionBuilder api.ActionBuilder,
+	checksum Checksum[T],
+	spec, status Template[T],
+	evaluators ...GenP0[T]) (mode Mode, plan api.Plan, err error) {
+	if spec.GetChecksum() == status.GetChecksum() {
+		return SkippedRotation, nil, nil
+	}
+
+	mode = SilentRotation
+
+	// Try to fill fields
+	newStatus := status.GetTemplate()
+	currentSpec := spec.GetTemplate()
+
+	g := NewFuncGenP0[T](currentSpec, newStatus)
+
+	evaluatorsFunc := make([]Func, len(evaluators))
+
+	for id := range evaluators {
+		evaluatorsFunc[id] = g(evaluators[id])
+	}
+
+	if m, p, err := Evaluate(actionBuilder, evaluatorsFunc...); err != nil {
+		log.Err(err).Error("Error while getting diff")
+		return SkippedRotation, nil, err
+	} else {
+		mode = mode.And(m)
+		plan = append(plan, p...)
+	}
+
+	// Diff has been generated! Proceed with calculations
+
+	checksumString, err := checksum(newStatus)
+	if err != nil {
+		log.Err(err).Error("Error while getting checksum")
+		return SkippedRotation, nil, err
+	}
+
+	if checksumString != spec.GetChecksum() {
+		line := log
+
+		// Rotate anyway!
+		specData, statusData, diff, err := Diff(currentSpec, newStatus)
+		if err == nil {
+
+			if diff != "" {
+				line = line.Str("diff", diff)
+			}
+
+			if specData != "" {
+				line = line.Str("spec", specData)
+			}
+
+			if statusData != "" {
+				line = line.Str("status", statusData)
+			}
+		}
+
+		line.Info("Resource %s needs rotation - templates does not match", reflect.TypeOf(currentSpec).String())
+
+		return GracefulRotation, nil, nil
+	}
+
+	return
+}
+
 // P2 runs compare of the provided templates with 2 generic parameters
 func P2[T interface{}, P1, P2 interface{}](
 	log logging.Logger,

pkg/util/compare/gen.go

@@ -20,6 +20,16 @@
 
 package compare
 
+type GenP0[T interface{}] func(spec, status *T) Func
+
+type FuncGenP0[T interface{}] func(in GenP0[T]) Func
+
+func NewFuncGenP0[T interface{}](spec, status *T) FuncGenP0[T] {
+	return func(in GenP0[T]) Func {
+		return in(spec, status)
+	}
+}
+
 type GenP2[T, P1, P2 interface{}] func(p1 P1, p2 P2, spec, status *T) Func
 
 type FuncGenP2[T, P1, P2 interface{}] func(in GenP2[T, P1, P2]) Func