Add filter and weigher for project reservations

internal/scheduling/decisions/nova/plugins/filters/filter_project_reservations.go

@@ -0,0 +1,54 @@
+// Copyright 2025 SAP SE
+// SPDX-License-Identifier: Apache-2.0
+
+package filters
+
+import (
+	"context"
+	"log/slog"
+
+	api "github.com/cobaltcore-dev/cortex/api/delegation/nova"
+	"github.com/cobaltcore-dev/cortex/api/v1alpha1"
+	"github.com/cobaltcore-dev/cortex/internal/scheduling/lib"
+)
+
+type FilterProjectReservations struct {
+	lib.BaseStep[api.ExternalSchedulerRequest, lib.EmptyStepOpts]
+}
+
+func (s *FilterProjectReservations) Run(traceLog *slog.Logger, request api.ExternalSchedulerRequest) (*lib.StepResult, error) {
+	result := s.PrepareResult(request)
+	var reservations v1alpha1.ReservationList
+	ctx := context.Background()
+	if err := s.Client.List(ctx, &reservations); err != nil {
+		return nil, err
+	}
+
+	hostHasReservation := make(map[string]bool)
+
+	for _, reservation := range reservations.Items {
+		if reservation.Status.Phase != v1alpha1.ReservationStatusPhaseActive {
+			continue // Only consider active reservations.
+		}
+		if reservation.Spec.Scheduler.CortexNova == nil {
+			continue // Not handled by us.
+		}
+		// If the requested vm matches this reservation, free the resources.
+		if reservation.Spec.Scheduler.CortexNova.ProjectID == request.Spec.Data.ProjectID &&
+			reservation.Spec.Scheduler.CortexNova.FlavorName == request.Spec.Data.Flavor.Data.Name {
+			hostHasReservation[reservation.Status.Host] = true
+			break
+		}
+	}
+	for host := range result.Activations {
+		// Filter out hosts that do not have a matching reservation.
+		if _, ok := hostHasReservation[host]; !ok {
+			delete(result.Activations, host)
+			traceLog.Debug(
+				"removing host with unknown capacity",
+				"host", host,
+			)
+		}
+	}
+	return result, nil
+}

internal/scheduling/decisions/nova/plugins/weighers/project_reservations.go

@@ -0,0 +1,52 @@
+// Copyright 2025 SAP SE
+// SPDX-License-Identifier: Apache-2.0
+
+package weighers
+
+import (
+	"context"
+	"log/slog"
+
+	api "github.com/cobaltcore-dev/cortex/api/delegation/nova"
+	"github.com/cobaltcore-dev/cortex/api/v1alpha1"
+	"github.com/cobaltcore-dev/cortex/internal/scheduling/lib"
+)
+
+type ProjectReservations struct {
+	lib.BaseStep[api.ExternalSchedulerRequest, lib.EmptyStepOpts]
+}
+
+func (s *ProjectReservations) Run(traceLog *slog.Logger, request api.ExternalSchedulerRequest) (*lib.StepResult, error) {
+	result := s.PrepareResult(request)
+	var reservations v1alpha1.ReservationList
+	ctx := context.Background()
+	if err := s.Client.List(ctx, &reservations); err != nil {
+		return nil, err
+	}
+
+	hostHasReservation := make(map[string]bool)
+
+	for _, reservation := range reservations.Items {
+		if reservation.Status.Phase != v1alpha1.ReservationStatusPhaseActive {
+			continue // Only consider active reservations.
+		}
+		if reservation.Spec.Scheduler.CortexNova == nil {
+			continue // Not handled by us.
+		}
+		// If the requested vm matches this reservation, free the resources.
+		if reservation.Spec.Scheduler.CortexNova.ProjectID == request.Spec.Data.ProjectID &&
+			reservation.Spec.Scheduler.CortexNova.FlavorName == request.Spec.Data.Flavor.Data.Name {
+			hostHasReservation[reservation.Status.Host] = true
+			break
+		}
+	}
+	for host := range result.Activations {
+		// Prefer hosts that have a matching reservation.
+		if _, ok := hostHasReservation[host]; ok {
+			result.Activations[host] = 1
+			continue
+		}
+		result.Activations[host] = -1
+	}
+	return result, nil
+}