[Feature] Allow to pass EphemeralStorage Resource to the Pods (#1401)

CHANGELOG.md

@@ -14,6 +14,7 @@
 - (Feature) Reconciliation Loop Interval option
 - (Bugfix) Fix GZIP encoding in case of small responses
 - (Bugfix) Fix PVC Rotation Discovery
+- (Feature) Allow to pass EphemeralStorage Resource to the Pods
 
 ## [1.2.32](https://github.com/arangodb/kube-arangodb/tree/1.2.32) (2023-08-07)
 - (Feature) Backup lifetime - remove Backup once its lifetime has been reached

pkg/util/k8sutil/pods.go

@@ -534,21 +534,33 @@ func operatorInitContainer(name, operatorImage string, command []string, securit
 
 // ExtractPodResourceRequirement filters resource requirements for Pods.
 func ExtractPodResourceRequirement(resources core.ResourceRequirements) core.ResourceRequirements {
-
-	filterStorage := func(list core.ResourceList) core.ResourceList {
-		newlist := make(core.ResourceList)
-		if q, ok := list[core.ResourceCPU]; ok {
-			newlist[core.ResourceCPU] = q
-		}
-		if q, ok := list[core.ResourceMemory]; ok {
-			newlist[core.ResourceMemory] = q
-		}
-		return newlist
-	}
+	filter := PodResourceRequirementsFilter(core.ResourceCPU, core.ResourceMemory, core.ResourceEphemeralStorage)
 
 	return core.ResourceRequirements{
-		Limits:   filterStorage(resources.Limits),
-		Requests: filterStorage(resources.Requests),
+		Limits:   filter(resources.Limits),
+		Requests: filter(resources.Requests),
+	}
+}
+
+func PodResourceRequirementsFilter(filters ...core.ResourceName) func(in core.ResourceList) core.ResourceList {
+	return func(in core.ResourceList) core.ResourceList {
+		filtered := map[core.ResourceName]bool{}
+
+		for _, k := range filters {
+			filtered[k] = true
+		}
+
+		n := core.ResourceList{}
+
+		for k, v := range in {
+			if _, ok := filtered[k]; !ok {
+				continue
+			}
+
+			n[k] = v
+		}
+
+		return n
 	}
 }
 

pkg/util/k8sutil/pods_test.go

@@ -22,14 +22,17 @@ package k8sutil
 
 import (
 	"context"
+	"fmt"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	core "k8s.io/api/core/v1"
+	resource "k8s.io/apimachinery/pkg/api/resource"
 	meta "k8s.io/apimachinery/pkg/apis/meta/v1"
 
 	"github.com/arangodb/kube-arangodb/pkg/handlers/utils"
+	"github.com/arangodb/kube-arangodb/pkg/util"
 	"github.com/arangodb/kube-arangodb/pkg/util/constants"
 	"github.com/arangodb/kube-arangodb/pkg/util/kclient"
 )
@@ -416,3 +419,61 @@ func Test_EnsureFinalizer(t *testing.T) {
 		require.NotContains(t, pod.Finalizers, f)
 	})
 }
+
+func Test_ExtractPodResourceRequirement(t *testing.T) {
+	v, err := resource.ParseQuantity("1Gi")
+	require.NoError(t, err)
+
+	t.Run("Filter Storage", func(t *testing.T) {
+		in := core.ResourceRequirements{
+			Limits: map[core.ResourceName]resource.Quantity{
+				core.ResourceCPU:     v,
+				core.ResourceStorage: v,
+			},
+		}
+		require.Len(t, in.Limits, 2)
+		require.Len(t, in.Requests, 0)
+
+		out := ExtractPodResourceRequirement(in)
+		require.Len(t, out.Limits, 1)
+		require.Contains(t, out.Limits, core.ResourceCPU)
+		require.NotContains(t, out.Limits, core.ResourceStorage)
+		require.Len(t, out.Requests, 0)
+	})
+
+	t.Run("Ensure that all required Resources are filtered", func(t *testing.T) {
+		resources := map[core.ResourceName]bool{
+			core.ResourceCPU:              true,
+			core.ResourceMemory:           true,
+			core.ResourceStorage:          false,
+			core.ResourceEphemeralStorage: true,
+		}
+
+		in := core.ResourceRequirements{
+			Limits:   core.ResourceList{},
+			Requests: core.ResourceList{},
+		}
+
+		for k := range resources {
+			in.Limits[k] = v
+			in.Requests[k] = v
+		}
+
+		out := ExtractPodResourceRequirement(in)
+
+		for k, v := range resources {
+			t.Run(fmt.Sprintf("Resource %s should be %s", k, util.BoolSwitch(v, "present", "missing")), func(t *testing.T) {
+				require.Contains(t, in.Requests, k)
+				require.Contains(t, in.Limits, k)
+
+				if v {
+					require.Contains(t, out.Requests, k)
+					require.Contains(t, out.Limits, k)
+				} else {
+					require.NotContains(t, out.Requests, k)
+					require.NotContains(t, out.Limits, k)
+				}
+			})
+		}
+	})
+}