partition support float percent

Signed-off-by: shiyan2016 <shiyan20160606@gmail.com>

pkg/util/tools.go

@@ -18,7 +18,10 @@ limitations under the License.
 package util
 
 import (
+	"fmt"
 	"math"
+	"strconv"
+	"strings"
 	"sync"
 
 	"github.com/docker/distribution/reference"
@@ -163,7 +166,7 @@ func CalculatePartitionReplicas(partition *intstrutil.IntOrString, replicasPoint
 	}
 
 	// 'roundUp=true' will ensure at least 1 old pod is reserved if partition > "0%" and replicas > 0.
-	pValue, err := intstrutil.GetScaledValueFromIntOrPercent(partition, replicas, true)
+	pValue, err := GetScaledValueFromIntOrPercent(partition, replicas, true)
 	if err != nil {
 		return pValue, err
 	}
@@ -189,3 +192,33 @@ func IsReferenceEqual(ref1, ref2 appsv1alpha1.TargetReference) bool {
 	}
 	return gv1.Group == gv2.Group && ref1.Kind == ref2.Kind && ref1.Name == ref2.Name
 }
+
+func GetScaledValueFromIntOrPercent(intOrPercent *intstrutil.IntOrString, total int, roundUp bool) (int, error) {
+	if intOrPercent == nil {
+		return 0, fmt.Errorf("nil value for IntOrString")
+	}
+
+	switch intOrPercent.Type {
+	case intstrutil.Int:
+		return intOrPercent.IntValue(), nil
+	case intstrutil.String:
+		s := intOrPercent.StrVal
+		if strings.HasSuffix(s, "%") {
+			s = strings.TrimSuffix(intOrPercent.StrVal, "%")
+		} else {
+			return 0, fmt.Errorf("invalid type: string is not a percentage")
+		}
+		v, err := strconv.ParseFloat(s, 64)
+		if err != nil {
+			return 0, err
+		}
+		var value int
+		if roundUp {
+			value = int(math.Ceil(v * (float64(total)) / 100))
+		} else {
+			value = int(math.Floor(v * (float64(total)) / 100))
+		}
+		return value, nil
+	}
+	return 0, fmt.Errorf("invalid type: neither int nor percentage")
+}

pkg/util/tools_test.go

@@ -299,3 +299,79 @@ func TestCalculatePartitionReplicas(t *testing.T) {
 		})
 	}
 }
+
+func TestGetScaledValueFromIntOrPercent(t *testing.T) {
+	tests := []struct {
+		input     intstr.IntOrString
+		total     int
+		roundUp   bool
+		expectErr bool
+		expectVal int
+	}{
+		{
+			input:     intstr.FromInt(123),
+			expectErr: false,
+			expectVal: 123,
+		},
+		{
+			input:     intstr.FromString("90%"),
+			total:     100,
+			roundUp:   true,
+			expectErr: false,
+			expectVal: 90,
+		},
+		{
+			input:     intstr.FromString("90%"),
+			total:     95,
+			roundUp:   true,
+			expectErr: false,
+			expectVal: 86,
+		},
+		{
+			input:     intstr.FromString("90%"),
+			total:     95,
+			roundUp:   false,
+			expectErr: false,
+			expectVal: 85,
+		},
+		{
+			input:     intstr.FromString("99.99%"),
+			total:     95,
+			roundUp:   false,
+			expectErr: false,
+			expectVal: 94,
+		},
+		{
+			input:     intstr.FromString("%"),
+			expectErr: true,
+		},
+		{
+			input:     intstr.FromString("90#"),
+			expectErr: true,
+		},
+		{
+			input:     intstr.FromString("#%"),
+			expectErr: true,
+		},
+		{
+			input:     intstr.FromString("90"),
+			expectErr: true,
+		},
+	}
+
+	for i, test := range tests {
+		t.Logf("test case %d", i)
+		value, err := GetScaledValueFromIntOrPercent(&test.input, test.total, test.roundUp)
+		if test.expectErr && err == nil {
+			t.Errorf("expected error, but got none")
+			continue
+		}
+		if !test.expectErr && err != nil {
+			t.Errorf("unexpected err: %v", err)
+			continue
+		}
+		if test.expectVal != value {
+			t.Errorf("expected %v, but got %v", test.expectVal, value)
+		}
+	}
+}

pkg/webhook/cloneset/validating/validation.go

@@ -138,7 +138,7 @@ func (h *CloneSetCreateUpdateHandler) validateUpdateStrategy(strategy *appsv1alp
 			appsv1alpha1.InPlaceOnlyCloneSetUpdateStrategyType)))
 	}
 
-	partition, err := intstrutil.GetValueFromIntOrPercent(strategy.Partition, replicas, true)
+	partition, err := util.GetScaledValueFromIntOrPercent(strategy.Partition, replicas, true)
 	if err != nil {
 		allErrs = append(allErrs, field.Invalid(fldPath.Child("partition"), strategy.Partition.String(),
 			fmt.Sprintf("failed getValueFromIntOrPercent for partition: %v", err)))