Add functions to support precise float compute of weight (#5663)

provider/kubernetes/percentage.go

@@ -3,6 +3,8 @@ package kubernetes
 import (
 	"strconv"
 	"strings"
+
+	"github.com/shopspring/decimal"
 )
 
 const defaultPercentageValuePrecision = 3
@@ -43,5 +45,6 @@ func newPercentageValueFromString(rawValue string) (percentageValue, error) {
 
 // newPercentageValueFromFloat64 reads percentage value from float64
 func newPercentageValueFromFloat64(f float64) percentageValue {
-	return percentageValue(f * (1000 * 100))
+	value := decimal.NewFromFloat(f).Mul(decimal.NewFromFloat(1000 * 100))
+	return percentageValue(value.IntPart())
 }

provider/kubernetes/percentage_test.go

@@ -74,46 +74,54 @@ func TestNewPercentageValueFromString(t *testing.T) {
 	}{
 		{
 			value:           "1%",
-			expectError:     false,
 			expectedString:  "1.000%",
 			expectedFloat64: 0.01,
 		},
 		{
 			value:           "0.5",
-			expectError:     false,
 			expectedString:  "0.500%",
 			expectedFloat64: 0.005,
 		},
 		{
 			value:           "99%",
-			expectError:     false,
 			expectedString:  "99.000%",
 			expectedFloat64: 0.99,
 		},
 		{
 			value:           "99.9%",
-			expectError:     false,
 			expectedString:  "99.900%",
 			expectedFloat64: 0.999,
 		},
 		{
 			value:           "-99.9%",
-			expectError:     false,
 			expectedString:  "-99.900%",
 			expectedFloat64: -0.999,
 		},
 		{
 			value:           "-99.99999%",
-			expectError:     false,
 			expectedString:  "-99.999%",
 			expectedFloat64: -0.99999,
 		},
 		{
 			value:           "0%",
-			expectError:     false,
 			expectedString:  "0.000%",
 			expectedFloat64: 0,
 		},
+		{
+			value:           "2.3%",
+			expectedString:  "2.300%",
+			expectedFloat64: 0.023,
+		},
+		{
+			value:           "5.1%",
+			expectedString:  "5.100%",
+			expectedFloat64: 0.051,
+		},
+		{
+			value:           "83.85%",
+			expectedString:  "83.850%",
+			expectedFloat64: 0.83850,
+		},
 		{
 			value:       "%",
 			expectError: true,