Move config into separate package

config/type_bytes.go

@@ -0,0 +1,47 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/alecthomas/units"
+)
+
+type TypeBytes struct {
+	value uint
+}
+
+func (c *TypeBytes) UnmarshalText(data []byte) error {
+	if len(data) == 0 {
+		return nil
+	}
+
+	value, err := units.ParseStrictBytes(strings.ToUpper(string(data)))
+	if err != nil {
+		return fmt.Errorf("incorrect bytes value: %w", err)
+	}
+
+	if value < 0 {
+		return fmt.Errorf("%d should be positive number", value)
+	}
+
+	c.value = uint(value)
+
+	return nil
+}
+
+func (c TypeBytes) MarshalText() ([]byte, error) { // nolint: unparam
+	return []byte(c.String()), nil
+}
+
+func (c TypeBytes) String() string {
+	return units.ToString(int64(c.value), 1024, "ib", "b")
+}
+
+func (c TypeBytes) Value(defaultValue uint) uint {
+	if c.value == 0 {
+		return defaultValue
+	}
+
+	return c.value
+}