Move config into separate package

config/type_duration.go

@@ -0,0 +1,46 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+type TypeDuration struct {
+	value time.Duration
+}
+
+func (c *TypeDuration) UnmarshalText(data []byte) error {
+	if len(data) == 0 {
+		return nil
+	}
+
+	dur, err := time.ParseDuration(strings.ToLower(string(data)))
+	if err != nil {
+		return fmt.Errorf("incorrect duration: %w", err)
+	}
+
+	if dur < 0 {
+		return fmt.Errorf("%s should be positive duration", dur)
+	}
+
+	c.value = dur
+
+	return nil
+}
+
+func (c TypeDuration) MarshalText() ([]byte, error) { // nolint: unparam
+	return []byte(c.value.String()), nil
+}
+
+func (c TypeDuration) String() string {
+	return c.value.String()
+}
+
+func (c TypeDuration) Value(defaultValue time.Duration) time.Duration {
+	if c.value == 0 {
+		return defaultValue
+	}
+
+	return c.value
+}