Move config into separate package

config/type_float.go

@@ -0,0 +1,41 @@
+package config
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type TypeFloat struct {
+	value float64
+}
+
+func (c *TypeFloat) UnmarshalJSON(data []byte) error {
+	value, err := strconv.ParseFloat(string(data), 64)
+	if err != nil {
+		return fmt.Errorf("incorrect float value: %w", err)
+	}
+
+	if value < 0 {
+		return fmt.Errorf("%f should be positive", value)
+	}
+
+	c.value = value
+
+	return nil
+}
+
+func (c *TypeFloat) MarshalText() ([]byte, error) { // nolint: unparam
+	return []byte(c.String()), nil
+}
+
+func (c TypeFloat) String() string {
+	return strconv.FormatFloat(c.value, 'f', -1, 64)
+}
+
+func (c TypeFloat) Value(defaultValue float64) float64 {
+	if c.value < 0.00001 {
+		return defaultValue
+	}
+
+	return c.value
+}