Marshalling of config to string

config.go

 	return nil
 }
 
+func (c configTypeHostPort) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeHostPort) String() string {
 	return c.Value(net.IP{}, 0)
 }
 	return nil
 }
 
+func (c *configTypePort) MarshalJSON() ([]byte, error) {
+	return json.Marshal(c.value)
+}
+
 func (c configTypePort) String() string {
 	return strconv.Itoa(int(c.value))
 }
 	return nil
 }
 
+func (c configTypeBytes) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeBytes) String() string {
 	return units.ToString(int64(c.value), 1024, "ib", "b")
 }
 	return nil
 }
 
+func (c configTypePreferIP) MarshalText() ([]byte, error) {
+	return []byte(c.value), nil
+}
+
 func (c *configTypePreferIP) String() string {
 	return c.value
 }
 	return nil
 }
 
+func (c configTypeDuration) MarshalText() ([]byte, error) {
+	return []byte(c.value.String()), nil
+}
+
 func (c configTypeDuration) String() string {
 	return c.value.String()
 }
 	return nil
 }
 
+func (c *configTypeFloat) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeFloat) String() string {
 	return strconv.FormatFloat(c.value, 'f', -1, 64)
 }
 	return nil
 }
 
+func (c *configTypeIP) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeIP) String() string {
+	if c.value == nil {
+		return ""
+	}
+
 	return c.value.String()
 }
 
 	return nil
 }
 
+func (c *configTypeURL) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeURL) String() string {
 	if c.value == nil {
 		return ""
 	return nil
 }
 
+func (c configTypeMetricPrefix) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeMetricPrefix) String() string {
 	return c.value
 }
 	return nil
 }
 
+func (c configTypeHTTPPath) MarshalText() ([]byte, error) {
+	return []byte(c.String()), nil
+}
+
 func (c configTypeHTTPPath) String() string {
 	return c.value
 }
 	return nil
 }
 
+func (c *config) String() string {
+	buf := &bytes.Buffer{}
+	encoder := json.NewEncoder(buf)
+
+	encoder.SetEscapeHTML(false)
+
+	if err := encoder.Encode(c); err != nil {
+		panic(err)
+	}
+
+	return buf.String()
+}
+
 type configRaw struct {
 	Debug     bool   `toml:"debug" json:"debug"`
 	Secret    string `toml:"secret" json:"secret"`