Fix #261 add variable HTTP_CONTROL_SERVER_PORT

internal/settings/server.go

@@ -0,0 +1,30 @@
+package settings
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/qdm12/gluetun/internal/params"
+)
+
+// ControlServer contains settings to customize the control server operation
+type ControlServer struct {
+	Port uint16
+}
+
+func (c *ControlServer) String() string {
+	settingsList := []string{
+		"HTTP Control server:",
+		fmt.Sprintf("Listening port: %d", c.Port),
+	}
+	return strings.Join(settingsList, "\n |--")
+}
+
+// GetControlServerSettings obtains the HTTP control server settings from environment variables using the params package.
+func GetControlServerSettings(paramsReader params.Reader) (settings ControlServer, err error) {
+	settings.Port, err = paramsReader.GetControlServerPort()
+	if err != nil {
+		return settings, err
+	}
+	return settings, nil
+}