Maint: minor changes to openvpn/config package

- Constructor returns concrete struct instead of interface
- Rename conf to openvpnConf in openvpn loop

cmd/gluetun/main.go

@@ -143,7 +143,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 	httpClient := &http.Client{Timeout: clientTimeout}
 	// Create configurators
 	alpineConf := alpine.New()
-	ovpnConf := openvpnconfig.NewConfigurator(
+	ovpnConf := openvpnconfig.New(
 		logger.NewChild(logging.Settings{Prefix: "openvpn configurator: "}),
 		cmder, puid, pgid)
 	dnsCrypto := dnscrypto.New(httpClient, "", "")

internal/openvpn/config/auth.go

@@ -11,7 +11,7 @@ type AuthWriter interface {
 }
 
 // WriteAuthFile writes the OpenVPN auth file to disk with the right permissions.
-func (c *configurator) WriteAuthFile(user, password string) error {
+func (c *Configurator) WriteAuthFile(user, password string) error {
 	file, err := os.Open(c.authFilePath)
 
 	if err != nil && !os.IsNotExist(err) {

internal/openvpn/config/command.go

@@ -23,7 +23,7 @@ type Starter interface {
 		stdoutLines, stderrLines chan string, waitError chan error, err error)
 }
 
-func (c *configurator) Start(ctx context.Context, version string, flags []string) (
+func (c *Configurator) Start(ctx context.Context, version string, flags []string) (
 	stdoutLines, stderrLines chan string, waitError chan error, err error) {
 	var bin string
 	switch version {
@@ -50,17 +50,17 @@ type VersionGetter interface {
 	Version25(ctx context.Context) (version string, err error)
 }
 
-func (c *configurator) Version24(ctx context.Context) (version string, err error) {
+func (c *Configurator) Version24(ctx context.Context) (version string, err error) {
 	return c.version(ctx, binOpenvpn24)
 }
 
-func (c *configurator) Version25(ctx context.Context) (version string, err error) {
+func (c *Configurator) Version25(ctx context.Context) (version string, err error) {
 	return c.version(ctx, binOpenvpn25)
 }
 
 var ErrVersionTooShort = errors.New("version output is too short")
 
-func (c *configurator) version(ctx context.Context, binName string) (version string, err error) {
+func (c *Configurator) version(ctx context.Context, binName string) (version string, err error) {
 	cmd := exec.CommandContext(ctx, binName, "--version")
 	output, err := c.cmder.Run(cmd)
 	if err != nil && err.Error() != "exit status 1" {

internal/openvpn/config/config.go

@@ -9,7 +9,7 @@ type Writer interface {
 	WriteConfig(lines []string) error
 }
 
-func (c *configurator) WriteConfig(lines []string) error {
+func (c *Configurator) WriteConfig(lines []string) error {
 	file, err := os.OpenFile(c.configPath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
 	if err != nil {
 		return err

internal/openvpn/config/openvpn.go

@@ -6,14 +6,14 @@ import (
 	"github.com/qdm12/golibs/logging"
 )
 
-type Configurator interface {
+type Interface interface {
 	VersionGetter
 	AuthWriter
 	Starter
 	Writer
 }
 
-type configurator struct {
+type Configurator struct {
 	logger       logging.Logger
 	cmder        command.RunStarter
 	configPath   string
@@ -21,9 +21,9 @@ type configurator struct {
 	puid, pgid   int
 }
 
-func NewConfigurator(logger logging.Logger,
-	cmder command.RunStarter, puid, pgid int) Configurator {
-	return &configurator{
+func New(logger logging.Logger,
+	cmder command.RunStarter, puid, pgid int) *Configurator {
+	return &Configurator{
 		logger:       logger,
 		cmder:        cmder,
 		configPath:   constants.OpenVPNConf,

internal/openvpn/loop.go

@@ -35,7 +35,7 @@ type Loop struct {
 	buildInfo   models.BuildInformation
 	versionInfo bool
 	// Configurators
-	conf        config.Configurator
+	openvpnConf config.Interface
 	fw          firewallConfigurer
 	routing     routing.VPNGetter
 	portForward portforward.StartStopper
@@ -65,7 +65,7 @@ const (
 
 func NewLoop(openVPNSettings configuration.OpenVPN,
 	providerSettings configuration.Provider,
-	allServers models.AllServers, conf config.Configurator,
+	allServers models.AllServers, openvpnConf config.Interface,
 	fw firewallConfigurer, routing routing.VPNGetter,
 	portForward portforward.StartStopper,
 	publicip publicip.Looper, dnsLooper dns.Looper,
@@ -84,7 +84,7 @@ func NewLoop(openVPNSettings configuration.OpenVPN,
 		state:         state,
 		buildInfo:     buildInfo,
 		versionInfo:   versionInfo,
-		conf:          conf,
+		openvpnConf:   openvpnConf,
 		fw:            fw,
 		routing:       routing,
 		portForward:   portForward,

internal/openvpn/run.go

@@ -44,13 +44,13 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 			continue
 		}
 
-		if err := l.conf.WriteConfig(lines); err != nil {
+		if err := l.openvpnConf.WriteConfig(lines); err != nil {
 			l.crashed(ctx, err)
 			continue
 		}
 
 		if openVPNSettings.User != "" {
-			err := l.conf.WriteAuthFile(openVPNSettings.User, openVPNSettings.Password)
+			err := l.openvpnConf.WriteAuthFile(openVPNSettings.User, openVPNSettings.Password)
 			if err != nil {
 				l.crashed(ctx, err)
 				continue
@@ -64,7 +64,7 @@ func (l *Loop) Run(ctx context.Context, done chan<- struct{}) {
 
 		openvpnCtx, openvpnCancel := context.WithCancel(context.Background())
 
-		stdoutLines, stderrLines, waitError, err := l.conf.Start(
+		stdoutLines, stderrLines, waitError, err := l.openvpnConf.Start(
 			openvpnCtx, openVPNSettings.Version, openVPNSettings.Flags)
 		if err != nil {
 			openvpnCancel()