Mullvad updater (#228)

* Add Mullvad to updater cli
* Update hardcoded servers for Mullvad

internal/updater/updater.go

@@ -2,6 +2,7 @@ package updater
 
 import (
 	"fmt"
+	"net/http"
 	"time"
 
 	"github.com/qdm12/gluetun/internal/constants"
@@ -16,13 +17,15 @@ type updater struct {
 	storage storage.Storage
 	timeNow func() time.Time
 	println func(s string)
+	httpGet func(url string) (resp *http.Response, err error)
 }
 
-func New(storage storage.Storage) Updater {
+func New(storage storage.Storage, httpClient *http.Client) Updater {
 	return &updater{
 		storage: storage,
 		timeNow: time.Now,
 		println: func(s string) { fmt.Println(s) },
+		httpGet: httpClient.Get,
 	}
 }
 
@@ -59,6 +62,18 @@ func (u *updater) UpdateServers(options Options) error {
 		allServers.PiaOld.Servers = servers
 	}
 
+	if options.Mullvad {
+		servers, err := u.findMullvadServers()
+		if err != nil {
+			return fmt.Errorf("cannot update Mullvad servers: %w", err)
+		}
+		if options.Stdout {
+			u.println(stringifyMullvadServers(servers))
+		}
+		allServers.Mullvad.Timestamp = u.timeNow().Unix()
+		allServers.Mullvad.Servers = servers
+	}
+
 	if options.File {
 		if err := u.storage.FlushToFile(allServers); err != nil {
 			return fmt.Errorf("cannot update servers: %w", err)