New PIA servers support (#227)

* Adapt storage: SyncServers write to file option, export FlushToFile
* CLI built-in updater for old and new PIA servers
* Update hardcoded IP addresses for PIA old and new servers
* Add PIA old to allServers struct and update timestamps
* Adapt code to work with new and old PIA servers
* Remove PIA subdomains (unneeded) from resolver tool

internal/cli/cli.go

@@ -12,6 +12,7 @@ import (
 	"github.com/qdm12/gluetun/internal/provider"
 	"github.com/qdm12/gluetun/internal/settings"
 	"github.com/qdm12/gluetun/internal/storage"
+	"github.com/qdm12/gluetun/internal/updater"
 	"github.com/qdm12/golibs/files"
 	"github.com/qdm12/golibs/logging"
 )
@@ -56,7 +57,7 @@ func OpenvpnConfig() error {
 	if err != nil {
 		return err
 	}
-	allServers, err := storage.New(logger).SyncServers(constants.GetAllServers())
+	allServers, err := storage.New(logger).SyncServers(constants.GetAllServers(), false)
 	if err != nil {
 		return err
 	}
@@ -78,3 +79,28 @@ func OpenvpnConfig() error {
 	fmt.Println(strings.Join(lines, "\n"))
 	return nil
 }
+
+func Update(args []string) error {
+	var options updater.Options
+	flagSet := flag.NewFlagSet("update", flag.ExitOnError)
+	flagSet.BoolVar(&options.File, "file", false, "Write results to /gluetun/servers.json (for end users)")
+	flagSet.BoolVar(&options.Stdout, "stdout", false, "Write results to console to modify the program (for maintainers)")
+	flagSet.BoolVar(&options.PIA, "pia", false, "Update Private Internet Access post-summer 2020 servers")
+	flagSet.BoolVar(&options.PIAold, "piaold", false, "Update Private Internet Access pre-summer 2020 servers")
+	if err := flagSet.Parse(args); err != nil {
+		return err
+	}
+	logger, err := logging.NewLogger(logging.ConsoleEncoding, logging.InfoLevel, -1)
+	if err != nil {
+		return err
+	}
+	if !options.File && !options.Stdout {
+		return fmt.Errorf("at least one of -file or -stdout must be specified")
+	}
+	storage := storage.New(logger)
+	updater := updater.New(storage)
+	if err := updater.UpdateServers(options); err != nil {
+		return err
+	}
+	return nil
+}