server(filesystem): fix inaccurate archive progress (#145)

server/backup/backup.go

@@ -8,16 +8,21 @@ import (
 	"io/fs"
 	"os"
 	"path"
-	"time"
 
 	"emperror.dev/errors"
 	"github.com/apex/log"
+	"github.com/mholt/archiver/v4"
 	"golang.org/x/sync/errgroup"
 
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/remote"
 )
 
+var format = archiver.CompressedArchive{
+	Compression: archiver.Gz{},
+	Archival:    archiver.Tar{},
+}
+
 type AdapterType string
 
 const (
@@ -27,7 +32,7 @@ const (
 
 // RestoreCallback is a generic restoration callback that exists for both local
 // and remote backups allowing the files to be restored.
-type RestoreCallback func(file string, r io.Reader, mode fs.FileMode, atime, mtime time.Time) error
+type RestoreCallback func(file string, info fs.FileInfo, r io.ReadCloser) error
 
 // noinspection GoNameStartsWithPackageName
 type BackupInterface interface {

server/backup/backup_local.go

@@ -6,8 +6,10 @@ import (
 	"os"
 
 	"emperror.dev/errors"
-	"github.com/mholt/archiver/v3"
+	"github.com/juju/ratelimit"
+	"github.com/mholt/archiver/v4"
 
+	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/remote"
 	"github.com/pterodactyl/wings/server/filesystem"
 )
@@ -79,16 +81,27 @@ func (b *LocalBackup) Generate(ctx context.Context, basePath, ignore string) (*A
 // Restore will walk over the archive and call the callback function for each
 // file encountered.
 func (b *LocalBackup) Restore(ctx context.Context, _ io.Reader, callback RestoreCallback) error {
-	return archiver.Walk(b.Path(), func(f archiver.File) error {
-		select {
-		case <-ctx.Done():
-			// Stop walking if the context is canceled.
-			return archiver.ErrStopWalk
-		default:
-			if f.IsDir() {
-				return nil
-			}
-			return callback(filesystem.ExtractNameFromArchive(f), f, f.Mode(), f.ModTime(), f.ModTime())
+	f, err := os.Open(b.Path())
+	if err != nil {
+		return err
+	}
+
+	var reader io.Reader = f
+	// Steal the logic we use for making backups which will be applied when restoring
+	// this specific backup. This allows us to prevent overloading the disk unintentionally.
+	if writeLimit := int64(config.Get().System.Backups.WriteLimit * 1024 * 1024); writeLimit > 0 {
+		reader = ratelimit.Reader(f, ratelimit.NewBucketWithRate(float64(writeLimit), writeLimit))
+	}
+	if err := format.Extract(ctx, reader, nil, func(ctx context.Context, f archiver.File) error {
+		r, err := f.Open()
+		if err != nil {
+			return err
 		}
-	})
+		defer r.Close()
+
+		return callback(filesystem.ExtractNameFromArchive(f), f.FileInfo, r)
+	}); err != nil {
+		return err
+	}
+	return nil
 }

server/backup/backup_s3.go

@@ -1,8 +1,6 @@
 package backup
 
 import (
-	"archive/tar"
-	"compress/gzip"
 	"context"
 	"fmt"
 	"io"
@@ -13,13 +11,12 @@ import (
 
 	"emperror.dev/errors"
 	"github.com/cenkalti/backoff/v4"
-
-	"github.com/pterodactyl/wings/server/filesystem"
-
 	"github.com/juju/ratelimit"
+	"github.com/mholt/archiver/v4"
 
 	"github.com/pterodactyl/wings/config"
 	"github.com/pterodactyl/wings/remote"
+	"github.com/pterodactyl/wings/server/filesystem"
 )
 
 type S3Backup struct {
@@ -96,31 +93,16 @@ func (s *S3Backup) Restore(ctx context.Context, r io.Reader, callback RestoreCal
 	if writeLimit := int64(config.Get().System.Backups.WriteLimit * 1024 * 1024); writeLimit > 0 {
 		reader = ratelimit.Reader(r, ratelimit.NewBucketWithRate(float64(writeLimit), writeLimit))
 	}
-	gr, err := gzip.NewReader(reader)
-	if err != nil {
-		return err
-	}
-	defer gr.Close()
-	tr := tar.NewReader(gr)
-	for {
-		select {
-		case <-ctx.Done():
-			return nil
-		default:
-			// Do nothing, fall through to the next block of code in this loop.
-		}
-		header, err := tr.Next()
+	if err := format.Extract(ctx, reader, nil, func(ctx context.Context, f archiver.File) error {
+		r, err := f.Open()
 		if err != nil {
-			if err == io.EOF {
-				break
-			}
 			return err
 		}
-		if header.Typeflag == tar.TypeReg {
-			if err := callback(header.Name, tr, header.FileInfo().Mode(), header.AccessTime, header.ModTime); err != nil {
-				return err
-			}
-		}
+		defer r.Close()
+
+		return callback(filesystem.ExtractNameFromArchive(f), f.FileInfo, r)
+	}); err != nil {
+		return err
 	}
 	return nil
 }