Abstract out more of the backup functionality

router/router_server_backup.go

@@ -12,11 +12,11 @@ import (
 func postServerBackup(c *gin.Context) {
 	s := GetServer(c.Param("server"))
 
-	data := &backup.Backup{}
+	data := &backup.LocalBackup{}
 	c.BindJSON(&data)
 
-	go func(b *backup.Backup, serv *server.Server) {
-		if err := serv.BackupRoot(b); err != nil {
+	go func(b *backup.LocalBackup, serv *server.Server) {
+		if err := serv.BackupLocal(b); err != nil {
 			zap.S().Errorw("failed to generate backup for server", zap.Error(err))
 		}
 	}(data, s)

server/backup.go

@@ -2,17 +2,41 @@ package server
 
 import (
 	"github.com/pkg/errors"
+	"github.com/pterodactyl/wings/api"
 	"github.com/pterodactyl/wings/server/backup"
 	"go.uber.org/zap"
 )
 
+// Notifies the panel of a backup's state and returns an error if one is encountered
+// while performing this action.
+func (s *Server) notifyPanelOfBackup(uuid string, ad *backup.ArchiveDetails, successful bool) error {
+	r := api.NewRequester()
+	rerr, err := r.SendBackupStatus(uuid, ad.ToRequest(successful))
+	if rerr != nil || err != nil {
+		if err != nil {
+			zap.S().Errorw(
+				"failed to notify panel of backup status due to internal code error",
+				zap.String("backup", s.Uuid),
+				zap.Error(err),
+			)
+
+			return err
+		}
+
+		zap.S().Warnw(rerr.String(), zap.String("backup", uuid))
+
+		return errors.New(rerr.String())
+	}
+
+	return nil
+}
+
 // Performs a server backup and then emits the event over the server websocket. We
 // let the actual backup system handle notifying the panel of the status, but that
 // won't emit a websocket event.
-func (s *Server) BackupRoot(b *backup.Backup) error {
-	r, err := b.LocalBackup(s.Filesystem.Path())
-	if err != nil {
-		if notifyError := b.NotifyPanel(r, false); notifyError != nil {
+func (s *Server) BackupLocal(b *backup.LocalBackup) error {
+	if err := b.Backup(s.Filesystem.Path()); err != nil {
+		if notifyError := s.notifyPanelOfBackup(b.Identifier(), &backup.ArchiveDetails{}, false); notifyError != nil {
 			zap.S().Warnw("failed to notify panel of failed backup state", zap.String("backup", b.Uuid), zap.Error(err))
 		}
 
@@ -21,7 +45,8 @@ func (s *Server) BackupRoot(b *backup.Backup) error {
 
 	// Try to notify the panel about the status of this backup. If for some reason this request
 	// fails, delete the archive from the daemon and return that error up the chain to the caller.
-	if notifyError := b.NotifyPanel(r, true); notifyError != nil {
+	ad := b.Details()
+	if notifyError := s.notifyPanelOfBackup(b.Identifier(), ad, true); notifyError != nil {
 		b.Remove()
 
 		return notifyError
@@ -31,9 +56,9 @@ func (s *Server) BackupRoot(b *backup.Backup) error {
 	// the frontend for the server.
 	s.Events().PublishJson(BackupCompletedEvent+":"+b.Uuid, map[string]interface{}{
 		"uuid":        b.Uuid,
-		"sha256_hash": r.Checksum,
-		"file_size":   r.Size,
+		"sha256_hash": ad.Checksum,
+		"file_size":   ad.Size,
 	})
 
 	return nil
-}
+}

server/backup/backup.go

@@ -1,24 +1,30 @@
 package backup
 
 import (
-	"crypto/sha256"
-	"github.com/pkg/errors"
 	"github.com/pterodactyl/wings/api"
-	"github.com/pterodactyl/wings/config"
-	"go.uber.org/zap"
-	"io"
-	"os"
-	"path"
 )
 
-type Backup struct {
-	// The UUID of this backup object. This must line up with a backup from
-	// the panel instance.
-	Uuid string `json:"uuid"`
+type Backup interface {
+	// Returns the UUID of this backup as tracked by the panel instance.
+	Identifier() string
 
-	// An array of files to ignore when generating this backup. This should be
-	// compatible with a standard .gitignore structure.
-	IgnoredFiles []string `json:"ignored_files"`
+	// Generates a backup in whatever the configured source for the specific
+	// implementation is.
+	Backup(dir string) error
+
+	// Returns a SHA256 checksum for the generated backup.
+	Checksum() ([]byte, error)
+
+	// Returns the size of the generated backup.
+	Size() (int64, error)
+
+	// Returns the path to the backup on the machine. This is not always the final
+	// storage location of the backup, simply the location we're using to store
+	// it until it is moved to the final spot.
+	Path() string
+
+	// Returns details about the archive.
+	Details() *ArchiveDetails
 }
 
 type ArchiveDetails struct {
@@ -33,71 +39,4 @@ func (ad *ArchiveDetails) ToRequest(successful bool) api.BackupRequest {
 		Size:       ad.Size,
 		Successful: successful,
 	}
-}
-
-// Returns the path for this specific backup.
-func (b *Backup) Path() string {
-	return path.Join(config.Get().System.BackupDirectory, b.Uuid+".tar.gz")
-}
-
-// Returns the SHA256 checksum of a backup.
-func (b *Backup) Checksum() ([]byte, error) {
-	h := sha256.New()
-
-	f, err := os.Open(b.Path())
-	if err != nil {
-		return []byte{}, errors.WithStack(err)
-	}
-	defer f.Close()
-
-	if _, err := io.Copy(h, f); err != nil {
-		return []byte{}, errors.WithStack(err)
-	}
-
-	return h.Sum(nil), nil
-}
-
-// Removes a backup from the system.
-func (b *Backup) Remove() error {
-	return os.Remove(b.Path())
-}
-
-// Notifies the panel of a backup's state and returns an error if one is encountered
-// while performing this action.
-func (b *Backup) NotifyPanel(ad *ArchiveDetails, successful bool) error {
-	r := api.NewRequester()
-
-	rerr, err := r.SendBackupStatus(b.Uuid, ad.ToRequest(successful))
-	if rerr != nil || err != nil {
-		if err != nil {
-			zap.S().Errorw(
-				"failed to notify panel of backup status due to internal code error",
-				zap.String("backup", b.Uuid),
-				zap.Error(err),
-			)
-
-			return err
-		}
-
-		zap.S().Warnw(rerr.String(), zap.String("backup", b.Uuid))
-
-		return errors.New(rerr.String())
-	}
-
-	return nil
-}
-
-// Ensures that the local backup destination for files exists.
-func (b *Backup) ensureLocalBackupLocation() error {
-	d := config.Get().System.BackupDirectory
-
-	if _, err := os.Stat(d); err != nil {
-		if !os.IsNotExist(err) {
-			return errors.WithStack(err)
-		}
-
-		return os.MkdirAll(d, 0700)
-	}
-
-	return nil
-}
+}

server/backup/backup_local.go

@@ -1,19 +1,35 @@
 package backup
 
 import (
+	"crypto/sha256"
 	"encoding/hex"
 	"github.com/mholt/archiver/v3"
 	"github.com/pkg/errors"
+	"github.com/pterodactyl/wings/config"
 	"go.uber.org/zap"
+	"io"
 	"os"
+	"path"
 	"strings"
 	"sync"
 )
 
+type LocalBackup struct {
+	// The UUID of this backup object. This must line up with a backup from
+	// the panel instance.
+	Uuid string `json:"uuid"`
+
+	// An array of files to ignore when generating this backup. This should be
+	// compatible with a standard .gitignore structure.
+	IgnoredFiles []string `json:"ignored_files"`
+}
+
+var _ Backup = (*LocalBackup)(nil)
+
 // Locates the backup for a server and returns the local path. This will obviously only
 // work if the backup was created as a local backup.
-func LocateLocal(uuid string) (*Backup, os.FileInfo, error) {
-	b := &Backup{
+func LocateLocal(uuid string) (*LocalBackup, os.FileInfo, error) {
+	b := &LocalBackup{
 		Uuid:         uuid,
 		IgnoredFiles: nil,
 	}
@@ -30,26 +46,73 @@ func LocateLocal(uuid string) (*Backup, os.FileInfo, error) {
 	return b, st, nil
 }
 
+func (b *LocalBackup) Identifier() string {
+	return b.Uuid
+}
+
+// Returns the path for this specific backup.
+func (b *LocalBackup) Path() string {
+	return path.Join(config.Get().System.BackupDirectory, b.Uuid+".tar.gz")
+}
+
+// Returns the SHA256 checksum of a backup.
+func (b *LocalBackup) Checksum() ([]byte, error) {
+	h := sha256.New()
+
+	f, err := os.Open(b.Path())
+	if err != nil {
+		return []byte{}, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	if _, err := io.Copy(h, f); err != nil {
+		return []byte{}, errors.WithStack(err)
+	}
+
+	return h.Sum(nil), nil
+}
+
+// Removes a backup from the system.
+func (b *LocalBackup) Remove() error {
+	return os.Remove(b.Path())
+}
+
 // Generates a backup of the selected files and pushes it to the defined location
 // for this instance.
-func (b *Backup) LocalBackup(dir string) (*ArchiveDetails, error) {
+func (b *LocalBackup) Backup(dir string) error {
 	if err := archiver.Archive([]string{dir}, b.Path()); err != nil {
 		if strings.HasPrefix(err.Error(), "file already exists") {
 			if rerr := os.Remove(b.Path()); rerr != nil {
-				return nil, errors.WithStack(rerr)
+				return errors.WithStack(rerr)
 			}
 
 			// Re-attempt this backup by calling it with the same information.
-			return b.LocalBackup(dir)
+			return b.Backup(dir)
 		}
 
 		// If there was some error with the archive, just go ahead and ensure the backup
 		// is completely destroyed at this point. Ignore any errors from this function.
 		os.Remove(b.Path())
 
-		return nil, err
+		return errors.WithStack(err)
 	}
 
+	return nil
+}
+
+// Return the size of the generated backup.
+func (b *LocalBackup) Size() (int64, error) {
+	st, err := os.Stat(b.Path())
+	if err != nil {
+		return 0, errors.WithStack(err)
+	}
+
+	return st.Size(), nil
+}
+
+// Returns details of the archive by utilizing two go-routines to get the checksum and
+// the size of the archive.
+func (b *LocalBackup) Details() *ArchiveDetails {
 	wg := sync.WaitGroup{}
 	wg.Add(2)
 
@@ -83,5 +146,20 @@ func (b *Backup) LocalBackup(dir string) (*ArchiveDetails, error) {
 	return &ArchiveDetails{
 		Checksum: checksum,
 		Size:     sz,
-	}, nil
+	}
 }
+
+// Ensures that the local backup destination for files exists.
+func (b *LocalBackup) ensureLocalBackupLocation() error {
+	d := config.Get().System.BackupDirectory
+
+	if _, err := os.Stat(d); err != nil {
+		if !os.IsNotExist(err) {
+			return errors.WithStack(err)
+		}
+
+		return os.MkdirAll(d, 0700)
+	}
+
+	return nil
+}

server/backup/backup_s3.go

@@ -0,0 +1,37 @@
+package backup
+
+type S3Backup struct {
+	// The UUID of this backup object. This must line up with a backup from
+	// the panel instance.
+	Uuid string
+
+	// An array of files to ignore when generating this backup. This should be
+	// compatible with a standard .gitignore structure.
+	IgnoredFiles []string
+}
+
+var _ Backup = (*S3Backup)(nil)
+
+func (s *S3Backup) Identifier() string {
+	return s.Uuid
+}
+
+func (s *S3Backup) Backup(dir string) error {
+	panic("implement me")
+}
+
+func (s *S3Backup) Checksum() ([]byte, error) {
+	return []byte(""), nil
+}
+
+func (s *S3Backup) Size() (int64, error) {
+	return 0, nil
+}
+
+func (s *S3Backup) Path() string {
+	return ""
+}
+
+func (s *S3Backup) Details() *ArchiveDetails {
+	return &ArchiveDetails{}
+}