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Initial untested pass at restoring from local backups

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This commit is contained in:
Dane Everitt 2021-01-16 18:06:22 -08:00
parent 6a286fb444
commit 7dd0acebc0
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GPG Key ID: EEA66103B3D71F53
6 changed files with 183 additions and 116 deletions
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124
router/router_server_backup.go
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@ -1,64 +1,105 @@
package router
import (
"fmt"
"net/http"
"os"
"emperror.dev/errors"
"github.com/apex/log"
"github.com/gin-gonic/gin"
"github.com/pterodactyl/wings/router/middleware"
"github.com/pterodactyl/wings/server"
"github.com/pterodactyl/wings/server/backup"
)
// Backs up a server.
// postServerBackup performs a backup against a given server instance using the
// provided backup adapter.
func postServerBackup(c *gin.Context) {
s := GetServer(c.Param("server"))
data := &backup.Request{}
// BindJSON sends 400 if the request fails, all we need to do is return
s := middleware.ExtractServer(c)
logger := middleware.ExtractLogger(c)
var data backup.Request
if err := c.BindJSON(&data); err != nil {
return
}
var adapter backup.BackupInterface
var err error
switch data.Adapter {
case backup.LocalBackupAdapter:
adapter, err = data.NewLocalBackup()
case backup.S3BackupAdapter:
adapter, err = data.NewS3Backup()
default:
err = errors.New(fmt.Sprintf("unknown backup adapter [%s] provided", data.Adapter))
return
}
adapter, err := data.AsBackup()
if err != nil {
NewServerError(err, s).Abort(c)
middleware.CaptureAndAbort(c, err)
return
}
// Attach the server ID to the backup log output for easier parsing.
// Attach the server ID and the request ID to the adapter log context for easier
// parsing in the logs.
adapter.WithLogContext(map[string]interface{}{
"server": s.Id(),
"server": s.Id(),
"request_id": c.GetString("request_id"),
})
go func(b backup.BackupInterface, serv *server.Server) {
if err := serv.Backup(b); err != nil {
serv.Log().WithField("error", errors.WithStackIf(err)).Error("failed to generate backup for server")
go func(b backup.BackupInterface, s *server.Server, logger *log.Entry) {
if err := s.Backup(b); err != nil {
logger.WithField("error", errors.WithStackIf(err)).Error("router: failed to generate server backup")
}
}(adapter, s)
}(adapter, s, logger)
c.Status(http.StatusAccepted)
}
// Deletes a local backup of a server. If the backup is not found on the machine just return
// a 404 error. The service calling this endpoint can make its own decisions as to how it wants
// to handle that response.
func deleteServerBackup(c *gin.Context) {
s := GetServer(c.Param("server"))
// postServerRestoreBackup handles restoring a backup for a server by downloading
// or finding the given backup on the system and then unpacking the archive into
// the server's data directory. If the TruncateDirectory field is provided and
// is true all of the files will be deleted for the server.
//
// This endpoint will block until the backup is fully restored allowing for a
// spinner to be displayed in the Panel UI effectively.
func postServerRestoreBackup(c *gin.Context) {
s := middleware.ExtractServer(c)
logger := middleware.ExtractLogger(c)
var data struct {
UUID string `binding:"required,uuid" json:"uuid"`
Adapter backup.AdapterType `binding:"required,oneof=wings s3" json:"adapter"`
TruncateDirectory bool `json:"truncate_directory"`
// A UUID is always required for this endpoint, however the download URL
// is only present when the given adapter type is s3.
DownloadUrl string `json:"download_url"`
}
if err := c.BindJSON(&data); err != nil {
return
}
if data.Adapter == backup.S3BackupAdapter && data.DownloadUrl == "" {
c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{"error": "The download_url field is required when the backup adapter is set to S3."})
return
}
logger.Info("processing server backup restore request")
if data.TruncateDirectory {
logger.Info(`recieved "truncate_directory" flag in request: deleting server files`)
if err := s.Filesystem().TruncateRootDirectory(); err != nil {
middleware.CaptureAndAbort(c, err)
return
}
}
// Now that we've cleaned up the data directory if necessary, grab the backup file
// and attempt to restore it into the server directory.
if data.Adapter == backup.LocalBackupAdapter {
b, _, err := backup.LocateLocal(data.UUID)
if err != nil {
middleware.CaptureAndAbort(c, err)
return
}
if err := b.Restore(s); err != nil {
middleware.CaptureAndAbort(c, err)
return
}
}
c.Status(http.StatusNoContent)
}
// deleteServerBackup deletes a local backup of a server. If the backup is not
// found on the machine just return a 404 error. The service calling this
// endpoint can make its own decisions as to how it wants to handle that
// response.
func deleteServerBackup(c *gin.Context) {
b, _, err := backup.LocateLocal(c.Param("backup"))
if err != nil {
// Just return from the function at this point if the backup was not located.
@ -68,20 +109,15 @@ func deleteServerBackup(c *gin.Context) {
})
return
}
NewServerError(err, s).Abort(c)
middleware.CaptureAndAbort(c, err)
return
}
if err := b.Remove(); err != nil {
// I'm not entirely sure how likely this is to happen, however if we did manage to locate
// the backup previously and it is now missing when we go to delete, just treat it as having
// been successful, rather than returning a 404.
if !errors.Is(err, os.ErrNotExist) {
NewServerError(err, s).Abort(c)
return
}
// I'm not entirely sure how likely this is to happen, however if we did manage to
// locate the backup previously and it is now missing when we go to delete, just
// treat it as having been successful, rather than returning a 404.
if err := b.Remove(); err != nil && !errors.Is(err, os.ErrNotExist) {
middleware.CaptureAndAbort(c, err)
return
}
c.Status(http.StatusNoContent)
}

40
server/backup/backup.go
View File

@ -3,13 +3,15 @@ package backup
import (
"crypto/sha1"
"encoding/hex"
"github.com/apex/log"
"github.com/pterodactyl/wings/api"
"github.com/pterodactyl/wings/config"
"io"
"os"
"path"
"sync"
"emperror.dev/errors"
"github.com/apex/log"
"github.com/pterodactyl/wings/api"
"github.com/pterodactyl/wings/config"
)
type AdapterType string
@ -19,6 +21,38 @@ const (
S3BackupAdapter AdapterType = "s3"
)
type Request struct {
Adapter AdapterType `json:"adapter"`
Uuid string `json:"uuid"`
Ignore string `json:"ignore"`
}
// AsBackup returns a new backup adapter based on the request value.
func (r *Request) AsBackup() (BackupInterface, error) {
var adapter BackupInterface
switch r.Adapter {
case LocalBackupAdapter:
adapter = &LocalBackup{
Backup{
Uuid: r.Uuid,
Ignore: r.Ignore,
adapter: LocalBackupAdapter,
},
}
case S3BackupAdapter:
adapter = &S3Backup{
Backup: Backup{
Uuid: r.Uuid,
Ignore: r.Ignore,
adapter: S3BackupAdapter,
},
}
default:
return nil, errors.New("server/backup: unsupported adapter type: " + string(r.Adapter))
}
return adapter, nil
}
type ArchiveDetails struct {
Checksum string `json:"checksum"`
ChecksumType string `json:"checksum_type"`

31
server/backup/backup_local.go
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@ -2,8 +2,11 @@ package backup
import (
"errors"
"github.com/pterodactyl/wings/server/filesystem"
"os"
"github.com/mholt/archiver/v3"
"github.com/pterodactyl/wings/server"
"github.com/pterodactyl/wings/server/filesystem"
)
type LocalBackup struct {
@ -12,8 +15,8 @@ type LocalBackup struct {
var _ BackupInterface = (*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.
// LocateLocal finds 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) (*LocalBackup, os.FileInfo, error) {
b := &LocalBackup{
Backup{
@ -34,18 +37,18 @@ func LocateLocal(uuid string) (*LocalBackup, os.FileInfo, error) {
return b, st, nil
}
// Removes a backup from the system.
// Remove removes a backup from the system.
func (b *LocalBackup) Remove() error {
return os.Remove(b.Path())
}
// Attaches additional context to the log output for this backup.
// WithLogContext attaches additional context to the log output for this backup.
func (b *LocalBackup) WithLogContext(c map[string]interface{}) {
b.logContext = c
}
// Generates a backup of the selected files and pushes it to the defined location
// for this instance.
// Generate generates a backup of the selected files and pushes it to the
// defined location for this instance.
func (b *LocalBackup) Generate(basePath, ignore string) (*ArchiveDetails, error) {
a := &filesystem.Archive{
BasePath: basePath,
@ -60,3 +63,17 @@ func (b *LocalBackup) Generate(basePath, ignore string) (*ArchiveDetails, error)
return b.Details(), nil
}
// Restore restores a backup to the provided server's root data directory.
func (b *LocalBackup) Restore(s *server.Server) error {
return archiver.Walk(b.Path(), func(f archiver.File) error {
if f.IsDir() {
return nil
}
name, err := filesystem.ExtractArchiveSourceName(f, "/")
if err != nil {
return err
}
return s.Filesystem().Writefile(name, f)
})
}

42
server/backup/backup_request.go
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@ -1,42 +0,0 @@
package backup
import (
"errors"
"fmt"
)
type Request struct {
Adapter AdapterType `json:"adapter"`
Uuid string `json:"uuid"`
Ignore string `json:"ignore"`
}
// Generates a new local backup struct.
func (r *Request) NewLocalBackup() (*LocalBackup, error) {
if r.Adapter != LocalBackupAdapter {
return nil, errors.New(fmt.Sprintf("cannot create local backup using [%s] adapter", r.Adapter))
}
return &LocalBackup{
Backup{
Uuid: r.Uuid,
Ignore: r.Ignore,
adapter: LocalBackupAdapter,
},
}, nil
}
// Generates a new S3 backup struct.
func (r *Request) NewS3Backup() (*S3Backup, error) {
if r.Adapter != S3BackupAdapter {
return nil, errors.New(fmt.Sprintf("cannot create s3 backup using [%s] adapter", r.Adapter))
}
return &S3Backup{
Backup: Backup{
Uuid: r.Uuid,
Ignore: r.Ignore,
adapter: S3BackupAdapter,
},
}, nil
}

39
server/filesystem/decompress.go
View File

@ -74,23 +74,10 @@ func (fs *Filesystem) DecompressFile(dir string, file string) error {
if f.IsDir() {
return nil
}
var name string
switch s := f.Sys().(type) {
case *tar.Header:
name = s.Name
case *gzip.Header:
name = s.Name
case *zip.FileHeader:
name = s.Name
default:
return &Error{
code: ErrCodeUnknownError,
resolved: filepath.Join(dir, f.Name()),
err: errors.New(fmt.Sprintf("could not parse underlying data source with type: %s", reflect.TypeOf(s).String())),
}
name, err := ExtractArchiveSourceName(f, dir)
if err != nil {
return err
}
p := filepath.Join(dir, name)
// If it is ignored, just don't do anything with the file and skip over it.
if err := fs.IsIgnored(p); err != nil {
@ -109,3 +96,23 @@ func (fs *Filesystem) DecompressFile(dir string, file string) error {
}
return nil
}
// ExtractArchiveSourceName looks for the provided archiver.File's name if it is
// a type that is supported, otherwise it returns an error to the caller.
func ExtractArchiveSourceName(f archiver.File, dir string) (name string, err error) {
switch s := f.Sys().(type) {
case *tar.Header:
name = s.Name
case *gzip.Header:
name = s.Name
case *zip.FileHeader:
name = s.Name
default:
err = &Error{
code: ErrCodeUnknownError,
resolved: filepath.Join(dir, f.Name()),
err: errors.New(fmt.Sprintf("could not parse underlying data source with type: %s", reflect.TypeOf(s).String())),
}
}
return name, err
}

21
server/filesystem/filesystem.go
View File

@ -11,6 +11,7 @@ import (
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"emperror.dev/errors"
@ -124,7 +125,8 @@ func (fs *Filesystem) Readfile(p string, w io.Writer) error {
}
// Writefile writes a file to the system. If the file does not already exist one
// will be created.
// will be created. This will also properly recalculate the disk space used by
// the server when writing new files or modifying existing ones.
func (fs *Filesystem) Writefile(p string, r io.Reader) error {
cleaned, err := fs.SafePath(p)
if err != nil {
@ -365,8 +367,21 @@ func (fs *Filesystem) Copy(p string) error {
return fs.Writefile(path.Join(relative, n), source)
}
// Deletes a file or folder from the system. Prevents the user from accidentally
// (or maliciously) removing their root server data directory.
// TruncateRootDirectory removes _all_ files and directories from a server's
// data directory and resets the used disk space to zero.
func (fs *Filesystem) TruncateRootDirectory() error {
if err := os.RemoveAll(fs.Path()); err != nil {
return err
}
if err := os.Mkdir(fs.Path(), 0755); err != nil {
return err
}
atomic.StoreInt64(&fs.diskUsed, 0)
return nil
}
// Delete removes a file or folder from the system. Prevents the user from
// accidentally (or maliciously) removing their root server data directory.
func (fs *Filesystem) Delete(p string) error {
wg := sync.WaitGroup{}
// This is one of the few (only?) places in the codebase where we're explicitly not using