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package rclone_backend
import (
"bytes"
"context"
"fmt"
"github.com/rclone/rclone/fs/config/configfile"
"github.com/seaweedfs/seaweedfs/weed/util"
"io"
"os"
"text/template"
"time"
"github.com/google/uuid"
_ "github.com/rclone/rclone/backend/all"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/accounting"
"github.com/rclone/rclone/fs/object"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb/volume_server_pb"
"github.com/seaweedfs/seaweedfs/weed/storage/backend"
)
func init() {
backend.BackendStorageFactories["rclone"] = &RcloneBackendFactory{}
configfile.Install()
}
type RcloneBackendFactory struct {
}
func (factory *RcloneBackendFactory) StorageType() backend.StorageType {
return "rclone"
}
func (factory *RcloneBackendFactory) BuildStorage(configuration backend.StringProperties, configPrefix string, id string) (backend.BackendStorage, error) {
return newRcloneBackendStorage(configuration, configPrefix, id)
}
type RcloneBackendStorage struct {
id string
remoteName string
keyTemplate *template.Template
keyTemplateText string
fs fs.Fs
}
func newRcloneBackendStorage(configuration backend.StringProperties, configPrefix string, id string) (s *RcloneBackendStorage, err error) {
s = &RcloneBackendStorage{}
s.id = id
s.remoteName = configuration.GetString(configPrefix + "remote_name")
s.keyTemplateText = configuration.GetString(configPrefix + "key_template")
s.keyTemplate, err = template.New("keyTemplate").Parse(s.keyTemplateText)
if err != nil {
return
}
ctx := context.TODO()
accounting.Start(ctx)
fsPath := fmt.Sprintf("%s:", s.remoteName)
s.fs, err = fs.NewFs(ctx, fsPath)
if err != nil {
glog.Errorf("failed to instantiate Rclone filesystem: %s", err)
return
}
glog.V(0).Infof("created backend storage rclone.%s for remote name %s", s.id, s.remoteName)
return
}
func (s *RcloneBackendStorage) ToProperties() map[string]string {
m := make(map[string]string)
m["remote_name"] = s.remoteName
if len(s.keyTemplateText) > 0 {
m["key_template"] = s.keyTemplateText
}
return m
}
func formatKey(key string, storage RcloneBackendStorage) (fKey string, err error) {
var b bytes.Buffer
if len(storage.keyTemplateText) == 0 {
fKey = key
} else {
err = storage.keyTemplate.Execute(&b, key)
if err == nil {
fKey = b.String()
}
}
return
}
func (s *RcloneBackendStorage) NewStorageFile(key string, tierInfo *volume_server_pb.VolumeInfo) backend.BackendStorageFile {
f := &RcloneBackendStorageFile{
backendStorage: s,
key: key,
tierInfo: tierInfo,
}
return f
}
func (s *RcloneBackendStorage) CopyFile(f *os.File, fn func(progressed int64, percentage float32) error) (key string, size int64, err error) {
randomUuid, err := uuid.NewRandom()
if err != nil {
return key, 0, err
}
key = randomUuid.String()
key, err = formatKey(key, *s)
if err != nil {
return key, 0, err
}
glog.V(1).Infof("copy dat file of %s to remote rclone.%s as %s", f.Name(), s.id, key)
util.Retry("upload via Rclone", func() error {
size, err = uploadViaRclone(s.fs, f.Name(), key, fn)
return err
})
return
}
func uploadViaRclone(rfs fs.Fs, filename string, key string, fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {
ctx := context.TODO()
file, err := os.Open(filename)
defer func(file *os.File) {
err := file.Close()
if err != nil {
return
}
}(file)
if err != nil {
return 0, err
}
stat, err := file.Stat()
if err != nil {
return 0, err
}
info := object.NewStaticObjectInfo(key, stat.ModTime(), stat.Size(), true, nil, rfs)
tr := accounting.NewStats(ctx).NewTransfer(info)
defer tr.Done(ctx, err)
acc := tr.Account(ctx, file)
pr := ProgressReader{acc: acc, tr: tr, fn: fn}
obj, err := rfs.Put(ctx, &pr, info)
if err != nil {
return 0, err
}
return obj.Size(), err
}
func (s *RcloneBackendStorage) DownloadFile(filename string, key string, fn func(progressed int64, percentage float32) error) (size int64, err error) {
glog.V(1).Infof("download dat file of %s from remote rclone.%s as %s", filename, s.id, key)
util.Retry("download via Rclone", func() error {
size, err = downloadViaRclone(s.fs, filename, key, fn)
return err
})
return
}
func downloadViaRclone(fs fs.Fs, filename string, key string, fn func(progressed int64, percentage float32) error) (fileSize int64, err error) {
ctx := context.TODO()
obj, err := fs.NewObject(ctx, key)
if err != nil {
return 0, err
}
rc, err := obj.Open(ctx)
defer func(rc io.ReadCloser) {
err := rc.Close()
if err != nil {
return
}
}(rc)
if err != nil {
return 0, err
}
file, err := os.Create(filename)
defer func(file *os.File) {
err := file.Close()
if err != nil {
return
}
}(file)
tr := accounting.NewStats(ctx).NewTransfer(obj)
defer tr.Done(ctx, err)
acc := tr.Account(ctx, rc)
pr := ProgressReader{acc: acc, tr: tr, fn: fn}
written, err := io.Copy(file, &pr)
if err != nil {
return 0, err
}
return written, nil
}
func (s *RcloneBackendStorage) DeleteFile(key string) (err error) {
glog.V(1).Infof("delete dat file %s from remote", key)
util.Retry("delete via Rclone", func() error {
err = deleteViaRclone(s.fs, key)
return err
})
return
}
func deleteViaRclone(fs fs.Fs, key string) (err error) {
ctx := context.TODO()
obj, err := fs.NewObject(ctx, key)
if err != nil {
return err
}
return obj.Remove(ctx)
}
type RcloneBackendStorageFile struct {
backendStorage *RcloneBackendStorage
key string
tierInfo *volume_server_pb.VolumeInfo
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) ReadAt(p []byte, off int64) (n int, err error) {
ctx := context.TODO()
obj, err := rcloneBackendStorageFile.backendStorage.fs.NewObject(ctx, rcloneBackendStorageFile.key)
if err != nil {
return 0, err
}
opt := fs.RangeOption{Start: off, End: off + int64(len(p)) - 1}
rc, err := obj.Open(ctx, &opt)
defer func(rc io.ReadCloser) {
err := rc.Close()
if err != nil {
return
}
}(rc)
if err != nil {
return 0, err
}
return io.ReadFull(rc, p)
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) WriteAt(p []byte, off int64) (n int, err error) {
panic("not implemented")
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) Truncate(off int64) error {
panic("not implemented")
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) Close() error {
return nil
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) GetStat() (datSize int64, modTime time.Time, err error) {
files := rcloneBackendStorageFile.tierInfo.GetFiles()
if len(files) == 0 {
err = fmt.Errorf("remote file info not found")
return
}
datSize = int64(files[0].FileSize)
modTime = time.Unix(int64(files[0].ModifiedTime), 0)
return
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) Name() string {
return rcloneBackendStorageFile.key
}
func (rcloneBackendStorageFile RcloneBackendStorageFile) Sync() error {
return nil
}
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