rclone/backend/combine/combine.go

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2022-09-20 06:54:47 +00:00
// Package combine implements a backend to combine multiple remotes in a directory tree
package combine
/*
Have API to add/remove branches in the combine
*/
import (
"context"
"errors"
"fmt"
"io"
"path"
"strings"
"sync"
"time"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/cache"
"github.com/rclone/rclone/fs/config/configmap"
"github.com/rclone/rclone/fs/config/configstruct"
"github.com/rclone/rclone/fs/hash"
"github.com/rclone/rclone/fs/operations"
"github.com/rclone/rclone/fs/walk"
"golang.org/x/sync/errgroup"
)
// Register with Fs
func init() {
fsi := &fs.RegInfo{
Name: "combine",
Description: "Combine several remotes into one",
NewFs: NewFs,
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MetadataInfo: &fs.MetadataInfo{
Help: `Any metadata supported by the underlying remote is read and written.`,
},
Options: []fs.Option{{
Name: "upstreams",
Help: `Upstreams for combining
These should be in the form
dir=remote:path dir2=remote2:path
Where before the = is specified the root directory and after is the remote to
put there.
Embedded spaces can be added using quotes
"dir=remote:path with space" "dir2=remote2:path with space"
`,
Required: true,
Default: fs.SpaceSepList(nil),
}},
}
fs.Register(fsi)
}
// Options defines the configuration for this backend
type Options struct {
Upstreams fs.SpaceSepList `config:"upstreams"`
}
// Fs represents a combine of upstreams
type Fs struct {
name string // name of this remote
features *fs.Features // optional features
opt Options // options for this Fs
root string // the path we are working on
hashSet hash.Set // common hashes
when time.Time // directory times
upstreams map[string]*upstream // map of upstreams
}
// adjustment stores the info to add a prefix to a path or chop characters off
type adjustment struct {
root string
rootSlash string
mountpoint string
mountpointSlash string
}
// newAdjustment makes a new path adjustment adjusting between mountpoint and root
//
// mountpoint is the point the upstream is mounted and root is the combine root
func newAdjustment(root, mountpoint string) (a adjustment) {
return adjustment{
root: root,
rootSlash: root + "/",
mountpoint: mountpoint,
mountpointSlash: mountpoint + "/",
}
}
var errNotUnderRoot = errors.New("file not under root")
// do makes the adjustment on s, mapping an upstream path into a combine path
func (a *adjustment) do(s string) (string, error) {
absPath := join(a.mountpoint, s)
if a.root == "" {
return absPath, nil
}
if absPath == a.root {
return "", nil
}
if !strings.HasPrefix(absPath, a.rootSlash) {
return "", errNotUnderRoot
}
return absPath[len(a.rootSlash):], nil
}
// undo makes the adjustment on s, mapping a combine path into an upstream path
func (a *adjustment) undo(s string) (string, error) {
absPath := join(a.root, s)
if absPath == a.mountpoint {
return "", nil
}
if !strings.HasPrefix(absPath, a.mountpointSlash) {
return "", errNotUnderRoot
}
return absPath[len(a.mountpointSlash):], nil
}
// upstream represents an upstream Fs
type upstream struct {
f fs.Fs
parent *Fs
dir string // directory the upstream is mounted
pathAdjustment adjustment // how to fiddle with the path
}
// Create an upstream from the directory it is mounted on and the remote
func (f *Fs) newUpstream(ctx context.Context, dir, remote string) (*upstream, error) {
uFs, err := cache.Get(ctx, remote)
if err == fs.ErrorIsFile {
return nil, fmt.Errorf("can't combine files yet, only directories %q: %w", remote, err)
}
if err != nil {
return nil, fmt.Errorf("failed to create upstream %q: %w", remote, err)
}
u := &upstream{
f: uFs,
parent: f,
dir: dir,
pathAdjustment: newAdjustment(f.root, dir),
}
cache.PinUntilFinalized(u.f, u)
return u, nil
}
// NewFs constructs an Fs from the path.
//
// The returned Fs is the actual Fs, referenced by remote in the config
func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (outFs fs.Fs, err error) {
// defer log.Trace(nil, "name=%q, root=%q, m=%v", name, root, m)("f=%+v, err=%v", &outFs, &err)
// Parse config into Options struct
opt := new(Options)
err = configstruct.Set(m, opt)
if err != nil {
return nil, err
}
// Backward compatible to old config
if len(opt.Upstreams) == 0 {
return nil, errors.New("combine can't point to an empty upstream - check the value of the upstreams setting")
}
for _, u := range opt.Upstreams {
if strings.HasPrefix(u, name+":") {
return nil, errors.New("can't point combine remote at itself - check the value of the upstreams setting")
}
}
isDir := false
for strings.HasSuffix(root, "/") {
root = root[:len(root)-1]
isDir = true
}
f := &Fs{
name: name,
root: root,
opt: *opt,
upstreams: make(map[string]*upstream, len(opt.Upstreams)),
when: time.Now(),
}
g, gCtx := errgroup.WithContext(ctx)
var mu sync.Mutex
for _, upstream := range opt.Upstreams {
upstream := upstream
g.Go(func() (err error) {
equal := strings.IndexRune(upstream, '=')
if equal < 0 {
return fmt.Errorf("no \"=\" in upstream definition %q", upstream)
}
dir, remote := upstream[:equal], upstream[equal+1:]
if dir == "" {
return fmt.Errorf("empty dir in upstream definition %q", upstream)
}
if remote == "" {
return fmt.Errorf("empty remote in upstream definition %q", upstream)
}
if strings.ContainsRune(dir, '/') {
return fmt.Errorf("dirs can't contain / (yet): %q", dir)
}
u, err := f.newUpstream(gCtx, dir, remote)
if err != nil {
return err
}
mu.Lock()
if _, found := f.upstreams[dir]; found {
err = fmt.Errorf("duplicate directory name %q", dir)
} else {
f.upstreams[dir] = u
}
mu.Unlock()
return err
})
}
err = g.Wait()
if err != nil {
return nil, err
}
// check features
var features = (&fs.Features{
CaseInsensitive: true,
DuplicateFiles: false,
ReadMimeType: true,
WriteMimeType: true,
CanHaveEmptyDirectories: true,
BucketBased: true,
SetTier: true,
GetTier: true,
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ReadMetadata: true,
WriteMetadata: true,
UserMetadata: true,
PartialUploads: true,
}).Fill(ctx, f)
canMove := true
for _, u := range f.upstreams {
features = features.Mask(ctx, u.f) // Mask all upstream fs
if !operations.CanServerSideMove(u.f) {
canMove = false
}
}
// We can move if all remotes support Move or Copy
if canMove {
features.Move = f.Move
}
// Enable ListR when upstreams either support ListR or is local
// But not when all upstreams are local
if features.ListR == nil {
for _, u := range f.upstreams {
if u.f.Features().ListR != nil {
features.ListR = f.ListR
} else if !u.f.Features().IsLocal {
features.ListR = nil
break
}
}
}
// Enable Purge when any upstreams support it
if features.Purge == nil {
for _, u := range f.upstreams {
if u.f.Features().Purge != nil {
features.Purge = f.Purge
break
}
}
}
// Enable Shutdown when any upstreams support it
if features.Shutdown == nil {
for _, u := range f.upstreams {
if u.f.Features().Shutdown != nil {
features.Shutdown = f.Shutdown
break
}
}
}
// Enable DirCacheFlush when any upstreams support it
if features.DirCacheFlush == nil {
for _, u := range f.upstreams {
if u.f.Features().DirCacheFlush != nil {
features.DirCacheFlush = f.DirCacheFlush
break
}
}
}
// Enable CleanUp when any upstreams support it
if features.CleanUp == nil {
for _, u := range f.upstreams {
if u.f.Features().CleanUp != nil {
features.CleanUp = f.CleanUp
break
}
}
}
// Enable ChangeNotify when any upstreams support it
if features.ChangeNotify == nil {
for _, u := range f.upstreams {
if u.f.Features().ChangeNotify != nil {
features.ChangeNotify = f.ChangeNotify
break
}
}
}
// show that we wrap other backends
features.Overlay = true
f.features = features
// Get common intersection of hashes
var hashSet hash.Set
var first = true
for _, u := range f.upstreams {
if first {
hashSet = u.f.Hashes()
first = false
} else {
hashSet = hashSet.Overlap(u.f.Hashes())
}
}
f.hashSet = hashSet
// Check to see if the root is actually a file
if f.root != "" && !isDir {
_, err := f.NewObject(ctx, "")
if err != nil {
if err == fs.ErrorObjectNotFound || err == fs.ErrorNotAFile || err == fs.ErrorIsDir {
// File doesn't exist or is a directory so return old f
return f, nil
}
return nil, err
}
// Check to see if the root path is actually an existing file
f.root = path.Dir(f.root)
if f.root == "." {
f.root = ""
}
// Adjust path adjustment to remove leaf
for _, u := range f.upstreams {
u.pathAdjustment = newAdjustment(f.root, u.dir)
}
return f, fs.ErrorIsFile
}
return f, nil
}
// Run a function over all the upstreams in parallel
func (f *Fs) multithread(ctx context.Context, fn func(context.Context, *upstream) error) error {
g, gCtx := errgroup.WithContext(ctx)
for _, u := range f.upstreams {
u := u
g.Go(func() (err error) {
return fn(gCtx, u)
})
}
return g.Wait()
}
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// join the elements together but unlike path.Join return empty string
func join(elem ...string) string {
result := path.Join(elem...)
if result == "." {
return ""
}
if len(result) > 0 && result[0] == '/' {
result = result[1:]
}
return result
}
// find the upstream for the remote passed in, returning the upstream and the adjusted path
func (f *Fs) findUpstream(remote string) (u *upstream, uRemote string, err error) {
// defer log.Trace(remote, "")("f=%v, uRemote=%q, err=%v", &u, &uRemote, &err)
for _, u := range f.upstreams {
uRemote, err = u.pathAdjustment.undo(remote)
if err == nil {
return u, uRemote, nil
}
}
return nil, "", fmt.Errorf("combine for remote %q: %w", remote, fs.ErrorDirNotFound)
}
// Name of the remote (as passed into NewFs)
func (f *Fs) Name() string {
return f.name
}
// Root of the remote (as passed into NewFs)
func (f *Fs) Root() string {
return f.root
}
// String converts this Fs to a string
func (f *Fs) String() string {
return fmt.Sprintf("combine root '%s'", f.root)
}
// Features returns the optional features of this Fs
func (f *Fs) Features() *fs.Features {
return f.features
}
// Rmdir removes the root directory of the Fs object
func (f *Fs) Rmdir(ctx context.Context, dir string) error {
// The root always exists
if f.root == "" && dir == "" {
return nil
}
u, uRemote, err := f.findUpstream(dir)
if err != nil {
return err
}
return u.f.Rmdir(ctx, uRemote)
}
// Hashes returns hash.HashNone to indicate remote hashing is unavailable
func (f *Fs) Hashes() hash.Set {
return f.hashSet
}
// Mkdir makes the root directory of the Fs object
func (f *Fs) Mkdir(ctx context.Context, dir string) error {
// The root always exists
if f.root == "" && dir == "" {
return nil
}
u, uRemote, err := f.findUpstream(dir)
if err != nil {
return err
}
return u.f.Mkdir(ctx, uRemote)
}
// purge the upstream or fallback to a slow way
func (u *upstream) purge(ctx context.Context, dir string) (err error) {
if do := u.f.Features().Purge; do != nil {
err = do(ctx, dir)
} else {
err = operations.Purge(ctx, u.f, dir)
}
return err
}
// Purge all files in the directory
//
// Implement this if you have a way of deleting all the files
// quicker than just running Remove() on the result of List()
//
// Return an error if it doesn't exist
func (f *Fs) Purge(ctx context.Context, dir string) error {
if f.root == "" && dir == "" {
return f.multithread(ctx, func(ctx context.Context, u *upstream) error {
return u.purge(ctx, "")
})
}
u, uRemote, err := f.findUpstream(dir)
if err != nil {
return err
}
return u.purge(ctx, uRemote)
}
// Copy src to this remote using server-side copy operations.
//
// This is stored with the remote path given.
//
// It returns the destination Object and a possible error.
//
// Will only be called if src.Fs().Name() == f.Name()
//
// If it isn't possible then return fs.ErrorCantCopy
func (f *Fs) Copy(ctx context.Context, src fs.Object, remote string) (fs.Object, error) {
srcObj, ok := src.(*Object)
if !ok {
fs.Debugf(src, "Can't copy - not same remote type")
return nil, fs.ErrorCantCopy
}
dstU, dstRemote, err := f.findUpstream(remote)
if err != nil {
return nil, err
}
do := dstU.f.Features().Copy
if do == nil {
return nil, fs.ErrorCantCopy
}
o, err := do(ctx, srcObj.Object, dstRemote)
if err != nil {
return nil, err
}
return dstU.newObject(o), nil
}
// Move src to this remote using server-side move operations.
//
// This is stored with the remote path given.
//
// It returns the destination Object and a possible error.
//
// Will only be called if src.Fs().Name() == f.Name()
//
// If it isn't possible then return fs.ErrorCantMove
func (f *Fs) Move(ctx context.Context, src fs.Object, remote string) (fs.Object, error) {
srcObj, ok := src.(*Object)
if !ok {
fs.Debugf(src, "Can't move - not same remote type")
return nil, fs.ErrorCantMove
}
dstU, dstRemote, err := f.findUpstream(remote)
if err != nil {
return nil, err
}
do := dstU.f.Features().Move
useCopy := false
if do == nil {
do = dstU.f.Features().Copy
if do == nil {
return nil, fs.ErrorCantMove
}
useCopy = true
}
o, err := do(ctx, srcObj.Object, dstRemote)
if err != nil {
return nil, err
}
// If did Copy then remove the source object
if useCopy {
err = srcObj.Remove(ctx)
if err != nil {
return nil, err
}
}
return dstU.newObject(o), nil
}
// DirMove moves src, srcRemote to this remote at dstRemote
// using server-side move operations.
//
// Will only be called if src.Fs().Name() == f.Name()
//
// If it isn't possible then return fs.ErrorCantDirMove
//
// If destination exists then return fs.ErrorDirExists
func (f *Fs) DirMove(ctx context.Context, src fs.Fs, srcRemote, dstRemote string) (err error) {
// defer log.Trace(f, "src=%v, srcRemote=%q, dstRemote=%q", src, srcRemote, dstRemote)("err=%v", &err)
srcFs, ok := src.(*Fs)
if !ok {
fs.Debugf(src, "Can't move directory - not same remote type")
return fs.ErrorCantDirMove
}
dstU, dstURemote, err := f.findUpstream(dstRemote)
if err != nil {
return err
}
srcU, srcURemote, err := srcFs.findUpstream(srcRemote)
if err != nil {
return err
}
do := dstU.f.Features().DirMove
if do == nil {
return fs.ErrorCantDirMove
}
fs.Logf(dstU.f, "srcU.f=%v, srcURemote=%q, dstURemote=%q", srcU.f, srcURemote, dstURemote)
return do(ctx, srcU.f, srcURemote, dstURemote)
}
// ChangeNotify calls the passed function with a path
// that has had changes. If the implementation
// uses polling, it should adhere to the given interval.
// At least one value will be written to the channel,
// specifying the initial value and updated values might
// follow. A 0 Duration should pause the polling.
// The ChangeNotify implementation must empty the channel
// regularly. When the channel gets closed, the implementation
// should stop polling and release resources.
func (f *Fs) ChangeNotify(ctx context.Context, notifyFunc func(string, fs.EntryType), ch <-chan time.Duration) {
var uChans []chan time.Duration
for _, u := range f.upstreams {
u := u
if do := u.f.Features().ChangeNotify; do != nil {
ch := make(chan time.Duration)
uChans = append(uChans, ch)
wrappedNotifyFunc := func(path string, entryType fs.EntryType) {
newPath, err := u.pathAdjustment.do(path)
if err != nil {
fs.Logf(f, "ChangeNotify: unable to process %q: %s", path, err)
return
}
fs.Debugf(f, "ChangeNotify: path %q entryType %d", newPath, entryType)
notifyFunc(newPath, entryType)
}
do(ctx, wrappedNotifyFunc, ch)
}
}
go func() {
for i := range ch {
for _, c := range uChans {
c <- i
}
}
for _, c := range uChans {
close(c)
}
}()
}
// DirCacheFlush resets the directory cache - used in testing
// as an optional interface
func (f *Fs) DirCacheFlush() {
ctx := context.Background()
_ = f.multithread(ctx, func(ctx context.Context, u *upstream) error {
if do := u.f.Features().DirCacheFlush; do != nil {
do()
}
return nil
})
}
func (f *Fs) put(ctx context.Context, in io.Reader, src fs.ObjectInfo, stream bool, options ...fs.OpenOption) (fs.Object, error) {
srcPath := src.Remote()
u, uRemote, err := f.findUpstream(srcPath)
if err != nil {
return nil, err
}
uSrc := fs.NewOverrideRemote(src, uRemote)
var o fs.Object
if stream {
o, err = u.f.Features().PutStream(ctx, in, uSrc, options...)
} else {
o, err = u.f.Put(ctx, in, uSrc, options...)
}
if err != nil {
return nil, err
}
return u.newObject(o), nil
}
// Put in to the remote path with the modTime given of the given size
//
// May create the object even if it returns an error - if so
// will return the object and the error, otherwise will return
// nil and the error
func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) {
o, err := f.NewObject(ctx, src.Remote())
switch err {
case nil:
return o, o.Update(ctx, in, src, options...)
case fs.ErrorObjectNotFound:
return f.put(ctx, in, src, false, options...)
default:
return nil, err
}
}
// PutStream uploads to the remote path with the modTime given of indeterminate size
//
// May create the object even if it returns an error - if so
// will return the object and the error, otherwise will return
// nil and the error
func (f *Fs) PutStream(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) {
o, err := f.NewObject(ctx, src.Remote())
switch err {
case nil:
return o, o.Update(ctx, in, src, options...)
case fs.ErrorObjectNotFound:
return f.put(ctx, in, src, true, options...)
default:
return nil, err
}
}
// About gets quota information from the Fs
func (f *Fs) About(ctx context.Context) (*fs.Usage, error) {
usage := &fs.Usage{
Total: new(int64),
Used: new(int64),
Trashed: new(int64),
Other: new(int64),
Free: new(int64),
Objects: new(int64),
}
for _, u := range f.upstreams {
doAbout := u.f.Features().About
if doAbout == nil {
continue
}
usg, err := doAbout(ctx)
if errors.Is(err, fs.ErrorDirNotFound) {
continue
}
if err != nil {
return nil, err
}
if usg.Total != nil && usage.Total != nil {
*usage.Total += *usg.Total
} else {
usage.Total = nil
}
if usg.Used != nil && usage.Used != nil {
*usage.Used += *usg.Used
} else {
usage.Used = nil
}
if usg.Trashed != nil && usage.Trashed != nil {
*usage.Trashed += *usg.Trashed
} else {
usage.Trashed = nil
}
if usg.Other != nil && usage.Other != nil {
*usage.Other += *usg.Other
} else {
usage.Other = nil
}
if usg.Free != nil && usage.Free != nil {
*usage.Free += *usg.Free
} else {
usage.Free = nil
}
if usg.Objects != nil && usage.Objects != nil {
*usage.Objects += *usg.Objects
} else {
usage.Objects = nil
}
}
return usage, nil
}
// Wraps entries for this upstream
func (u *upstream) wrapEntries(ctx context.Context, entries fs.DirEntries) (fs.DirEntries, error) {
for i, entry := range entries {
switch x := entry.(type) {
case fs.Object:
entries[i] = u.newObject(x)
case fs.Directory:
newDir := fs.NewDirCopy(ctx, x)
newPath, err := u.pathAdjustment.do(newDir.Remote())
if err != nil {
return nil, err
}
newDir.SetRemote(newPath)
entries[i] = newDir
default:
return nil, fmt.Errorf("unknown entry type %T", entry)
}
}
return entries, nil
}
// List the objects and directories in dir into entries. The
// entries can be returned in any order but should be for a
// complete directory.
//
// dir should be "" to list the root, and should not have
// trailing slashes.
//
// This should return ErrDirNotFound if the directory isn't
// found.
func (f *Fs) List(ctx context.Context, dir string) (entries fs.DirEntries, err error) {
// defer log.Trace(f, "dir=%q", dir)("entries = %v, err=%v", &entries, &err)
if f.root == "" && dir == "" {
entries = make(fs.DirEntries, 0, len(f.upstreams))
for combineDir := range f.upstreams {
d := fs.NewDir(combineDir, f.when)
entries = append(entries, d)
}
return entries, nil
}
u, uRemote, err := f.findUpstream(dir)
if err != nil {
return nil, err
}
entries, err = u.f.List(ctx, uRemote)
if err != nil {
return nil, err
}
return u.wrapEntries(ctx, entries)
}
// ListR lists the objects and directories of the Fs starting
// from dir recursively into out.
//
// dir should be "" to start from the root, and should not
// have trailing slashes.
//
// This should return ErrDirNotFound if the directory isn't
// found.
//
// It should call callback for each tranche of entries read.
// These need not be returned in any particular order. If
// callback returns an error then the listing will stop
// immediately.
//
// Don't implement this unless you have a more efficient way
// of listing recursively that doing a directory traversal.
func (f *Fs) ListR(ctx context.Context, dir string, callback fs.ListRCallback) (err error) {
// defer log.Trace(f, "dir=%q, callback=%v", dir, callback)("err=%v", &err)
if f.root == "" && dir == "" {
rootEntries, err := f.List(ctx, "")
if err != nil {
return err
}
err = callback(rootEntries)
if err != nil {
return err
}
var mu sync.Mutex
syncCallback := func(entries fs.DirEntries) error {
mu.Lock()
defer mu.Unlock()
return callback(entries)
}
err = f.multithread(ctx, func(ctx context.Context, u *upstream) error {
return f.ListR(ctx, u.dir, syncCallback)
})
if err != nil {
return err
}
return nil
}
u, uRemote, err := f.findUpstream(dir)
if err != nil {
return err
}
wrapCallback := func(entries fs.DirEntries) error {
entries, err := u.wrapEntries(ctx, entries)
if err != nil {
return err
}
return callback(entries)
}
if do := u.f.Features().ListR; do != nil {
err = do(ctx, uRemote, wrapCallback)
} else {
err = walk.ListR(ctx, u.f, uRemote, true, -1, walk.ListAll, wrapCallback)
}
if err == fs.ErrorDirNotFound {
err = nil
}
return err
}
// NewObject creates a new remote combine file object
func (f *Fs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
u, uRemote, err := f.findUpstream(remote)
if err != nil {
return nil, err
}
if uRemote == "" || strings.HasSuffix(uRemote, "/") {
return nil, fs.ErrorIsDir
}
o, err := u.f.NewObject(ctx, uRemote)
if err != nil {
return nil, err
}
return u.newObject(o), nil
}
// Precision is the greatest Precision of all upstreams
func (f *Fs) Precision() time.Duration {
var greatestPrecision time.Duration
for _, u := range f.upstreams {
uPrecision := u.f.Precision()
if uPrecision > greatestPrecision {
greatestPrecision = uPrecision
}
}
return greatestPrecision
}
// Shutdown the backend, closing any background tasks and any
// cached connections.
func (f *Fs) Shutdown(ctx context.Context) error {
return f.multithread(ctx, func(ctx context.Context, u *upstream) error {
if do := u.f.Features().Shutdown; do != nil {
return do(ctx)
}
return nil
})
}
// PublicLink generates a public link to the remote path (usually readable by anyone)
func (f *Fs) PublicLink(ctx context.Context, remote string, expire fs.Duration, unlink bool) (string, error) {
u, uRemote, err := f.findUpstream(remote)
if err != nil {
return "", err
}
do := u.f.Features().PublicLink
if do == nil {
return "", fs.ErrorNotImplemented
}
return do(ctx, uRemote, expire, unlink)
}
// Put in to the remote path with the modTime given of the given size
//
// May create the object even if it returns an error - if so
// will return the object and the error, otherwise will return
// nil and the error
//
// May create duplicates or return errors if src already
// exists.
func (f *Fs) PutUnchecked(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) {
srcPath := src.Remote()
u, uRemote, err := f.findUpstream(srcPath)
if err != nil {
return nil, err
}
do := u.f.Features().PutUnchecked
if do == nil {
return nil, fs.ErrorNotImplemented
}
uSrc := fs.NewOverrideRemote(src, uRemote)
return do(ctx, in, uSrc, options...)
}
// MergeDirs merges the contents of all the directories passed
// in into the first one and rmdirs the other directories.
func (f *Fs) MergeDirs(ctx context.Context, dirs []fs.Directory) error {
if len(dirs) == 0 {
return nil
}
var (
u *upstream
uDirs []fs.Directory
)
for _, dir := range dirs {
uNew, uDir, err := f.findUpstream(dir.Remote())
if err != nil {
return err
}
if u == nil {
u = uNew
} else if u != uNew {
return fmt.Errorf("can't merge dirctories from different upstreams")
}
uDirs = append(uDirs, fs.NewOverrideDirectory(dir, uDir))
}
do := u.f.Features().MergeDirs
if do == nil {
return fs.ErrorNotImplemented
}
return do(ctx, uDirs)
}
// CleanUp the trash in the Fs
//
// Implement this if you have a way of emptying the trash or
// otherwise cleaning up old versions of files.
func (f *Fs) CleanUp(ctx context.Context) error {
return f.multithread(ctx, func(ctx context.Context, u *upstream) error {
if do := u.f.Features().CleanUp; do != nil {
return do(ctx)
}
return nil
})
}
// OpenWriterAt opens with a handle for random access writes
//
// Pass in the remote desired and the size if known.
//
// It truncates any existing object
func (f *Fs) OpenWriterAt(ctx context.Context, remote string, size int64) (fs.WriterAtCloser, error) {
u, uRemote, err := f.findUpstream(remote)
if err != nil {
return nil, err
}
do := u.f.Features().OpenWriterAt
if do == nil {
return nil, fs.ErrorNotImplemented
}
return do(ctx, uRemote, size)
}
// Object describes a wrapped Object
//
// This is a wrapped Object which knows its path prefix
type Object struct {
fs.Object
u *upstream
}
func (u *upstream) newObject(o fs.Object) *Object {
return &Object{
Object: o,
u: u,
}
}
// Fs returns read only access to the Fs that this object is part of
func (o *Object) Fs() fs.Info {
return o.u.parent
}
// String returns the remote path
func (o *Object) String() string {
return o.Remote()
}
// Remote returns the remote path
func (o *Object) Remote() string {
newPath, err := o.u.pathAdjustment.do(o.Object.String())
if err != nil {
fs.Errorf(o.Object, "Bad object: %v", err)
return err.Error()
}
return newPath
}
// MimeType returns the content type of the Object if known
func (o *Object) MimeType(ctx context.Context) (mimeType string) {
if do, ok := o.Object.(fs.MimeTyper); ok {
mimeType = do.MimeType(ctx)
}
return mimeType
}
// UnWrap returns the Object that this Object is wrapping or
// nil if it isn't wrapping anything
func (o *Object) UnWrap() fs.Object {
return o.Object
}
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// GetTier returns storage tier or class of the Object
func (o *Object) GetTier() string {
do, ok := o.Object.(fs.GetTierer)
if !ok {
return ""
}
return do.GetTier()
}
// ID returns the ID of the Object if known, or "" if not
func (o *Object) ID() string {
do, ok := o.Object.(fs.IDer)
if !ok {
return ""
}
return do.ID()
}
// Metadata returns metadata for an object
//
// It should return nil if there is no Metadata
func (o *Object) Metadata(ctx context.Context) (fs.Metadata, error) {
do, ok := o.Object.(fs.Metadataer)
if !ok {
return nil, nil
}
return do.Metadata(ctx)
}
// SetTier performs changing storage tier of the Object if
// multiple storage classes supported
func (o *Object) SetTier(tier string) error {
do, ok := o.Object.(fs.SetTierer)
if !ok {
return errors.New("underlying remote does not support SetTier")
}
return do.SetTier(tier)
}
// Check the interfaces are satisfied
var (
_ fs.Fs = (*Fs)(nil)
_ fs.Purger = (*Fs)(nil)
_ fs.PutStreamer = (*Fs)(nil)
_ fs.Copier = (*Fs)(nil)
_ fs.Mover = (*Fs)(nil)
_ fs.DirMover = (*Fs)(nil)
_ fs.DirCacheFlusher = (*Fs)(nil)
_ fs.ChangeNotifier = (*Fs)(nil)
_ fs.Abouter = (*Fs)(nil)
_ fs.ListRer = (*Fs)(nil)
_ fs.Shutdowner = (*Fs)(nil)
_ fs.PublicLinker = (*Fs)(nil)
_ fs.PutUncheckeder = (*Fs)(nil)
_ fs.MergeDirser = (*Fs)(nil)
_ fs.CleanUpper = (*Fs)(nil)
_ fs.OpenWriterAter = (*Fs)(nil)
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_ fs.FullObject = (*Object)(nil)
)