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dircache: simplify interface, fix corner cases and apply to backends

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Dircache was changed to:

- Remove special cases for the root directory
- Remove Fatal errors
- Call FindRoot on behalf of the user wherever possible
- Bring up to modern Go standards

Backends were changed to:

- Remove calls to FindRoot
- Change calls to FindRootAndPath to FindPath
- Don't make special cases for the root

This fixes several corner cases, for example removing a non existent
directory if FindRoot hasn't been called.
This commit is contained in:
Nick Craig-Wood 2020-05-11 17:24:37 +01:00
parent 81151523af
commit a8652e2252
14 changed files with 234 additions and 633 deletions
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63
backend/sugarsync/sugarsync.go
View file

@ -255,7 +255,7 @@ func shouldRetry(resp *http.Response, err error) (bool, error) {
// readMetaDataForPath reads the metadata from the path
func (f *Fs) readMetaDataForPath(ctx context.Context, path string) (info *api.File, err error) {
// defer fs.Trace(f, "path=%q", path)("info=%+v, err=%v", &info, &err)
leaf, directoryID, err := f.dirCache.FindRootAndPath(ctx, path, false)
leaf, directoryID, err := f.dirCache.FindPath(ctx, path, false)
if err != nil {
if err == fs.ErrorDirNotFound {
return nil, fs.ErrorObjectNotFound
@ -663,10 +663,6 @@ OUTER:
// This should return ErrDirNotFound if the directory isn't
// found.
func (f *Fs) List(ctx context.Context, dir string) (entries fs.DirEntries, err error) {
err = f.dirCache.FindRoot(ctx, false)
if err != nil {
return nil, err
}
directoryID, err := f.dirCache.FindDir(ctx, dir, false)
if err != nil {
return nil, err
@ -709,7 +705,7 @@ func (f *Fs) List(ctx context.Context, dir string) (entries fs.DirEntries, err e
// Used to create new objects
func (f *Fs) createObject(ctx context.Context, remote string, modTime time.Time, size int64) (o *Object, leaf string, directoryID string, err error) {
// Create the directory for the object if it doesn't exist
leaf, directoryID, err = f.dirCache.FindRootAndPath(ctx, remote, true)
leaf, directoryID, err = f.dirCache.FindPath(ctx, remote, true)
if err != nil {
return
}
@ -765,13 +761,7 @@ func (f *Fs) PutUnchecked(ctx context.Context, in io.Reader, src fs.ObjectInfo,
// Mkdir creates the container if it doesn't exist
func (f *Fs) Mkdir(ctx context.Context, dir string) error {
err := f.dirCache.FindRoot(ctx, true)
if err != nil {
return err
}
if dir != "" {
_, err = f.dirCache.FindDir(ctx, dir, true)
}
_, err := f.dirCache.FindDir(ctx, dir, true)
return err
}
@ -807,10 +797,6 @@ func (f *Fs) purgeCheck(ctx context.Context, dir string, check bool) error {
return errors.New("can't purge root directory")
}
dc := f.dirCache
err := dc.FindRoot(ctx, false)
if err != nil {
return err
}
directoryID, err := dc.FindDir(ctx, dir, false)
if err != nil {
return err
@ -1042,45 +1028,20 @@ func (f *Fs) DirMove(ctx context.Context, src fs.Fs, srcRemote, dstRemote string
return errors.New("can't move root directory")
}
// find the root src directory
err := srcFs.dirCache.FindRoot(ctx, false)
if err != nil {
return err
}
// find the root dst directory
if dstRemote != "" {
err = f.dirCache.FindRoot(ctx, true)
if err != nil {
return err
}
} else {
if f.dirCache.FoundRoot() {
return fs.ErrorDirExists
}
}
// Find ID of dst parent, creating subdirs if necessary
var leaf, directoryID string
findPath := dstRemote
if dstRemote == "" {
findPath = f.root
}
leaf, directoryID, err = f.dirCache.FindPath(ctx, findPath, true)
leaf, directoryID, err := f.dirCache.FindPath(ctx, dstRemote, true)
if err != nil {
return err
}
// Check destination does not exist
if dstRemote != "" {
_, err = f.dirCache.FindDir(ctx, dstRemote, false)
if err == fs.ErrorDirNotFound {
// OK
} else if err != nil {
return err
} else {
return fs.ErrorDirExists
}
_, err = f.dirCache.FindDir(ctx, dstRemote, false)
if err == fs.ErrorDirNotFound {
// OK
} else if err != nil {
return err
} else {
return fs.ErrorDirExists
}
// Find ID of src
@ -1289,7 +1250,7 @@ func (o *Object) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, op
remote := o.Remote()
// Create the directory for the object if it doesn't exist
leaf, directoryID, err := o.fs.dirCache.FindRootAndPath(ctx, remote, true)
leaf, directoryID, err := o.fs.dirCache.FindPath(ctx, remote, true)
if err != nil {
return err
}