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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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72
backend/amazonclouddrive/amazonclouddrive.go
View file

@ -514,10 +514,6 @@ func (f *Fs) listAll(dirID string, title string, directoriesOnly bool, filesOnly
// 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
@ -665,7 +661,7 @@ func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options .
return nil, err
}
// If not create it
leaf, directoryID, err := f.dirCache.FindRootAndPath(ctx, remote, true)
leaf, directoryID, err := f.dirCache.FindPath(ctx, remote, true)
if err != nil {
return nil, err
}
@ -696,13 +692,7 @@ func (f *Fs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options .
// 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
}
@ -724,10 +714,6 @@ func (f *Fs) Move(ctx context.Context, src fs.Object, remote string) (fs.Object,
}
// create the destination directory if necessary
err := f.dirCache.FindRoot(ctx, true)
if err != nil {
return nil, err
}
srcLeaf, srcDirectoryID, err := srcObj.fs.dirCache.FindPath(ctx, srcObj.remote, false)
if err != nil {
return nil, err
@ -797,54 +783,24 @@ 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
findPath := dstRemote
if dstRemote == "" {
findPath = f.root
}
dstLeaf, dstDirectoryID, err := f.dirCache.FindPath(ctx, findPath, true)
dstLeaf, dstDirectoryID, 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 parent
findPath = srcRemote
var srcDirectoryID string
if srcRemote == "" {
srcDirectoryID, err = srcFs.dirCache.RootParentID()
} else {
_, srcDirectoryID, err = srcFs.dirCache.FindPath(ctx, findPath, false)
}
_, srcDirectoryID, err := srcFs.dirCache.FindPath(ctx, srcRemote, false)
if err != nil {
return err
}
@ -890,10 +846,6 @@ 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
}
rootID, err := dc.FindDir(ctx, dir, false)
if err != nil {
return err
@ -1037,7 +989,7 @@ func (o *Object) readMetaData(ctx context.Context) (err error) {
if o.info != nil {
return nil
}
leaf, directoryID, err := o.fs.dirCache.FindRootAndPath(ctx, o.remote, false)
leaf, directoryID, err := o.fs.dirCache.FindPath(ctx, o.remote, false)
if err != nil {
if err == fs.ErrorDirNotFound {
return fs.ErrorObjectNotFound