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fs: add Directory Metadata flags for backends and interfaces
Add backend flags - ReadDirMetadata - WriteDirMetadata - WriteDirSetModTime - UserDirMetadata - DirModTimeUpdatesOnWrite Add Metadata/SetMetadata for directories. Add MkdirMetadata optional feature
This commit is contained in:
Nick Craig-Wood
parent
6da52d76a7
commit
a4cadd1128
@ -13,27 +13,32 @@ import (
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// Features describe the optional features of the Fs
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type Features struct {
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// Feature flags, whether Fs
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CaseInsensitive bool // has case insensitive files
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DuplicateFiles bool // allows duplicate files
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ReadMimeType bool // can read the mime type of objects
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WriteMimeType bool // can set the mime type of objects
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CanHaveEmptyDirectories bool // can have empty directories
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BucketBased bool // is bucket based (like s3, swift, etc.)
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BucketBasedRootOK bool // is bucket based and can use from root
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SetTier bool // allows set tier functionality on objects
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GetTier bool // allows to retrieve storage tier of objects
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ServerSideAcrossConfigs bool // can server-side copy between different remotes of the same type
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IsLocal bool // is the local backend
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SlowModTime bool // if calling ModTime() generally takes an extra transaction
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SlowHash bool // if calling Hash() generally takes an extra transaction
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ReadMetadata bool // can read metadata from objects
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WriteMetadata bool // can write metadata to objects
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UserMetadata bool // can read/write general purpose metadata
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FilterAware bool // can make use of filters if provided for listing
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PartialUploads bool // uploaded file can appear incomplete on the fs while it's being uploaded
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NoMultiThreading bool // set if can't have multiplethreads on one download open
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Overlay bool // this wraps one or more backends to add functionality
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ChunkWriterDoesntSeek bool // set if the chunk writer doesn't need to read the data more than once
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CaseInsensitive bool // has case insensitive files
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DuplicateFiles bool // allows duplicate files
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ReadMimeType bool // can read the mime type of objects
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WriteMimeType bool // can set the mime type of objects
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CanHaveEmptyDirectories bool // can have empty directories
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BucketBased bool // is bucket based (like s3, swift, etc.)
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BucketBasedRootOK bool // is bucket based and can use from root
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SetTier bool // allows set tier functionality on objects
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GetTier bool // allows to retrieve storage tier of objects
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ServerSideAcrossConfigs bool // can server-side copy between different remotes of the same type
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IsLocal bool // is the local backend
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SlowModTime bool // if calling ModTime() generally takes an extra transaction
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SlowHash bool // if calling Hash() generally takes an extra transaction
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ReadMetadata bool // can read metadata from objects
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WriteMetadata bool // can write metadata to objects
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UserMetadata bool // can read/write general purpose metadata
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ReadDirMetadata bool // can read metadata from directories (implements Directory.Metadata)
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WriteDirMetadata bool // can write metadata to directories (implements Directory.SetMetadata)
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WriteDirSetModTime bool // can write metadata to directories (implements Directory.SetModTime)
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UserDirMetadata bool // can read/write general purpose metadata to/from directories
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DirModTimeUpdatesOnWrite bool // indicate writing files to a directory updates its modtime
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FilterAware bool // can make use of filters if provided for listing
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PartialUploads bool // uploaded file can appear incomplete on the fs while it's being uploaded
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NoMultiThreading bool // set if can't have multiplethreads on one download open
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Overlay bool // this wraps one or more backends to add functionality
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ChunkWriterDoesntSeek bool // set if the chunk writer doesn't need to read the data more than once
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// Purge all files in the directory specified
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//
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@ -75,6 +80,15 @@ type Features struct {
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// If destination exists then return fs.ErrorDirExists
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DirMove func(ctx context.Context, src Fs, srcRemote, dstRemote string) error
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// MkdirMetadata makes the directory passed in as dir.
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//
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// It shouldn't return an error if it already exists.
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//
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// If the metadata is not nil it is set.
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//
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// It returns the directory that was created.
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MkdirMetadata func(ctx context.Context, dir string, metadata Metadata) (Directory, error)
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// ChangeNotify calls the passed function with a path
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// that has had changes. If the implementation
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// uses polling, it should adhere to the given interval.
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@ -274,6 +288,9 @@ func (ft *Features) Fill(ctx context.Context, f Fs) *Features {
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if do, ok := f.(DirMover); ok {
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ft.DirMove = do.DirMove
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}
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if do, ok := f.(MkdirMetadataer); ok {
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ft.MkdirMetadata = do.MkdirMetadata
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}
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if do, ok := f.(ChangeNotifier); ok {
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ft.ChangeNotify = do.ChangeNotify
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}
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@ -348,6 +365,11 @@ func (ft *Features) Mask(ctx context.Context, f Fs) *Features {
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ft.ReadMetadata = ft.ReadMetadata && mask.ReadMetadata
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ft.WriteMetadata = ft.WriteMetadata && mask.WriteMetadata
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ft.UserMetadata = ft.UserMetadata && mask.UserMetadata
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ft.ReadDirMetadata = ft.ReadDirMetadata && mask.ReadDirMetadata
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ft.WriteDirMetadata = ft.WriteDirMetadata && mask.WriteDirMetadata
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ft.WriteDirSetModTime = ft.WriteDirSetModTime && mask.WriteDirSetModTime
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ft.UserDirMetadata = ft.UserDirMetadata && mask.UserDirMetadata
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ft.DirModTimeUpdatesOnWrite = ft.DirModTimeUpdatesOnWrite && mask.DirModTimeUpdatesOnWrite
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ft.CanHaveEmptyDirectories = ft.CanHaveEmptyDirectories && mask.CanHaveEmptyDirectories
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ft.BucketBased = ft.BucketBased && mask.BucketBased
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ft.BucketBasedRootOK = ft.BucketBasedRootOK && mask.BucketBasedRootOK
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@ -374,6 +396,9 @@ func (ft *Features) Mask(ctx context.Context, f Fs) *Features {
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if mask.DirMove == nil {
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ft.DirMove = nil
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}
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if mask.MkdirMetadata == nil {
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ft.MkdirMetadata = nil
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}
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if mask.ChangeNotify == nil {
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ft.ChangeNotify = nil
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}
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@ -505,6 +530,18 @@ type DirMover interface {
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DirMove(ctx context.Context, src Fs, srcRemote, dstRemote string) error
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}
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// MkdirMetadataer is an optional interface for Fs
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type MkdirMetadataer interface {
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// MkdirMetadata makes the directory passed in as dir.
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//
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// It shouldn't return an error if it already exists.
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//
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// If the metadata is not nil it is set.
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//
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// It returns the directory that was created.
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MkdirMetadata(ctx context.Context, dir string, metadata Metadata) (Directory, error)
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}
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// ChangeNotifier is an optional interface for Fs
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type ChangeNotifier interface {
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// ChangeNotify calls the passed function with a path
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55
fs/types.go
55
fs/types.go
@ -144,6 +144,16 @@ type Directory interface {
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ID() string
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}
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// FullDirectory contains all the optional interfaces for Directory
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//
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// Use for checking making wrapping Directories implement everything
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type FullDirectory interface {
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Directory
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Metadataer
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SetMetadataer
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SetModTimer
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}
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// MimeTyper is an optional interface for Object
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type MimeTyper interface {
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// MimeType returns the content type of the Object if
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@ -183,14 +193,32 @@ type GetTierer interface {
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GetTier() string
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}
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// Metadataer is an optional interface for Object
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// Metadataer is an optional interface for DirEntry
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type Metadataer interface {
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// Metadata returns metadata for an object
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// Metadata returns metadata for an DirEntry
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//
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// It should return nil if there is no Metadata
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Metadata(ctx context.Context) (Metadata, error)
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}
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// SetMetadataer is an optional interface for DirEntry
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type SetMetadataer interface {
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// SetMetadata sets metadata for an DirEntry
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//
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// It should return fs.ErrorNotImplemented if it can't set metadata
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SetMetadata(ctx context.Context, metadata Metadata) error
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}
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// SetModTimer is an optional interface for Directory.
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//
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// Object implements this as part of its requires set of interfaces.
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type SetModTimer interface {
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// SetModTime sets the metadata on the DirEntry to set the modification date
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//
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// If there is any other metadata it does not overwrite it.
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SetModTime(ctx context.Context, t time.Time) error
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}
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// FullObjectInfo contains all the read-only optional interfaces
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//
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// Use for checking making wrapping ObjectInfos implement everything
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@ -248,6 +276,29 @@ func ObjectOptionalInterfaces(o Object) (supported, unsupported []string) {
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return supported, unsupported
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}
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// DirectoryOptionalInterfaces returns the names of supported and
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// unsupported optional interfaces for a Directory
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func DirectoryOptionalInterfaces(d Directory) (supported, unsupported []string) {
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store := func(ok bool, name string) {
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if ok {
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supported = append(supported, name)
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} else {
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unsupported = append(unsupported, name)
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}
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}
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_, ok := d.(Metadataer)
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store(ok, "Metadata")
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_, ok = d.(SetMetadataer)
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store(ok, "SetMetadata")
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_, ok = d.(SetModTimer)
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store(ok, "SetModTime")
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return supported, unsupported
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}
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// ListRCallback defines a callback function for ListR to use
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//
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// It is called for each tranche of entries read from the listing and
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