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mirror of https://github.com/rclone/rclone synced 2024-11-28 06:41:41 +01:00
rclone/fs/object/object.go
Nick Craig-Wood faa58315c5 operations: ensure SrcFsType is set correctly when using --metadata-mapper
Before this change on files which have unknown length (like Google
Documents) the SrcFsType would be set to "memoryFs".

This change fixes the problem by getting the Copy function to pass the
src Fs into a variant of Rcat.

Fixes #7848
2024-05-20 18:16:54 +01:00

330 lines
8.5 KiB
Go

// Package object defines some useful Objects
package object
import (
"bytes"
"context"
"errors"
"io"
"time"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/hash"
)
// StaticObjectInfo is an ObjectInfo which can be constructed from scratch
type StaticObjectInfo struct {
remote string
modTime time.Time
size int64
storable bool
hashes map[hash.Type]string
fs fs.Info
meta fs.Metadata
mimeType string
}
// NewStaticObjectInfo returns a static ObjectInfo
// If hashes is nil and fs is not nil, the hash map will be replaced with
// empty hashes of the types supported by the fs.
func NewStaticObjectInfo(remote string, modTime time.Time, size int64, storable bool, hashes map[hash.Type]string, f fs.Info) *StaticObjectInfo {
info := &StaticObjectInfo{
remote: remote,
modTime: modTime,
size: size,
storable: storable,
hashes: hashes,
fs: f,
}
if f != nil && hashes == nil {
set := f.Hashes().Array()
info.hashes = make(map[hash.Type]string)
for _, ht := range set {
info.hashes[ht] = ""
}
}
if f == nil {
info.fs = MemoryFs
}
return info
}
// WithMetadata adds meta to the ObjectInfo
func (i *StaticObjectInfo) WithMetadata(meta fs.Metadata) *StaticObjectInfo {
i.meta = meta
return i
}
// WithMimeType adds meta to the ObjectInfo
func (i *StaticObjectInfo) WithMimeType(mimeType string) *StaticObjectInfo {
i.mimeType = mimeType
return i
}
// Fs returns read only access to the Fs that this object is part of
func (i *StaticObjectInfo) Fs() fs.Info {
return i.fs
}
// Remote returns the remote path
func (i *StaticObjectInfo) Remote() string {
return i.remote
}
// String returns a description of the Object
func (i *StaticObjectInfo) String() string {
return i.remote
}
// ModTime returns the modification date of the file
func (i *StaticObjectInfo) ModTime(ctx context.Context) time.Time {
return i.modTime
}
// Size returns the size of the file
func (i *StaticObjectInfo) Size() int64 {
return i.size
}
// Storable says whether this object can be stored
func (i *StaticObjectInfo) Storable() bool {
return i.storable
}
// Hash returns the requested hash of the contents
func (i *StaticObjectInfo) Hash(ctx context.Context, h hash.Type) (string, error) {
if len(i.hashes) == 0 {
return "", hash.ErrUnsupported
}
if hash, ok := i.hashes[h]; ok {
return hash, nil
}
return "", hash.ErrUnsupported
}
// Metadata on the object
func (i *StaticObjectInfo) Metadata(ctx context.Context) (fs.Metadata, error) {
return i.meta, nil
}
// MimeType returns the content type of the Object if
// known, or "" if not
func (i *StaticObjectInfo) MimeType(ctx context.Context) string {
return i.mimeType
}
// Check interfaces
var (
_ fs.ObjectInfo = (*StaticObjectInfo)(nil)
_ fs.Metadataer = (*StaticObjectInfo)(nil)
_ fs.MimeTyper = (*StaticObjectInfo)(nil)
)
// MemoryFs is an in memory Fs, it only supports FsInfo and Put
var MemoryFs memoryFs
// memoryFs is an in memory fs
type memoryFs struct{}
// Name of the remote (as passed into NewFs)
func (memoryFs) Name() string { return "memory" }
// Root of the remote (as passed into NewFs)
func (memoryFs) Root() string { return "" }
// String returns a description of the FS
func (memoryFs) String() string { return "memory" }
// Precision of the ModTimes in this Fs
func (memoryFs) Precision() time.Duration { return time.Nanosecond }
// Returns the supported hash types of the filesystem
func (memoryFs) Hashes() hash.Set { return hash.Supported() }
// Features returns the optional features of this Fs
func (memoryFs) Features() *fs.Features { return &fs.Features{} }
// 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 (memoryFs) List(ctx context.Context, dir string) (entries fs.DirEntries, err error) {
return nil, nil
}
// NewObject finds the Object at remote. If it can't be found
// it returns the error ErrorObjectNotFound.
func (memoryFs) NewObject(ctx context.Context, remote string) (fs.Object, error) {
return nil, fs.ErrorObjectNotFound
}
// 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 (memoryFs) Put(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (fs.Object, error) {
o := NewMemoryObject(src.Remote(), src.ModTime(ctx), nil)
return o, o.Update(ctx, in, src, options...)
}
// Mkdir makes the directory (container, bucket)
//
// Shouldn't return an error if it already exists
func (memoryFs) Mkdir(ctx context.Context, dir string) error {
return errors.New("memoryFs: can't make directory")
}
// Rmdir removes the directory (container, bucket) if empty
//
// Return an error if it doesn't exist or isn't empty
func (memoryFs) Rmdir(ctx context.Context, dir string) error {
return fs.ErrorDirNotFound
}
var _ fs.Fs = MemoryFs
// MemoryObject is an in memory object
type MemoryObject struct {
remote string
modTime time.Time
content []byte
meta fs.Metadata
fs fs.Fs
}
// NewMemoryObject returns an in memory Object with the modTime and content passed in
func NewMemoryObject(remote string, modTime time.Time, content []byte) *MemoryObject {
return &MemoryObject{
remote: remote,
modTime: modTime,
content: content,
fs: MemoryFs,
}
}
// WithMetadata adds meta to the MemoryObject
func (o *MemoryObject) WithMetadata(meta fs.Metadata) *MemoryObject {
o.meta = meta
return o
}
// Content returns the underlying buffer
func (o *MemoryObject) Content() []byte {
return o.content
}
// Fs returns read only access to the Fs that this object is part of
func (o *MemoryObject) Fs() fs.Info {
return o.fs
}
// SetFs sets the Fs that this memory object thinks it is part of
// It will ignore nil f
func (o *MemoryObject) SetFs(f fs.Fs) *MemoryObject {
if f != nil {
o.fs = f
}
return o
}
// Remote returns the remote path
func (o *MemoryObject) Remote() string {
return o.remote
}
// String returns a description of the Object
func (o *MemoryObject) String() string {
return o.remote
}
// ModTime returns the modification date of the file
func (o *MemoryObject) ModTime(ctx context.Context) time.Time {
return o.modTime
}
// Size returns the size of the file
func (o *MemoryObject) Size() int64 {
return int64(len(o.content))
}
// Storable says whether this object can be stored
func (o *MemoryObject) Storable() bool {
return true
}
// Hash returns the requested hash of the contents
func (o *MemoryObject) Hash(ctx context.Context, h hash.Type) (string, error) {
hash, err := hash.NewMultiHasherTypes(hash.Set(h))
if err != nil {
return "", err
}
_, err = hash.Write(o.content)
if err != nil {
return "", err
}
return hash.Sums()[h], nil
}
// SetModTime sets the metadata on the object to set the modification date
func (o *MemoryObject) SetModTime(ctx context.Context, modTime time.Time) error {
o.modTime = modTime
return nil
}
// Open opens the file for read. Call Close() on the returned io.ReadCloser
func (o *MemoryObject) Open(ctx context.Context, options ...fs.OpenOption) (io.ReadCloser, error) {
content := o.content
for _, option := range options {
switch x := option.(type) {
case *fs.RangeOption:
content = o.content[x.Start:x.End]
case *fs.SeekOption:
content = o.content[x.Offset:]
default:
if option.Mandatory() {
fs.Logf(o, "Unsupported mandatory option: %v", option)
}
}
}
return io.NopCloser(bytes.NewBuffer(content)), nil
}
// Update in to the object with the modTime given of the given size
//
// This re-uses the internal buffer if at all possible.
func (o *MemoryObject) Update(ctx context.Context, in io.Reader, src fs.ObjectInfo, options ...fs.OpenOption) (err error) {
size := src.Size()
if size == 0 {
o.content = nil
} else if size < 0 || int64(cap(o.content)) < size {
o.content, err = io.ReadAll(in)
} else {
o.content = o.content[:size]
_, err = io.ReadFull(in, o.content)
}
o.modTime = src.ModTime(ctx)
return err
}
// Remove this object
func (o *MemoryObject) Remove(ctx context.Context) error {
return errors.New("memoryObject.Remove not supported")
}
// Metadata on the object
func (o *MemoryObject) Metadata(ctx context.Context) (fs.Metadata, error) {
return o.meta, nil
}
// Check interfaces
var (
_ fs.Object = (*MemoryObject)(nil)
_ fs.Metadataer = (*MemoryObject)(nil)
)