extern/rclone
1
0
Fork 0
mirror of https://github.com/rclone/rclone.git synced 2024-12-31 19:40:25 +01:00
Code Issues Packages Projects Releases Wiki Activity

vfs: chunked files which can be read and written at will

Browse Source 
This introduces the vfs/chunked library which can open a file like
object which is stored in parts on the remote. This can be read and
written to anywhere and at any time.
This commit is contained in:
Nick Craig-Wood 2017-11-30 17:00:42 +00:00
parent 2f9c2cf75e
commit 9fb0afad88
2 changed files with 891 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

439
vfs/chunked/chunked.go Normal file
View File

@ -0,0 +1,439 @@
// Package chunked provides an infinite chunked file abstraction from
// the VFS.
//
// This can be used in the vfs layer to make chunked files, and in
// something like rclone serve nbd.
package chunked
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io"
stdfs "io/fs"
"os"
"path"
"sync"
"time"
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/log"
"github.com/rclone/rclone/fs/operations"
"github.com/rclone/rclone/vfs"
"github.com/rclone/rclone/vfs/vfscommon"
)
const (
infoName = "info.json" // name of chunk info file
minChunkBits = 4 // min size of chunk is 16 bytes
maxChunkBits = 30 // max size of chunk is 1 GB
defaultChunkBits = 16 // 64k chunks by default
maxBufferChunks = 1024 // default number of chunks in read buffer
maxDirtyChunks = 128 // default number of chuns in write buffer
currentInfoVersion = 1 // version of the info file
)
// Info is serialized to the directory
type Info struct {
Version int // version of chunk file
Comment string // note about this file
Size int64 // current size of the file
ChunkBits uint // number of bits in the chunk
ChunkSize int // must be power of two (1 << ChunkBits)
}
// File stores info about the file
type File struct {
// these are read-only after creation so no locking required
vfs *vfs.VFS // underlying VFS
dir string // path to directory
chunkSize int // size of a chunk 1 << info.ChunkBits
mask int64 // mask an offset onto a chunk boundary ^(chunkSize-1)
chunkMask int64 // mask an offset into an intra chunk index (chunkSize-1)
mu sync.Mutex // lock for info
opens int // number of file handles open on this File
accessed time.Time // time file was last opened or closed
valid bool // true if the info is valid
info Info // info about the file
infoRemote string // path to info object
sizeChanged time.Time // when the size was changed
}
// New creates a new chunked file at dir.
func New(vfs *vfs.VFS, dir string) (cf *File) {
cf = &File{
vfs: vfs,
dir: dir,
infoRemote: path.Join(dir, infoName),
}
return cf
}
// Open - open an existing file or create a new one with bits chunksize
//
// if create is not set then it will error if the file does not exist
//
// if bits is 0 then it uses the default value.
//
// Call Close() to show that you are no longer using this file.
//
// Open and Close can be called multiple times on one *File
func (cf *File) Open(create bool, bits uint) (err error) {
cf.mu.Lock()
defer cf.mu.Unlock()
if bits == 0 {
bits = defaultChunkBits
}
if bits < minChunkBits {
return fmt.Errorf("chunk bits %d too small, must be >= %d", bits, minChunkBits)
}
if bits > maxChunkBits {
return fmt.Errorf("chunk bits %d too large, must be <= %d", bits, maxChunkBits)
}
if !cf.valid {
err = cf._readInfo()
if err != nil && (!create || !errors.Is(err, stdfs.ErrNotExist)) {
return fmt.Errorf("failed to open chunked file: read info failed: %w", err)
}
if err != nil {
cf.info = Info{
Size: 0,
ChunkBits: bits,
ChunkSize: 1 << bits,
Version: currentInfoVersion,
Comment: "rclone chunked file",
}
err = cf._writeInfo()
if err != nil && err != fs.ErrorObjectNotFound {
return fmt.Errorf("failed to open chunked file: write info failed: %w", err)
}
}
cf.valid = true
cf._updateChunkBits()
}
// Show another open
cf.accessed = time.Now()
cf.opens++
return nil
}
// Close this *File
//
// It also writes the size out if it has changed and flushes the
// buffers.
//
// Open and Close can be called multiple times on one *File
func (cf *File) Close() error {
cf.mu.Lock()
defer cf.mu.Unlock()
cf.accessed = time.Now()
if cf.opens <= 0 {
return errors.New("unbalanced open/close on File")
}
cf.opens--
return cf._sync()
}
// sets all the constants which depend on cf.info.ChunkBits
//
// call with mu held
func (cf *File) _updateChunkBits() {
cf.chunkSize = 1 << cf.info.ChunkBits
cf.chunkMask = int64(cf.chunkSize - 1)
cf.mask = ^cf.chunkMask
cf.info.ChunkSize = cf.chunkSize
}
// makeChunkFileName makes a remote name for the chunk
func (cf *File) makeChunkFileName(off int64) string {
if off&cf.chunkMask != 0 {
panic("makeChunkFileName: non chunk aligned offset")
}
cf.mu.Lock()
off >>= cf.info.ChunkBits
Bits := 64 - cf.info.ChunkBits
cf.mu.Unlock()
Bytes := Bits >> 3
// round up
if Bits&7 != 0 {
Bytes += 1
}
// Format to correct number of bytes
// offS = "01234567"
offS := fmt.Sprintf("%0*X", 2*Bytes, off)
// Now interpolated / except for the last
var out bytes.Buffer
if cf.dir != "" {
out.WriteString(cf.dir)
out.WriteRune('/')
}
// out = "path/to/file/"
for i := uint(0); i < Bytes-1; i++ {
out.WriteString(offS[i*2 : i*2+2])
out.WriteRune('/')
}
// out = "path/to/file/01/23/45/"
// now add full string
out.WriteString(offS)
// out = "path/to/file/01/23/45/01234567"
out.WriteString(".bin")
// out = "path/to/file/01/23/45/01234567.bin"
return out.String()
}
// readInfo writes the ChunkInfo to the object
//
// if it wasn't found then it returns fs.ErrorObjectNotFound
//
// Call with mu held
func (cf *File) _readInfo() (err error) {
content, err := cf.vfs.ReadFile(cf.infoRemote)
if err != nil {
return fmt.Errorf("failed to find chunk info file %q: %w", cf.infoRemote, err)
}
err = json.Unmarshal(content, &cf.info)
if err != nil {
return fmt.Errorf("failed to decode chunk info file %q: %w", cf.infoRemote, err)
}
if cf.info.Version > currentInfoVersion {
return fmt.Errorf("don't understand version %d info files (current version in %d)", cf.info.Version, currentInfoVersion)
}
if cf.info.ChunkBits < minChunkBits {
return fmt.Errorf("chunk bits %d too small, must be >= %d", cf.info.ChunkBits, minChunkBits)
}
if cf.info.ChunkBits > maxChunkBits {
return fmt.Errorf("chunk bits %d too large, must be <= %d", cf.info.ChunkBits, maxChunkBits)
}
return nil
}
// _writeInfo writes the ChunkInfo to the object
//
// call with mu held
func (cf *File) _writeInfo() (err error) {
content, err := json.Marshal(&cf.info)
if err != nil {
return fmt.Errorf("failed to encode chunk info file %q: %w", cf.infoRemote, err)
}
err = cf.vfs.WriteFile(cf.infoRemote, content, 0600)
if err != nil {
return fmt.Errorf("failed to write chunk info file %q: %w", cf.infoRemote, err)
}
// show size is now unchanged
cf.sizeChanged = time.Time{}
return nil
}
// _writeSize writes the ChunkInfo if the size has changed
//
// call with mu held
func (cf *File) _writeSize() (err error) {
if cf.sizeChanged.IsZero() {
return nil
}
return cf._writeInfo()
}
// zeroBytes zeroes n bytes at the start of buf, or until the end of
// buf, whichever comes first. It returns the number of bytes it
// wrote.
func zeroBytes(buf []byte, n int) int {
if n > len(buf) {
n = len(buf)
}
for i := 0; i < n; i++ {
buf[i] = 0
}
return n
}
// Read bytes from the chunk at chunkStart from offset off in the
// chunk.
//
// Return number of bytes read
func (cf *File) chunkReadAt(b []byte, chunkStart int64, off int64) (n int, err error) {
defer log.Trace(nil, "size=%d, chunkStart=%016x, off=%d", len(b), chunkStart, off)("n=%d, err=%v", &n, &err)
fileName := cf.makeChunkFileName(chunkStart)
if endPos := int64(cf.chunkSize) - off; endPos < int64(len(b)) {
b = b[:endPos]
}
file, err := cf.vfs.Open(fileName)
// If file doesn't exist, it is zero
if errors.Is(err, stdfs.ErrNotExist) {
return zeroBytes(b, len(b)), nil
} else if err != nil {
return 0, err
}
defer fs.CheckClose(file, &err)
n, err = file.ReadAt(b, off)
if err == io.EOF && off+int64(n) >= int64(cf.chunkSize) {
err = nil
}
return
}
// ReadAt reads len(b) bytes from the File starting at byte offset off. It
// returns the number of bytes read and the error, if any. ReadAt always
// returns a non-nil error when n < len(b). At end of file, that error is
// io.EOF.
func (cf *File) ReadAt(b []byte, off int64) (n int, err error) {
cf.mu.Lock()
size := cf.info.Size
cf.mu.Unlock()
if off >= size {
return 0, io.EOF
}
isEOF := false
if bytesToEnd := size - off; bytesToEnd < int64(len(b)) {
b = b[:bytesToEnd]
isEOF = true
}
for n < len(b) {
chunkStart := off & cf.mask
end := n + cf.chunkSize
if end > len(b) {
end = len(b)
}
var nn int
nn, err = cf.chunkReadAt(b[n:end], chunkStart, off-chunkStart)
n += nn
off += int64(nn)
if err != nil {
break
}
}
if err == nil && isEOF {
err = io.EOF
}
return
}
// Write b to the chunk at chunkStart at offset off
//
// Return number of bytes written
func (cf *File) chunkWriteAt(b []byte, chunkStart int64, off int64) (n int, err error) {
defer log.Trace(nil, "size=%d, chunkStart=%016x, off=%d", len(b), chunkStart, off)("n=%d, err=%v", &n, &err)
fileName := cf.makeChunkFileName(chunkStart)
err = cf.vfs.MkdirAll(path.Dir(fileName), 0700)
if err != nil {
return 0, err
}
file, err := cf.vfs.OpenFile(fileName, os.O_WRONLY|os.O_CREATE, 0600)
if err != nil {
return 0, err
}
defer fs.CheckClose(file, &err)
// Make the file full size if we can
if cf.vfs.Opt.CacheMode >= vfscommon.CacheModeWrites {
err = file.Truncate(int64(cf.chunkSize))
if err != nil {
return 0, err
}
}
if endPos := int64(cf.chunkSize) - off; endPos < int64(len(b)) {
b = b[:endPos]
}
return file.WriteAt(b, off)
}
// WriteAt writes len(b) bytes to the File starting at byte offset off. It
// returns the number of bytes written and an error, if any. WriteAt returns a
// non-nil error when n != len(b).
func (cf *File) WriteAt(b []byte, off int64) (n int, err error) {
for n < len(b) {
chunkStart := off & cf.mask
var nn int
end := n + cf.chunkSize
if end > len(b) {
end = len(b)
}
nn, err = cf.chunkWriteAt(b[n:end], chunkStart, off-chunkStart)
n += nn
off += int64(nn)
if err != nil {
break
}
}
// Write new size if needed
cf.mu.Lock()
size := cf.info.Size
if off > size {
cf.info.Size = off // extend the file if necessary
cf.sizeChanged = time.Now()
}
cf.mu.Unlock()
return
}
// Size reads the current size of the file
func (cf *File) Size() int64 {
cf.mu.Lock()
if !cf.valid {
err := cf._readInfo()
if err != nil {
fs.Errorf(cf.dir, "Failed to read size: %v", err)
}
}
size := cf.info.Size
cf.mu.Unlock()
return size
}
// Truncate sets the current size of the file
//
// FIXME it doesn't delete any data...
func (cf *File) Truncate(size int64) error {
cf.mu.Lock()
if cf.info.Size != size {
cf.info.Size = size
cf.sizeChanged = time.Now()
}
cf.mu.Unlock()
return nil
}
// _sync writes any pending data to disk by flushing the write queue
//
// call with the lock held
func (cf *File) _sync() error {
err := cf._writeSize()
// FIXME need a VFS function to flush everything to disk
return err
}
// Sync writes any pending data to disk by flushing the write queue
func (cf *File) Sync() error {
cf.mu.Lock()
defer cf.mu.Unlock()
return cf._sync()
}
// Remove removes all the data in the file
func (cf *File) Remove() error {
cf.mu.Lock()
defer cf.mu.Unlock()
if !cf.valid {
return nil
}
if cf.opens > 0 {
return errors.New("can't delete chunked file when it is open")
}
cf.valid = false
_ = cf._sync()
// Purge all the files
// FIXME should get this into the VFS as RemoveAll
err := operations.Purge(context.TODO(), cf.vfs.Fs(), cf.dir)
cf.vfs.FlushDirCache()
return err
}

452
vfs/chunked/chunked_test.go Normal file
View File

@ -0,0 +1,452 @@
package chunked
import (
"context"
"errors"
"fmt"
"io"
stdfs "io/fs"
"testing"
"time"
_ "github.com/rclone/rclone/backend/all" // import all the file systems
"github.com/rclone/rclone/fs"
"github.com/rclone/rclone/fs/object"
"github.com/rclone/rclone/fs/operations"
"github.com/rclone/rclone/fstest"
"github.com/rclone/rclone/vfs"
"github.com/rclone/rclone/vfs/vfscommon"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// TestMain drives the tests
func TestMain(m *testing.M) {
fstest.TestMain(m)
}
func TestChunkFileName(t *testing.T) {
cf := &File{
dir: "path/to/dir",
}
for _, test := range []struct {
bits uint
off int64
want string
panic bool
}{
{
8,
0,
"path/to/dir/00/00/00/00/00/00/00000000000000.bin",
false,
},
{
8,
0x123456789ABCDE00,
"path/to/dir/12/34/56/78/9A/BC/123456789ABCDE.bin",
false,
},
{
8,
0x123456789ABCDE80,
"",
true,
},
{
12,
0,
"path/to/dir/00/00/00/00/00/00/00000000000000.bin",
false,
},
{
12,
0x123456789ABCD000,
"path/to/dir/01/23/45/67/89/AB/0123456789ABCD.bin",
false,
},
{
15,
0,
"path/to/dir/00/00/00/00/00/00/00000000000000.bin",
false,
},
{
15,
0x123456789ABCC000,
"",
true,
},
{
15,
0x123456789ABC0000,
"path/to/dir/00/24/68/AC/F1/35/002468ACF13578.bin",
false,
},
{
16,
0,
"path/to/dir/00/00/00/00/00/000000000000.bin",
false,
},
{
16,
0x123456789ABC8000,
"",
true,
},
{
16,
0x123456789ABC0000,
"path/to/dir/12/34/56/78/9A/123456789ABC.bin",
false,
},
{
20,
0,
"path/to/dir/00/00/00/00/00/000000000000.bin",
false,
},
{
23,
0,
"path/to/dir/00/00/00/00/00/000000000000.bin",
false,
},
{
24,
0,
"path/to/dir/00/00/00/00/0000000000.bin",
false,
},
{
24,
0x7EFDFCFBFA000000,
"path/to/dir/7E/FD/FC/FB/7EFDFCFBFA.bin",
false,
},
{
28,
0x7EFDFCFBF0000000,
"path/to/dir/07/EF/DF/CF/07EFDFCFBF.bin",
false,
},
} {
cf.info.ChunkBits = test.bits
cf._updateChunkBits()
what := fmt.Sprintf("bits=%d, off=0x%X, panic=%v", test.bits, test.off, test.panic)
if !test.panic {
got := cf.makeChunkFileName(test.off)
assert.Equal(t, test.want, got, what)
} else {
assert.Panics(t, func() {
cf.makeChunkFileName(test.off)
}, what)
}
}
}
// check that the object exists and has the contents
func checkObject(t *testing.T, f fs.Fs, remote string, want string) {
o, err := f.NewObject(context.TODO(), remote)
require.NoError(t, err)
dst := object.NewMemoryObject(remote, time.Now(), nil)
_, err = operations.Copy(context.TODO(), object.MemoryFs, dst, "", o)
require.NoError(t, err)
assert.Equal(t, want, string(dst.Content()))
}
// Constants uses in the tests
const (
writeBackDelay = 100 * time.Millisecond // A short writeback delay for testing
waitForWritersDelay = 30 * time.Second // time to wait for existing writers
)
// Clean up a test VFS
func cleanupVFS(t *testing.T, vfs *vfs.VFS) {
vfs.WaitForWriters(waitForWritersDelay)
err := vfs.CleanUp()
require.NoError(t, err)
vfs.Shutdown()
}
// Create a new VFS
func newTestVFSOpt(t *testing.T, opt *vfscommon.Options) (r *fstest.Run, VFS *vfs.VFS) {
r = fstest.NewRun(t)
VFS = vfs.New(r.Fremote, opt)
t.Cleanup(func() {
cleanupVFS(t, VFS)
})
return r, VFS
}
func TestNew(t *testing.T) {
_, VFS := newTestVFSOpt(t, nil)
// check default open
cf := New(VFS, "")
assert.Equal(t, 0, cf.opens)
err := cf.Open(true, defaultChunkBits)
assert.NoError(t, err)
assert.Equal(t, int64(0), cf.info.Size)
assert.Equal(t, uint(defaultChunkBits), cf.info.ChunkBits)
assert.Equal(t, 0x10000, cf.chunkSize)
assert.Equal(t, int64(0xFFFF), cf.chunkMask)
assert.Equal(t, ^int64(0xFFFF), cf.mask)
assert.Equal(t, 1, cf.opens)
// check the close
err = cf.Close()
assert.NoError(t, err)
assert.Equal(t, 0, cf.opens)
// check the double close
err = cf.Close()
assert.Error(t, err)
assert.Equal(t, 0, cf.opens)
// check that the info got written
checkObject(t, VFS.Fs(), cf.infoRemote, `{"Version":1,"Comment":"rclone chunked file","Size":0,"ChunkBits":16,"ChunkSize":65536}`)
// change the info
cf.info.Size = 100
cf.info.ChunkBits = 20
cf._updateChunkBits()
err = cf._writeInfo()
assert.NoError(t, err)
// read it back in
cf = New(VFS, "")
err = cf.Open(false, 0)
assert.NoError(t, err)
assert.Equal(t, int64(100), cf.info.Size)
assert.Equal(t, uint(20), cf.info.ChunkBits)
assert.Equal(t, 0x100000, cf.chunkSize)
assert.Equal(t, int64(0xFFFFF), cf.chunkMask)
assert.Equal(t, ^int64(0xFFFFF), cf.mask)
// check opens
// test limits for readInfo
for _, test := range []struct {
info string
error string
}{
{
`{"Version":1,"Comment":"rclone chunked file","Size":0,"ChunkBits":16,"ChunkSize":65536`,
"failed to decode chunk info file",
},
{
`{"Version":99,"Comment":"rclone chunked file","Size":0,"ChunkBits":16,"ChunkSize":65536}`,
"don't understand version 99 info files",
},
{
`{"Version":1,"Comment":"rclone chunked file","Size":0,"ChunkBits":1,"ChunkSize":65536}`,
"chunk bits 1 too small",
},
{
`{"Version":1,"Comment":"rclone chunked file","Size":0,"ChunkBits":99,"ChunkSize":65536}`,
"chunk bits 99 too large",
},
} {
require.NoError(t, VFS.WriteFile(cf.infoRemote, []byte(test.info), 0600))
err = cf._readInfo()
require.Error(t, err)
assert.Contains(t, err.Error(), test.error)
}
}
func newTestFile(t *testing.T) (*vfs.VFS, *File) {
opt := vfscommon.Opt
opt.CacheMode = vfscommon.CacheModeFull
opt.WriteBack = 0 // make writeback synchronous
_, VFS := newTestVFSOpt(t, &opt)
cf := New(VFS, "")
err := cf.Open(true, 4)
require.NoError(t, err)
t.Cleanup(func() {
require.NoError(t, cf.Close())
})
return VFS, cf
}
func TestReadWriteChunk(t *testing.T) {
VFS, cf := newTestFile(t)
const (
off = 0x123456789ABCDEF0
wantRemote = "01/23/45/67/89/AB/CD/0123456789ABCDEF.bin"
)
// pretend the file is big
require.NoError(t, cf.Truncate(2*off))
// check reading non existent chunk gives 0
var zero = make([]byte, 16)
var b = make([]byte, 16)
n, err := cf.ReadAt(b, off)
require.NoError(t, err)
assert.Equal(t, 16, n)
assert.Equal(t, zero, b)
// create a new chunk and write some data
n, err = cf.WriteAt([]byte("0123456789abcdef"), off)
require.NoError(t, err)
assert.Equal(t, 16, n)
// check the chunk on disk
checkObject(t, VFS.Fs(), wantRemote, "0123456789abcdef")
// read the chunk off disk and check it
n, err = cf.ReadAt(b, off)
require.NoError(t, err)
assert.Equal(t, 16, n)
assert.Equal(t, "0123456789abcdef", string(b))
}
func TestZeroBytes(t *testing.T) {
b := []byte{1, 2, 3, 4}
zeroBytes(b, 2)
assert.Equal(t, []byte{0, 0, 3, 4}, b)
b = []byte{1, 2, 3, 4}
zeroBytes(b, 17)
assert.Equal(t, []byte{0, 0, 0, 0}, b)
}
func TestReadAt(t *testing.T) {
_, cf := newTestFile(t)
// make a new chunk and write it to disk as chunk 1
zero := make([]byte, 16)
middle := []byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16}
n, err := cf.WriteAt(middle, 16)
require.NoError(t, err)
assert.Equal(t, 16, n)
// set the size to 0
cf.info.Size = 0
// check reading
b := make([]byte, 40)
n, err = cf.ReadAt(b, 0)
assert.Equal(t, 0, n)
assert.Equal(t, io.EOF, err)
// set the size to 38
cf.info.Size = 38
// read to end
n, err = cf.ReadAt(b, 0)
assert.Equal(t, 38, n)
assert.Equal(t, io.EOF, err)
expected := append([]byte(nil), zero...)
expected = append(expected, middle...)
expected = append(expected, zero[:6]...)
assert.Equal(t, expected, b[:n])
// read not to end
b = make([]byte, 16)
n, err = cf.ReadAt(b, 10)
assert.Equal(t, 16, n)
assert.NoError(t, err)
expected = append([]byte(nil), zero[10:]...)
expected = append(expected, middle[:10]...)
assert.Equal(t, expected, b[:n])
// read at end
n, err = cf.ReadAt(b, 38)
assert.Equal(t, 0, n)
assert.Equal(t, io.EOF, err)
// read past end
n, err = cf.ReadAt(b, 99)
assert.Equal(t, 0, n)
assert.Equal(t, io.EOF, err)
}
func TestWriteAt(t *testing.T) {
VFS, cf := newTestFile(t)
f := VFS.Fs()
// Make test buffer
b := []byte{}
for i := byte(0); i < 30; i++ {
b = append(b, '0'+i)
}
t.Run("SizeZero", func(t *testing.T) {
assert.Equal(t, int64(0), cf.Size())
})
const (
wantRemote1 = "00/00/00/00/00/00/00/0000000000000000.bin"
wantRemote2 = "00/00/00/00/00/00/00/0000000000000001.bin"
wantRemote3 = "00/00/00/00/00/00/00/0000000000000002.bin"
)
t.Run("Extended", func(t *testing.T) {
// write it and check file is extended
n, err := cf.WriteAt(b, 8)
assert.Equal(t, 30, n)
assert.NoError(t, err)
assert.Equal(t, int64(38), cf.info.Size)
// flush the parts to disk
require.NoError(t, cf.Sync())
// check the parts on disk
checkObject(t, f, wantRemote1, "\x00\x00\x00\x00\x00\x00\x00\x0001234567")
checkObject(t, f, wantRemote2, "89:;<=>?@ABCDEFG")
checkObject(t, f, wantRemote3, "HIJKLM\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
})
t.Run("Size", func(t *testing.T) {
assert.Equal(t, int64(38), cf.Size())
})
t.Run("Overwrite", func(t *testing.T) {
// overwrite a part
n, err := cf.WriteAt([]byte("abcdefgh"), 12)
assert.Equal(t, 8, n)
assert.NoError(t, err)
assert.Equal(t, int64(38), cf.info.Size)
// flush the parts to disk
require.NoError(t, cf.Sync())
// check the parts on disk
checkObject(t, f, wantRemote1, "\x00\x00\x00\x00\x00\x00\x00\x000123abcd")
checkObject(t, f, wantRemote2, "efgh<=>?@ABCDEFG")
checkObject(t, f, wantRemote3, "HIJKLM\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00")
})
t.Run("Remove", func(t *testing.T) {
require.Error(t, cf.Remove())
require.NoError(t, cf.Close())
// Check files are there
fis, err := VFS.ReadDir(cf.dir)
require.NoError(t, err)
assert.True(t, len(fis) > 0)
// Remove the file
require.NoError(t, cf.Remove())
// Check files have gone
fis, err = VFS.ReadDir(cf.dir)
what := fmt.Sprintf("err=%v, fis=%v", err, fis)
if err == nil {
assert.Equal(t, 0, len(fis), what)
} else {
require.True(t, errors.Is(err, stdfs.ErrNotExist), what)
}
// Reopen for cleanup
require.NoError(t, cf.Open(true, 0))
})
}