676 lines
12 KiB
Go
676 lines
12 KiB
Go
package fs
|
|
|
|
import (
|
|
"bytes"
|
|
"database/sql"
|
|
"io"
|
|
"io/fs"
|
|
"os"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/pojntfx/stfs/internal/ioext"
|
|
"github.com/pojntfx/stfs/pkg/cache"
|
|
"github.com/pojntfx/stfs/pkg/config"
|
|
"github.com/pojntfx/stfs/pkg/inventory"
|
|
"github.com/pojntfx/stfs/pkg/logging"
|
|
"github.com/pojntfx/stfs/pkg/operations"
|
|
"github.com/spf13/afero"
|
|
)
|
|
|
|
type FileFlags struct {
|
|
Read bool
|
|
Write bool
|
|
|
|
Append bool
|
|
Truncate bool
|
|
}
|
|
|
|
type File struct {
|
|
afero.File
|
|
|
|
readOps *operations.Operations
|
|
writeOps *operations.Operations
|
|
|
|
metadata config.MetadataConfig
|
|
|
|
path string
|
|
link string
|
|
flags *FileFlags
|
|
|
|
compressionLevel string
|
|
getFileBuffer func() (cache.WriteCache, func() error, error)
|
|
|
|
name string
|
|
info os.FileInfo
|
|
|
|
ioLock *sync.Mutex
|
|
|
|
readOpReader *ioext.CounterReadCloser
|
|
readOpWriter io.WriteCloser
|
|
|
|
writeBuf cache.WriteCache
|
|
cleanWriteBuf func() error
|
|
|
|
onHeader func(hdr *config.Header)
|
|
log logging.StructuredLogger
|
|
}
|
|
|
|
func NewFile(
|
|
readOps *operations.Operations,
|
|
writeOps *operations.Operations,
|
|
|
|
metadata config.MetadataConfig,
|
|
|
|
path string,
|
|
link string,
|
|
flags *FileFlags,
|
|
|
|
compressionLevel string,
|
|
getFileBuffer func() (cache.WriteCache, func() error, error),
|
|
ioLock *sync.Mutex,
|
|
|
|
name string,
|
|
info os.FileInfo,
|
|
|
|
onHeader func(hdr *config.Header),
|
|
log logging.StructuredLogger,
|
|
) *File {
|
|
return &File{
|
|
readOps: readOps,
|
|
writeOps: writeOps,
|
|
|
|
metadata: metadata,
|
|
|
|
path: path,
|
|
link: link,
|
|
flags: flags,
|
|
|
|
compressionLevel: compressionLevel,
|
|
getFileBuffer: getFileBuffer,
|
|
ioLock: ioLock,
|
|
|
|
name: name,
|
|
info: info,
|
|
|
|
onHeader: onHeader,
|
|
log: log,
|
|
}
|
|
}
|
|
|
|
func (f *File) syncWithoutLocking() error {
|
|
f.log.Trace("File.syncWithoutLocking", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return config.ErrIsDirectory
|
|
}
|
|
|
|
if f.writeBuf != nil {
|
|
done := false
|
|
if _, err := f.writeOps.Update(
|
|
func() (config.FileConfig, error) {
|
|
// Exit after the first write
|
|
if done {
|
|
return config.FileConfig{}, io.EOF
|
|
}
|
|
done = true
|
|
|
|
size, err := f.writeBuf.Size()
|
|
if err != nil {
|
|
return config.FileConfig{}, err
|
|
}
|
|
|
|
// Some OSes like i.e. Windows don't support numeric GIDs and UIDs, so use 0 instead
|
|
gid := 0
|
|
uid := 0
|
|
modTime := f.info.ModTime()
|
|
accessTime := f.info.ModTime()
|
|
changeTime := f.info.ModTime()
|
|
sys, ok := f.info.Sys().(*Stat)
|
|
if ok {
|
|
gid = int(sys.Gid)
|
|
uid = int(sys.Uid)
|
|
accessTime = time.Unix(0, sys.Atim.Nano())
|
|
changeTime = time.Unix(0, sys.Ctim.Nano())
|
|
}
|
|
|
|
f.info = NewFileInfo(
|
|
f.info.Name(),
|
|
size,
|
|
f.info.Mode(),
|
|
modTime,
|
|
accessTime,
|
|
changeTime,
|
|
gid,
|
|
uid,
|
|
f.info.IsDir(),
|
|
f.log,
|
|
)
|
|
|
|
return config.FileConfig{
|
|
GetFile: func() (io.ReadSeekCloser, error) {
|
|
if _, err := f.writeBuf.Seek(0, io.SeekStart); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return f.writeBuf, nil
|
|
},
|
|
Info: f.info,
|
|
Path: f.path,
|
|
Link: f.link,
|
|
}, nil
|
|
},
|
|
f.compressionLevel,
|
|
true,
|
|
true,
|
|
); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (f *File) closeWithoutLocking() error {
|
|
f.log.Trace("File.closeWithoutLocking", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
if f.readOpReader != nil {
|
|
if err := f.readOpReader.Close(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if f.readOpWriter != nil {
|
|
if err := f.readOpWriter.Close(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if f.writeBuf != nil {
|
|
// No need to close write buffer, the `update` operation closes it itself
|
|
if err := f.syncWithoutLocking(); err != nil {
|
|
return err
|
|
}
|
|
|
|
if err := f.cleanWriteBuf(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
f.readOpReader = nil
|
|
f.readOpWriter = nil
|
|
f.writeBuf = nil
|
|
|
|
return nil
|
|
}
|
|
|
|
func (f *File) enterWriteMode() error {
|
|
f.log.Trace("File.enterWriteMode", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
if f.readOpReader != nil || f.readOpWriter != nil {
|
|
if err := f.closeWithoutLocking(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if f.writeBuf == nil {
|
|
exists := false
|
|
_, err := inventory.Stat(
|
|
f.metadata,
|
|
|
|
f.path,
|
|
false,
|
|
|
|
f.onHeader,
|
|
)
|
|
if err == nil {
|
|
exists = true
|
|
} else {
|
|
if err != sql.ErrNoRows {
|
|
return err
|
|
}
|
|
}
|
|
|
|
// Create new buffer
|
|
writeBuf, cleanWriteBuf, err := f.getFileBuffer()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
f.writeBuf = writeBuf
|
|
f.cleanWriteBuf = cleanWriteBuf
|
|
|
|
// Read existing file into buffer
|
|
if exists {
|
|
if err := f.readOps.Restore(
|
|
func(path string, mode fs.FileMode) (io.WriteCloser, error) {
|
|
// Don't close the file here, we want to re-use it!
|
|
return ioext.AddCloseNopToWriter(f.writeBuf), nil
|
|
},
|
|
func(path string, mode fs.FileMode) error {
|
|
// Not necessary; can't read on a directory
|
|
return nil
|
|
},
|
|
|
|
f.path,
|
|
"",
|
|
true,
|
|
); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if f.flags.Truncate {
|
|
if err := f.writeBuf.Truncate(0); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if !f.flags.Append {
|
|
if _, err := f.writeBuf.Seek(0, io.SeekStart); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (f *File) seekWithoutLocking(offset int64, whence int) (int64, error) {
|
|
f.log.Trace("File.seekWithoutLocking", map[string]interface{}{
|
|
"name": f.name,
|
|
"offset": offset,
|
|
"whence": whence,
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if f.writeBuf != nil {
|
|
return f.writeBuf.Seek(offset, whence)
|
|
}
|
|
|
|
dst := int64(0)
|
|
switch whence {
|
|
case io.SeekStart:
|
|
dst = offset
|
|
case io.SeekCurrent:
|
|
curr := 0
|
|
if f.readOpReader != nil {
|
|
curr = f.readOpReader.BytesRead
|
|
}
|
|
dst = int64(curr) + offset
|
|
case io.SeekEnd:
|
|
dst = f.info.Size() - offset
|
|
default:
|
|
return -1, config.ErrNotImplemented
|
|
}
|
|
|
|
if f.readOpReader == nil || f.readOpWriter == nil || dst < int64(f.readOpReader.BytesRead) { // We have to re-open as we can't seek backwards
|
|
_ = f.closeWithoutLocking() // Ignore errors here as it might not be opened
|
|
|
|
r, writer := io.Pipe()
|
|
reader := &ioext.CounterReadCloser{
|
|
Reader: r,
|
|
BytesRead: 0,
|
|
}
|
|
|
|
go func() {
|
|
if err := f.readOps.Restore(
|
|
func(path string, mode fs.FileMode) (io.WriteCloser, error) {
|
|
return writer, nil
|
|
},
|
|
func(path string, mode fs.FileMode) error {
|
|
// Not necessary; can't read on a directory
|
|
return nil
|
|
},
|
|
|
|
f.path,
|
|
"",
|
|
true,
|
|
); err != nil {
|
|
if err == io.ErrClosedPipe {
|
|
return
|
|
}
|
|
|
|
// TODO: Handle error
|
|
panic(err)
|
|
}
|
|
}()
|
|
|
|
f.readOpReader = reader
|
|
f.readOpWriter = writer
|
|
}
|
|
|
|
written, err := io.CopyN(io.Discard, f.readOpReader, dst-int64(f.readOpReader.BytesRead))
|
|
if err == io.EOF {
|
|
return written, io.EOF
|
|
}
|
|
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return written, nil
|
|
}
|
|
|
|
// Inventory
|
|
func (f *File) Name() string {
|
|
f.log.Trace("File.Name", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
return f.path
|
|
}
|
|
|
|
func (f *File) Stat() (os.FileInfo, error) {
|
|
f.log.Trace("File.Stat", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
return f.info, nil
|
|
}
|
|
|
|
func (f *File) Readdir(count int) ([]os.FileInfo, error) {
|
|
f.log.Trace("File.Readdir", map[string]interface{}{
|
|
"name": f.name,
|
|
"count": count,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if !f.info.IsDir() {
|
|
return []os.FileInfo{}, config.ErrIsFile
|
|
}
|
|
hdrs, err := inventory.List(
|
|
f.metadata,
|
|
|
|
f.path,
|
|
count,
|
|
|
|
f.onHeader,
|
|
)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
fileInfos := []os.FileInfo{}
|
|
for _, hdr := range hdrs {
|
|
fileInfos = append(fileInfos, NewFileInfoFromTarHeader(hdr, f.log))
|
|
}
|
|
|
|
return fileInfos, nil
|
|
}
|
|
|
|
func (f *File) Readdirnames(n int) ([]string, error) {
|
|
f.log.Trace("File.Readdirnames", map[string]interface{}{
|
|
"name": f.name,
|
|
"n": n,
|
|
})
|
|
|
|
if !f.info.IsDir() {
|
|
return []string{}, config.ErrIsFile
|
|
}
|
|
|
|
dirs, err := f.Readdir(n)
|
|
if err != nil {
|
|
return []string{}, err
|
|
}
|
|
|
|
names := []string{}
|
|
for _, dir := range dirs {
|
|
names = append(names, dir.Name())
|
|
}
|
|
|
|
return names, err
|
|
}
|
|
|
|
// Read operations
|
|
func (f *File) Read(p []byte) (n int, err error) {
|
|
f.log.Trace("File.Read", map[string]interface{}{
|
|
"name": f.name,
|
|
"p": len(p),
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Read {
|
|
return -1, os.ErrPermission
|
|
}
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if f.writeBuf != nil {
|
|
return f.writeBuf.Read(p)
|
|
}
|
|
|
|
if f.readOpReader == nil || f.readOpWriter == nil {
|
|
r, writer := io.Pipe()
|
|
reader := &ioext.CounterReadCloser{
|
|
Reader: r,
|
|
BytesRead: 0,
|
|
}
|
|
|
|
go func() {
|
|
if err := f.readOps.Restore(
|
|
func(path string, mode fs.FileMode) (io.WriteCloser, error) {
|
|
return writer, nil
|
|
},
|
|
func(path string, mode fs.FileMode) error {
|
|
// Not necessary; can't read on a directory
|
|
return nil
|
|
},
|
|
|
|
f.path,
|
|
"",
|
|
true,
|
|
); err != nil {
|
|
if err == io.ErrClosedPipe {
|
|
return
|
|
}
|
|
|
|
// TODO: Handle error
|
|
panic(err)
|
|
}
|
|
}()
|
|
|
|
f.readOpReader = reader
|
|
f.readOpWriter = writer
|
|
}
|
|
|
|
w := &bytes.Buffer{}
|
|
_, err = io.CopyN(w, f.readOpReader, int64(len(p)))
|
|
if err == io.EOF {
|
|
return copy(p, w.Bytes()), io.EOF
|
|
}
|
|
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return copy(p, w.Bytes()), nil
|
|
}
|
|
|
|
func (f *File) ReadAt(p []byte, off int64) (n int, err error) {
|
|
f.log.Trace("File.ReadAt", map[string]interface{}{
|
|
"name": f.name,
|
|
"p": len(p),
|
|
"off": off,
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Read {
|
|
return -1, os.ErrPermission
|
|
}
|
|
|
|
if _, err := f.Seek(off, io.SeekStart); err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return f.Read(p)
|
|
}
|
|
|
|
// Read/write operations
|
|
func (f *File) Seek(offset int64, whence int) (int64, error) {
|
|
f.log.Trace("File.Seek", map[string]interface{}{
|
|
"name": f.name,
|
|
"offset": offset,
|
|
"whence": whence,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
return f.seekWithoutLocking(offset, whence)
|
|
}
|
|
|
|
// Write operations
|
|
func (f *File) Write(p []byte) (n int, err error) {
|
|
f.log.Trace("File.Write", map[string]interface{}{
|
|
"name": f.name,
|
|
"p": len(p),
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Write {
|
|
return -1, os.ErrPermission
|
|
}
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if err := f.enterWriteMode(); err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
n, err = f.writeBuf.Write(p)
|
|
if err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return n, nil
|
|
}
|
|
|
|
func (f *File) WriteAt(p []byte, off int64) (n int, err error) {
|
|
f.log.Trace("File.WriteAt", map[string]interface{}{
|
|
"name": f.name,
|
|
"p": len(p),
|
|
"off": off,
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Write {
|
|
return -1, os.ErrPermission
|
|
}
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if err := f.enterWriteMode(); err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
if _, err := f.seekWithoutLocking(off, io.SeekStart); err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return f.writeBuf.Write(p)
|
|
}
|
|
|
|
func (f *File) WriteString(s string) (ret int, err error) {
|
|
f.log.Trace("File.WriteString", map[string]interface{}{
|
|
"name": f.name,
|
|
"s": len(s),
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return -1, config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Write {
|
|
return -1, os.ErrPermission
|
|
}
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if err := f.enterWriteMode(); err != nil {
|
|
return -1, err
|
|
}
|
|
|
|
return f.writeBuf.Write([]byte(s))
|
|
}
|
|
|
|
func (f *File) Truncate(size int64) error {
|
|
f.log.Trace("File.Truncate", map[string]interface{}{
|
|
"name": f.name,
|
|
"size": size,
|
|
})
|
|
|
|
if f.info.IsDir() {
|
|
return config.ErrIsDirectory
|
|
}
|
|
|
|
if !f.flags.Write {
|
|
return os.ErrPermission
|
|
}
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
if err := f.enterWriteMode(); err != nil {
|
|
return err
|
|
}
|
|
|
|
return f.writeBuf.Truncate(size)
|
|
}
|
|
|
|
// Cleanup operations
|
|
func (f *File) Sync() error {
|
|
f.log.Trace("File.Sync", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
return f.syncWithoutLocking()
|
|
}
|
|
|
|
func (f *File) Close() error {
|
|
f.log.Debug("File.Close", map[string]interface{}{
|
|
"name": f.name,
|
|
})
|
|
|
|
f.ioLock.Lock()
|
|
defer f.ioLock.Unlock()
|
|
|
|
return f.closeWithoutLocking()
|
|
}
|