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native.go
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native.go
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package driver
import (
"os"
pathlib "path"
"path/filepath"
"strings"
"time"
"github.com/DanielSvub/gonatus/errors"
"github.com/DanielSvub/gonatus/fs"
"github.com/DanielSvub/stream"
"github.com/DanielSvub/gonatus"
)
type NativeStorageConf struct {
Prefix string
}
type nativeStorageDriver struct {
gonatus.Gobject
id gonatus.GId
prefix string
opened map[*os.File]fs.FileConf
openedR map[string]*os.File
}
func NewNativeStorage(conf NativeStorageConf) fs.Storage {
driver := new(nativeStorageDriver)
if conf.Prefix == "" {
driver.prefix = "/"
} else {
driver.prefix, _ = filepath.Abs(conf.Prefix)
}
driver.opened = make(map[*os.File]fs.FileConf)
driver.openedR = make(map[string]*os.File)
return fs.NewStorage(driver)
}
func (ego *nativeStorageDriver) nativePath(path fs.Path) string {
return pathlib.Join(ego.prefix, strings.Join(path, "/"))
}
func (ego *nativeStorageDriver) storagePath(path string) fs.Path {
pfxLen := len(strings.Split(ego.prefix, "/"))
return strings.Split(path, "/")[pfxLen:]
}
func (ego *nativeStorageDriver) Open(path fs.Path, mode fs.FileMode, givenFlags fs.FileFlags, origTime time.Time) (fs.FileDescriptor, error) {
// Creating flags
var flags int
switch mode {
case fs.ModeRead:
flags = os.O_RDONLY
case fs.ModeWrite, fs.ModeAppend, fs.ModeRW:
return nil, errors.NewNotImplError(ego)
default:
return nil, errors.NewMisappError(ego, "Invalid opening mode.")
}
// Opening the existing file
npath := ego.nativePath(path)
fd, err := os.OpenFile(npath, flags, 0664)
if err != nil {
return nil, err
}
ego.opened[fd] = fs.FileConf{
Path: path,
StorageId: ego.id,
}
ego.openedR[npath] = fd
// TODO: make sharable localFileDescriptor for fs based on local filesystem
return &localFileDescriptor{
fd: fd,
}, nil
}
func (ego *nativeStorageDriver) CloseDescriptor(_ fs.FileDescriptor, _ fs.Path) error {
return nil
}
func (ego *nativeStorageDriver) CloseFile(path fs.Path) error {
fd := ego.openedR[ego.nativePath(path)]
return fd.Close()
}
func (ego *nativeStorageDriver) MkDir(path fs.Path, origTime time.Time) error {
return errors.NewNotImplError(ego)
}
func (ego *nativeStorageDriver) Copy(srcPath fs.Path, dstPath fs.Path) error {
return errors.NewNotImplError(ego)
}
func (ego *nativeStorageDriver) Move(srcPath fs.Path, dstPath fs.Path) error {
return errors.NewNotImplError(ego)
}
func (ego *nativeStorageDriver) Delete(path fs.Path) error {
return errors.NewNotImplError(ego)
}
type nativeRecord struct {
path string
isDir bool
size uint64
}
func nativeStat(path string) (bool, nativeRecord, error) {
info, err := os.Stat(path)
if err != nil {
return false, nativeRecord{}, err
}
me := nativeRecord{path: path}
me.isDir = info.IsDir()
if !me.isDir {
me.size = uint64(info.Size())
}
return true, me, nil
}
func filterImpl(pfx string, depth fs.Depth) (accum []nativeRecord, err error) {
info, err := os.Stat(pfx)
if os.IsNotExist(err) {
return
}
me := nativeRecord{path: pfx, isDir: info.IsDir()}
accum = append(make([]nativeRecord, 0), me)
if !me.isDir || depth <= 0 {
return
}
items, _ := os.ReadDir(pfx)
for _, item := range items {
children, err := filterImpl(pathlib.Join(pfx, item.Name()), depth-1)
if err != nil {
return nil, err
}
accum = append(accum, children...)
}
return
}
func (ego *nativeStorageDriver) exportToStream(files []nativeRecord) (stream.Producer[fs.File], error) {
export := func(s stream.ChanneledInput[fs.File]) {
defer s.Close()
for _, f := range files {
flags := fs.FileContent
if f.isDir {
flags = fs.FileTopology
}
s.Write(fs.NewFile(fs.FileConf{
StorageId: ego.id,
Path: ego.storagePath(f.path),
Flags: flags,
}))
}
}
s := stream.NewChanneledInput[fs.File](1)
go export(s)
return s, nil
}
func (ego *nativeStorageDriver) Tree(path fs.Path, depth fs.Depth) (stream.Producer[fs.File], error) {
lst, err := filterImpl(ego.nativePath(path), depth)
if err != nil {
return nil, err
}
return ego.exportToStream(lst)
}
func (ego *nativeStorageDriver) Flags(path fs.Path) (fs.FileFlags, error) {
valid, record, err := nativeStat(ego.nativePath(path))
if !valid {
return fs.FileUndetermined, err
}
if record.isDir {
return fs.FileTopology, nil
}
return fs.FileContent, nil
}
func (ego *nativeStorageDriver) Location(path fs.Path) (string, error) {
return ego.nativePath(path), nil
}
func (ego *nativeStorageDriver) Size(path fs.Path) (uint64, error) {
valid, record, err := nativeStat(ego.nativePath(path))
if !valid {
return 0, errors.NewNotFoundError(ego, errors.LevelError, "No such file or directory")
}
if err != nil {
return 0, err
}
return record.size, nil
}
func (ego *nativeStorageDriver) Commit() error {
return errors.NewNotImplError(ego)
}
func (ego *nativeStorageDriver) Clear() (err error) {
return errors.NewNotImplError(ego)
}
func (ego *nativeStorageDriver) Features() fs.StorageFeatures {
return fs.FeatureRead | fs.FeatureLocation
}
func (ego *nativeStorageDriver) Id() gonatus.GId {
return ego.id
}
func (ego *nativeStorageDriver) SetId(id gonatus.GId) {
ego.id = id
}
func (ego *nativeStorageDriver) Serialize() gonatus.Conf {
return NativeStorageConf{Prefix: ego.prefix}
}