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pending.go
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pending.go
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package fs
import (
"fmt"
"os"
"syscall"
"bazil.org/bazil/db"
"bazil.org/bazil/fs/clock"
"bazil.org/bazil/fs/readonly"
wirepeer "bazil.org/bazil/peer/wire"
"bazil.org/bazil/util/env"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/tv42/zbase32"
"golang.org/x/net/context"
)
type pendingList struct {
dir *dir
}
var _ fs.Node = (*pendingList)(nil)
func (l *pendingList) Attr(ctx context.Context, a *fuse.Attr) error {
a.Mode = os.ModeDir | 0500
a.Uid = env.MyUID
a.Gid = env.MyGID
return nil
}
var _ fs.NodeStringLookuper = (*pendingList)(nil)
func (l *pendingList) Lookup(ctx context.Context, name string) (fs.Node, error) {
var child *pendingEntry
lookup := func(tx *db.Tx) error {
c := l.dir.fs.bucket(tx).Conflicts().ListAll(l.dir.inode)
item := c.First()
if item == nil {
return fuse.ENOENT
}
child = &pendingEntry{
list: l,
name: item.Name(),
}
return nil
}
if err := l.dir.fs.db.View(lookup); err != nil {
return nil, err
}
return child, nil
}
var _ fs.HandleReadDirAller = (*pendingList)(nil)
func (l *pendingList) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
var entries []fuse.Dirent
readDirAll := func(tx *db.Tx) error {
conflicts := l.dir.fs.bucket(tx).Conflicts()
c := conflicts.ListAll(l.dir.inode)
// the iterator sees every name+clock, not just every name;
// only pass unique names to results
prev := ""
for item := c.First(); item != nil; item = c.Next() {
name := item.Name()
if name == prev {
continue
}
prev = name
fde := fuse.Dirent{
Name: name,
Type: fuse.DT_Dir,
}
entries = append(entries, fde)
}
return nil
}
if err := l.dir.fs.db.View(readDirAll); err != nil {
return nil, err
}
return entries, nil
}
type pendingEntry struct {
list *pendingList
// name of the dentry these are pending clocks for
name string
}
var _ fs.Node = (*pendingEntry)(nil)
func (e *pendingEntry) Attr(ctx context.Context, a *fuse.Attr) error {
a.Mode = os.ModeDir | 0500
a.Uid = env.MyUID
a.Gid = env.MyGID
return nil
}
var _ fs.NodeStringLookuper = (*pendingEntry)(nil)
func (e *pendingEntry) Lookup(ctx context.Context, name string) (fs.Node, error) {
clockBuf, err := zbase32.DecodeString(name)
if err != nil {
return nil, fuse.ENOENT
}
var de wirepeer.Dirent
lookup := func(tx *db.Tx) error {
item := e.list.dir.fs.bucket(tx).Conflicts().Get(e.list.dir.inode, e.name, clockBuf)
if item == nil {
return fuse.ENOENT
}
if err := item.Dirent(&de); err != nil {
return err
}
return nil
}
if err := e.list.dir.fs.db.View(lookup); err != nil {
return nil, err
}
var child fs.Node
switch {
case de.File != nil:
manifest, err := de.File.Manifest.ToBlob("file")
if err != nil {
return nil, err
}
// TODO pass in mode and other metadata
f, err := readonly.NewFile(e.list.dir.fs.chunkStore, manifest)
if err != nil {
return nil, err
}
child = f
case de.Tombstone != nil:
return pendingTombstone{}, nil
default:
return nil, fmt.Errorf("unsupported pending direntry type: %#v", de)
}
return child, nil
}
var _ fs.HandleReadDirAller = (*pendingEntry)(nil)
func (e *pendingEntry) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
var entries []fuse.Dirent
readDirAll := func(tx *db.Tx) error {
conflicts := e.list.dir.fs.bucket(tx).Conflicts()
cursor := conflicts.List(e.list.dir.inode, e.name)
for item := cursor.First(); item != nil; item = cursor.Next() {
c, err := item.Clock()
if err != nil {
return err
}
clockBuf, err := c.MarshalBinary()
if err != nil {
return err
}
name := zbase32.EncodeToString(clockBuf)
fde := fuse.Dirent{
Name: name,
Type: fuse.DT_Dir,
}
entries = append(entries, fde)
}
return nil
}
if err := e.list.dir.fs.db.View(readDirAll); err != nil {
return nil, err
}
return entries, nil
}
var _ fs.NodeRemover = (*pendingEntry)(nil)
func (e *pendingEntry) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
if req.Dir {
return fuse.Errno(syscall.ENOTDIR)
}
clockBuf, err := zbase32.DecodeString(req.Name)
if err != nil {
return fuse.ENOENT
}
var loser clock.Clock
if err := loser.UnmarshalBinary(clockBuf); err != nil {
return fuse.ENOENT
}
// TODO we're assuming the main entry is not deleted (or that it
// still has a tombstone)?
update := func(tx *db.Tx) error {
bucket := e.list.dir.fs.bucket(tx)
if err := bucket.Conflicts().Delete(e.list.dir.inode, e.name, clockBuf); err != nil {
return err
}
clocks := bucket.Clock()
c, err := clocks.Get(e.list.dir.inode, e.name)
if err != nil {
return err
}
c.ResolveOurs(&loser)
if err := clocks.Put(e.list.dir.inode, e.name, c); err != nil {
return err
}
return nil
}
if err := e.list.dir.fs.db.Update(update); err != nil {
return err
}
return nil
}
type pendingTombstone struct{}
var _ fs.Node = pendingTombstone{}
func (pendingTombstone) Attr(ctx context.Context, a *fuse.Attr) error {
a.Mode = os.ModeSymlink | 0500
a.Uid = env.MyUID
a.Gid = env.MyGID
return nil
}
var _ fs.NodeReadlinker = pendingTombstone{}
func (pendingTombstone) Readlink(ctx context.Context, req *fuse.ReadlinkRequest) (string, error) {
// leading dot is there to avoid it being a valid zbase32 encoded
// string
return ".deleted", nil
}