/
dir.go
270 lines (225 loc) · 5.43 KB
/
dir.go
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package ipnsfs
import (
"errors"
"fmt"
"os"
"sync"
"time"
context "github.com/ipfs/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
dag "github.com/ipfs/go-ipfs/merkledag"
ft "github.com/ipfs/go-ipfs/unixfs"
ufspb "github.com/ipfs/go-ipfs/unixfs/pb"
)
var ErrNotYetImplemented = errors.New("not yet implemented")
var ErrInvalidChild = errors.New("invalid child node")
type Directory struct {
fs *Filesystem
parent childCloser
childDirs map[string]*Directory
files map[string]*File
lock sync.Mutex
node *dag.Node
name string
}
func NewDirectory(name string, node *dag.Node, parent childCloser, fs *Filesystem) *Directory {
return &Directory{
fs: fs,
name: name,
node: node,
parent: parent,
childDirs: make(map[string]*Directory),
files: make(map[string]*File),
}
}
// closeChild updates the child by the given name to the dag node 'nd'
// and changes its own dag node, then propogates the changes upward
func (d *Directory) closeChild(name string, nd *dag.Node) error {
_, err := d.fs.dserv.Add(nd)
if err != nil {
return err
}
d.lock.Lock()
defer d.lock.Unlock()
err = d.node.RemoveNodeLink(name)
if err != nil && err != dag.ErrNotFound {
return err
}
err = d.node.AddNodeLinkClean(name, nd)
if err != nil {
return err
}
return d.parent.closeChild(d.name, d.node)
}
func (d *Directory) Type() NodeType {
return TDir
}
// childFile returns a file under this directory by the given name if it exists
func (d *Directory) childFile(name string) (*File, error) {
fi, ok := d.files[name]
if ok {
return fi, nil
}
nd, err := d.childFromDag(name)
if err != nil {
return nil, err
}
i, err := ft.FromBytes(nd.Data)
if err != nil {
return nil, err
}
switch i.GetType() {
case ufspb.Data_Directory:
return nil, ErrIsDirectory
case ufspb.Data_File:
nfi, err := NewFile(name, nd, d, d.fs)
if err != nil {
return nil, err
}
d.files[name] = nfi
return nfi, nil
case ufspb.Data_Metadata:
return nil, ErrNotYetImplemented
default:
return nil, ErrInvalidChild
}
}
// childDir returns a directory under this directory by the given name if it
// exists.
func (d *Directory) childDir(name string) (*Directory, error) {
dir, ok := d.childDirs[name]
if ok {
return dir, nil
}
nd, err := d.childFromDag(name)
if err != nil {
return nil, err
}
i, err := ft.FromBytes(nd.Data)
if err != nil {
return nil, err
}
switch i.GetType() {
case ufspb.Data_Directory:
ndir := NewDirectory(name, nd, d, d.fs)
d.childDirs[name] = ndir
return ndir, nil
case ufspb.Data_File:
return nil, fmt.Errorf("%s is not a directory", name)
case ufspb.Data_Metadata:
return nil, ErrNotYetImplemented
default:
return nil, ErrInvalidChild
}
}
// childFromDag searches through this directories dag node for a child link
// with the given name
func (d *Directory) childFromDag(name string) (*dag.Node, error) {
for _, lnk := range d.node.Links {
if lnk.Name == name {
ctx, cancel := context.WithTimeout(context.TODO(), time.Minute)
defer cancel()
return lnk.GetNode(ctx, d.fs.dserv)
}
}
return nil, os.ErrNotExist
}
// Child returns the child of this directory by the given name
func (d *Directory) Child(name string) (FSNode, error) {
d.lock.Lock()
defer d.lock.Unlock()
return d.childUnsync(name)
}
// childUnsync returns the child under this directory by the given name
// without locking, useful for operations which already hold a lock
func (d *Directory) childUnsync(name string) (FSNode, error) {
dir, err := d.childDir(name)
if err == nil {
return dir, nil
}
fi, err := d.childFile(name)
if err == nil {
return fi, nil
}
return nil, os.ErrNotExist
}
func (d *Directory) List() []string {
d.lock.Lock()
defer d.lock.Unlock()
var out []string
for _, lnk := range d.node.Links {
out = append(out, lnk.Name)
}
return out
}
func (d *Directory) Mkdir(name string) (*Directory, error) {
d.lock.Lock()
defer d.lock.Unlock()
_, err := d.childDir(name)
if err == nil {
return nil, os.ErrExist
}
_, err = d.childFile(name)
if err == nil {
return nil, os.ErrExist
}
ndir := &dag.Node{Data: ft.FolderPBData()}
err = d.node.AddNodeLinkClean(name, ndir)
if err != nil {
return nil, err
}
err = d.parent.closeChild(d.name, d.node)
if err != nil {
return nil, err
}
return d.childDir(name)
}
func (d *Directory) Unlink(name string) error {
d.lock.Lock()
defer d.lock.Unlock()
delete(d.childDirs, name)
delete(d.files, name)
err := d.node.RemoveNodeLink(name)
if err != nil {
return err
}
return d.parent.closeChild(d.name, d.node)
}
// AddChild adds the node 'nd' under this directory giving it the name 'name'
func (d *Directory) AddChild(name string, nd *dag.Node) error {
d.Lock()
defer d.Unlock()
pbn, err := ft.FromBytes(nd.Data)
if err != nil {
return err
}
_, err = d.childUnsync(name)
if err == nil {
return errors.New("directory already has entry by that name")
}
err = d.node.AddNodeLinkClean(name, nd)
if err != nil {
return err
}
switch pbn.GetType() {
case ft.TDirectory:
d.childDirs[name] = NewDirectory(name, nd, d, d.fs)
case ft.TFile, ft.TMetadata, ft.TRaw:
nfi, err := NewFile(name, nd, d, d.fs)
if err != nil {
return err
}
d.files[name] = nfi
default:
return ErrInvalidChild
}
return d.parent.closeChild(d.name, d.node)
}
func (d *Directory) GetNode() (*dag.Node, error) {
return d.node, nil
}
func (d *Directory) Lock() {
d.lock.Lock()
}
func (d *Directory) Unlock() {
d.lock.Unlock()
}