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unixfile.go
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unixfile.go
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package coreapi
import (
"context"
"errors"
"io"
"os"
gopath "path"
"time"
"github.com/ipfs/go-ipfs/core/coreapi/interface"
ipld "gx/ipfs/QmR7TcHkR9nxkUorfi8XMTAMLUK7GiP64TWWBzY3aacc1o/go-ipld-format"
dag "gx/ipfs/QmSei8kFMfqdJq7Q68d2LMnHbTWKKg2daA29ezUYFAUNgc/go-merkledag"
files "gx/ipfs/QmZMWMvWMVKCbHetJ4RgndbuEF1io2UpUxwQwtNjtYPzSC/go-ipfs-files"
ft "gx/ipfs/QmfB3oNXGGq9S4B2a9YeCajoATms3Zw2VvDm8fK7VeLSV8/go-unixfs"
uio "gx/ipfs/QmfB3oNXGGq9S4B2a9YeCajoATms3Zw2VvDm8fK7VeLSV8/go-unixfs/io"
)
// Number to file to prefetch in directories
// TODO: should we allow setting this via context hint?
const prefetchFiles = 4
// TODO: this probably belongs in go-unixfs (and could probably replace a chunk of it's interface in the long run)
type sizeInfo struct {
size int64
name string
modTime time.Time
}
func (s *sizeInfo) Name() string {
return s.name
}
func (s *sizeInfo) Size() int64 {
return s.size
}
func (s *sizeInfo) Mode() os.FileMode {
return 0444 // all read
}
func (s *sizeInfo) ModTime() time.Time {
return s.modTime
}
func (s *sizeInfo) IsDir() bool {
return false
}
func (s *sizeInfo) Sys() interface{} {
return nil
}
type ufsDirectory struct {
ctx context.Context
dserv ipld.DAGService
files chan *ipld.Link
name string
path string
}
func (d *ufsDirectory) Close() error {
return files.ErrNotReader
}
func (d *ufsDirectory) Read(_ []byte) (int, error) {
return 0, files.ErrNotReader
}
func (d *ufsDirectory) FileName() string {
return d.name
}
func (d *ufsDirectory) FullPath() string {
return d.path
}
func (d *ufsDirectory) IsDirectory() bool {
return true
}
func (d *ufsDirectory) NextFile() (files.File, error) {
l, ok := <-d.files
if !ok {
return nil, io.EOF
}
nd, err := l.GetNode(d.ctx, d.dserv)
if err != nil {
return nil, err
}
return newUnixfsFile(d.ctx, d.dserv, nd, l.Name, d)
}
func (d *ufsDirectory) Size() (int64, error) {
return 0, files.ErrNotReader
}
func (d *ufsDirectory) Seek(offset int64, whence int) (int64, error) {
return 0, files.ErrNotReader
}
type ufsFile struct {
uio.DagReader
name string
path string
}
func (f *ufsFile) IsDirectory() bool {
return false
}
func (f *ufsFile) NextFile() (files.File, error) {
return nil, files.ErrNotDirectory
}
func (f *ufsFile) FileName() string {
return f.name
}
func (f *ufsFile) FullPath() string {
return f.path
}
func (f *ufsFile) Size() (int64, error) {
return int64(f.DagReader.Size()), nil
}
func newUnixfsDir(ctx context.Context, dserv ipld.DAGService, nd ipld.Node, name string, path string) (iface.UnixfsFile, error) {
dir, err := uio.NewDirectoryFromNode(dserv, nd)
if err != nil {
return nil, err
}
fileCh := make(chan *ipld.Link, prefetchFiles)
go func() {
dir.ForEachLink(ctx, func(link *ipld.Link) error {
select {
case fileCh <- link:
case <-ctx.Done():
return ctx.Err()
}
return nil
})
close(fileCh)
}()
return &ufsDirectory{
ctx: ctx,
dserv: dserv,
files: fileCh,
name: name,
path: path,
}, nil
}
func newUnixfsFile(ctx context.Context, dserv ipld.DAGService, nd ipld.Node, name string, parent files.File) (iface.UnixfsFile, error) {
path := name
if parent != nil {
path = gopath.Join(parent.FullPath(), name)
}
switch dn := nd.(type) {
case *dag.ProtoNode:
fsn, err := ft.FSNodeFromBytes(dn.Data())
if err != nil {
return nil, err
}
if fsn.IsDir() {
return newUnixfsDir(ctx, dserv, nd, name, path)
}
case *dag.RawNode:
default:
return nil, errors.New("unknown node type")
}
dr, err := uio.NewDagReader(ctx, nd, dserv)
if err != nil {
return nil, err
}
return &ufsFile{
DagReader: dr,
name: name,
path: path,
}, nil
}
var _ os.FileInfo = &sizeInfo{}