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// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// +build linux darwin freebsd
package fuse
import (
"os"
"path/filepath"
"sync"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/dexon-foundation/dexon/swarm/log"
"golang.org/x/net/context"
)
var (
_ fs.Node = (*SwarmDir)(nil)
_ fs.NodeRequestLookuper = (*SwarmDir)(nil)
_ fs.HandleReadDirAller = (*SwarmDir)(nil)
_ fs.NodeCreater = (*SwarmDir)(nil)
_ fs.NodeRemover = (*SwarmDir)(nil)
_ fs.NodeMkdirer = (*SwarmDir)(nil)
)
type SwarmDir struct {
inode uint64
name string
path string
directories []*SwarmDir
files []*SwarmFile
mountInfo *MountInfo
lock *sync.RWMutex
}
func NewSwarmDir(fullpath string, minfo *MountInfo) *SwarmDir {
log.Debug("swarmfs", "NewSwarmDir", fullpath)
newdir := &SwarmDir{
inode: NewInode(),
name: filepath.Base(fullpath),
path: fullpath,
directories: []*SwarmDir{},
files: []*SwarmFile{},
mountInfo: minfo,
lock: &sync.RWMutex{},
}
return newdir
}
func (sd *SwarmDir) Attr(ctx context.Context, a *fuse.Attr) error {
sd.lock.RLock()
defer sd.lock.RUnlock()
a.Inode = sd.inode
a.Mode = os.ModeDir | 0700
a.Uid = uint32(os.Getuid())
a.Gid = uint32(os.Getegid())
return nil
}
func (sd *SwarmDir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fs.Node, error) {
log.Debug("swarmfs", "Lookup", req.Name)
for _, n := range sd.files {
if n.name == req.Name {
return n, nil
}
}
for _, n := range sd.directories {
if n.name == req.Name {
return n, nil
}
}
return nil, fuse.ENOENT
}
func (sd *SwarmDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
log.Debug("swarmfs ReadDirAll")
var children []fuse.Dirent
for _, file := range sd.files {
children = append(children, fuse.Dirent{Inode: file.inode, Type: fuse.DT_File, Name: file.name})
}
for _, dir := range sd.directories {
children = append(children, fuse.Dirent{Inode: dir.inode, Type: fuse.DT_Dir, Name: dir.name})
}
return children, nil
}
func (sd *SwarmDir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {
log.Debug("swarmfs Create", "path", sd.path, "req.Name", req.Name)
newFile := NewSwarmFile(sd.path, req.Name, sd.mountInfo)
newFile.fileSize = 0 // 0 means, file is not in swarm yet and it is just created
sd.lock.Lock()
defer sd.lock.Unlock()
sd.files = append(sd.files, newFile)
return newFile, newFile, nil
}
func (sd *SwarmDir) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
log.Debug("swarmfs Remove", "path", sd.path, "req.Name", req.Name)
if req.Dir && sd.directories != nil {
newDirs := []*SwarmDir{}
for _, dir := range sd.directories {
if dir.name == req.Name {
removeDirectoryFromSwarm(dir)
} else {
newDirs = append(newDirs, dir)
}
}
if len(sd.directories) > len(newDirs) {
sd.lock.Lock()
defer sd.lock.Unlock()
sd.directories = newDirs
}
return nil
} else if !req.Dir && sd.files != nil {
newFiles := []*SwarmFile{}
for _, f := range sd.files {
if f.name == req.Name {
removeFileFromSwarm(f)
} else {
newFiles = append(newFiles, f)
}
}
if len(sd.files) > len(newFiles) {
sd.lock.Lock()
defer sd.lock.Unlock()
sd.files = newFiles
}
return nil
}
return fuse.ENOENT
}
func (sd *SwarmDir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, error) {
log.Debug("swarmfs Mkdir", "path", sd.path, "req.Name", req.Name)
newDir := NewSwarmDir(filepath.Join(sd.path, req.Name), sd.mountInfo)
sd.lock.Lock()
defer sd.lock.Unlock()
sd.directories = append(sd.directories, newDir)
return newDir, nil
}
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