github.com/alanchchen/go-ethereum@v1.6.6-0.20170601190819-6171d01b1195/swarm/fuse/fuse_dir.go (about)

     1  // Copyright 2017 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  // +build linux darwin freebsd
    18  
    19  package fuse
    20  
    21  import (
    22  	"bazil.org/fuse"
    23  	"bazil.org/fuse/fs"
    24  	"golang.org/x/net/context"
    25  	"os"
    26  	"path/filepath"
    27  	"sync"
    28  )
    29  
    30  var (
    31  	_ fs.Node                = (*SwarmDir)(nil)
    32  	_ fs.NodeRequestLookuper = (*SwarmDir)(nil)
    33  	_ fs.HandleReadDirAller  = (*SwarmDir)(nil)
    34  	_ fs.NodeCreater         = (*SwarmDir)(nil)
    35  	_ fs.NodeRemover         = (*SwarmDir)(nil)
    36  	_ fs.NodeMkdirer         = (*SwarmDir)(nil)
    37  )
    38  
    39  type SwarmDir struct {
    40  	inode       uint64
    41  	name        string
    42  	path        string
    43  	directories []*SwarmDir
    44  	files       []*SwarmFile
    45  
    46  	mountInfo *MountInfo
    47  	lock      *sync.RWMutex
    48  }
    49  
    50  func NewSwarmDir(fullpath string, minfo *MountInfo) *SwarmDir {
    51  	newdir := &SwarmDir{
    52  		inode:       NewInode(),
    53  		name:        filepath.Base(fullpath),
    54  		path:        fullpath,
    55  		directories: []*SwarmDir{},
    56  		files:       []*SwarmFile{},
    57  		mountInfo:   minfo,
    58  		lock:        &sync.RWMutex{},
    59  	}
    60  	return newdir
    61  }
    62  
    63  func (sd *SwarmDir) Attr(ctx context.Context, a *fuse.Attr) error {
    64  	a.Inode = sd.inode
    65  	a.Mode = os.ModeDir | 0700
    66  	a.Uid = uint32(os.Getuid())
    67  	a.Gid = uint32(os.Getegid())
    68  	return nil
    69  }
    70  
    71  func (sd *SwarmDir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.LookupResponse) (fs.Node, error) {
    72  
    73  	for _, n := range sd.files {
    74  		if n.name == req.Name {
    75  			return n, nil
    76  		}
    77  	}
    78  	for _, n := range sd.directories {
    79  		if n.name == req.Name {
    80  			return n, nil
    81  		}
    82  	}
    83  	return nil, fuse.ENOENT
    84  }
    85  
    86  func (sd *SwarmDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
    87  	var children []fuse.Dirent
    88  	for _, file := range sd.files {
    89  		children = append(children, fuse.Dirent{Inode: file.inode, Type: fuse.DT_File, Name: file.name})
    90  	}
    91  	for _, dir := range sd.directories {
    92  		children = append(children, fuse.Dirent{Inode: dir.inode, Type: fuse.DT_Dir, Name: dir.name})
    93  	}
    94  	return children, nil
    95  }
    96  
    97  func (sd *SwarmDir) Create(ctx context.Context, req *fuse.CreateRequest, resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {
    98  
    99  	newFile := NewSwarmFile(sd.path, req.Name, sd.mountInfo)
   100  	newFile.fileSize = 0 // 0 means, file is not in swarm yet and it is just created
   101  
   102  	sd.lock.Lock()
   103  	defer sd.lock.Unlock()
   104  	sd.files = append(sd.files, newFile)
   105  
   106  	return newFile, newFile, nil
   107  }
   108  
   109  func (sd *SwarmDir) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
   110  
   111  	if req.Dir && sd.directories != nil {
   112  		newDirs := []*SwarmDir{}
   113  		for _, dir := range sd.directories {
   114  			if dir.name == req.Name {
   115  				removeDirectoryFromSwarm(dir)
   116  			} else {
   117  				newDirs = append(newDirs, dir)
   118  			}
   119  		}
   120  		if len(sd.directories) > len(newDirs) {
   121  			sd.lock.Lock()
   122  			defer sd.lock.Unlock()
   123  			sd.directories = newDirs
   124  		}
   125  		return nil
   126  	} else if !req.Dir && sd.files != nil {
   127  		newFiles := []*SwarmFile{}
   128  		for _, f := range sd.files {
   129  			if f.name == req.Name {
   130  				removeFileFromSwarm(f)
   131  			} else {
   132  				newFiles = append(newFiles, f)
   133  			}
   134  		}
   135  		if len(sd.files) > len(newFiles) {
   136  			sd.lock.Lock()
   137  			defer sd.lock.Unlock()
   138  			sd.files = newFiles
   139  		}
   140  		return nil
   141  	}
   142  	return fuse.ENOENT
   143  }
   144  
   145  func (sd *SwarmDir) Mkdir(ctx context.Context, req *fuse.MkdirRequest) (fs.Node, error) {
   146  
   147  	newDir := NewSwarmDir(req.Name, sd.mountInfo)
   148  
   149  	sd.lock.Lock()
   150  	defer sd.lock.Unlock()
   151  	sd.directories = append(sd.directories, newDir)
   152  
   153  	return newDir, nil
   154  
   155  }