1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
// 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 (
"errors"
"io"
"os"
"sync"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/ethereum/go-ethereum/swarm/log"
"github.com/ethereum/go-ethereum/swarm/storage"
"golang.org/x/net/context"
)
const (
MaxAppendFileSize = 10485760 // 10Mb
)
var (
errInvalidOffset = errors.New("Invalid offset during write")
errFileSizeMaxLimixReached = errors.New("File size exceeded max limit")
)
var (
_ fs.Node = (*SwarmFile)(nil)
_ fs.HandleReader = (*SwarmFile)(nil)
_ fs.HandleWriter = (*SwarmFile)(nil)
)
type SwarmFile struct {
inode uint64
name string
path string
addr storage.Address
fileSize int64
reader storage.LazySectionReader
mountInfo *MountInfo
lock *sync.RWMutex
}
func NewSwarmFile(path, fname string, minfo *MountInfo) *SwarmFile {
newFile := &SwarmFile{
inode: NewInode(),
name: fname,
path: path,
addr: nil,
fileSize: -1, // -1 means , file already exists in swarm and you need to just get the size from swarm
reader: nil,
mountInfo: minfo,
lock: &sync.RWMutex{},
}
return newFile
}
func (sf *SwarmFile) Attr(ctx context.Context, a *fuse.Attr) error {
log.Debug("swarmfs Attr", "path", sf.path)
sf.lock.Lock()
defer sf.lock.Unlock()
a.Inode = sf.inode
//TODO: need to get permission as argument
a.Mode = 0700
a.Uid = uint32(os.Getuid())
a.Gid = uint32(os.Getegid())
if sf.fileSize == -1 {
reader, _ := sf.mountInfo.swarmApi.Retrieve(ctx, sf.addr)
quitC := make(chan bool)
size, err := reader.Size(ctx, quitC)
if err != nil {
log.Error("Couldnt get size of file %s : %v", sf.path, err)
return err
}
sf.fileSize = size
log.Trace("swarmfs Attr", "size", size)
close(quitC)
}
a.Size = uint64(sf.fileSize)
return nil
}
func (sf *SwarmFile) Read(ctx context.Context, req *fuse.ReadRequest, resp *fuse.ReadResponse) error {
log.Debug("swarmfs Read", "path", sf.path, "req.String", req.String())
sf.lock.RLock()
defer sf.lock.RUnlock()
if sf.reader == nil {
sf.reader, _ = sf.mountInfo.swarmApi.Retrieve(ctx, sf.addr)
}
buf := make([]byte, req.Size)
n, err := sf.reader.ReadAt(buf, req.Offset)
if err == io.ErrUnexpectedEOF || err == io.EOF {
err = nil
}
resp.Data = buf[:n]
sf.reader = nil
return err
}
func (sf *SwarmFile) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
log.Debug("swarmfs Write", "path", sf.path, "req.String", req.String())
if sf.fileSize == 0 && req.Offset == 0 {
// A new file is created
err := addFileToSwarm(sf, req.Data, len(req.Data))
if err != nil {
return err
}
resp.Size = len(req.Data)
} else if req.Offset <= sf.fileSize {
totalSize := sf.fileSize + int64(len(req.Data))
if totalSize > MaxAppendFileSize {
log.Warn("swarmfs Append file size reached (%v) : (%v)", sf.fileSize, len(req.Data))
return errFileSizeMaxLimixReached
}
err := appendToExistingFileInSwarm(sf, req.Data, req.Offset, int64(len(req.Data)))
if err != nil {
return err
}
resp.Size = len(req.Data)
} else {
log.Warn("swarmfs Invalid write request size(%v) : off(%v)", sf.fileSize, req.Offset)
return errInvalidOffset
}
return nil
}
|
