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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 (
"errors"
"fmt"
"os"
"path/filepath"
"strings"
"sync"
"time"
"bazil.org/fuse"
"bazil.org/fuse/fs"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/swarm/api"
)
var (
errEmptyMountPoint = errors.New("need non-empty mount point")
errMaxMountCount = errors.New("max FUSE mount count reached")
errMountTimeout = errors.New("mount timeout")
errAlreadyMounted = errors.New("mount point is already serving")
)
func isFUSEUnsupportedError(err error) bool {
if perr, ok := err.(*os.PathError); ok {
return perr.Op == "open" && perr.Path == "/dev/fuse"
}
return err == fuse.ErrOSXFUSENotFound
}
// information about every active mount
type MountInfo struct {
MountPoint string
StartManifest string
LatestManifest string
rootDir *SwarmDir
fuseConnection *fuse.Conn
swarmApi *api.Api
lock *sync.RWMutex
}
// Inode numbers need to be unique, they are used for caching inside fuse
func newInode() uint64 {
inodeLock.Lock()
defer inodeLock.Unlock()
inode += 1
return inode
}
func NewMountInfo(mhash, mpoint string, sapi *api.Api) *MountInfo {
newMountInfo := &MountInfo{
MountPoint: mpoint,
StartManifest: mhash,
LatestManifest: mhash,
rootDir: nil,
fuseConnection: nil,
swarmApi: sapi,
lock: &sync.RWMutex{},
}
return newMountInfo
}
func (self *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
if mountpoint == "" {
return nil, errEmptyMountPoint
}
cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
if err != nil {
return nil, err
}
self.swarmFsLock.Lock()
defer self.swarmFsLock.Unlock()
noOfActiveMounts := len(self.activeMounts)
if noOfActiveMounts >= maxFuseMounts {
return nil, errMaxMountCount
}
if _, ok := self.activeMounts[cleanedMountPoint]; ok {
return nil, errAlreadyMounted
}
log.Info(fmt.Sprintf("Attempting to mount %s ", cleanedMountPoint))
key, manifestEntryMap, err := self.swarmApi.BuildDirectoryTree(mhash, true)
if err != nil {
return nil, err
}
mi := NewMountInfo(mhash, cleanedMountPoint, self.swarmApi)
dirTree := map[string]*SwarmDir{}
rootDir := NewSwarmDir("/", mi)
dirTree["/"] = rootDir
mi.rootDir = rootDir
for suffix, entry := range manifestEntryMap {
key = common.Hex2Bytes(entry.Hash)
fullpath := "/" + suffix
basepath := filepath.Dir(fullpath)
parentDir := rootDir
dirUntilNow := ""
paths := strings.Split(basepath, "/")
for i := range paths {
if paths[i] != "" {
thisDir := paths[i]
dirUntilNow = dirUntilNow + "/" + thisDir
if _, ok := dirTree[dirUntilNow]; !ok {
dirTree[dirUntilNow] = NewSwarmDir(dirUntilNow, mi)
parentDir.directories = append(parentDir.directories, dirTree[dirUntilNow])
parentDir = dirTree[dirUntilNow]
} else {
parentDir = dirTree[dirUntilNow]
}
}
}
thisFile := NewSwarmFile(basepath, filepath.Base(fullpath), mi)
thisFile.key = key
parentDir.files = append(parentDir.files, thisFile)
}
fconn, err := fuse.Mount(cleanedMountPoint, fuse.FSName("swarmfs"), fuse.VolumeName(mhash))
if isFUSEUnsupportedError(err) {
log.Warn("Fuse not installed", "mountpoint", cleanedMountPoint, "err", err)
return nil, err
} else if err != nil {
fuse.Unmount(cleanedMountPoint)
log.Warn("Error mounting swarm manifest", "mountpoint", cleanedMountPoint, "err", err)
return nil, err
}
mi.fuseConnection = fconn
serverr := make(chan error, 1)
go func() {
log.Info(fmt.Sprintf("Serving %s at %s", mhash, cleanedMountPoint))
filesys := &SwarmRoot{root: rootDir}
if err := fs.Serve(fconn, filesys); err != nil {
log.Warn(fmt.Sprintf("Could not Serve SwarmFileSystem error: %v", err))
serverr <- err
}
}()
// Check if the mount process has an error to report.
select {
case <-time.After(mountTimeout):
fuse.Unmount(cleanedMountPoint)
return nil, errMountTimeout
case err := <-serverr:
fuse.Unmount(cleanedMountPoint)
log.Warn("Error serving swarm FUSE FS", "mountpoint", cleanedMountPoint, "err", err)
return nil, err
case <-fconn.Ready:
log.Info("Now serving swarm FUSE FS", "manifest", mhash, "mountpoint", cleanedMountPoint)
}
self.activeMounts[cleanedMountPoint] = mi
return mi, nil
}
func (self *SwarmFS) Unmount(mountpoint string) (*MountInfo, error) {
self.swarmFsLock.Lock()
defer self.swarmFsLock.Unlock()
cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
if err != nil {
return nil, err
}
mountInfo := self.activeMounts[cleanedMountPoint]
if mountInfo == nil || mountInfo.MountPoint != cleanedMountPoint {
return nil, fmt.Errorf("%s is not mounted", cleanedMountPoint)
}
err = fuse.Unmount(cleanedMountPoint)
if err != nil {
err1 := externalUnmount(cleanedMountPoint)
if err1 != nil {
errStr := fmt.Sprintf("UnMount error: %v", err)
log.Warn(errStr)
return nil, err1
}
}
mountInfo.fuseConnection.Close()
delete(self.activeMounts, cleanedMountPoint)
succString := fmt.Sprintf("UnMounting %v succeeded", cleanedMountPoint)
log.Info(succString)
return mountInfo, nil
}
func (self *SwarmFS) Listmounts() []*MountInfo {
self.swarmFsLock.RLock()
defer self.swarmFsLock.RUnlock()
rows := make([]*MountInfo, 0, len(self.activeMounts))
for _, mi := range self.activeMounts {
rows = append(rows, mi)
}
return rows
}
func (self *SwarmFS) Stop() bool {
for mp := range self.activeMounts {
mountInfo := self.activeMounts[mp]
self.Unmount(mountInfo.MountPoint)
}
return true
}
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