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swarm: network rewrite merge

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This commit is contained in:
ethersphere
2018-06-20 14:06:27 +02:00
parent 574378edb5
commit e187711c65
201 changed files with 39605 additions and 9921 deletions
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156
swarm/fuse/swarmfs_unix.go
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@@ -30,15 +30,16 @@ import (
"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"
"github.com/ethereum/go-ethereum/swarm/log"
)
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")
errEmptyMountPoint = errors.New("need non-empty mount point")
errNoRelativeMountPoint = errors.New("invalid path for mount point (need absolute path)")
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 {
@@ -48,18 +49,20 @@ func isFUSEUnsupportedError(err error) bool {
return err == fuse.ErrOSXFUSENotFound
}
// information about every active mount
// MountInfo contains information about every active mount
type MountInfo struct {
MountPoint string
StartManifest string
LatestManifest string
rootDir *SwarmDir
fuseConnection *fuse.Conn
swarmApi *api.Api
swarmApi *api.API
lock *sync.RWMutex
serveClose chan struct{}
}
func NewMountInfo(mhash, mpoint string, sapi *api.Api) *MountInfo {
func NewMountInfo(mhash, mpoint string, sapi *api.API) *MountInfo {
log.Debug("swarmfs NewMountInfo", "hash", mhash, "mount point", mpoint)
newMountInfo := &MountInfo{
MountPoint: mpoint,
StartManifest: mhash,
@@ -68,50 +71,57 @@ func NewMountInfo(mhash, mpoint string, sapi *api.Api) *MountInfo {
fuseConnection: nil,
swarmApi: sapi,
lock: &sync.RWMutex{},
serveClose: make(chan struct{}),
}
return newMountInfo
}
func (self *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
func (swarmfs *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
log.Info("swarmfs", "mounting hash", mhash, "mount point", mountpoint)
if mountpoint == "" {
return nil, errEmptyMountPoint
}
if !strings.HasPrefix(mountpoint, "/") {
return nil, errNoRelativeMountPoint
}
cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
if err != nil {
return nil, err
}
log.Trace("swarmfs mount", "cleanedMountPoint", cleanedMountPoint)
self.swarmFsLock.Lock()
defer self.swarmFsLock.Unlock()
swarmfs.swarmFsLock.Lock()
defer swarmfs.swarmFsLock.Unlock()
noOfActiveMounts := len(self.activeMounts)
noOfActiveMounts := len(swarmfs.activeMounts)
log.Debug("swarmfs mount", "# active mounts", noOfActiveMounts)
if noOfActiveMounts >= maxFuseMounts {
return nil, errMaxMountCount
}
if _, ok := self.activeMounts[cleanedMountPoint]; ok {
if _, ok := swarmfs.activeMounts[cleanedMountPoint]; ok {
return nil, errAlreadyMounted
}
log.Info(fmt.Sprintf("Attempting to mount %s ", cleanedMountPoint))
_, manifestEntryMap, err := self.swarmApi.BuildDirectoryTree(mhash, true)
log.Trace("swarmfs mount: getting manifest tree")
_, manifestEntryMap, err := swarmfs.swarmApi.BuildDirectoryTree(mhash, true)
if err != nil {
return nil, err
}
mi := NewMountInfo(mhash, cleanedMountPoint, self.swarmApi)
log.Trace("swarmfs mount: building mount info")
mi := NewMountInfo(mhash, cleanedMountPoint, swarmfs.swarmApi)
dirTree := map[string]*SwarmDir{}
rootDir := NewSwarmDir("/", mi)
dirTree["/"] = rootDir
log.Trace("swarmfs mount", "rootDir", rootDir)
mi.rootDir = rootDir
log.Trace("swarmfs mount: traversing manifest map")
for suffix, entry := range manifestEntryMap {
key := common.Hex2Bytes(entry.Hash)
addr := common.Hex2Bytes(entry.Hash)
fullpath := "/" + suffix
basepath := filepath.Dir(fullpath)
parentDir := rootDir
dirUntilNow := ""
paths := strings.Split(basepath, "/")
@@ -128,105 +138,143 @@ func (self *SwarmFS) Mount(mhash, mountpoint string) (*MountInfo, error) {
} else {
parentDir = dirTree[dirUntilNow]
}
}
}
thisFile := NewSwarmFile(basepath, filepath.Base(fullpath), mi)
thisFile.key = key
thisFile.addr = addr
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)
log.Error("swarmfs error - 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)
log.Error("swarmfs 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))
log.Info("swarmfs", "serving hash", mhash, "at", cleanedMountPoint)
filesys := &SwarmRoot{root: rootDir}
//start serving the actual file system; see note below
if err := fs.Serve(fconn, filesys); err != nil {
log.Warn(fmt.Sprintf("Could not Serve SwarmFileSystem error: %v", err))
log.Warn("swarmfs could not serve the requested hash", "error", err)
serverr <- err
}
mi.serveClose <- struct{}{}
}()
/*
IMPORTANT NOTE: the fs.Serve function is blocking;
Serve builds up the actual fuse file system by calling the
Attr functions on each SwarmFile, creating the file inodes;
specifically calling the swarm's LazySectionReader.Size() to set the file size.
This can take some time, and it appears that if we access the fuse file system
too early, we can bring the tests to deadlock. The assumption so far is that
at this point, the fuse driver didn't finish to initialize the file system.
Accessing files too early not only deadlocks the tests, but locks the access
of the fuse file completely, resulting in blocked resources at OS system level.
Even a simple `ls /tmp/testDir/testMountDir` could deadlock in a shell.
Workaround so far is to wait some time to give the OS enough time to initialize
the fuse file system. During tests, this seemed to address the issue.
HOWEVER IT SHOULD BE NOTED THAT THIS MAY ONLY BE AN EFFECT,
AND THE DEADLOCK CAUSED BY SOMETHING ELSE BLOCKING ACCESS DUE TO SOME RACE CONDITION
(caused in the bazil.org library and/or the SwarmRoot, SwarmDir and SwarmFile implementations)
*/
time.Sleep(2 * time.Second)
timer := time.NewTimer(mountTimeout)
defer timer.Stop()
// Check if the mount process has an error to report.
select {
case <-time.After(mountTimeout):
fuse.Unmount(cleanedMountPoint)
case <-timer.C:
log.Warn("swarmfs timed out mounting over FUSE", "mountpoint", cleanedMountPoint, "err", err)
err := fuse.Unmount(cleanedMountPoint)
if err != nil {
return nil, err
}
return nil, errMountTimeout
case err := <-serverr:
fuse.Unmount(cleanedMountPoint)
log.Warn("Error serving swarm FUSE FS", "mountpoint", cleanedMountPoint, "err", err)
log.Warn("swarmfs error serving over FUSE", "mountpoint", cleanedMountPoint, "err", err)
err = fuse.Unmount(cleanedMountPoint)
return nil, err
case <-fconn.Ready:
log.Info("Now serving swarm FUSE FS", "manifest", mhash, "mountpoint", cleanedMountPoint)
//this signals that the actual mount point from the fuse.Mount call is ready;
//it does not signal though that the file system from fs.Serve is actually fully built up
if err := fconn.MountError; err != nil {
log.Error("Mounting error from fuse driver: ", "err", err)
return nil, err
}
log.Info("swarmfs now served over FUSE", "manifest", mhash, "mountpoint", cleanedMountPoint)
}
self.activeMounts[cleanedMountPoint] = mi
timer.Stop()
swarmfs.activeMounts[cleanedMountPoint] = mi
return mi, nil
}
func (self *SwarmFS) Unmount(mountpoint string) (*MountInfo, error) {
self.swarmFsLock.Lock()
defer self.swarmFsLock.Unlock()
func (swarmfs *SwarmFS) Unmount(mountpoint string) (*MountInfo, error) {
swarmfs.swarmFsLock.Lock()
defer swarmfs.swarmFsLock.Unlock()
cleanedMountPoint, err := filepath.Abs(filepath.Clean(mountpoint))
if err != nil {
return nil, err
}
mountInfo := self.activeMounts[cleanedMountPoint]
mountInfo := swarmfs.activeMounts[cleanedMountPoint]
if mountInfo == nil || mountInfo.MountPoint != cleanedMountPoint {
return nil, fmt.Errorf("%s is not mounted", cleanedMountPoint)
return nil, fmt.Errorf("swarmfs %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)
errStr := fmt.Sprintf("swarmfs unmount error: %v", err)
log.Warn(errStr)
return nil, err1
}
}
mountInfo.fuseConnection.Close()
delete(self.activeMounts, cleanedMountPoint)
err = mountInfo.fuseConnection.Close()
if err != nil {
return nil, err
}
delete(swarmfs.activeMounts, cleanedMountPoint)
succString := fmt.Sprintf("UnMounting %v succeeded", cleanedMountPoint)
<-mountInfo.serveClose
succString := fmt.Sprintf("swarmfs 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 {
func (swarmfs *SwarmFS) Listmounts() []*MountInfo {
swarmfs.swarmFsLock.RLock()
defer swarmfs.swarmFsLock.RUnlock()
rows := make([]*MountInfo, 0, len(swarmfs.activeMounts))
for _, mi := range swarmfs.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)
func (swarmfs *SwarmFS) Stop() bool {
for mp := range swarmfs.activeMounts {
mountInfo := swarmfs.activeMounts[mp]
swarmfs.Unmount(mountInfo.MountPoint)
}
return true
}