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package filesys
import (
"context"
"fmt"
"math"
"os"
"strings"
"sync"
"time"
"github.com/karlseguin/ccache"
"google.golang.org/grpc"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
"github.com/chrislusf/seaweedfs/weed/util"
"github.com/seaweedfs/fuse"
"github.com/seaweedfs/fuse/fs"
)
type Option struct {
FilerGrpcAddress string
GrpcDialOption grpc.DialOption
FilerMountRootPath string
Collection string
Replication string
TtlSec int32
ChunkSizeLimit int64
DataCenter string
DirListCacheLimit int64
EntryCacheTtl time.Duration
Umask os.FileMode
MountUid uint32
MountGid uint32
MountMode os.FileMode
MountCtime time.Time
MountMtime time.Time
}
var _ = fs.FS(&WFS{})
var _ = fs.FSStatfser(&WFS{})
type WFS struct {
option *Option
listDirectoryEntriesCache *ccache.Cache
// contains all open handles, protected by handlesLock
handlesLock sync.Mutex
handles []*FileHandle
pathToHandleIndex map[filer2.FullPath]int
bufPool sync.Pool
stats statsCache
// nodes, protected by nodesLock
nodesLock sync.Mutex
nodes map[uint64]fs.Node
root fs.Node
}
type statsCache struct {
filer_pb.StatisticsResponse
lastChecked int64 // unix time in seconds
}
func NewSeaweedFileSystem(option *Option) *WFS {
wfs := &WFS{
option: option,
listDirectoryEntriesCache: ccache.New(ccache.Configure().MaxSize(option.DirListCacheLimit * 3).ItemsToPrune(100)),
pathToHandleIndex: make(map[filer2.FullPath]int),
bufPool: sync.Pool{
New: func() interface{} {
return make([]byte, option.ChunkSizeLimit)
},
},
nodes: make(map[uint64]fs.Node),
}
wfs.root = &Dir{Path: wfs.option.FilerMountRootPath, wfs: wfs}
return wfs
}
func (wfs *WFS) Root() (fs.Node, error) {
return wfs.root, nil
}
func (wfs *WFS) WithFilerClient(ctx context.Context, fn func(context.Context, filer_pb.SeaweedFilerClient) error) error {
err := util.WithCachedGrpcClient(ctx, func(ctx2 context.Context, grpcConnection *grpc.ClientConn) error {
client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(ctx2, client)
}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
if err == nil {
return nil
}
if strings.Contains(err.Error(), "context canceled") {
time.Sleep(3337 * time.Millisecond)
glog.V(2).Infoln("retry context canceled request...")
return util.WithCachedGrpcClient(context.Background(), func(ctx2 context.Context, grpcConnection *grpc.ClientConn) error {
client := filer_pb.NewSeaweedFilerClient(grpcConnection)
return fn(ctx2, client)
}, wfs.option.FilerGrpcAddress, wfs.option.GrpcDialOption)
}
return err
}
func (wfs *WFS) AcquireHandle(file *File, uid, gid uint32) (fileHandle *FileHandle) {
fullpath := file.fullpath()
glog.V(4).Infof("%s AcquireHandle uid=%d gid=%d", fullpath, uid, gid)
wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
index, found := wfs.pathToHandleIndex[fullpath]
if found && wfs.handles[index] != nil {
glog.V(2).Infoln(fullpath, "found fileHandle id", index)
return wfs.handles[index]
}
fileHandle = newFileHandle(file, uid, gid)
for i, h := range wfs.handles {
if h == nil {
wfs.handles[i] = fileHandle
fileHandle.handle = uint64(i)
wfs.pathToHandleIndex[fullpath] = i
glog.V(4).Infof("%s reuse fh %d", fullpath, fileHandle.handle)
return
}
}
wfs.handles = append(wfs.handles, fileHandle)
fileHandle.handle = uint64(len(wfs.handles) - 1)
wfs.pathToHandleIndex[fullpath] = int(fileHandle.handle)
glog.V(4).Infof("%s new fh %d", fullpath, fileHandle.handle)
return
}
func (wfs *WFS) ReleaseHandle(fullpath filer2.FullPath, handleId fuse.HandleID) {
wfs.handlesLock.Lock()
defer wfs.handlesLock.Unlock()
glog.V(4).Infof("%s ReleaseHandle id %d current handles length %d", fullpath, handleId, len(wfs.handles))
delete(wfs.pathToHandleIndex, fullpath)
if int(handleId) < len(wfs.handles) {
wfs.handles[int(handleId)] = nil
}
return
}
// Statfs is called to obtain file system metadata. Implements fuse.FSStatfser
func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.StatfsResponse) error {
glog.V(4).Infof("reading fs stats: %+v", req)
if wfs.stats.lastChecked < time.Now().Unix()-20 {
err := wfs.WithFilerClient(ctx, func(ctx context.Context, client filer_pb.SeaweedFilerClient) error {
request := &filer_pb.StatisticsRequest{
Collection: wfs.option.Collection,
Replication: wfs.option.Replication,
Ttl: fmt.Sprintf("%ds", wfs.option.TtlSec),
}
glog.V(4).Infof("reading filer stats: %+v", request)
resp, err := client.Statistics(ctx, request)
if err != nil {
glog.V(0).Infof("reading filer stats %v: %v", request, err)
return err
}
glog.V(4).Infof("read filer stats: %+v", resp)
wfs.stats.TotalSize = resp.TotalSize
wfs.stats.UsedSize = resp.UsedSize
wfs.stats.FileCount = resp.FileCount
wfs.stats.lastChecked = time.Now().Unix()
return nil
})
if err != nil {
glog.V(0).Infof("filer Statistics: %v", err)
return err
}
}
totalDiskSize := wfs.stats.TotalSize
usedDiskSize := wfs.stats.UsedSize
actualFileCount := wfs.stats.FileCount
// Compute the total number of available blocks
resp.Blocks = totalDiskSize / blockSize
// Compute the number of used blocks
numBlocks := uint64(usedDiskSize / blockSize)
// Report the number of free and available blocks for the block size
resp.Bfree = resp.Blocks - numBlocks
resp.Bavail = resp.Blocks - numBlocks
resp.Bsize = uint32(blockSize)
// Report the total number of possible files in the file system (and those free)
resp.Files = math.MaxInt64
resp.Ffree = math.MaxInt64 - actualFileCount
// Report the maximum length of a name and the minimum fragment size
resp.Namelen = 1024
resp.Frsize = uint32(blockSize)
return nil
}
func (wfs *WFS) cacheGet(path filer2.FullPath) *filer_pb.Entry {
item := wfs.listDirectoryEntriesCache.Get(string(path))
if item != nil && !item.Expired() {
return item.Value().(*filer_pb.Entry)
}
return nil
}
func (wfs *WFS) cacheSet(path filer2.FullPath, entry *filer_pb.Entry, ttl time.Duration) {
if entry == nil {
wfs.listDirectoryEntriesCache.Delete(string(path))
} else {
wfs.listDirectoryEntriesCache.Set(string(path), entry, ttl)
}
}
func (wfs *WFS) cacheDelete(path filer2.FullPath) {
wfs.listDirectoryEntriesCache.Delete(string(path))
}
func (wfs *WFS) getNode(fullpath filer2.FullPath, fn func() fs.Node) fs.Node {
wfs.nodesLock.Lock()
defer wfs.nodesLock.Unlock()
node, found := wfs.nodes[fullpath.AsInode()]
if found {
return node
}
node = fn()
if node != nil {
wfs.nodes[fullpath.AsInode()] = node
}
return node
}
func (wfs *WFS) forgetNode(fullpath filer2.FullPath) {
wfs.nodesLock.Lock()
defer wfs.nodesLock.Unlock()
delete(wfs.nodes, fullpath.AsInode())
}
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