608 lines
14 KiB
Go
608 lines
14 KiB
Go
package fusefs
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import (
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"bytes"
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"context"
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"io"
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"strconv"
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"syscall"
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"github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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"go.arsenm.dev/infinitime"
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"go.arsenm.dev/infinitime/blefs"
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"go.arsenm.dev/logger/log"
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)
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type ITProperty struct {
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name string
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Ino uint64
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gen func() ([]byte, error)
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}
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type DirEntry struct {
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isDir bool
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modtime uint64
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size uint32
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path string
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}
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type ITNode struct {
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fs.Inode
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kind nodeKind
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Ino uint64
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lst []DirEntry
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self DirEntry
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path string
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}
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type nodeKind uint8
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const (
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nodeKindRoot = iota
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nodeKindInfo
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nodeKindFS
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nodeKindReadOnly
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)
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var (
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myfs *blefs.FS = nil
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inodemap map[string]uint64 = nil
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)
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func BuildRootNode(dev *infinitime.Device) (*ITNode, error) {
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var err error
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inodemap = make(map[string]uint64)
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myfs, err = dev.FS()
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if err != nil {
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log.Error("FUSE Failed to get filesystem").Err(err).Send()
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return nil, err
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}
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return &ITNode{kind: nodeKindRoot}, nil
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}
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var properties = make([]ITProperty, 6)
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func BuildProperties(dev *infinitime.Device) {
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properties[0] = ITProperty{
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"heartrate", 2,
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func() ([]byte, error) {
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ans, err := dev.HeartRate()
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return []byte(strconv.Itoa(int(ans)) + "\n"), err
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},
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}
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properties[1] = ITProperty{
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"battery", 3,
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func() ([]byte, error) {
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ans, err := dev.BatteryLevel()
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return []byte(strconv.Itoa(int(ans)) + "\n"), err
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},
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}
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properties[2] = ITProperty{
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"motion", 4,
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func() ([]byte, error) {
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ans, err := dev.Motion()
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return []byte(strconv.Itoa(int(ans.X)) + " " + strconv.Itoa(int(ans.Y)) + " " + strconv.Itoa(int(ans.Z)) + "\n"), err
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},
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}
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properties[3] = ITProperty{
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"stepcount", 6,
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func() ([]byte, error) {
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ans, err := dev.StepCount()
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return []byte(strconv.Itoa(int(ans)) + "\n"), err
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},
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}
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properties[4] = ITProperty{
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"version", 7,
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func() ([]byte, error) {
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ans, err := dev.Version()
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return []byte(ans + "\n"), err
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},
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}
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properties[5] = ITProperty{
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"address", 8,
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func() ([]byte, error) {
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ans := dev.Address()
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return []byte(ans + "\n"), nil
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},
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}
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}
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var _ fs.NodeReaddirer = (*ITNode)(nil)
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// Readdir is part of the NodeReaddirer interface
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func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
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switch n.kind {
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case 0:
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// root folder
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r := make([]fuse.DirEntry, 2)
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r[0] = fuse.DirEntry{
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Name: "info",
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Ino: 0,
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Mode: fuse.S_IFDIR,
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}
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r[1] = fuse.DirEntry{
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Name: "fs",
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Ino: 1,
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Mode: fuse.S_IFDIR,
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}
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return fs.NewListDirStream(r), 0
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case 1:
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// info folder
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r := make([]fuse.DirEntry, 6)
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for ind, value := range properties {
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r[ind] = fuse.DirEntry{
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Name: value.name,
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Ino: value.Ino,
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Mode: fuse.S_IFREG,
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}
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}
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return fs.NewListDirStream(r), 0
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case 2:
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// on info
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files, err := myfs.ReadDir(n.path)
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if err != nil {
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log.Error("FUSE ReadDir failed").Str("path", n.path).Err(err).Send()
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return nil, syscallErr(err)
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}
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log.Debug("FUSE ReadDir succeeded").Str("path", n.path).Int("objects", len(files)).Send()
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r := make([]fuse.DirEntry, len(files))
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n.lst = make([]DirEntry, len(files))
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for ind, entry := range files {
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info, err := entry.Info()
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if err != nil {
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log.Error("FUSE Info failed").Str("path", n.path).Err(err).Send()
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return nil, syscallErr(err)
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}
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name := info.Name()
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file := DirEntry{
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path: n.path + "/" + name,
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size: uint32(info.Size()),
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modtime: uint64(info.ModTime().Unix()),
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isDir: info.IsDir(),
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}
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n.lst[ind] = file
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ino := inodemap[file.path]
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if ino == 0 {
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ino = uint64(len(inodemap)) + 1
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inodemap[file.path] = ino
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}
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if file.isDir {
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r[ind] = fuse.DirEntry{
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Name: name,
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Mode: fuse.S_IFDIR,
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Ino: ino + 10,
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}
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} else {
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r[ind] = fuse.DirEntry{
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Name: name,
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Mode: fuse.S_IFREG,
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Ino: ino + 10,
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}
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}
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}
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return fs.NewListDirStream(r), 0
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}
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r := make([]fuse.DirEntry, 0)
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return fs.NewListDirStream(r), 0
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}
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var _ fs.NodeLookuper = (*ITNode)(nil)
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func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
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switch n.kind {
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case 0:
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// root folder
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if name == "info" {
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stable := fs.StableAttr{
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Mode: fuse.S_IFDIR,
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Ino: uint64(0),
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}
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operations := &ITNode{kind: nodeKindInfo, Ino: 0}
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child := n.NewInode(ctx, operations, stable)
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return child, 0
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} else if name == "fs" {
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stable := fs.StableAttr{
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Mode: fuse.S_IFDIR,
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Ino: uint64(1),
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}
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operations := &ITNode{kind: nodeKindFS, Ino: 1, path: ""}
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child := n.NewInode(ctx, operations, stable)
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return child, 0
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}
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case 1:
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// info folder
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for _, value := range properties {
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if value.name == name {
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stable := fs.StableAttr{
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Mode: fuse.S_IFREG,
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Ino: uint64(value.Ino),
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}
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operations := &ITNode{kind: nodeKindReadOnly, Ino: value.Ino}
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child := n.NewInode(ctx, operations, stable)
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return child, 0
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}
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}
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case 2:
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// FS object
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if len(n.lst) == 0 {
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n.Readdir(ctx)
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}
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for _, file := range n.lst {
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if file.path != n.path+"/"+name {
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continue
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}
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log.Debug("FUSE Lookup successful").Str("path", file.path).Send()
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if file.isDir {
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stable := fs.StableAttr{
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Mode: fuse.S_IFDIR,
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Ino: inodemap[file.path],
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}
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operations := &ITNode{kind: nodeKindFS, path: file.path}
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child := n.NewInode(ctx, operations, stable)
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return child, 0
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} else {
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stable := fs.StableAttr{
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Mode: fuse.S_IFREG,
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Ino: inodemap[file.path],
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}
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operations := &ITNode{
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kind: nodeKindFS, path: file.path,
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self: file,
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}
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child := n.NewInode(ctx, operations, stable)
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return child, 0
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}
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}
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log.Warn("FUSE Lookup failed").Str("path", n.path+"/"+name).Send()
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}
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return nil, syscall.ENOENT
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}
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type bytesFileReadHandle struct {
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content []byte
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}
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var _ fs.FileReader = (*bytesFileReadHandle)(nil)
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func (fh *bytesFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
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log.Debug("FUSE Executing Read").Int("size", len(fh.content)).Send()
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end := off + int64(len(dest))
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if end > int64(len(fh.content)) {
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end = int64(len(fh.content))
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}
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return fuse.ReadResultData(fh.content[off:end]), 0
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}
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type sensorFileReadHandle struct {
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content []byte
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}
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var _ fs.FileReader = (*sensorFileReadHandle)(nil)
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func (fh *sensorFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
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log.Debug("FUSE Executing Read").Int("size", len(fh.content)).Send()
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end := off + int64(len(dest))
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if end > int64(len(fh.content)) {
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end = int64(len(fh.content))
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}
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return fuse.ReadResultData(fh.content[off:end]), 0
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}
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var _ fs.FileFlusher = (*sensorFileReadHandle)(nil)
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func (fh *sensorFileReadHandle) Flush(ctx context.Context) (errno syscall.Errno) {
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return 0
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}
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type bytesFileWriteHandle struct {
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content []byte
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path string
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}
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var _ fs.FileWriter = (*bytesFileWriteHandle)(nil)
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func (fh *bytesFileWriteHandle) Write(ctx context.Context, data []byte, off int64) (written uint32, errno syscall.Errno) {
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log.Debug("FUSE Executing Write").Str("path", fh.path).Int("prev_size", len(fh.content)).Int("next_size", len(data)).Send()
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if off != int64(len(fh.content)) {
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log.Error("FUSE Write file size changed unexpectedly").Int("expect", int(off)).Int("received", len(fh.content)).Send()
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return 0, syscall.ENXIO
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}
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fh.content = append(fh.content[:], data[:]...)
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return uint32(len(data)), 0
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}
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var _ fs.FileFlusher = (*bytesFileWriteHandle)(nil)
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func (fh *bytesFileWriteHandle) Flush(ctx context.Context) (errno syscall.Errno) {
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log.Debug("FUSE Attempting flush").Str("path", fh.path).Send()
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fp, err := myfs.Create(fh.path, uint32(len(fh.content)))
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if err != nil {
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log.Error("FUSE Flush failed: create").Str("path", fh.path).Err(err).Send()
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return syscallErr(err)
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}
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if len(fh.content) == 0 {
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log.Debug("FUSE Flush no data to write").Str("path", fh.path).Send()
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err = fp.Close()
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if err != nil {
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log.Error("FUSE Flush failed during close").Str("path", fh.path).Err(err).Send()
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return syscallErr(err)
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}
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return 0
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}
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go func() {
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// For every progress event
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for sent := range fp.Progress() {
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log.Debug("FUSE Flush progress").Int("bytes", int(sent)).Int("total", len(fh.content)).Send()
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}
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}()
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r := bytes.NewReader(fh.content)
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nread, err := io.Copy(fp, r)
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if err != nil {
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log.Error("FUSE Flush failed during write").Str("path", fh.path).Err(err).Send()
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fp.Close()
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return syscallErr(err)
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}
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if int(nread) != len(fh.content) {
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log.Error("FUSE Flush failed during write").Str("path", fh.path).Int("expect", len(fh.content)).Int("got", int(nread)).Send()
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fp.Close()
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return syscall.EIO
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}
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err = fp.Close()
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if err != nil {
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log.Error("FUSE Flush failed during close").Str("path", fh.path).Err(err).Send()
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return syscallErr(err)
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}
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log.Debug("FUSE Flush done").Str("path", fh.path).Int("size", len(fh.content)).Send()
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return 0
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}
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var _ fs.FileFsyncer = (*bytesFileWriteHandle)(nil)
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func (fh *bytesFileWriteHandle) Fsync(ctx context.Context, flags uint32) (errno syscall.Errno) {
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return fh.Flush(ctx)
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}
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var _ fs.NodeGetattrer = (*ITNode)(nil)
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func (bn *ITNode) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
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log.Debug("FUSE getattr").Str("path", bn.path).Send()
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out.Ino = bn.Ino
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out.Mtime = bn.self.modtime
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out.Ctime = bn.self.modtime
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out.Atime = bn.self.modtime
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out.Size = uint64(bn.self.size)
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return 0
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}
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var _ fs.NodeSetattrer = (*ITNode)(nil)
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func (bn *ITNode) Setattr(ctx context.Context, fh fs.FileHandle, in *fuse.SetAttrIn, out *fuse.AttrOut) syscall.Errno {
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log.Debug("FUSE setattr").Str("path", bn.path).Send()
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out.Size = 0
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out.Mtime = 0
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return 0
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}
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var _ fs.NodeOpener = (*ITNode)(nil)
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func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
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switch f.kind {
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case 2:
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// FS file
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if openFlags&syscall.O_RDWR != 0 {
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log.Error("FUSE Open failed: RDWR").Str("path", f.path).Send()
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return nil, 0, syscall.EROFS
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}
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if openFlags&syscall.O_WRONLY != 0 {
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log.Debug("FUSE Opening for write").Str("path", f.path).Send()
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fh = &bytesFileWriteHandle{
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path: f.path,
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content: make([]byte, 0),
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}
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return fh, fuse.FOPEN_DIRECT_IO, 0
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} else {
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log.Debug("FUSE Opening for read").Str("path", f.path).Send()
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fp, err := myfs.Open(f.path)
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if err != nil {
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log.Error("FUSE: Opening failed").Str("path", f.path).Err(err).Send()
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return nil, 0, syscallErr(err)
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}
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defer fp.Close()
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b := &bytes.Buffer{}
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go func() {
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// For every progress event
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for sent := range fp.Progress() {
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log.Debug("FUSE Read progress").Int("bytes", int(sent)).Int("total", int(f.self.size)).Send()
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}
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}()
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_, err = io.Copy(b, fp)
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if err != nil {
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log.Error("FUSE Read failed").Str("path", f.path).Err(err).Send()
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fp.Close()
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return nil, 0, syscallErr(err)
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}
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fh = &bytesFileReadHandle{
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content: b.Bytes(),
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}
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return fh, fuse.FOPEN_DIRECT_IO, 0
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}
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case 3:
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// Device file
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// disallow writes
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if openFlags&(syscall.O_RDWR|syscall.O_WRONLY) != 0 {
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return nil, 0, syscall.EROFS
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}
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for _, value := range properties {
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if value.Ino == f.Ino {
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ans, err := value.gen()
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if err != nil {
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return nil, 0, syscallErr(err)
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}
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fh = &sensorFileReadHandle{
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content: ans,
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}
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return fh, fuse.FOPEN_DIRECT_IO, 0
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}
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}
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}
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return nil, 0, syscall.EINVAL
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}
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var _ fs.NodeCreater = (*ITNode)(nil)
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func (f *ITNode) Create(ctx context.Context, name string, flags uint32, mode uint32, out *fuse.EntryOut) (node *fs.Inode, fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
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if f.kind != 2 {
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return nil, nil, 0, syscall.EROFS
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}
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path := f.path + "/" + name
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ino := uint64(len(inodemap)) + 11
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inodemap[path] = ino
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stable := fs.StableAttr{
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Mode: fuse.S_IFREG,
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Ino: ino,
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}
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operations := &ITNode{
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kind: nodeKindFS, Ino: ino,
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path: path,
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}
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node = f.NewInode(ctx, operations, stable)
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fh = &bytesFileWriteHandle{
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path: path,
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content: make([]byte, 0),
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}
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log.Debug("FUSE Creating file").Str("path", path).Send()
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errno = 0
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return node, fh, fuseFlags, 0
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}
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var _ fs.NodeMkdirer = (*ITNode)(nil)
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func (f *ITNode) Mkdir(ctx context.Context, name string, mode uint32, out *fuse.EntryOut) (*fs.Inode, syscall.Errno) {
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if f.kind != 2 {
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return nil, syscall.EROFS
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}
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path := f.path + "/" + name
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err := myfs.Mkdir(path)
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if err != nil {
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log.Error("FUSE Mkdir failed").
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Str("path", path).
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Err(err).
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Send()
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return nil, syscallErr(err)
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}
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ino := uint64(len(inodemap)) + 11
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inodemap[path] = ino
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stable := fs.StableAttr{
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Mode: fuse.S_IFDIR,
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Ino: ino,
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}
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operations := &ITNode{
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kind: nodeKindFS, Ino: ino,
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path: path,
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}
|
|
node := f.NewInode(ctx, operations, stable)
|
|
|
|
log.Debug("FUSE Mkdir success").
|
|
Str("path", path).
|
|
Int("ino", int(ino)).
|
|
Send()
|
|
return node, 0
|
|
}
|
|
|
|
var _ fs.NodeRenamer = (*ITNode)(nil)
|
|
|
|
func (f *ITNode) Rename(ctx context.Context, name string, newParent fs.InodeEmbedder, newName string, flags uint32) syscall.Errno {
|
|
if f.kind != 2 {
|
|
return syscall.EROFS
|
|
}
|
|
|
|
p1 := f.path + "/" + name
|
|
p2 := newParent.EmbeddedInode().Path(nil)[2:] + "/" + newName
|
|
|
|
err := myfs.Rename(p1, p2)
|
|
if err != nil {
|
|
log.Error("FUSE Rename failed").
|
|
Str("src", p1).
|
|
Str("dest", p2).
|
|
Err(err).
|
|
Send()
|
|
|
|
return syscallErr(err)
|
|
}
|
|
log.Debug("FUSE Rename sucess").
|
|
Str("src", p1).
|
|
Str("dest", p2).
|
|
Send()
|
|
|
|
ino := inodemap[p1]
|
|
delete(inodemap, p1)
|
|
inodemap[p2] = ino
|
|
|
|
return 0
|
|
}
|
|
|
|
var _ fs.NodeUnlinker = (*ITNode)(nil)
|
|
|
|
func (f *ITNode) Unlink(ctx context.Context, name string) syscall.Errno {
|
|
if f.kind != 2 {
|
|
return syscall.EROFS
|
|
}
|
|
|
|
delete(inodemap, f.path+"/"+name)
|
|
err := myfs.Remove(f.path + "/" + name)
|
|
if err != nil {
|
|
log.Error("FUSE Unlink failed").
|
|
Str("file", f.path+"/"+name).
|
|
Err(err).
|
|
Send()
|
|
|
|
return syscallErr(err)
|
|
}
|
|
|
|
log.Debug("FUSE Unlink success").
|
|
Str("file", f.path+"/"+name).
|
|
Send()
|
|
return 0
|
|
}
|
|
|
|
var _ fs.NodeRmdirer = (*ITNode)(nil)
|
|
|
|
func (f *ITNode) Rmdir(ctx context.Context, name string) syscall.Errno {
|
|
return f.Unlink(ctx, name)
|
|
}
|