2. Dropped channel in sensorFileReadHandle

Designed by Arsen6331

fuse.go

@@ -11,7 +11,15 @@ import (
 
 func startFUSE(ctx context.Context, dev *infinitime.Device) error {
 	// This is where we'll mount the FS
-	os.Mkdir(k.String("fuse.mountpoint"), 0755)
+	err := os.MkdirAll(k.String("fuse.mountpoint"), 0755)
+	if err != nil && !os.IsExist(err) {
+		return err
+	}
+
+	// Ignore the error because nothing might be mounted on the mountpoint
+	_ = fusefs.Unmount(k.String("fuse.mountpoint"))
+
+
 	root, err := fusefs.BuildRootNode(dev)
 	if err != nil {
 		log.Error("Building root node failed").

internal/fusefs/converters.go

@@ -1,61 +0,0 @@
-package fusefs
-
-import (
-	"go.arsenm.dev/infinitime"
-	"context"
-	"strconv"
-)
-
-func converterU8(ctx context.Context, in <-chan uint8) <-chan []byte {
-	out := make(chan []byte, 2)
-	go func() {
-		for {
-			select {
-			case <- ctx.Done():
-				return
-			case event := <-in:
-				out <- []byte(strconv.Itoa(int(event)) + "\n")
-			}
-		}
-	}()
-	return out
-}
-
-func converterU32(ctx context.Context, in <-chan uint32) <-chan []byte {
-	out := make(chan []byte, 2)
-	go func() {
-		for {
-			select {
-			case <- ctx.Done():
-				return
-			case event := <-in:
-				out <- []byte(strconv.Itoa(int(event)) + "\n")
-			}
-		}
-	}()
-	return out
-}
-
-func converterMotionValues(ctx context.Context, in <-chan infinitime.MotionValues) <-chan []byte {
-	out := make(chan []byte, 2)
-	go func() {
-		for {
-			select {
-			case <- ctx.Done():
-				return
-			case event := <-in:
-				out <- []byte(strconv.Itoa(int(event.X)) + " " + strconv.Itoa(int(event.Y)) + " " + strconv.Itoa(int(event.Z)) + "\n")
-			}
-		}
-	}()
-	return out
-}
-
-func converter1String(ctx context.Context, in string) <-chan []byte {
-	out := make(chan []byte, 2)
-	out <- []byte(in + "\n")
-	close(out)
-	return out
-}
-
-

internal/fusefs/fuse.go

@@ -10,12 +10,13 @@ import (
 	"github.com/hanwen/go-fuse/v2/fuse"
 	"io"
 	"bytes"
+	"strconv"
 )
 
 type ITProperty struct {
 	name string
 	Ino uint64
-	gen func(context.Context) (<-chan []byte, error)
+	gen func() ([]byte, error)
 }
 
 
@@ -55,34 +56,34 @@ var properties = make([]ITProperty, 6)
 
 func BuildProperties(dev *infinitime.Device) {
 	properties[0] = ITProperty{"heartrate", 2,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
-			ans, err := dev.WatchHeartRate(ctx)
+			ans, err := dev.HeartRate()
-			return converterU8(ctx, ans), err
+			return []byte(strconv.Itoa(int(ans)) + "\n"), err
 	}}
 	properties[1] = ITProperty{"battery", 3,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
-			ans, err := dev.WatchBatteryLevel(ctx)
+			ans, err := dev.BatteryLevel()
-			return converterU8(ctx, ans), err
+			return []byte(strconv.Itoa(int(ans)) + "\n"), err
 	}}
 	properties[2] = ITProperty{"motion", 4,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
-			ans, err := dev.WatchMotion(ctx)
+			ans, err := dev.Motion()
-			return converterMotionValues(ctx, ans), err
+			return []byte(strconv.Itoa(int(ans.X)) + " " + strconv.Itoa(int(ans.Y)) + " " + strconv.Itoa(int(ans.Z)) + "\n"), err
 	}}
-	properties[3] = ITProperty{"stepcount", 5,
+	properties[3] = ITProperty{"stepcount", 6,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
-			ans, err := dev.WatchStepCount(ctx)
+			ans, err := dev.StepCount()
-			return converterU32(ctx, ans), err
+			return []byte(strconv.Itoa(int(ans)) + "\n"), err
 	}}
-	properties[4] = ITProperty{"version", 6,
+	properties[4] = ITProperty{"version", 7,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
 			ans, err := dev.Version()
-			return converter1String(ctx, ans), err
+			return []byte(ans + "\n"), err
 	}}
-	properties[5] = ITProperty{"address", 7,
+	properties[5] = ITProperty{"address", 8,
-		func(ctx context.Context) (<-chan []byte, error) {
+		func() ([]byte, error) {
 			ans := dev.Address()
-			return converter1String(ctx, ans), nil
+			return []byte(ans + "\n"), nil
 	}}
 
 }
@@ -97,7 +98,7 @@ func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
 		// root folder
 		r := make([]fuse.DirEntry, 2)
 		r[0] = fuse.DirEntry{
-			Name: "device",
+			Name: "info",
 			Ino:  0,
 			Mode: fuse.S_IFDIR,
 		}
@@ -109,7 +110,7 @@ func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
 		return fs.NewListDirStream(r), 0
 
 	case 1:
-		// device folder
+		// info folder
 		r := make([]fuse.DirEntry, 6)
 		for ind, value := range properties {
 			r[ind] = fuse.DirEntry{
@@ -122,7 +123,7 @@ func (n *ITNode) Readdir(ctx context.Context) (fs.DirStream, syscall.Errno) {
 		return fs.NewListDirStream(r), 0
 
 	case 2:
-		// on device
+		// on info
 		files, err := myfs.ReadDir(n.path)
 		if err != nil {
 			log.Error("FUSE ReadDir failed").Str("path", n.path).Err(err).Send()
@@ -179,7 +180,7 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
 	switch n.kind {
 	case 0:
 		// root folder
-		if name == "device" {
+		if name == "info" {
 			stable := fs.StableAttr{
 				Mode: fuse.S_IFDIR,
 				Ino: uint64(0),
@@ -197,7 +198,7 @@ func (n *ITNode) Lookup(ctx context.Context, name string, out *fuse.EntryOut) (*
 			return child, 0
 		}
 	case 1:
-		// device folder
+		// info folder
 		for _, value := range properties {
 			if value.name == name {
 				stable := fs.StableAttr{
@@ -264,18 +265,20 @@ func (fh *bytesFileReadHandle) Read(ctx context.Context, dest []byte, off int64)
 }
 
 type sensorFileReadHandle struct {
-	ch <-chan []byte
+	content []byte
-	cancel context.CancelFunc
 }
 var _ fs.FileReader = (*sensorFileReadHandle)(nil)
 func (fh *sensorFileReadHandle) Read(ctx context.Context, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
-	content := <-fh.ch
+	log.Info("Executing Read").Int("size", len(fh.content)).Send()
-	return fuse.ReadResultData(content), 0
+	end := off + int64(len(dest))
+	if end > int64(len(fh.content)) {
+		end = int64(len(fh.content))
+	}
+	return fuse.ReadResultData(fh.content[off:end]), 0
 }
 
 var _ fs.FileFlusher = (*sensorFileReadHandle)(nil)
 func (fh *sensorFileReadHandle) Flush(ctx context.Context) (errno syscall.Errno) {
-	fh.cancel()
 	return 0
 }
 
@@ -427,15 +430,13 @@ func (f *ITNode) Open(ctx context.Context, openFlags uint32) (fh fs.FileHandle,
 
 		for _, value := range properties {
 			if value.Ino == f.Ino {
-				sub_ctx, cancel := context.WithCancel(ctx)
+				ans, err := value.gen()
-				ans, err := value.gen(sub_ctx)
 				if err != nil {
 					return nil, 0, syscallErr(err)
 				}
 
 				fh = &sensorFileReadHandle{
-					ch: ans,
+					content : ans,
-					cancel : cancel,
 				}
 				return fh, fuse.FOPEN_DIRECT_IO, 0
 			}

internal/fusefs/unmount.go

@@ -0,0 +1,15 @@
+package fusefs
+
+import (
+	_ "unsafe"
+	"github.com/hanwen/go-fuse/v2/fuse"
+)
+
+func Unmount(mountPoint string) error {
+	return unmount(mountPoint, &fuse.MountOptions{DirectMount: false})
+}
+
+// Unfortunately, the FUSE library does not export its unmount function,
+// so this is required until that changes
+//go:linkname unmount github.com/hanwen/go-fuse/v2/fuse.unmount
+func unmount(mountPoint string, opts *fuse.MountOptions) error