refactor

pkg/ctxbilly/fs.go

@@ -5,7 +5,7 @@ import (
 	"io"
 	"os"
 
-	"git.kmsign.ru/royalcat/tstor/pkg/ctxio"
+	"github.com/royalcat/ctxio"
 )
 
 type Filesystem interface {
@@ -36,16 +36,6 @@ type Filesystem interface {
 	// UNC path if and only if the first path element is a UNC path.
 	Join(elem ...string) string
 
-	// TempFile creates a new temporary file in the directory dir with a name
-	// beginning with prefix, opens the file for reading and writing, and
-	// returns the resulting *os.File. If dir is the empty string, TempFile
-	// uses the default directory for temporary files (see os.TempDir).
-	// Multiple programs calling TempFile simultaneously will not choose the
-	// same file. The caller can use f.Name() to find the pathname of the file.
-	// It is the caller's responsibility to remove the file when no longer
-	// needed.
-	TempFile(ctx context.Context, dir, prefix string) (File, error)
-
 	// ReadDir reads the directory named by d(irname and returns a list of
 	// directory entries sorted by filename.
 	ReadDir(ctx context.Context, path string) ([]os.FileInfo, error)
@@ -74,19 +64,38 @@ type Filesystem interface {
 	// Root() string
 }
 
+type TempFileFS interface {
+	// TempFile creates a new temporary file in the directory dir with a name
+	// beginning with prefix, opens the file for reading and writing, and
+	// returns the resulting *os.File. If dir is the empty string, TempFile
+	// uses the default directory for temporary files (see os.TempDir).
+	// Multiple programs calling TempFile simultaneously will not choose the
+	// same file. The caller can use f.Name() to find the pathname of the file.
+	// It is the caller's responsibility to remove the file when no longer
+	// needed.
+	TempFile(ctx context.Context, dir, prefix string) (File, error)
+}
+
 type File interface {
 	// Name returns the name of the file as presented to Open.
 	Name() string
 	ctxio.Writer
+	ctxio.WriterAt
 	ctxio.Reader
 	ctxio.ReaderAt
 	io.Seeker
 	ctxio.Closer
+}
+
+type LockFile interface {
 	// Lock locks the file like e.g. flock. It protects against access from
 	// other processes.
 	Lock() error
 	// Unlock unlocks the file.
 	Unlock() error
+}
+
+type TruncateFile interface {
 	// Truncate the file.
 	Truncate(ctx context.Context, size int64) error
 }