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c4b2486b7c
This adds two implementations of the new `FS` interface: One for the local file system (`Local`) and one for a single file read from an `io.Reader` (`Reader`).
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package fs
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import (
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"fmt"
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"os"
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"runtime"
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"runtime/debug"
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)
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// Track is a wrapper around another file system which installs finalizers
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// for open files which call panic() when they are not closed when the garbage
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// collector releases them. This can be used to find resource leaks via open
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// files.
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type Track struct {
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FS
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}
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// Open wraps the Open method of the underlying file system.
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func (fs Track) Open(name string) (File, error) {
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f, err := fs.FS.Open(fixpath(name))
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if err != nil {
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return nil, err
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}
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return newTrackFile(debug.Stack(), name, f), nil
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}
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// OpenFile wraps the OpenFile method of the underlying file system.
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func (fs Track) OpenFile(name string, flag int, perm os.FileMode) (File, error) {
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f, err := fs.FS.OpenFile(fixpath(name), flag, perm)
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if err != nil {
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return nil, err
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}
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return newTrackFile(debug.Stack(), name, f), nil
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}
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type trackFile struct {
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File
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}
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func newTrackFile(stack []byte, filename string, file File) *trackFile {
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f := &trackFile{file}
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runtime.SetFinalizer(f, func(f *trackFile) {
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fmt.Fprintf(os.Stderr, "file %s not closed\n\nStacktrack:\n%s\n", filename, stack)
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panic("file " + filename + " not closed")
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})
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return f
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}
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func (f *trackFile) Close() error {
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runtime.SetFinalizer(f, nil)
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return f.File.Close()
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}
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