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The actual implementation still relies on file paths, but with the abstraction layer in place, an FS implementation can ensure atomic file accesses in the future.
45 lines
1.0 KiB
Go
45 lines
1.0 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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// OpenFile wraps the OpenFile method of the underlying file system.
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func (fs Track) OpenFile(name string, flag int, metadataOnly bool) (File, error) {
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f, err := fs.FS.OpenFile(name, flag, metadataOnly)
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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(_ any) {
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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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