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Merge pull request #3014 from ivandeex/pr-stream-reset

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Fix sporadic stream reset between rclone and restic
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Alexander Neumann 2020-11-05 16:11:50 +01:00 committed by GitHub
commit a5592e83f7
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1 changed files with 26 additions and 1 deletions
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27
internal/backend/rest/rest.go
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@ -173,7 +173,32 @@ func (b *Backend) IsNotExist(err error) bool {
// Load runs fn with a reader that yields the contents of the file at h at the
// given offset.
func (b *Backend) Load(ctx context.Context, h restic.Handle, length int, offset int64, fn func(rd io.Reader) error) error {
return backend.DefaultLoad(ctx, h, length, offset, b.openReader, fn)
r, err := b.openReader(ctx, h, length, offset)
if err != nil {
return err
}
err = fn(r)
if err != nil {
_ = r.Close() // ignore error here
return err
}
// Note: readerat.ReadAt() (the fn) uses io.ReadFull() that doesn't
// wait for EOF after reading body. Due to HTTP/2 stream multiplexing
// and goroutine timings the EOF frame arrives from server (eg. rclone)
// with a delay after reading body. Immediate close might trigger
// HTTP/2 stream reset resulting in the *stream closed* error on server,
// so we wait for EOF before closing body.
var buf [1]byte
_, err = r.Read(buf[:])
if err == io.EOF {
err = nil
}
if e := r.Close(); err == nil {
err = e
}
return err
}
func (b *Backend) openReader(ctx context.Context, h restic.Handle, length int, offset int64) (io.ReadCloser, error) {