Beispiel #1
0
func (t *traverser) readFile(sq *seq.Sequencer, fid *g9pc.NsFile, path string) {
	t.printf("readFile %s", path)
	sq, results := sq.Subsequencer("readFile")
	go func() {
		_, ok := <-results // open
		if !ok {
			t.printf("cannot open %s: %v", path, sq.Error())
			return
		}
		<-results // stream
		_, ok = <-results
		if ok {
			panic("expected closed")
		}
		sq.Result(seq.StringResult("readFile"), sq.Error())
	}()
	sq.Do(fid.File(), seq.OpenReq{g9p.OREAD})
	rd := fid.SeqReadStream(sq, 20, 8192)
	tot, _ := io.Copy(nullWriter{}, rd)
	t.printf("%10d %s", tot, path)
	sq.Do(nil, nil)
}
Beispiel #2
0
func (t *traverser) readDir(pseq *seq.Sequencer, fid *g9pc.NsFile, path string) {
	t.printf("readDir %s", path)
	sq, results := pseq.Subsequencer("readDir")
	errc := make(chan error, 1)
	go func() {
		<-results          // SeqWalk (clone)
		_, ok := <-results // OpenReq
		if !ok {
			errc <- fmt.Errorf("cannot open %q: %#v", path, sq.Error())
			return
		}
		<-results // NonseqReq
		<-results // ReadStream
		errc <- nil
		_, ok = <-results // eof
		if ok {
			panic("expected closed")
		}
		errc <- nil
	}()

	rfid := fid.SeqWalk(sq)
	//	defer rfid.Close()		TODO something better!

	sq.Do(rfid.File(), seq.OpenReq{g9p.OREAD})
	sq.Do(fid.File(), seq.NonseqReq{})
	rd := rfid.SeqReadStream(sq, 5, 8192)
	defer rd.Close()

	buf, _ := ioutil.ReadAll(rd)
	t.printf("read %d bytes from %q", len(buf), path)
	err := <-errc
	sq.Do(nil, nil)
	<-errc
	//we get here but fid still can be part of the sequence.
	//maybe that means that subsequence has not terminated
	//correctly. no it doesn't. it means that the overall sequence
	//has not terminated correctly.
	//
	//question: should files opened as part of a subsequence be
	//ratified by the subsequence finishing?
	//only

	if err != nil && len(buf) == 0 {
		sq.Result(nil, err)
		t.printf("error on %s: %v\n", path, err)
		return
	}

	d, err := g9p.UnmarshalDirs(buf)
	if err != nil {
		t.printf("cannot unpack directory %s: %v\n", path, err)
		return
	}

	sync := make(chan bool)
	for i, dir := range d {
		t.printf("%q[%d]: %v", path, i, dir)
		go t.traverse(fid, path, dir.Name, sync)
	}
	for i := 0; i < len(d); i++ {
		<-sync
	}
	t.printf("%s: %d entries", path, len(d))
	sq.Result(seq.StringResult("readDir"), nil)
}