Exemple #1
0
func (d *DB) recoverJournal() error {
	s := d.s
	icmp := s.cmp

	ff0, err := s.getFiles(storage.TypeJournal)
	if err != nil {
		return err
	}
	ff1 := files(ff0)
	ff1.sort()
	ff2 := make([]storage.File, 0, len(ff1))
	for _, file := range ff1 {
		if file.Num() >= s.stJournalNum || file.Num() == s.stPrevJournalNum {
			s.markFileNum(file.Num())
			ff2 = append(ff2, file)
		}
	}

	var jr *journal.Reader
	var of storage.File
	var mem *memdb.DB
	batch := new(Batch)
	cm := newCMem(s)
	buf := new(util.Buffer)
	// Options.
	strict := s.o.GetStrict(opt.StrictJournal)
	checksum := s.o.GetStrict(opt.StrictJournalChecksum)
	writeBuffer := s.o.GetWriteBuffer()
	recoverJournal := func(file storage.File) error {
		s.logf("journal@recovery recovering @%d", file.Num())
		reader, err := file.Open()
		if err != nil {
			return err
		}
		defer reader.Close()
		if jr == nil {
			jr = journal.NewReader(reader, dropper{s, file}, strict, checksum)
		} else {
			jr.Reset(reader, dropper{s, file}, strict, checksum)
		}
		if of != nil {
			if mem.Len() > 0 {
				if err := cm.flush(mem, 0); err != nil {
					return err
				}
			}
			if err := cm.commit(file.Num(), d.seq); err != nil {
				return err
			}
			cm.reset()
			of.Remove()
			of = nil
		}
		// Reset memdb.
		mem.Reset()
		for {
			r, err := jr.Next()
			if err != nil {
				if err == io.EOF {
					break
				}
				return err
			}
			buf.Reset()
			if _, err := buf.ReadFrom(r); err != nil {
				if strict {
					return err
				}
				continue
			}
			if err := batch.decode(buf.Bytes()); err != nil {
				return err
			}
			if err := batch.memReplay(mem); err != nil {
				return err
			}
			d.seq = batch.seq + uint64(batch.len())
			if mem.Size() >= writeBuffer {
				// Large enough, flush it.
				if err := cm.flush(mem, 0); err != nil {
					return err
				}
				// Reset memdb.
				mem.Reset()
			}
		}
		of = file
		return nil
	}
	// Recover all journals.
	if len(ff2) > 0 {
		s.logf("journal@recovery F·%d", len(ff2))
		mem = memdb.New(icmp, toPercent(writeBuffer, kWriteBufferPercent))
		for _, file := range ff2 {
			if err := recoverJournal(file); err != nil {
				return err
			}
		}
		// Flush the last journal.
		if mem.Len() > 0 {
			if err := cm.flush(mem, 0); err != nil {
				return err
			}
		}
	}
	// Create a new journal.
	if _, err := d.newMem(); err != nil {
		return err
	}
	// Commit.
	if err := cm.commit(d.journalFile.Num(), d.seq); err != nil {
		return err
	}
	// Remove the last journal.
	if of != nil {
		of.Remove()
	}
	return nil
}
func (h *dbCorruptHarness) corrupt(ft storage.FileType, offset, n int) {
	p := &h.dbHarness
	t := p.t

	var file storage.File
	ff, _ := p.stor.GetFiles(ft)
	for _, f := range ff {
		if file == nil || f.Num() > file.Num() {
			file = f
		}
	}
	if file == nil {
		t.Fatalf("no such file with type %q", ft)
	}

	r, err := file.Open()
	if err != nil {
		t.Fatal("cannot open file: ", err)
	}
	x, err := r.Seek(0, 2)
	if err != nil {
		t.Fatal("cannot query file size: ", err)
	}
	m := int(x)
	if _, err := r.Seek(0, 0); err != nil {
		t.Fatal(err)
	}

	if offset < 0 {
		if -offset > m {
			offset = 0
		} else {
			offset = m + offset
		}
	}
	if offset > m {
		offset = m
	}
	if offset+n > m {
		n = m - offset
	}

	buf := make([]byte, m)
	_, err = io.ReadFull(r, buf)
	if err != nil {
		t.Fatal("cannot read file: ", err)
	}
	r.Close()

	for i := 0; i < n; i++ {
		buf[offset+i] ^= 0x80
	}

	err = file.Remove()
	if err != nil {
		t.Fatal("cannot remove old file: ", err)
	}
	w, err := file.Create()
	if err != nil {
		t.Fatal("cannot create new file: ", err)
	}
	_, err = w.Write(buf)
	if err != nil {
		t.Fatal("cannot write new file: ", err)
	}
	w.Close()
}