Exemplo n.º 1
0
// Get lookup for given key on the table. Get returns errors.ErrNotFound if
// given key did not exist.
func (t *Reader) Get(key []byte, ro opt.ReadOptionsGetter) (rkey, rvalue []byte, err error) {
	// create an iterator of index block
	index_iter := t.indexBlock.NewIterator()
	if !index_iter.Seek(key) {
		err = index_iter.Error()
		if err == nil {
			err = errors.ErrNotFound
		}
		return
	}

	// decode data block info
	bi := new(bInfo)
	_, err = bi.decodeFrom(index_iter.Value())
	if err != nil {
		return
	}

	// get the data block
	if t.filterBlock == nil || t.filterBlock.KeyMayMatch(uint(bi.offset), key) {
		var it iterator.Iterator
		var cache cache.Object
		it, cache, err = t.getDataIter(bi, ro)
		if err != nil {
			return
		}
		if cache != nil {
			defer cache.Release()
		}

		// seek to key
		if !it.Seek(key) {
			err = it.Error()
			if err == nil {
				err = errors.ErrNotFound
			}
			return
		}
		rkey, rvalue = it.Key(), it.Value()
	} else {
		err = errors.ErrNotFound
	}
	return
}
Exemplo n.º 2
0
func TestDb_ClosedIsClosed(t *testing.T) {
	h := newDbHarness(t)
	db := h.db

	var iter, iter2 iterator.Iterator
	var snap *Snapshot
	func() {
		defer h.close()

		h.put("k", "v")
		h.getVal("k", "v")

		iter = db.NewIterator(nil, h.ro)
		iter.Seek([]byte("k"))
		testKeyVal(t, iter, "k->v")

		var err error
		snap, err = db.GetSnapshot()
		if err != nil {
			t.Fatal("GetSnapshot: got error: ", err)
		}

		h.getValr(snap, "k", "v")

		iter2 = snap.NewIterator(nil, h.ro)
		iter2.Seek([]byte("k"))
		testKeyVal(t, iter2, "k->v")

		h.put("foo", "v2")
		h.delete("foo")

		// closing DB
		iter.Release()
		iter2.Release()
	}()

	assertErr(t, db.Put([]byte("x"), []byte("y"), h.wo), true)
	_, err := db.Get([]byte("k"), h.ro)
	assertErr(t, err, true)

	if iter.Valid() {
		t.Errorf("iter.Valid should false")
	}
	assertErr(t, iter.Error(), false)
	testKeyVal(t, iter, "->")
	if iter.Seek([]byte("k")) {
		t.Errorf("iter.Seek should false")
	}
	assertErr(t, iter.Error(), true)

	assertErr(t, iter2.Error(), false)

	_, err = snap.Get([]byte("k"), h.ro)
	assertErr(t, err, true)

	_, err = db.GetSnapshot()
	assertErr(t, err, true)

	iter3 := db.NewIterator(nil, h.ro)
	assertErr(t, iter3.Error(), true)

	iter3 = snap.NewIterator(nil, h.ro)
	assertErr(t, iter3.Error(), true)

	assertErr(t, db.Delete([]byte("k"), h.wo), true)

	_, err = db.GetProperty("leveldb.stats")
	assertErr(t, err, true)

	_, err = db.SizeOf([]util.Range{{[]byte("a"), []byte("z")}})
	assertErr(t, err, true)

	assertErr(t, db.CompactRange(util.Range{}), true)

	assertErr(t, db.Close(), true)
}
Exemplo n.º 3
0
func makeItemIterator(iter iterator.Iterator, prefix []byte) *LevelDbItemIterator {
	iter.Seek(prefix)
	return &LevelDbItemIterator{iter, prefix, nil, nil, nil}
}