// 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
}
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)
}
func makeItemIterator(iter iterator.Iterator, prefix []byte) *LevelDbItemIterator {
iter.Seek(prefix)
return &LevelDbItemIterator{iter, prefix, nil, nil, nil}
}