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Reverse iterators (#224)

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with passing tests
This commit is contained in:
Jeremiah Andrews
2018-06-24 19:37:32 -07:00
committed by Jae Kwon
parent fb7ec62b29
commit cb08d28d40
6 changed files with 151 additions and 24 deletions
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64
db/backend_test.go
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@ -149,3 +149,67 @@ func TestGoLevelDBBackend(t *testing.T) {
_, ok := db.(*GoLevelDB)
assert.True(t, ok)
}
func TestDBIterator(t *testing.T) {
for dbType := range backends {
t.Run(fmt.Sprintf("%v", dbType), func(t *testing.T) {
testDBIterator(t, dbType)
})
}
}
func testDBIterator(t *testing.T, backend DBBackendType) {
name := cmn.Fmt("test_%x", cmn.RandStr(12))
db := NewDB(name, backend, "")
defer cleanupDBDir("", name)
for i := 0; i < 10; i++ {
if i != 6 { // but skip 6.
db.Set(int642Bytes(int64(i)), nil)
}
}
verifyIterator(t, db.Iterator(nil, nil), []int64{0, 1, 2, 3, 4, 5, 7, 8, 9}, "forward iterator")
verifyIterator(t, db.ReverseIterator(nil, nil), []int64{9, 8, 7, 5, 4, 3, 2, 1, 0}, "reverse iterator")
verifyIterator(t, db.Iterator(nil, int642Bytes(0)), []int64(nil), "forward iterator to 0")
verifyIterator(t, db.ReverseIterator(nil, int642Bytes(10)), []int64(nil), "reverse iterator 10")
verifyIterator(t, db.Iterator(int642Bytes(0), nil), []int64{0, 1, 2, 3, 4, 5, 7, 8, 9}, "forward iterator from 0")
verifyIterator(t, db.Iterator(int642Bytes(1), nil), []int64{1, 2, 3, 4, 5, 7, 8, 9}, "forward iterator from 1")
verifyIterator(t, db.ReverseIterator(int642Bytes(10), nil), []int64{9, 8, 7, 5, 4, 3, 2, 1, 0}, "reverse iterator from 10")
verifyIterator(t, db.ReverseIterator(int642Bytes(9), nil), []int64{9, 8, 7, 5, 4, 3, 2, 1, 0}, "reverse iterator from 9")
verifyIterator(t, db.ReverseIterator(int642Bytes(8), nil), []int64{8, 7, 5, 4, 3, 2, 1, 0}, "reverse iterator from 8")
verifyIterator(t, db.Iterator(int642Bytes(5), int642Bytes(6)), []int64{5}, "forward iterator from 5 to 6")
verifyIterator(t, db.Iterator(int642Bytes(5), int642Bytes(7)), []int64{5}, "forward iterator from 5 to 7")
verifyIterator(t, db.Iterator(int642Bytes(5), int642Bytes(8)), []int64{5, 7}, "forward iterator from 5 to 8")
verifyIterator(t, db.Iterator(int642Bytes(6), int642Bytes(7)), []int64(nil), "forward iterator from 6 to 7")
verifyIterator(t, db.Iterator(int642Bytes(6), int642Bytes(8)), []int64{7}, "forward iterator from 6 to 8")
verifyIterator(t, db.Iterator(int642Bytes(7), int642Bytes(8)), []int64{7}, "forward iterator from 7 to 8")
verifyIterator(t, db.ReverseIterator(int642Bytes(5), int642Bytes(4)), []int64{5}, "reverse iterator from 5 to 4")
verifyIterator(t, db.ReverseIterator(int642Bytes(6), int642Bytes(4)), []int64{5}, "reverse iterator from 6 to 4")
verifyIterator(t, db.ReverseIterator(int642Bytes(7), int642Bytes(4)), []int64{7, 5}, "reverse iterator from 7 to 4")
verifyIterator(t, db.ReverseIterator(int642Bytes(6), int642Bytes(5)), []int64(nil), "reverse iterator from 6 to 5")
verifyIterator(t, db.ReverseIterator(int642Bytes(7), int642Bytes(5)), []int64{7}, "reverse iterator from 7 to 5")
verifyIterator(t, db.ReverseIterator(int642Bytes(7), int642Bytes(6)), []int64{7}, "reverse iterator from 7 to 6")
verifyIterator(t, db.Iterator(int642Bytes(0), int642Bytes(1)), []int64{0}, "forward iterator from 0 to 1")
verifyIterator(t, db.ReverseIterator(int642Bytes(9), int642Bytes(8)), []int64{9}, "reverse iterator from 9 to 8")
verifyIterator(t, db.Iterator(int642Bytes(2), int642Bytes(4)), []int64{2, 3}, "forward iterator from 2 to 4")
verifyIterator(t, db.Iterator(int642Bytes(4), int642Bytes(2)), []int64(nil), "forward iterator from 4 to 2")
verifyIterator(t, db.ReverseIterator(int642Bytes(4), int642Bytes(2)), []int64{4, 3}, "reverse iterator from 4 to 2")
verifyIterator(t, db.ReverseIterator(int642Bytes(2), int642Bytes(4)), []int64(nil), "reverse iterator from 2 to 4")
}
func verifyIterator(t *testing.T, itr Iterator, expected []int64, msg string) {
var list []int64
for itr.Valid() {
list = append(list, bytes2Int64(itr.Key()))
itr.Next()
}
assert.Equal(t, expected, list, msg)
}