package db import ( "fmt" "testing" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" cmn "github.com/tendermint/tmlibs/common" ) func checkValid(t *testing.T, itr Iterator, expected bool) { valid := itr.Valid() require.Equal(t, expected, valid) } func checkNext(t *testing.T, itr Iterator, expected bool) { itr.Next() valid := itr.Valid() require.Equal(t, expected, valid) } func checkNextPanics(t *testing.T, itr Iterator) { assert.Panics(t, func() { itr.Next() }, "checkNextPanics expected panic but didn't") } func checkItem(t *testing.T, itr Iterator, key []byte, value []byte) { k, v := itr.Key(), itr.Value() assert.Exactly(t, key, k) assert.Exactly(t, value, v) } func checkInvalid(t *testing.T, itr Iterator) { checkValid(t, itr, false) checkKeyPanics(t, itr) checkValuePanics(t, itr) checkNextPanics(t, itr) } func checkKeyPanics(t *testing.T, itr Iterator) { assert.Panics(t, func() { itr.Key() }, "checkKeyPanics expected panic but didn't") } func checkValuePanics(t *testing.T, itr Iterator) { assert.Panics(t, func() { itr.Key() }, "checkValuePanics expected panic but didn't") } func newTempDB(t *testing.T, backend DBBackendType) (db DB) { dir, dirname := cmn.Tempdir("test_go_iterator") db = NewDB("testdb", backend, dirname) dir.Close() return db } func TestDBIteratorSingleKey(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) db.SetSync(bz("1"), bz("value_1")) itr := db.Iterator(nil, nil) checkValid(t, itr, true) checkNext(t, itr, false) checkValid(t, itr, false) checkNextPanics(t, itr) // Once invalid... checkInvalid(t, itr) }) } } func TestDBIteratorTwoKeys(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) db.SetSync(bz("1"), bz("value_1")) db.SetSync(bz("2"), bz("value_1")) { // Fail by calling Next too much itr := db.Iterator(nil, nil) checkValid(t, itr, true) checkNext(t, itr, true) checkValid(t, itr, true) checkNext(t, itr, false) checkValid(t, itr, false) checkNextPanics(t, itr) // Once invalid... checkInvalid(t, itr) } }) } } func TestDBIteratorMany(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) keys := make([][]byte, 100) for i := 0; i < 100; i++ { keys[i] = []byte{byte(i)} } value := []byte{5} for _, k := range keys { db.Set(k, value) } itr := db.Iterator(nil, nil) defer itr.Close() for ; itr.Valid(); itr.Next() { assert.Equal(t, db.Get(itr.Key()), itr.Value()) } }) } } func TestDBIteratorEmpty(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) itr := db.Iterator(nil, nil) checkInvalid(t, itr) }) } } func TestDBIteratorEmptyBeginAfter(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) itr := db.Iterator(bz("1"), nil) checkInvalid(t, itr) }) } } func TestDBIteratorNonemptyBeginAfter(t *testing.T) { for backend, _ := range backends { t.Run(fmt.Sprintf("Backend %s", backend), func(t *testing.T) { db := newTempDB(t, backend) db.SetSync(bz("1"), bz("value_1")) itr := db.Iterator(bz("2"), nil) checkInvalid(t, itr) }) } }