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package db
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
cmn "github.com/tendermint/tendermint/libs/common"
)
func cleanupDBDir(dir, name string) {
os.RemoveAll(filepath.Join(dir, name) + ".db")
}
func testBackendGetSetDelete(t *testing.T, backend DBBackendType) {
// Default
dirname, err := ioutil.TempDir("", fmt.Sprintf("test_backend_%s_", backend))
require.Nil(t, err)
db := NewDB("testdb", backend, dirname)
// A nonexistent key should return nil, even if the key is empty
require.Nil(t, db.Get([]byte("")))
// A nonexistent key should return nil, even if the key is nil
require.Nil(t, db.Get(nil))
// A nonexistent key should return nil.
key := []byte("abc")
require.Nil(t, db.Get(key))
// Set empty value.
db.Set(key, []byte(""))
require.NotNil(t, db.Get(key))
require.Empty(t, db.Get(key))
// Set nil value.
db.Set(key, nil)
require.NotNil(t, db.Get(key))
require.Empty(t, db.Get(key))
// Delete.
db.Delete(key)
require.Nil(t, db.Get(key))
}
func TestBackendsGetSetDelete(t *testing.T) {
for dbType := range backends {
testBackendGetSetDelete(t, dbType)
}
}
func withDB(t *testing.T, creator dbCreator, fn func(DB)) {
name := fmt.Sprintf("test_%x", cmn.RandStr(12))
db, err := creator(name, "")
defer cleanupDBDir("", name)
assert.Nil(t, err)
fn(db)
db.Close()
}
func TestBackendsNilKeys(t *testing.T) {
// Test all backends.
for dbType, creator := range backends {
withDB(t, creator, func(db DB) {
t.Run(fmt.Sprintf("Testing %s", dbType), func(t *testing.T) {
// Nil keys are treated as the empty key for most operations.
expect := func(key, value []byte) {
if len(key) == 0 { // nil or empty
assert.Equal(t, db.Get(nil), db.Get([]byte("")))
assert.Equal(t, db.Has(nil), db.Has([]byte("")))
}
assert.Equal(t, db.Get(key), value)
assert.Equal(t, db.Has(key), value != nil)
}
// Not set
expect(nil, nil)
// Set nil value
db.Set(nil, nil)
expect(nil, []byte(""))
// Set empty value
db.Set(nil, []byte(""))
expect(nil, []byte(""))
// Set nil, Delete nil
db.Set(nil, []byte("abc"))
expect(nil, []byte("abc"))
db.Delete(nil)
expect(nil, nil)
// Set nil, Delete empty
db.Set(nil, []byte("abc"))
expect(nil, []byte("abc"))
db.Delete([]byte(""))
expect(nil, nil)
// Set empty, Delete nil
db.Set([]byte(""), []byte("abc"))
expect(nil, []byte("abc"))
db.Delete(nil)
expect(nil, nil)
// Set empty, Delete empty
db.Set([]byte(""), []byte("abc"))
expect(nil, []byte("abc"))
db.Delete([]byte(""))
expect(nil, nil)
// SetSync nil, DeleteSync nil
db.SetSync(nil, []byte("abc"))
expect(nil, []byte("abc"))
db.DeleteSync(nil)
expect(nil, nil)
// SetSync nil, DeleteSync empty
db.SetSync(nil, []byte("abc"))
expect(nil, []byte("abc"))
db.DeleteSync([]byte(""))
expect(nil, nil)
// SetSync empty, DeleteSync nil
db.SetSync([]byte(""), []byte("abc"))
expect(nil, []byte("abc"))
db.DeleteSync(nil)
expect(nil, nil)
// SetSync empty, DeleteSync empty
db.SetSync([]byte(""), []byte("abc"))
expect(nil, []byte("abc"))
db.DeleteSync([]byte(""))
expect(nil, nil)
})
})
}
}
func TestGoLevelDBBackend(t *testing.T) {
name := fmt.Sprintf("test_%x", cmn.RandStr(12))
db := NewDB(name, GoLevelDBBackend, "")
defer cleanupDBDir("", name)
_, 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 := fmt.Sprintf("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)
}