Merge pull request #792 from albertchon/b/close-iterators

fix: close iterators

x/wasm/keeper/genesis.go

@@ -119,6 +119,8 @@ func ExportGenesis(ctx sdk.Context, keeper *Keeper) *types.GenesisState {
 			ContractState:   state,
 		})
 
+		contractStateIterator.Close()
+
 		return false
 	})
 

x/wasm/keeper/genesis_test.go

@@ -113,14 +113,17 @@ func TestGenesisExportImport(t *testing.T) {
 	wasmKeeper.IterateContractInfo(srcCtx, func(address sdk.AccAddress, info wasmTypes.ContractInfo) bool {
 		wasmKeeper.removeFromContractCodeSecondaryIndex(srcCtx, address, wasmKeeper.getLastContractHistoryEntry(srcCtx, address))
 		prefixStore := prefix.NewStore(srcCtx.KVStore(wasmKeeper.storeKey), types.GetContractCodeHistoryElementPrefix(address))
-		for iter := prefixStore.Iterator(nil, nil); iter.Valid(); iter.Next() {
+		iter := prefixStore.Iterator(nil, nil)
+
+		for ; iter.Valid(); iter.Next() {
 			prefixStore.Delete(iter.Key())
 		}
 		x := &info
 		newHistory := x.ResetFromGenesis(dstCtx)
 		wasmKeeper.storeContractInfo(srcCtx, address, x)
 		wasmKeeper.addToContractCodeSecondaryIndex(srcCtx, address, newHistory)
 		wasmKeeper.appendToContractHistory(srcCtx, address, newHistory)
+		iter.Close()
 		return false
 	})
 
@@ -145,6 +148,8 @@ func TestGenesisExportImport(t *testing.T) {
 		if !assert.False(t, dstIT.Valid()) {
 			t.Fatalf("dest Iterator still has key :%X", dstIT.Key())
 		}
+		srcIT.Close()
+		dstIT.Close()
 	}
 }
 

x/wasm/keeper/keeper.go

@@ -524,7 +524,10 @@ func (k Keeper) removeFromContractCodeSecondaryIndex(ctx sdk.Context, contractAd
 // IterateContractsByCode iterates over all contracts with given codeID ASC on code update time.
 func (k Keeper) IterateContractsByCode(ctx sdk.Context, codeID uint64, cb func(address sdk.AccAddress) bool) {
 	prefixStore := prefix.NewStore(ctx.KVStore(k.storeKey), types.GetContractByCodeIDSecondaryIndexPrefix(codeID))
-	for iter := prefixStore.Iterator(nil, nil); iter.Valid(); iter.Next() {
+	iter := prefixStore.Iterator(nil, nil)
+	defer iter.Close()
+
+	for ; iter.Valid(); iter.Next() {
 		key := iter.Key()
 		if cb(key[types.AbsoluteTxPositionLen:]) {
 			return
@@ -550,7 +553,10 @@ func (k Keeper) appendToContractHistory(ctx sdk.Context, contractAddr sdk.AccAdd
 	// find last element position
 	var pos uint64
 	prefixStore := prefix.NewStore(store, types.GetContractCodeHistoryElementPrefix(contractAddr))
-	if iter := prefixStore.ReverseIterator(nil, nil); iter.Valid() {
+	iter := prefixStore.ReverseIterator(nil, nil)
+	defer iter.Close()
+
+	if iter.Valid() {
 		pos = sdk.BigEndianToUint64(iter.Value())
 	}
 	// then store with incrementing position
@@ -565,6 +571,8 @@ func (k Keeper) GetContractHistory(ctx sdk.Context, contractAddr sdk.AccAddress)
 	prefixStore := prefix.NewStore(ctx.KVStore(k.storeKey), types.GetContractCodeHistoryElementPrefix(contractAddr))
 	r := make([]types.ContractCodeHistoryEntry, 0)
 	iter := prefixStore.Iterator(nil, nil)
+	defer iter.Close()
+
 	for ; iter.Valid(); iter.Next() {
 		var e types.ContractCodeHistoryEntry
 		k.cdc.MustUnmarshal(iter.Value(), &e)
@@ -577,6 +585,8 @@ func (k Keeper) GetContractHistory(ctx sdk.Context, contractAddr sdk.AccAddress)
 func (k Keeper) getLastContractHistoryEntry(ctx sdk.Context, contractAddr sdk.AccAddress) types.ContractCodeHistoryEntry {
 	prefixStore := prefix.NewStore(ctx.KVStore(k.storeKey), types.GetContractCodeHistoryElementPrefix(contractAddr))
 	iter := prefixStore.ReverseIterator(nil, nil)
+	defer iter.Close()
+
 	var r types.ContractCodeHistoryEntry
 	if !iter.Valid() {
 		// all contracts have a history
@@ -666,6 +676,8 @@ func (k Keeper) storeContractInfo(ctx sdk.Context, contractAddress sdk.AccAddres
 func (k Keeper) IterateContractInfo(ctx sdk.Context, cb func(sdk.AccAddress, types.ContractInfo) bool) {
 	prefixStore := prefix.NewStore(ctx.KVStore(k.storeKey), types.ContractKeyPrefix)
 	iter := prefixStore.Iterator(nil, nil)
+	defer iter.Close()
+
 	for ; iter.Valid(); iter.Next() {
 		var contract types.ContractInfo
 		k.cdc.MustUnmarshal(iter.Value(), &contract)
@@ -716,6 +728,8 @@ func (k Keeper) containsCodeInfo(ctx sdk.Context, codeID uint64) bool {
 func (k Keeper) IterateCodeInfos(ctx sdk.Context, cb func(uint64, types.CodeInfo) bool) {
 	prefixStore := prefix.NewStore(ctx.KVStore(k.storeKey), types.CodeKeyPrefix)
 	iter := prefixStore.Iterator(nil, nil)
+	defer iter.Close()
+
 	for ; iter.Valid(); iter.Next() {
 		var c types.CodeInfo
 		k.cdc.MustUnmarshal(iter.Value(), &c)
@@ -788,6 +802,8 @@ func (k Keeper) IsPinnedCode(ctx sdk.Context, codeID uint64) bool {
 func (k Keeper) InitializePinnedCodes(ctx sdk.Context) error {
 	store := prefix.NewStore(ctx.KVStore(k.storeKey), types.PinnedCodeIndexPrefix)
 	iter := store.Iterator(nil, nil)
+	defer iter.Close()
+
 	for ; iter.Valid(); iter.Next() {
 		codeInfo := k.GetCodeInfo(ctx, types.ParsePinnedCodeIndex(iter.Key()))
 		if codeInfo == nil {

x/wasm/keeper/legacy_querier.go

@@ -93,7 +93,10 @@ func queryContractState(ctx sdk.Context, bech, queryMethod string, data []byte,
 	case QueryMethodContractStateAll:
 		resultData := make([]types.Model, 0)
 		// this returns a serialized json object (which internally encoded binary fields properly)
-		for iter := keeper.GetContractState(ctx, contractAddr); iter.Valid(); iter.Next() {
+		iter := keeper.GetContractState(ctx, contractAddr)
+		defer iter.Close()
+
+		for ; iter.Valid(); iter.Next() {
 			resultData = append(resultData, types.Model{
 				Key:   iter.Key(),
 				Value: iter.Value(),

x/wasm/types/iavl_range_test.go

@@ -63,6 +63,7 @@ func TestIavlRangeBounds(t *testing.T) {
 			}
 			items := consume(iter)
 			require.Equal(t, tc.expected, items)
+			iter.Close()
 		})
 	}
 }
@@ -73,8 +74,6 @@ type KV struct {
 }
 
 func consume(itr store.Iterator) []KV {
-	defer itr.Close()
-
 	var res []KV
 	for ; itr.Valid(); itr.Next() {
 		k, v := itr.Key(), itr.Value()