[#45] balance: Fix inconsistent fee of transfer operations

Signed-off-by: Alex Vanin <a.vanin@yadro.com>

balance/balance_contract.go

@@ -31,6 +31,13 @@ type (
 		// account wasn't burnt.
 		Parent []byte
 	}
+
+	// account is a stored view of Account with fixed int size
+	account struct {
+		Balance []byte
+		Until   []byte
+		Parent  []byte
+	}
 )
 
 const (
@@ -173,7 +180,7 @@ func Lock(txDetails []byte, from, to interop.Hash160, amount, until int) {
 		Parent:  from,
 	}
 
-	common.SetSerialized(ctx, to, lockAccount)
+	setAccount(ctx, to, lockAccount)
 
 	result := token.transfer(ctx, from, to, amount, true, details)
 	if !result {
@@ -310,14 +317,14 @@ func (t Token) transfer(ctx storage.Context, from, to interop.Hash160, amount in
 			storage.Delete(ctx, from)
 		} else {
 			amountFrom.Balance = amountFrom.Balance - amount // neo-go#953
-			common.SetSerialized(ctx, from, amountFrom)
+			setAccount(ctx, from, amountFrom)
 		}
 	}
 
 	if len(to) == 20 {
 		amountTo := getAccount(ctx, to)
 		amountTo.Balance = amountTo.Balance + amount // neo-go#953
-		common.SetSerialized(ctx, to, amountTo)
+		setAccount(ctx, to, amountTo)
 	}
 
 	runtime.Notify("Transfer", from, to, amount)
@@ -371,8 +378,21 @@ func isUsableAddress(addr interop.Hash160) bool {
 func getAccount(ctx storage.Context, key interface{}) Account {
 	data := storage.Get(ctx, key)
 	if data != nil {
-		return std.Deserialize(data.([]byte)).(Account)
+		acc := std.Deserialize(data.([]byte)).(account)
+		return Account{
+			Balance: common.FromFixedWidth64(acc.Balance),
+			Until:   common.FromFixedWidth64(acc.Until),
+			Parent:  acc.Parent,
+		}
 	}
 
 	return Account{}
 }
+
+func setAccount(ctx storage.Context, key interface{}, acc Account) {
+	common.SetSerialized(ctx, key, account{
+		Balance: common.ToFixedWidth64(acc.Balance),
+		Until:   common.ToFixedWidth64(acc.Until),
+		Parent:  acc.Parent,
+	})
+}

tests/container_test.go

@@ -59,24 +59,6 @@ func newContainerInvoker(t *testing.T) (*neotest.ContractInvoker, *neotest.Contr
 	return e.CommitteeInvoker(ctrContainer.Hash), e.CommitteeInvoker(ctrBalance.Hash), e.CommitteeInvoker(ctrNetmap.Hash)
 }
 
-// TODO(alexvanin): remove this after fix of inconsistent tx cost in balance contract
-func newFreeContainerInvoker(t *testing.T) (*neotest.ContractInvoker, *neotest.ContractInvoker, *neotest.ContractInvoker) {
-	e := newExecutor(t)
-
-	ctrNNS := neotest.CompileFile(t, e.CommitteeHash, nnsPath, path.Join(nnsPath, "config.yml"))
-	ctrNetmap := neotest.CompileFile(t, e.CommitteeHash, netmapPath, path.Join(netmapPath, "config.yml"))
-	ctrBalance := neotest.CompileFile(t, e.CommitteeHash, balancePath, path.Join(balancePath, "config.yml"))
-	ctrContainer := neotest.CompileFile(t, e.CommitteeHash, containerPath, path.Join(containerPath, "config.yml"))
-
-	e.DeployContract(t, ctrNNS, nil)
-	deployNetmapContract(t, e, ctrBalance.Hash, ctrContainer.Hash,
-		container.RegistrationFeeKey, int64(0),
-		container.AliasFeeKey, int64(0))
-	deployBalanceContract(t, e, ctrNetmap.Hash, ctrContainer.Hash)
-	deployContainerContract(t, e, ctrNetmap.Hash, ctrBalance.Hash, ctrNNS.Hash)
-	return e.CommitteeInvoker(ctrContainer.Hash), e.CommitteeInvoker(ctrBalance.Hash), e.CommitteeInvoker(ctrNetmap.Hash)
-}
-
 func setContainerOwner(c []byte, acc neotest.Signer) {
 	copy(c[6:], signerToOwner(acc))
 }
@@ -253,10 +235,14 @@ func TestContainerPut(t *testing.T) {
 	})
 
 	t.Run("gas costs are the same for all containers in block", func(t *testing.T) {
-		c, _, _ := newFreeContainerInvoker(t)
-		const containerPerBlock = 512
+		const (
+			containerPerBlock = 512
+			totalContainers   = containerPerBlock + 1
+			totalPrice        = containerFee + containerAliasFee
+		)
 
 		acc := c.NewAccount(t)
+		balanceMint(t, cBal, acc, totalPrice*totalContainers, []byte{})
 		cnt := dummyContainer(acc)
 		putArgs := []interface{}{cnt.value, cnt.sig, cnt.pub, cnt.token, "precreated", ""}
 		c.Invoke(t, stackitem.Null{}, "putNamed", putArgs...)