add function EscrowAccountHasBalance (#1042)

* add function EscrowAccountHasBalance

* change API to use sdk.Coins

modules/apps/29-fee/keeper/keeper.go

@@ -76,6 +76,17 @@ func (k Keeper) GetFeeModuleAddress() sdk.AccAddress {
 	return k.authKeeper.GetModuleAddress(types.ModuleName)
 }
 
+// EscrowAccountHasBalance verifies if the escrow account has the provided fee.
+func (k Keeper) EscrowAccountHasBalance(ctx sdk.Context, coins sdk.Coins) bool {
+	for _, coin := range coins {
+		if !k.bankKeeper.HasBalance(ctx, k.GetFeeModuleAddress(), coin) {
+			return false
+		}
+	}
+
+	return true
+}
+
 // SetFeeEnabled sets a flag to determine if fee handling logic should run for the given channel
 // identified by channel and port identifiers.
 func (k Keeper) SetFeeEnabled(ctx sdk.Context, portID, channelID string) {

modules/apps/29-fee/keeper/keeper_test.go

@@ -67,6 +67,27 @@ func TestKeeperTestSuite(t *testing.T) {
 	suite.Run(t, new(KeeperTestSuite))
 }
 
+func (suite *KeeperTestSuite) TestEscrowAccountHasBalance() {
+	fee := types.Fee{
+		AckFee:     defaultAckFee,
+		RecvFee:    defaultReceiveFee,
+		TimeoutFee: defaultTimeoutFee,
+	}
+
+	suite.Require().False(suite.chainA.GetSimApp().IBCFeeKeeper.EscrowAccountHasBalance(suite.chainA.GetContext(), fee.Total()))
+
+	// set fee in escrow account
+	err := suite.chainA.GetSimApp().BankKeeper.SendCoinsFromAccountToModule(suite.chainA.GetContext(), suite.chainA.SenderAccount.GetAddress(), types.ModuleName, fee.Total())
+	suite.Require().Nil(err)
+
+	suite.Require().True(suite.chainA.GetSimApp().IBCFeeKeeper.EscrowAccountHasBalance(suite.chainA.GetContext(), fee.Total()))
+
+	// increase ack fee
+	fee.AckFee = fee.AckFee.Add(defaultAckFee...)
+	suite.Require().False(suite.chainA.GetSimApp().IBCFeeKeeper.EscrowAccountHasBalance(suite.chainA.GetContext(), fee.Total()))
+
+}
+
 func (suite *KeeperTestSuite) TestFeesInEscrow() {
 	suite.coordinator.Setup(suite.path)