[#16] ir: Use mint and burn methods in balance contract

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/innerring/invoke/balance.go

@@ -22,11 +22,20 @@ type (
 		Amount      int64  // in Fixed16
 		Until       uint64 // epochs
 	}
+
+	// MintBurnParams for Mint and Burn invocations.
+	MintBurnParams struct {
+		ScriptHash []byte
+		Amount     int64 // in Fixed16
+		Comment    []byte
+	}
 )
 
 const (
 	transferXMethod = "transferX"
 	lockMethod      = "lock"
+	mintMethod      = "mint"
+	burnMethod      = "burn"
 )
 
 // TransferBalanceX invokes transferX method.
@@ -43,6 +52,32 @@ func TransferBalanceX(cli *client.Client, con util.Uint160, p *TransferXParams)
 	)
 }
 
+// Mint assets in contract.
+func Mint(cli *client.Client, con util.Uint160, p *MintBurnParams) error {
+	if cli == nil {
+		return client.ErrNilClient
+	}
+
+	return cli.Invoke(con, extraFee, mintMethod,
+		p.ScriptHash,
+		p.Amount,
+		p.Comment,
+	)
+}
+
+// Burn minted assets.
+func Burn(cli *client.Client, con util.Uint160, p *MintBurnParams) error {
+	if cli == nil {
+		return client.ErrNilClient
+	}
+
+	return cli.Invoke(con, extraFee, burnMethod,
+		p.ScriptHash,
+		p.Amount,
+		p.Comment,
+	)
+}
+
 // LockAsset invokes Lock method.
 func LockAsset(cli *client.Client, con util.Uint160, p *LockParams) error {
 	if cli == nil {

pkg/innerring/processors/neofs/process_assets.go

@@ -15,11 +15,6 @@ const (
 	lockAccountLifetime uint64 = 20
 )
 
-var (
-	// fedReserveAddr is a special account in balance contract.
-	fedReserveAddr = []byte{0x0F, 0xED}
-)
-
 // Process deposit event by invoking balance contract and sending native
 // gas in morph chain.
 func (np *Processor) processDeposit(deposit *neofsEvent.Deposit) {
@@ -29,10 +24,9 @@ func (np *Processor) processDeposit(deposit *neofsEvent.Deposit) {
 	}
 
 	// send transferX to balance contract
-	err := invoke.TransferBalanceX(np.morphClient, np.balanceContract,
-		&invoke.TransferXParams{
-			Sender:   fedReserveAddr,
-			Receiver: deposit.To().BytesBE(),
+	err := invoke.Mint(np.morphClient, np.balanceContract,
+		&invoke.MintBurnParams{
+			ScriptHash: deposit.To().BytesBE(),
 			Amount:     deposit.Amount() * 1_0000_0000, // from Fixed8 to Fixed16
 			Comment:    append([]byte(txLogPrefix), deposit.ID()...),
 		})
@@ -91,10 +85,9 @@ func (np *Processor) processCheque(cheque *neofsEvent.Cheque) {
 		return
 	}
 
-	err := invoke.TransferBalanceX(np.morphClient, np.balanceContract,
-		&invoke.TransferXParams{
-			Sender:   cheque.LockAccount().BytesBE(),
-			Receiver: fedReserveAddr,
+	err := invoke.Burn(np.morphClient, np.balanceContract,
+		&invoke.MintBurnParams{
+			ScriptHash: cheque.LockAccount().BytesBE(),
 			Amount:     cheque.Amount() * 1_0000_0000, // from Fixed8 to Fixed16
 			Comment:    append([]byte(txLogPrefix), cheque.ID()...),
 		})