fixed proto message

api/gateway/chain/internal/service/gateway/commands/transfer/fee.go

@@ -10,8 +10,10 @@ import (
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/shopspring/decimal"
+	"github.com/tech/sendico/gateway/chain/internal/service/gateway/rpcclient"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/shared"
 	"github.com/tech/sendico/gateway/chain/storage/model"
 	"github.com/tech/sendico/pkg/api/routers/gsresponse"
@@ -85,7 +87,7 @@ func (c *estimateTransferFeeCommand) Execute(ctx context.Context, req *chainv1.E
 		return gsresponse.InvalidArgument[chainv1.EstimateTransferFeeResponse](c.deps.Logger, mservice.ChainGateway, err)
 	}
 
-	feeMoney, err := estimateNetworkFee(ctx, c.deps.Logger, networkCfg, c.deps.RPCTimeout, sourceWallet, destinationAddress, amount)
+	feeMoney, err := estimateNetworkFee(ctx, c.deps.Logger, c.deps.Networks, networkCfg, c.deps.RPCTimeout, sourceWallet, destinationAddress, amount)
 	if err != nil {
 		c.deps.Logger.Warn("fee estimation failed", zap.Error(err))
 		return gsresponse.Auto[chainv1.EstimateTransferFeeResponse](c.deps.Logger, mservice.ChainGateway, err)
@@ -98,11 +100,14 @@ func (c *estimateTransferFeeCommand) Execute(ctx context.Context, req *chainv1.E
 	return gsresponse.Success(resp)
 }
 
-func estimateNetworkFee(ctx context.Context, logger mlogger.Logger, network shared.Network, timeout time.Duration, wallet *model.ManagedWallet, destination string, amount *moneyv1.Money) (*moneyv1.Money, error) {
+func estimateNetworkFee(ctx context.Context, logger mlogger.Logger, registry *rpcclient.Registry, network shared.Network, timeout time.Duration, wallet *model.ManagedWallet, destination string, amount *moneyv1.Money) (*moneyv1.Money, error) {
 	rpcURL := strings.TrimSpace(network.RPCURL)
 	if rpcURL == "" {
 		return nil, merrors.InvalidArgument("network rpc url not configured")
 	}
+	if registry == nil {
+		return nil, merrors.Internal("rpc clients not initialised")
+	}
 	if strings.TrimSpace(wallet.ContractAddress) == "" {
 		return nil, merrors.NotImplemented("native token transfers not supported")
 	}
@@ -116,11 +121,14 @@ func estimateNetworkFee(ctx context.Context, logger mlogger.Logger, network shar
 		return nil, merrors.InvalidArgument("invalid destination address")
 	}
 
-	client, err := ethclient.DialContext(ctx, rpcURL)
+	client, err := registry.Client(network.Name)
 	if err != nil {
-		return nil, merrors.Internal("failed to connect to rpc: " + err.Error())
+		return nil, err
+	}
+	rpcClient, err := registry.RPCClient(network.Name)
+	if err != nil {
+		return nil, err
 	}
-	defer client.Close()
 
 	if timeout <= 0 {
 		timeout = 15 * time.Second
@@ -136,7 +144,7 @@ func estimateNetworkFee(ctx context.Context, logger mlogger.Logger, network shar
 	toAddr := common.HexToAddress(destination)
 	fromAddr := common.HexToAddress(wallet.DepositAddress)
 
-	decimals, err := erc20Decimals(timeoutCtx, client, tokenABI, tokenAddr)
+	decimals, err := erc20Decimals(timeoutCtx, rpcClient, tokenAddr)
 	if err != nil {
 		logger.Warn("failed to read token decimals", zap.Error(err))
 		return nil, err
@@ -182,31 +190,20 @@ func estimateNetworkFee(ctx context.Context, logger mlogger.Logger, network shar
 	}, nil
 }
 
-func erc20Decimals(ctx context.Context, client *ethclient.Client, tokenABI abi.ABI, token common.Address) (uint8, error) {
-	callData, err := tokenABI.Pack("decimals")
-	if err != nil {
-		return 0, merrors.Internal("failed to encode decimals call: " + err.Error())
+func erc20Decimals(ctx context.Context, client *rpc.Client, token common.Address) (uint8, error) {
+	call := map[string]string{
+		"to":   strings.ToLower(token.Hex()),
+		"data": "0x313ce567",
 	}
-	msg := ethereum.CallMsg{
-		To:   &token,
-		Data: callData,
-	}
-	output, err := client.CallContract(ctx, msg, nil)
-	if err != nil {
+	var hexResp string
+	if err := client.CallContext(ctx, &hexResp, "eth_call", call, "latest"); err != nil {
 		return 0, merrors.Internal("decimals call failed: " + err.Error())
 	}
-	values, err := tokenABI.Unpack("decimals", output)
+	val, err := hexutil.DecodeUint64(hexResp)
 	if err != nil {
-		return 0, merrors.Internal("failed to unpack decimals: " + err.Error())
+		return 0, merrors.Internal("decimals decode failed: " + err.Error())
 	}
-	if len(values) == 0 {
-		return 0, merrors.Internal("decimals call returned no data")
-	}
-	decimals, ok := values[0].(uint8)
-	if !ok {
-		return 0, merrors.Internal("decimals call returned unexpected type")
-	}
-	return decimals, nil
+	return uint8(val), nil
 }
 
 func toBaseUnits(amount string, decimals uint8) (*big.Int, error) {

api/gateway/chain/internal/service/gateway/commands/wallet/onchain_balance.go

@@ -7,10 +7,9 @@ import (
 	"strings"
 	"time"
 
-	"github.com/ethereum/go-ethereum"
-	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/shopspring/decimal"
 	"github.com/tech/sendico/gateway/chain/storage/model"
 	"github.com/tech/sendico/pkg/merrors"
@@ -58,7 +57,7 @@ func onChainWalletBalance(ctx context.Context, deps Deps, wallet *model.ManagedW
 
 	logger.Info("Fetching on-chain wallet balance", logFields...)
 
-	client, err := registry.Client(networkKey)
+	rpcClient, err := registry.RPCClient(networkKey)
 	if err != nil {
 		logger.Warn("Failed to fetch rpc client", append(logFields, zap.Error(err))...)
 		return nil, err
@@ -71,23 +70,15 @@ func onChainWalletBalance(ctx context.Context, deps Deps, wallet *model.ManagedW
 	timeoutCtx, cancel := context.WithTimeout(ctx, timeout)
 	defer cancel()
 
-	tokenABI, err := abi.JSON(strings.NewReader(erc20ABIJSON))
-	if err != nil {
-		logger.Warn("Failed to parse erc20 abi", append(logFields, zap.Error(err))...)
-		return nil, merrors.Internal("failed to parse erc20 abi: " + err.Error())
-	}
-	tokenAddr := common.HexToAddress(contract)
-	walletAddr := common.HexToAddress(wallet.DepositAddress)
-
 	logger.Debug("Calling token decimals", logFields...)
-	decimals, err := readDecimals(timeoutCtx, client, tokenABI, tokenAddr)
+	decimals, err := readDecimals(timeoutCtx, rpcClient, contract)
 	if err != nil {
 		logger.Warn("Token decimals call failed", append(logFields, zap.Error(err))...)
 		return nil, err
 	}
 
 	logger.Debug("Calling token balanceOf", append(logFields, zap.Uint8("decimals", decimals))...)
-	bal, err := readBalanceOf(timeoutCtx, client, tokenABI, tokenAddr, walletAddr)
+	bal, err := readBalanceOf(timeoutCtx, rpcClient, contract, wallet.DepositAddress)
 	if err != nil {
 		logger.Warn("Token balanceOf call failed", append(logFields, zap.Uint8("decimals", decimals), zap.Error(err))...)
 		return nil, err
@@ -104,65 +95,40 @@ func onChainWalletBalance(ctx context.Context, deps Deps, wallet *model.ManagedW
 	return &moneyv1.Money{Currency: wallet.TokenSymbol, Amount: dec.String()}, nil
 }
 
-func readDecimals(ctx context.Context, client *ethclient.Client, tokenABI abi.ABI, token common.Address) (uint8, error) {
-	data, err := tokenABI.Pack("decimals")
-	if err != nil {
-		return 0, merrors.Internal("failed to encode decimals call: " + err.Error())
+func readDecimals(ctx context.Context, client *rpc.Client, token string) (uint8, error) {
+	call := map[string]string{
+		"to":   strings.ToLower(common.HexToAddress(token).Hex()),
+		"data": "0x313ce567",
 	}
-	msg := ethereum.CallMsg{To: &token, Data: data}
-	out, err := client.CallContract(ctx, msg, nil)
-	if err != nil {
+	var hexResp string
+	if err := client.CallContext(ctx, &hexResp, "eth_call", call, "latest"); err != nil {
 		return 0, merrors.Internal("decimals call failed: " + err.Error())
 	}
-	values, err := tokenABI.Unpack("decimals", out)
-	if err != nil || len(values) == 0 {
-		return 0, merrors.Internal("failed to unpack decimals")
+	val, err := hexutil.DecodeUint64(hexResp)
+	if err != nil {
+		return 0, merrors.Internal("decimals decode failed: " + err.Error())
 	}
-	if val, ok := values[0].(uint8); ok {
-		return val, nil
-	}
-	return 0, merrors.Internal("decimals returned unexpected type")
+	return uint8(val), nil
 }
 
-func readBalanceOf(ctx context.Context, client *ethclient.Client, tokenABI abi.ABI, token common.Address, wallet common.Address) (*big.Int, error) {
-	data, err := tokenABI.Pack("balanceOf", wallet)
-	if err != nil {
-		return nil, merrors.Internal("failed to encode balanceOf: " + err.Error())
+func readBalanceOf(ctx context.Context, client *rpc.Client, token string, wallet string) (*big.Int, error) {
+	tokenAddr := common.HexToAddress(token)
+	walletAddr := common.HexToAddress(wallet)
+	addr := strings.TrimPrefix(walletAddr.Hex(), "0x")
+	if len(addr) < 64 {
+		addr = strings.Repeat("0", 64-len(addr)) + addr
 	}
-	msg := ethereum.CallMsg{To: &token, Data: data}
-	out, err := client.CallContract(ctx, msg, nil)
-	if err != nil {
+	call := map[string]string{
+		"to":   strings.ToLower(tokenAddr.Hex()),
+		"data": "0x70a08231" + addr,
+	}
+	var hexResp string
+	if err := client.CallContext(ctx, &hexResp, "eth_call", call, "latest"); err != nil {
 		return nil, merrors.Internal("balanceOf call failed: " + err.Error())
 	}
-	values, err := tokenABI.Unpack("balanceOf", out)
-	if err != nil || len(values) == 0 {
-		return nil, merrors.Internal("failed to unpack balanceOf")
+	bigVal, err := hexutil.DecodeBig(hexResp)
+	if err != nil {
+		return nil, merrors.Internal("balanceOf decode failed: " + err.Error())
 	}
-	raw, ok := values[0].(*big.Int)
-	if !ok {
-		return nil, merrors.Internal("balanceOf returned unexpected type")
-	}
-	return decimal.NewFromBigInt(raw, 0).BigInt(), nil
+	return bigVal, nil
 }
-
-const erc20ABIJSON = `
-[
-	{
-		"constant": true,
-		"inputs": [],
-		"name": "decimals",
-		"outputs": [{ "name": "", "type": "uint8" }],
-		"payable": false,
-		"stateMutability": "view",
-        "type": "function"
-	},
-	{
-		"constant": true,
-		"inputs": [{ "name": "_owner", "type": "address" }],
-		"name": "balanceOf",
-		"outputs": [{ "name": "balance", "type": "uint256" }],
-		"payable": false,
-		"stateMutability": "view",
-		"type": "function"
-	}
-]`

api/gateway/chain/internal/service/gateway/executor.go

@@ -10,8 +10,9 @@ import (
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/ethereum/go-ethereum/core/types"
-	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/shopspring/decimal"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/rpcclient"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/shared"
@@ -80,10 +81,14 @@ func (o *onChainExecutor) SubmitTransfer(ctx context.Context, transfer *model.Tr
 	)
 
 	client, err := o.clients.Client(network.Name)
+	if err != nil {
+		o.logger.Warn("failed to initialise rpc client", zap.Error(err), zap.String("network", network.Name))
+		return "", err
+	}
+	rpcClient, err := o.clients.RPCClient(network.Name)
 	if err != nil {
 		o.logger.Warn("failed to initialise rpc client",
 			zap.String("network", network.Name),
-			zap.String("rpc_url", rpcURL),
 			zap.Error(err),
 		)
 		return "", err
@@ -97,10 +102,9 @@ func (o *onChainExecutor) SubmitTransfer(ctx context.Context, transfer *model.Tr
 
 	nonce, err := client.PendingNonceAt(ctx, sourceAddress)
 	if err != nil {
-		o.logger.Warn("failed to fetch nonce",
+		o.logger.Warn("failed to fetch nonce", zap.Error(err),
 			zap.String("transfer_ref", transfer.TransferRef),
 			zap.String("wallet_ref", source.WalletRef),
-			zap.Error(err),
 		)
 		return "", executorInternal("failed to fetch nonce", err)
 	}
@@ -134,12 +138,11 @@ func (o *onChainExecutor) SubmitTransfer(ctx context.Context, transfer *model.Tr
 	}
 	tokenAddress := common.HexToAddress(transfer.ContractAddress)
 
-	decimals, err := erc20Decimals(ctx, client, tokenAddress)
+	decimals, err := erc20Decimals(ctx, rpcClient, tokenAddress)
 	if err != nil {
-		o.logger.Warn("failed to read token decimals",
+		o.logger.Warn("failed to read token decimals", zap.Error(err),
 			zap.String("transfer_ref", transfer.TransferRef),
 			zap.String("contract", transfer.ContractAddress),
-			zap.Error(err),
 		)
 		return "", err
 	}
@@ -151,10 +154,9 @@ func (o *onChainExecutor) SubmitTransfer(ctx context.Context, transfer *model.Tr
 	}
 	amountInt, err := toBaseUnits(amount.Amount, decimals)
 	if err != nil {
-		o.logger.Warn("failed to convert amount to base units",
+		o.logger.Warn("failed to convert amount to base units", zap.Error(err),
 			zap.String("transfer_ref", transfer.TransferRef),
 			zap.String("amount", amount.Amount),
-			zap.Error(err),
 		)
 		return "", err
 	}
@@ -187,18 +189,16 @@ func (o *onChainExecutor) SubmitTransfer(ctx context.Context, transfer *model.Tr
 
 	signedTx, err := o.keyManager.SignTransaction(ctx, source.KeyReference, tx, chainID)
 	if err != nil {
-		o.logger.Warn("failed to sign transaction",
+		o.logger.Warn("failed to sign transaction", zap.Error(err),
 			zap.String("transfer_ref", transfer.TransferRef),
 			zap.String("wallet_ref", source.WalletRef),
-			zap.Error(err),
 		)
 		return "", err
 	}
 
 	if err := client.SendTransaction(ctx, signedTx); err != nil {
-		o.logger.Warn("failed to send transaction",
+		o.logger.Warn("failed to send transaction", zap.Error(err),
 			zap.String("transfer_ref", transfer.TransferRef),
-			zap.Error(err),
 		)
 		return "", executorInternal("failed to send transaction", err)
 	}
@@ -306,31 +306,20 @@ const erc20ABIJSON = `
 	}
 ]`
 
-func erc20Decimals(ctx context.Context, client *ethclient.Client, token common.Address) (uint8, error) {
-	callData, err := erc20ABI.Pack("decimals")
-	if err != nil {
-		return 0, executorInternal("failed to encode decimals call", err)
+func erc20Decimals(ctx context.Context, client *rpc.Client, token common.Address) (uint8, error) {
+	call := map[string]string{
+		"to":   strings.ToLower(token.Hex()),
+		"data": "0x313ce567",
 	}
-	msg := ethereum.CallMsg{
-		To:   &token,
-		Data: callData,
-	}
-	output, err := client.CallContract(ctx, msg, nil)
-	if err != nil {
+	var hexResp string
+	if err := client.CallContext(ctx, &hexResp, "eth_call", call, "latest"); err != nil {
 		return 0, executorInternal("decimals call failed", err)
 	}
-	values, err := erc20ABI.Unpack("decimals", output)
+	val, err := hexutil.DecodeUint64(hexResp)
 	if err != nil {
-		return 0, executorInternal("failed to unpack decimals", err)
+		return 0, executorInternal("decimals decode failed", err)
 	}
-	if len(values) == 0 {
-		return 0, executorInternal("decimals call returned no data", nil)
-	}
-	decimals, ok := values[0].(uint8)
-	if !ok {
-		return 0, executorInternal("decimals call returned unexpected type", nil)
-	}
-	return decimals, nil
+	return uint8(val), nil
 }
 
 func toBaseUnits(amount string, decimals uint8) (*big.Int, error) {

api/gateway/chain/internal/service/gateway/rpcclient/clients.go

@@ -19,7 +19,12 @@ import (
 // Clients holds pre-initialised RPC clients keyed by network name.
 type Clients struct {
 	logger  mlogger.Logger
-	clients map[string]*ethclient.Client
+	clients map[string]clientEntry
+}
+
+type clientEntry struct {
+	eth *ethclient.Client
+	rpc *rpc.Client
 }
 
 // Prepare dials all configured networks up front and returns a ready-to-use client set.
@@ -30,7 +35,7 @@ func Prepare(ctx context.Context, logger mlogger.Logger, networks []shared.Netwo
 	clientLogger := logger.Named("rpc_client")
 	result := &Clients{
 		logger:  clientLogger,
-		clients: make(map[string]*ethclient.Client),
+		clients: make(map[string]clientEntry),
 	}
 
 	for _, network := range networks {
@@ -55,9 +60,10 @@ func Prepare(ctx context.Context, logger mlogger.Logger, networks []shared.Netwo
 		dialCtx, cancel := context.WithTimeout(ctx, 15*time.Second)
 		httpClient := &http.Client{
 			Transport: &loggingRoundTripper{
-				logger:  clientLogger,
-				network: name,
-				base:    http.DefaultTransport,
+				logger:   clientLogger,
+				network:  name,
+				endpoint: rpcURL,
+				base:     http.DefaultTransport,
 			},
 		}
 		rpcCli, err := rpc.DialOptions(dialCtx, rpcURL, rpc.WithHTTPClient(httpClient))
@@ -68,8 +74,10 @@ func Prepare(ctx context.Context, logger mlogger.Logger, networks []shared.Netwo
 			return nil, merrors.Internal(fmt.Sprintf("rpc dial failed for %s: %s", name, err.Error()))
 		}
 		client := ethclient.NewClient(rpcCli)
-
-		result.clients[name] = client
+		result.clients[name] = clientEntry{
+			eth: client,
+			rpc: rpcCli,
+		}
 		clientLogger.Info("rpc client ready", fields...)
 	}
 
@@ -89,11 +97,24 @@ func (c *Clients) Client(network string) (*ethclient.Client, error) {
 		return nil, merrors.Internal("rpc clients not initialised")
 	}
 	name := strings.ToLower(strings.TrimSpace(network))
-	client, ok := c.clients[name]
-	if !ok {
+	entry, ok := c.clients[name]
+	if !ok || entry.eth == nil {
 		return nil, merrors.InvalidArgument(fmt.Sprintf("rpc client not configured for network %s", name))
 	}
-	return client, nil
+	return entry.eth, nil
+}
+
+// RPCClient returns the raw RPC client for low-level calls.
+func (c *Clients) RPCClient(network string) (*rpc.Client, error) {
+	if c == nil {
+		return nil, merrors.Internal("rpc clients not initialised")
+	}
+	name := strings.ToLower(strings.TrimSpace(network))
+	entry, ok := c.clients[name]
+	if !ok || entry.rpc == nil {
+		return nil, merrors.InvalidArgument(fmt.Sprintf("rpc client not configured for network %s", name))
+	}
+	return entry.rpc, nil
 }
 
 // Close tears down all RPC clients, logging each close.
@@ -101,8 +122,12 @@ func (c *Clients) Close() {
 	if c == nil {
 		return
 	}
-	for name, client := range c.clients {
-		client.Close()
+	for name, entry := range c.clients {
+		if entry.rpc != nil {
+			entry.rpc.Close()
+		} else if entry.eth != nil {
+			entry.eth.Close()
+		}
 		if c.logger != nil {
 			c.logger.Info("rpc client closed", zap.String("network", name))
 		}

api/gateway/chain/internal/service/gateway/rpcclient/registry.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/ethereum/go-ethereum/rpc"
 	"github.com/tech/sendico/gateway/chain/internal/service/gateway/shared"
 	"github.com/tech/sendico/pkg/merrors"
 )
@@ -39,6 +40,14 @@ func (r *Registry) Client(key string) (*ethclient.Client, error) {
 	return r.clients.Client(strings.ToLower(strings.TrimSpace(key)))
 }
 
+// RPCClient returns the raw RPC client for low-level calls.
+func (r *Registry) RPCClient(key string) (*rpc.Client, error) {
+	if r == nil || r.clients == nil {
+		return nil, merrors.Internal("rpc clients not initialised")
+	}
+	return r.clients.RPCClient(strings.ToLower(strings.TrimSpace(key)))
+}
+
 // Networks exposes the registry map for iteration when needed.
 func (r *Registry) Networks() map[string]shared.Network {
 	return r.networks