add basic file logging in the gateway

tools/walletextension/common/common.go

@@ -4,6 +4,7 @@ import (
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
+	"os"
 
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/crypto/ecies"
@@ -78,3 +79,20 @@ func (r *RPCRequest) Clone() *RPCRequest {
 		Params: r.Params,
 	}
 }
+
+// NewFileLogger is a logger factory function
+func NewFileLogger() gethlog.Logger {
+	// Open or create your log file
+	file, err := os.OpenFile("gateway_logs.log", os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		panic(err)
+	}
+
+	// Create a new logger instance
+	logger := gethlog.New()
+
+	// Set the handler to the file
+	logger.SetHandler(gethlog.StreamHandler(file, gethlog.TerminalFormat(false)))
+
+	return logger
+}

tools/walletextension/wallet_extension.go

@@ -37,6 +37,7 @@ type WalletExtension struct {
 	unsignedVKs        map[gethcommon.Address]*viewingkey.ViewingKey // Map temporarily holding VKs that have been generated but not yet signed
 	storage            storage.Storage
 	logger             gethlog.Logger
+	fileLogger         gethlog.Logger
 	stopControl        *stopcontrol.StopControl
 	version            string
 	config             *config.Config
@@ -59,13 +60,15 @@ func New(
 		panic(err)
 	}
 	newTenClient := obsclient.NewObsClient(rpcClient)
+	newFileLogger := common.NewFileLogger()
 	return &WalletExtension{
 		hostAddrHTTP:       hostAddrHTTP,
 		hostAddrWS:         hostAddrWS,
 		userAccountManager: userAccountManager,
 		unsignedVKs:        map[gethcommon.Address]*viewingkey.ViewingKey{},
 		storage:            storage,
 		logger:             logger,
+		fileLogger:         newFileLogger,
 		stopControl:        stopControl,
 		version:            version,
 		config:             config,
@@ -92,11 +95,13 @@ func (w *WalletExtension) ProxyEthRequest(request *common.RPCRequest, conn userc
 
 	// proxyRequest will find the correct client to proxy the request (or try them all if appropriate)
 	var rpcResp interface{}
+	w.fileLogger.Info(fmt.Sprintf("Request method: %s, request params: %s, encryptionToken of sender: %s", request.Method, request.Params, hexUserID))
 
 	// wallet extension can override the GetStorageAt to retrieve the current userID
 	if request.Method == rpc.GetStorageAt {
 		if interceptedResponse := w.getStorageAtInterceptor(request, hexUserID); interceptedResponse != nil {
 			w.logger.Info("interception successful for getStorageAt, returning userID response")
+			w.fileLogger.Info(fmt.Sprintf("Request method: %s, request params: %s, encryptionToken of sender: %s, response: %s", request.Method, request.Params, hexUserID, interceptedResponse))
 			return interceptedResponse, nil
 		}
 	}
@@ -113,6 +118,7 @@ func (w *WalletExtension) ProxyEthRequest(request *common.RPCRequest, conn userc
 		if errors.Is(err, rpc.ErrNilResponse) {
 			// if err was for a nil response then we will return an RPC result of null to the caller (this is a valid "not-found" response for some methods)
 			response[common.JSONKeyResult] = nil
+			w.fileLogger.Info(fmt.Sprintf("Request method: %s, request params: %s, encryptionToken of sender: %s, response: %s", request.Method, request.Params, hexUserID, response))
 			return response, nil
 		}
 		return nil, err
@@ -123,6 +129,7 @@ func (w *WalletExtension) ProxyEthRequest(request *common.RPCRequest, conn userc
 	// todo (@ziga) - fix this upstream on the decode
 	// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-658.md
 	adjustStateRoot(rpcResp, response)
+	w.fileLogger.Info(fmt.Sprintf("Request method: %s, request params: %s, encryptionToken of sender: %s, response: %s", request.Method, request.Params, hexUserID, response))
 
 	return response, nil
 }