Read RPC query rates from a json file

cmd/common.go

@@ -39,6 +39,7 @@ func addDatabaseFlags(command *cobra.Command) {
 func addNitroFlags(command *cobra.Command) {
 	// nitro flags
 	command.PersistentFlags().Bool("nitro-run-node-in-process", false, "nitro run node in process")
+	command.PersistentFlags().String("nitro-rpc-query-rates-file", "", "nitro rpcQueryRatesFile")
 
 	command.PersistentFlags().String("nitro-pk", "", "nitro pk")
 	command.PersistentFlags().String("nitro-chain-pk", "", "nitro chainPk")
@@ -52,13 +53,14 @@ func addNitroFlags(command *cobra.Command) {
 	command.PersistentFlags().Int("nitro-rpc-port", 4005, "nitro rpcPort")
 	command.PersistentFlags().Int("nitro-ws-msg-port", 5005, "nitro wsMsgPort")
 	command.PersistentFlags().Uint("nitro-chain-start-block", 0, "nitro chainStartBlock")
-	command.PersistentFlags().String("nitro-tls-cert-filepath", "./nitroTLS/statechannels.org.pem", "nitro tlsCertFilepath")
-	command.PersistentFlags().String("nitro-tls-key-filepath", "./nitroTLS/statechannels.org_key.pem", "nitro tlsKeyFilepath")
+	command.PersistentFlags().String("nitro-tls-cert-filepath", "", "nitro tlsCertFilepath")
+	command.PersistentFlags().String("nitro-tls-key-filepath", "", "nitro tlsKeyFilepath")
 
 	command.PersistentFlags().String("nitro-endpoint", "", "nitro endpoint")
 
 	// nitro flag bindings
 	viper.BindPFlag("nitro.runNodeInProcess", command.PersistentFlags().Lookup("nitro-run-node-in-process"))
+	viper.BindPFlag("nitro.rpcQueryRatesFile", command.PersistentFlags().Lookup("nitro-rpc-query-rates-file"))
 
 	viper.BindPFlag("nitro.inProcesssNode.pk", command.PersistentFlags().Lookup("nitro-pk"))
 	viper.BindPFlag("nitro.inProcesssNode.chainPk", command.PersistentFlags().Lookup("nitro-chain-pk"))

cmd/serve.go

@@ -17,8 +17,10 @@ package cmd
 
 import (
 	"crypto/tls"
+	"encoding/json"
 	"errors"
 	"fmt"
+	"io/fs"
 	"math/big"
 	"net/http"
 	"net/url"
@@ -144,12 +146,9 @@ func serve() {
 		voucherValidator = nitroRpc.RemoteVoucherValidator{Client: nitroRpcClient}
 	}
 
-	// TODO: Read from config file
-	queryRates := map[string]*big.Int{
-		"eth_getBlockByNumber": big.NewInt(50),
-		"eth_getBlockByHash":   big.NewInt(50),
-		"eth_getStorageAt":     big.NewInt(50),
-		"eth_getLogs":          big.NewInt(50),
+	queryRates, err := readRpcQueryRates(nitroConfig.RpcQueryRatesFile)
+	if err != nil {
+		logWithCommand.Fatal(err)
 	}
 
 	if err := startServers(server, serverConfig, voucherValidator, queryRates); err != nil {
@@ -513,3 +512,25 @@ func initNitroRpcServer(node *nitroNode.Node, pm paymentsmanager.PaymentsManager
 	slog.Info("Completed Nitro RPC server initialization")
 	return rpcServer, nil
 }
+
+func readRpcQueryRates(filepath string) (map[string]*big.Int, error) {
+	jsonFile, err := os.Open(filepath)
+	defer jsonFile.Close()
+
+	if err != nil {
+		if errors.Is(err, fs.ErrNotExist) {
+			result := make(map[string]*big.Int)
+			return result, nil
+		}
+		return nil, err
+	}
+
+	var result map[string]*big.Int
+	decoder := json.NewDecoder(jsonFile)
+	err = decoder.Decode(&result)
+	if err != nil {
+		return nil, err
+	}
+
+	return result, nil
+}