feat: support custom RPC request timeout through env (#116)

* feat: support custom RPC request timeout through env

* chore: fix lint

internal/app/app.go

@@ -51,13 +51,18 @@ func redisConfigFromCli(c *cli.Context) redis.Config {
 func NewListener(c *cli.Context) (*listener.Listener, error) {
 	l := zap.S()
 
+	rpcRequestTimeout := c.Duration(rpcRequestTimeoutFlag.Name)
+	if rpcRequestTimeout == 0 {
+		rpcRequestTimeout = defaultRequestTimeout
+	}
+
 	httpClient := &http.Client{
-		Timeout: defaultRequestTimeout,
+		Timeout: rpcRequestTimeout,
 	}
 	wsRPC := c.String(wsRPCFlag.Name)
 	l.Infow("Connect to node websocket rpc", "rpc", wsRPC)
 	wsEVMClient, err := evmclient.DialContextWithTimeout(
-		context.Background(), wsRPC, httpClient, defaultRequestTimeout)
+		context.Background(), wsRPC, httpClient, rpcRequestTimeout)
 	if err != nil {
 		l.Errorw("Fail to connect to node", "rpc", wsRPC, "error", err)
 
@@ -67,7 +72,7 @@ func NewListener(c *cli.Context) (*listener.Listener, error) {
 	httpRPC := c.String(httpRPCFlag.Name)
 	l.Infow("Connect to node http rpc", "rpc", httpRPC)
 	httpEVMClient, err := evmclient.DialContextWithTimeout(
-		context.Background(), httpRPC, httpClient, defaultRequestTimeout)
+		context.Background(), httpRPC, httpClient, rpcRequestTimeout)
 	if err != nil {
 		l.Errorw("Fail to connect to node", "rpc", httpRPC, "error", err)
 

internal/app/flags.go

@@ -26,6 +26,12 @@ var (
 		Value:   "http://localhost:8545",
 		Usage:   "HTTP RPC to connect to blockchain node, default: http://localhost:8545",
 	}
+	rpcRequestTimeoutFlag = &cli.DurationFlag{
+		Name:    "rpc-request-timeout",
+		EnvVars: []string{"RPC_REQUEST_TIMEOUT"},
+		Value:   10 * time.Second, // nolint:gomnd
+		Usage:   "Timeout for RPC request",
+	}
 	sanityNodeRPCFlag = &cli.StringFlag{
 		Name:    "sanity-node-rpc",
 		EnvVars: []string{"SANITY_NODE_RPC"},
@@ -212,6 +218,7 @@ func NewFlags() []cli.Flag {
 		logLevelFlag,
 		wsRPCFlag,
 		httpRPCFlag,
+		rpcRequestTimeoutFlag,
 		sanityNodeRPCFlag,
 		sanityCheckIntervalFlag,
 	}