Added handling for running two sequencers on the same machine for rol…

…ler run

cmd/run/run.go

@@ -1,10 +1,15 @@
 package run
 
 import (
+	"errors"
 	"fmt"
 	"os/exec"
 	"path/filepath"
 
+	"bytes"
+
+	"strings"
+
 	initconfig "github.com/dymensionxyz/roller/cmd/config/init"
 	"github.com/dymensionxyz/roller/cmd/utils"
 	"github.com/spf13/cobra"
@@ -19,20 +24,36 @@ func RunCmd() *cobra.Command {
 			rollappConfig, err := initconfig.LoadConfigFromTOML(home)
 			initconfig.OutputCleanError(err)
 			startRollappCmd := getStartRollapCmd(rollappConfig)
+			var stderr bytes.Buffer
+			startRollappCmd.Stderr = &stderr
 			err = startRollappCmd.Start()
-			initconfig.OutputCleanError(err)
+			if err != nil {
+				errMsg := parseError(stderr.String())
+				initconfig.OutputCleanError(errors.New(errMsg))
+			}
 			fmt.Println("💈 The Rollapp sequencer is running on your local machine!")
 			fmt.Println("💈 EVM RPC: http://0.0.0.0:8545")
 			fmt.Println("💈 Node RPC: http://0.0.0.0:26657")
 			fmt.Println("💈 Rest API: http://0.0.0.0:1317")
 			err = startRollappCmd.Wait()
-			initconfig.OutputCleanError(err)
+			if err != nil {
+				errMsg := parseError(stderr.String())
+				initconfig.OutputCleanError(errors.New(errMsg))
+			}
 		},
 	}
 	utils.AddGlobalFlags(runCmd)
 	return runCmd
 }
 
+func parseError(errMsg string) string {
+	lines := strings.Split(errMsg, "\n")
+	if len(lines) > 0 && lines[0] == "Error: failed to initialize database: resource temporarily unavailable" {
+		return "The Rollapp sequencer is already running. Only one sequencer can run on the machine at any given time."
+	}
+	return errMsg
+}
+
 func getStartRollapCmd(rollappConfig initconfig.InitConfig) *exec.Cmd {
 	daConfig := fmt.Sprintf(`{"base_url": "%s", "timeout": 60000000000, "fee":20000, "gas_limit": 20000000, "namespace_id":[0,0,0,0,0,0,255,255]}`, rollappConfig.LightNodeEndpoint)
 	rollappConfigDir := filepath.Join(rollappConfig.Home, initconfig.ConfigDirName.Rollapp)