Implemented error handling for roller run

cmd/run/run.go

@@ -6,6 +6,12 @@ import (
 	"os/exec"
 	"path/filepath"
 
+	"errors"
+
+	"bytes"
+
+	"strings"
+
 	initconfig "github.com/dymensionxyz/roller/cmd/config/init"
 	"github.com/dymensionxyz/roller/cmd/utils"
 	"github.com/spf13/cobra"
@@ -22,30 +28,46 @@ func RunCmd() *cobra.Command {
 			rollappConfig, err := initconfig.LoadConfigFromTOML(home)
 			utils.PrettifyErrorIfExists(err)
 			startRollappCmd := getStartRollapCmd(rollappConfig, cmd.Flag(daLightClientEndpointFlag).Value.String())
+			var stderr bytes.Buffer
+			startRollappCmd.Stderr = &stderr
 			startRollappErr := startRollappCmd.Start()
+			if startRollappErr != nil {
+				errMsg := parseError(stderr.String())
+				utils.PrettifyErrorIfExists(errors.New(errMsg))
+			}
 			utils.PrettifyErrorIfExists(startRollappErr)
 			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()
-			utils.PrettifyErrorIfExists(err)
+			if err != nil {
+				errMsg := parseError(stderr.String())
+				utils.PrettifyErrorIfExists(errors.New(errMsg))
+			}
 		},
 	}
-	addFlags(runCmd)
 	utils.AddGlobalFlags(runCmd)
+	addFlags(runCmd)
 	return runCmd
 }
 
 func addFlags(cmd *cobra.Command) {
 	cmd.Flags().StringP(daLightClientEndpointFlag, "", "http://localhost:26659", "The DA light client endpoint.")
 }
+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, daLightClientEndpoint string) *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]}`, daLightClientEndpoint)
+func getStartRollapCmd(rollappConfig initconfig.InitConfig, daEndpoint string) *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]}`, daEndpoint)
 	rollappConfigDir := filepath.Join(rollappConfig.Home, consts.ConfigDirName.Rollapp)
-	settlementConfig := fmt.Sprintf(`{"node_address": "%s", "rollapp_id": "%s", "dym_account_name": "%s", "keyring_home_dir": "%s", "keyring_backend":"test", "gas_fees": "2000000udym"}`,
-		rollappConfig.HubData.RPC_URL, rollappConfig.RollappID, consts.KeyNames.HubSequencer, rollappConfigDir)
+	settlementConfig := fmt.Sprintf(`{"node_address": "%s", "rollapp_id": "%s", "dym_account_name": "%s", "keyring_home_dir": "%s", "keyring_backend":"test", "gas_fees": "2000000udym"}`, rollappConfig.HubData.RPC_URL, rollappConfig.RollappID,
+		consts.KeyNames.HubSequencer, rollappConfigDir)
 
 	return exec.Command(
 		rollappConfig.RollappBinary, "start",