feat: add validate rpc when setup relayer

cmd/relayer/setup/setup.go

@@ -268,11 +268,16 @@ func getPreRunInfo(home string) (*consts.RollappData, *consts.HubData, string, e
 		pterm.Error.Println("failed to retrieve rollapp rpc endpoint: ", err)
 		return nil, nil, "", err
 	}
-	raRpc = strings.TrimSuffix(raRpc, "/")
+	pterm.Info.Printf("validating rollapp rpc endpoint: %s\n", raRpc)
+	validatedRpc, err := sequencerutils.ValidateRollappRPCEndpoint(raID, raRpc)
+	if err != nil {
+		pterm.Error.Println("rollapp rpc endpoint validation failed:", err)
+		return nil, nil, "", err
+	}
 
 	raData := consts.RollappData{
 		ID:     raID,
-		RpcUrl: raRpc,
+		RpcUrl: validatedRpc,
 	}
 	return &raData, hd, kb, nil
 }

utils/sequencer/rpc.go

@@ -0,0 +1,81 @@
+package sequencer
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+type tendermintStatusResponse struct {
+	Result struct {
+		NodeInfo struct {
+			Network string `json:"network"`
+		} `json:"node_info"`
+	} `json:"result"`
+}
+
+func ValidateRollappRPCEndpoint(rollappID, endpoint string) (string, error) {
+	trimmed := strings.TrimSpace(endpoint)
+	if trimmed == "" {
+		return "", fmt.Errorf("rollapp rpc endpoint is empty")
+	}
+
+	normalized := normalizeRpcScheme(trimmed)
+	normalized = strings.TrimRight(normalized, "/")
+
+	statusURL := normalized + "/status"
+	client := &http.Client{
+		Timeout: 10 * time.Second,
+	}
+
+	resp, err := client.Get(statusURL)
+	if err != nil {
+		return "", fmt.Errorf("failed to reach rollapp rpc endpoint %s: %w", normalized, err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf(
+			"rollapp rpc endpoint %s returned %s from /status",
+			normalized,
+			resp.Status,
+		)
+	}
+
+	var status tendermintStatusResponse
+	if err := json.NewDecoder(resp.Body).Decode(&status); err != nil {
+		return "", fmt.Errorf("failed to decode /status from %s: %w", statusURL, err)
+	}
+
+	chainID := strings.TrimSpace(status.Result.NodeInfo.Network)
+	if chainID == "" {
+		return "", fmt.Errorf("rollapp rpc endpoint %s returned empty chain-id in /status response", normalized)
+	}
+	if chainID != rollappID {
+		return "", fmt.Errorf(
+			"rollapp rpc endpoint %s reports chain-id %s, expected %s",
+			normalized,
+			chainID,
+			rollappID,
+		)
+	}
+
+	return normalized, nil
+}
+
+func normalizeRpcScheme(endpoint string) string {
+	switch {
+	case strings.HasPrefix(endpoint, "tcp://"):
+		return "http://" + strings.TrimPrefix(endpoint, "tcp://")
+	case strings.HasPrefix(endpoint, "ws://"):
+		return "http://" + strings.TrimPrefix(endpoint, "ws://")
+	case strings.HasPrefix(endpoint, "wss://"):
+		return "https://" + strings.TrimPrefix(endpoint, "wss://")
+	case strings.HasPrefix(endpoint, "http://"), strings.HasPrefix(endpoint, "https://"):
+		return endpoint
+	default:
+		return "https://" + endpoint
+	}
+}