FS-9952: Add blade rpc error response creation

libs/libblade/src/blade_rpcproto.c

@@ -811,6 +811,31 @@ KS_DECLARE(ks_rpcmessageid_t) blade_rpc_create_response(cJSON *request,
 	return msgid;
 }
 
+KS_DECLARE(ks_rpcmessageid_t) blade_rpc_create_errorresponse(cJSON *request,
+                                                    cJSON **errorP,
+                                                    cJSON **responseP)
+{
+	ks_rpcmessageid_t msgid = blade_rpc_create_response(request, NULL, responseP);
+
+	if (msgid) {
+
+		if 	(errorP) {
+
+			if (*errorP) {
+				cJSON_AddItemToObject(*responseP, "error", *errorP);
+			}
+			else {
+				cJSON *error = cJSON_CreateObject();
+				cJSON_AddItemToObject(*responseP, "error", error);
+				*errorP = error;
+			}
+		}	
+	}	
+	
+	return msgid;	
+}
+
+
 const char BLADE_JRPC_METHOD[] = "method";
 const char BLADE_JRPC_ID[]     = "id";
 const char BLADE_JRPC_FIELDS[] = "blade";

libs/libblade/src/include/blade_rpcproto.h

@@ -127,6 +127,10 @@ KS_DECLARE(ks_rpcmessageid_t) blade_rpc_create_response(cJSON *request,
 													cJSON **reply,
 													cJSON **response);
 
+KS_DECLARE(ks_rpcmessageid_t) blade_rpc_create_errorresponse(cJSON *request,
+													cJSON **reply,
+													cJSON **response);
+
 KS_DECLARE(ks_status_t) blade_rpc_parse_message(cJSON *message,
 													char **namespace,
 													char **method,

libs/libks/src/ks_rpcmessage.c

@@ -286,7 +286,7 @@ KS_DECLARE(ks_rpcmessageid_t) ks_rpcmessage_create_errorresponse(
 												cJSON **errorP, 
 												cJSON **responseP)
 {
-	ks_rpcmessageid_t msgid = ks_rpcmessage_new_response(request, errorP, responseP);
+	ks_rpcmessageid_t msgid = ks_rpcmessage_new_response(request, NULL, responseP);
 	cJSON *respmsg = *responseP;
 
 	if (msgid) { 
@@ -296,6 +296,9 @@ KS_DECLARE(ks_rpcmessageid_t) ks_rpcmessage_create_errorresponse(
 			*errorP = error;
 			cJSON_AddItemToObject(respmsg, ERROR, error);
 		}
+		else if (errorP && *errorP) {
+			cJSON_AddItemToObject(*responseP, ERROR, *errorP);	
+		}
 	}
 
     return msgid;