fix: load config store into memory on plugin start and after LOAD commands

C1: Call config_store->load_from_runtime() in mysqlx_start() so that
the in-memory store is populated before listeners begin accepting
connections. Without this, resolve_identity() always returned nullopt
and no client could authenticate.

I8: Add reload_config_store() call at the end of each LOAD admin
command callback (load_users_to_runtime, load_routes_to_runtime,
load_backend_endpoints_to_runtime) so that the in-memory config store
is refreshed immediately after runtime tables are updated.

plugins/mysqlx/src/mysqlx_admin_schema.cpp

@@ -1,5 +1,6 @@
 #include "mysqlx_admin_schema.h"
 
+#include "mysqlx_plugin.h"
 #include "sqlite3db.h"
 
 #include <string>
@@ -122,6 +123,11 @@ bool copy_table(SQLite3DB& db, const char* source_table, const char* runtime_tab
 	return true;
 }
 
+static void reload_config_store(SQLite3DB& admindb) {
+	std::string err;
+	mysqlx_context().config_store->load_from_runtime(admindb, err);
+}
+
 ProxySQL_PluginCommandResult load_users_to_runtime(const ProxySQL_PluginCommandContext& ctx, const char*) {
 	if (ctx.admindb == nullptr) {
 		return command_failure("mysqlx users load requires admin db");
@@ -133,6 +139,7 @@ ProxySQL_PluginCommandResult load_users_to_runtime(const ProxySQL_PluginCommandC
 	ProxySQL_PluginCommandResult result {0, 0, ""};
 	result.rows_affected = ctx.admindb->return_one_int("SELECT COUNT(*) FROM runtime_mysqlx_users");
 	result.message = "mysqlx users loaded to runtime";
+	reload_config_store(*ctx.admindb);
 	return result;
 }
 
@@ -147,6 +154,7 @@ ProxySQL_PluginCommandResult load_routes_to_runtime(const ProxySQL_PluginCommand
 	ProxySQL_PluginCommandResult result {0, 0, ""};
 	result.rows_affected = ctx.admindb->return_one_int("SELECT COUNT(*) FROM runtime_mysqlx_routes");
 	result.message = "mysqlx routes loaded to runtime";
+	reload_config_store(*ctx.admindb);
 	return result;
 }
 
@@ -161,6 +169,7 @@ ProxySQL_PluginCommandResult load_backend_endpoints_to_runtime(const ProxySQL_Pl
 	ProxySQL_PluginCommandResult result {0, 0, ""};
 	result.rows_affected = ctx.admindb->return_one_int("SELECT COUNT(*) FROM runtime_mysqlx_backend_endpoints");
 	result.message = "mysqlx backend endpoints loaded to runtime";
+	reload_config_store(*ctx.admindb);
 	return result;
 }
 

plugins/mysqlx/src/mysqlx_plugin.cpp

@@ -21,6 +21,12 @@ bool mysqlx_start() {
 	if (ctx.services != nullptr && ctx.services->get_admindb != nullptr) {
 		SQLite3DB* admindb = ctx.services->get_admindb();
 		if (admindb != nullptr) {
+			std::string err;
+			if (!ctx.config_store->load_from_runtime(*admindb, err)) {
+				if (ctx.services->log_message != nullptr) {
+					ctx.services->log_message(3, err.c_str());
+				}
+			}
 			mysqlx_start_listeners_from_runtime_routes(*admindb);
 		}
 	}