stellar-stellar-2022/src/plugin_manager/plugin_manager.cpp

#include "deps/uthash/uthash.h"
#include "sdk/include/session.h"
#include "sdk/include/plugin.h"
#include "session_manager.h"
#include "plugin_manager.h"

#include <sys/queue.h>
#include <assert.h>

/******************************************************************************
 * CallBack Static Hash Table (For Global)
 ******************************************************************************/

struct session_event_callback_static
{
	enum session_event_type event;
	fn_session_event_callback *callback;
};

/*
 * Hast table
 *
 * key: string -> session_type
 * val: array  -> event_cbs
 */
struct managed_session_event_callback
{
	char session_type[16];
	struct session_event_callback_static event_cbs[0]; // dynamic array
	// Record the number of callback functions that want to process the current session
	int event_cbs_num;
	UT_hash_handle hh;
};

/******************************************************************************
 * CallBack Runtime Array (For Per Session)
 ******************************************************************************/

struct session_event_callback_runtime
{
	int skip; // for skip this plugin callback
	void *callback_args;

	enum session_event_type event;
	fn_session_event_callback *callback;
};

struct session_plugin_ctx
{
	int event_cbs_num;
	struct session_event_callback_runtime event_cbs[0]; // dynamic array
};

/******************************************************************************
 * struct plugin_manager
 ******************************************************************************/

/*
 * Each plugin has an init_cb and an exit_cb, but may have multiple entry_cb.
 * entry_cb is stored in the global_session_callback_ctx.
 */
struct plugin_ctx
{
	char *name;
	char *library;
	/*
	 * Stores the context generated by the plugin initialization,
	 * which is used to release resources when the plugin ends.
	 */
	void *pme;
	plugin_init_callback *init_cb;
	plugin_exit_callback *exit_cb;
};

struct plugin_manager
{
	struct managed_session_event_callback *cb_table;
	struct plugin_ctx plugins[MAX_PLUGIN_NUM];
};

/******************************************************************************
 * Private API
 ******************************************************************************/

static void plugin_manager_handle_opening_event(struct plugin_manager *plug_mgr, struct stellar_event *event)
{
}

static void plugin_manager_handle_data_event(struct plugin_manager *plug_mgr, struct stellar_event *event)
{
}

static void plugin_manager_handle_closing_event(struct plugin_manager *plug_mgr, struct stellar_event *event)
{
}

/******************************************************************************
 * Public API
 ******************************************************************************/

struct plugin_manager *plugin_manager_create()
{
	struct plugin_manager *plug_mgr = NULL;

	return plug_mgr;
}

void plugin_manager_destory(struct plugin_manager *plug_mgr)
{
	if (plug_mgr)
	{
	}
}

int plugin_manager_load(struct plugin_manager *plug_mgr, const char *plugin_file)
{
	return 0;
}

void plugin_manager_unload(struct plugin_manager *plug_mgr)
{
}

int plugin_manager_register(struct plugin_manager *plug_mgr, const char *session_type, fn_session_event_callback *callback)
{
	return 0;
}

void plugin_manager_dispatch(struct plugin_manager *plug_mgr, struct stellar_event *event)
{
	assert(event);
	struct stellar_session_event_data *event_data = event->session_event_data;
	assert(event_data);
	session_event_type type = event_data->type;

	switch (type)
	{
	case SESSION_EVENT_OPENING:
		plugin_manager_handle_opening_event(plug_mgr, event);
		break;
	case SESSION_EVENT_RAWPKT: /* fall through */
	case SESSION_EVENT_ORDPKT: /* fall through */
	case SESSION_EVENT_META:   /* fall through */
		plugin_manager_handle_data_event(plug_mgr, event);
		break;
	case SESSION_EVENT_CLOSING:
		plugin_manager_handle_closing_event(plug_mgr, event);
		break;
	default:
		// TODO log error
		break;
	}
}