#define TFE_STRING_MAX		2048
#define TFE_SYMBOL_MAX		64
enum tfe_session_proto
{
	SESSION_PROTO_PLAIN=0,
	SESSION_PROTO_SSL,
	SESSION_PROTO_QUIC,
	SESSION_PROTO_SPDY
};
enum tfe_app_proto
{
	APP_PROTO_HTTP1,
	APP_PROTO_HTTP2,
	APP_PROTO_WS,		//websocket
	APP_PROTO_QUIC		//QUIC is a protocol that cross session layer and application layer.
};
enum tfe_conn_dir
{
	CONN_DIR_DOWNSTREAM=0,	//From client to proxy, aka client-side.
	CONN_DIR_UPSTREAM		//From proxy to server, aka server-side.
};
enum tfe_conn_status
{
	CONN_STATUS_NONE,
	CONN_STATUS_ESTABLISHED,
	CONN_STATUS_CLOSED,
};

/* single dst or src socket bufferevent descriptor */
struct tfe_conn
{
	struct layer_addr addr;
	enum tfe_conn_status status;
    struct bufferevent *bev;
} ;

struct tfe_stream
{

	struct tfe_conn upstream;		
	struct tfe_conn downstream;
	void* application_pme;
};


//Return 1 for identify as its traffic;
//Return 0 for unknown traffic;
typedef int proto_pend_cb_t(const struct tfe_stream* stream, struct evbuffer *data, void **pme);

enum tfe_proto_action
{
	PROTO_ATCION_FORWARD,
	PROTO_ACTION_DEFER,
	PROTO_ACTION_STEAL,
	PROTO_ACTION_PASSTHROUGH,
	PROTO_ACTION_CLOSE
};
enum tfe_proto_action_opt
{
	ACTION_OPT_DEFER_TIME_TV,	//value is "struct timeval " which defines in <time.h>, default: time defer is not enabled
	ACTION_OPT_DEFER_BYTES,		//value is size_t, default: defer entire evbufer
	ACTION_OPT_FOWARD_BYTES,	//value is size_t, default: forward entire evbufer
	ACTION_OPT_CLOSE_DIR		//value is enum tfe_conn_dir, default: close both side.
};
int tfe_proto_action_set_opt(const struct tfe_stream* stream,enum tfe_proto_action_opt type, void* value, size_t size);
typedef tfe_proto_action proto_read_cb_t(const struct tfe_stream* stream, struct evbuffer *data, enum tfe_conn_dir dir, void **pme);

typedef void proto_close_cb_t(const struct tfe_stream* stream, int ev, void **pme);

//typedef int proto_onwrite_cb_t(struct tfe_stream*, struct evbuffer *data, void **pme);

struct tfe_proto_module
{
	char symbol[TFE_SYMBOL_MAX];
	proto_pend_cb_t *on_pend;
	proto_read_cb_t *on_read;
	proto_close_cb_t *on_close;
//	proto_onwrite_cb_t *onwrite;
	
};
int tfe_io_write(struct pxy_conn_desc* dest,int dir,struct evbuffer *data);

int tfe_xxx_proto_init(struct tfe_proto_module*m);