src/ice_candidate/helper.h

#pragma once
#include "../ice_server/server.h"
#include <rawrtc/ice_gatherer.h>
#include <rawrtcc/code.h>
#include <re.h>
#include <rew.h>

/*
 * Local candidate helper.
 */
struct rawrtc_candidate_helper {
    struct le le;
    struct rawrtc_ice_gatherer* gatherer;
    struct ice_lcand* candidate;
    struct udp_helper* udp_helper;
    uint_fast8_t srflx_pending_count;
    struct list stun_sessions;
    uint_fast8_t relay_pending_count;
};

/*
 * STUN keep-alive session.
 */
struct rawrtc_candidate_helper_stun_session {
    struct le le;
    struct rawrtc_candidate_helper* candidate_helper;
    struct stun_keepalive* stun_keepalive;
    struct rawrtc_ice_server_url* url;
    bool pending;
};

enum rawrtc_code rawrtc_candidate_helper_create(
    struct rawrtc_candidate_helper** const candidate_helperp,  // de-referenced
    struct rawrtc_ice_gatherer* gatherer,
    struct ice_lcand* const candidate,
    udp_helper_recv_h* const receive_handler,
    void* const arg);

enum rawrtc_code rawrtc_candidate_helper_set_receive_handler(
    struct rawrtc_candidate_helper* const candidate_helper,
    udp_helper_recv_h* const receive_handler,
    void* const arg);

enum rawrtc_code rawrtc_candidate_helper_find(
    struct rawrtc_candidate_helper** const candidate_helperp,
    struct list* const candidate_helpers,
    struct ice_lcand* re_candidate);

enum rawrtc_code rawrtc_candidate_helper_stun_session_create(
    struct rawrtc_candidate_helper_stun_session** const sessionp,  // de-referenced
    struct rawrtc_ice_server_url* const url);

enum rawrtc_code rawrtc_candidate_helper_stun_session_add(
    struct rawrtc_candidate_helper_stun_session* const session,
    struct rawrtc_candidate_helper* const candidate_helper,
    struct stun_keepalive* const stun_keepalive);

bool rawrtc_candidate_helper_remove_stun_sessions_handler(struct le* le, void* arg);