ludic/packages/ludic.net/room_tick.ludic

# room_tick.ludic - the matchmaker's side of a frame: STUN asked three times, the room registered
# or asked for, the host's look at who has asked, and a guest's switch to the relay
function net__room_tick(net_st: mut NetState, dt: float) -> void {
  if net_st.net__r_state == NET_R_IDLE or net_st.net__r_role == 0 { return }
  net_st.net__r_t = net_st.net__r_t + dt
  if net_st.net__r_state == NET_R_STUN {
    net__room_stun_tick(net_st)
    return
  }
  if net_st.net__r_state == NET_R_REGISTER or net_st.net__r_state == NET_R_ASK or (net_st.net__r_state == NET_R_ROOM and net_st.net__http != 0) {
    net__room_answer(net_st)
    return
  }
  if net_st.net__r_state == NET_R_DONE {
    # four seconds and not one packet back from the host: through the relay instead (a slow
    # welcome is not a closed router - anything heard means the direct path works)
    let silent = net_st.net__peers[0].heard == net_st.net__dial_heard
    let wait = net__conf(net_st).force_relay or (silent and net_st.net__r_t > 4.0)
    if not net_st.net__via_relay and net_st.net__state == NET_JOINING and net_st.net__relay_ip != 0 and wait { net__use_relay(net_st) }
    return
  }
  if net_st.net__r_state == NET_R_ROOM { net__room_watch(net_st, dt) }
}

# a second and a half for an answer, asked three times; without one, inside addresses only
function net__room_stun_tick(net_st: mut NetState) -> void {
  if net_st.net__pub_ip == 0 and net_st.net__r_t > 0.5 and net_st.net__r_tries < 3 {
    net_st.net__r_tries += 1
    net_st.net__r_t = 0.0
    net__stun_send(net_st)
    return
  }
  if net_st.net__pub_ip == 0 and net_st.net__r_tries < 3 { return }
  let base = net__conf(net_st).signal_url
  if net_st.net__r_role == 1 {
    net_st.net__http = Http.post(`{base}/rooms`, net__room_body(net_st, "host"))
    net_st.net__r_state = NET_R_REGISTER
  } else {
    net_st.net__http = Http.post(`{base}/rooms/{net_st.net__room}/join`, net__room_body(net_st, "pub"))
    net_st.net__r_state = NET_R_ASK
  }
  net_st.net__r_t = 0.0
}

function net__room_answer(net_st: mut NetState) -> void {
  let st = Http.poll(net_st.net__http)
  if st < 0 {
    if net_st.net__r_t > 12.0 {
      Http.free(net_st.net__http)
      net_st.net__http = 0
      net__room_fail(net_st, NET_WHY_MATCHMAKER_SILENT)
    }
    return
  }
  var v: Val = null
  if st > 0 and Http.ok(net_st.net__http) { v = Json.parse(Http.text(net_st.net__http)) }
  Http.free(net_st.net__http)
  net_st.net__http = 0
  if net_st.net__r_state == NET_R_REGISTER {
    let code = net__json_str(v, "code")
    if len(code) == 0 {
      net__room_fail(net_st, NET_WHY_NO_ROOM_GIVEN)
      return
    }
    net_st.net__room = code
    net__take_relay(net_st, v)
    net_st.net__r_state = NET_R_ROOM
    net_st.net__poll_t = 0.0
    net__log(`room {code}`)
    net__fact(net_st, NET_ROOM, -1, 0, 0, code)
    return
  }
  if net_st.net__r_state == NET_R_ASK {
    if v == null {
      net__room_fail(net_st, NET_WHY_NO_ROOM)
      return
    }
    net__take_relay(net_st, v)
    net__room_connect(net_st, net__json_str(v, "host"), net__json_str(v, "local"))
    return
  }
  # the host's look at the room
  if v != null and value_has(v, "guests") != 0 {
    let l = value_get(v, "guests")
    for i in 0 .. value_count(l) {
      let g = value_at(l, i)
      net__new_guest(net_st, net__json_str(g, "pub"), net__json_str(g, "local"))
    }
  }
}

# the host, registered: its relay address kept fresh, new guests punched for, the room looked at
function net__room_watch(net_st: mut NetState, dt: float) -> void {
  net_st.net__relay_t = net_st.net__relay_t - dt
  if net_st.net__relay_t < 0.0 and net_st.net__relay_ip != 0 {
    net_st.net__relay_t = 3.0
    net__relay_hello(net_st)
  }
  net__punch_tick(net_st, dt)
  net_st.net__poll_t = net_st.net__poll_t - dt
  if net_st.net__poll_t < 0.0 {
    net_st.net__poll_t = 1.0
    net_st.net__http = Http.get(`{net__conf(net_st).signal_url}/rooms/{net_st.net__room}`)
    net_st.net__r_t = 0.0
  }
}