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|
defmodule Chessh.SSH.Client do
alias IO.ANSI
require Logger
use GenServer
@clear_codes [
ANSI.clear(),
ANSI.home()
]
@min_terminal_width 64
@min_terminal_height 38
@max_terminal_width 220
@max_terminal_height 100
defmodule State do
defstruct tui_pid: nil,
width: 0,
height: 0,
player_session: nil,
screen_processes: []
end
@impl true
def init([%State{} = state]) do
send(self(), {:set_screen_process, Chessh.SSH.Client.Menu, %Chessh.SSH.Client.Menu.State{}})
{:ok, state}
end
@impl true
def handle_info(
{:set_screen_process, module, screen_state},
%State{width: width, height: height, screen_processes: screen_processes} = state
) do
{:ok, new_screen_pid} = GenServer.start_link(module, [%{screen_state | client_pid: self()}])
send(new_screen_pid, {:render, width, height})
{:noreply, %{state | screen_processes: [new_screen_pid | screen_processes]}}
end
@impl true
def handle_info(:quit, %State{} = state) do
{:stop, :normal, state}
end
@impl true
def handle_info(msg, state) do
[burst_ms, burst_rate] =
Application.get_env(:chessh, RateLimits)
|> Keyword.take([:player_session_message_burst_ms, :player_session_message_burst_rate])
|> Keyword.values()
case Hammer.check_rate_inc(
"player-session-#{state.player_session.id}-burst-message-rate",
burst_ms,
burst_rate,
1
) do
{:allow, _count} ->
handle(msg, state)
{:deny, _limit} ->
{:noreply, state}
end
end
def handle(
{:data, data},
%State{width: width, height: height, screen_processes: [screen_pid | rest_processes]} =
state
) do
case keymap(data) do
:quit ->
{:stop, :normal, state}
:previous_screen ->
Logger.debug(inspect(rest_processes))
Process.exit(screen_pid, :kill)
{:noreply, %State{state | screen_processes: rest_processes}}
action ->
send(screen_pid, {:input, width, height, action})
{:noreply, state}
end
end
def handle(
:refresh,
%State{} = state
) do
render(state)
{:noreply, state}
end
def handle(
{:send_to_ssh, data},
%State{width: width, height: height, tui_pid: tui_pid} = state
) do
case get_terminal_dim_msg(width, height) do
{true, msg} -> send(tui_pid, {:send_data, msg})
{false, _} -> send(tui_pid, {:send_data, data})
end
{:noreply, state}
end
def handle(
{:resize, {width, height}},
%State{tui_pid: tui_pid, screen_processes: [screen_pid | _]} = state
) do
case get_terminal_dim_msg(width, height) do
{true, msg} -> send(tui_pid, {:send_data, msg})
{false, _} -> send(screen_pid, {:render, width, height})
end
{:noreply, %State{state | width: width, height: height}}
end
def keymap(key) do
case key do
# Exit keys - C-c and C-d
<<3>> -> :quit
<<4>> -> :quit
# C-b
<<2>> -> :previous_screen
# Arrow keys
"\e[A" -> :up
"\e[B" -> :down
"\e[D" -> :left
"\e[C" -> :right
"\r" -> :return
x -> x
end
end
defp get_terminal_dim_msg(width, height) do
case {height > @max_terminal_height, height < @min_terminal_height,
width > @max_terminal_width, width < @min_terminal_width} do
{true, _, _, _} -> {true, @clear_codes ++ ["The terminal height is too large."]}
{_, true, _, _} -> {true, @clear_codes ++ ["The terminal height is too small."]}
{_, _, true, _} -> {true, @clear_codes ++ ["The terminal width is too large"]}
{_, _, _, true} -> {true, @clear_codes ++ ["The terminal width is too small."]}
{false, false, false, false} -> {false, nil}
end
end
defp render(%State{
tui_pid: tui_pid,
width: width,
height: height,
screen_processes: [screen_pid | _]
}) do
{out_of_range, msg} = get_terminal_dim_msg(width, height)
if out_of_range && msg do
send(tui_pid, {:send_data, msg})
else
send(screen_pid, {:render, width, height})
end
end
end
|
