142 lines
4.3 KiB
Erlang
142 lines
4.3 KiB
Erlang
-module(ggs_server).
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-behaviour(gen_server).
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%% API
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-export([start_link/1,
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start_link/0,
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stop/0
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]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2,
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handle_info/2, terminate/2, code_change/3]).
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-define(SERVER, ?MODULE).
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-define(DEFAULT_PORT, 1055).
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-record(state, {port, lsock, client_vm_map = []}).
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%%%====================================================
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%%% API
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%%%====================================================
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%%-----------------------------------------------------
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%% @doc Starts the server
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%% @end
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%%-----------------------------------------------------
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start_link(Port) ->
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gen_server:start_link({local, ?SERVER}, ?MODULE, [Port], []).
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start_link() ->
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start_link(?DEFAULT_PORT).
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%%-----------------------------------------------------
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%% @doc Stops the server.
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%% @spec stop() -> ok
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%% @end
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%%-----------------------------------------------------
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stop() ->
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gen_server:cast(?SERVER, stop).
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%%-----------------------------------------------------
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%% gen_server callbacks
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%%-----------------------------------------------------
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init([Port]) ->
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case gen_server:call(ggs_backup, get_backup) of
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{backup_state, not_initialized} ->
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{ok, LSock} = gen_tcp:listen(Port, [{active, true},
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{reuseaddr, true}]),
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{ok, #state{port = Port, lsock = LSock}, 0};
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{backup_state, State} ->
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{ok, LSock} = gen_tcp:listen(Port, [{active, true},
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{reuseaddr, true}]),
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{ok, State#state{lsock = LSock}, 0}
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end.
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handle_call({backup_state, OldState}, _From, _State) ->
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io:format("Received old state from backup~n"),
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{noreply, OldState}.
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handle_info({tcp, Socket, RawData}, State) ->
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ggs_protocol:parse(RawData),
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{noreply, State#state{lsock = Socket}};
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handle_info({tcp_closed, Socket}, State) ->
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gen_tcp:close(Socket),
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{stop, "Client closed socket", State};
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handle_info(timeout, #state{lsock = LSock} = State) ->
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{ok, _Sock} = gen_tcp:accept(LSock),
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{noreply, State};
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handle_info(Other, _State) ->
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erlang:display(Other).
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terminate(_Reason, _State) ->
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ok.
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code_change(_OldVsn, State, _Extra) ->
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{ok, State}.
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%%-----------------------------------------------------
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%% Internal functions
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%%-----------------------------------------------------
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handle_cast(stop, State) ->
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{stop, normal, State};
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% Handle javascript defines
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handle_cast({srv_cmd, "define", Headers, Data}, State) ->
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Token = ggs_protocol:getToken(Headers),
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GameVM = getJSVM(Token, State),
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ggs_vm_runner:define(GameVM, Data),
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send(State#state.lsock, "Token", "Okay, defined that for you!"),
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{noreply, State};
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% Handle javascript calls
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handle_cast({srv_cmd, "call", Headers, Data}, State) ->
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Token = ggs_protocol:getToken(Headers),
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io:format("Got call request: ~p~n", [Data]),
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GameVM = getJSVM(Token, State),
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Ret = ggs_vm_runner:user_command(GameVM, "User", Data, []),
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send(State#state.lsock, Token, "JS says:", binary_to_list(Ret)),
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{noreply, State};
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% Set the new state to the reference generated, and JSVM associated
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%handle_cast({server, hello, Headers}, State) ->
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handle_cast({srv_cmd, "hello", Headers, _Data}, State) ->
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GameToken = case proplist:get_value(game_token, Headers) of
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undefined -> getNewToken();
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GT -> GT
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end,
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ClientToken = getNewToken(),
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OldMap = State#state.client_vm_map,
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GameVM = getJSVM(ClientToken, State),
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NewState = State#state{client_vm_map = OldMap ++ [{ClientToken, GameVM, GameToken}]},
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gen_server:cast(ggs_backup, {set_backup, NewState}),
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{noreply, NewState}.
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%%-----------------------------------------------------
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%% Helpers
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%%-----------------------------------------------------
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getNewToken() ->
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string:strip(os:cmd("uuidgen"), right, $\n ).
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getJSVM(ClientToken, State) ->
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VMs = State#state.client_vm_map,
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{value, {_,VM}} = lists:keysearch(ClientToken, 1, VMs),
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VM.
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%getGameVMByGameToken(GameToken, State) ->
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% VMs = State#state.client_vm_map,
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% {value, {_,VM}} = lists:keysearch(GameToken, 3, VMs),
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% VM.
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send(Socket, RefID, String) ->
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gen_tcp:send(Socket, string:join([RefID,String,"\n"], " ")).
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send(Socket, RefID, String1, String2) ->
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gen_tcp:send(Socket, string:join([RefID,String1, String2,"\n"], " ")).
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