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Erlang Chat
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-module(mini_chat). | |
-compile(export_all). | |
-define(ACTIVE_OPTIONS, [{reuseaddr, true}]). | |
% Commands start with "/", char 47 | |
is_command(Str) -> hd(Str) =:= 47. | |
chatroom(Users) -> | |
process_flag(trap_exit, true), | |
receive | |
{users, Requester} -> | |
io:format("~p~n", [Users]), | |
Requester ! Users, | |
chatroom(Users); | |
{join, Username, Pid} -> | |
link(Pid), | |
self() ! {dispatch_msg, "SYSTEM", string:concat(Username, " has joined the channel.\n")}, | |
chatroom([{Username, Pid} | Users]); | |
{remove, User} -> | |
chatroom(Users -- [User]); | |
{dispatch_msg, From, Msg} -> | |
case lists:keyfind(From, 1, Users) of | |
{FromName, _FromPid} = User -> | |
FormatMsg = io_lib:format(string:join(["~s: ", Msg], ""), | |
[FromName]), | |
F = fun({_,Pid}) -> Pid ! {message, FormatMsg} end, | |
Rest = lists:delete(User, Users), | |
lists:foreach(F, Rest); | |
false -> | |
ok | |
end, | |
chatroom(Users); | |
stop -> | |
ok | |
end. | |
user(Username) -> | |
chat ! {join, Username, self()}, | |
user(Username, chat). | |
user(Username, Chatroom) -> | |
receive | |
{send, Msg} -> | |
Chatroom ! {dispatch_msg, Username, Msg}, | |
user(Username, Chatroom); | |
{message, Msg} -> | |
io:fwrite(Msg), | |
user(Username, Chatroom) | |
end. | |
tcp_user(Socket) -> | |
receive | |
{tcp, Socket, "/nick " ++ Username} -> | |
tcp_user(Socket, string:strip(Username, right, $\n)); | |
{tcp, Socket, _Data} -> | |
gen_tcp:send(Socket, "Set a nickname with /nick.\n"), | |
tcp_user(Socket) | |
end. | |
tcp_user(Socket, Username) -> | |
chat ! {join, Username, self()}, | |
tcp_user(Socket, Username, chat). | |
tcp_user(Socket, Username, Chatroom) -> | |
receive | |
{tcp, Socket, Data} -> | |
Chatroom ! {dispatch_msg, Username, Data}, | |
tcp_user(Socket, Username, Chatroom); | |
{message, Msg} -> | |
gen_tcp:send(Socket, lists:flatten(Msg)), | |
tcp_user(Socket, Username, Chatroom) | |
end. | |
listen() -> | |
{ok, LSock} = gen_tcp:listen(6667, ?ACTIVE_OPTIONS), | |
listen(LSock). | |
listen(LSock) -> | |
{ok, Socket} = gen_tcp:accept(LSock), | |
TcpUser = spawn(?MODULE, tcp_user, [Socket]), | |
gen_tcp:controlling_process(Socket, TcpUser), | |
listen(LSock). | |
start() -> | |
register(tcp, spawn(?MODULE, listen, [])), | |
register(chat, spawn(?MODULE, chatroom, [[{"SYSTEM", spawn(fun() -> timer:sleep(infinity) end)}]])). | |
stop() -> | |
exit(whereis(tcp), kill), | |
exit(whereis(chat), kill). |
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Hi wang,
are you working with Erlang for your projects?
thanks