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|
-module(dispatcher).
-export([start/0, init/0, handle/2]).
start() ->
%% load server module from common directory,
%% used form server and client
code:purge(server),
code:load_abs("../common/server"),
%% spawn media backend in seperat process
try spawn(media, init, []) of
_ ->
io:format("Media-Backend started!~n")
catch
_: Why ->
io:format("Error starting media backend: ~w! Exiting.~n", [Why]),
exit(1)
end,
%% start server (registered as dis)
%% server-module will call handle if message arrives and init to
%% initialize the status
try server:start(dis, dispatcher) of
true ->
io:format("Server started!~n"),
true
catch
_ ->
io:format("Error starting server! Exiting.~n"),
exit(1)
end.
init() ->
dict:new().
handle({register, {User, Password}}, Dict) ->
case dict:find(User, Dict) of
{ok, _}->
{{error, duplicated_user}, Dict};
_ ->
io:format("User created: ~s~n", [User]),
{{ok, user_created}, dict:store(User, Password, Dict)}
end;
handle({login, {Node, User, Password}}, Dict) ->
case dict:find(User, Dict) of
{ok, Password} ->
case client:start(Node) of
{ok, Pid} ->
{{ok, {logged_in, Pid}}, Dict};
Why ->
{{error, {unable_to_login, Why}}, Dict}
end;
_ ->
{{error, user_or_password_invalid}, Dict}
end;
handle({'EXIT', _, _}, Dict) ->
Dict;
handle(Cmd, Dict) ->
%% standard command, to find transmission errors
{{error, {unknown_command, Cmd}}, Dict}.
|
