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|
-module(dispatcher).
-export([start/0, handle/2, checkUserExists/1]).
checkUserExists([_|_]) ->
false;
checkUserExists(_) ->
true.
start() ->
%% load server module from common directory,
%% used form server and client
code:purge(server),
code:load_abs("../common/server"),
cldb:init(),
%% 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
UserExists = checkUserExists(cldb:ask('_', '_')),
try server:start(dis, dispatcher, UserExists) of
true ->
io:format("Server started: ~w!~n", [UserExists]),
true
catch
_ ->
io:format("Error starting server! Exiting.~n"),
exit(1)
end.
handle({register, {User, Password}}, true) ->
io:format("User created: ~s~n", [User]),
cldb:register(User, Password, admin),
{{ok, user_created}, false};
handle({register, _}, false) ->
{{error, no_rights}, false};
handle({login, {Node, User, Password}}, State) ->
case cldb:login(User, Password) of
{ok, UserRow} ->
case client:start(Node, UserRow) of
{ok, Pid} ->
{{ok, {logged_in, Pid}}, State};
Why ->
{{error, {unable_to_login, Why}}, State}
end;
Why ->
{{error, {user_or_password_invalid, Why}}, State}
end;
handle({'EXIT', _, _}, State) ->
State;
handle(Cmd, State) ->
%% standard command, to find transmission errors
{{error, {unknown_command, Cmd}}, State}.
|
