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twitterl.erl
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twitterl.erl
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%%%-------------------------------------------------------------------
%%% File : twitterl.erl
%%% Author : Yomi (baphled boodah) Akindayini <yomi@boodah.net>
%%% Description : Gen server used to interact with twitter
%%%
%%% Created : 2 Dec 2008 by Yomi (baphled boodah) Akindayini <yomi@boodah.net>
%%%-------------------------------------------------------------------
-module(twitterl).
-behaviour(gen_server).
-import(twitterl_interface).
%% API
-export([start/0,call/2,call/3,add_session/2,remove_session/1]).
%% Wrapper methods, exposed to show commands useable with call
-export([find_trends/3,find_tweets/3,find_term/3,tweet_timeline/3,my_timeline/3]).
%Status based methods
-export([status_show/3]).
%User based methods
-export([user_show/3,user_followers/3,user_friends/3,user_timeline/3,public_timeline/3]).
%-compile(export_all).
%% gen_server callbacks
-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
terminate/2, code_change/3]).
-record(twitterl, {sessions, delay, lastcall}).
start() ->
inets:start(),
gen_server:start_link({global, ?MODULE}, ?MODULE, [], []).
init(_) ->
{ok, #twitterl{
sessions = gb_trees:empty(),
delay = 0,
lastcall = calendar:datetime_to_gregorian_seconds(erlang:universaltime())}}.
handle_cast(_Msg, State) ->
{noreply, State}.
handle_info(_Info, State) ->
{noreply, State}.
add_session(Login, Password) ->
gen_server:call({global, ?MODULE}, {add_session, Login, Password}, infinity).
remove_session(Login) ->
gen_server:call({global, ?MODULE}, {remove_session, Login}, infinity).
call(Client,Method) ->
twitterl:call(Client, Method, []).
call(Client, Method, Args) ->
gen_server:call({global, ?MODULE}, {Client, Method, Args}, infinity).
handle_call({add_session, Login, Password}, _From, State) ->
NewTree = case gb_trees:is_defined(Login, State#twitterl.sessions) of
true ->
Result = "Already have a session",
State#twitterl.sessions;
false ->
Result = "Created session",
gb_trees:insert(Login, {Login, Password}, State#twitterl.sessions)
end,
{reply, Result, State#twitterl{ sessions = NewTree }};
handle_call({remove_session, Login}, _From, State) ->
NewTree = case gb_trees:is_defined(Login, State#twitterl.sessions) of
true ->
Result = "Session dropped",
gb_trees:delete(Login, State#twitterl.sessions);
false ->
Result = "Unable to drop session.",
State#twitterl.sessions
end,
{reply, Result, State#twitterl{ sessions = NewTree }};
%%%
%%% catches all our call calls, sets the time and tried to execute the call.
handle_call({Client, Method, Args}, _From, State) ->
Now = calendar:datetime_to_gregorian_seconds(erlang:universaltime()),
Response = case session_from_client(State, Client) of
{error, Reason} -> {error, Reason};
{Login, Password} ->
try apply(twitterl, Method, [Login, Password, Args])
catch
Err:Msg ->
io:format("~p:~p~n", [Err, Msg]),
{error, {Method, Args}}
end;
_ -> {error, unknown}
end,
{reply, Response, State#twitterl{ lastcall = Now }};
handle_call(_, _From, State) -> {noreply, ok, State}.
terminate(_Reason, State) ->
io:format("Shutting down...~n"),
{ok,State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
%%--------------------------------------------------------------------
%%% Internal functions
%%--------------------------------------------------------------------
%% private
session_from_client(State, Client) ->
case gb_trees:is_defined(Client, State#twitterl.sessions) of
false -> {error, {invalid_client, Client}};
true -> gb_trees:get(Client, State#twitterl.sessions)
end.
%% The following methods are used to retrieve RSS based data.
%Search based methods
find_trends(_Login, _Password, _Args) ->
twitterl_interface:trends().
find_tweets(Login, _Password, Args) ->
twitterl_interface:tweets(Args,Login).
find_term(_Login, _Password, Args) ->
twitterl_interface:term(Args).
% Used to retrieve basic tweet information
tweet_timeline(_Login, _Password, _Args) ->
twitterl_interface:public_timeline().
my_timeline(Login, _Password, _Args) ->
twitterl_interface:user_timeline(Login).
%% These methods will return more detailed information
%% including who is friends with who & retrieving conversations.
user_followers(Login, Password, _Args) ->
twitterl_interface:handle_user(user_followers, Login, Password,nil).
user_friends(Login, Password, _Args) ->
twitterl_interface:handle_user(user_friends, Login, Password, nil).
user_show(Login, Password, Args) ->
twitterl_interface:handle_user(user_show, Login, Password, Args).
public_timeline(Login, Password, _Args) ->
twitterl_interface:handle_status(public_timeline, Login, Password, nil).
user_timeline(Login, Password, _Args) ->
twitterl_interface:handle_status(user_timeline, Login, Password, nil).
status_show(Login, Password, Args) ->
twitterl_interface:handle_status(status_show, Login, Password, Args).