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%% Copyright (c) 2012, Magnus Klaar <klaar@ninenines.eu>
%%
%% Permission to use, copy, modify, and/or distribute this software for any
%% purpose with or without fee is hereby granted, provided that the above
%% copyright notice and this permission notice appear in all copies.
%%
%% THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
%% WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
%% MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
%% ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
%% WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
%% ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
%% OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
%% @doc Runtime context for events.
-module(gr_context).
-export([
make/1
]).
make(Options) ->
make_(undefined, undefined, undefined, undefined, Options).
make_(_Node, App, Pid, Time, [{'$n', Node}|T]) ->
make_(Node, App, Pid, Time, T);
make_(Node, _App, Pid, Time, [{'$a', App}|T]) ->
make_(Node, App, Pid, Time, T);
make_(Node, App, _Pid, Time, [{'$p', Pid}|T]) ->
make_(Node, App, Pid, Time, T);
make_(Node, App, Pid, _Time, [{'$t', Time}|T]) ->
make_(Node, App, Pid, Time, T);
make_(Node, App, Pid, Time, []) ->
Pid2 = case Pid of undefined -> self(); _ -> Pid end,
Node2 = case Node of undefined -> node(Pid2); _ -> Node end,
App2 = case App of undefined -> application(Pid2); _ -> App end,
Time2 = case Time of undefined -> os:timestamp(); _ -> Time end,
{Node2, App2, Pid2, Time2}.
application(Pid) when Pid =:= self() ->
case application:get_application(group_leader()) of
{ok, App} -> App;
undefined -> undefined
end;
application(Pid) ->
{_, GroupLeader} = erlang:process_info(Pid, group_leader),
case application:get_application(GroupLeader) of
{ok, App} -> App;
undefined -> undefined
end.
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
make_defaults_test() ->
{Node, App, Pid, Time} = gr_context:make([]),
?assertEqual(Node, node()),
?assertEqual(Pid, self()),
?assert(is_atom(App)),
?assertMatch({_,_,_}, Time).
make_override_test() ->
Pid = spawn(fun() -> ok end),
{Node, App, Pid, Time} = gr_context:make([
{'$n', nodename}, {'$a', appname}, {'$p', Pid}, {'$t', timeval}]),
?assertEqual(nodename, Node),
?assertEqual(appname, App),
?assertEqual(timeval, Time).
-endif.
|
