rebar_templates / webm_sup.erl

%% @author {{name}} {{email}}
%% @copyright YYYY {{name}}.

%% @doc Supervisor for the {{appid}} application.

-module({{appid}}_sup).
-behaviour(supervisor).

%% External exports
-export([start_link/0, upgrade/0]).

%% supervisor callbacks
-export([init/1]).

%% @spec start_link() -> ServerRet
%% @doc API for starting the supervisor.
start_link() ->
    supervisor:start_link({local, ?MODULE}, ?MODULE, []).

%% @spec upgrade() -> ok
%% @doc Add processes if necessary.
upgrade() ->
    {ok, {_, Specs}} = init([]),

    Old = sets:from_list([Name || {Name, _, _, _}
                                      <- supervisor:which_children(?MODULE)]),
    New = sets:from_list([Name || {Name, _, _, _, _, _} <- Specs]),
    Kill = sets:subtract(Old, New),

    sets:fold(fun (Id, ok) ->
                      supervisor:terminate_child(?MODULE, Id),
                      supervisor:delete_child(?MODULE, Id),
                      ok
              end, ok, Kill),

    [supervisor:start_child(?MODULE, Spec) || Spec <- Specs],
    ok.

%% @spec init([]) -> SupervisorTree
%% @doc supervisor callback.
init([]) ->
    Ip = case os:getenv("WEBMACHINE_IP") of false ->
                 "0.0.0.0";
             _Ip -> _Ip end,
    Port = case os:getenv("WEBMACHINE_PORT") of false -> 8000; _Port -> l2i(_Port) end,
    {ok, Dispatch} = file:consult(filename:join(
                                    [filename:dirname(code:which(?MODULE)),
                                     "..", "priv", "dispatch.conf"])),
    WebConfig = [
                 {ip, Ip},
                 {port, Port},
                 {log_dir, "priv/log"},
                 {dispatch, Dispatch}],
    Web = {webmachine_mochiweb,
           {webmachine_mochiweb, start, [WebConfig]},
           permanent, 5000, worker, dynamic},
    Processes = [Web],
    {ok, { { one_for_one, 10, 10}, Processes } }.

l2i(L) when is_list(L)    -> list_to_integer(L);
l2i(I) when is_integer(I) -> I.
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