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% Licensed under the Apache License, Version 2.0 (the "License"); you may not
% use this file except in compliance with the License. You may obtain a copy of
% the License at
%
% http://www.apache.org/licenses/LICENSE-2.0
%
% Unless required by applicable law or agreed to in writing, software
% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
% License for the specific language governing permissions and limitations under
% the License.
-module(chttpd_sup).
-behaviour(supervisor).
-vsn(1).
-behaviour(config_listener).
-export([init/1]).
-export([start_link/1]).
-export([handle_config_change/5, handle_config_terminate/3]).
%% Helper macro for declaring children of supervisor
-define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 100, Type, [I]}).
start_link(Args) ->
supervisor:start_link({local,?MODULE}, ?MODULE, Args).
init([]) ->
Children = [
{
config_listener_mon,
{config_listener_mon, start_link, [?MODULE, settings()]},
permanent,
5000,
worker,
[config_listener_mon]
},
?CHILD(chttpd, worker),
?CHILD(chttpd_auth_cache, worker),
{chttpd_auth_cache_lru,
{ets_lru, start_link, [chttpd_auth_cache_lru, lru_opts()]},
permanent, 5000, worker, [ets_lru]}
],
{ok, {{one_for_one, 3, 10},
couch_epi:register_service(chttpd_epi, Children)}}.
handle_config_change("chttpd", "bind_address", Value, _, Settings) ->
maybe_replace(bind_address, Value, Settings);
handle_config_change("chttpd", "port", Value, _, Settings) ->
maybe_replace(port, Value, Settings);
handle_config_change("chttpd", "backlog", Value, _, Settings) ->
maybe_replace(backlog, Value, Settings);
handle_config_change("chttpd", "server_options", Value, _, Settings) ->
maybe_replace(server_options, Value, Settings);
handle_config_change(_, _, _, _, Settings) ->
{ok, Settings}.
handle_config_terminate(_Server, _Reason, _State) ->
ok.
settings() ->
[
{bind_address, config:get("chttpd", "bind_address")},
{port, config:get("chttpd", "port")},
{backlog, config:get("chttpd", "backlog")},
{server_options, config:get("chttpd", "server_options")}
].
maybe_replace(Key, Value, Settings) ->
case couch_util:get_value(Key, Settings) of
Value ->
{ok, Settings};
_ ->
chttpd:stop(),
{ok, lists:keyreplace(Key, 1, Settings, {Key, Value})}
end.
lru_opts() ->
case config:get("chttpd_auth_cache", "max_objects") of
MxObjs when is_integer(MxObjs), MxObjs > 0 ->
[{max_objects, MxObjs}];
_ ->
[]
end ++
case config:get("chttpd_auth_cache", "max_size", "104857600") of
MxSize when is_integer(MxSize), MxSize > 0 ->
[{max_size, MxSize}];
_ ->
[]
end ++
case config:get("chttpd_auth_cache", "max_lifetime", "600000") of
MxLT when is_integer(MxLT), MxLT > 0 ->
[{max_lifetime, MxLT}];
_ ->
[]
end.
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