| % 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/0]). |
| |
| -export([handle_config_change/5, handle_config_terminate/3]). |
| |
| -include_lib("kernel/include/logger.hrl"). |
| |
| %% Helper macro for declaring children of supervisor |
| -define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 100, Type, [I]}). |
| -define(DEFAULT_BACKLOG, 512). |
| -define(DEFAULT_SERVER_OPTIONS, "[{recbuf, undefined}]"). |
| |
| start_link() -> |
| Arg = case fabric2_node_types:is_type(api_frontend) of |
| true -> normal; |
| false -> disabled |
| end, |
| supervisor:start_link({local,?MODULE}, ?MODULE, Arg). |
| |
| init(disabled) -> |
| ?LOG_NOTICE(#{what => http_api_disabled}), |
| couch_log:notice("~p : api_frontend disabled", [?MODULE]), |
| {ok, {{one_for_one, 3, 10}, []}}; |
| |
| init(normal) -> |
| 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_integer("chttpd", "backlog", ?DEFAULT_BACKLOG)}, |
| {server_options, config:get("chttpd", |
| "server_options", ?DEFAULT_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() -> |
| lists:foldl(fun append_if_set/2, [], [ |
| {max_objects, config:get_integer("chttpd_auth_cache", "max_objects", 0)}, |
| {max_size, config:get_integer("chttpd_auth_cache", "max_size", 104857600)}, |
| {max_lifetime, config:get_integer("chttpd_auth_cache", "max_lifetime", 600000)} |
| ]). |
| |
| append_if_set({Key, Value}, Opts) when Value > 0 -> |
| [{Key, Value} | Opts]; |
| append_if_set({_Key, 0}, Opts) -> |
| Opts; |
| append_if_set({Key, Value}, Opts) -> |
| ?LOG_ERROR(#{ |
| what => invalid_config_setting, |
| section => chttpd_auth_cache, |
| key => Key, |
| value => Value, |
| details => "value must be a non-negative integer" |
| }), |
| couch_log:error( |
| "The value for `~s` should be string convertable " |
| "to integer which is >= 0 (got `~p`)", [Key, Value]), |
| Opts. |