| % 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_config_listener). |
| -behaviour(gen_server). |
| -behaviour(config_listener). |
| |
| % public interface |
| -export([start_link/0]). |
| |
| % gen_server callbacks |
| -export([init/1, handle_call/3, handle_cast/2, handle_info/2, |
| code_change/3, terminate/2]). |
| |
| % config_listener callback |
| -export([handle_config_change/5]). |
| |
| start_link() -> |
| gen_server:start_link({local, ?MODULE}, ?MODULE, [], []). |
| |
| init([]) -> |
| 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")} |
| ], |
| ok = config:listen_for_changes(?MODULE, Settings), |
| {ok, Settings}. |
| |
| 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_call(_, _, State) -> |
| {reply, ignored, State}. |
| |
| handle_cast(_, State) -> |
| {noreply, State}. |
| |
| handle_info({gen_event_EXIT, {config_listener, ?MODULE}, _Reason}, State) -> |
| erlang:send_after(5000, self(), restart_config_listener), |
| {noreply, State}; |
| handle_info(restart_config_listener, State) -> |
| ok = config:listen_for_changes(?MODULE, State), |
| {noreply, State}; |
| handle_info(_Msg, State) -> |
| {noreply, State}. |
| |
| terminate(_, _State) -> |
| ok. |
| |
| code_change(_, State, _) -> |
| {ok, State}. |
| |
| % private |
| maybe_replace(Key, Value, Settings) -> |
| case couch_util:get_value(Key, Settings) of |
| Value -> |
| {ok, Settings}; |
| _ -> |
| chttpd:stop(), |
| {ok, lists:keyreplace(Key, 1, {Key, Value}, Settings)} |
| end. |