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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(couch_external_server).
-behaviour(gen_server).
-export([start_link/2, stop/1, execute/2]).
-export([init/1, terminate/2, handle_call/3, handle_cast/2, handle_info/2, code_change/3]).
-include("couch_db.hrl").
% External API
start_link(Name, Command) ->
gen_server:start_link(couch_external_server, [Name, Command], []).
stop(Pid) ->
gen_server:cast(Pid, stop).
execute(Pid, JsonReq) ->
gen_server:call(Pid, {execute, JsonReq}, infinity).
% Gen Server Handlers
init([Name, Command]) ->
?LOG_INFO("EXTERNAL: Starting process for: ~s", [Name]),
?LOG_INFO("COMMAND: ~s", [Command]),
process_flag(trap_exit, true),
Timeout = list_to_integer(couch_config:get("couchdb", "os_process_timeout",
"5000")),
{ok, Pid} = couch_os_process:start_link(Command, [{timeout, Timeout}]),
couch_config:register(fun("couchdb", "os_process_timeout", NewTimeout) ->
couch_os_process:set_timeout(Pid, list_to_integer(NewTimeout))
end),
{ok, {Name, Command, Pid}}.
terminate(_Reason, {_Name, _Command, Pid}) ->
couch_os_process:stop(Pid),
ok.
handle_call({execute, JsonReq}, _From, {Name, Command, Pid}) ->
{reply, couch_os_process:prompt(Pid, JsonReq), {Name, Command, Pid}}.
handle_info({'EXIT', _Pid, normal}, State) ->
{noreply, State};
handle_info({'EXIT', Pid, Reason}, {Name, Command, Pid}) ->
?LOG_INFO("EXTERNAL: Process for ~s exiting. (reason: ~w)", [Name, Reason]),
{stop, Reason, {Name, Command, Pid}}.
handle_cast(stop, {Name, Command, Pid}) ->
?LOG_INFO("EXTERNAL: Shutting down ~s", [Name]),
exit(Pid, normal),
{stop, normal, {Name, Command, Pid}};
handle_cast(_Whatever, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
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