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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/8]).
-export([init/1, terminate/2, handle_call/3, handle_cast/2, handle_info/2, code_change/3]).
-define(TIMEOUT, 5000).
-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, Db, Verb, Path, Query, Body, Post, Cookie) ->
gen_server:call(Pid, {execute, Db, Verb, Path, Query, Body, Post, Cookie}).
% Gen Server Handlers
init([Name, Command]) ->
?LOG_INFO("Starting process for: ~s", [Name]),
{ok, Pid} = couch_os_process:start_link(Command),
{ok, {Name, Command, Pid}}.
terminate(_Reason, {Name, _Command, Pid}) ->
?LOG_INFO("External Process Terminating: ~p: ~p", [Name, Pid]),
couch_os_process:stop(Pid),
ok.
handle_call({execute, Db, Verb, Path, Query, Body, Post, Cookie}, _From, {Name, Command, Pid}) ->
?LOG_DEBUG("Query Params ~p",[Query]),
{ok, Info} = couch_db:get_db_info(Db),
Json = {[
{<<"info">>, {Info}},
{<<"verb">>, Verb},
{<<"path">>, Path},
{<<"query">>, to_json_terms(Query)},
{<<"body">>, Body},
{<<"form">>, to_json_terms(Post)},
{<<"cookie">>, to_json_terms(Cookie)}]},
{reply, couch_os_process:prompt(Pid, Json), {Name, Command, Pid}}.
handle_info({'EXIT', Pid, Reason}, {Name, Command, Pid}) ->
?LOG_INFO("EXTERNAL: Restarting process for ~s (reason: ~w)", [Name, Reason]),
{ok, Pid} = couch_os_process:start_link(Command),
{noreply, {Name, Command, Pid}}.
handle_cast(stop, State) ->
{stop, normal, State};
handle_cast(_Whatever, State) ->
{noreply, State}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
% Internal API
to_json_terms(Data) ->
to_json_terms(Data, []).
to_json_terms([], Acc) ->
{lists:reverse(Acc)};
to_json_terms([{Key, Value} | Rest], Acc) ->
to_json_terms(Rest, [{list_to_binary(Key), list_to_binary(Value)} | Acc]).
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