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%%% Copyright (c) 2017, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(statusreport).
-behaviour(gen_server).
-export([start_link/0]).
-export([init/1, handle_call/3, terminate/2, handle_cast/2, handle_info/2,
code_change/3]).
-export([report/4]).
-export([report_multi/4]).
-record(state, {
timer :: none|reference(),
nodename :: string(),
statusreports :: dict:dict(),
lastsent :: integer()
}).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
process_flag(trap_exit, true),
ReportInterval = application:get_env(plop, status_report_interval, 1000),
lager:info("~p: starting", [?MODULE]),
HeartbeatInterval = application:get_env(plop, heartbeat_interval, 1000),
erlang:start_timer(HeartbeatInterval, self(), heartbeat),
{ok, #state{timer = none,
nodename = http_auth:own_name(),
statusreports = dict:new(),
lastsent = erlang:monotonic_time(millisecond) - ReportInterval}}.
store_status(State, Service, Target, Variable, Status) ->
Statusreports = dict:store({Service, Target, Variable},
{single, Status},
State#state.statusreports),
State#state{statusreports = Statusreports}.
dict_append_set(Key, Value, Dict) ->
AppendSet = sets:from_list([Value]),
dict:update(Key, fun ({multi, Old}) ->
{multi, sets:union(Old, AppendSet)}
end,
{multi, AppendSet}, Dict).
store_multi_status(State, Service, Target, Variable, Status) ->
Statusreports = dict_append_set({Service, Target, Variable},
Status,
State#state.statusreports),
State#state{statusreports = Statusreports}.
store_set_status(State, Service, Target, Variable, Statuses) ->
Statusreports = dict:store({Service, Target, Variable},
{multi, Statuses},
State#state.statusreports),
State#state{statusreports = Statusreports}.
heartbeat(State) ->
{ok, ConfigVersion} = plopconfig:get_env(version),
RunningApps = [atom_to_list(App) ++ " " ++ Vsn || {App, _Desc, Vsn} <- application:which_applications()],
NewState1 = store_status(State, "heartbeat", "", "configversion", ConfigVersion),
NewState2 = store_set_status(NewState1, "heartbeat", "", "applications", sets:from_list(RunningApps)),
NewState2.
handle_call(_, _From, State) ->
{noreply, State}.
handle_cast({report, Service, Target, Variable, Status}, State) ->
NewState = store_status(State, Service, Target, Variable, Status),
{noreply, try_send(NewState)};
handle_cast({report_multi, Service, Target, Variable, Status}, State) ->
NewState = store_multi_status(State, Service, Target, Variable, Status),
{noreply, try_send(NewState)}.
handle_info({timeout, _Timer, force_send}, State) ->
lager:debug("statusreport timer timeout"),
{noreply, force_send(State)};
handle_info({timeout, _Timer, heartbeat}, State) ->
lager:debug("statusreport timer timeout"),
HeartbeatInterval = application:get_env(plop, heartbeat_interval, 1000),
erlang:start_timer(HeartbeatInterval, self(), heartbeat),
NewState = heartbeat(State),
{noreply, try_send(NewState)}.
code_change(_OldVsn, State, _Extra) ->
{ok, State}.
cancel_timer(State) ->
case State#state.timer of
none ->
none;
_ ->
erlang:cancel_timer(State#state.timer)
end,
State#state{timer = none}.
set_timer(State) ->
case State#state.timer of
none ->
ReportInterval = application:get_env(plop, status_report_interval, 1000),
Timer = erlang:start_timer(State#state.lastsent + ReportInterval, self(), force_send, [{abs, true}]),
State#state{timer = Timer};
_ ->
State
end.
terminate(Reason, State) ->
lager:info("~p terminating: ~p", [?MODULE, Reason]),
NewState = cancel_timer(State),
case Reason of
shutdown ->
force_send(NewState);
_ ->
none
end,
ok.
group_by_service(Statusreports) ->
dict:to_list(
lists:foldl(
fun ({{Service, Target, Variable}, Status}, Acc) ->
dict:append(Service, {Target, Variable, Status}, Acc)
end, dict:new(), dict:to_list(Statusreports))).
encode_one_status(Status) when is_number(Status) ->
Status;
encode_one_status(Status) when is_list(Status) ->
list_to_binary(Status);
encode_one_status(Status) when is_binary(Status) ->
Status;
encode_one_status(null) ->
null.
encode_status({single, Status}) ->
encode_one_status(Status);
encode_status({multi, Statuses}) ->
lists:map(fun encode_one_status/1, sets:to_list(Statuses)).
send(Service, Statusreports, Nodename) ->
lager:debug("reporting status to ~p: ~p", [Service, Statusreports]),
[NodeAddress] = plopconfig:get_env(statusservers, []),
DebugTag = "statusreport",
URL = NodeAddress ++ Service,
Headers = [{"Content-Type", "text/json"}],
RequestBody = list_to_binary(
mochijson2:encode(
[
{struct,
[{"target", list_to_binary(Target)},
{"source", list_to_binary(Nodename)},
{"key", list_to_binary(Variable)},
{"value", encode_status(Status)}]}
|| {Target, Variable, Status} <- Statusreports
])),
case plop_httputil:request(DebugTag, URL, Headers, RequestBody) of
{error, Err} ->
lager:debug("request error ~p ~p", [DebugTag, Err]);
{failure, {none, StatusCode, none}, _RespHeaders, _Body} ->
lager:debug("request failure ~p ~p", [DebugTag, StatusCode]);
{success, {_, StatusCode, _}, _, Body} when StatusCode == 200 ->
case (catch mochijson2:decode(Body)) of
{error, Err} ->
lager:debug("error returned ~p ~p", [DebugTag, Err]);
{struct, _PropList} ->
none
end
end.
force_send(State) ->
lists:foreach(fun ({Service, Statusreports}) ->
send(Service, Statusreports, State#state.nodename)
end, group_by_service(State#state.statusreports)),
NewState = cancel_timer(State),
NewState#state{statusreports = dict:new(), lastsent = erlang:monotonic_time(millisecond)}.
try_send(State) ->
ReportInterval = application:get_env(plop, status_report_interval, 1000),
NextSend = State#state.lastsent + ReportInterval,
Now = erlang:monotonic_time(millisecond),
if
NextSend > Now ->
lager:debug("status report sent ~p ms ago, setting timer", [NextSend - Now]),
set_timer(State);
true ->
lager:debug("status report send long enough ago"),
force_send(State)
end.
report(Service, Target, Variable, Status) when is_number(Status); is_list(Status); is_binary(Status); Status == null ->
lager:debug("reporting status ~p ~p ~p ~p", [Service, Target, Variable, Status]),
gen_server:cast(?MODULE, {report, Service, Target, Variable, Status}).
report_multi(Service, Target, Variable, Status) when is_number(Status); is_list(Status); is_binary(Status) ->
lager:debug("reporting multi status ~p ~p ~p ~p", [Service, Target, Variable, Status]),
gen_server:cast(?MODULE, {report_multi, Service, Target, Variable, Status}).
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