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mod_http_upload_quota: Avoid 'max_days' race

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Try to spread clean-up runs for multiple hosts, rather than scheduling
them in parallel.  This should reduce I/O spikes, and avoid race
conditions where multiple processes detect and then try to delete the
same old files (if multiple hosts have the same 'docroot').

Fixes #3497.
This commit is contained in:
Holger Weiss 2021-09-05 20:00:05 +02:00
parent caf07692db
commit 868387a405
1 changed files with 11 additions and 12 deletions
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19
src/mod_http_upload_quota.erl
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@ -27,7 +27,6 @@
-author('holger@zedat.fu-berlin.de').
-define(TIMEOUT, timer:hours(24)).
-define(INITIAL_TIMEOUT, timer:minutes(10)).
-define(FORMAT(Error), file:format_error(Error)).
-behaviour(gen_server).
@ -64,7 +63,7 @@
max_days :: pos_integer() | infinity,
docroot :: binary(),
disk_usage = #{} :: disk_usage(),
timers :: [timer:tref()]}).
timer :: reference() | undefined}).
-type disk_usage() :: #{{binary(), binary()} => non_neg_integer()}.
-type state() :: #state{}.
@ -166,11 +165,10 @@ init([ServerHost|_]) ->
DocRoot1 = mod_http_upload_opt:docroot(ServerHost),
DocRoot2 = mod_http_upload:expand_home(str:strip(DocRoot1, right, $/)),
DocRoot3 = mod_http_upload:expand_host(DocRoot2, ServerHost),
Timers = if MaxDays == infinity -> [];
Timer = if MaxDays == infinity -> undefined;
true ->
{ok, T1} = timer:send_after(?INITIAL_TIMEOUT, sweep),
{ok, T2} = timer:send_interval(?TIMEOUT, sweep),
[T1, T2]
Timeout = p1_rand:uniform(?TIMEOUT div 2),
erlang:send_after(Timeout, self(), sweep)
end,
ejabberd_hooks:add(http_upload_slot_request, ServerHost, ?MODULE,
handle_slot_request, 50),
@ -179,7 +177,7 @@ init([ServerHost|_]) ->
access_hard_quota = AccessHardQuota,
max_days = MaxDays,
docroot = DocRoot3,
timers = Timers}}.
timer = Timer}}.
-spec handle_call(_, {pid(), _}, state()) -> {noreply, state()}.
handle_call(Request, From, State) ->
@ -249,6 +247,7 @@ handle_info(sweep, #state{server_host = ServerHost,
max_days = MaxDays} = State)
when is_integer(MaxDays), MaxDays > 0 ->
?DEBUG("Got 'sweep' message for ~ts", [ServerHost]),
Timer = erlang:send_after(?TIMEOUT, self(), sweep),
case file:list_dir(DocRoot) of
{ok, Entries} ->
BackThen = secs_since_epoch() - (MaxDays * 86400),
@ -264,17 +263,17 @@ handle_info(sweep, #state{server_host = ServerHost,
?ERROR_MSG("Cannot open document root ~ts: ~ts",
[DocRoot, ?FORMAT(Error)])
end,
{noreply, State};
{noreply, State#state{timer = Timer}};
handle_info(Info, State) ->
?ERROR_MSG("Unexpected info: ~p", [Info]),
{noreply, State}.
-spec terminate(normal | shutdown | {shutdown, _} | _, state()) -> ok.
terminate(Reason, #state{server_host = ServerHost, timers = Timers}) ->
terminate(Reason, #state{server_host = ServerHost, timer = Timer}) ->
?DEBUG("Stopping upload quota process for ~ts: ~p", [ServerHost, Reason]),
ejabberd_hooks:delete(http_upload_slot_request, ServerHost, ?MODULE,
handle_slot_request, 50),
lists:foreach(fun timer:cancel/1, Timers).
misc:cancel_timer(Timer).
-spec code_change({down, _} | _, state(), _) -> {ok, state()}.
code_change(_OldVsn, #state{server_host = ServerHost} = State, _Extra) ->