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Add mod_push_keepalive

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This module tries to keep pending stream management sessions of push
clients alive (as long as the disconnected clients are reachable via
push notifications).
This commit is contained in:
Holger Weiss 2017-07-21 01:07:36 +02:00
parent d6f1d3df5b
commit 66510c1d78
6 changed files with 290 additions and 13 deletions
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1
ejabberd.yml.example
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@ -726,6 +726,7 @@ modules:
- "hometree"
- "pep" # pep requires mod_caps
mod_push: {}
mod_push_keepalive: {}
## mod_register:
##
## Protect In-Band account registrations with CAPTCHA.

8
src/mod_push.erl
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@ -43,6 +43,9 @@
%% ejabberd command.
-export([get_commands_spec/0, delete_old_sessions/1]).
%% API (used by mod_push_keepalive).
-export([notify/1, notify/3, notify/5]).
-include("ejabberd.hrl").
-include("ejabberd_commands.hrl").
-include("logger.hrl").
@ -393,7 +396,7 @@ remove_user(LUser, LServer) ->
delete_sessions(LUser, LServer, LookupFun, Mod).
%%--------------------------------------------------------------------
%% Internal functions.
%% Generate push notifications.
%%--------------------------------------------------------------------
-spec notify(c2s_state()) -> ok.
notify(#{jid := #jid{luser = LUser, lserver = LServer}, sid := {TS, _}}) ->
@ -433,6 +436,9 @@ notify(LServer, PushLJID, Node, XData, HandleResponse) ->
ejabberd_local:route_iq(IQ, HandleResponse),
ok.
%%--------------------------------------------------------------------
%% Internal functions.
%%--------------------------------------------------------------------
-spec store_session(binary(), binary(), timestamp(), jid(), binary(), xdata())
-> {ok, push_session()} | error.
store_session(LUser, LServer, TS, PushJID, Node, XData) ->

236
src/mod_push_keepalive.erl Normal file
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@ -0,0 +1,236 @@
%%%----------------------------------------------------------------------
%%% File : mod_push_keepalive.erl
%%% Author : Holger Weiss <holger@zedat.fu-berlin.de>
%%% Purpose : Keep pending XEP-0198 sessions alive with XEP-0357
%%% Created : 15 Jul 2017 by Holger Weiss <holger@zedat.fu-berlin.de>
%%%
%%%
%%% ejabberd, Copyright (C) 2017 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License along
%%% with this program; if not, write to the Free Software Foundation, Inc.,
%%% 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
%%%
%%%----------------------------------------------------------------------
-module(mod_push_keepalive).
-author('holger@zedat.fu-berlin.de').
-behavior(gen_mod).
%% gen_mod callbacks.
-export([start/2, stop/1, reload/3, mod_opt_type/1, depends/2]).
%% ejabberd_hooks callbacks.
-export([c2s_session_pending/1, c2s_session_resumed/1, c2s_copy_session/2,
c2s_handle_cast/2, c2s_handle_info/2, c2s_stanza/3]).
-include("logger.hrl").
-include("xmpp.hrl").
-define(PUSH_BEFORE_TIMEOUT_SECS, 120).
-type c2s_state() :: ejabberd_c2s:state().
%%--------------------------------------------------------------------
%% gen_mod callbacks.
%%--------------------------------------------------------------------
-spec start(binary(), gen_mod:opts()) -> ok.
start(Host, Opts) ->
case gen_mod:get_opt(wake_on_start, Opts, false) of
true ->
wake_all(Host);
false ->
ok
end,
register_hooks(Host).
-spec stop(binary()) -> ok.
stop(Host) ->
unregister_hooks(Host).
-spec reload(binary(), gen_mod:opts(), gen_mod:opts()) -> ok.
reload(Host, NewOpts, OldOpts) ->
case gen_mod:is_equal_opt(wake_on_start, NewOpts, OldOpts, false) of
{false, true, _} ->
wake_all(Host);
_ ->
ok
end,
ok.
-spec depends(binary(), gen_mod:opts()) -> [{module(), hard | soft}].
depends(_Host, _Opts) ->
[{mod_push, hard},
{mod_client_state, soft},
{mod_stream_mgmt, soft}].
-spec mod_opt_type(atom()) -> fun((term()) -> term()) | [atom()].
mod_opt_type(resume_timeout) ->
fun(I) when is_integer(I), I >= 0 -> I;
(undefined) -> undefined
end;
mod_opt_type(wake_on_start) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(wake_on_timeout) ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(O) when O == cache_life_time; O == cache_size ->
fun(I) when is_integer(I), I > 0 -> I;
(infinity) -> infinity
end;
mod_opt_type(O) when O == use_cache; O == cache_missed ->
fun (B) when is_boolean(B) -> B end;
mod_opt_type(_) ->
[resume_timeout, wake_on_start, wake_on_timeout, db_type, cache_life_time,
cache_size, use_cache, cache_missed, iqdisc].
%%--------------------------------------------------------------------
%% Register/unregister hooks.
%%--------------------------------------------------------------------
-spec register_hooks(binary()) -> ok.
register_hooks(Host) ->
ejabberd_hooks:add(c2s_session_pending, Host, ?MODULE,
c2s_session_pending, 50),
ejabberd_hooks:add(c2s_session_resumed, Host, ?MODULE,
c2s_session_resumed, 50),
ejabberd_hooks:add(c2s_copy_session, Host, ?MODULE,
c2s_copy_session, 50),
ejabberd_hooks:add(c2s_handle_cast, Host, ?MODULE,
c2s_handle_cast, 40),
ejabberd_hooks:add(c2s_handle_info, Host, ?MODULE,
c2s_handle_info, 50),
ejabberd_hooks:add(c2s_handle_send, Host, ?MODULE,
c2s_stanza, 50).
-spec unregister_hooks(binary()) -> ok.
unregister_hooks(Host) ->
ejabberd_hooks:delete(disco_sm_features, Host, ?MODULE,
disco_sm_features, 50),
ejabberd_hooks:delete(c2s_session_pending, Host, ?MODULE,
c2s_session_pending, 50),
ejabberd_hooks:delete(c2s_session_resumed, Host, ?MODULE,
c2s_session_resumed, 50),
ejabberd_hooks:delete(c2s_copy_session, Host, ?MODULE,
c2s_copy_session, 50),
ejabberd_hooks:delete(c2s_handle_cast, Host, ?MODULE,
c2s_handle_cast, 40),
ejabberd_hooks:delete(c2s_handle_info, Host, ?MODULE,
c2s_handle_info, 50),
ejabberd_hooks:delete(c2s_handle_send, Host, ?MODULE,
c2s_stanza, 50).
%%--------------------------------------------------------------------
%% Hook callbacks.
%%--------------------------------------------------------------------
-spec c2s_stanza(c2s_state(), xmpp_element() | xmlel(), term()) -> c2s_state().
c2s_stanza(#{push_enabled := true, mgmt_state := pending} = State,
_Pkt, _SendResult) ->
maybe_restore_resume_timeout(State);
c2s_stanza(State, _Pkt, _SendResult) ->
State.
-spec c2s_session_pending(c2s_state()) -> c2s_state().
c2s_session_pending(#{push_enabled := true, mgmt_queue := Queue} = State) ->
case p1_queue:len(Queue) of
0 ->
State1 = maybe_adjust_resume_timeout(State),
maybe_start_wakeup_timer(State1);
_ ->
State
end;
c2s_session_pending(State) ->
State.
-spec c2s_session_resumed(c2s_state()) -> c2s_state().
c2s_session_resumed(#{push_enabled := true} = State) ->
maybe_restore_resume_timeout(State);
c2s_session_resumed(State) ->
State.
-spec c2s_copy_session(c2s_state(), c2s_state()) -> c2s_state().
c2s_copy_session(State, #{push_enabled := true,
push_resume_timeout := ResumeTimeout,
push_wake_on_timeout := WakeOnTimeout}) ->
State#{push_resume_timeout => ResumeTimeout,
push_wake_on_timeout => WakeOnTimeout};
c2s_copy_session(State, _) ->
State.
-spec c2s_handle_cast(c2s_state(), any()) -> c2s_state().
c2s_handle_cast(#{lserver := LServer} = State, push_enable) ->
ResumeTimeout = gen_mod:get_module_opt(LServer, ?MODULE,
resume_timeout, 86400),
WakeOnTimeout = gen_mod:get_module_opt(LServer, ?MODULE,
wake_on_timeout, true),
State#{push_resume_timeout => ResumeTimeout,
push_wake_on_timeout => WakeOnTimeout};
c2s_handle_cast(State, push_disable) ->
State1 = maps:remove(push_resume_timeout, State),
maps:remove(push_wake_on_timeout, State1);
c2s_handle_cast(State, _Msg) ->
State.
-spec c2s_handle_info(c2s_state(), any()) -> c2s_state() | {stop, c2s_state()}.
c2s_handle_info(#{push_enabled := true, mgmt_state := pending,
jid := JID} = State, {timeout, _, push_keepalive}) ->
?INFO_MSG("Waking ~s before session times out", [jid:encode(JID)]),
mod_push:notify(State),
{stop, State};
c2s_handle_info(State, _) ->
State.
%%--------------------------------------------------------------------
%% Internal functions.
%%--------------------------------------------------------------------
-spec maybe_adjust_resume_timeout(c2s_state()) -> c2s_state().
maybe_adjust_resume_timeout(#{push_resume_timeout := undefined} = State) ->
State;
maybe_adjust_resume_timeout(#{push_resume_timeout := Timeout} = State) ->
OrigTimeout = mod_stream_mgmt:get_resume_timeout(State),
?DEBUG("Adjusting resume timeout to ~B seconds", [Timeout]),
State1 = mod_stream_mgmt:set_resume_timeout(State, Timeout),
State1#{push_resume_timeout_orig => OrigTimeout}.
-spec maybe_restore_resume_timeout(c2s_state()) -> c2s_state().
maybe_restore_resume_timeout(#{push_resume_timeout_orig := Timeout} = State) ->
?DEBUG("Restoring resume timeout to ~B seconds", [Timeout]),
State1 = mod_stream_mgmt:set_resume_timeout(State, Timeout),
maps:remove(push_resume_timeout_orig, State1);
maybe_restore_resume_timeout(State) ->
State.
-spec maybe_start_wakeup_timer(c2s_state()) -> c2s_state().
maybe_start_wakeup_timer(#{push_wake_on_timeout := true,
push_resume_timeout := ResumeTimeout} = State)
when is_integer(ResumeTimeout), ResumeTimeout > ?PUSH_BEFORE_TIMEOUT_SECS ->
WakeTimeout = ResumeTimeout - ?PUSH_BEFORE_TIMEOUT_SECS,
?DEBUG("Scheduling wake-up timer to fire in ~B seconds", [WakeTimeout]),
erlang:start_timer(timer:seconds(WakeTimeout), self(), push_keepalive),
State;
maybe_start_wakeup_timer(State) ->
State.
-spec wake_all(binary()) -> ok | error.
wake_all(LServer) ->
?INFO_MSG("Waking all push clients on ~s", [LServer]),
Mod = gen_mod:db_mod(LServer, mod_push),
case Mod:lookup_sessions(LServer) of
{ok, Sessions} ->
IgnoreResponse = fun(_) -> ok end,
lists:foreach(fun({_, PushLJID, Node, XData}) ->
mod_push:notify(LServer, PushLJID, Node,
XData, IgnoreResponse)
end, Sessions);
error ->
error
end.

54
src/mod_stream_mgmt.erl
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@ -33,6 +33,8 @@
c2s_unbinded_packet/2, c2s_closed/2, c2s_terminated/2,
c2s_handle_send/3, c2s_handle_info/2, c2s_handle_call/3,
c2s_handle_recv/3]).
%% adjust pending session timeout
-export([get_resume_timeout/1, set_resume_timeout/2]).
-include("xmpp.hrl").
-include("logger.hrl").
@ -235,8 +237,9 @@ c2s_handle_info(#{mgmt_ack_timer := TRef, jid := JID, mod := Mod} = State,
[jid:encode(JID)]),
State1 = Mod:close(State),
{stop, transition_to_pending(State1)};
c2s_handle_info(#{mgmt_state := pending, jid := JID, mod := Mod} = State,
{timeout, _, pending_timeout}) ->
c2s_handle_info(#{mgmt_state := pending,
mgmt_pending_timer := TRef, jid := JID, mod := Mod} = State,
{timeout, TRef, pending_timeout}) ->
?DEBUG("Timed out waiting for resumption of stream for ~s",
[jid:encode(JID)]),
Mod:stop(State#{mgmt_state => timeout});
@ -282,6 +285,20 @@ c2s_terminated(#{mgmt_state := MgmtState, mgmt_stanzas_in := In, sid := SID,
c2s_terminated(State, _Reason) ->
State.
%%%===================================================================
%%% Adjust pending session timeout
%%%===================================================================
-spec get_resume_timeout(state()) -> non_neg_integer().
get_resume_timeout(#{mgmt_timeout := Timeout}) ->
Timeout.
-spec set_resume_timeout(state(), non_neg_integer()) -> state().
set_resume_timeout(#{mgmt_timeout := Timeout} = State, Timeout) ->
State;
set_resume_timeout(State, Timeout) ->
State1 = restart_pending_timer(State, Timeout),
State1#{mgmt_timeout => Timeout}.
%%%===================================================================
%%% Internal functions
%%%===================================================================
@ -408,8 +425,8 @@ transition_to_pending(#{mgmt_state := active, jid := JID,
lserver := LServer, mgmt_timeout := Timeout} = State) ->
State1 = cancel_ack_timer(State),
?INFO_MSG("Waiting for resumption of stream for ~s", [jid:encode(JID)]),
erlang:start_timer(timer:seconds(Timeout), self(), pending_timeout),
State2 = State1#{mgmt_state => pending},
TRef = erlang:start_timer(timer:seconds(Timeout), self(), pending_timeout),
State2 = State1#{mgmt_state => pending, mgmt_pending_timer => TRef},
ejabberd_hooks:run_fold(c2s_session_pending, LServer, State2, []);
transition_to_pending(State) ->
State.
@ -648,20 +665,33 @@ add_resent_delay_info(_State, El, _Time) ->
send(#{mod := Mod} = State, Pkt) ->
Mod:send(State, Pkt).
-spec restart_pending_timer(state(), non_neg_integer()) -> state().
restart_pending_timer(#{mgmt_pending_timer := TRef} = State, NewTimeout) ->
cancel_timer(TRef),
NewTRef = erlang:start_timer(timer:seconds(NewTimeout), self(),
pending_timeout),
State#{mgmt_pending_timer => NewTRef};
restart_pending_timer(State, _NewTimeout) ->
State.
-spec cancel_ack_timer(state()) -> state().
cancel_ack_timer(#{mgmt_ack_timer := TRef} = State) ->
case erlang:cancel_timer(TRef) of
false ->
receive {timeout, TRef, _} -> ok
after 0 -> ok
end;
_ ->
ok
end,
cancel_timer(TRef),
maps:remove(mgmt_ack_timer, State);
cancel_ack_timer(State) ->
State.
-spec cancel_timer(reference()) -> ok.
cancel_timer(TRef) ->
case erlang:cancel_timer(TRef) of
false ->
receive {timeout, TRef, _} -> ok
after 0 -> ok
end;
_ ->
ok
end.
-spec bounce_message_queue() -> ok.
bounce_message_queue() ->
receive {route, Pkt} ->

2
test/ejabberd_SUITE_data/ejabberd.yml
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@ -232,6 +232,7 @@ Welcome to this XMPP server."
mod_ping: []
mod_proxy65: []
mod_push: []
mod_push_keepalive: []
mod_s2s_dialback: []
mod_stream_mgmt:
resume_timeout: 3
@ -294,6 +295,7 @@ Welcome to this XMPP server."
mod_ping: []
mod_proxy65: []
mod_push: []
mod_push_keepalive: []
mod_s2s_dialback: []
mod_stream_mgmt:
resume_timeout: 3

2
test/push_tests.erl
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@ -77,6 +77,8 @@ master_slave_cases() ->
sm_master(Config) ->
ct:comment("Waiting for the slave to close the socket"),
peer_down = get_event(Config),
ct:comment("Waiting a bit in order to test the keepalive feature"),
ct:sleep(5000), % Without mod_push_keepalive, the session would time out.
ct:comment("Sending message to the slave"),
send_test_message(Config),
ct:comment("Handling push notification"),