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%%%-------------------------------------------------------------------
%%% Author  : Evgeny Khramtsov <ekhramtsov@process-one.net>
%%% Created : 16 Nov 2016 by Evgeny Khramtsov <ekhramtsov@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2021   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(sm_tests).

%% API
-compile(export_all).
-import(suite, [send/2, recv/1, close_socket/1, set_opt/3, my_jid/1,
		recv_message/1, disconnect/1, send_recv/2,
		put_event/2, get_event/1]).

-include("suite.hrl").

%%%===================================================================
%%% API
%%%===================================================================
%%%===================================================================
%%% Single user tests
%%%===================================================================
single_cases() ->
    {sm_single, [sequence],
     [single_test(feature_enabled),
      single_test(enable),
      single_test(resume),
      single_test(resume_failed)]}.

feature_enabled(Config) ->
    true = ?config(sm, Config),
    disconnect(Config).

enable(Config) ->
    Server = ?config(server, Config),
    ServerJID = jid:make(<<"">>, Server, <<"">>),
    ct:comment("Send messages of type 'headline' so the server discards them silently"),
    Msg = #message{to = ServerJID, type = headline,
		   body = [#text{data = <<"body">>}]},
    ct:comment("Enable the session management with resumption enabled"),
    send(Config, #sm_enable{resume = true, xmlns = ?NS_STREAM_MGMT_3}),
    #sm_enabled{id = ID, resume = true} = recv(Config),
    ct:comment("Initial request; 'h' should be 0"),
    send(Config, #sm_r{xmlns = ?NS_STREAM_MGMT_3}),
    #sm_a{h = 0} = recv(Config),
    ct:comment("Sending two messages and requesting again; 'h' should be 3"),
    send(Config, Msg),
    send(Config, Msg),
    send(Config, Msg),
    send(Config, #sm_r{xmlns = ?NS_STREAM_MGMT_3}),
    #sm_a{h = 3} = recv(Config),
    ct:comment("Closing socket"),
    close_socket(Config),
    {save_config, set_opt(sm_previd, ID, Config)}.

resume(Config) ->
    {_, SMConfig} = ?config(saved_config, Config),
    ID = ?config(sm_previd, SMConfig),
    Server = ?config(server, Config),
    ServerJID = jid:make(<<"">>, Server, <<"">>),
    MyJID = my_jid(Config),
    Txt = #text{data = <<"body">>},
    Msg = #message{from = ServerJID, to = MyJID, body = [Txt]},
    ct:comment("Route message. The message should be queued by the C2S process"),
    ejabberd_router:route(Msg),
    ct:comment("Resuming the session"),
    send(Config, #sm_resume{previd = ID, h = 0, xmlns = ?NS_STREAM_MGMT_3}),
    #sm_resumed{previd = ID, h = 3} = recv(Config),
    ct:comment("Receiving unacknowledged stanza"),
    #message{from = ServerJID, to = MyJID, body = [Txt]} = recv_message(Config),
    #sm_r{} = recv(Config),
    send(Config, #sm_a{h = 1, xmlns = ?NS_STREAM_MGMT_3}),
    ct:comment("Checking if the server counts stanzas correctly"),
    send(Config, #sm_r{xmlns = ?NS_STREAM_MGMT_3}),
    #sm_a{h = 3} = recv(Config),
    ct:comment("Send another stanza to increment the server's 'h' for sm_resume_failed"),
    send(Config, #presence{to = ServerJID}),
    ct:comment("Closing socket"),
    close_socket(Config),
    {save_config, set_opt(sm_previd, ID, Config)}.

resume_failed(Config) ->
    {_, SMConfig} = ?config(saved_config, Config),
    ID = ?config(sm_previd, SMConfig),
    ct:comment("Waiting for the session to time out"),
    ct:sleep(5000),
    ct:comment("Trying to resume timed out session"),
    send(Config, #sm_resume{previd = ID, h = 1, xmlns = ?NS_STREAM_MGMT_3}),
    #sm_failed{reason = 'item-not-found', h = 4} = recv(Config),
    disconnect(Config).

%%%===================================================================
%%% Master-slave tests
%%%===================================================================
master_slave_cases() ->
    {sm_master_slave, [sequence],
     [master_slave_test(queue_limit),
      master_slave_test(queue_limit_detached)]}.

queue_limit_master(Config) ->
    ct:comment("Waiting for 'send' command from the peer"),
    send = get_event(Config),
    send_recv_messages(Config),
    ct:comment("Waiting for peer to disconnect"),
    peer_down = get_event(Config),
    disconnect(Config).

queue_limit_slave(Config) ->
    ct:comment("Enable the session management without resumption"),
    send(Config, #sm_enable{xmlns = ?NS_STREAM_MGMT_3}),
    #sm_enabled{resume = false} = recv(Config),
    put_event(Config, send),
    ct:comment("Receiving all messages"),
    lists:foreach(
      fun(I) ->
	      ID = integer_to_binary(I),
	      Body = xmpp:mk_text(ID),
	      #message{id = ID, body = Body} = recv_message(Config)
      end, lists:seq(1, 11)),
    ct:comment("Receiving request ACK"),
    #sm_r{} = recv(Config),
    ct:comment("Receiving policy-violation stream error"),
    #stream_error{reason = 'policy-violation'} = recv(Config),
    {xmlstreamend, <<"stream:stream">>} = recv(Config),
    ct:comment("Closing socket"),
    close_socket(Config).

queue_limit_detached_master(Config) ->
    ct:comment("Waiting for the peer to disconnect"),
    peer_down = get_event(Config),
    send_recv_messages(Config),
    disconnect(Config).

queue_limit_detached_slave(Config) ->
    #presence{} = send_recv(Config, #presence{}),
    ct:comment("Enable the session management with resumption enabled"),
    send(Config, #sm_enable{resume = true, xmlns = ?NS_STREAM_MGMT_3}),
    #sm_enabled{resume = true} = recv(Config),
    ct:comment("Closing socket"),
    close_socket(Config).

%%%===================================================================
%%% Internal functions
%%%===================================================================
single_test(T) ->
    list_to_atom("sm_" ++ atom_to_list(T)).

master_slave_test(T) ->
    {list_to_atom("sm_" ++ atom_to_list(T)), [parallel],
     [list_to_atom("sm_" ++ atom_to_list(T) ++ "_master"),
      list_to_atom("sm_" ++ atom_to_list(T) ++ "_slave")]}.

send_recv_messages(Config) ->
    PeerJID = ?config(peer, Config),
    Msg = #message{to = PeerJID},
    ct:comment("Sending messages to peer"),
    lists:foreach(
      fun(I) ->
	      ID = integer_to_binary(I),
	      send(Config, Msg#message{id = ID, body = xmpp:mk_text(ID)})
      end, lists:seq(1, 11)),
    ct:comment("Receiving bounced messages from the peer"),
    lists:foreach(
      fun(I) ->
	      ID = integer_to_binary(I),
	      Err = #message{id = ID, type = error} = recv_message(Config),
	      #stanza_error{reason = 'service-unavailable'} = xmpp:get_error(Err)
      end, lists:seq(1, 11)).