1: %% Stream Management tests
    2: -module(sm_SUITE).
    3: 
    4: -compile([export_all, nowarn_export_all]).
    5: -include_lib("exml/include/exml.hrl").
    6: -include_lib("eunit/include/eunit.hrl").
    7: -include_lib("escalus/include/escalus.hrl").
    8: -include_lib("common_test/include/ct.hrl").
    9: 
   10: %% Injected code callbacks
   11: -export([rpc_start_hook_handler/3,
   12:          rpc_stop_hook_handler/2,
   13:          hook_handler_fn/3,
   14:          regression_handler/5]).
   15: 
   16: -export([rpc_start_filter_hook_handler/3,
   17:          rpc_stop_filter_hook_handler/2,
   18:          filter_hook_handler_fn/3]).
   19: 
   20: -import(distributed_helper, [mim/0,
   21:                              require_rpc_nodes/1,
   22:                              rpc/4]).
   23: 
   24: -import(domain_helper, [host_type/0]).
   25: 
   26: -import(sm_helper, [connect_fresh/3,
   27:                     connect_fresh/4,
   28:                     connect_spec/2,
   29:                     connect_spec/3,
   30:                     connect_same/2,
   31:                     connect_same/3,
   32:                     connect_resume/2,
   33:                     process_initial_stanza/1,
   34:                     send_initial_presence/1,
   35:                     get_ack/1,
   36:                     ack_initial_presence/1]).
   37: 
   38: -define(MOD_SM, mod_stream_management).
   39: -define(CONSTRAINT_CHECK_TIMEOUT, 5000).
   40: -define(LONG_TIMEOUT, 3600).
   41: -define(SHORT_TIMEOUT, 1).
   42: -define(SMALL_SM_BUFFER, 3).
   43: -define(PING_REQUEST_TIMEOUT, 1).
   44: -define(PING_INTERVAL, 3).
   45: 
   46: %%--------------------------------------------------------------------
   47: %% Suite configuration
   48: %%--------------------------------------------------------------------
   49: 
   50: suite() ->
   51:     require_rpc_nodes([mim]) ++ escalus:suite().
   52: 
   53: all() ->
   54:     ct_helper:groups_to_all(groups()) ++ [ping_timeout].
   55: 
   56: groups() ->
   57:     [
   58:      {parallel, [parallel], parallel_cases()},
   59:      {parallel_manual_ack_freq_1, [parallel], parallel_manual_ack_freq_1_cases()},
   60:      {manual_ack_freq_2, [], manual_ack_freq_2_cases()},
   61:      {stale_h, [], stale_h_cases()},
   62:      {parallel_unacknowledged_message_hook, [parallel], parallel_unacknowledged_message_hook_cases()}
   63:     ].
   64: 
   65: parallel_cases() ->
   66:     [server_announces_sm,
   67:      server_enables_sm_before_session,
   68:      server_enables_sm_after_session,
   69:      server_returns_failed_after_start,
   70:      server_returns_failed_after_auth,
   71:      server_enables_resumption,
   72:      client_enables_sm_twice_fails_with_correct_error_stanza,
   73:      session_resumed_then_old_session_is_closed_gracefully_with_correct_error_stanza,
   74:      session_resumed_and_old_session_dead_doesnt_route_error_to_new_session,
   75:      basic_ack,
   76:      h_ok_before_session,
   77:      h_ok_after_session_enabled_before_session,
   78:      h_ok_after_session_enabled_after_session,
   79:      h_ok_after_a_chat,
   80:      h_non_given_closes_stream_gracefully,
   81:      resend_unacked_on_reconnection,
   82:      session_established,
   83:      wait_for_resumption,
   84:      resume_session,
   85:      resume_session_with_wrong_h_does_not_leak_sessions,
   86:      resume_session_with_wrong_sid_returns_item_not_found,
   87:      resume_session_with_wrong_namespace_is_a_noop,
   88:      resume_dead_session_results_in_item_not_found,
   89:      resume_session_kills_old_C2S_gracefully,
   90:      carboncopy_works,
   91:      carboncopy_works_after_resume,
   92:      aggressively_pipelined_resume,
   93:      replies_are_processed_by_resumed_session,
   94:      subscription_requests_are_buffered_properly,
   95:      messages_are_properly_flushed_during_resumption].
   96: 
   97: parallel_manual_ack_freq_1_cases() ->
   98:     [client_acks_more_than_sent,
   99:      too_many_unacked_stanzas,
  100:      resend_unacked_after_resume_timeout,
  101:      resume_session_state_send_message_with_ack,
  102:      resume_session_state_send_message_without_ack,
  103:      resume_session_state_stop_c2s,
  104:      server_requests_ack_after_session,
  105:      resend_more_offline_messages_than_buffer_size,
  106:      server_requests_ack].
  107: 
  108: manual_ack_freq_2_cases() ->
  109:     [server_requests_ack_freq_2].
  110: 
  111: stale_h_cases() ->
  112:     [resume_expired_session_returns_correct_h,
  113:      gc_repeat_after_never_means_no_cleaning,
  114:      gc_repeat_after_timeout_does_clean].
  115: 
  116: stream_mgmt_disabled_cases() ->
  117:     [no_crash_if_stream_mgmt_disabled_but_client_requests_stream_mgmt,
  118:      no_crash_if_stream_mgmt_disabled_but_client_requests_stream_mgmt_with_resumption].
  119: 
  120: manual_ack_freq_long_session_timeout_cases() ->
  121:     [preserve_order].
  122: 
  123: parallel_unacknowledged_message_hook_cases() ->
  124:     [unacknowledged_message_hook_bounce,
  125:      unacknowledged_message_hook_offline,
  126:      unacknowledged_message_hook_resume,
  127:      unacknowledged_message_hook_filter].
  128: 
  129: %%--------------------------------------------------------------------
  130: %% Init & teardown
  131: %%--------------------------------------------------------------------
  132: 
  133: init_per_suite(Config) ->
  134:     NewConfig = dynamic_modules:save_modules(host_type(), Config),
  135:     NewConfigWithSM = escalus_users:update_userspec(NewConfig, alice, stream_management, true),
  136:     mongoose_helper:inject_module(?MODULE),
  137:     escalus:init_per_suite(NewConfigWithSM).
  138: 
  139: end_per_suite(Config) ->
  140:     escalus_fresh:clean(),
  141:     dynamic_modules:restore_modules(Config),
  142:     escalus:end_per_suite(Config).
  143: 
  144: init_per_group(Group, Config) when Group =:= parallel_unacknowledged_message_hook;
  145:                                    Group =:= manual_ack_freq_long_session_timeout;
  146:                                    Group =:= parallel_manual_ack_freq_1;
  147:                                    Group =:= manual_ack_freq_2 ->
  148:     dynamic_modules:ensure_modules(host_type(), required_modules(group, Group)),
  149:     Config;
  150: init_per_group(stale_h, Config) ->
  151:     Config;
  152: init_per_group(stream_mgmt_disabled, Config) ->
  153:     dynamic_modules:stop(host_type(), ?MOD_SM),
  154:     rpc(mim(), mnesia, delete_table, [sm_session]),
  155:     Config;
  156: init_per_group(Group, Config) ->
  157:     dynamic_modules:ensure_modules(host_type(), required_modules(group, Group)),
  158:     Config.
  159: 
  160: end_per_group(_Group, _Config) ->
  161:     ok.
  162: 
  163: init_per_testcase(resume_expired_session_returns_correct_h = CN, Config) ->
  164:     dynamic_modules:ensure_modules(host_type(), required_modules(testcase, CN)),
  165:     escalus:init_per_testcase(CN, Config);
  166: init_per_testcase(CN, Config) when CN =:= gc_repeat_after_never_means_no_cleaning;
  167:                                    CN =:= gc_repeat_after_timeout_does_clean ->
  168:     dynamic_modules:ensure_modules(host_type(), required_modules(testcase, CN)),
  169:     Config2 = register_some_smid_h(Config),
  170:     escalus:init_per_testcase(CN, Config2);
  171: init_per_testcase(ping_timeout = CN, Config) ->
  172:     ok = rpc(mim(), meck, new, [mod_ping, [passthrough, no_link]]),
  173:     dynamic_modules:ensure_modules(host_type(), required_modules(testcase, CN)),
  174:     escalus:init_per_testcase(CN, Config);
  175: init_per_testcase(server_requests_ack_freq_2 = CN, Config) ->
  176:     escalus:init_per_testcase(CN, Config);
  177: init_per_testcase(replies_are_processed_by_resumed_session = CN, Config) ->
  178:     register_handler(),
  179:     escalus:init_per_testcase(CN, Config);
  180: init_per_testcase(CaseName, Config) ->
  181:     escalus:init_per_testcase(CaseName, Config).
  182: 
  183: end_per_testcase(CN, Config) when CN =:= resume_expired_session_returns_correct_h;
  184:                                   CN =:= gc_repeat_after_never_means_no_cleaning;
  185:                                   CN =:= gc_repeat_after_timeout_does_clean ->
  186:     Name = rpc(mim(), gen_mod, get_module_proc, [host_type(), stream_management_stale_h]),
  187:     rpc(mim(), ejabberd_sup, stop_child, [Name]),
  188:     escalus:end_per_testcase(CN, Config);
  189: end_per_testcase(replies_are_processed_by_resumed_session = CN, Config) ->
  190:     unregister_handler(),
  191:     escalus:end_per_testcase(CN, Config);
  192: end_per_testcase(ping_timeout = CN, Config) ->
  193:     rpc(mim(), meck, unload, [mod_ping]),
  194:     escalus:end_per_testcase(CN, Config);
  195: end_per_testcase(CaseName, Config) ->
  196:     escalus:end_per_testcase(CaseName, Config).
  197: 
  198: %% Module configuration per group (in case of stale_h group it is per testcase)
  199: 
  200: required_modules(Scope, Name) ->
  201:     SMConfig = case required_sm_opts(Scope, Name) of
  202:                    stopped -> stopped;
  203:                    ExtraOpts -> maps:merge(common_sm_opts(), ExtraOpts)
  204:                end,
  205:     Backend = mongoose_helper:mnesia_or_rdbms_backend(),
  206:     BaseModules = [
  207:      {mod_stream_management, config_parser_helper:mod_config(mod_stream_management, SMConfig)},
  208:      {mod_offline, config_parser_helper:mod_config(mod_offline, #{backend => Backend})}
  209:      ],
  210:      case Name of
  211:         ping_timeout ->
  212:             BaseModules ++ [{mod_ping, config_parser_helper:mod_config(mod_ping, mod_ping_opts())}];
  213:         _ ->
  214:             BaseModules
  215:     end.
  216: 
  217: required_sm_opts(group, parallel) ->
  218:     #{ack_freq => never};
  219: required_sm_opts(group, parallel_manual_ack_freq_1) ->
  220:     #{ack_freq => 1,
  221:       resume_timeout => ?LONG_TIMEOUT};
  222: required_sm_opts(group, manual_ack_freq_2) ->
  223:     #{ack_freq => 2};
  224: required_sm_opts(group, stream_mgmt_disabled) ->
  225:     stopped;
  226: required_sm_opts(group, parallel_unacknowledged_message_hook) ->
  227:     #{ack_freq => 1};
  228: required_sm_opts(group, manual_ack_freq_long_session_timeout) ->
  229:     #{ack_freq => 1, buffer_max => 1000};
  230: required_sm_opts(testcase, resume_expired_session_returns_correct_h) ->
  231:     #{ack_freq => 1,
  232:       resume_timeout => ?SHORT_TIMEOUT,
  233:       stale_h => stale_h(?LONG_TIMEOUT, ?LONG_TIMEOUT)};
  234: required_sm_opts(testcase, gc_repeat_after_never_means_no_cleaning) ->
  235:     #{stale_h => stale_h(?LONG_TIMEOUT, ?SHORT_TIMEOUT)};
  236: required_sm_opts(testcase, gc_repeat_after_timeout_does_clean) ->
  237:     #{stale_h => stale_h(?SHORT_TIMEOUT, ?SHORT_TIMEOUT)};
  238: required_sm_opts(testcase, ping_timeout) ->
  239:     #{ack_freq => 1,
  240:       resume_timeout => ?SHORT_TIMEOUT}.
  241: 
  242: common_sm_opts() ->
  243:     Backend = ct_helper:get_internal_database(),
  244:     #{buffer_max => ?SMALL_SM_BUFFER, backend => Backend}.
  245: 
  246: stale_h(RepeatAfter, Geriatric) ->
  247:     #{enabled => true,
  248:       repeat_after => RepeatAfter,
  249:       geriatric => Geriatric}.
  250: 
  251: make_smid() ->
  252:     base64:encode(crypto:strong_rand_bytes(21)).
  253: 
  254: register_smid(IntSmidId) ->
  255:     S = {SMID = make_smid(), IntSmidId},
  256:     ok = rpc(mim(), ?MOD_SM, register_stale_smid_h, [host_type(), SMID, IntSmidId]),
  257:     S.
  258: 
  259: register_some_smid_h(Config) ->
  260:     TestSmids = lists:map(fun register_smid/1, lists:seq(1, 3)),
  261:     [{smid_test, TestSmids} | Config].
  262: 
  263: mod_ping_opts() ->
  264:     #{send_pings => true,
  265:       ping_interval => ?PING_INTERVAL,
  266:       ping_req_timeout => ?PING_REQUEST_TIMEOUT,
  267:       timeout_action => kill}.
  268: 
  269: %%--------------------------------------------------------------------
  270: %% Tests
  271: %%--------------------------------------------------------------------
  272: 
  273: server_announces_sm(Config) ->
  274:     AliceSpec = escalus_fresh:freshen_spec(Config, alice),
  275:     {ok, #client{props = Props}, Features} = escalus_connection:start(AliceSpec,
  276:                                                                       [start_stream]),
  277:     true = escalus_session:can_use_stream_management(Props, Features).
  278: 
  279: 
  280: server_enables_sm_before_session(Config) ->
  281:     connect_fresh(Config, alice, sm_after_bind).
  282: 
  283: server_enables_sm_after_session(Config) ->
  284:     connect_fresh(Config, alice, sm_after_session).
  285: 
  286: server_returns_failed_after_start(Config) ->
  287:     Alice = connect_fresh(Config, alice, before_auth),
  288:     server_returns_failed(Alice).
  289: 
  290: server_returns_failed_after_auth(Config) ->
  291:     Alice = connect_fresh(Config, alice, auth),
  292:     server_returns_failed(Alice).
  293: 
  294: server_enables_resumption(Config) ->
  295:     Alice = connect_fresh(Config, alice, sr_presence),
  296:     escalus_connection:stop(Alice).
  297: 
  298: server_returns_failed(Alice) ->
  299:     escalus_connection:send(Alice, escalus_stanza:enable_sm()),
  300:     escalus:assert(is_sm_failed, [<<"unexpected-request">>],
  301:                    escalus_connection:get_stanza(Alice, enable_sm_failed)).
  302: 
  303: client_enables_sm_twice_fails_with_correct_error_stanza(Config) ->
  304:     Alice = connect_fresh(Config, alice, sm_before_session),
  305:     escalus_connection:send(Alice, escalus_stanza:enable_sm()),
  306:     escalus:assert(is_sm_failed, [<<"unexpected-request">>],
  307:                    escalus_connection:get_stanza(Alice, enable_sm_failed)),
  308:     escalus:assert(is_stream_end,
  309:                    escalus_connection:get_stanza(Alice, enable_sm_failed)),
  310:     true = escalus_connection:wait_for_close(Alice, timer:seconds(5)).
  311: 
  312: session_resumed_then_old_session_is_closed_gracefully_with_correct_error_stanza(Config) ->
  313:     %% GIVEN USER WITH STREAM RESUMPTION ENABLED
  314:     Alice = connect_fresh(Config, alice, sr_presence),
  315:     SMH = escalus_connection:get_sm_h(Alice),
  316:     %% WHEN USER RESUMES SESSION FROM NEW CLIENT
  317:     Alice2 = connect_resume(Alice, SMH),
  318:     process_initial_stanza(Alice2),
  319:     %% THEN: Old session is gracefully closed with the correct error stanza
  320:     escalus:assert(is_stream_error, [<<"conflict">>, <<>>],
  321:                    escalus_connection:get_stanza(Alice, close_old_stream)),
  322:     escalus:assert(is_stream_end,
  323:                    escalus_connection:get_stanza(Alice, close_old_stream)),
  324:     true = escalus_connection:wait_for_close(Alice, timer:seconds(5)),
  325:     true = escalus_connection:is_connected(Alice2),
  326:     escalus_connection:stop(Alice2).
  327: 
  328: session_resumed_and_old_session_dead_doesnt_route_error_to_new_session(Config) ->
  329:     %% GIVEN USER WITH STREAM RESUMPTION ENABLED
  330:     Alice = connect_fresh(Config, alice, sr_presence),
  331:     %% WHEN FIRST SESSION DIES AND USER RESUMES FROM NEW CLIENT
  332:     Alice2 = sm_helper:kill_and_connect_resume(Alice),
  333:     process_initial_stanza(Alice2),
  334:     %% THEN new session does not have any message rerouted
  335:     false = escalus_client:has_stanzas(Alice2),
  336:     true = escalus_connection:is_connected(Alice2),
  337:     escalus_connection:stop(Alice2).
  338: 
  339: basic_ack(Config) ->
  340:     Alice = connect_fresh(Config, alice, sm_after_session),
  341:     escalus_connection:send(Alice, escalus_stanza:roster_get()),
  342:     escalus:assert(is_roster_result,
  343:                    escalus_connection:get_stanza(Alice, roster_result)),
  344:     escalus_connection:send(Alice, escalus_stanza:sm_request()),
  345:     escalus:assert(is_sm_ack,
  346:                    escalus_connection:get_stanza(Alice, stream_mgmt_ack)).
  347: 
  348: %% Test that "h" value is valid when:
  349: %% - SM is enabled *before* the session is established
  350: %% - <r/> is sent *before* the session is established
  351: h_ok_before_session(Config) ->
  352:     Alice = connect_fresh(Config, alice, sm_after_bind),
  353:     escalus_connection:send(Alice, escalus_stanza:sm_request()),
  354:     escalus:assert(is_sm_ack, [0],
  355:                    escalus_connection:get_stanza(Alice, stream_mgmt_ack)).
  356: 
  357: %% Test that "h" value is valid when:
  358: %% - SM is enabled *before* the session is established
  359: %% - <r/> is sent *after* the session is established
  360: h_ok_after_session_enabled_before_session(Config) ->
  361:     Alice = connect_fresh(Config, alice, sm_before_session),
  362:     escalus_connection:send(Alice, escalus_stanza:sm_request()),
  363:     escalus:assert(is_sm_ack, [1],
  364:                    escalus_connection:get_stanza(Alice, stream_mgmt_ack)).
  365: 
  366: %% Test that "h" value is valid when:
  367: %% - SM is enabled *after* the session is established
  368: %% - <r/> is sent *after* the session is established
  369: h_ok_after_session_enabled_after_session(Config) ->
  370:     Alice = connect_fresh(Config, alice, sm_after_session),
  371:     escalus_connection:send(Alice, escalus_stanza:roster_get()),
  372:     escalus:assert(is_roster_result,
  373:                    escalus_connection:get_stanza(Alice, roster_result)),
  374:     escalus_connection:send(Alice, escalus_stanza:sm_request()),
  375:     escalus:assert(is_sm_ack, [1],
  376:                    escalus_connection:get_stanza(Alice, stream_mgmt_ack)).
  377: 
  378: %% Test that "h" value is valid after exchanging a few messages.
  379: h_ok_after_a_chat(ConfigIn) ->
  380:     Config = escalus_users:update_userspec(ConfigIn, alice,
  381:                                            stream_management, true),
  382:     escalus:fresh_story(Config, [{alice,1}, {bob,1}], fun(Alice, Bob) ->
  383:         escalus:send(Alice, escalus_stanza:chat_to(Bob, <<"Hi, Bob!">>)),
  384:         escalus:assert(is_chat_message, [<<"Hi, Bob!">>],
  385:                        escalus:wait_for_stanza(Bob)),
  386:         escalus:send(Bob, escalus_stanza:chat_to(Alice, <<"Hi, Alice!">>)),
  387:         escalus:assert(is_chat_message, [<<"Hi, Alice!">>],
  388:                        escalus:wait_for_stanza(Alice)),
  389:         escalus:send(Bob, escalus_stanza:chat_to(Alice, <<"How's life?">>)),
  390:         escalus:assert(is_chat_message, [<<"How's life?">>],
  391:                        escalus:wait_for_stanza(Alice)),
  392:         escalus:send(Alice, escalus_stanza:chat_to(Bob, <<"Pretty !@#$%^$">>)),
  393:         escalus:assert(is_chat_message, [<<"Pretty !@#$%^$">>],
  394:                        escalus:wait_for_stanza(Bob)),
  395:         escalus:send(Alice, escalus_stanza:sm_request()),
  396:         escalus:assert(is_sm_ack, [3], escalus:wait_for_stanza(Alice)),
  397:         %% Ack, so that unacked messages don't go into offline store.
  398:         escalus:send(Alice, escalus_stanza:sm_ack(3))
  399:     end).
  400: 
  401: h_non_given_closes_stream_gracefully(ConfigIn) ->
  402:     AStanza = #xmlel{name = <<"a">>,
  403:                attrs = [{<<"xmlns">>, <<"urn:xmpp:sm:3">>}]},
  404:     Config = escalus_users:update_userspec(ConfigIn, alice,
  405:                                            stream_management, true),
  406:     escalus:fresh_story(Config, [{alice,1}], fun(Alice) ->
  407:         C2SPid = mongoose_helper:get_session_pid(Alice),
  408:         escalus:send(Alice, AStanza),
  409:         escalus:assert(is_stream_error,
  410:                        [<<"policy-violation">>, <<>>],
  411:                        escalus:wait_for_stanza(Alice)),
  412:         mongoose_helper:wait_for_pid_to_die(C2SPid),
  413:         escalus:assert(is_stream_end, escalus_connection:get_stanza(Alice, stream_end)),
  414:         true = escalus_connection:wait_for_close(Alice, timer:seconds(5))
  415:     end).
  416: 
  417: client_acks_more_than_sent(Config) ->
  418:     Alice = connect_fresh(Config, alice, sm_after_session),
  419:     escalus:send(Alice, escalus_stanza:sm_ack(5)),
  420:     StreamErrorStanza = escalus:wait_for_stanza(Alice),
  421:     %% Assert "undefined-condition" children
  422:     escalus:assert(is_stream_error, [<<"undefined-condition">>, <<>>], StreamErrorStanza),
  423:     %% Assert "handled-count-too-high" children with correct attributes
  424:     HandledCountSubElement = exml_query:path(StreamErrorStanza,
  425:                                              [{element_with_ns,
  426:                                                <<"handled-count-too-high">>,
  427:                                                <<"urn:xmpp:sm:3">>}]),
  428:     <<"5">> = exml_query:attr(HandledCountSubElement, <<"h">>),
  429:     <<"0">> = exml_query:attr(HandledCountSubElement, <<"send-count">>),
  430:     %% Assert graceful stream end
  431:     escalus:assert(is_stream_end, escalus_connection:get_stanza(Alice, stream_end)),
  432:     true = escalus_connection:wait_for_close(Alice, timer:seconds(5)).
  433: 
  434: too_many_unacked_stanzas(Config) ->
  435:     Bob = connect_fresh(Config, bob, presence),
  436:     Alice = connect_fresh(Config, alice, sm_presence, manual),
  437:     get_ack(Alice),
  438:     [escalus:send(Bob, escalus_stanza:chat_to(Alice,
  439:         <<(integer_to_binary(N))/binary, ": Hi, Alice!">>))
  440:      || N <- lists:seq(1,?SMALL_SM_BUFFER)],
  441:     escalus:wait_for_stanzas(Alice, ?SMALL_SM_BUFFER * 2), % messages and ack requests
  442:     escalus:assert(is_stream_error, [<<"resource-constraint">>,
  443:                                      <<"too many unacked stanzas">>],
  444:                    %% wait for deferred buffer check
  445:                    escalus:wait_for_stanza(Alice, ?CONSTRAINT_CHECK_TIMEOUT + 1000)).
  446: 
  447: server_requests_ack(Config) ->
  448:     server_requests_ack(Config, 1).
  449: 
  450: server_requests_ack_freq_2(Config) ->
  451:     server_requests_ack(Config, 2).
  452: 
  453: server_requests_ack(Config, N) ->
  454:     Bob = connect_fresh(Config, bob, presence),
  455:     Alice = connect_fresh(Config, alice, sm_presence, manual),
  456:     %% ack request after initial presence
  457:     maybe_assert_ack_request(1, N, Alice),
  458:     escalus:send(Bob, escalus_stanza:chat_to(Alice, <<"Hi, Alice!">>)),
  459:     escalus:assert(is_chat_message, [<<"Hi, Alice!">>],
  460:                    escalus:wait_for_stanza(Alice)),
  461:     maybe_assert_ack_request(2, N, Alice).
  462: 
  463: maybe_assert_ack_request(StanzasRec, AckRequests, Alice) ->
  464:     ct:log("StanzasRec: ~p, AckRequests: ~p", [StanzasRec, AckRequests]),
  465:     case StanzasRec rem AckRequests of
  466:         0 ->
  467:             escalus:assert(is_sm_ack_request, escalus:wait_for_stanza(Alice));
  468:         _ ->
  469:             ok
  470:     end,
  471:     StanzasRec.
  472: 
  473: server_requests_ack_after_session(Config) ->
  474:     Alice = connect_fresh(Config, alice, sm_before_session, manual),
  475:     escalus:assert(is_sm_ack_request, escalus_connection:get_stanza(Alice, stream_mgmt_req)).
  476: 
  477: resend_more_offline_messages_than_buffer_size(Config) ->
  478:     %% connect bob and alice
  479:     Bob = connect_fresh(Config, bob, presence),
  480:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
  481: 
  482:     % sent some messages - more than unacked buffer size
  483:     MessagesToSend = ?SMALL_SM_BUFFER + 1,
  484:     AliceJid = common_helper:get_bjid(AliceSpec),
  485:     [escalus_connection:send(Bob, escalus_stanza:chat_to(AliceJid, integer_to_binary(I)))
  486:      || I <- lists:seq(1, MessagesToSend)],
  487:     mongoose_helper:wait_for_n_offline_messages(AliceJid, MessagesToSend),
  488: 
  489:     % connect alice who wants to receive all messages from offline storage
  490:     Alice = connect_spec(AliceSpec, sm_after_session, manual),
  491:     send_initial_presence(Alice),
  492:     escalus:wait_for_stanzas(Alice, MessagesToSend * 2), %messages and ack requests
  493: 
  494:     escalus_connection:get_stanza(Alice, presence),
  495:     get_ack(Alice), % ack request
  496: 
  497:     % confirm messages + presence
  498:     escalus_connection:send(Alice, escalus_stanza:sm_ack(4)),
  499:     % wait for check constraint message on server side
  500: 
  501:     ct:sleep(?CONSTRAINT_CHECK_TIMEOUT + 1000),
  502:     false = escalus_client:has_stanzas(Alice),
  503:     % should not receive anything especially any stream errors
  504: 
  505:     escalus_connection:stop(Alice),
  506:     escalus_connection:stop(Bob).
  507: 
  508: resend_unacked_on_reconnection(Config) ->
  509:     Texts = three_texts(),
  510:     Bob = connect_fresh(Config, bob, presence),
  511:     Alice = connect_fresh(Config, alice, sm_presence),
  512:     AliceSpec = sm_helper:client_to_spec0(Alice),
  513:     %% Bob sends some messages to Alice.
  514:     sm_helper:send_messages(Bob, Alice, Texts),
  515:     %% Alice receives the messages.
  516:     sm_helper:wait_for_messages(Alice, Texts),
  517:     %% Alice disconnects without acking the messages.
  518:     sm_helper:stop_client_and_wait_for_termination(Alice),
  519:     %% Messages go to the offline store.
  520:     %% Alice receives the messages from the offline store.
  521:     NewAlice = connect_spec(AliceSpec, session, manual),
  522:     send_initial_presence(NewAlice),
  523:     sm_helper:wait_for_messages(NewAlice, Texts),
  524:     %% Alice acks the delayed messages so they won't go again
  525:     %% to the offline store.
  526:     escalus_connection:send(NewAlice, escalus_stanza:sm_ack(3)).
  527: 
  528: %% Remove wait_for_n_offline_messages and you will get anything, but preserve_order
  529: %% TODO Test without wait_for_n_offline_messages. It would require changes in SM
  530: %%      and more strict tests, reproducing delays in SM and in mod_offline.
  531: preserve_order(Config) ->
  532:     %% connect bob and alice
  533:     Bob = connect_fresh(Config, bob, presence),
  534:     Alice = connect_fresh(Config, alice, sr_presence, manual),
  535:     AliceSpec = sm_helper:client_to_spec(Alice),
  536:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"1">>)),
  537: 
  538:     %% kill alice connection
  539:     escalus_connection:kill(Alice),
  540:     C2SPid = mongoose_helper:get_session_pid(Alice),
  541:     sm_helper:wait_until_resume_session(C2SPid),
  542: 
  543:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"2">>)),
  544:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"3">>)),
  545: 
  546:     NewAlice = connect_spec(AliceSpec, session, manual),
  547:     escalus_connection:send(NewAlice, escalus_stanza:enable_sm([resume])),
  548: 
  549:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"4">>)),
  550:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"5">>)),
  551: 
  552:     %% Without this check we will get stuff out of order
  553:     mongoose_helper:wait_for_n_offline_messages(NewAlice, 5),
  554: 
  555:     send_initial_presence(NewAlice),
  556:     %% Without this check we can get "6, 1, 2, 3, 4, 5" messages in the next receive_all_ordered
  557:     mongoose_helper:wait_for_n_offline_messages(NewAlice, 0),
  558:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"6">>)),
  559: 
  560:     %% "2, 3, 4, 5, 6, 1" is possible (where only 1 is from offline storage, the rest is from sm)
  561:     receive_all_ordered(NewAlice, 6),
  562: 
  563:     % replace connection
  564:     NewAlice2 = connect_spec(AliceSpec, session, manual),
  565:     % allow messages to go to the offline storage
  566:     mongoose_helper:wait_for_n_offline_messages(NewAlice, 6),
  567: 
  568:     send_initial_presence(NewAlice2),
  569: 
  570:     % receves messages in correct order
  571:     receive_all_ordered(NewAlice2, 6),
  572: 
  573:     escalus_connection:stop(Bob),
  574:     escalus_connection:stop(NewAlice2).
  575: 
  576: receive_all_ordered(Conn, Last) ->
  577:     receive_all_ordered(Conn, 1, Last, []).
  578: 
  579: %% Receive messages from N to Last.
  580: %% Ignores acks and presences.
  581: %% Handles case when out of order and when not enough stanzas.
  582: receive_all_ordered(_Conn, N, Last, Acc) when N > Last ->
  583:     Texts = lists:map(fun integer_to_binary/1, lists:seq(1, Last)),
  584:     sm_helper:assert_messages(Acc, Texts);
  585: receive_all_ordered(Conn, N, Last, Acc) ->
  586:     Stanzas = escalus:wait_for_stanzas(Conn, 1),
  587:     case Stanzas of
  588:         [#xmlel{name = <<"message">>}] ->
  589:             receive_all_ordered(Conn, N + 1, Last, Acc ++ Stanzas);
  590:         [_] -> %% Ack or presence
  591:             receive_all_ordered(Conn, N, Last, Acc);
  592:         [] ->
  593:             ct:fail({timeout_waiting, N, Acc})
  594:     end.
  595: 
  596: resend_unacked_after_resume_timeout(Config) ->
  597:     %% connect bob and alice
  598:     Bob = connect_fresh(Config, bob, presence),
  599:     Alice = connect_fresh(Config, alice, sr_presence),
  600:     AliceSpec = sm_helper:client_to_spec(Alice),
  601: 
  602:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-1">>)),
  603:     %% kill alice connection
  604:     escalus_connection:kill(Alice),
  605: 
  606:     %% ensure there is no session
  607:     C2SPid = mongoose_helper:get_session_pid(Alice),
  608:     sm_helper:wait_until_resume_session(C2SPid),
  609: 
  610:     %% alice come back and receives unacked message
  611:     NewAlice = connect_spec(AliceSpec, session),
  612:     send_initial_presence(NewAlice),
  613: 
  614:     escalus_new_assert:mix_match([is_presence, is_chat(<<"msg-1">>)],
  615:                                  escalus:wait_for_stanzas(NewAlice, 2)),
  616: 
  617:     escalus_connection:stop(Bob),
  618:     escalus_connection:stop(NewAlice).
  619: 
  620: ping_timeout(Config) ->
  621:     %% make sure there are no leftover stanzas in the history
  622:     ?assertEqual([], get_stanzas_filtered_by_mod_ping()),
  623: 
  624:     %% connect Alice and wait for the session to close
  625:     Alice = connect_fresh(Config, alice, sr_presence),
  626: 
  627:     escalus_client:wait_for_stanza(Alice),
  628:     ct:sleep(?PING_REQUEST_TIMEOUT + ?PING_INTERVAL + timer:seconds(1)),
  629: 
  630:     %% attempt to resume the session after the connection drop
  631:     NewAlice = sm_helper:kill_and_connect_with_resume_session_without_waiting_for_result(Alice),
  632: 
  633:     %% after resume_timeout, we expect the session to be closed
  634:     escalus_connection:get_stanza(NewAlice, failed_resumption),
  635: 
  636:     %% bind a new session and expect unacknowledged messages to be resent
  637:     escalus_session:session(escalus_session:bind(NewAlice)),
  638:     send_initial_presence(NewAlice),
  639: 
  640:     %% check if the error stanza was handled by mod_ping
  641:     [Stanza] = get_stanzas_filtered_by_mod_ping(),
  642:     escalus:assert(is_iq_error, Stanza),
  643:     ?assertNotEqual(undefined,
  644:         exml_query:subelement_with_name_and_ns(Stanza, <<"ping">>, <<"urn:xmpp:ping">>)),
  645: 
  646:     %% stop the connection
  647:     escalus_connection:stop(NewAlice).
  648: 
  649: resume_expired_session_returns_correct_h(Config) ->
  650:     %% connect bob and alice
  651:     Bob = connect_fresh(Config, bob, sr_presence),
  652:     Alice = connect_fresh(Config, alice, sr_presence, manual),
  653:     get_ack(Alice),
  654: 
  655:     %% Bob sends a message to Alice, and Alice receives it but doesn't acknowledge
  656:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-1">>)),
  657:     escalus:assert(is_chat_message, [<<"msg-1">>], escalus:wait_for_stanza(Alice)),
  658:     %% alice comes back, but too late, so resumption doesn't work,
  659:     %% but she receives the previous h = 1 anyway
  660:     %% NewAlice is also manual ack
  661:     NewAlice = sm_helper:kill_and_connect_with_resume_session_without_waiting_for_result(Alice),
  662:     FailedResumption = escalus_connection:get_stanza(NewAlice, failed_resumption),
  663:     <<"1">> = exml_query:attr(FailedResumption, <<"h">>),
  664:     %% And we can continue with bind and session
  665:     escalus_session:session(escalus_session:bind(NewAlice)),
  666:     send_initial_presence(NewAlice),
  667:     Stanzas = [escalus_connection:get_stanza(NewAlice, {msg, 1}),
  668:                escalus_connection:get_stanza(NewAlice, {msg, 2})],
  669:     escalus_new_assert:mix_match([is_presence, is_chat(<<"msg-1">>)], Stanzas),
  670:     escalus_connection:stop(Bob),
  671:     escalus_connection:stop(NewAlice).
  672: 
  673: gc_repeat_after_never_means_no_cleaning(Config) ->
  674:     [{SMID1, _}, {SMID2, _}, {SMID3, _}] = ?config(smid_test, Config),
  675:     {stale_h, 1} = rpc(mim(), ?MOD_SM, get_session_from_smid, [host_type(), SMID1]),
  676:     {stale_h, 2} = rpc(mim(), ?MOD_SM, get_session_from_smid, [host_type(), SMID2]),
  677:     {stale_h, 3} = rpc(mim(), ?MOD_SM, get_session_from_smid, [host_type(), SMID3]).
  678: 
  679: gc_repeat_after_timeout_does_clean(Config) ->
  680:     [{SMID1, _} | _ ] = ?config(smid_test, Config),
  681:     mongoose_helper:wait_until(fun() ->
  682:                                        rpc(mim(), ?MOD_SM, get_stale_h, [host_type(), SMID1])
  683:                                end,
  684:                                {error, smid_not_found},
  685:                                #{name => smid_garbage_collected}).
  686: 
  687: resume_session_state_send_message_without_ack(Config) ->
  688:     resume_session_state_send_message_generic(Config, no_ack).
  689: 
  690: resume_session_state_send_message_with_ack(Config) ->
  691:     resume_session_state_send_message_generic(Config, ack).
  692: 
  693: resume_session_state_send_message_generic(Config, AckInitialPresence) ->
  694:     %% connect bob and alice
  695:     Bob = connect_fresh(Config, bob, presence),
  696:     Alice = connect_fresh(Config, alice, sr_presence, manual),
  697:     maybe_ack_initial_presence(Alice, AckInitialPresence),
  698:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-1">>)),
  699:     %% kill alice connection
  700:     C2SPid = mongoose_helper:get_session_pid(Alice),
  701:     escalus_connection:kill(Alice),
  702:     sm_helper:wait_until_resume_session(C2SPid),
  703:     sm_helper:assert_alive_resources(Alice, 1),
  704: 
  705:     %% send some messages and check if c2s can handle it
  706:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-2">>)),
  707:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-3">>)),
  708:     %% suspend the process to ensure that Alice has enough time to reconnect,
  709:     %% before resumption timeout occurs.
  710:     ok = rpc(mim(), sys, suspend, [C2SPid]),
  711: 
  712:     %% alice comes back and receives unacked message
  713:     NewAlice = connect_same(Alice, presence),
  714:     %% now we can resume c2s process of the old connection
  715:     %% and let it process session resumption timeout
  716:     ok = rpc(mim(), sys, resume, [C2SPid]),
  717:     Stanzas = escalus:wait_for_stanzas(NewAlice, 3),
  718: 
  719:     % what about order ?
  720:     % alice receive presence from herself and 3 unacked messages from bob
  721:     escalus_new_assert:mix_match([is_chat(<<"msg-1">>),
  722:                                   is_chat(<<"msg-2">>),
  723:                                   is_chat(<<"msg-3">>)],
  724:                                  Stanzas),
  725:     escalus_connection:stop(Bob),
  726:     escalus_connection:stop(NewAlice).
  727: 
  728: %%for instance it can be done by mod ping
  729: resume_session_state_stop_c2s(Config) ->
  730:     Bob = connect_fresh(Config, bob, presence),
  731:     Alice = connect_fresh(Config, alice, sr_presence, manual),
  732: 
  733:     get_ack(Alice),
  734:     ack_initial_presence(Alice),
  735: 
  736:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-1">>)),
  737:     escalus:assert(is_chat_message, [<<"msg-1">>], escalus_connection:get_stanza(Alice, msg)),
  738: 
  739:     %% get pid of c2s
  740:     C2SPid = mongoose_helper:get_session_pid(Alice),
  741:     %% Wait c2s process to process our presence ack.
  742:     %% Otherwise, we can receive two initial presences sometimes.
  743:     sm_helper:wait_for_c2s_unacked_count(C2SPid, 1),
  744: 
  745:     % kill alice connection
  746:     escalus_connection:kill(Alice),
  747:     % session should be alive
  748:     sm_helper:assert_alive_resources(Alice, 1),
  749:     rpc(mim(), mongoose_c2s, stop, [C2SPid, normal]),
  750:     sm_helper:wait_until_resume_session(C2SPid),
  751:     %% suspend the process to ensure that Alice has enough time to reconnect,
  752:     %% before resumption timeout occurs.
  753:     ok = rpc(mim(), sys, suspend, [C2SPid]),
  754: 
  755:     %% alice comes back and receives unacked message
  756:     NewAlice = connect_same(Alice, presence, manual),
  757:     %% now we can resume c2s process of the old connection
  758:     %% and let it process session resumption timeout
  759:     ok = rpc(mim(), sys, resume, [C2SPid]),
  760: 
  761:     escalus:assert(is_chat_message, [<<"msg-1">>], escalus_connection:get_stanza(NewAlice, msg)),
  762:     escalus_connection:stop(Bob),
  763:     escalus_connection:stop(NewAlice).
  764: 
  765: %% This test only verifies the validity of helpers (get_session_pid,
  766: %% get_c2s_state_name) written for wait_for_resumption
  767: %% testcase.
  768: session_established(Config) ->
  769:     Alice = connect_fresh(Config, alice, presence),
  770:     C2SPid = mongoose_helper:get_session_pid(Alice),
  771:     session_established = mongoose_helper:get_c2s_state_name(C2SPid),
  772:     escalus_connection:stop(Alice).
  773: 
  774: %% Ensure that after a violent disconnection,
  775: %% the c2s waits for resumption (but don't resume yet).
  776: wait_for_resumption(Config) ->
  777:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
  778:     Bob = connect_fresh(Config, bob, session),
  779:     Texts = three_texts(),
  780:     {C2SPid, _} = buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts),
  781:     sm_helper:wait_until_resume_session(C2SPid).
  782: 
  783: unacknowledged_message_hook_filter(Config) ->
  784:     FilterText = <<"filter">>,
  785:     Bob = connect_fresh(Config, bob, presence),
  786:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
  787:     Resource = proplists:get_value(username, AliceSpec),
  788:     HookHandlerExtra = start_filter_hook_listener(FilterText, Resource),
  789:     Alice = connect_spec([{resource, Resource} | AliceSpec], sr_presence, manual),
  790:     %% Ack the presence stanza
  791:     get_ack(Alice),
  792:     ack_initial_presence(Alice),
  793:     Messages = [<<"msg-1">>, <<"msg-2">>, <<"msg-3">>, <<"msg-4">>],
  794:     All = [<<"msg-1">>, FilterText, <<"msg-2">>, FilterText, <<"msg-3">>, <<"msg-4">>],
  795:     [ escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, Body)) || Body <- All ],
  796:     %% kill alice connection
  797:     C2SPid = mongoose_helper:get_session_pid(Alice),
  798:     escalus_connection:kill(Alice),
  799:     sm_helper:wait_until_resume_session(C2SPid),
  800:     sm_helper:assert_alive_resources(Alice, 1),
  801:     %% ensure second C2S is registered so all the messages are bounced properly
  802:     NewAlice = connect_spec([{resource, <<"2">>}| AliceSpec], sr_presence, manual),
  803:     send_initial_presence(NewAlice),
  804:     sm_helper:wait_for_resource_count(NewAlice, 2),
  805:     ok = rpc(mim(), sys, terminate, [C2SPid, normal]),
  806:     %% verify that the filtered message is never received
  807:     verify_no_receive_filtertext(NewAlice, FilterText, Messages),
  808:     stop_hook_listener(HookHandlerExtra),
  809:     escalus_connection:stop(Bob).
  810: 
  811: verify_no_receive_filtertext(_, _, []) ->
  812:     ok;
  813: verify_no_receive_filtertext(Client, FilterText, Messages) ->
  814:     case escalus:wait_for_stanzas(Client, 1, 500) of
  815:         [] -> ct:fail("Messages pending: ~p~n", [Messages]);
  816:         [St] ->
  817:             case exml_query:path(St, [{element, <<"body">>}, cdata]) of
  818:                 undefined ->
  819:                     verify_no_receive_filtertext(Client, FilterText, Messages);
  820:                 FilterText ->
  821:                     ct:fail("Composing forwarded from a different c2s process");
  822:                 Message ->
  823:                     Pred = fun(Msg) -> Msg =/= Message end,
  824:                     {Pending, _} = lists:partition(Pred, Messages),
  825:                     verify_no_receive_filtertext(Client, FilterText, Pending)
  826:             end
  827:     end.
  828: 
  829: unacknowledged_message_hook_resume(Config) ->
  830:     unacknowledged_message_hook_common(fun unacknowledged_message_hook_resume/4, Config).
  831: 
  832: unacknowledged_message_hook_resume(AliceSpec, Resource, SMID, _C2SPid) ->
  833:     NewAlice = connect_spec(AliceSpec, {resume, SMID, 1}, manual),
  834:     send_initial_presence(NewAlice),
  835:     {Resource, NewAlice}.
  836: 
  837: unacknowledged_message_hook_bounce(Config) ->
  838:     unacknowledged_message_hook_common(fun unacknowledged_message_hook_bounce/4, Config).
  839: 
  840: unacknowledged_message_hook_bounce(AliceSpec, Resource, _SMID, C2SPid) ->
  841:     NewResource = <<"new_", Resource/binary>>,
  842:     NewSpec = lists:keystore(resource, 1, AliceSpec, {resource, NewResource}),
  843:     NewAlice = connect_spec(NewSpec, sr_session, manual),
  844:     send_initial_presence(NewAlice),
  845:     %% ensure second C2S is registered so all the messages are bounced properly
  846:     sm_helper:wait_for_resource_count(NewAlice, 2),
  847:     ok = rpc(mim(), sys, terminate, [C2SPid, normal]),
  848:     {NewResource, NewAlice}.
  849: 
  850: unacknowledged_message_hook_offline(Config) ->
  851:     unacknowledged_message_hook_common(fun unacknowledged_message_hook_offline/4, Config).
  852: 
  853: unacknowledged_message_hook_offline(AliceSpec, Resource, _SMID, C2SPid) ->
  854:     C2SRef = erlang:monitor(process, C2SPid),
  855:     sm_helper:wait_for_process_termination(C2SRef),
  856:     %% reset the session, so old C2S process is stopped
  857:     NewAlice = connect_spec(AliceSpec, sr_session, manual),
  858:     %% wait for old C2S termination before send presence. other way
  859:     %% some of the latest unacknowledged messages can be bounced to
  860:     %% the new C2S process instead of going to the mod_offline storage.
  861:     %% looks like all the unacknowledged messages arrive to the new
  862:     %% C2S, but the message sequence is broken (the bounced messages
  863:     %% delivered before the messages from the mod_offline storage)
  864:     send_initial_presence(NewAlice),
  865:     {Resource, NewAlice}.
  866: 
  867: unacknowledged_message_hook_common(RestartConnectionFN, Config) ->
  868:     %% connect bob and alice
  869:     Bob = connect_fresh(Config, bob, presence),
  870: 
  871:     AliceSpec0 = escalus_fresh:create_fresh_user(Config, alice),
  872:     Resource = proplists:get_value(username, AliceSpec0),
  873:     AliceSpec = [{resource, Resource} | AliceSpec0],
  874:     HookHandlerExtra = start_hook_listener(Resource),
  875:     Alice = connect_spec(AliceSpec, sr_presence, manual),
  876:     %% Ack the presence stanza
  877:     get_ack(Alice),
  878:     ack_initial_presence(Alice),
  879: 
  880:     SMID = sm_helper:client_to_smid(Alice),
  881: 
  882:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-1">>)),
  883:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-2">>)),
  884:     %% kill alice connection
  885:     C2SPid = mongoose_helper:get_session_pid(Alice),
  886:     escalus_connection:kill(Alice),
  887:     sm_helper:wait_until_resume_session(C2SPid),
  888:     sm_helper:assert_alive_resources(Alice, 1),
  889: 
  890:     escalus:assert(is_chat_message, [<<"msg-1">>], wait_for_unacked_msg_hook(0, Resource, 100)),
  891:     escalus:assert(is_chat_message, [<<"msg-2">>], wait_for_unacked_msg_hook(0, Resource, 100)),
  892:     ?assertEqual(timeout, wait_for_unacked_msg_hook(0, Resource, 100)),
  893: 
  894:     %% send some messages and check if c2s can handle it
  895:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-3">>)),
  896:     escalus_connection:send(Bob, escalus_stanza:chat_to_short_jid(Alice, <<"msg-4">>)),
  897:     escalus:assert(is_chat_message, [<<"msg-3">>], wait_for_unacked_msg_hook(0, Resource, 100)),
  898:     escalus:assert(is_chat_message, [<<"msg-4">>], wait_for_unacked_msg_hook(0, Resource, 100)),
  899:     ?assertEqual(timeout, wait_for_unacked_msg_hook(0, Resource, 100)),
  900: 
  901:     %% alice comes back and receives unacked message
  902:     {NewResource, NewAlice} = RestartConnectionFN(AliceSpec, Resource, SMID, C2SPid),
  903: 
  904:     mongoose_helper:wait_until(
  905:         fun() ->
  906:             Stanza = escalus_connection:get_stanza(NewAlice, msg),
  907:             escalus:assert(is_chat_message, [<<"msg-4">>], Stanza),
  908:             ok
  909:         end, ok),
  910: 
  911:     NewC2SPid = mongoose_helper:get_session_pid(NewAlice),
  912:     escalus_connection:kill(NewAlice),
  913:     sm_helper:wait_until_resume_session(NewC2SPid),
  914: 
  915:     escalus:assert(is_chat_message, [<<"msg-1">>], wait_for_unacked_msg_hook(1, NewResource, 100)),
  916:     escalus:assert(is_chat_message, [<<"msg-2">>], wait_for_unacked_msg_hook(1, NewResource, 100)),
  917:     escalus:assert(is_chat_message, [<<"msg-3">>], wait_for_unacked_msg_hook(1, NewResource, 100)),
  918:     escalus:assert(is_chat_message, [<<"msg-4">>], wait_for_unacked_msg_hook(1, NewResource, 100)),
  919:     ?assertEqual(timeout, wait_for_unacked_msg_hook(0, Resource, 100)),
  920:     stop_hook_listener(HookHandlerExtra),
  921:     escalus_connection:stop(Bob).
  922: 
  923: resume_session(Config) ->
  924:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
  925:     Texts = three_texts(),
  926:     escalus:fresh_story(Config, [{bob, 1}], fun(Bob) ->
  927:         {_, SMID} = buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts),
  928:         %% Resume the session.
  929:         Alice = connect_spec(AliceSpec, {resume, SMID, 1}, manual),
  930:         %% Alice receives the unacked messages from the previous
  931:         %% interrupted session.
  932:         sm_helper:wait_for_messages(Alice, Texts),
  933:         %% Alice acks the received messages.
  934:         escalus_connection:send(Alice, escalus_stanza:sm_ack(5)),
  935:         escalus_connection:stop(Alice)
  936:     end).
  937: 
  938: resume_session_with_wrong_h_does_not_leak_sessions(Config) ->
  939:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
  940:     Messages = three_texts(),
  941:     HostType = host_type(),
  942:     escalus:fresh_story(Config, [{bob, 1}], fun(Bob) ->
  943:         {_, SMID} = buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Messages),
  944:         %% Resume the session.
  945:         Alice = connect_spec(AliceSpec, auth, manual),
  946:         Resumed = sm_helper:try_to_resume_stream(Alice, SMID, 30),
  947:         escalus:assert(is_stream_error, [<<"undefined-condition">>, <<>>], Resumed),
  948:         escalus_connection:wait_for_close(Alice, timer:seconds(5)),
  949:         Fun = fun() ->
  950:                       [] = sm_helper:get_user_present_resources(Alice),
  951:                       sm_helper:get_sid_by_stream_id(HostType, SMID)
  952:               end,
  953:         mongoose_helper:wait_until(Fun, {error, smid_not_found}, #{name => smid_is_cleaned})
  954:     end).
  955: 
  956: resume_session_with_wrong_sid_returns_item_not_found(Config) ->
  957:     session_resumption_expects_item_not_found(Config, <<"wrong-sid">>).
  958: 
  959: resume_session_with_wrong_namespace_is_a_noop(Config) ->
  960:     Alice = connect_fresh(Config, alice, auth),
  961:     #xmlel{attrs = Attrs} = Resume = escalus_stanza:resume(<<"doesnt_matter">>, 4),
  962:     Attrs2 = lists:keyreplace(<<"xmlns">>, 1, Attrs, {<<"xmlns">>, <<"not-stream-mgnt">>}),
  963:     escalus_connection:send(Alice, Resume#xmlel{attrs = Attrs2}),
  964:     escalus_assert:has_no_stanzas(Alice),
  965:     [] = sm_helper:get_user_present_resources(Alice),
  966:     true = escalus_connection:is_connected(Alice),
  967:     escalus_connection:stop(Alice).
  968: 
  969: resume_dead_session_results_in_item_not_found(Config) ->
  970:     SMID = base64:encode(crypto:strong_rand_bytes(21)),
  971:     SID = {os:timestamp(), undefined},
  972:     HostType = host_type(),
  973:     rpc(mim(), ?MOD_SM, register_smid, [HostType, SMID, SID]),
  974:     session_resumption_expects_item_not_found(Config, SMID).
  975: 
  976: session_resumption_expects_item_not_found(Config, SMID) ->
  977:     Alice = connect_fresh(Config, alice, auth),
  978:     Resumed = sm_helper:try_to_resume_stream(Alice, SMID, 2),
  979:     escalus:assert(is_sm_failed, [<<"item-not-found">>], Resumed),
  980:     [] = sm_helper:get_user_present_resources(Alice),
  981:     true = escalus_connection:is_connected(Alice),
  982:     escalus_connection:stop(Alice).
  983: 
  984: resume_session_kills_old_C2S_gracefully(Config) ->
  985:     Alice = connect_fresh(Config, alice, sr_presence, manual),
  986:     C2SPid = mongoose_helper:get_session_pid(Alice),
  987: 
  988:     %% Monitor the C2S process and disconnect Alice.
  989:     MonitorRef = sm_helper:monitor_session(Alice),
  990:     escalus_client:kill_connection(Config, Alice),
  991: 
  992:     %% Ensure the c2s process is waiting for resumption.
  993:     sm_helper:wait_until_resume_session(C2SPid),
  994: 
  995:     %% Resume the session.
  996:     NewAlice = connect_resume(Alice, 1),
  997: 
  998:     %% C2S process should die gracefully with Reason=normal.
  999:     sm_helper:wait_for_process_termination(MonitorRef),
 1000:     escalus_connection:stop(NewAlice).
 1001: 
 1002: carboncopy_works(Config) ->
 1003:     escalus:fresh_story(Config, [{alice, 2}, {bob, 1}], fun(Alice1, Alice, Bob) ->
 1004:         mongoose_helper:enable_carbons([Alice1, Alice]),
 1005:         escalus_connection:send(Bob, escalus_stanza:chat_to(Alice1, <<"msg-4">>)),
 1006:         sm_helper:wait_for_messages(Alice1, [<<"msg-4">>]),
 1007:         carboncopy_helper:wait_for_carbon_chat_with_body(Alice, <<"msg-4">>, #{from => Bob, to => Alice1})
 1008:     end).
 1009: 
 1010: carboncopy_works_after_resume(Config) ->
 1011:     Texts = three_texts(),
 1012:     escalus:fresh_story(Config, [{alice, 1}, {bob, 1}], fun(Alice1, Bob) ->
 1013:         AliceSpec = [{resource, <<"res2">>} | sm_helper:client_to_spec(Alice1)],
 1014:         F = fun(Alice2) ->
 1015:             [escalus:assert(is_presence_with_type, [<<"available">>], escalus:wait_for_stanza(A)) || A <- [Alice1, Alice2]],
 1016:             mongoose_helper:enable_carbons([Alice1, Alice2])
 1017:             end,
 1018:         {_, SMID} = buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts, F),
 1019:         %% Resume the session.
 1020:         Alice = connect_spec(AliceSpec, {resume, SMID, 1}, manual),
 1021:         wait_for_carbon_with_bodies(Alice1, Texts, #{from => Bob, to => Alice}),
 1022:         %% Get a presence from Alice1 again
 1023:         escalus:assert(is_presence_with_type, [<<"available">>], escalus:wait_for_stanza(Alice)),
 1024:         %% Alice receives an IQ result from the carbon copy enable request
 1025:         escalus:assert(is_iq_result, [], escalus:wait_for_stanza(Alice)),
 1026:         %% Alice receives the unacked messages from the previous
 1027:         %% interrupted session.
 1028:         sm_helper:wait_for_messages(Alice, Texts),
 1029:         %% Alice acks the received messages.
 1030:         escalus_connection:send(Alice, escalus_stanza:sm_ack(5)),
 1031:         %% Direct send
 1032:         escalus_connection:send(Bob, escalus_stanza:chat_to(Alice1, <<"msg-4">>)),
 1033:         sm_helper:wait_for_messages(Alice1, [<<"msg-4">>]),
 1034:         carboncopy_helper:wait_for_carbon_chat_with_body(Alice, <<"msg-4">>, #{from => Bob, to => Alice1}),
 1035:         escalus_connection:stop(Alice)
 1036:     end).
 1037: 
 1038: wait_for_carbon_with_bodies(Client, Texts, Params) ->
 1039:     [carboncopy_helper:wait_for_carbon_chat_with_body(Client, Text, Params) || Text <- Texts].
 1040: 
 1041: buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts) ->
 1042:     F = fun(_Client) -> ok end,
 1043:     buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts, F).
 1044: 
 1045: buffer_unacked_messages_and_die(Config, AliceSpec, Bob, Texts, F) ->
 1046:     Alice = connect_spec(AliceSpec, sr_presence, manual),
 1047:     F(Alice),
 1048:     C2SPid = mongoose_helper:get_session_pid(Alice),
 1049:     %% Bobs sends some messages to Alice.
 1050:     sm_helper:send_messages(Bob, Alice, Texts),
 1051:     %% Alice receives them, but doesn't ack.
 1052:     sm_helper:wait_for_messages(Alice, Texts),
 1053:     %% Alice's connection is violently terminated.
 1054:     escalus_client:kill_connection(Config, Alice),
 1055:     sm_helper:wait_until_resume_session(C2SPid),
 1056:     SMID = sm_helper:client_to_smid(Alice),
 1057:     {C2SPid, SMID}.
 1058: 
 1059: aggressively_pipelined_resume(Config) ->
 1060:     AliceSpec = [{manual_ack, true}, {parser_opts, [{start_tag, <<"stream:stream">>}]}
 1061:                  | escalus_fresh:create_fresh_user(Config, alice)],
 1062:     UnackedMessages = three_texts(),
 1063:     escalus:fresh_story(Config, [{bob, 1}], fun(Bob) ->
 1064:         {_, SMID} = buffer_unacked_messages_and_die(Config, AliceSpec, Bob, UnackedMessages),
 1065:         %% Resume the session.
 1066:         Alice = escalus_connection:connect(AliceSpec),
 1067: 
 1068:         Username = proplists:get_value(username, AliceSpec),
 1069:         Password = proplists:get_value(password, AliceSpec),
 1070:         Payload = <<0:8,Username/binary,0:8,Password/binary>>,
 1071:         Server = proplists:get_value(server, AliceSpec),
 1072: 
 1073:         Stream = escalus_stanza:stream_start(Server, <<"jabber:client">>),
 1074:         Auth = escalus_stanza:auth(<<"PLAIN">>, [#xmlcdata{content = base64:encode(Payload)}]),
 1075:         AuthStream = escalus_stanza:stream_start(Server, <<"jabber:client">>),
 1076:         Resume = escalus_stanza:resume(SMID, 2),
 1077: 
 1078:         escalus_client:send(Alice, [Stream, Auth, AuthStream, Resume]),
 1079:         Messages = [escalus_connection:get_stanza(Alice, {get_resumed, I}) || I <- lists:seq(1, 6)],
 1080:         escalus:assert(is_sm_resumed, [SMID], lists:last(Messages)),
 1081: 
 1082:         escalus_connection:stop(Alice)
 1083:     end).
 1084: 
 1085: %% This is a regression test for a case when a session processes a request, which will
 1086: %% receive a response from the server, i.e. will have the same origin SID in mongoose_acc.
 1087: %% Without proper handling, the reply would be rejected because the resumed session
 1088: %% has new SID.
 1089: replies_are_processed_by_resumed_session(Config) ->
 1090:     %% GIVEN a session and registered special IQ handler (added in init_per_testcase),
 1091:     %% that waits for old session process to terminate (at this point new process
 1092:     %% has fully taken over) and then actually sends the reply.
 1093:     Alice = connect_fresh(Config, alice, sr_presence),
 1094: 
 1095:     %% WHEN a client sends IQ request to the special handler...
 1096:     IQReq = escalus_stanza:iq_get(regression_ns(), []),
 1097:     escalus:send(Alice, IQReq),
 1098: 
 1099:     %% ... goes down and session is resumed.
 1100:     Alice2 = sm_helper:kill_and_connect_resume(Alice),
 1101: 
 1102:     %% THEN the client receives the reply properly.
 1103:     IQReply = escalus:wait_for_stanza(Alice2),
 1104:     escalus:assert(is_iq_result, [IQReq], IQReply),
 1105:     escalus_connection:stop(Alice2).
 1106: 
 1107: %% This is a regression test for a bug, which manifested in following scenario
 1108: %% (due to improper presence sub requests buffering):
 1109: %% 1. Bob is online, Alice is offline
 1110: %% 2. Bob subscribes to Alice's presence;
 1111: %% 3. Alice becomes online
 1112: %% 4. Bob sends a message to Alice
 1113: %% 5. Alice doesn't SM-ack the request or message, terminates the connection
 1114: %% 6. Alice reconnects but with session *replace*, not resume
 1115: %% 7. Packet rerouting crashes on the buffered sub request, preventing resending whole buffer
 1116: %% 8. Alice doesn't receive the buffered message
 1117: subscription_requests_are_buffered_properly(Config) ->
 1118:     AliceSpec = escalus_fresh:create_fresh_user(Config, alice),
 1119:     MsgBody = <<"buffered">>,
 1120:     escalus:fresh_story(Config, [{bob, 1}], fun(Bob) ->
 1121:         % GIVEN Bob's pending subscription to Alice's presence
 1122:         AliceJid = common_helper:get_bjid(AliceSpec),
 1123:         escalus:send(Bob, escalus_stanza:presence_direct(AliceJid, <<"subscribe">>)),
 1124:         _RosterPushReq = escalus:wait_for_stanza(Bob),
 1125: 
 1126:         % WHEN Alice becomes online...
 1127:         Alice = connect_spec(AliceSpec, sr_session, manual),
 1128:         send_initial_presence(Alice),
 1129:         %% subscribe could come before the initial presence
 1130:         escalus:assert_many([is_presence(<<"available">>), is_presence(<<"subscribe">>)],
 1131:                             escalus:wait_for_stanzas(Alice, 2)),
 1132: 
 1133:         % ...and Bob sends a message to Alice...
 1134:         escalus:send(Bob, escalus_stanza:chat_to(Alice, MsgBody)),
 1135:         MsgStanza = escalus:wait_for_stanza(Alice),
 1136:         escalus:assert(is_chat_message, [MsgBody], MsgStanza),
 1137: 
 1138:         % ...and Alice terminates connection without acking anything...
 1139:         escalus_client:kill_connection(Config, Alice),
 1140: 
 1141:         % ...and reconnects with session replacement.
 1142:         Alice2 = connect_spec(AliceSpec, session, manual),
 1143: 
 1144:         % THEN Alice receives (without sending initial presence):
 1145:         % * buffered Bob's message (like above)
 1146:         % Alice DOESN'T receive:
 1147:         % * buffered subscription request because it is dropped by ejabberd_sm
 1148:         %   because it's treated like repeated sub request to bare JID, so it's not
 1149:         %   processed by any sub req handler (like mod_roster)
 1150:         % * buffered available presence from Alice - because it is addressed to another SID
 1151:         %   and Alice2 is a brand new session
 1152:         escalus:assert(is_chat_message, [MsgBody], escalus:wait_for_stanza(Alice2)),
 1153:         sm_helper:send_and_receive(Bob, Alice2, <<"flush1">>),
 1154:         escalus_assert:has_no_stanzas(Alice2),
 1155: 
 1156:         %% Only once an initial presence is sent, a subscription request is sent
 1157:         send_initial_presence(Alice2),
 1158:         escalus:assert_many([is_presence(<<"available">>), is_presence(<<"subscribe">>)],
 1159:                             escalus:wait_for_stanzas(Alice2, 2)),
 1160: 
 1161:         sm_helper:send_and_receive(Bob, Alice2, <<"flush2">>),
 1162:         escalus_assert:has_no_stanzas(Alice2),
 1163: 
 1164:         escalus_connection:stop(Alice2)
 1165:     end).
 1166: 
 1167: %% This is a regression test for a bug, due to which messages sent to old session
 1168: %% in a middle of state handover were not appended properly to SM buffer.
 1169: %% Scenario to reproduce:
 1170: %% 1. Online Bob and Alice
 1171: %% 2. Alice kills the connection
 1172: %% 3. Alice's session is suspended
 1173: %% 4. Alice resumes session with new connection. At this moment new session is still not
 1174: %%    present in session table. `resume` request is stuck in old proc mailbox.
 1175: %% 5. Bob sends a message to Alice. Only old proc is present in session table so now
 1176: %%    old session has two messages in mailbox: `resume` and XML from Bob
 1177: %% 6. We resume old process and it begins session handover
 1178: %% 7. Bob's message is appended to SM buffer in "flush" step
 1179: %% 8. With bug fixed, the message is retransmitted properly
 1180: messages_are_properly_flushed_during_resumption(Config) ->
 1181:     escalus:fresh_story(Config, [{bob, 1}], fun(Bob) ->
 1182:         % GIVEN (online Bob) and (Alice in resume state); Alice's session is suspended
 1183:         Alice = connect_fresh(Config, alice, sr_presence),
 1184:         SMH = escalus_connection:get_sm_h(Alice),
 1185:         escalus_client:kill_connection(Config, Alice),
 1186:         %% The receiver process would stop now
 1187:         C2SPid = mongoose_helper:get_session_pid(Alice),
 1188:         sm_helper:wait_until_resume_session(C2SPid),
 1189: 
 1190:         sm_helper:wait_for_queue_length(C2SPid, 0),
 1191:         ok = rpc(mim(), sys, suspend, [C2SPid]),
 1192: 
 1193:         % WHEN new session requests resumption
 1194:         % we wait until that old session has resumption request enqueued;
 1195:         % we need it to ensure the order of messages: resume first, Bob's chat second.
 1196:         % Actual wait and message sent by Bob is done in separate process
 1197:         % because new client start will block until old process is resumed
 1198: 
 1199:         MsgBody = <<"flush-regression">>,
 1200:         spawn_link(fun() ->
 1201:                       sm_helper:wait_for_queue_length(C2SPid, 1),
 1202: 
 1203:                       % Bob sends a message...
 1204:                       escalus:send(Bob, escalus_stanza:chat_to(Alice, MsgBody)),
 1205: 
 1206:                       % ...we ensure that a message is enqueued in Alice's session...
 1207:                       % (2 messages = resume request + Bob's message)
 1208:                       sm_helper:wait_for_queue_length(C2SPid, 2),
 1209: 
 1210:                       % ...and old process is resumed.
 1211:                       ok = rpc(mim(), sys, resume, [C2SPid])
 1212:               end),
 1213:         Alice2 = connect_resume(Alice, SMH),
 1214:         % THEN Alice's new session receives Bob's message
 1215:         RecvMsg = escalus:wait_for_stanza(Alice2),
 1216:         escalus:assert(is_chat_message, [MsgBody], RecvMsg)
 1217:       end).
 1218: 
 1219: no_crash_if_stream_mgmt_disabled_but_client_requests_stream_mgmt(Config) ->
 1220:     Alice = connect_fresh(Config, alice, session, manual),
 1221:     %% Should not crash anything!
 1222:     escalus_connection:send(Alice, escalus_stanza:enable_sm()),
 1223:     Response = escalus_connection:get_stanza(Alice, service_unavailable),
 1224:     escalus:assert(is_sm_failed, [<<"feature-not-implemented">>], Response),
 1225:     escalus_connection:stop(Alice).
 1226: 
 1227: no_crash_if_stream_mgmt_disabled_but_client_requests_stream_mgmt_with_resumption(Config) ->
 1228:     Alice = connect_fresh(Config, alice, session, manual),
 1229:     %% Should not crash anything!
 1230:     escalus_connection:send(Alice, escalus_stanza:enable_sm([resume])),
 1231:     Response = escalus_connection:get_stanza(Alice, service_unavailable),
 1232:     escalus:assert(is_sm_failed, [<<"feature-not-implemented">>], Response),
 1233:     escalus_connection:stop(Alice).
 1234: 
 1235: %%--------------------------------------------------------------------
 1236: %% Helpers
 1237: %%--------------------------------------------------------------------
 1238: start_hook_listener(Resource) ->
 1239:     TestCasePid = self(),
 1240:     rpc(mim(), ?MODULE, rpc_start_hook_handler, [TestCasePid, Resource, host_type()]).
 1241: 
 1242: stop_hook_listener(HookExtra) ->
 1243:     rpc(mim(), ?MODULE, rpc_stop_hook_handler, [HookExtra, host_type()]).
 1244: 
 1245: rpc_start_hook_handler(TestCasePid, User, HostType) ->
 1246:     LUser = jid:nodeprep(User),
 1247:     Extra = #{luser => LUser, pid => TestCasePid},
 1248:     gen_hook:add_handler(unacknowledged_message, HostType,
 1249:                          fun ?MODULE:hook_handler_fn/3,
 1250:                          Extra, 50),
 1251:     Extra.
 1252: 
 1253: rpc_stop_hook_handler(HookExtra, HostType) ->
 1254:     gen_hook:delete_handler(unacknowledged_message, HostType,
 1255:                             fun ?MODULE:hook_handler_fn/3,
 1256:                             HookExtra, 50).
 1257: 
 1258: hook_handler_fn(Acc,
 1259:                 #{jid := Jid} = _Params,
 1260:                 #{luser := LUser, pid := TestCasePid} = _Extra) ->
 1261:     {U, _S, R} = jid:to_lower(Jid),
 1262:     case U of
 1263:         LUser ->
 1264:             Counter = mongoose_acc:get(sm_test, counter, 0, Acc),
 1265:             El = mongoose_acc:element(Acc),
 1266:             TestCasePid ! {sm_test, Counter, R, El},
 1267:             {ok, mongoose_acc:set_permanent(sm_test, counter, Counter + 1, Acc)};
 1268:         _ -> {ok, Acc}
 1269:     end.
 1270: 
 1271: wait_for_unacked_msg_hook(Counter, Res, Timeout) ->
 1272:     receive
 1273:         {sm_test, AccCounter, Resource, Stanza} = Msg ->
 1274:             ?assertEqual(Counter, AccCounter, Msg),
 1275:             ?assertEqual(Res, Resource, Msg),
 1276:             Stanza
 1277:     after Timeout ->
 1278:         timeout
 1279:     end.
 1280: 
 1281: start_filter_hook_listener(FilterText, Resource) ->
 1282:     rpc(mim(), ?MODULE, rpc_start_filter_hook_handler, [FilterText, Resource, host_type()]).
 1283: 
 1284: stop_filter_hook_listener(HookExtra) ->
 1285:     rpc(mim(), ?MODULE, rpc_stop_filter_hook_handler, [HookExtra, host_type()]).
 1286: 
 1287: rpc_start_filter_hook_handler(FilterText, User, HostType) ->
 1288:     LUser = jid:nodeprep(User),
 1289:     Extra = #{luser => LUser, filter_text => FilterText},
 1290:     gen_hook:add_handler(filter_unacknowledged_messages, HostType,
 1291:                          fun ?MODULE:filter_hook_handler_fn/3,
 1292:                          Extra, 50),
 1293:     Extra.
 1294: 
 1295: rpc_stop_filter_hook_handler(HookExtra, HostType) ->
 1296:     gen_hook:delete_handler(filter_unacknowledged_messages, HostType,
 1297:                             fun ?MODULE:filter_hook_handler_fn/3,
 1298:                             HookExtra, 50).
 1299: 
 1300: filter_hook_handler_fn(Buffer,
 1301:                        #{jid := Jid} = _Params,
 1302:                        #{luser := LUser, filter_text := FilterText} = _Extra) ->
 1303:     {U, _} = jid:to_lus(Jid),
 1304:     case U of
 1305:         LUser ->
 1306:             F = fun(Acc) -> filter_text(Acc, FilterText) end,
 1307:             NewBuffer = lists:filter(F, Buffer),
 1308:             {ok, NewBuffer};
 1309:         _ -> {ok, Buffer}
 1310:     end.
 1311: 
 1312: filter_text(Acc, FilterText) ->
 1313:     case mongoose_acc:stanza_name(Acc) of
 1314:         <<"message">> ->
 1315:             El = mongoose_acc:element(Acc),
 1316:             FilterText =/= exml_query:path(El, [{element, <<"body">>}, cdata]);
 1317:         _ ->
 1318:             true
 1319:     end.
 1320: 
 1321: is_chat(Content) ->
 1322:     fun(Stanza) -> escalus_pred:is_chat_message(Content, Stanza) end.
 1323: 
 1324: is_presence(Type) ->
 1325:     fun(Stanza) -> escalus_pred:is_presence_with_type(Type, Stanza) end.
 1326: 
 1327: three_texts() ->
 1328:     [<<"msg-1">>, <<"msg-2">>, <<"msg-3">>].
 1329: 
 1330: get_stanzas_filtered_by_mod_ping() ->
 1331:     History = rpc(mim(), meck, history, [mod_ping]),
 1332:     [Stanza ||
 1333:         {_Pid,
 1334:          {_Mod,
 1335:           filter_local_packet = _Func,
 1336:           [{_, _, _, Stanza} = _Acc, _Params, _Extra] = _Args
 1337:          },
 1338:          {stop, drop} = _Result
 1339:         } <- History
 1340:     ].
 1341: %%--------------------------------------------------------------------
 1342: %% IQ handler necessary for reproducing "replies_are_processed_by_resumed_session"
 1343: %%--------------------------------------------------------------------
 1344: 
 1345: regression_ns() ->
 1346:     <<"regression">>.
 1347: 
 1348: register_handler() ->
 1349:     HostType = host_type(),
 1350:     rpc(mim(), gen_iq_handler, add_iq_handler_for_domain,
 1351:         [HostType, regression_ns(), ejabberd_sm,
 1352:          fun ?MODULE:regression_handler/5, #{}, one_queue]).
 1353: 
 1354: unregister_handler() ->
 1355:     HostType = host_type(),
 1356:     rpc(mim(), gen_iq_handler, remove_iq_handler_for_domain,
 1357:         [HostType, regression_ns(), ejabberd_sm]).
 1358: 
 1359: regression_handler(Acc, _From, _To, IQ, _Extra) ->
 1360:     %% A bit of a hack - will no longer work when the SID format changes
 1361:     {_, Pid} = mongoose_acc:get(c2s, origin_sid, undefined, Acc),
 1362:     erlang:monitor(process, Pid),
 1363:     receive
 1364:         {'DOWN', _, _, _, _} ->
 1365:             ok
 1366:     after
 1367:         10000 ->
 1368:             error({c2s_not_stopped_after_timeout, Pid})
 1369:     end,
 1370:     %% We avoid another race condition - there is a short window where user session
 1371:     %% is not registered in ejabberd_sm: between old process termination and the moment
 1372:     %% when the new process stores new session in memory. It should be fixed separately.
 1373:     wait_for_session(mongoose_acc:get(c2s, origin_jid, undefined, Acc), 50, 100),
 1374:     {Acc, jlib:make_result_iq_reply(IQ)}.
 1375: 
 1376: wait_for_session(JID, Retries, SleepTime) ->
 1377:     case ejabberd_sm:get_session(JID) of
 1378:         offline ->
 1379:             timer:sleep(SleepTime),
 1380:             wait_for_session(JID, Retries - 1, SleepTime);
 1381:         _ ->
 1382:             ok
 1383:     end.
 1384: 
 1385: maybe_ack_initial_presence(Alice, ack) ->
 1386:     ack_initial_presence(Alice);
 1387: maybe_ack_initial_presence(_Alice, no_ack) ->
 1388:     ok.