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machi/test/machi_chain_manager1_test.erl
Scott Lystig Fritchie c49ccafdc6 Merge slf/flu-config-rcd-style
2015-12-18 15:41:02 +09:00

546 lines
22 KiB
Erlang
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%% -------------------------------------------------------------------
%%
%% Machi: a small village of replicated files
%%
%% Copyright (c) 2014 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------
-module(machi_chain_manager1_test).
-include("machi.hrl").
-include("machi_projection.hrl").
-define(MGR, machi_chain_manager1).
-define(D(X), io:format(user, "~s ~p\n", [??X, X])).
-define(Dw(X), io:format(user, "~s ~w\n", [??X, X])).
-define(FLU_C, machi_flu1_client).
-define(FLU_PC, machi_proxy_flu1_client).
-export([]).
-ifdef(TEST).
-ifdef(EQC).
-include_lib("eqc/include/eqc.hrl").
%% -include_lib("eqc/include/eqc_statem.hrl").
-define(QC_OUT(P),
eqc:on_output(fun(Str, Args) -> io:format(user, Str, Args) end, P)).
-endif.
-include_lib("eunit/include/eunit.hrl").
-compile(export_all).
%% @doc Create a summary report of all of the *private* projections of
%% each of the FLUs in the chain, and create a summary for each
%% epoch number.
%%
%% Report format: list({EpochNumber:non_neg_integer(), Report:rpt()})
%% rpt(): {'ok_disjoint', unique_upi_repair_lists()} |
%% {'bummer_NOT_DISJOINT', {flat(), summaries()}
%% unique_upi_repair_lists(): list(upi_and_repair_lists_concatenated())
%% flat(): debugging term; any duplicate in this list is an invalid FLU.
%% summaries(): list({FLU, ProjectionSummary:string() | 'not_in_this_epoch'})
%%
%% Example:
%%
%% [{1,{ok_disjoint,[[a,b,c]]}},
%% {4,{ok_disjoint,[[a,b,c]]}},
%% {6,{ok_disjoint,[[a,b,c]]}},
%% {16,{ok_disjoint,[[a,b,c]]}},
%% {22,{ok_disjoint,[[b]]}},
%% {1174,
%% {bummer_NOT_DISJOINT,{[a,a,b],
%% [{a,"[{epoch,1174},{author,a},{upi,[a]},{repair,[]},{down,[b]},{d,[{ps,[{a,b},{b,a}]},{nodes_up,[a]}]},{d2,[]}]"},
%% {b,"[{epoch,1174},{author,b},{upi,[b]},{repair,[a]},{down,[]},{d,[{ps,[]},{nodes_up,[a,b]}]},{d2,[]}]"}]}}},
%% ...]
unanimous_report(Namez) ->
UniquePrivateEs =
lists:usort(lists:flatten(
[element(2, ?FLU_PC:list_all_projections(FLU, private)) ||
{_FLUName, FLU} <- Namez])),
[{Epoch, unanimous_report(Epoch, Namez)} || Epoch <- UniquePrivateEs,
Epoch /= 0].
unanimous_report(Epoch, Namez) ->
FLU_Projs = [{FLUName,
case ?FLU_PC:read_projection(FLU, private, Epoch) of
{ok, T} ->
T;
_Else ->
not_in_this_epoch
end} || {FLUName, FLU} <- Namez],
unanimous_report2(FLU_Projs).
unanimous_report2(FLU_Projs) ->
ProjsSumms = [{FLU, if is_tuple(P) ->
Summ = machi_projection:make_summary(P),
lists:flatten(io_lib:format("~w", [Summ]));
is_atom(P) ->
P
end} || {FLU, P} <- FLU_Projs],
UPI_R_Sums = [{Proj#projection_v1.upi, Proj#projection_v1.repairing,
Proj#projection_v1.epoch_csum} ||
{_FLUname, Proj} <- FLU_Projs,
is_record(Proj, projection_v1)],
UniqueUPIs = lists:usort([UPI || {UPI, _Repairing, _CSum} <- UPI_R_Sums]),
if length(UniqueUPIs) =< 1 ->
{ok_disjoint, UniqueUPIs};
true ->
Flat = lists:flatten(UniqueUPIs),
case lists:usort(Flat) == lists:sort(Flat) of
true ->
{ok_disjoint, UniqueUPIs};
false ->
{bummer_NOT_DISJOINT, {lists:sort(Flat), ProjsSumms}}
end
end.
all_reports_are_disjoint(Report) ->
case [X || {_Epoch, Tuple}=X <- Report,
element(1, Tuple) /= ok_disjoint] of
[] ->
true;
Else ->
Else
end.
-ifndef(PULSE).
simple_chain_state_transition_is_sane_test_() ->
{timeout, 60, fun() -> simple_chain_state_transition_is_sane_test2() end}.
simple_chain_state_transition_is_sane_test2() ->
%% All: A list of all FLUS for a particular test
%% UPI1: some combination of All that represents UPI1
%% Repair1: Some combination of (All -- UP1) that represents Repairing1
%% ... then we test check_simple_chain_state_transition_is_sane() with all
%% possible UPI1 and Repair1.
[true = check_simple_chain_state_transition_is_sane(UPI1, Repair1) ||
%% The five elements below runs on my MacBook Pro in about 4.8 seconds
%% All <- [ [a], [a,b], [a,b,c], [a,b,c,d], [a,b,c,d,e] ],
%% For elements on the same MBP is about 0.15 seconds.
All <- [ [a], [a,b], [a,b,c], [a,b,c,d] ],
UPI1 <- machi_util:combinations(All),
Repair1 <- machi_util:combinations(All -- UPI1)].
%% Given a UPI1 and Repair1 list, we calculate all possible good UPI2
%% lists. For all good {UPI1, Repair1} -> UPI2 transitions, then the
%% simple_chain_state_transition_is_sane() function must be true. For
%% all other UPI2 transitions, simple_chain_state_transition_is_sane()
%% must be false.
%%
%% We include adding an extra possible participant, 'bogus', to the
%% list of all possible UPI2 transitions, just to demonstrate that
%% adding an extra element/participant/thingie is never sane.
check_simple_chain_state_transition_is_sane([], []) ->
true;
check_simple_chain_state_transition_is_sane(UPI1, Repair1) ->
Good_UPI2s = [ X ++ Y || X <- machi_util:ordered_combinations(UPI1),
Y <- machi_util:ordered_combinations(Repair1)],
All_UPI2s = machi_util:combinations(lists:usort(UPI1 ++ Repair1) ++
[bogus]),
[true = ?MGR:simple_chain_state_transition_is_sane(UPI1, Repair1, UPI2) ||
UPI2 <- Good_UPI2s],
[false = ?MGR:simple_chain_state_transition_is_sane(UPI1, Repair1, UPI2) ||
UPI2 <- (All_UPI2s -- Good_UPI2s)],
true.
-ifdef(EQC).
%% This QuickCheck property is crippled: because the old chain state
%% transition check, chain_mgr_legacy:projection_transition_is_sane(),
%% is so buggy and the new check is (apparently) so much better, I
%% have changed the ?WHENFAIL() criteria to check for either agreement
%% _or_ a case where the legacy check says true but the new check says
%% false.
%%
%% On my MacBook Pro, less than 1000 tests are required to find at
%% least one problem case for the legacy check that the new check is
%% correct for. Running for two seconds can do about 3,500 test
%% cases.
compare_eqc_setup_test_() ->
%% Silly QuickCheck can take a long time to start up, check its
%% license, etcetc.
%% machi_chain_manager1_test: compare_eqc_setup_test...[1.788 s] ok
{timeout, 30,
fun() -> eqc:quickcheck(eqc:testing_time(0.1, true)) end}.
-define(COMPARE_TIMEOUT, 1.2).
%% -define(COMPARE_TIMEOUT, 4.8).
compare_legacy_with_v2_chain_transition_check1_test() ->
eqc:quickcheck(
?QC_OUT(
eqc:testing_time(
?COMPARE_TIMEOUT,
prop_compare_legacy_with_v2_chain_transition_check(primitive)))).
compare_legacy_with_v2_chain_transition_check2_test() ->
eqc:quickcheck(
?QC_OUT(
eqc:testing_time(
?COMPARE_TIMEOUT,
prop_compare_legacy_with_v2_chain_transition_check(primitive)))).
prop_compare_legacy_with_v2_chain_transition_check() ->
prop_compare_legacy_with_v2_chain_transition_check(primitive).
prop_compare_legacy_with_v2_chain_transition_check(Style) ->
%% ?FORALL(All, nonempty(list([a,b,c,d,e])),
?FORALL(All, non_empty(some([a,b,c,d])),
?FORALL({Author1, UPI1, Repair1x, Author2, UPI2, Repair2x},
{elements(All),some(All),some(All),elements(All),some(All),some(All)},
?IMPLIES(length(lists:usort(UPI1 ++ Repair1x)) > 0 andalso
length(lists:usort(UPI2 ++ Repair2x)) > 0,
begin
MembersDict = orddict:from_list([{X, #p_srvr{name=X}} || X <- All]),
Repair1 = Repair1x -- UPI1,
Down1 = All -- (UPI1 ++ Repair1),
Repair2 = Repair2x -- UPI2,
Down2 = All -- (UPI2 ++ Repair2),
P1 = machi_projection:new(1, Author1, MembersDict,
Down1, UPI1, Repair1, []),
P2 = machi_projection:new(2, Author2, MembersDict,
Down2, UPI2, Repair2, []),
Old_res = chain_mgr_legacy:projection_transition_is_sane(
P1, P2, Author1, false),
Old_p = case Old_res of true -> true;
_ -> false
end,
case Style of
primitive ->
New_res = ?MGR:chain_state_transition_is_sane(
Author1, UPI1, Repair1, Author2, UPI2, Author2),
New_p = case New_res of true -> true;
_ -> false
end;
whole ->
New_res = machi_chain_manager1:projection_transition_is_sane(
P1, P2, Author1, false),
New_p = case New_res of true -> true;
_ -> false
end
end,
(catch ets:insert(count,
{{Author1, UPI1, Repair1, Author2, UPI2, Repair2}, true})),
?WHENFAIL(io:format(user,
"Old_res: ~p/~p (~p)\nNew_res: ~p/~p (why line ~P)\n",
[Old_p, Old_res, catch get(why1),
New_p, New_res, catch get(why2), 30]),
%% Old_p == New_p)
Old_p == New_p orelse (Old_p == true andalso New_p == false))
end))).
some(L) ->
?LET(L2, list(oneof(L)),
dedupe(L2)).
dedupe(L) ->
dedupe(L, []).
dedupe([H|T], Seen) ->
case lists:member(H, Seen) of
false ->
[H|dedupe(T, [H|Seen])];
true ->
dedupe(T, Seen)
end;
dedupe([], _) ->
[].
make_prop_ets() ->
ets:new(count, [named_table, set, public]).
-endif. % EQC
make_advance_fun(FitList, FLUList, MgrList, Num) ->
fun() ->
[begin
[catch machi_fitness:trigger_early_adjustment(Fit, Tgt) ||
Fit <- FitList,
Tgt <- FLUList ],
[catch ?MGR:trigger_react_to_env(Mgr) || Mgr <- MgrList],
ok
end || _ <- lists:seq(1, Num)]
end.
smoke0_test() ->
TcpPort = 6623,
{[Pa], [M0], _Dirs} = machi_test_util:start_flu_packages(
1, TcpPort, "./data.", []),
{ok, FLUaP} = ?FLU_PC:start_link(Pa),
try
pong = ?MGR:ping(M0)
after
ok = ?FLU_PC:quit(FLUaP),
machi_test_util:stop_flu_packages()
end.
smoke1_test_() ->
{timeout, 1*60, fun() -> smoke1_test2() end}.
smoke1_test2() ->
TcpPort = 62777,
MgrOpts = [{active_mode,false}],
try
{Ps, MgrNames, _Dirs} = machi_test_util:start_flu_packages(
3, TcpPort, "./data.", MgrOpts),
MembersDict = machi_projection:make_members_dict(Ps),
[machi_chain_manager1:set_chain_members(M, MembersDict) || M <- MgrNames],
Ma = hd(MgrNames),
{ok, P1} = ?MGR:test_calc_projection(Ma, false),
% DERP! Check for race with manager's proxy vs. proj listener
ok = lists:foldl(
fun(_, {_,{true,[{c,ok},{b,ok},{a,ok}]}}) ->
ok; % Short-circuit remaining attempts
(_, ok) ->
ok; % Skip remaining!
(_, _Else) ->
timer:sleep(10),
?MGR:test_write_public_projection(Ma, P1)
end, not_ok, lists:seq(1, 1000)),
%% Writing the exact same projection multiple times returns ok:
%% no change!
{_,{true,[{c,ok},{b,ok},{a,ok}]}} = ?MGR:test_write_public_projection(Ma, P1),
{unanimous, P1, Extra1} = ?MGR:test_read_latest_public_projection(Ma, false),
ok
after
machi_test_util:stop_flu_packages()
end.
nonunanimous_setup_and_fix_test_() ->
os:cmd("rm -f /tmp/moomoo.*"),
{timeout, 1*60, fun() -> nonunanimous_setup_and_fix_test2() end}.
nonunanimous_setup_and_fix_test2() ->
TcpPort = 62877,
MgrOpts = [{active_mode,false}],
{Ps, [Ma,Mb,Mc], Dirs} = machi_test_util:start_flu_packages(
3, TcpPort, "./data.", MgrOpts),
MembersDict = machi_projection:make_members_dict(Ps),
ChainName = my_little_chain,
[machi_chain_manager1:set_chain_members(M, ChainName, 0, ap_mode,
MembersDict, []) || M <- [Ma, Mb]],
[Proxy_a, Proxy_b, Proxy_c] = Proxies =
[element(2, ?FLU_PC:start_link(P)) || P <- Ps],
try
{ok, P1} = ?MGR:test_calc_projection(Ma, false),
P1a = machi_projection:update_checksum(
P1#projection_v1{down=[b], upi=[a], dbg=[{hackhack, ?LINE}]}),
P1b = machi_projection:update_checksum(
P1#projection_v1{author_server=b, creation_time=now(),
down=[a], upi=[b], dbg=[{hackhack, ?LINE}]}),
%% Scribble different projections
ok = ?FLU_PC:write_projection(Proxy_a, public, P1a),
ok = ?FLU_PC:write_projection(Proxy_b, public, P1b),
%% ?D(x),
{not_unanimous,_,_}=_XX = ?MGR:test_read_latest_public_projection(
Ma, false),
%% ?Dw(_XX),
{not_unanimous,_,_}=_YY = ?MGR:test_read_latest_public_projection(
Ma, true),
%% The read repair here doesn't automatically trigger the creation of
%% a new projection (to try to create a unanimous projection). So
%% we expect nothing to change when called again.
{not_unanimous,_,_}=_YY = ?MGR:test_read_latest_public_projection(
Ma, true),
{now_using, _, EpochNum_a} = ?MGR:trigger_react_to_env(Ma),
{no_change, _, EpochNum_a} = ?MGR:trigger_react_to_env(Ma),
{unanimous,P2,_E2} = ?MGR:test_read_latest_public_projection(Ma, false),
{ok, P2pa} = ?FLU_PC:read_latest_projection(Proxy_a, private),
P2 = P2pa#projection_v1{dbg2=[]},
%% Poke FLUb to react ... should be using the same private proj
%% as FLUa.
{now_using, _, EpochNum_a} = ?MGR:trigger_react_to_env(Mb),
{ok, P2pb} = ?FLU_PC:read_latest_projection(Proxy_b, private),
P2 = P2pb#projection_v1{dbg2=[]},
Mgrs = [a_chmgr, b_chmgr, c_chmgr],
Advance = make_advance_fun([a_fitness,b_fitness,c_fitness],
[a,b,c],
Mgrs,
3),
Advance(),
{_, _, TheEpoch_3} = ?MGR:trigger_react_to_env(Ma),
{_, _, TheEpoch_3} = ?MGR:trigger_react_to_env(Mb),
{_, _, TheEpoch_3} = ?MGR:trigger_react_to_env(Mc),
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Remove 'a' from the chain.\n", []),
MembersDict4 = machi_projection:make_members_dict(tl(Ps)),
ok = machi_chain_manager1:set_chain_members(
Mb, ChainName, TheEpoch_3, ap_mode, MembersDict4, []),
Advance(),
{ok, {true, _}} = ?FLU_PC:wedge_status(Proxy_a),
{_, _, TheEpoch_4} = ?MGR:trigger_react_to_env(Mb),
{_, _, TheEpoch_4} = ?MGR:trigger_react_to_env(Mc),
[{ok, #projection_v1{upi=[b,c], repairing=[]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- tl(Proxies)],
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Add a to the chain again (a is running).\n", []),
MembersDict5 = machi_projection:make_members_dict(Ps),
ok = machi_chain_manager1:set_chain_members(
Mb, ChainName, TheEpoch_4, ap_mode, MembersDict5, []),
Advance(),
{_, _, TheEpoch_5} = ?MGR:trigger_react_to_env(Ma),
{_, _, TheEpoch_5} = ?MGR:trigger_react_to_env(Mb),
{_, _, TheEpoch_5} = ?MGR:trigger_react_to_env(Mc),
[{ok, #projection_v1{upi=[b,c], repairing=[a]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- Proxies],
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Stop a while a chain member, advance b&c.\n", []),
ok = machi_flu_psup:stop_flu_package(a),
Advance(),
{_, _, TheEpoch_6} = ?MGR:trigger_react_to_env(Mb),
{_, _, TheEpoch_6} = ?MGR:trigger_react_to_env(Mc),
[{ok, #projection_v1{upi=[b,c], repairing=[]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- tl(Proxies)],
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Remove 'a' from the chain.\n", []),
MembersDict7 = machi_projection:make_members_dict(tl(Ps)),
ok = machi_chain_manager1:set_chain_members(
Mb, ChainName, TheEpoch_6, ap_mode, MembersDict7, []),
Advance(),
{_, _, TheEpoch_7} = ?MGR:trigger_react_to_env(Mb),
{_, _, TheEpoch_7} = ?MGR:trigger_react_to_env(Mc),
[{ok, #projection_v1{upi=[b,c], repairing=[]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- tl(Proxies)],
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Start a, advance.\n", []),
Opts = [{active_mode, false}, {initial_wedged, true}],
#p_srvr{name=NameA} = hd(Ps),
{ok,_}=machi_flu_psup:start_flu_package(NameA, TcpPort+1, hd(Dirs), Opts),
Advance(),
{ok, {true, _}} = ?FLU_PC:wedge_status(Proxy_a),
{ok, {false, EpochID_8}} = ?FLU_PC:wedge_status(Proxy_b),
{ok, {false, EpochID_8}} = ?FLU_PC:wedge_status(Proxy_c),
[{ok, #projection_v1{upi=[b,c], repairing=[]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- tl(Proxies)],
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Stop a, delete a's data, leave it stopped\n", []),
ok = machi_flu_psup:stop_flu_package(a),
Advance(),
machi_flu1_test:clean_up_data_dir(hd(Dirs)),
{ok, {false, _}} = ?FLU_PC:wedge_status(Proxy_b),
{ok, {false, _}} = ?FLU_PC:wedge_status(Proxy_c),
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Add a to the chain again (a is stopped).\n", []),
MembersDict9 = machi_projection:make_members_dict(Ps),
{_, _, TheEpoch_9} = ?MGR:trigger_react_to_env(Mb),
ok = machi_chain_manager1:set_chain_members(
Mb, ChainName, TheEpoch_9, ap_mode, MembersDict9, []),
Advance(),
{_, _, TheEpoch_9b} = ?MGR:trigger_react_to_env(Mb),
true = (TheEpoch_9b > TheEpoch_9),
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
io:format("STEP: Start a, and it joins like it ought to\n", []),
{ok,_}=machi_flu_psup:start_flu_package(NameA, TcpPort+1, hd(Dirs), Opts),
Advance(),
{ok, {false, {TheEpoch10,_}}} = ?FLU_PC:wedge_status(Proxy_a),
{ok, {false, {TheEpoch10,_}}} = ?FLU_PC:wedge_status(Proxy_b),
{ok, {false, {TheEpoch10,_}}} = ?FLU_PC:wedge_status(Proxy_c),
[{ok, #projection_v1{upi=[b,c], repairing=[a]}} =
?FLU_PC:read_latest_projection(Pxy, private) || Pxy <- Proxies],
ok
after
[ok = ?FLU_PC:quit(X) || X <- Proxies],
machi_test_util:stop_flu_packages()
end.
unanimous_report_test() ->
TcpPort = 63877,
FluInfo = [{a,TcpPort+0,"./data.a"}, {b,TcpPort+1,"./data.b"}],
P_s = [#p_srvr{name=Name, address="localhost", port=Port} ||
{Name,Port,_Dir} <- FluInfo],
MembersDict = machi_projection:make_members_dict(P_s),
E5 = 5,
UPI5 = [a,b],
Rep5 = [],
Report5 = [UPI5],
P5 = machi_projection:new(E5, a, MembersDict, [], UPI5, Rep5, []),
{ok_disjoint, Report5} =
unanimous_report2([{a, P5}, {b, P5}]),
{ok_disjoint, Report5} =
unanimous_report2([{a, not_in_this_epoch}, {b, P5}]),
{ok_disjoint, Report5} =
unanimous_report2([{a, P5}, {b, not_in_this_epoch}]),
UPI5_b = [a],
Rep5_b = [],
P5_b = machi_projection:new(E5, b, MembersDict, [b], UPI5_b, Rep5_b, []),
{bummer_NOT_DISJOINT, _} = unanimous_report2([{a, P5}, {b, P5_b}]),
UPI5_c = [b],
Rep5_c = [a],
P5_c = machi_projection:new(E5, b, MembersDict, [], UPI5_c, Rep5_c, []),
{bummer_NOT_DISJOINT, _} =
unanimous_report2([{a, P5}, {b, P5_c}]),
P_s3 = [#p_srvr{name=Name, address="localhost", port=Port} ||
{Name,Port,_Dir} <- FluInfo ++ [{c,TcpPort+0,"./data.c"}]],
MembersDict3 = machi_projection:make_members_dict(P_s3),
UPI5_d = [c],
Rep5_d = [a],
Report5d = [UPI5, UPI5_d],
P5_d = machi_projection:new(E5, b, MembersDict3, [b], UPI5_d, Rep5_d, []),
{ok_disjoint, Report5d} = unanimous_report2([{a, P5}, {b, P5_d}]),
UPI5_e = [b],
Rep5_e = [c],
Report5be = [UPI5_b, UPI5_e],
P5_e = machi_projection:new(E5, b, MembersDict3, [a], UPI5_e, Rep5_e, []),
{bummer_NOT_DISJOINT, _} = unanimous_report2([{a, P5}, {b, P5_e}]),
{ok_disjoint, Report5be} = unanimous_report2([{a, P5_b}, {b, P5_e}]),
ok.
-endif. % !PULSE
-endif. % TEST
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