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%% ``The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved via the world wide web at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% The Initial Developer of the Original Code is Ericsson Utvecklings AB.
%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings
%% AB. All Rights Reserved.''
%%
%% @author Ulf Wiger <ulf.wiger@erlang-solutions.com>
%%
-module(gproc_dist_tests).
-ifdef(TEST).
-include_lib("eunit/include/eunit.hrl").
-export([t_spawn/1, t_spawn_reg/2]).
dist_test_() ->
{timeout, 120,
[{setup,
fun() ->
Ns = start_slaves([dist_test_n1, dist_test_n2]),
?assertMatch({[ok,ok],[]},
rpc:multicall(Ns, application, set_env,
[gproc, gproc_dist, Ns])),
?assertMatch({[ok,ok],[]},
rpc:multicall(Ns, application, start, [gproc])),
Ns
end,
fun(Ns) ->
[rpc:call(N, init, stop, []) || N <- Ns]
end,
fun(Ns) ->
{inorder,
[
{inparallel, [
fun() ->
?debugVal(t_simple_reg(Ns))
end,
fun() ->
?debugVal(t_simple_reg_or_locate(Ns))
end,
fun() ->
?debugVal(t_simple_counter(Ns))
end,
fun() ->
?debugVal(t_aggr_counter(Ns))
end,
fun() ->
?debugVal(t_update_counters(Ns))
end,
fun() ->
?debugVal(t_shared_counter(Ns))
end,
fun() ->
?debugVal(t_mreg(Ns))
end,
fun() ->
?debugVal(t_await_reg(Ns))
end,
fun() ->
?debugVal(t_await_self(Ns))
end,
fun() ->
?debugVal(t_await_reg_exists(Ns))
end,
fun() ->
?debugVal(t_give_away(Ns))
end,
fun() ->
?debugVal(t_sync(Ns))
end,
fun() ->
?debugVal(t_monitor(Ns))
end,
fun() ->
?debugVal(t_subscribe(Ns))
end
]
},
fun() ->
?debugVal(t_sync_cand_dies(Ns))
end,
{timeout, 90, [fun() ->
?debugVal(t_fail_node(Ns))
end]}
]}
end
}]}.
-define(T_NAME, {n, g, {?MODULE, ?LINE}}).
-define(T_KVL, [{foo, "foo"}, {bar, "bar"}]).
-define(T_COUNTER, {c, g, {?MODULE, ?LINE}}).
t_simple_reg([H|_] = Ns) ->
Name = ?T_NAME,
P = t_spawn_reg(H, Name),
?assertMatch(ok, t_lookup_everywhere(Name, Ns, P)),
?assertMatch(true, t_call(P, {apply, gproc, unreg, [Name]})),
?assertMatch(ok, t_lookup_everywhere(Name, Ns, undefined)),
?assertMatch(ok, t_call(P, die)).
t_simple_reg_or_locate([A,B|_] = _Ns) ->
Name = ?T_NAME,
P1 = t_spawn(A),
_Ref = erlang:monitor(process, P1),
?assertMatch({P1, the_value},
t_call(P1, {apply, gproc, reg_or_locate, [Name, the_value]})),
P2 = t_spawn(B),
_Ref2 = erlang:monitor(process, P2),
?assertMatch({P1, the_value},
t_call(P2, {apply, gproc, reg_or_locate, [Name, other_value]})),
?assertMatch(ok, t_call(P1, die)),
?assertMatch(ok, t_call(P2, die)).
t_simple_counter([H|_] = Ns) ->
Ctr = ?T_COUNTER,
P = t_spawn_reg(H, Ctr, 3),
?assertMatch(ok, t_read_everywhere(Ctr, P, Ns, 3)),
?assertMatch(5, t_call(P, {apply, gproc, update_counter, [Ctr, 2]})),
?assertMatch(ok, t_read_everywhere(Ctr, P, Ns, 5)),
?assertMatch(ok, t_call(P, die)).
t_shared_counter([H|_] = Ns) ->
Ctr = ?T_COUNTER,
P = t_spawn_reg_shared(H, Ctr, 3),
?assertMatch(ok, t_read_everywhere(Ctr, shared, Ns, 3)),
?assertMatch(5, t_call(P, {apply, gproc, update_shared_counter, [Ctr, 2]})),
?assertMatch(ok, t_read_everywhere(Ctr, shared, Ns, 5)),
?assertMatch(ok, t_call(P, die)),
?assertMatch(ok, t_read_everywhere(Ctr, shared, Ns, 5)),
?assertMatch(ok, t_read_everywhere(Ctr, shared, Ns, 5)), % twice
P1 = t_spawn(H),
?assertMatch(true, t_call(P1, {apply, gproc, unreg_shared, [Ctr]})),
?assertMatch(ok, t_read_everywhere(Ctr, shared, Ns, badarg)).
t_aggr_counter([H1,H2|_] = Ns) ->
{c,g,Nm} = Ctr = ?T_COUNTER,
Aggr = {a,g,Nm},
Pc1 = t_spawn_reg(H1, Ctr, 3),
Pa = t_spawn_reg(H2, Aggr),
?assertMatch(ok, t_read_everywhere(Ctr, Pc1, Ns, 3)),
?assertMatch(ok, t_read_everywhere(Aggr, Pa, Ns, 3)),
Pc2 = t_spawn_reg(H2, Ctr, 3),
?assertMatch(ok, t_read_everywhere(Ctr, Pc2, Ns, 3)),
?assertMatch(ok, t_read_everywhere(Aggr, Pa, Ns, 6)),
?assertMatch(5, t_call(Pc1, {apply, gproc, update_counter, [Ctr, 2]})),
?assertMatch(ok, t_read_everywhere(Ctr, Pc1, Ns, 5)),
?assertMatch(ok, t_read_everywhere(Aggr, Pa, Ns, 8)),
?assertMatch(ok, t_call(Pc1, die)),
?assertMatch(ok, t_read_everywhere(Aggr, Pa, Ns, 3)),
?assertMatch(ok, t_call(Pc2, die)),
?assertMatch(ok, t_call(Pa, die)).
t_update_counters([H1,H2|_] = Ns) ->
{c,g,N1} = C1 = ?T_COUNTER,
A1 = {a,g,N1},
C2 = ?T_COUNTER,
P1 = t_spawn_reg(H1, C1, 2),
P12 = t_spawn_reg(H2, C1, 2),
P2 = t_spawn_reg(H2, C2, 1),
Pa1 = t_spawn_reg(H2, A1),
?assertMatch(ok, t_read_everywhere(C1, P1, Ns, 2)),
?assertMatch(ok, t_read_everywhere(C1, P12, Ns, 2)),
?assertMatch(ok, t_read_everywhere(C2, P2, Ns, 1)),
?assertMatch(ok, t_read_everywhere(A1, Pa1, Ns, 4)),
?debugFmt("code:which(gproc_dist) = ~p~n", [code:which(gproc_dist)]),
?assertMatch([{C1,P1, 3},
{C1,P12,4},
{C2,P2, 0}], t_call(P1, {apply, gproc, update_counters,
[g, [{C1,P1,1},{C1,P12,2},{C2,P2,{-2,0,0}}]]})),
?assertMatch(ok, t_read_everywhere(C1, P1, Ns, 3)),
?assertMatch(ok, t_read_everywhere(C1, P12, Ns, 4)),
?assertMatch(ok, t_read_everywhere(C2, P2, Ns, 0)),
?assertMatch(ok, t_read_everywhere(A1, Pa1, Ns, 7)),
?assertMatch(ok, t_call(P1, die)),
?assertMatch(ok, t_call(P12, die)),
?assertMatch(ok, t_call(P2, die)).
t_mreg([H|_] = Ns) ->
Kvl = ?T_KVL,
Keys = [K || {K,_} <- Kvl],
P = t_spawn_mreg(H, Kvl),
[?assertMatch(ok, t_lookup_everywhere({n,g,K}, Ns, P)) || K <- Keys],
?assertMatch(true, t_call(P, {apply, gproc, munreg, [n, g, Keys]})),
[?assertMatch(ok, t_lookup_everywhere({n,g,K},Ns,undefined)) || K <- Keys],
?assertMatch(ok, t_call(P, die)).
t_await_reg([A,B|_]) ->
Name = ?T_NAME,
P = t_spawn(A),
Ref = erlang:monitor(process, P),
P ! {self(), Ref, {apply, gproc, await, [Name]}},
t_sleep(),
P1 = t_spawn_reg(B, Name),
?assert(P1 == receive
{P, Ref, Res} ->
element(1, Res);
{'DOWN', Ref, _, _, Reason} ->
erlang:error(Reason);
Other ->
erlang:error({received,Other})
end),
?assertMatch(ok, t_call(P, die)),
?assertMatch(ok, t_call(P1, die)).
t_await_self([A|_]) ->
Name = ?T_NAME,
P = t_spawn(A, false), % don't buffer unknowns
Ref = t_call(P, {apply, gproc, nb_wait, [Name]}),
?assertMatch(ok, t_call(P, {selective, true})),
?assertMatch(true, t_call(P, {apply, gproc, reg, [Name, some_value]})),
?assertMatch({registered, {Name, P, some_value}},
t_call(P, {apply_fun, fun() ->
receive
{gproc, Ref, R, Wh} ->
{R, Wh}
after 10000 ->
timeout
end
end})),
?assertMatch(ok, t_call(P, {selective, false})),
?assertMatch(true, t_call(P, {apply, gproc, unreg, [Name]})).
t_await_reg_exists([A,B|_]) ->
Name = ?T_NAME,
P = t_spawn(A),
Ref = erlang:monitor(process, P),
P1 = t_spawn_reg(B, Name),
P ! {self(), Ref, {apply, gproc, await, [Name]}},
?assert(P1 == receive
{P, Ref, Res} ->
element(1, Res);
{'DOWN', Ref, _, _, Reason} ->
erlang:error(Reason);
Other ->
erlang:error({received,Other})
end),
?assertMatch(ok, t_call(P, die)),
?assertMatch(ok, t_call(P1, die)).
t_give_away([A,B|_] = Ns) ->
Na = ?T_NAME,
Nb = ?T_NAME,
Pa = t_spawn_reg(A, Na),
Pb = t_spawn_reg(B, Nb),
?assertMatch(ok, t_lookup_everywhere(Na, Ns, Pa)),
?assertMatch(ok, t_lookup_everywhere(Nb, Ns, Pb)),
?assertMatch(Pb, t_call(Pa, {apply, gproc, give_away, [Na, Nb]})),
?assertMatch(ok, t_lookup_everywhere(Na, Ns, Pb)),
?assertMatch(Pa, t_call(Pb, {apply, gproc, give_away, [Na, Pa]})),
?assertMatch(ok, t_lookup_everywhere(Na, Ns, Pa)),
?assertMatch(ok, t_call(Pa, die)),
?assertMatch(ok, t_call(Pb, die)).
t_sync(Ns) ->
%% Don't really know how to test this...
[?assertMatch(true, rpc:call(N, gproc_dist, sync, []))
|| N <- Ns].
t_monitor([A,B|_]) ->
Na = ?T_NAME,
Pa = t_spawn_reg(A, Na),
Pb = t_spawn(B, _Selective = true),
Ref = t_call(Pb, {apply, gproc, monitor, [Na]}),
?assert(is_reference(Ref)),
?assertMatch(ok, t_call(Pa, die)),
?assertMatch({gproc,unreg,Ref,Na}, got_msg(Pb, gproc)),
Pc = t_spawn_reg(A, Na),
Ref1 = t_call(Pb, {apply, gproc, monitor, [Na]}),
?assertMatch(true, t_call(Pc, {apply, gproc, unreg, [Na]})),
?assertMatch({gproc,unreg,Ref1,Na}, got_msg(Pb, gproc)).
t_subscribe([A,B|_] = Ns) ->
Na = ?T_NAME,
Pb = t_spawn(B, _Selective = true),
?assertEqual(ok, t_call(Pb, {apply, gproc_monitor, subscribe, [Na]})),
?assertMatch({gproc_monitor, Na, undefined}, got_msg(Pb, gproc_monitor)),
Pa = t_spawn_reg(A, Na),
?assertMatch({gproc_monitor, Na, Pa}, got_msg(Pb, gproc_monitor)),
Pc = t_spawn(A),
t_call(Pa, {apply, gproc, give_away, [Na, Pc]}),
?assertMatch(ok, t_lookup_everywhere(Na, Ns, Pc)),
?assertEqual({gproc_monitor,Na,{migrated,Pc}}, got_msg(Pb, gproc_monitor)),
?assertEqual(ok, t_call(Pc, die)),
?assertEqual({gproc_monitor,Na,undefined}, got_msg(Pb, gproc_monitor)).
got_msg(Pb, Tag) ->
t_call(Pb,
{apply_fun,
fun() ->
receive
M when element(1, M) == Tag ->
M
after 1000 ->
timeout
end
end}).
%% Verify that the gproc_dist:sync() call returns true even if a candidate dies
%% while the sync is underway. This test makes use of sys:suspend() to ensure that
%% the other candidate doesn't respond too quickly.
t_sync_cand_dies([A,B|_]) ->
Leader = rpc:call(A, gproc_dist, get_leader, []),
Other = case Leader of
A -> B;
B -> A
end,
?assertMatch(ok, rpc:call(Other, sys, suspend, [gproc_dist])),
P = rpc:call(Other, erlang, whereis, [gproc_dist]),
Key = rpc:async_call(Leader, gproc_dist, sync, []),
%% The overall timeout for gproc_dist:sync() is 5 seconds. Here, we should
%% still be waiting.
?assertMatch(timeout, rpc:nb_yield(Key, 1000)),
exit(P, kill),
%% The leader should detect that the other candidate died and respond
%% immediately. Therefore, we should have our answer well within 1 sec.
?assertMatch({value, true}, rpc:nb_yield(Key, 1000)).
t_fail_node([A,B|_] = Ns) ->
Na = ?T_NAME,
Nb = ?T_NAME,
Pa = t_spawn_reg(A, Na),
Pb = t_spawn_reg(B, Nb),
?assertMatch(ok, rpc:call(A, application, stop, [gproc])),
?assertMatch(ok, t_lookup_everywhere(Na, Ns -- [A], undefined)),
?assertMatch(ok, t_lookup_everywhere(Nb, Ns -- [A], Pb)),
?assertMatch(ok, rpc:call(A, application, start, [gproc])),
?assertMatch(ok, t_lookup_everywhere(Na, Ns, undefined)),
?assertMatch(ok, t_lookup_everywhere(Nb, Ns, Pb)),
?assertMatch(ok, t_call(Pa, die)),
?assertMatch(ok, t_call(Pb, die)).
t_sleep() ->
timer:sleep(500).
t_lookup_everywhere(Key, Nodes, Exp) ->
t_lookup_everywhere(Key, Nodes, Exp, 3).
t_lookup_everywhere(Key, _, Exp, 0) ->
{lookup_failed, Key, Exp};
t_lookup_everywhere(Key, Nodes, Exp, I) ->
Expected = [{N, Exp} || N <- Nodes],
Found = [{N,rpc:call(N, gproc, where, [Key])} || N <- Nodes],
if Expected =/= Found ->
?debugFmt("lookup ~p failed~n"
"(Expected: ~p;~n"
" Found : ~p), retrying...~n",
[Key, Expected, Found]),
t_sleep(),
t_lookup_everywhere(Key, Nodes, Exp, I-1);
true ->
ok
end.
t_read_everywhere(Key, Pid, Nodes, Exp) ->
t_read_everywhere(Key, Pid, Nodes, Exp, 3).
t_read_everywhere(Key, _, _, Exp, 0) ->
{read_failed, Key, Exp};
t_read_everywhere(Key, Pid, Nodes, Exp, I) ->
Expected = [{N, Exp} || N <- Nodes],
Found = [{N, read_result(rpc:call(N, gproc, get_value, [Key, Pid]))}
|| N <- Nodes],
if Expected =/= Found ->
?debugFmt("read ~p failed~n"
"(Expected: ~p;~n"
" Found : ~p), retrying...~n",
[{Key, Pid}, Expected, Found]),
t_sleep(),
t_read_everywhere(Key, Pid, Nodes, Exp, I-1);
true ->
ok
end.
read_result({badrpc, {'EXIT', {badarg, _}}}) -> badarg;
read_result(R) -> R.
t_spawn(Node) ->
t_spawn(Node, false).
t_spawn(Node, Selective) when is_boolean(Selective) ->
Me = self(),
P = spawn(Node, fun() ->
Me ! {self(), ok},
t_loop(Selective)
end),
receive
{P, ok} -> P
end.
t_spawn_reg(Node, Name) ->
t_spawn_reg(Node, Name, default_value(Name)).
t_spawn_reg(Node, Name, Value) ->
Me = self(),
spawn(Node, fun() ->
?assertMatch(true, gproc:reg(Name, Value)),
Me ! {self(), ok},
t_loop()
end),
receive
{P, ok} -> P
end.
t_spawn_reg_shared(Node, Name, Value) ->
Me = self(),
spawn(Node, fun() ->
?assertMatch(true, gproc:reg_shared(Name, Value)),
Me ! {self(), ok},
t_loop()
end),
receive
{P, ok} -> P
end.
default_value({c,_,_}) -> 0;
default_value(_) -> undefined.
t_spawn_mreg(Node, KVL) ->
Me = self(),
spawn(Node, fun() ->
?assertMatch(true, gproc:mreg(n, g, KVL)),
Me ! {self(), ok},
t_loop()
end),
receive
{P, ok} -> P
end.
t_call(P, Req) ->
Ref = erlang:monitor(process, P),
P ! {self(), Ref, Req},
receive
{P, Ref, Res} ->
erlang:demonitor(Ref),
Res;
{'DOWN', Ref, _, _, Error} ->
erlang:error({'DOWN', P, Error})
end.
t_loop() ->
t_loop(false).
t_loop(Selective) when is_boolean(Selective) ->
receive
{From, Ref, die} ->
From ! {self(), Ref, ok};
{From, Ref, {selective, Bool}} when is_boolean(Bool) ->
From ! {self(), Ref, ok},
t_loop(Bool);
{From, Ref, {apply, M, F, A}} ->
From ! {self(), Ref, apply(M, F, A)},
t_loop(Selective);
{From, Ref, {apply_fun, F}} ->
From ! {self(), Ref, F()},
t_loop(Selective);
Other when not Selective ->
?debugFmt("got unknown msg: ~p~n", [Other]),
exit({unknown_msg, Other})
end.
start_slaves(Ns) ->
[H|T] = Nodes = [start_slave(N) || N <- Ns],
_ = [rpc:call(H, net_adm, ping, [N]) || N <- T],
Nodes.
start_slave(Name) ->
case node() of
nonode@nohost ->
os:cmd("epmd -daemon"),
{ok, _} = net_kernel:start([gproc_master, shortnames]);
_ ->
ok
end,
{Pa, Pz} = paths(),
Paths = "-pa ./ -pz ../ebin" ++
lists:flatten([[" -pa " ++ Path || Path <- Pa],
[" -pz " ++ Path || Path <- Pz]]),
{ok, Node} = slave:start(host(), Name, Paths),
%% io:fwrite(user, "Slave node: ~p~n", [Node]),
Node.
paths() ->
Path = code:get_path(),
{ok, [[Root]]} = init:get_argument(root),
{Pas, Rest} = lists:splitwith(fun(P) ->
not lists:prefix(Root, P)
end, Path),
{_, Pzs} = lists:splitwith(fun(P) ->
lists:prefix(Root, P)
end, Rest),
{Pas, Pzs}.
host() ->
[_Name, Host] = re:split(atom_to_list(node()), "@", [{return, list}]),
list_to_atom(Host).
-endif.
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