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% Licensed 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(couch_views_server_test).
-include_lib("eunit/include/eunit.hrl").
-include_lib("fabric/test/fabric2_test.hrl").
couch_views_server_test_() ->
{
"Test couch_views_server",
{
setup,
fun setup/0,
fun cleanup/1,
{
foreach,
fun foreach_setup/0,
fun foreach_teardown/1,
[
?TDEF_FE(max_acceptors_started),
?TDEF_FE(acceptors_become_workers),
?TDEF_FE(handle_worker_death),
?TDEF_FE(handle_acceptor_death),
?TDEF_FE(handle_unknown_process_death),
?TDEF_FE(max_workers_limit_works),
?TDEF_FE(max_acceptors_greater_than_max_workers)
]
}
}
}.
setup() ->
Ctx = test_util:start_couch([
fabric,
couch_jobs,
js_engine,
couch_eval,
couch_lib
]),
Ctx.
cleanup(Ctx) ->
test_util:stop_couch(Ctx).
foreach_setup() ->
config:set("couch_views", "max_acceptors", "2", false),
config:set("couch_views", "max_workers", "4", false),
meck:new(couch_views_server, [passthrough]),
meck:new(couch_views_indexer, [passthrough]),
meck:expect(couch_views_indexer, init, fun() ->
receive
pls_accept -> ok
end,
couch_views_server:accepted(self()),
receive
pls_die -> ok
end
end),
ok = application:start(couch_views).
foreach_teardown(_) ->
ok = application:stop(couch_views),
meck:unload(),
config:delete("couch_views", "max_acceptors", false),
config:delete("couch_views", "max_workers", false),
ok.
max_acceptors_started(_) ->
#{max_acceptors := MaxAcceptors, max_workers := MaxWorkers} = get_state(),
?assertEqual(2, MaxAcceptors),
?assertEqual(4, MaxWorkers),
?assertEqual(0, maps:size(workers())),
[Pid1, Pid2] = maps:keys(acceptors()),
?assert(is_pid(Pid1)),
?assert(is_pid(Pid2)),
?assert(is_process_alive(Pid1)),
?assert(is_process_alive(Pid2)).
acceptors_become_workers(_) ->
?assertEqual(0, maps:size(workers())),
InitAcceptors = acceptors(),
accept_all(),
?assertEqual(2, maps:size(acceptors())),
?assertEqual(2, maps:size(workers())),
?assertEqual(InitAcceptors, workers()).
handle_worker_death(_) ->
[Pid1, Pid2] = maps:keys(acceptors()),
accept_all(),
% One worker exits normal
finish_normal([Pid1]),
?assertEqual(2, maps:size(acceptors())),
?assertEqual(1, maps:size(workers())),
% The other blows up with an error
finish_error([Pid2]),
?assertEqual(2, maps:size(acceptors())),
?assertEqual(0, maps:size(workers())).
handle_acceptor_death(_) ->
[Pid1, Pid2] = maps:keys(acceptors()),
finish_error([Pid1]),
NewAcceptors = acceptors(),
?assertEqual(2, maps:size(NewAcceptors)),
?assert(lists:member(Pid2, maps:keys(NewAcceptors))),
?assert(not lists:member(Pid1, maps:keys(NewAcceptors))).
handle_unknown_process_death(_) ->
meck:reset(couch_views_server),
Pid = self(),
whereis(couch_views_server) ! {'EXIT', Pid, blah},
meck:wait(
1,
couch_views_server,
terminate,
[{unknown_pid_exit, Pid}, '_'],
5000
).
max_workers_limit_works(_) ->
% Accept 2 jobs -> 2 workers
accept_all(),
?assertEqual(2, maps:size(workers())),
% Accept 2 more jobs -> 4 workers
accept_all(),
?assertEqual(0, maps:size(acceptors())),
?assertEqual(4, maps:size(workers())),
% Kill 1 worker -> 1 acceptor and 3 workers
[Worker1 | _] = maps:keys(workers()),
finish_normal([Worker1]),
?assertEqual(1, maps:size(acceptors())),
?assertEqual(3, maps:size(workers())),
% Kill 2 more workers -> 2 acceptors and 1 worker
[Worker2, Worker3 | _] = maps:keys(workers()),
finish_normal([Worker2, Worker3]),
?assertEqual(2, maps:size(acceptors())),
?assertEqual(1, maps:size(workers())),
% Kill 1 last worker -> 2 acceptors and 0 workers
[Worker4] = maps:keys(workers()),
finish_normal([Worker4]),
?assertEqual(2, maps:size(acceptors())),
?assertEqual(0, maps:size(workers())).
max_acceptors_greater_than_max_workers(_) ->
[Pid1, Pid2] = maps:keys(acceptors()),
sys:replace_state(couch_views_server, fun(#{} = St) ->
St#{max_workers := 1}
end),
accept_all(),
finish_normal([Pid1]),
finish_normal([Pid2]),
% Only 1 acceptor should start as it is effectively limited by max_workers
?assertEqual(1, maps:size(acceptors())),
?assertEqual(0, maps:size(workers())).
% Utility functions
accept_all() ->
Acceptors = acceptors(),
meck:reset(couch_views_server),
[Pid ! pls_accept || Pid <- maps:keys(Acceptors)],
meck:wait(maps:size(Acceptors), couch_views_server, handle_call, 3, 5000).
acceptors() ->
#{acceptors := Acceptors} = get_state(),
Acceptors.
workers() ->
#{workers := Workers} = get_state(),
Workers.
get_state() ->
sys:get_state(couch_views_server, infinity).
finish_normal(Workers) when is_list(Workers) ->
meck:reset(couch_views_server),
[Pid ! pls_die || Pid <- Workers],
meck:wait(
length(Workers),
couch_views_server,
handle_info,
[{'_', '_', normal}, '_'],
5000
).
finish_error(Workers) when is_list(Workers) ->
meck:reset(couch_views_server),
[exit(Pid, badness) || Pid <- Workers],
meck:wait(
length(Workers),
couch_views_server,
handle_info,
[{'_', '_', badness}, '_'],
5000
).
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