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#!/usr/bin/env escript
%% -*- erlang -*-
% 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.
main(_) ->
test_util:init_code_path(),
etap:plan(19),
case (catch test()) of
ok ->
etap:end_tests();
Other ->
etap:diag(io_lib:format("Test died abnormally: ~p", [Other])),
etap:bail(Other)
end,
ok.
test() ->
couch_server_sup:start_link(test_util:config_files()),
couch_config:set("query_server_config", "os_process_limit", "3", false),
test_pool_full(),
test_client_unexpected_exit(),
couch_server_sup:stop(),
ok.
test_pool_full() ->
Client1 = spawn_client(),
Client2 = spawn_client(),
Client3 = spawn_client(),
etap:diag("Check that we can spawn the max number of processes."),
etap:is(ping_client(Client1), ok, "Client 1 started ok."),
etap:is(ping_client(Client2), ok, "Client 2 started ok."),
etap:is(ping_client(Client3), ok, "Client 3 started ok."),
Proc1 = get_client_proc(Client1, "1"),
Proc2 = get_client_proc(Client2, "2"),
Proc3 = get_client_proc(Client3, "3"),
etap:isnt(Proc1, Proc2, "Clients 1 and 2 got different procs."),
etap:isnt(Proc2, Proc3, "Clients 2 and 3 got different procs."),
etap:diag("Check that client 4 blocks waiting for a process."),
Client4 = spawn_client(),
etap:is(ping_client(Client4), timeout, "Client 4 blocked while waiting."),
etap:diag("Check that stopping a client gives up its process."),
etap:is(stop_client(Client1), ok, "First client stopped."),
etap:diag("And check that our blocked process has been unblocked."),
etap:is(ping_client(Client4), ok, "Client was unblocked."),
Proc4 = get_client_proc(Client4, "4"),
etap:is(Proc4, Proc1, "Client 4 got proc that client 1 got before."),
lists:map(fun(C) -> ok = stop_client(C) end, [Client2, Client3, Client4]).
test_client_unexpected_exit() ->
Client1 = spawn_client(),
Client2 = spawn_client(),
Client3 = spawn_client(),
etap:diag("Check that up to os_process_limit clients started."),
etap:is(ping_client(Client1), ok, "Client 1 started ok."),
etap:is(ping_client(Client2), ok, "Client 2 started ok."),
etap:is(ping_client(Client3), ok, "Client 3 started ok."),
Proc1 = get_client_proc(Client1, "1"),
Proc2 = get_client_proc(Client2, "2"),
Proc3 = get_client_proc(Client3, "3"),
etap:isnt(Proc1, Proc2, "Clients 1 and 2 got different procs."),
etap:isnt(Proc2, Proc3, "Clients 2 and 3 got different procs."),
etap:diag("Check that killing a client frees an os_process."),
etap:is(kill_client(Client1), ok, "Client 1 died all right."),
etap:diag("Check that a new client is not blocked on boot."),
Client4 = spawn_client(),
etap:is(ping_client(Client4), ok, "New client booted without blocking."),
Proc4 = get_client_proc(Client4, "4"),
etap:isnt(Proc4, Proc1,
"Client 4 got a proc different from the one client 1 got before."),
etap:isnt(Proc4, Proc2, "Client 4's proc different from client 2's proc."),
etap:isnt(Proc4, Proc3, "Client 4's proc different from client 3's proc."),
lists:map(fun(C) -> ok = stop_client(C) end, [Client2, Client3, Client4]).
spawn_client() ->
Parent = self(),
Ref = make_ref(),
Pid = spawn(fun() ->
Proc = couch_query_servers:get_os_process(<<"javascript">>),
loop(Parent, Ref, Proc)
end),
{Pid, Ref}.
ping_client({Pid, Ref}) ->
Pid ! ping,
receive
{pong, Ref} -> ok
after 3000 -> timeout
end.
get_client_proc({Pid, Ref}, ClientName) ->
Pid ! get_proc,
receive
{proc, Ref, Proc} -> Proc
after 3000 ->
etap:bail("Timeout getting client " ++ ClientName ++ " proc.")
end.
stop_client({Pid, Ref}) ->
Pid ! stop,
receive
{stop, Ref} -> ok
after 3000 -> timeout
end.
kill_client({Pid, Ref}) ->
Pid ! die,
receive
{die, Ref} -> ok
after 3000 -> timeout
end.
loop(Parent, Ref, Proc) ->
receive
ping ->
Parent ! {pong, Ref},
loop(Parent, Ref, Proc);
get_proc ->
Parent ! {proc, Ref, Proc},
loop(Parent, Ref, Proc);
stop ->
couch_query_servers:ret_os_process(Proc),
Parent ! {stop, Ref};
die ->
Parent ! {die, Ref},
exit(some_error)
end.
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