Mercurial > hg > nginx-tests
view stream_udp_proxy.t @ 1752:ba6e24e38f03
Tests: improved stop_daemons() to send signal again.
As was observed, it's possible that a signal to complete a uwsgi daemon
can be ignored while it is starting up, which results in tests hang due
to eternal waiting on child processes termination. Notably, it is seen
when running tests with a high number of prove jobs on a low-profile VM
against nginx with broken modules and/or configuration. To reproduce:
$ TEST_NGINX_GLOBALS=ERROR prove -j16 uwsgi*.t
Inspecting uwsgi under ktrace on FreeBSD confirms that a SIGTERM signal
is ignored at the very beginning of uwsgi startup. It is then replaced
with a default action after listen(), thus waiting until uwsgi is ready
to accept new TCP connections doesn't completely solve the hang window.
The fix is to retry sending a signal some time after waitpid(WNOHANG)
continuously demonstrated no progress with reaping a signaled process.
It is modelled after f13ead27f89c that improved stop() for nginx.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Wed, 29 Dec 2021 22:29:23 +0300 |
parents | 5ac6efbe5552 |
children |
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#!/usr/bin/perl # (C) Nginx, Inc. # Tests for stream proxy module with datagrams. ############################################################################### use warnings; use strict; use Test::More; BEGIN { use FindBin; chdir($FindBin::Bin); } use lib 'lib'; use Test::Nginx; use Test::Nginx::Stream qw/ dgram /; ############################################################################### select STDERR; $| = 1; select STDOUT; $| = 1; my $t = Test::Nginx->new()->has(qw/stream udp/)->plan(8) ->write_file_expand('nginx.conf', <<'EOF'); %%TEST_GLOBALS%% daemon off; events { } stream { %%TEST_GLOBALS_STREAM%% proxy_timeout 1s; server { listen 127.0.0.1:%%PORT_8980_UDP%% udp; proxy_pass 127.0.0.1:%%PORT_8981_UDP%%; proxy_responses 0; } server { listen 127.0.0.1:%%PORT_8982_UDP%% udp; proxy_pass 127.0.0.1:%%PORT_8981_UDP%%; proxy_responses 2; } server { listen 127.0.0.1:%%PORT_8983_UDP%% udp; proxy_pass 127.0.0.1:%%PORT_8981_UDP%%; } } EOF $t->run_daemon(\&udp_daemon, port(8981), $t); $t->run(); $t->waitforfile($t->testdir . '/' . port(8981)); ############################################################################### my $s = dgram('127.0.0.1:' . port(8980)); is($s->io('1', read => 1, read_timeout => 0.5), '', 'proxy responses 0'); $s = dgram('127.0.0.1:' . port(8982)); is($s->io('1'), '1', 'proxy responses 1'); $s = dgram('127.0.0.1:' . port(8982)); is($s->io('2', read => 2), '12', 'proxy responses 2'); $s = dgram('127.0.0.1:' . port(8983)); is($s->io('3', read => 3), '123', 'proxy responses default'); # zero-length payload $s = dgram('127.0.0.1:' . port(8982)); $s->write(''); is($s->read(), 'zero', 'upstream read zero bytes'); is($s->read(), '', 'upstream sent zero bytes'); $s->write(''); is($s->read(), 'zero', 'upstream read zero bytes again'); is($s->read(), '', 'upstream sent zero bytes again'); ############################################################################### sub udp_daemon { my ($port, $t) = @_; my $server = IO::Socket::INET->new( Proto => 'udp', LocalAddr => '127.0.0.1:' . port(8981), Reuse => 1, ) or die "Can't create listening socket: $!\n"; # signal we are ready open my $fh, '>', $t->testdir() . '/' . port(8981); close $fh; while (1) { $server->recv(my $buffer, 65536); if (length($buffer) > 0) { $server->send($_) for (1 .. $buffer); } else { $server->send('zero'); select undef, undef, undef, 0.2; $server->send(''); } } } ###############################################################################