Mercurial > hg > nginx-tests
view upstream_least_conn.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 | 882267679006 |
children |
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#!/usr/bin/perl # (C) Maxim Dounin # Tests for upstream least_conn balancer module. ############################################################################### use warnings; use strict; use Test::More; BEGIN { use FindBin; chdir($FindBin::Bin); } use lib 'lib'; use Test::Nginx qw/ :DEFAULT http_end /; ############################################################################### select STDERR; $| = 1; select STDOUT; $| = 1; my $t = Test::Nginx->new()->has(qw/http proxy upstream_least_conn/)->plan(2); $t->write_file_expand('nginx.conf', <<'EOF'); %%TEST_GLOBALS%% daemon off; events { } http { %%TEST_GLOBALS_HTTP%% upstream u { least_conn; server 127.0.0.1:8081; server 127.0.0.1:8082; } server { listen 127.0.0.1:8080; server_name localhost; location / { proxy_pass http://u; } } } EOF $t->run_daemon(\&http_daemon, port(8081)); $t->run_daemon(\&http_daemon, port(8082)); $t->run(); $t->waitforsocket('127.0.0.1:' . port(8081)); $t->waitforsocket('127.0.0.1:' . port(8082)); ############################################################################### my @ports = my ($port1, $port2) = (port(8081), port(8082)); is(many('/', 10), "$port1: 5, $port2: 5", 'balanced'); my @sockets; push(@sockets, http_get('/w', start => 1)); push(@sockets, http_get('/w', start => 1)); select undef, undef, undef, 0.2; is(many('/w', 10), "$port2: 10", 'least conn'); ############################################################################### sub many { my ($uri, $count) = @_; my %ports; for (1 .. $count) { if (http_get($uri) =~ /X-Port: (\d+)/) { $ports{$1} = 0 unless defined $ports{$1}; $ports{$1}++; } } my @keys = map { my $p = $_; grep { $p == $_ } keys %ports } @ports; return join ', ', map { $_ . ": " . $ports{$_} } @keys; } ############################################################################### sub http_daemon { my ($port) = @_; my $server = IO::Socket::INET->new( Proto => 'tcp', LocalHost => '127.0.0.1', LocalPort => $port, Listen => 5, Reuse => 1 ) or die "Can't create listening socket: $!\n"; local $SIG{PIPE} = 'IGNORE'; while (my $client = $server->accept()) { $client->autoflush(1); my $headers = ''; my $uri = ''; while (<$client>) { $headers .= $_; last if (/^\x0d?\x0a?$/); } $uri = $1 if $headers =~ /^\S+\s+([^ ]+)\s+HTTP/i; if ($uri eq '/w' && $port == port(8081)) { Test::Nginx::log_core('||', "$port: sleep(2.5)"); select undef, undef, undef, 2.5; } Test::Nginx::log_core('||', "$port: response, 200"); print $client <<EOF; HTTP/1.1 200 OK Connection: close X-Port: $port OK EOF close $client; } } ###############################################################################