[PATCH 3/3] add xt/mem-nntpd-tls maintainer test

[Eric Wong <e@80x24.org>]

This ensures memory usage is reasonable when DEFLATE and TLS are
enabled.  It's also our only coverage for NNTP COMPRESS since
Net::NNTP has yet to implement compression support:

https://rt.cpan.org/Public/Bug/Display.html?id=129967
---
 MANIFEST           |   1 +
 xt/mem-nntpd-tls.t | 254 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 255 insertions(+)
 create mode 100644 xt/mem-nntpd-tls.t

diff --git a/MANIFEST b/MANIFEST
index 10547351..ce5e08a7 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -595,6 +595,7 @@ xt/lei-auth-fail.t
 xt/lei-onion-convert.t
 xt/mem-imapd-tls.t
 xt/mem-msgview.t
+xt/mem-nntpd-tls.t
 xt/msgtime_cmp.t
 xt/net_nntp_socks.t
 xt/net_writer-imap.t
diff --git a/xt/mem-nntpd-tls.t b/xt/mem-nntpd-tls.t
new file mode 100644
index 00000000..6e34d233
--- /dev/null
+++ b/xt/mem-nntpd-tls.t
@@ -0,0 +1,254 @@
+#!perl -w
+# Copyright (C) all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+# Idle client memory usage test
+use v5.12.1;
+use PublicInbox::TestCommon;
+use File::Temp qw(tempdir);
+use Socket qw(SOCK_STREAM IPPROTO_TCP SOL_SOCKET);
+require_mods(qw(-nntpd));
+require PublicInbox::InboxWritable;
+require PublicInbox::SearchIdx;
+use PublicInbox::Syscall qw(:epoll);
+use PublicInbox::DS;
+my $version = 2; # v2 needs newer git
+require_git('2.6') if $version >= 2;
+use_ok 'IO::Socket::SSL';
+my ($cert, $key) = qw(certs/server-cert.pem certs/server-key.pem);
+unless (-r $key && -r $cert) {
+	plan skip_all =>
+		"certs/ missing for $0, run ./certs/create-certs.perl";
+}
+use_ok 'PublicInbox::TLS';
+my ($tmpdir, $for_destroy) = tmpdir();
+my $err = "$tmpdir/stderr.log";
+my $out = "$tmpdir/stdout.log";
+my $mainrepo = $tmpdir;
+my $pi_config = "$tmpdir/pi_config";
+my $group = 'test-nntpd-tls';
+my $addr = $group . '@example.com';
+local $SIG{PIPE} = 'IGNORE'; # for NNTPC (below)
+my $nntps = tcp_server();
+my $ibx = PublicInbox::Inbox->new({
+	inboxdir => $mainrepo,
+	name => 'nntpd-tls',
+	version => $version,
+	-primary_address => $addr,
+	indexlevel => 'basic',
+});
+$ibx = PublicInbox::InboxWritable->new($ibx, {nproc=>1});
+$ibx->init_inbox(0);
+{
+	open my $fh, '>', $pi_config or die "open: $!\n";
+	print $fh <<EOF
+[publicinbox "nntpd-tls"]
+	mainrepo = $mainrepo
+	address = $addr
+	indexlevel = basic
+	newsgroup = $group
+EOF
+	;
+	close $fh or die "close: $!\n";
+}
+
+{
+	my $im = $ibx->importer(0);
+	my $eml = eml_load('t/data/0001.patch');
+	ok($im->add($eml), 'message added');
+	$im->done;
+	if ($version == 1) {
+		my $s = PublicInbox::SearchIdx->new($ibx, 1);
+		$s->index_sync;
+	}
+}
+
+my $nntps_addr = tcp_host_port($nntps);
+my $env = { PI_CONFIG => $pi_config };
+my $tls = $ENV{TLS} // 1;
+my $args = $tls ? ["--cert=$cert", "--key=$key", "-lnntps://$nntps_addr"] : [];
+my $cmd = [ '-nntpd', '-W0', @$args, "--stdout=$out", "--stderr=$err" ];
+
+# run_mode=0 ensures Test::More FDs don't get shared
+my $td = start_script($cmd, $env, { 3 => $nntps, run_mode => 0 });
+my %ssl_opt = (
+	SSL_hostname => 'server.local',
+	SSL_verifycn_name => 'server.local',
+	SSL_verify_mode => SSL_VERIFY_PEER(),
+	SSL_ca_file => 'certs/test-ca.pem',
+);
+my $ctx = IO::Socket::SSL::SSL_Context->new(%ssl_opt);
+
+# cf. https://rt.cpan.org/Ticket/Display.html?id=129463
+my $mode = eval { Net::SSLeay::MODE_RELEASE_BUFFERS() };
+if ($mode && $ctx->{context}) {
+	eval { Net::SSLeay::CTX_set_mode($ctx->{context}, $mode) };
+	warn "W: $@ (setting SSL_MODE_RELEASE_BUFFERS)\n" if $@;
+}
+
+$ssl_opt{SSL_reuse_ctx} = $ctx;
+$ssl_opt{SSL_startHandshake} = 0;
+
+my %opt = (
+	Proto => 'tcp',
+	PeerAddr => $nntps_addr,
+	Type => SOCK_STREAM,
+	Blocking => 0
+);
+chomp(my $nfd = `/bin/sh -c 'ulimit -n'`);
+$nfd -= 10;
+ok($nfd > 0, 'positive FD count');
+my $MAX_FD = 10000;
+$nfd = $MAX_FD if $nfd >= $MAX_FD;
+our $DONE = 0;
+sub once { 0 }; # stops event loop
+
+# setup the event loop so that it exits at every step
+# while we're still doing connect(2)
+PublicInbox::DS->SetLoopTimeout(0);
+PublicInbox::DS->SetPostLoopCallback(\&once);
+
+foreach my $n (1..$nfd) {
+	my $io = tcp_connect($nntps, Blocking => 0);
+	$io = IO::Socket::SSL->start_SSL($io, %ssl_opt) if $tls;
+	NNTPC->new($io);
+
+	# one step through the event loop
+	# do a little work as we connect:
+	PublicInbox::DS::event_loop();
+
+	# try not to overflow the listen() backlog:
+	if (!($n % 128) && $n != $DONE) {
+		diag("nr: ($n) $DONE/$nfd");
+		PublicInbox::DS->SetLoopTimeout(-1);
+		PublicInbox::DS->SetPostLoopCallback(sub { $DONE != $n });
+
+		# clear the backlog:
+		PublicInbox::DS::event_loop();
+
+		# resume looping
+		PublicInbox::DS->SetLoopTimeout(0);
+		PublicInbox::DS->SetPostLoopCallback(\&once);
+	}
+}
+my $pid = $td->{pid};
+my $dump_rss = sub {
+	return if $^O ne 'linux';
+	open(my $f, '<', "/proc/$pid/status") or return;
+	diag(grep(/RssAnon/, <$f>));
+};
+$dump_rss->();
+
+# run the event loop normally, now:
+if ($DONE != $nfd) {
+	PublicInbox::DS->SetLoopTimeout(-1);
+	PublicInbox::DS->SetPostLoopCallback(sub {
+		diag "done: ".time." $DONE";
+		$DONE != $nfd;
+	});
+	PublicInbox::DS::event_loop();
+}
+
+is($nfd, $DONE, 'done');
+$dump_rss->();
+if ($^O eq 'linux') {
+	diag "  SELF lsof | wc -l ".`lsof -p $$ |wc -l`;
+	diag "SERVER lsof | wc -l ".`lsof -p $pid |wc -l`;
+}
+PublicInbox::DS->Reset;
+$td->kill;
+$td->join;
+is($?, 0, 'no error in exited process');
+done_testing();
+
+package NNTPC;
+use v5.12;
+use parent qw(PublicInbox::DS);
+use PublicInbox::Syscall qw(EPOLLIN EPOLLOUT EPOLLONESHOT);
+use Data::Dumper;
+
+# return true if complete, false if incomplete (or failure)
+sub connect_tls_step ($) {
+	my ($self) = @_;
+	my $sock = $self->{sock} or return;
+	return 1 if $sock->connect_SSL;
+	return $self->drop("$!") unless $!{EAGAIN};
+	if (my $ev = PublicInbox::TLS::epollbit()) {
+		unshift @{$self->{wbuf}}, \&connect_tls_step;
+		PublicInbox::DS::epwait($self->{sock}, $ev | EPOLLONESHOT);
+		0;
+	} else {
+		$self->drop('BUG? EAGAIN but '.PublicInbox::TLS::err());
+	}
+}
+
+sub event_step ($) {
+	my ($self) = @_;
+
+	# TLS negotiation happens in flush_write via {wbuf}
+	return unless $self->flush_write && $self->{sock};
+
+	if ($self->{step} == -2) {
+		$self->do_read(\(my $buf = ''), 128) or return;
+		$buf =~ /\A201 / or die "no greeting";
+		$self->{step} = -1;
+		$self->write(\"COMPRESS DEFLATE\r\n");
+	}
+	if ($self->{step} == -1) {
+		$self->do_read(\(my $buf = ''), 128) or return;
+		$buf =~ /\A20[0-9] / or die "no compression $buf";
+		NNTPCdeflate->enable($self);
+		$self->{step} = 1;
+		$self->write(\"DATE\r\n");
+	}
+	if ($self->{step} == 0) {
+		$self->do_read(\(my $buf = ''), 128) or return;
+		$buf =~ /\A201 / or die "no greeting";
+		$self->{step} = 1;
+		$self->write(\"DATE\r\n");
+	}
+	if ($self->{step} == 1) {
+		$self->do_read(\(my $buf = ''), 128) or return;
+		$buf =~ /\A111 / or die 'no date';
+		no warnings 'once';
+		$::DONE++;
+		$self->{step} = 2; # all done
+	} else {
+		die "$self->{step} Should never get here ". Dumper($self);
+	}
+}
+
+sub new {
+	my ($class, $io) = @_;
+	my $self = bless {}, $class;
+
+	# wait for connect(), and maybe SSL_connect()
+	$self->SUPER::new($io, EPOLLOUT|EPOLLONESHOT);
+	$self->{wbuf} = [ \&connect_tls_step ] if $io->can('connect_SSL');
+	$self->{step} = -2; # determines where we start event_step
+	$self;
+};
+
+1;
+package NNTPCdeflate;
+use v5.12;
+our @ISA = qw(NNTPC PublicInbox::DS);
+use Compress::Raw::Zlib;
+use PublicInbox::DSdeflate;
+BEGIN {
+	*write = \&PublicInbox::DSdeflate::write;
+	*do_read = \&PublicInbox::DSdeflate::do_read;
+	*event_step = \&NNTPC::event_step;
+	*flush_write = \&PublicInbox::DS::flush_write;
+	*close = \&PublicInbox::DS::close;
+}
+
+sub enable {
+	my ($class, $self) = @_;
+	my %ZIN_OPT = ( -WindowBits => -15, -AppendOutput => 1 );
+	my ($in, $err) = Compress::Raw::Zlib::Inflate->new(%ZIN_OPT);
+	die "Inflate->new failed: $err" if $err != Z_OK;
+	bless $self, $class;
+	$self->{zin} = $in;
+}
+
+1;