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| | #!/usr/bin/perl -w
# Copyright (C) 2016 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Parallel WWW checker
my $usage = "$0 [-j JOBS] [-s SLOW_THRESHOLD] URL_OF_INBOX\n";
use strict;
use warnings;
use File::Temp qw(tempfile);
use GDBM_File;
use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
use IO::Socket;
use LWP::ConnCache;
use POSIX qw(:sys_wait_h);
use Time::HiRes qw(gettimeofday tv_interval);
use WWW::Mechanize;
use Data::Dumper;
my $nproc = 4;
my $slow = 0.5;
my %opts = (
'-j|jobs=i' => \$nproc,
'-s|slow-threshold=f' => \$slow,
);
GetOptions(%opts) or die "bad command-line args\n$usage";
my $root_url = shift or die $usage;
my %workers;
$SIG{TERM} = sub { exit 0 };
$SIG{CHLD} = sub {
while (1) {
my $pid = waitpid(-1, WNOHANG);
return if !defined $pid || $pid <= 0;
my $p = delete $workers{$pid} || '(unknown)';
warn("$pid [$p] exited with $?\n") if $?;
}
};
my @todo = IO::Socket->socketpair(AF_UNIX, SOCK_SEQPACKET, 0);
die "socketpair failed: $!" unless $todo[1];
my @done = IO::Socket->socketpair(AF_UNIX, SOCK_SEQPACKET, 0);
die "socketpair failed: $!" unless $done[1];
$| = 1;
foreach my $p (1..$nproc) {
my $pid = fork;
die "fork failed: $!\n" unless defined $pid;
if ($pid) {
$workers{$pid} = $p;
} else {
$todo[1]->close;
$done[0]->close;
worker_loop($todo[0], $done[1]);
}
}
my ($fh, $tmp) = tempfile('www-check-XXXXXXXX',
SUFFIX => '.gdbm', UNLINK => 1, TMPDIR => 1);
my $gdbm = tie my %seen, 'GDBM_File', $tmp, &GDBM_WRCREAT, 0600;
defined $gdbm or die "gdbm open failed: $!\n";
$todo[0]->close;
$done[1]->close;
my ($rvec, $wvec);
$todo[1]->blocking(0);
$done[0]->blocking(0);
$seen{$root_url} = 1;
my $ndone = 0;
my $nsent = 1;
my @queue = ($root_url);
my $timeout = $slow * 4;
while (keys %workers) { # reacts to SIGCHLD
$wvec = $rvec = '';
my $u;
vec($rvec, fileno($done[0]), 1) = 1;
if (@queue) {
vec($wvec, fileno($todo[1]), 1) = 1;
} elsif ($ndone == $nsent) {
kill 'TERM', keys %workers;
exit;
}
if (!select($rvec, $wvec, undef, $timeout)) {
while (my ($k, $v) = each %seen) {
next if $v == 2;
print "WAIT ($ndone/$nsent) <$k>\n";
}
}
while ($u = shift @queue) {
my $s = $todo[1]->send($u, MSG_EOR);
if ($!{EAGAIN}) {
unshift @queue, $u;
last;
}
}
my $r;
do {
$r = $done[0]->recv($u, 65535, 0);
} while (!defined $r && $!{EINTR});
next unless $u;
if ($u =~ s/\ADONE\t//) {
$ndone++;
$seen{$u} = 2;
} else {
next if $seen{$u};
$seen{$u} = 1;
$nsent++;
push @queue, $u;
}
}
sub worker_loop {
my ($todo_rd, $done_wr) = @_;
my $m = WWW::Mechanize->new(autocheck => 0);
my $cc = LWP::ConnCache->new;
$m->conn_cache($cc);
while (1) {
$todo_rd->recv(my $u, 65535, 0);
next unless $u;
my $t = [ gettimeofday ];
my $r = $m->get($u);
$t = tv_interval($t);
printf "SLOW %0.06f % 5d %s\n", $t, $$, $u if $t > $slow;
my @links;
if ($r->is_success) {
my %links = map {
(split('#', $_->URI->abs->as_string))[0] => 1;
} grep {
$_->tag && $_->url !~ /:/
} $m->links;
@links = keys %links;
} elsif ($r->code != 300) {
warn "W: ".$r->code . " $u\n"
}
my $s;
# blocking
foreach my $l (@links, "DONE\t$u") {
next if $l eq '';
do {
$s = $done_wr->send($l, MSG_EOR);
} while (!defined $s && $!{EINTR});
die "$$ send $!\n" unless defined $s;
my $n = length($l);
die "$$ send truncated $s < $n\n" if $s != $n;
}
# make sure the HTML source doesn't screw up terminals
# when people curl the source (not remotely an expert
# on languages or encodings, here).
next if $r->header('Content-Type') !~ m!\btext/html\b!;
my $dc = $r->decoded_content;
if ($dc =~ /([\x00-\x08\x0d-\x1f\x7f-\x{99999999}]+)/s) {
my $o = $1;
my $c = Dumper($o);
warn "bad: $u $c\n";
}
}
}
|