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#!/usr/bin/perl
package IkiWiki::Plugin::pinger;
use warnings;
use strict;
use IkiWiki 3.00;
my %pages;
my $pinged=0;
sub import {
hook(type => "getsetup", id => "pinger", call => \&getsetup);
hook(type => "needsbuild", id => "pinger", call => \&needsbuild);
hook(type => "preprocess", id => "ping", call => \&preprocess);
hook(type => "delete", id => "pinger", call => \&ping);
hook(type => "rendered", id => "pinger", call => \&ping);
}
sub getsetup () {
return
plugin => {
safe => 1,
rebuild => 0,
},
pinger_timeout => {
type => "integer",
example => 15,
description => "how many seconds to try pinging before timing out",
safe => 1,
rebuild => 0,
},
}
sub needsbuild (@) {
my $needsbuild=shift;
foreach my $page (keys %pagestate) {
if (exists $pagestate{$page}{pinger}) {
$pages{$page}=1;
if (exists $pagesources{$page} &&
grep { $_ eq $pagesources{$page} } @$needsbuild) {
# remove state, will be re-added if
# the ping directive is still present
# on rebuild.
delete $pagestate{$page}{pinger};
}
}
}
return $needsbuild;
}
sub preprocess (@) {
my %params=@_;
if (! exists $params{from} || ! exists $params{to}) {
error gettext("requires 'from' and 'to' parameters");
}
if ($params{from} eq $config{url}) {
$pagestate{$params{destpage}}{pinger}{$params{to}}=1;
$pages{$params{destpage}}=1;
return sprintf(gettext("Will ping %s"), $params{to});
}
else {
return sprintf(gettext("Ignoring ping directive for wiki %s (this wiki is %s)"), $params{from}, $config{url});
}
}
sub ping {
if (! $pinged && %pages) {
$pinged=1;
eval q{use Net::INET6Glue::INET_is_INET6}; # may not be available
my $ua;
eval q{use LWPx::ParanoidAgent};
if (!$@) {
$ua=LWPx::ParanoidAgent->new;
}
else {
eval q{use LWP};
if ($@) {
debug(gettext("LWP not found, not pinging"));
return;
}
$ua=LWP::UserAgent->new;
}
$ua->timeout($config{pinger_timeout} || 15);
# daemonise here so slow pings don't slow down wiki updates
defined(my $pid = fork) or error("Can't fork: $!");
return if $pid;
chdir '/';
open STDIN, '/dev/null';
open STDOUT, '>/dev/null';
POSIX::setsid() or error("Can't start a new session: $!");
open STDERR, '>&STDOUT' or error("Can't dup stdout: $!");
# Don't need to keep a lock on the wiki as a daemon.
IkiWiki::unlockwiki();
my %urls;
foreach my $page (%pages) {
if (exists $pagestate{$page}{pinger}) {
$urls{$_}=1 foreach keys %{$pagestate{$page}{pinger}};
}
}
foreach my $url (keys %urls) {
# Try to avoid pinging ourselves. If this check
# fails, it's not the end of the world, since we
# only ping when a page was changed, so a ping loop
# will still be avoided.
next if $url=~/^\Q$config{cgiurl}\E/;
my $local_cgiurl = IkiWiki::cgiurl();
next if $url=~/^\Q$local_cgiurl\E/;
$ua->get($url);
}
exit 0;
}
}
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