pinger/pingee now tested and working

1 files changed, 100 insertions, 0 deletions

diff --git a/IkiWiki/Plugin/pinger.pm b/IkiWiki/Plugin/pinger.pm
new file mode 100644
index 000000000..c6fa76e3f
--- /dev/null
+++ b/IkiWiki/Plugin/pinger.pm
@@ -0,0 +1,100 @@
+#!/usr/bin/perl
+package IkiWiki::Plugin::pinger;
+
+use warnings;
+use strict;
+use IkiWiki 2.00;
+
+my %pages;
+my $pinged=0;
+
+sub import { #{{{
+	hook(type => "needsbuild", id => "pinger", call => \&needsbuild);
+	hook(type => "preprocess", id => "ping", call => \&preprocess);
+	hook(type => "delete", id => "pinger", call => \&ping);
+	hook(type => "change", id => "pinger", call => \&ping);
+} # }}}
+
+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};
+			}
+		}
+	}
+} # }}}
+
+sub preprocess (@) { #{{{
+	my %params=@_;
+	if (! exists $params{from} || ! exists $params{to}) {
+		return "[[ping ".gettext("requires 'from' and 'to' parameters")."]]";
+	}
+	if ($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;
+		
+		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/;
+			
+			$ua->head($url);
+		}
+		
+		exit 0;
+	}
+}
+
+1