#!/usr/bin/perl
# Support for external plugins written in other languages.
-# Communication via XML RPC a pipe.
+# Communication via XML RPC to a pipe.
# See externaldemo for an example of a plugin that uses this.
package IkiWiki::Plugin::external;
use warnings;
use strict;
-use IkiWiki 2.00;
+use IkiWiki 3.00;
use RPC::XML;
use RPC::XML::Parser;
use IPC::Open2;
my %plugins;
-sub import { #{{{
+sub import {
my $self=shift;
my $plugin=shift;
return unless defined $plugin;
$plugins{$plugin}={in => $plugin_read, out => $plugin_write, pid => $pid,
accum => ""};
+ $RPC::XML::ENCODING="utf-8";
rpc_call($plugins{$plugin}, "import");
-} #}}}
+}
-sub rpc_write ($$) { #{{{
+sub rpc_write ($$) {
my $fh=shift;
my $string=shift;
$fh->print($string."\n");
$fh->flush;
-} #}}}
+}
-sub rpc_call ($$;@) { #{{{
+sub rpc_call ($$;@) {
my $plugin=shift;
my $command=shift;
error("XML RPC parser failure: $r") unless ref $r;
if ($r->isa('RPC::XML::response')) {
my $value=$r->value;
- if ($value->isa('RPC::XML::array')) {
+ if ($r->is_fault($value)) {
+ # throw the error as best we can
+ print STDERR $value->string."\n";
+ return "";
+ }
+ elsif ($value->isa('RPC::XML::array')) {
return @{$value->value};
}
elsif ($value->isa('RPC::XML::struct')) {
- return %{$value->value};
- }
- elsif ($value->isa('RPC::XML::fault')) {
- die $value->string;
+ my %hash=%{$value->value};
+
+ # XML-RPC v1 does not allow for
+ # nil/null/None/undef values to be
+ # transmitted, so until
+ # XML::RPC::Parser honours v2
+ # (<nil/>), external plugins send
+ # a hash with one key "null" pointing
+ # to an empty string.
+ if (exists $hash{null} &&
+ $hash{null} eq "" &&
+ int(keys(%hash)) == 1) {
+ return undef;
+ }
+
+ return %hash;
}
else {
return $value->value;
error("XML RPC call error, unknown function: $name");
}
+ # XML-RPC v1 does not allow for nil/null/None/undef
+ # values to be transmitted, so until XML::RPC::Parser
+ # honours v2 (<nil/>), send a hash with one key "null"
+ # pointing to an empty string.
+ if (! defined $ret) {
+ $ret={"null" => ""};
+ }
+
my $string=eval { RPC::XML::response->new($ret)->as_string };
if ($@ && ref $ret) {
# One common reason for serialisation to
}
return undef;
-} #}}}
+}
package IkiWiki::RPC::XML;
use Memoize;
-sub getvar ($$$) { #{{{
+sub getvar ($$$) {
my $plugin=shift;
my $varname="IkiWiki::".shift;
my $key=shift;
my $ret=$varname->{$key};
use strict 'refs';
return $ret;
-} #}}}
+}
-sub setvar ($$$;@) { #{{{
+sub setvar ($$$;@) {
my $plugin=shift;
my $varname="IkiWiki::".shift;
my $key=shift;
+ my $value=shift;
no strict 'refs';
- my $ret=$varname->{$key}=@_;
+ my $ret=$varname->{$key}=$value;
use strict 'refs';
return $ret;
-} #}}}
+}
-sub getstate ($$$$) { #{{{
+sub getstate ($$$$) {
my $plugin=shift;
my $page=shift;
my $id=shift;
my $key=shift;
return $IkiWiki::pagestate{$page}{$id}{$key};
-} #}}}
+}
-sub setstate ($$$$;@) { #{{{
+sub setstate ($$$$;@) {
my $plugin=shift;
my $page=shift;
my $id=shift;
my $key=shift;
+ my $value=shift;
+
+ return $IkiWiki::pagestate{$page}{$id}{$key}=$value;
+}
+
+sub getargv ($) {
+ my $plugin=shift;
+
+ return \@ARGV;
+}
+
+sub setargv ($@) {
+ my $plugin=shift;
+ my $array=shift;
- return $IkiWiki::pagestate{$page}{$id}{$key}=@_;
-} #}}}
+ @ARGV=@$array;
+}
-sub inject ($@) { #{{{
+sub inject ($@) {
# Bind a given perl function name to a particular RPC request.
my $plugin=shift;
my %params=@_;
my $sub = sub {
IkiWiki::Plugin::external::rpc_call($plugin, $params{call}, @_)
};
+ $sub=memoize($sub) if $params{memoize};
+
+ # This will add it to the symbol table even if not present.
+ no warnings;
eval qq{*$params{name}=\$sub};
- memoize($params{name}) if $params{memoize};
+ use warnings;
+
+ # This will ensure that everywhere it was exported to sees
+ # the injected version.
+ IkiWiki::inject(name => $params{name}, call => $sub);
return 1;
-} #}}}
+}
-sub hook ($@) { #{{{
+sub hook ($@) {
# the call parameter is a function name to call, since XML RPC
# cannot pass a function reference
my $plugin=shift;
delete $params{call};
IkiWiki::hook(%params, call => sub {
- IkiWiki::Plugin::external::rpc_call($plugin, $callback, @_)
+ IkiWiki::Plugin::external::rpc_call($plugin, $callback, @_);
});
-} #}}}
+}
-sub pagespec_match ($@) { #{{{
+sub pagespec_match ($@) {
# convert pagespec_match's return object into a XML RPC boolean
my $plugin=shift;
return RPC::XML::boolean->new(0 + IkiWiki::pagespec_march(@_));
-} #}}}
+}
1