[wellwell-devel] [wellwell] Add new module WellWell::Plugin for plugin handling.

[Stefan Hornburg]

commit 2b67a21f3fa831c7b13ad5f0e4b5949e27d27680
Author: Stefan Hornburg (Racke) <racke at linuxia.de>
Date:   Wed Oct 13 12:39:52 2010 +0200

    Add new module WellWell::Plugin for plugin handling.
    Currently supports plugin scan and activation.

 catalog.cfg            |    5 ++-
 lib/WellWell/Core.pm   |   24 ++++++++++
 lib/WellWell/Data.pm   |   12 +++++
 lib/WellWell/Plugin.pm |  112 ++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 152 insertions(+), 1 deletions(-)
---
diff --git a/catalog.cfg b/catalog.cfg
index c73693f..5f99a97 100644
--- a/catalog.cfg
+++ b/catalog.cfg
@@ -27,7 +27,10 @@ ImageDir __IMAGE_URL__/
 include code/*.*
 
 # Functions to run after completion of the configuration
-StartupHooks prepare_database
+StartupHooks <<EOH
+	prepare_database
+	plugin_scan
+EOH
 
 # Profiles
 OrderProfile profiles/*.profile
diff --git a/lib/WellWell/Core.pm b/lib/WellWell/Core.pm
index d6793bc..c718ce7 100644
--- a/lib/WellWell/Core.pm
+++ b/lib/WellWell/Core.pm
@@ -26,6 +26,7 @@ use Vend::Config;
 
 use WellWell::Cart;
 use WellWell::Data;
+use WellWell::Plugin qw/plugin_scan plugin_enable/;
 
 # setup configuration directives
 Vend::Config::parse_directive('Hook', 'Hook hook');
@@ -33,6 +34,7 @@ Vend::Config::parse_directive('StartupHooks', 'StartupHooks startup_hooks');
 
 # predefined startup hooks
 Vend::Config::parse_subroutine('GlobalSub', 'prepare_database WellWell::Data::prepare_database');
+Vend::Config::parse_subroutine('GlobalSub', 'plugin_scan WellWell::Core::plugin_scan_sub');
 
 # all what we want is to transfer CGI values from CGI to the Values
 # space, and nothing else
@@ -47,6 +49,28 @@ sub plugins {
 	return @plugins;
 }
 
+# called at startup to scan plugins
+sub plugin_scan_sub {
+	my ($dbif, $plref);
+
+	$dbif = WellWell::Data::easy_handle();
+	$plref = WellWell::Plugin::plugin_scan($dbif, "$Vend::Cfg->{VendRoot}/plugins",
+										   "$Vend::Cfg->{VendRoot}/local/plugins");
+
+	for my $plugin (plugins()) {
+		if (exists $plref->{$plugin}) {
+			if ($plref->{$plugin}->{status} eq 0) {
+				Vend::Config::config_error("Plugin $plugin used in PLUGIN variable is explicitly disabled in plugins table.");
+				return;
+			}
+			elsif (! defined($plref->{$plugin}->{status})) {
+				Vend::Config::config_warn("Enabling plugin $plugin in plugins table.");
+				plugin_enable($dbif, $plugin);
+			}
+		}
+	}
+}
+
 sub hooks {
 	my ($function, $name, @args) = @_;
 
diff --git a/lib/WellWell/Data.pm b/lib/WellWell/Data.pm
index b8d8ed4..7048981 100644
--- a/lib/WellWell/Data.pm
+++ b/lib/WellWell/Data.pm
@@ -23,6 +23,7 @@ use strict;
 use warnings;
 
 use Vend::Data;
+use DBIx::Easy;
 
 sub prepare_database {
 	my ($userdb_ref, $users_table, %dbif);
@@ -71,4 +72,15 @@ sub prepare_database {
 	return;
 }
 
+sub easy_handle {
+	my ($dbh, $dbif);
+
+	$dbh = database_exists_ref('products')->dbh();
+		
+	$dbif = new DBIx::Easy ($dbh->{Driver}->{Name}, $dbh->{Name});
+	$dbif->{CONN} = $dbh->clone;
+
+	return $dbif;
+}
+
 1;
diff --git a/lib/WellWell/Plugin.pm b/lib/WellWell/Plugin.pm
new file mode 100644
index 0000000..80cdcb5
--- /dev/null
+++ b/lib/WellWell/Plugin.pm
@@ -0,0 +1,112 @@
+# WellWell::Plugin - WellWell plugin routines
+#
+# Copyright (C) 2010 Stefan Hornburg (Racke) <racke at linuxia.de>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public
+# License along with this program; if not, write to the Free
+# Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+package WellWell::Plugin;
+
+use vars qw/@ISA @EXPORT_OK/;
+
+require Exporter;
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw/plugin_scan plugin_enable/;
+	
+sub plugin_scan {
+	my ($dbif, @dirs) = @_;
+	my (@plugins, $dirname, $infofile, $plugininfo, $dbref);
+	my ($plugin, $pluginrec);
+	my ($sth, $href);
+	my (%plugins);
+	
+	# read current plugins from database
+	$sth = $dbif->process('select * from plugins');
+
+	while ($href = $sth->fetchrow_hashref()) {
+		$plugins{$href->{name}} = $href;
+	}
+	
+	for my $dir (@dirs) {
+		opendir(PLUGINS, $dir);
+		while ($dirname = readdir(PLUGINS)) {
+			next unless -d "plugins/$dirname";
+			next if $dirname =~ /^\./;
+
+			# info file ?
+			$infofile = "plugins/$dirname/$dirname.info";
+			if (-f $infofile) {
+				$plugininfo = plugin_get_info($infofile);
+
+				if (exists $plugins{$dirname}) {
+					# existing plugin
+				}
+				else {
+					# new plugin
+					$pluginrec = {name => $dirname,
+								  version => $plugininfo->{version},
+								  label => $plugininfo->{label} || $dirname,
+								  active => undef};
+
+					$dbif->insert('plugins', %$pluginrec);
+					
+					$plugins{$dirname} = $pluginrec;
+				}
+			}
+
+			if ($plugininfo->{require}) {
+				my @modules;
+
+				@modules = split(/\s*,\s*/, $plugininfo->{require});
+
+				for (@modules) {
+#					warn("Require $_.\n");
+				}
+			}
+		}
+		closedir(PLUGINS);
+	}
+
+	return \%plugins;
+}
+
+sub plugin_enable {
+	my ($dbif, $plugin) = @_;
+
+	$dbif->update('plugins', 'name = ' . $dbif->quote($plugin), active => 1);
+}
+
+sub plugin_get_info {
+	my ($infofile) = @_;
+	my %info;
+	
+	open(INFOFILE, $infofile)
+		|| die "Failed to open plugin info file $infofile\n";
+	while (<INFOFILE>) {
+		chomp;
+		# skip emptylines and comments
+		next if ! /\S/;
+		next if /^\s*#/;
+		next unless /=/;
+
+		my ($key, $value) = split(/\s*=\s*/, $_, 2);
+		$info{$key} = $value;
+	}
+	close(INFOFILE);
+
+	return \%info;
+}
+
+1;