* ubuntutools/lp/lpapiwrapper.py: Implement a singleton for LP API access (with lazy initialisation)

* ubuntutools/lp/functions.py: Use the new singleton

ubuntutools/lp/functions.py

@@ -21,14 +21,12 @@
 import urllib2
 import sys
 from udtexceptions import PackageNotFoundException, SeriesNotFoundException
-import libsupport as lp_libsupport
+from lpapiwrapper import Launchpad
 import launchpadlib
 from re import findall
 
-# Takes time to initialise - move to top level so we only pay the penalty
-# once. Should probably make this a proper class so we can instansiate
-# singleton-style (lazily).
-launchpad = lp_libsupport.get_launchpad("ubuntu-dev-tools")
+# Singleton to access LP API
+launchpad = Launchpad
 
 def getUbuntuDistribution():
     ubuntu = launchpad.distributions['ubuntu']

ubuntutools/lp/lpapiwrapper.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+#
+#   lpapiwrapper.py - wrapper class around the LP API for use in the
+#   ubuntu-dev-tools package
+#
+#   Copyright © 2009 Michael Bienia <geser@ubuntu.com>
+#
+#   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 3
+#   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.
+#
+#   Please see the /usr/share/common-licenses/GPL file for the full text
+#   of the GNU General Public License license.
+#
+#   Based on code written by Jonathan Davies <jpds@ubuntu.com>
+
+# Uncomment for tracing LP API calls
+#import httplib2
+#httplib2.debuglevel = 1
+
+import libsupport
+
+# Singleton for Launchpad API access
+class Launchpad(object):
+	__lp = None
+
+	def __getattr__(self, attr):
+		if not self.__lp:
+			self.__lp = libsupport.get_launchpad('ubuntu-dev-tools')
+		return getattr(self.__lp, attr)
+
+	def __call__(self):
+		return self
+Launchpad = Launchpad()