First release of standalone memcached recipe

slapos/recipe/README.memcached.txt

+memcached
+=========
+
+Instantiates Memcached instance.

slapos/recipe/memcached/__init__.py

+##############################################################################
+#
+# Copyright (c) 2010 Vifib SARL and Contributors. All Rights Reserved.
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# 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.
+#
+# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+from slapos.lib.recipe.BaseSlapRecipe import BaseSlapRecipe
+import os
+import pkg_resources
+import zc.buildout
+import zc.recipe.egg
+
+class Recipe(BaseSlapRecipe):
+  def getTemplateFilename(self, template_name):
+    return pkg_resources.resource_filename(__name__,
+        'template/%s' % template_name)
+
+  def _install(self):
+    self.path_list = []
+    self.requirements, self.ws = self.egg.working_set([__name__])
+    # XXX-Cedric : add logrotate?
+    memcached_conf = self.installMemcached(ip=self.getLocalIPv4Address(),
+        port=11000)
+    self.linkBinary()
+    self.setConnectionDict(dict(
+      url = memcached_conf['memcached_url'],
+    ))
+    return self.path_list
+
+  def linkBinary(self):
+    """Links binaries to instance's bin directory for easier exposal"""
+    for linkline in self.options.get('link_binary_list', '').splitlines():
+      if not linkline:
+        continue
+      target = linkline.split()
+      if len(target) == 1:
+        target = target[0]
+        path, linkname = os.path.split(target)
+      else:
+        linkname = target[1]
+        target = target[0]
+      link = os.path.join(self.bin_directory, linkname)
+      if os.path.lexists(link):
+        if not os.path.islink(link):
+          raise zc.buildout.UserError(
+              'Target link already %r exists but it is not link' % link)
+        os.unlink(link)
+      os.symlink(target, link)
+      self.logger.debug('Created link %r -> %r' % (link, target))
+      self.path_list.append(link)
+  
+  def installMemcached(self, ip, port):
+    config = dict(
+        memcached_binary=self.options['memcached_binary'],
+        memcached_ip=ip,
+        memcached_port=port,
+    )
+    self.path_list.append(self.createRunningWrapper('memcached',
+      self.substituteTemplate(self.getTemplateFilename('memcached.in'),
+        config)))
+    return dict(memcached_url='%s:%s' %
+        (config['memcached_ip'], config['memcached_port']),
+        memcached_ip=config['memcached_ip'],
+        memcached_port=config['memcached_port'])

slapos/recipe/memcached/template/memcached.in

+#!/bin/sh
+exec %(memcached_binary)s -p %(memcached_port)s -U %(memcached_port)s -l %(memcached_ip)s