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##############################################################################
#
# Copyright (c) 2011 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.recipe.librecipe import GenericBaseRecipe
class Recipe(GenericBaseRecipe):
"""
haproxy instance configuration.
name -- local name of the haproxy
wrapper-path -- location of the init script to generate
binary-path -- location of the haproxy command
conf-path -- location of the configuration file
ip -- ip of the haproxy server
port -- port of the haproxy server
server-check-path -- path of the domain to check
address -- string with list of all url to check
Example: 127.0.0.1:12004 127.0.0.1:12005
"""
def install(self):
# inter must be quite short in order to detect quickly an unresponsive node
# and to detect quickly a node which is back
# rise must be minimal possible : 1, indeed, a node which is back don't need
# to sleep more time and we can give him work immediately
# fall should be quite sort. with inter at 3, and fall at 2, a node will be
# considered as dead after 6 seconds.
# maxconn should be set as the maximum thread we have per zope, like this
# haproxy will manage the queue of request with the possibility to
# move a request to another node if the initially selected one is dead
# maxqueue is the number of waiting request in the queue of every zope client.
# It allows to make sure that there is not a zope client handling all
# the work while other clients are doing nothing. This was happening
# even thoug we have round robin distribution because when a node dies
# some seconds, all request are dispatched to other nodes, and then users
# stick in other nodes and are not coming back. Please note this option
# is not an issue if you have more than (maxqueue * node_quantity) requests
# because haproxy will handle a top-level queue
snippet_filename = self.getTemplateFilename(
'haproxy-server-snippet.cfg.in')
# Prepare all filestorages
server_snippet = ""
i = 0
name = self.options['name']
for address in self.options['backend-list'].split():
i += 1
server_snippet += self.substituteTemplate(
snippet_filename, dict(
name='%s_%s' % (name, i),
address=address,
cluster_zope_thread_amount=self.options['maxconn']))
config = dict(
name=name,
ip=self.options['ip'],
port=self.options['port'],
server_text=server_snippet,
server_check_path=self.options['server-check-path'],)
template_filename = self.getTemplateFilename('haproxy.cfg.in')
configuration_path = self.createFile(
self.options['conf-path'],
self.substituteTemplate(template_filename, config))
# Create running wrapper
wrapper_path = self.createPythonScript(
self.options['wrapper-path'],
'slapos.recipe.librecipe.execute.execute',
arguments=[self.options['binary-path'].strip(), '-f', configuration_path],)
return [configuration_path, wrapper_path]