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#!/usr/bin/env python
#
# This file is part of Shinken.
#
# Shinken is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Shinken 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with Shinken. If not, see <http://www.gnu.org/licenses/>.
"""
This program transforms a flat dependency file into a json one so it
can be loaded in hot_dependencies_arbiter module
The input file format is:
host1 ":" vm1
host2 ":" vm2
...
Spaces around host- and vm-names will be stripped. Lines starting with
a `#` will be ignored.
You can now get a live update of your dependency tree in shinken for
your xen/virtualbox/qemu. All you have to do is finding a way to
modify this flat file when you do a live migration.
For example, you can use a script like this in your crontab::
dsh -Mc -g mydom0group 'xm list' | \
awk "/vm-/ { print \$1 }"' > /tmp/shinken_flat_mapping
"""
import os
import sys
import optparse
# Try to load json (2.5 and higer) or simplejson if failed (python2.4)
try:
import json
except ImportError:
# For old Python version, load simple json
try:
import simplejson as json
except ImportError:
raise SystemExit("Error: you need the json or simplejson module "
"for this script")
VERSION = '0.2'
def main(input_file, output_file, type):
# Check if input_file is newer than output_file
if os.path.exists(output_file):
if os.path.getmtime(output_file) >= os.path.getmtime(input_file):
print "Nothing to do"
return True
r = []
flatmappingfile = open(input_file)
try:
for line in flatmappingfile:
if line.startswith('#'):
# this is a comment line, skip it
continue
parts = line.split(':')
if type == 'service' :
v = (('service', parts[0].strip()), ('service', parts[1].strip()))
else:
v = (('host', parts[0].strip()), ('host', parts[1].strip()))
r.append(v)
finally:
flatmappingfile.close()
jsonmappingfile = open(output_file, 'w')
try:
json.dump(r, jsonmappingfile)
finally:
jsonmappingfile.close()
if __name__ == "__main__":
parser = optparse.OptionParser(
version="Shinken external flat mapping file to json mapping %s" % VERSION)
parser.add_option("-o", "--output", dest='output_file',
default='/tmp/external_mapping_file.json',
help="Path of the generated json mapping file.")
parser.add_option("-i", "--input", dest='input_file',
default='/tmp/shinken_flat_mapping',
help="Path of the flat mapping input file.")
parser.add_option("-t", "--type", dest='type',
default='host', help='it is a service or host dependency. ( host | service. Default : host)')
opts, args = parser.parse_args()
if args:
parser.error("does not take any positional arguments")
main(**vars(opts))
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