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'''This module implements a Nagios configuration generator'''
import os
import re
import sys
import glob
import socket
import logging
import lxml.etree
import Bcfg2.Server
import Bcfg2.Server.Plugin
LOGGER = logging.getLogger('Bcfg2.Plugins.NagiosGen')
line_fmt = '\t%-32s %s'
class NagiosGenConfig(Bcfg2.Server.Plugin.SingleXMLFileBacked,
Bcfg2.Server.Plugin.StructFile):
def __init__(self, filename, fam):
# create config.xml if missing
if not os.path.exists(filename):
LOGGER.warning("NagiosGen: %s missing. "
"Creating empty one for you." % filename)
f = open(filename, "w")
f.write("<NagiosGen></NagiosGen>")
f.close()
try:
Bcfg2.Server.Plugin.SingleXMLFileBacked.__init__(self,
filename,
fam)
except OSError:
LOGGER.error("NagiosGen: Failed to read configuration file: %s" % err)
raise Bcfg2.Server.Plugin.PluginInitError(msg)
Bcfg2.Server.Plugin.StructFile.__init__(self, filename)
class NagiosGen(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Generator):
"""NagiosGen is a Bcfg2 plugin that dynamically generates
Nagios configuration file based on Bcfg2 data.
"""
name = 'NagiosGen'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Generator.__init__(self)
self.config = NagiosGenConfig(os.path.join(self.data, 'config.xml'),
core.fam)
self.Entries = {'Path':
{'/etc/nagiosgen.status': self.createhostconfig,
'/etc/nagios/nagiosgen.cfg': self.createserverconfig}}
self.client_attrib = {'encoding': 'ascii',
'owner': 'root',
'group': 'root',
'type': 'file',
'perms': '0400'}
self.server_attrib = {'encoding': 'ascii',
'owner': 'nagios',
'group': 'nagios',
'type': 'file',
'perms': '0440'}
def createhostconfig(self, entry, metadata):
"""Build host specific configuration file."""
host_address = socket.gethostbyname(metadata.hostname)
host_groups = [grp for grp in metadata.groups
if os.path.isfile('%s/%s-group.cfg' % (self.data, grp))]
host_config = ['define host {',
line_fmt % ('host_name', metadata.hostname),
line_fmt % ('alias', metadata.hostname),
line_fmt % ('address', host_address)]
if host_groups:
host_config.append(line_fmt % ("hostgroups",
",".join(host_groups)))
# read the old-style Properties config, but emit a warning.
xtra = dict()
props = None
if (hasattr(metadata, 'Properties') and
'NagiosGen.xml' in metadata.Properties):
props = metadata.Properties['NagiosGen.xml'].data
if props is not None:
LOGGER.warn("Parsing deprecated Properties/NagiosGen.xml. "
"Update to the new-style config with "
"nagiosgen-convert.py.")
xtra = dict((el.tag, el.text)
for el in props.find(metadata.hostname))
# hold off on parsing the defaults until we've checked for
# a new-style config
# read the old-style parents.xml, but emit a warning
pfile = os.path.join(self.data, "parents.xml")
if os.path.exists(pfile):
LOGGER.warn("Parsing deprecated NagiosGen/parents.xml. "
"Update to the new-style config with "
"nagiosgen-convert.py.")
parents = lxml.etree.parse(pfile,
parser=Bcfg2.Server.XMLParser)
for el in parents.xpath("//Depend[@name='%s']" % metadata.hostname):
if 'parent' in xtra:
xtra['parent'] += "," + el.get("on")
else:
xtra['parent'] = el.get("on")
# read the new-style config and overwrite the old-style config
for el in self.config.Match(metadata):
if el.tag == 'Option':
xtra[el.get("name")] = el.text
# if we haven't found anything in the new- or old-style
# configs, finally read defaults from old-style config
if not xtra and props is not None:
xtra = dict((el.tag, el.text) for el in props.find('default'))
if xtra:
host_config.extend([line_fmt % (opt, val)
for opt, val in list(xtra.items())])
else:
host_config.append(line_fmt % ('use', 'default'))
host_config.append('}')
entry.text = "%s\n" % "\n".join(host_config)
[entry.attrib.__setitem__(key, value)
for (key, value) in list(self.client_attrib.items())]
try:
fileh = open("%s/%s-host.cfg" %
(self.data, metadata.hostname), 'w')
fileh.write(entry.text)
fileh.close()
except OSError:
ioerr = sys.exc_info()[1]
LOGGER.error("Failed to write %s/%s-host.cfg" %
(self.data, metadata.hostname))
LOGGER.error(ioerr)
def createserverconfig(self, entry, _):
"""Build monolithic server configuration file."""
host_configs = glob.glob('%s/*-host.cfg' % self.data)
group_configs = glob.glob('%s/*-group.cfg' % self.data)
host_data = []
group_data = []
for host in host_configs:
host_data.append(open(host, 'r').read())
for group in group_configs:
group_name = re.sub("(-group.cfg|.*/(?=[^/]+))", "", group)
if "\n".join(host_data).find(group_name) != -1:
groupfile = open(group, 'r')
group_data.append(groupfile.read())
groupfile.close()
entry.text = "%s\n\n%s" % ("\n".join(group_data), "\n".join(host_data))
[entry.attrib.__setitem__(key, value)
for (key, value) in list(self.server_attrib.items())]
try:
fileh = open("%s/nagiosgen.cfg" % self.data, 'w')
fileh.write(entry.text)
fileh.close()
except OSError:
ioerr = sys.exc_info()[1]
LOGGER.error("Failed to write %s/nagiosgen.cfg" % self.data)
LOGGER.error(ioerr)
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