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import time
import lxml.etree
import operator
import re
import os
import Bcfg2.Server
try:
import json
has_json = True
except ImportError:
try:
import simplejson as json
has_json = True
except ImportError:
has_json = False
try:
import syck
has_syck = True
except ImportError:
has_syck = False
try:
import yaml
has_yaml = True
except ImportError:
has_yaml = False
import Bcfg2.Server.Plugin
specific_probe_matcher = re.compile("(.*/)?(?P<basename>\S+)(.(?P<mode>[GH](\d\d)?)_\S+)")
probe_matcher = re.compile("(.*/)?(?P<basename>\S+)")
class ClientProbeDataSet(dict):
""" dict of probe => [probe data] that records a for each host """
def __init__(self, *args, **kwargs):
if "timestamp" in kwargs and kwargs['timestamp'] is not None:
self.timestamp = kwargs.pop("timestamp")
else:
self.timestamp = time.time()
dict.__init__(self, *args, **kwargs)
class ProbeData(str):
""" a ProbeData object emulates a str object, but also has .xdata
and .json properties to provide convenient ways to use ProbeData
objects as XML or JSON data """
def __init__(self, data):
str.__init__(self, data)
self._xdata = None
self._json = None
self._yaml = None
@property
def data(self):
""" provide backwards compatibility with broken ProbeData
object in bcfg2 1.2.0 thru 1.2.2 """
return str(self)
@property
def xdata(self):
if self._xdata is None:
try:
self._xdata = lxml.etree.XML(self.data,
parser=Bcfg2.Server.XMLParser)
except lxml.etree.XMLSyntaxError:
pass
return self._xdata
@property
def json(self):
if self._json is None and has_json:
try:
self._json = json.loads(self.data)
except ValueError:
pass
return self._json
@property
def yaml(self):
if self._yaml is None:
if has_yaml:
try:
self._yaml = yaml.load(self.data)
except yaml.YAMLError:
pass
elif has_syck:
try:
self._yaml = syck.load(self.data)
except syck.error:
pass
return self._yaml
class ProbeSet(Bcfg2.Server.Plugin.EntrySet):
ignore = re.compile("^(\.#.*|.*~|\\..*\\.(tmp|sw[px])|probed\\.xml)$")
def __init__(self, path, fam, encoding, plugin_name):
fpattern = '[0-9A-Za-z_\-]+'
self.plugin_name = plugin_name
Bcfg2.Server.Plugin.EntrySet.__init__(self, fpattern, path,
Bcfg2.Server.Plugin.SpecificData,
encoding)
fam.AddMonitor(path, self)
self.bangline = re.compile('^#!(?P<interpreter>.*)$')
def HandleEvent(self, event):
if event.filename != self.path:
if (event.code2str == 'changed' and
event.filename.endswith("probed.xml") and
event.filename not in self.entries):
# for some reason, probed.xml is particularly prone to
# getting changed events before created events,
# because gamin is the worst ever. anyhow, we
# specifically handle it here to avoid a warning on
# every single server startup.
self.entry_init(event)
return
return self.handle_event(event)
def get_probe_data(self, metadata):
ret = []
build = dict()
candidates = self.get_matching(metadata)
candidates.sort(key=operator.attrgetter('specific'))
for entry in candidates:
rem = specific_probe_matcher.match(entry.name)
if not rem:
rem = probe_matcher.match(entry.name)
pname = rem.group('basename')
if pname not in build:
build[pname] = entry
for (name, entry) in list(build.items()):
probe = lxml.etree.Element('probe')
probe.set('name', name.split('/')[-1])
probe.set('source', self.plugin_name)
probe.text = entry.data
match = self.bangline.match(entry.data.split('\n')[0])
if match:
probe.set('interpreter', match.group('interpreter'))
else:
probe.set('interpreter', '/bin/sh')
ret.append(probe)
return ret
class Probes(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Probing,
Bcfg2.Server.Plugin.Connector):
"""A plugin to gather information from a client machine."""
name = 'Probes'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Connector.__init__(self)
Bcfg2.Server.Plugin.Probing.__init__(self)
try:
self.probes = ProbeSet(self.data, core.fam, core.encoding,
self.name)
except:
raise Bcfg2.Server.Plugin.PluginInitError
self.probedata = dict()
self.cgroups = dict()
self.load_data()
def write_data(self):
"""Write probe data out for use with bcfg2-info."""
top = lxml.etree.Element("Probed")
for client, probed in sorted(self.probedata.items()):
cx = lxml.etree.SubElement(top, 'Client', name=client,
timestamp=str(int(probed.timestamp)))
for probe in sorted(probed):
lxml.etree.SubElement(cx, 'Probe', name=probe,
value=str(self.probedata[client][probe]))
for group in sorted(self.cgroups[client]):
lxml.etree.SubElement(cx, "Group", name=group)
data = lxml.etree.tostring(top, encoding='UTF-8',
xml_declaration=True,
pretty_print='true')
try:
datafile = open("%s/%s" % (self.data, 'probed.xml'), 'w')
except IOError:
self.logger.error("Failed to write probed.xml")
datafile.write(data.decode('utf-8'))
def load_data(self):
try:
data = lxml.etree.parse(os.path.join(self.data, 'probed.xml'),
parser=Bcfg2.Server.XMLParser).getroot()
except:
self.logger.error("Failed to read file probed.xml")
return
self.probedata = {}
self.cgroups = {}
for client in data.getchildren():
self.probedata[client.get('name')] = \
ClientProbeDataSet(timestamp=client.get("timestamp"))
self.cgroups[client.get('name')] = []
for pdata in client:
if (pdata.tag == 'Probe'):
self.probedata[client.get('name')][pdata.get('name')] = \
ProbeData(pdata.get('value'))
elif (pdata.tag == 'Group'):
self.cgroups[client.get('name')].append(pdata.get('name'))
def GetProbes(self, meta, force=False):
"""Return a set of probes for execution on client."""
return self.probes.get_probe_data(meta)
def ReceiveData(self, client, datalist):
self.cgroups[client.hostname] = []
self.probedata[client.hostname] = ClientProbeDataSet()
for data in datalist:
self.ReceiveDataItem(client, data)
self.write_data()
def ReceiveDataItem(self, client, data):
"""Receive probe results pertaining to client."""
if client.hostname not in self.cgroups:
self.cgroups[client.hostname] = []
if data.text == None:
self.logger.error("Got null response to probe %s from %s" % \
(data.get('name'), client.hostname))
try:
self.probedata[client.hostname].update({data.get('name'):
ProbeData('')})
except KeyError:
self.probedata[client.hostname] = \
ClientProbeDataSet([(data.get('name'), ProbeData(''))])
return
dlines = data.text.split('\n')
self.logger.debug("%s:probe:%s:%s" % (client.hostname,
data.get('name'), [line.strip() for line in dlines]))
for line in dlines[:]:
if line.split(':')[0] == 'group':
newgroup = line.split(':')[1].strip()
if newgroup not in self.cgroups[client.hostname]:
self.cgroups[client.hostname].append(newgroup)
dlines.remove(line)
dobj = ProbeData("\n".join(dlines))
try:
self.probedata[client.hostname].update({data.get('name'): dobj})
except KeyError:
self.probedata[client.hostname] = \
ClientProbeDataSet([(data.get('name'), dobj)])
def get_additional_groups(self, meta):
return self.cgroups.get(meta.hostname, list())
def get_additional_data(self, meta):
return self.probedata.get(meta.hostname, ClientProbeDataSet())
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