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""" A plugin to gather information from a client machine """
import re
import os
import sys
import time
import copy
import operator
import lxml.etree
import Bcfg2.Server
import Bcfg2.Server.Plugin
from Bcfg2.Compat import unicode # pylint: disable=W0622
try:
from django.db import models
from django.core.exceptions import MultipleObjectsReturned
HAS_DJANGO = True
class ProbesDataModel(models.Model,
Bcfg2.Server.Plugin.PluginDatabaseModel):
""" The database model for storing probe data """
hostname = models.CharField(max_length=255)
probe = models.CharField(max_length=255)
timestamp = models.DateTimeField(auto_now=True)
data = models.TextField(null=True)
class ProbesGroupsModel(models.Model,
Bcfg2.Server.Plugin.PluginDatabaseModel):
""" The database model for storing probe groups """
hostname = models.CharField(max_length=255)
group = models.CharField(max_length=255)
except ImportError:
HAS_DJANGO = False
try:
import json
HAS_JSON = True
except ImportError:
try:
import simplejson as json
HAS_JSON = True
except ImportError:
HAS_JSON = False
try:
import yaml
HAS_YAML = True
except ImportError:
HAS_YAML = False
class ClientProbeDataSet(dict):
""" dict of probe => [probe data] that records a timestamp 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): # pylint: disable=E0012,R0924
""" a ProbeData object emulates a str object, but also has .xdata,
.json, and .yaml properties to provide convenient ways to use
ProbeData objects as XML, JSON, or YAML data """
def __new__(cls, data):
if isinstance(data, unicode):
return str.__new__(cls, data.encode('utf-8'))
else:
return str.__new__(cls, data)
def __init__(self, data): # pylint: disable=W0613
str.__init__(self)
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):
""" The probe data as a lxml.etree._Element document """
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):
""" The probe data as a decoded JSON data structure """
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):
""" The probe data as a decoded YAML data structure """
if self._yaml is None and HAS_YAML:
try:
self._yaml = yaml.load(self.data)
except yaml.YAMLError:
pass
return self._yaml
class ProbeSet(Bcfg2.Server.Plugin.EntrySet):
""" Handle universal and group- and host-specific probe files """
ignore = re.compile(r'^(\.#.*|.*~|\..*\.(tmp|sw[px])|probed\.xml)$')
probename = \
re.compile(r'(.*/)?(?P<basename>\S+?)(\.(?P<mode>(?:G\d\d)|H)_\S+)?$')
bangline = re.compile(r'^#!\s*(?P<interpreter>.*)$')
basename_is_regex = True
def __init__(self, path, fam, encoding, plugin_name):
self.plugin_name = plugin_name
Bcfg2.Server.Plugin.EntrySet.__init__(self, r'[0-9A-Za-z_\-]+', path,
Bcfg2.Server.Plugin.SpecificData,
encoding)
fam.AddMonitor(path, self)
def HandleEvent(self, event):
""" handle events on everything but probed.xml """
if (event.filename != self.path and
not event.filename.endswith("probed.xml")):
return self.handle_event(event)
def get_probe_data(self, metadata):
""" Get an XML description of all probes for a client suitable
for sending to that client.
:param metadata: The client metadata to get probes for.
:type metadata: Bcfg2.Server.Plugins.Metadata.ClientMetadata
:returns: list of lxml.etree._Element objects, each of which
represents one probe.
"""
ret = []
build = dict()
candidates = self.get_matching(metadata)
candidates.sort(key=operator.attrgetter('specific'))
for entry in candidates:
rem = self.probename.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', os.path.basename(name))
probe.set('source', self.plugin_name)
if (metadata.version_info and
metadata.version_info > (1, 3, 1, '', 0)):
try:
probe.text = entry.data.decode('utf-8')
except AttributeError:
probe.text = entry.data
else:
try:
probe.text = entry.data
except: # pylint: disable=W0702
self.logger.error("Client unable to handle unicode "
"probes. Skipping %s" %
probe.get('name'))
continue
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
def __str__(self):
return "ProbeSet for %s" % self.plugin_name
class Probes(Bcfg2.Server.Plugin.Probing,
Bcfg2.Server.Plugin.Caching,
Bcfg2.Server.Plugin.Connector,
Bcfg2.Server.Plugin.DatabaseBacked):
""" A plugin to gather information from a client machine """
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Probing.__init__(self)
Bcfg2.Server.Plugin.Caching.__init__(self)
Bcfg2.Server.Plugin.Connector.__init__(self)
Bcfg2.Server.Plugin.DatabaseBacked.__init__(self, core, datastore)
try:
self.probes = ProbeSet(self.data, core.fam, core.setup['encoding'],
self.name)
except:
err = sys.exc_info()[1]
raise Bcfg2.Server.Plugin.PluginInitError(err)
self.allowed_cgroups = core.setup['probe_allowed_groups']
self.probedata = dict()
self.cgroups = dict()
self.load_data()
__init__.__doc__ = Bcfg2.Server.Plugin.DatabaseBacked.__init__.__doc__
@Bcfg2.Server.Plugin.track_statistics()
def write_data(self, client):
""" Write probe data out for use with bcfg2-info """
if self._use_db:
return self._write_data_db(client)
else:
return self._write_data_xml(client)
def _write_data_xml(self, _):
""" Write received probe data to probed.xml """
top = lxml.etree.Element("Probed")
for client, probed in sorted(self.probedata.items()):
# make a copy of probe data for this client in case it
# submits probe data while we're trying to write
# probed.xml
probedata = copy.copy(probed)
ctag = \
lxml.etree.SubElement(top, 'Client', name=client,
timestamp=str(int(probedata.timestamp)))
for probe in sorted(probedata):
try:
lxml.etree.SubElement(
ctag, 'Probe', name=probe,
value=str(
self.probedata[client][probe]).decode('utf-8'))
except AttributeError:
lxml.etree.SubElement(
ctag, 'Probe', name=probe,
value=str(self.probedata[client][probe]))
for group in sorted(self.cgroups[client]):
lxml.etree.SubElement(ctag, "Group", name=group)
try:
top.getroottree().write(os.path.join(self.data, 'probed.xml'),
xml_declaration=False,
pretty_print='true')
except IOError:
err = sys.exc_info()[1]
self.logger.error("Failed to write probed.xml: %s" % err)
@Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
def _write_data_db(self, client):
""" Write received probe data to the database """
for probe, data in self.probedata[client.hostname].items():
try:
pdata = ProbesDataModel.objects.get_or_create(
hostname=client.hostname,
probe=probe)[0]
except MultipleObjectsReturned:
ProbesDataModel.objects.filter(hostname=client.hostname,
probe=probe).delete()
ProbesDataModel.objects.get_or_create(
hostname=client.hostname,
probe=probe)
if pdata.data != data:
pdata.data = data
pdata.save()
ProbesDataModel.objects.filter(
hostname=client.hostname).exclude(
probe__in=self.probedata[client.hostname]).delete()
for group in self.cgroups[client.hostname]:
try:
ProbesGroupsModel.objects.get_or_create(
hostname=client.hostname,
group=group)
except MultipleObjectsReturned:
ProbesGroupsModel.objects.filter(hostname=client.hostname,
group=group).delete()
ProbesGroupsModel.objects.get_or_create(
hostname=client.hostname,
group=group)
ProbesGroupsModel.objects.filter(
hostname=client.hostname).exclude(
group__in=self.cgroups[client.hostname]).delete()
def expire_cache(self, key=None):
self.load_data(client=key)
def load_data(self, client=None):
""" Load probe data from the appropriate backend (probed.xml
or the database) """
if self._use_db:
return self._load_data_db(client=client)
else:
# the XML backend doesn't support loading data for single
# clients, so it reloads all data
return self._load_data_xml()
def _load_data_xml(self):
""" Load probe data from probed.xml """
try:
data = lxml.etree.parse(os.path.join(self.data, 'probed.xml'),
parser=Bcfg2.Server.XMLParser).getroot()
except (IOError, lxml.etree.XMLSyntaxError):
err = sys.exc_info()[1]
self.logger.error("Failed to read file probed.xml: %s" % err)
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'))
if self.core.metadata_cache_mode in ['cautious', 'aggressive']:
self.core.expire_caches_by_type(Bcfg2.Server.Plugin.Metadata)
def _load_data_db(self, client=None):
""" Load probe data from the database """
if client is None:
self.probedata = {}
self.cgroups = {}
probedata = ProbesDataModel.objects.all()
groupdata = ProbesGroupsModel.objects.all()
else:
self.probedata.pop(client, None)
self.cgroups.pop(client, None)
probedata = ProbesDataModel.objects.filter(hostname=client)
groupdata = ProbesGroupsModel.objects.filter(hostname=client)
for pdata in probedata:
if pdata.hostname not in self.probedata:
self.probedata[pdata.hostname] = ClientProbeDataSet(
timestamp=time.mktime(pdata.timestamp.timetuple()))
self.probedata[pdata.hostname][pdata.probe] = ProbeData(pdata.data)
for pgroup in groupdata:
if pgroup.hostname not in self.cgroups:
self.cgroups[pgroup.hostname] = []
self.cgroups[pgroup.hostname].append(pgroup.group)
if self.core.metadata_cache_mode in ['cautious', 'aggressive']:
self.core.expire_caches_by_type(Bcfg2.Server.Plugin.Metadata,
key=client)
@Bcfg2.Server.Plugin.track_statistics()
def GetProbes(self, meta):
return self.probes.get_probe_data(meta)
GetProbes.__doc__ = Bcfg2.Server.Plugin.Probing.GetProbes.__doc__
@Bcfg2.Server.Plugin.track_statistics()
def ReceiveData(self, client, datalist):
if self.core.metadata_cache_mode in ['cautious', 'aggressive']:
if client.hostname in self.cgroups:
olddata = copy.copy(self.cgroups[client.hostname])
else:
olddata = []
cgroups = []
cprobedata = ClientProbeDataSet()
for data in datalist:
self.ReceiveDataItem(client, data, cgroups, cprobedata)
self.cgroups[client.hostname] = cgroups
self.probedata[client.hostname] = cprobedata
if (self.core.metadata_cache_mode in ['cautious', 'aggressive'] and
olddata != self.cgroups[client.hostname]):
self.core.metadata_cache.expire(client.hostname)
self.write_data(client)
ReceiveData.__doc__ = Bcfg2.Server.Plugin.Probing.ReceiveData.__doc__
def ReceiveDataItem(self, client, data, cgroups, cprobedata):
"""Receive probe results pertaining to client."""
if data.text is None:
self.logger.info("Got null response to probe %s from %s" %
(data.get('name'), client.hostname))
cprobedata[data.get('name')] = ProbeData('')
return
dlines = data.text.split('\n')
self.logger.debug("Processing probe from %s: %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 cgroups:
if self._group_allowed(newgroup):
cgroups.append(newgroup)
else:
self.logger.info(
"Disallowed group assignment %s from %s" %
(newgroup, client.hostname))
dlines.remove(line)
dobj = ProbeData("\n".join(dlines))
cprobedata[data.get('name')] = dobj
def _group_allowed(self, group):
""" Determine if the named group can be set as a probe group
by checking the regexes listed in the [probes] groups_allowed
setting """
return any(r.match(group) for r in self.allowed_cgroups)
def get_additional_groups(self, meta):
return self.cgroups.get(meta.hostname, list())
get_additional_groups.__doc__ = \
Bcfg2.Server.Plugin.Connector.get_additional_groups.__doc__
def get_additional_data(self, meta):
return self.probedata.get(meta.hostname, ClientProbeDataSet())
get_additional_data.__doc__ = \
Bcfg2.Server.Plugin.Connector.get_additional_data.__doc__
|