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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.Cache
import Bcfg2.Server.Plugin
from Bcfg2.Compat import unicode # pylint: disable=W0622
import Bcfg2.Server.FileMonitor
from Bcfg2.Logger import Debuggable
from Bcfg2.Server.Statistics import track_statistics
HAS_DJANGO = False
# pylint: disable=C0103
ProbesDataModel = None
ProbesGroupsModel = None
# pylint: enable=C0103
def load_django_models():
""" Load models for Django after option parsing has completed """
# pylint: disable=W0602
global ProbesDataModel, ProbesGroupsModel, HAS_DJANGO
# pylint: enable=W0602
try:
from django.db import models
HAS_DJANGO = True
except ImportError:
HAS_DJANGO = False
return
class ProbesDataModel(models.Model, # pylint: disable=W0621,W0612
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, # pylint: disable=W0621,W0612
Bcfg2.Server.Plugin.PluginDatabaseModel):
""" The database model for storing probe groups """
hostname = models.CharField(max_length=255)
group = models.CharField(max_length=255)
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 ProbeStore(Debuggable):
""" Caching abstraction layer between persistent probe data
storage and the Probes plugin."""
def __init__(self, core, datastore): # pylint: disable=W0613
Debuggable.__init__(self)
self._groupcache = Bcfg2.Server.Cache.Cache("Probes", "probegroups")
self._datacache = Bcfg2.Server.Cache.Cache("Probes", "probedata")
def get_groups(self, hostname):
""" Get the list of groups for the given host """
if hostname not in self._groupcache:
self._load_groups(hostname)
return self._groupcache.get(hostname, [])
def set_groups(self, hostname, groups):
""" Set the list of groups for the given host """
raise NotImplementedError
def get_data(self, hostname):
""" Get a dict of probe data for the given host """
if hostname not in self._datacache:
self._load_data(hostname)
return self._datacache.get(hostname, dict())
def set_data(self, hostname, data):
""" Set probe data for the given host """
raise NotImplementedError
def _load_groups(self, hostname):
""" When probe groups are not found in the cache, this
function is called to load them from the backend (XML or
database). """
raise NotImplementedError
def _load_data(self, hostname):
""" When probe groups are not found in the cache, this
function is called to load them from the backend (XML or
database). """
raise NotImplementedError
def commit(self):
""" Commit the current data in the cache to the persistent
backend store. This is not used with the
:class:`Bcfg2.Server.Plugins.Probes.DBProbeStore`, because it
commits on every change. """
pass
class DBProbeStore(ProbeStore, Bcfg2.Server.Plugin.DatabaseBacked):
""" Caching abstraction layer between the database and the Probes
plugin. """
create = False
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.DatabaseBacked.__init__(self, core, datastore)
ProbeStore.__init__(self, core, datastore)
def _load_groups(self, hostname):
Bcfg2.Server.Cache.expire("Probes", "probegroups", hostname)
groupdata = ProbesGroupsModel.objects.filter(hostname=hostname)
self._groupcache[hostname] = list(set(r.group for r in groupdata))
Bcfg2.Server.Cache.expire("Metadata", hostname)
@Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
def set_groups(self, hostname, groups):
Bcfg2.Server.Cache.expire("Probes", "probegroups", hostname)
olddata = self._groupcache.get(hostname, [])
self._groupcache[hostname] = groups
for group in groups:
try:
ProbesGroupsModel.objects.get_or_create(
hostname=hostname,
group=group)
except ProbesGroupsModel.MultipleObjectsReturned:
ProbesGroupsModel.objects.filter(hostname=hostname,
group=group).delete()
ProbesGroupsModel.objects.get_or_create(
hostname=hostname,
group=group)
ProbesGroupsModel.objects.filter(
hostname=hostname).exclude(group__in=groups).delete()
if olddata != groups:
Bcfg2.Server.Cache.expire("Metadata", hostname)
def _load_data(self, hostname):
Bcfg2.Server.Cache.expire("Probes", "probegroups", hostname)
Bcfg2.Server.Cache.expire("Probes", "probedata", hostname)
self._datacache[hostname] = ClientProbeDataSet()
ts_set = False
for pdata in ProbesDataModel.objects.filter(hostname=hostname):
if not ts_set:
self._datacache[hostname].timestamp = \
time.mktime(pdata.timestamp.timetuple())
ts_set = True
self._datacache[hostname][pdata.probe] = ProbeData(pdata.data)
Bcfg2.Server.Cache.expire("Metadata", hostname)
@Bcfg2.Server.Plugin.DatabaseBacked.get_db_lock
def set_data(self, hostname, data):
Bcfg2.Server.Cache.expire("Probes", "probedata", hostname)
self._datacache[hostname] = ClientProbeDataSet()
expire_metadata = False
for probe, pdata in data.items():
self._datacache[hostname][probe] = pdata
record, created = ProbesDataModel.objects.get_or_create(
hostname=hostname,
probe=probe)
expire_metadata |= created
if record.data != pdata:
record.data = pdata
record.save()
expire_metadata = True
qset = ProbesDataModel.objects.filter(
hostname=hostname).exclude(probe__in=data.keys())
if len(qset):
qset.delete()
expire_metadata = True
if expire_metadata:
Bcfg2.Server.Cache.expire("Metadata", hostname)
class XMLProbeStore(ProbeStore):
""" Caching abstraction layer between ``probed.xml`` and the
Probes plugin."""
def __init__(self, core, datastore):
ProbeStore.__init__(self, core, datastore)
self._fname = os.path.join(datastore, 'probed.xml')
self._load_data()
def _load_data(self, _=None):
""" Load probe data from probed.xml """
Bcfg2.Server.Cache.expire("Probes", "probegroups")
Bcfg2.Server.Cache.expire("Probes", "probedata")
if not os.path.exists(self._fname):
self.commit()
try:
data = lxml.etree.parse(self._fname,
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
for client in data.getchildren():
self._datacache[client.get('name')] = \
ClientProbeDataSet(timestamp=client.get("timestamp"))
self._groupcache[client.get('name')] = []
for pdata in client:
if pdata.tag == 'Probe':
self._datacache[client.get('name')][pdata.get('name')] = \
ProbeData(pdata.get("value"))
elif pdata.tag == 'Group':
self._groupcache[client.get('name')].append(
pdata.get('name'))
Bcfg2.Server.Cache.expire("Metadata")
def _load_groups(self, hostname):
self._load_data(hostname)
def commit(self):
""" Write received probe data to probed.xml """
top = lxml.etree.Element("Probed")
for client, probed in sorted(self._datacache.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=self._datacache[client][probe].decode('utf-8'))
except AttributeError:
lxml.etree.SubElement(
ctag, 'Probe', name=probe,
value=self._datacache[client][probe])
for group in sorted(self._groupcache[client]):
lxml.etree.SubElement(ctag, "Group", name=group)
try:
top.getroottree().write(self._fname,
xml_declaration=False,
pretty_print='true')
except IOError:
err = sys.exc_info()[1]
self.logger.error("Failed to write probed.xml: %s" % err)
def set_groups(self, hostname, groups):
Bcfg2.Server.Cache.expire("Probes", "probegroups", hostname)
olddata = self._groupcache.get(hostname, [])
self._groupcache[hostname] = groups
if olddata != groups:
Bcfg2.Server.Cache.expire("Metadata", hostname)
def set_data(self, hostname, data):
Bcfg2.Server.Cache.expire("Probes", "probedata", hostname)
self._datacache[hostname] = ClientProbeDataSet()
expire_metadata = False
for probe, pdata in data.items():
olddata = self._datacache[hostname].get(probe, ProbeData(''))
self._datacache[hostname][probe] = pdata
expire_metadata |= olddata != data
if expire_metadata:
Bcfg2.Server.Cache.expire("Metadata", hostname)
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, plugin_name):
self.plugin_name = plugin_name
Bcfg2.Server.Plugin.EntrySet.__init__(self, r'[0-9A-Za-z_\-]+', path,
Bcfg2.Server.Plugin.SpecificData)
Bcfg2.Server.FileMonitor.get_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.Connector,
Bcfg2.Server.Plugin.DatabaseBacked):
""" A plugin to gather information from a client machine """
__author__ = 'bcfg-dev@mcs.anl.gov'
groupline_re = re.compile(r'^group:\s*(?P<groupname>\S+)\s*')
options = [
Bcfg2.Options.BooleanOption(
cf=('probes', 'use_database'), dest="probes_db",
help="Use database capabilities of the Probes plugin")]
options_parsed_hook = staticmethod(load_django_models)
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Probing.__init__(self)
Bcfg2.Server.Plugin.Connector.__init__(self)
Bcfg2.Server.Plugin.DatabaseBacked.__init__(self, core, datastore)
try:
self.probes = ProbeSet(self.data, self.name)
except:
err = sys.exc_info()[1]
raise Bcfg2.Server.Plugin.PluginInitError(err)
if self._use_db:
self.probestore = DBProbeStore(core, datastore)
else:
self.probestore = XMLProbeStore(core, datastore)
@track_statistics()
def GetProbes(self, metadata):
return self.probes.get_probe_data(metadata)
@track_statistics()
def ReceiveData(self, client, datalist):
cgroups = set()
cdata = dict()
for data in datalist:
groups, cdata[data.get("name")] = \
self.ReceiveDataItem(client, data)
cgroups.update(groups)
self.probestore.set_groups(client.hostname, list(cgroups))
self.probestore.set_data(client.hostname, cdata)
self.probestore.commit()
def ReceiveDataItem(self, client, data):
""" Receive probe results pertaining to client. Returns a
tuple of (<probe groups>, <probe data>). """
if data.text is None:
self.logger.info("Got null response to probe %s from %s" %
(data.get('name'), client.hostname))
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]))
groups = []
for line in dlines[:]:
match = self.groupline_re.match(line)
if match:
groups.append(match.group("groupname"))
dlines.remove(line)
return (groups, ProbeData("\n".join(dlines)))
def get_additional_groups(self, metadata):
return self.probestore.get_groups(metadata.hostname)
def get_additional_data(self, metadata):
return self.probestore.get_data(metadata.hostname)
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