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'''Bcfg2.Server.Core provides the runtime support for bcfg2 modules'''
__revision__ = '$Revision$'
from time import time
from Bcfg2.Server.Plugin import PluginInitError, PluginExecutionError
import Bcfg2.Server.FileMonitor
import copy, logging, lxml.etree, os
import Bcfg2.Server.Plugins.Metadata
logger = logging.getLogger('Bcfg2.Core')
try:
import psyco
psyco.full()
except:
pass
class CoreInitError(Exception):
'''This error is raised when the core cannot be initialized'''
pass
class Core(object):
'''The Core object is the container for all Bcfg2 Server logic, and modules'''
def __init__(self, repo, plugins, password, svn, encoding,
filemonitor='default'):
object.__init__(self)
self.datastore = repo
if filemonitor not in Bcfg2.Server.FileMonitor.available:
logger.error("File monitor driver %s not available; forcing to default" % filemonitor)
filemonitor = 'default'
try:
self.fam = Bcfg2.Server.FileMonitor.available[filemonitor]()
except IOError:
raise CoreInitError, "failed to instantiate fam driver (used %s)" % \
filemonitor
self.pubspace = {}
self.cron = {}
self.plugins = {}
self.revision = '-1'
self.password = password
self.svn = svn
self.encoding = encoding
try:
if self.svn:
self.read_svn_revision()
except:
self.svn = False
if '' in plugins:
plugins.remove('')
for plugin in plugins:
if not plugin in self.plugins:
self.init_plugins(plugin)
mlist = [p for p in self.plugins.values() if \
isinstance(p, Bcfg2.Server.Plugin.Metadata)]
if len(mlist) == 1:
self.metadata = mlist[0]
else:
raise CoreInitError, "No Metadata Plugin"
self.statistics = [plugin for plugin in self.plugins.values() \
if isinstance(plugin, Bcfg2.Server.Plugin.Statistics)]
self.pull_sources = [plugin for plugin in self.statistics if \
isinstance(plugin, Bcfg2.Server.Plugin.PullSource)]
self.generators = [plugin for plugin in self.plugins.values() if \
isinstance(plugin, Bcfg2.Server.Plugin.Generator)]
self.structures = [plugin for plugin in self.plugins.values() if \
isinstance(plugin, Bcfg2.Server.Plugin.Structure)]
self.connectors = [plugin for plugin in self.plugins.values() if \
isinstance(plugin, Bcfg2.Server.Plugin.Connector)]
def init_plugins(self, plugin):
try:
mod = getattr(__import__("Bcfg2.Server.Plugins.%s" %
(plugin)).Server.Plugins, plugin)
except ImportError, e:
logger.error("Failed to load plugin %s: %s" % (plugin, e))
return
plug = getattr(mod, plugin)
if plug.experimental:
logger.info("Loading experimental plugin %s" % (plugin))
logger.info("NOTE: Interface subject to change")
try:
self.plugins[plugin] = plug(self, self.datastore)
except PluginInitError:
logger.error("Failed to instantiate plugin %s" % (plugin))
except:
logger.error("Unexpected instantiation failure for plugin %s" %
(plugin), exc_info=1)
def validate_data(self, metadata, data, base_cls):
for plugin in self.plugins.values():
if isinstance(plugin, base_cls):
try:
if base_cls == Bcfg2.Server.Plugin.StructureValidator:
plugin.validate_structures(metadata, data)
elif base_cls == Bcfg2.Server.Plugin.GoalValidator:
plugin.validate_goals(metadata, data)
except Bcfg2.Server.Plugin.ValidationError, err:
logger.error("Plugin %s structure validation failed: %s" \
% (plugin.name, err.message))
raise
except:
logger.error("Plugin %s: unexpected structure val failure" \
% (plugin.name), exc_info=1)
def GetStructures(self, metadata):
'''Get all structures for client specified by metadata'''
return reduce(lambda x, y:x+y,
[struct.BuildStructures(metadata) for struct \
in self.structures], [])
def BindStructure(self, structure, metadata):
'''Bind a complete structure'''
for entry in structure.getchildren():
if entry.tag.startswith("Bound"):
entry.tag = entry.tag[5:]
continue
try:
self.Bind(entry, metadata)
except PluginExecutionError:
logger.error("Failed to bind entry: %s %s" % \
(entry.tag, entry.get('name')))
except:
logger.error("Unexpected failure in BindStructure: %s %s" \
% (entry.tag, entry.get('name')), exc_info=1)
def Bind(self, entry, metadata):
'''Bind an entry using the appropriate generator'''
if 'altsrc' in entry.attrib:
oldname = entry.get('name')
entry.set('name', entry.get('altsrc'))
entry.set('realname', oldname)
del entry.attrib['altsrc']
try:
ret = self.Bind(entry, metadata)
entry.set('name', oldname)
del entry.attrib['realname']
return ret
except:
entry.set('name', oldname)
logger.error("Failed binding entry %s:%s with altsrc %s" \
% (entry.tag, entry.get('name'),
entry.get('altsrc')))
logger.error("Falling back to %s:%s" % (entry.tag,
entry.get('name')))
glist = [gen for gen in self.generators if
entry.get('name') in gen.Entries.get(entry.tag, {})]
if len(glist) == 1:
return glist[0].Entries[entry.tag][entry.get('name')](entry, metadata)
elif len(glist) > 1:
generators = ", ".join([gen.name for gen in glist])
logger.error("%s %s served by multiple generators: %s" % \
(entry.tag, entry.get('name'), generators))
g2list = [gen for gen in self.generators if gen.HandlesEntry(entry)]
if len(g2list) == 1:
return g2list[0].HandleEntry(entry, metadata)
raise PluginExecutionError, (entry.tag, entry.get('name'))
def BuildConfiguration(self, client):
'''Build Configuration for client'''
start = time()
config = lxml.etree.Element("Configuration", version='2.0', revision=self.revision)
try:
meta = self.build_metadata(client)
except Bcfg2.Server.Plugins.Metadata.MetadataConsistencyError:
logger.error("Metadata consistency error for client %s" % client)
return lxml.etree.Element("error", type='metadata error')
try:
structures = self.GetStructures(meta)
except:
logger.error("error in GetStructures", exc_info=1)
return lxml.etree.Element("error", type='structure error')
self.validate_data(meta, structures,
Bcfg2.Server.Plugin.StructureValidator)
# Perform altsrc consistency checking
esrcs = {}
for struct in structures:
for entry in struct:
key = (entry.tag, entry.get('name'))
if key in esrcs:
if esrcs[key] != entry.get('altsrc'):
logger.error("Found inconsistent altsrc mapping for entry %s:%s" % key)
else:
esrcs[key] = entry.get('altsrc', None)
del esrcs
for astruct in structures:
try:
self.BindStructure(astruct, meta)
config.append(astruct)
except:
logger.error("error in BindStructure", exc_info=1)
self.validate_data(meta, config, Bcfg2.Server.Plugin.GoalValidator)
logger.info("Generated config for %s in %s seconds" % \
(client, time() - start))
return config
def Service(self):
'''Perform periodic update tasks'''
count = self.fam.Service()
if count and self.svn:
self.read_svn_revision()
def read_svn_revision(self):
'''Read svn revision information for the bcfg2 repository'''
try:
data = os.popen("env LC_ALL=C svn info %s" \
% (self.datastore)).readlines()
revline = [line.split(': ')[1].strip() for line in data \
if line[:9] == 'Revision:'][-1]
self.revision = revline
except IndexError:
logger.error("Failed to read svn info; disabling svn support")
logger.error('''Ran command "svn info %s"''' % (self.datastore))
logger.error("Got output: %s" % data)
self.svn = False
def GetDecisions(self, metadata, mode):
result = []
for plugin in self.plugins.values():
try:
if isinstance(plugin, Bcfg2.Server.Plugin.Decision):
result += plugin.GetDecisions(metadata, mode)
except:
logger.error("Plugin: %s failed to generate decision list" \
% plugin.name, exc_info=1)
return result
def build_metadata(self, client_name):
imd = self.metadata.get_initial_metadata(client_name)
for conn in self.connectors:
grps, data = conn.get_additional_metadata(imd)
self.metadata.merge_additional_metadata(imd, conn.name, grps, data)
return imd
def process_statistics(self, client_name, statistics):
meta = self.build_metadata(client_name)
state = statistics.find(".//Statistics")
if state.get('version') >= '2.0':
for plugin in self.statistics:
mc = copy.deepcopy(meta)
ms = copy.deepcopy(statistics)
try:
plugin.process_statistics(mc, ms)
except:
logger.error("Plugin %s failed to process stats from %s" \
% (plugin.name, mc.hostname),
exc_info=1)
logger.info("Client %s reported state %s" % (client_name,
state.get('state')))
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