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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 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, structures, generators, password, svn,
encoding, filemonitor='default'):
object.__init__(self)
self.datastore = repo
try:
self.fam = Bcfg2.Server.FileMonitor.available[filemonitor]()
except IOError:
raise CoreInitError, "failed to instantiate fam driver (used %s)" % \
filemonitor
self.pubspace = {}
self.generators = []
self.structures = []
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
[data.remove('') for data in [plugins, structures, generators] if '' in data]
for plugin in structures + generators + plugins:
if not self.plugins.has_key(plugin):
self.init_plugins(plugin)
chk_plugins = self.plugins.values()
while True:
try:
plugin = chk_plugins.pop()
if isinstance(plugin, Bcfg2.Server.Plugin.MetadataPlugin):
self.metadata = plugin
break
except:
pass
if not chk_plugins:
self.init_plugins("Metadata")
self.metadata = self.plugins["Metadata"]
break
chk_plugins = self.plugins.values()
while True:
try:
plugin = chk_plugins.pop()
if isinstance(plugin, Bcfg2.Server.Plugin.StatisticsPlugin):
self.stats = plugin
break
except:
pass
if not chk_plugins:
self.init_plugins("Statistics")
self.stats = self.plugins["Statistics"]
break
for plug_names, plug_tname, plug_type, collection in \
[(structures, 'structure', Bcfg2.Server.Plugin.StructurePlugin,
self.structures),
(generators, 'generator', Bcfg2.Server.Plugin.GeneratorPlugin,
self.generators)]:
for plugin in plug_names:
if plugin in self.plugins:
if not isinstance(self.plugins[plugin], plug_type):
logger.error("Plugin %s is not a %s plugin; unloading" \
% (plugin, plug_tname))
del self.plugins[plugin]
else:
collection.append(self.plugins[plugin])
else:
logger.error("Plugin %s not loaded. Not enabled as a %s" \
% (plugin, plug_tname))
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 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
gen.Entries.get(entry.tag, {}).has_key(entry.get('name'))]
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.metadata.get_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')
if self.plugins.has_key('Deps'):
# do prereq processing
prereqs = self.plugins['Deps'].GeneratePrereqs(structures, meta)
structures.append(prereqs)
# 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)
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()
try:
self.stats.WriteBack()
except:
logger.error("error in Statistics", exc_info=1)
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.DecisionPlugin):
result += plugin.GetDecisions(metadata, mode)
except:
logger.error("Plugin: %s failed to generate decision list" % plugin.__name__, exc_info=1)
return result
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