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#!/usr/bin/env python
'''This module implements a config file repository'''
__revision__ = '$Revision$'
from binascii import b2a_base64
from os import stat
from re import compile as regcompile
from stat import S_ISDIR, ST_MODE
from Bcfg2.Server.Generator import Generator, DirectoryBacked, FileBacked
from Bcfg2.Server.Metadata import Metadata
class CfgFileException(Exception):
pass
class FileEntry(FileBacked):
'''The File Entry class pertains to the config files contained in a particular directory.
This includes :info, all base files and deltas'''
def __init__(self, name, metadata):
FileBacked.__init__(self, name)
self.metadata = metadata
def Applies(self, other):
'''redirect to metadata.Applies'''
return self.metadata.Applies(other)
def __cmp__(self, other):
'''figure out if self is more or less specific than other'''
return self.metadata.__cmp__(other.metadata)
class ConfigFileEntry(object):
'''ConfigFileEntry is a repository entry for a single file, containing
all data for all clients.'''
mx = regcompile("(^(?P<filename>.*)(\.((B(?P<bprio>\d+)_(?P<bundle>\S+))|(A(?P<aprio>\d+)_(?P<attr>\S+))|(I(?P<iprio>\d+)_(?P<image>\S+))|(I(?P<cprio>\d+)_(?P<class>\S+))|(H_(?P<hostname>\S+)))(\.(?P<op>cat|udiff))?)?$)")
info = regcompile('^owner:(\s)*(?P<owner>\w+)|group:(\s)*(?P<group>\w+)|perms:(\s)*(?P<perms>\w+)|encoding:(\s)*(?P<encoding>\w+)|(?P<paranoid>paranoid(\s)*)$')
def __init__(self, path):
object.__init__(self)
self.path = path
self.basefiles = []
self.deltas = []
self.encoding = 'ascii'
self.owner = 'root'
self.group = 'root'
self.perms = '0644'
self.paranoid = False
def read_info(self, filename):
'''read in :info metadata'''
for line in open(filename).readlines():
match = self.info.match(line)
if not match:
continue
else:
mgd = match.groupdict()
if mgd['owner']:
self.owner = mgd['owner']
elif mgd['group']:
self.group = mgd['group']
elif mgd['encoding']:
self.encoding = mgd['encoding']
elif mgd['perms']:
self.perms = mgd['perms']
if len(self.perms) == 3:
self.perms = "0%s" % (self.perms)
elif mgd['paranoid']:
self.paranoid = True
def AddEntry(self, name):
'''add new file additions for a single cf file'''
if name[-5:] == ':info':
return self.read_info(name)
g = self.mx.match(name)
if g == None:
print "match failed for file name %s" % (name)
return
data = {}
for attr in ['bundle', 'attr', 'hostname', 'class']:
if g.group(attr) != None:
data[attr] = g.group(attr)
if data == {}:
all = True
else:
all = False
# metadata args (global, image, classes, bundles, attributes, hostname)
arg = (all, data.get('image', None))
for mtype in ['class', 'bundle', 'attr']:
arg = arg + (data.get(mtype, []),)
arg = arg + (data.get('hostname', None),)
m = apply(Metadata, arg)
if g.group("op") != None:
self.deltas.append(FileEntry(name, m))
# need to sort here
else:
self.basefiles.append(FileEntry(name, m))
# need to sort here
def HandleEvent(self, event):
'''Handle FAM updates'''
action = event.code2str()
if event.filename[-5:] == ':info':
return self.read_info(event.filename)
for l in [self.basefiles, self.deltas]:
for entry in l:
if entry.name.split('/')[-1] == event.filename:
if action == 'changed':
entry.HandleEvent(event)
elif action == 'deleted':
l.remove(entry)
else:
print "unhandled action %s" % (action)
def GetConfigFile(self, entry, metadata):
'''Fetch config file from repository'''
name = entry.attrib['name']
filedata = ""
# first find basefile
try:
basefile = [x for x in self.basefiles if x.Applies(metadata)][0]
except IndexError:
raise CfgFileException, ('basefile', name)
filedata += basefile.data
# find applicable deltas
deltas = [x for x in self.deltas if x.Applies(metadata)]
# filter for more specific
for delta in deltas:
pass
# apply diffs, etc
entry.attrib.update({'owner':self.owner, 'group':self.group,
'perms':self.perms, 'encoding':self.encoding})
if self.paranoid:
entry.attrib['paranoid'] = 'true'
if self.encoding == 'base64':
entry.text = b2a_base64(filedata)
else:
entry.text = filedata
class ConfigFileRepository(DirectoryBacked):
'''This class implements repos and all change handling'''
def __init__(self, name, fam):
self.name = name
self.fam = fam
self.entries = {}
self.provides = {}
self.famID = {}
self.directories = []
self.AddDirectoryMonitor(self.name)
# eventually flush fam events here so that all entries built here
# ready to go
def AddDirectoryMonitor(self, name):
'''Add new directory to FAM structures'''
if name not in self.directories:
try:
stat(name)
except OSError:
print "Failed to open %s" % (name)
return
reqid = self.fam.AddMonitor(name, self)
self.famID[reqid] = name
self.directories.append(name)
def AddEntry(self, name):
'''Add new entry to FAM structures'''
try:
sdata = stat(name)[ST_MODE]
except OSError:
return
if S_ISDIR(sdata):
self.AddDirectoryMonitor(name)
else:
# file entries shouldn't contain path-to-repo
shortname = '/'+ '/'.join(name[len(self.name)+1:].split('/')[:-1])
if not self.entries.has_key(shortname):
self.entries[shortname] = ConfigFileEntry(shortname)
self.provides[shortname] = self.entries[shortname].GetConfigFile
self.entries[shortname].AddEntry(name)
#self.entries[shortname].HandleEvent()
def HandleEvent(self, event):
'''Handle FAM updates'''
action = event.code2str()
if event.filename[0] != '/':
filename = "%s/%s" % (self.famID[event.requestID], event.filename)
else:
filename = event.filename
if action == 'exists':
if filename != self.name:
self.AddEntry(filename)
elif action == 'created':
self.AddEntry(filename)
elif action == 'changed':
# pass the event down the chain to the ConfigFileEntry
configfile = filename[len(self.name):-(len(event.filename)+1)]
if event.filename == ':info':
event.filename = filename
if self.entries.has_key(configfile):
self.entries[configfile].HandleEvent(event)
else:
syslog(LOG_INFO, "Ignoring event for %s"%(configfile))
elif action == 'deleted':
configfile = filename[len(self.name):-(len(event.filename)+1)]
self.entries[configfile].HandleEvent(event)
elif action in ['endExist']:
pass
else:
print "Got unknown event %s %s %s" % (event.requestID, event.code2str(), event.filename)
class cfg(Generator):
'''This generator manages the configuration file repository for bcfg2'''
__name__ = 'cfg'
__version__ = '$Id$'
__author__ = 'bcfg-dev@mcs.anl.gov'
__provides__ = {}
def __setup__(self):
self.repo = ConfigFileRepository(self.data, self.core.fam)
self.__provides__['ConfigFile'] = self.repo.provides
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