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#!/usr/bin/python
# $Id$
from os import stat
from stat import ST_MODE, S_ISDIR
from syslog import syslog, LOG_ERR
from Error import PublishError
import _fam
class fam(object):
'''The fam object contains alteration monitors'''
def __init__(self):
self.fm = _fam.open()
self.users = {}
self.handles = {}
def fileno(self):
return self.fm.fileno()
def AddMonitor(self, path, obj=None):
m = stat(path)[ST_MODE]
if S_ISDIR(m):
h = self.fm.monitorDirectory(path, None)
self.handles[h.requestID()] = h
else:
h = self.fm.monitorFile(path, None)
self.handles[h.requestID()] = h
if obj != None:
self.users[h.requestID()] = obj
return h.requestID()
def HandleEvent(self):
event = self.fm.nextEvent()
id = event.requestID
if self.users.has_key(id):
self.users[id].HandleEvent(event)
class PublishedValue(object):
def __init__(self,owner,key,value):
self.owner=owner
self.key=key
self.value=value
def Update(self,owner,value):
if owner != self.owner:
raise PublishError, (self.key,owner)
self.value=value
class Core(object):
def __init__(self, repository, structures, generators):
self.datastore = repository
self.fam = fam()
self.pubspace = {}
self.structures = []
for structure in structures:
s = getattr(__import__(structure),structure)
self.structures.append(s(self, self.datastore))
self.generators = []
for generator in generators:
g = getattr(__import__(generator),generator)
self.generators.append(g(self, self.datastore))
# we need to inventory and setup generators
# Process generator requirements
for g in self.generators:
for prq in g.__requires__:
if not self.pubspace.has_key(prq):
raise GeneratorError, (g.name, prq)
g.CompleteSetup()
def PublishValue(self,owner,key,value):
if not self.pubspace.has_key(key):
# This is a new entry
self.pubspace[key]=PublishedValue(owner,key,value)
else:
# This is an old entry. Update can fai
try:
self.pubspace[key].Update(owner,value)
except PublishError,e:
syslog(LOG_ERR, "Publish conflict for %s. Owner %s, Modifier %s"%(key,self.pubspace[key].owner,owner))
def ReadValue(self,key):
if self.pubspace.has_key(key):
return self.pubspace[key].value
raise KeyError,key
def GetEntry(self, key1, key2):
for d in map(lambda x:x.__provides__, self.generators):
if d.has_key(key1):
if d[key1].has_key(key2):
return d[key1][key2]
raise KeyError, (key1, key2)
def GetConfigFile(self,filename,metadata):
try:
self.Get("ConfigFile", filename, metadata)
except:
raise KeyError, filename
def Get(self,type,name,metadata):
return self.GetEntry(type, name)(name, metadata)
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