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#!/usr/bin/python
# $Id$
from syslog import syslog, LOG_ERR
from Error import PublishError
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, generators):
self.datastore = repository
self.provides = {'Service':{},'ConfigFile':{},'Packages':{}}
self.pubspace = {}
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()
for etype in g.__provides__.keys():
for entry in g.__provides__[etype]:
self.provides[etype][entry] = getattr(g,g.__provides__[etype][entry])
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 GetConfigFile(self,filename,client):
if self.handles.has_key(filename):
return self.handles[filename].Build(filename,client)
raise KeyError, filename
def Get(self,type,name,client):
f = self.provides[type][name]
return f(name,client)
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