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# distributed with this work for additional information
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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
# 
#   http://www.apache.org/licenses/LICENSE-2.0
# 
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.    

import subprocess
import time
#XXXstroucki getImages requires os?
import os
from tashi.rpycservices.rpyctypes import Errors, Network, Host, User, Instance, TashiException, LocalImages, DiskConfiguration, NetworkConfiguration
from tashi.util import stringPartition, boolean, instantiateImplementation, humanReadable
from tashi.rpycservices.rpyctypes import User
from tashi.clustermanager.data import DataInterface

class LdapOverride(DataInterface):
	def __init__(self, config):
		DataInterface.__init__(self, config)
		self.baseDataObject = instantiateImplementation(config.get("LdapOverride", "baseData"), config)
		self.users = {}
		self.lastUserUpdate = 0.0
		self.fetchThreshold = float(config.get("LdapOverride", "fetchThreshold"))
		self.nameKey = config.get("LdapOverride", "nameKey")
		self.idKey = config.get("LdapOverride", "idKey")
		self.ldapCommand = config.get("LdapOverride", "ldapCommand")
		self.dfs = instantiateImplementation(config.get("ClusterManager", "dfs"), config)
	
	def registerInstance(self, instance):
		return self.baseDataObject.registerInstance(instance)
	
	def acquireInstance(self, instanceId):
		return self.baseDataObject.acquireInstance(instanceId)
	
	def releaseInstance(self, instance):
		return self.baseDataObject.releaseInstance(instance)
	
	def removeInstance(self, instance):
		return self.baseDataObject.removeInstance(instance)
	
	def acquireHost(self, hostId):
		return self.baseDataObject.acquireHost(hostId)
	
	def releaseHost(self, host):
		return self.baseDataObject.releaseHost(host)
	
	def getHosts(self):
		return self.baseDataObject.getHosts()
	
	def getHost(self, id):
		return self.baseDataObject.getHost(id)
	
	def getInstances(self):
		return self.baseDataObject.getInstances()
	
	def getInstance(self, id):
		return self.baseDataObject.getInstance(id)
	
	def getNetworks(self):
		return self.baseDataObject.getNetworks()
	
	def getNetwork(self, id):
		return self.baseDataObject.getNetwork(id)

	def getImages(self):
		count = 0
		myList = []
		for i in self.dfs.list("images"):
			myFile = self.dfs.getLocalHandle("images/" + i)
			if os.path.isfile(myFile):
				image = LocalImages(d={'id':count, 'imageName':i, 'imageSize':humanReadable(self.dfs.stat(myFile)[6])})
				myList.append(image)
				count += 1
		return myList

	def fetchFromLdap(self):
		now = time.time()
		if (now - self.lastUserUpdate > self.fetchThreshold):
			myUsers = {}
			#p = subprocess.Popen("getent passwd".split(), stdout=subprocess.PIPE)
			p = subprocess.Popen(self.ldapCommand.split(), stdout=subprocess.PIPE)
			try:
				thisUser = {}
				for l in p.stdout.xreadlines():
					try:
						if (l.startswith("#")):
							if (self.nameKey in thisUser):
								user = User()
								user.id = int(thisUser[self.idKey])
								user.name = thisUser[self.nameKey]
								myUsers[user.id] = user
							thisUser = {}
						else:
							(key, sep, val) = l.partition(":")
							key = key.strip()
							val = val.strip()
							thisUser[key] = val
					except:
						pass
				self.users = myUsers
				self.lastUserUpdate = now
			finally:
				p.wait()
	
	def getUsers(self):
		self.fetchFromLdap()
		return self.users
	
	def getUser(self, id):
		self.fetchFromLdap()
		return self.users[id]
		
	def registerHost(self, hostname, memory, cores, version):
		return self.baseDataObject.registerHost(hostname, memory, cores, version)
	
	def unregisterHost(self, hostId):
		return self.baseDataObject.unregisterHost(hostId)