/usr/lib/python2.7/dist-packages/ControlAula/Classroom.py is in controlaula 1.8.0-3.1.
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# -*- coding: utf-8 -*-
# Project: Controlaula
# Module: Classroom.py
# Purpose: Data of the classroom pcs and its interface
# Language: Python 2.5
# Date: 21-Jan-2010.
# Ver: 27-Jan-2010.
# Author: José L. Redrejo Rodríguez
# Copyright: 2009-2010 - José L. Redrejo Rodríguez <jredrejo @nospam@ debian.org>
#
# ControlAula is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# ControlAula is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with ControlAula. If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################
import datetime,logging
import Desktop
from ControlAula.Utils import Configs, MyUtils,NetworkUtils
from ControlAula.Plugins import VNC,Broadcast
import simplejson as json
from twisted.internet import reactor
from twisted.internet.protocol import Factory
from ClassProtocol import ControlProtocol
from Host import Host
from User import User
class Classroom(object):
"""Classroom data management
"""
def __init__(self,refreshInterval):
"""Initialize classroom data
refreshInterval is the time (in seconds)
for a host or logged pc to be removed from the teacher list
"""
#List of logged users
#Information:
#ip,hostname,classname,ltsp_client,position,visible,internetEnabled,
#loginname,username,mouseEnabled,messagesEnabled,photo,
self.LoggedUsers={}
# Hosts with sirvecole running as root
#Information:
# IP, hostname,classname,ltsp_client,position,visible,internetEnabled,printerShared
self.Hosts={}
#Dictionary with the commands the clients must execute
#Every dictionary entry contains a list with the commands such client must execute
#Information:
#command,command_args
self.CommandStack={}
self.classname=Configs.RootConfigs['classroomname']
#Dictionary with the data of the classroom setup
self.classsetup=Configs.MonitorConfigs.GetClassroomConfig(self.classname)
#ControlProtocol boot up:
pf = Factory()
pf.protocol = ControlProtocol
pf.protocol.add_callback("connected", self.addClient)
pf.protocol.add_callback("alive", self.update_time_stamp)
pf.protocol.add_callback("commands", self.getCommands)
pf.protocol.add_callback("lost", self.removeClient)
try:
reactor.listenTCP(Configs.PORT+1, pf)
except:
reactor.listenTCP(Configs.PORT+2, pf)
#Dictionary with the Desktop positions to send to the frontend
self.cols=int(self.classsetup['cols'])
self.rows=int(self.classsetup['rows'])
self.computers=int(self.classsetup['computers'])
#creates the aula
total=self.cols*self.rows
self.Desktops=[]
for i in range(total):
self.Desktops.append(Desktop.Desktop(self))
#if there is a saved structure, it recovers it:
if self.classsetup['structure']!='':
targets=self.classsetup['structure'].split(',')
for i in range(total):
try:
if targets[i]!='None':
self.Desktops[i].hostname=targets[i]
except:
pass #total is greater than len(targets)
self.interval=refreshInterval
self.oldJSON=''
self.myVNC=VNC.VNC()
self.broadcast=Broadcast.Vlc()
self.current_request=None
def existUser(self,key):
"""Check if a logged user has already been added to the classroom"""
return self.LoggedUsers.has_key(key)
def existPC(self, ip):
"""Check if a pc has already been added to the classroom"""
return self.Hosts.has_key(ip)
def addClient(self, protocol_data, client_data):
is_host_not_user = client_data["isHostnotUser"]
if is_host_not_user:
host = Host(client_data['login'], client_data['hostname'],
client_data['hostip'], client_data['mac'],
client_data['ltsp'], client_data['classname'],
client_data['internetEnabled'], client_data['uuid'])
self.addHost(host)
else:
user = User(client_data['login'], client_data['hostname'],
client_data['hostip'], client_data['ltsp'],
client_data['classname'], client_data['username'],
client_data['ipLTSP'], client_data['internetEnabled'],
client_data['mouseEnabled'], client_data['soundEnabled'],
client_data['messagesEnabled'], client_data['photo'], client_data['uuid'])
self.addUser(user)
def addHost(self, host):
"""Add a pc to the classroom"""
if not self.Hosts.has_key(host.ip):
logging.getLogger().debug('The host %s has appeared' % (host.ip))
self.Hosts[host.ip]=host
#intialize list of commands for this client, if is a LTSP server, it needs to be added
if not self.CommandStack.has_key(host.ip):
self.CommandStack[host.ip]=[]
#save its mac address:
Configs.MonitorConfigs.SaveMAC(host.hostname, host.mac)
if host.hostname!=NetworkUtils.getHostName(): #the teacher host is not added to the list when it's LTSP
self.placeHostDesktop(host.ip)
self.getJSONFrontend("refresh")
def addUser(self,user):
"""Add a logged user to the classroom"""
key = user.login + '@' + user.ip
if not self.LoggedUsers.has_key(key):
logging.getLogger().debug('The user %s has appeared' % (key))
self.LoggedUsers[key]=user
#intialize list of commands for this client
if not self.CommandStack.has_key(key):
self.CommandStack[key]=[]
self.placeUserDesktop(key)
else:
self.LoggedUsers[key].uid=user.uid # The user has reconnected
self.getJSONFrontend("refresh")
def addPhoto(self,path,key):
self.LoggedUsers[key].photo=path
for i in self.Desktops:
if i.userkey==key:
i.photo=path
break
self.getJSONFrontend("refresh")
def removeClient(self, login, hostip):
if login == 'root':
self.removeHost(hostip)
else:
key = login + '@' + hostip
self.removeUser(key)
def removeUser(self, key):
"""Remove a logout user from the classroom data"""
if self.LoggedUsers.has_key(key):
self.LoggedUsers.pop(key)
#self.CommandStack.pop(key)
logging.getLogger().debug('The user %s has disappeared' % key)
for desktop in self.Desktops:
if desktop.userkey==key:
desktop.delUser()
break
self.getJSONFrontend("refresh")
def removeHost(self,hostip):
"""Remove a disconnected pc from the classroom data"""
if self.Hosts.has_key(hostip):
logging.getLogger().debug('The host %s has disappeared' % hostip)
self.Hosts.pop(hostip)
#self.CommandStack.pop(hostip)
self.removeDesktop(hostip)
def addCommand(self,key,command,args=[]):
"""Add a command to be executed by a pc or an user.
Commands without arguments:
bigbrother
projector
enableInternet
disableInternet
enableMouse
disableMouse
sharePrinter
unsharePrinter
enableMessages
disableMessages
wakeup
sleep
Commands with arguments:
broadcast ( "file:///url del archivo", or "dvd")
sendmessage ("text")
sendfile ("file:///url del archivo")
startapplication ("command")
launchweb ("url")
"""
self.CommandStack[key].append((command,args))
def getCommands(self,key):
"""Returns the list of commands to be executed by an user or pc
and remove them from the list"""
if self.CommandStack.has_key(key):
commands=self.CommandStack[key]
self.CommandStack[key]=[]
return commands
else:
return []
def showCommands(self,key):
"""Returns the list of commands to be executed by an user or pc
but keep them in the list"""
if self.CommandStack.has_key(key):
return self.CommandStack[key]
else:
return []
def hasCommands(self,key):
"""Returns True if there are commands to be executed by an user or pc"""
if self.CommandStack.has_key(key):
return self.CommandStack[key] != []
else:
return False
def update_time_stamp(self, login, hostip):
if login == 'root':
self.updateHostTimeStamp(hostip)
else:
key = login + '@' + hostip
self.updateUserTimeStamp(key)
def updateHostTimeStamp(self,hostip):
"""Updates the last time the host contacted the teacher"""
if self.Hosts.has_key(hostip):
self.Hosts[hostip].timestamp = datetime.datetime.now()
def updateUserTimeStamp(self,key):
"""Updated the last time the logged user contacted the teacher"""
if self.LoggedUsers.has_key(key):
self.LoggedUsers[key].timestamp = datetime.datetime.now()
def UpdateLists(self):
"""Remove the users or hosts that haven't contacted the teacher during
the (seconds) interval"""
for i in self.LoggedUsers.keys():
if self.broadcast.broadcasting or self.myVNC.activeBB:
self.updateUserTimeStamp(self.LoggedUsers[i].key)
else:
if self._checkInterval(self.LoggedUsers[i],self.interval):
self.removeUser(i)
for i in self.Hosts.keys():
if self.broadcast.broadcasting or self.myVNC.activeBB:
self.updateHostTimeStamp(self.Hosts[i].ip)
else:
if self._checkInterval(self.Hosts[i],self.interval):
self.removeHost(i)
reactor.callLater(self.interval, self.UpdateLists)
def _checkInterval(self,data,interval):
if self.broadcast.broadcasting or self.myVNC.activeBB:
return False
"""check if current time has passed data timestamp + 3 + interval (in seconds)"""
return (datetime.datetime.now()>data.timestamp+ datetime.timedelta(seconds=(3 +interval)))
def shiftDesktop(self,index):
'''Desktop at position index must be moved to the next free position'''
newPosition=-1
#First, let's try to move it down in the list of Desktops:
for i in range(index+1,self.cols*self.rows-1):
if self.Desktops[i].hostkey=='':
newPosition=i
break
if newPosition==-1:
newPosition= self.placeHostFreely()
self.Desktops[newPosition]=self.Desktops[index]
self.Desktops[index]=Desktop.Desktop(self)
def placeHostFreely(self):
'''returns the first available position in the list of Desktops'''
position=-1
for i in range(self.cols*self.rows):
if self.Desktops[i].hostkey=='':
position=i
break
if position==-1: #There were not free places
position=self.addDesktopsRow()
return position
def addDesktopsRow(self):
newPosition=self.cols*self.rows
self.rows+=1
for i in range(self.cols):
self.Desktops.append(Desktop.Desktop(self))
return newPosition
def removeDesktopsRow(self):
self.rows-=1
position=self.cols*self.rows
for i in range(self.cols):
deleted=self.Desktops.pop(position)
if deleted.hostname !='Unknown':
new_pos=self.findNamePosition(deleted.hostname)
self.Desktops[new_pos]=deleted
def addDesktopsCol(self):
cols=self.cols
self.cols +=1
for i in range(self.rows):
self.Desktops.insert(i*self.cols +cols, Desktop.Desktop(self))
def removeDesktopsCol(self):
cols=self.cols
self.cols-=1
for i in range(self.rows-1,-1,-1):
deleted=self.Desktops.pop(i*cols +self.cols)
if deleted.hostname !='Unknown':
new_pos=self.findNamePosition(deleted.hostname)
self.Desktops[new_pos]=deleted
def placeHostDesktop(self,key):
'''Puts a pc in the list of Desktops, according to its position'''
#first, check if the position is already saved in the classroom setup:
hostname=self.Hosts[key].hostname
position=-1
for i in range(len(self.Desktops)):
if self.Desktops[i].hostname==hostname:
position=i
if self.Desktops[position].hostkey!='':
self.shiftDesktop(position) #The position was busy by a host and it has to be moved
break
if position ==-1:#if it's not in the classroom setup, let's look for somewhere to place it:
position=self.findNamePosition(hostname)
self.Desktops[position].putHost(self.Hosts[key],key)
self.recheckUsersDesktops()
self.saveClassLayout()
def findNamePosition(self,hostname):
position=-1
number=MyUtils.getDesktopNumber(hostname)
if number !='':
position=int(number)
if position >0:
#position -=1
position=len(self.Desktops)-position
if position<1:
position=self.placeHostFreely()
if self.Desktops[position].hostkey!='':
self.shiftDesktop(position) #The position was busy by a host and it has to be moved
else:
position=self.placeHostFreely()
return position
def placeUserDesktop(self,key):
user=self.LoggedUsers[key]
validIP=user.ip
if user.ltsp:
validIP=user.ipLTSP
for desktop in self.Desktops:
if desktop.ip==validIP:
desktop.putUser(user,key)
break
def recheckUsersDesktops(self):
'''If for network issues the user connects before the host,
the user must be added after the host is recognised'''
for user in self.LoggedUsers.keys():
homeless=True
for i in self.Desktops:
if i.userkey==user:
homeless=False
break
if homeless:
self.placeUserDesktop(user)
def removeDesktop(self,ip):
for desktop in self.Desktops:
if desktop.mainIP==ip:
desktop.delHost()
break
self.getJSONFrontend("refresh")
def getJSONFrontend(self,oldList):
classroom={}
classroom['pclist']=[]
classroom['structure']={'classname':self.classname,'cols':self.cols,'rows':self.rows,'computers':self.computers}
for i in self.Desktops:
classroom['pclist'].append(i.getFrontendInfo())
newJSON=json.dumps({'classroom':classroom})
oldClass={'pclist':oldList}
oldClass['structure']={'classname':self.classname,'cols':self.cols,'rows':self.rows,'computers':self.computers}
self.oldJSON=json.dumps({'classroom':oldClass})
if self.myVNC.activeBB:
self.oldJSON=''
if newJSON==self.oldJSON:
classroom['pclist']=[]
newJSON=json.dumps({'classroom':classroom})
else:
self.oldJSON=newJSON
if self.current_request!=None:
if not self.current_request.finished:
self.current_request.write(newJSON)
self.current_request.finish()
else:
reactor.callLater(2,self.getJSONFrontend,"refresh")
return newJSON
def redistributeDesktops(self,targets,save=True):
total=min(len(targets),len(self.Desktops))
for i in range (total):
name=targets[i]
if name==' ':
name='none'
if name=='None':
name='Unknown'
if name!=self.Desktops[i].hostname:
self.moveDesktopAt(name,i)
if save: self.saveClassLayout()
def moveDesktopAt(self, desktop_name,position):
'''Move a Destkop in the list of Desktops at a fixed position'''
previousDesktop=self.Desktops[position]
oldposition=-1
for i in range(len(self.Desktops)):
if self.Desktops[i].hostname==desktop_name:
newDesktop=self.Desktops[i]
oldposition=i
break
#makes the moving:
if oldposition >-1: #there was a desktop previously on that place
self.Desktops[oldposition]=previousDesktop
self.Desktops[position]=newDesktop
def saveClassLayout(self):
layout=''
for desktop in self.Desktops:
layout +=',' + desktop.hostname
self.classsetup['structure']=layout[1:]
self.classsetup['rows']=str(self.rows)
self.classsetup['cols']=str(self.cols)
self.classsetup['computers']=str(self.computers)
Configs.MonitorConfigs.SetClassroomConfig(self.classname,self.classsetup)
self.getJSONFrontend("refresh")
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