/usr/share/pyshared/ControlAula/Plugins/DownloadFiles.py is in ltsp-controlaula 1.8.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# -*- coding: utf-8 -*-
# Project: Controlaula
# Module: DownloadFiles.py
# Purpose: Module to download files from the teacher
# Language: Python 2.5
# Date: 9-Mar-20010.
# Ver.: 10-Mar-2010.
# Copyright: 2009-2010 - José L. Redrejo RodrÃguez <jredrejo @nospam@ debian.org>
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################
from twisted.web import client
from twisted.internet.defer import Deferred,DeferredList
from twisted.internet import reactor
from ControlAula.Utils import MyUtils
class DownloadQueue(object):
#maximum simultaneous downloads:
SIZE = 50
def __init__(self):
self.requests = [] # queued requests
self.deferreds = [] # waiting requests
def addRequest(self, uri, file,exitfunc):
self.exitfunc=exitfunc
if len(self.deferreds) >= self.SIZE:
# wait for completion of all previous requests
DeferredList(self.deferreds
).addCallback(self._callback)
self.deferreds = []
# queue the request
deferred = Deferred()
self.requests.append((uri, file,deferred))
return deferred
else:
# execute the request now
#deferred = downloadPage(url, file)
host, port, url = MyUtils.parse(uri)
f = client.HTTPDownloader(uri, file)
f.deferred.addCallbacks(callback=self.exitfunc,
callbackArgs=(file,) )
self.deferreds.append(f.deferred)
reactor.connectTCP(host, port, f)
return f.deferred
def _callback(self):
if len(self.requests) >self.SIZE:
queue = self.requests[:self.SIZE]
self.requests = self.requests[self.SIZE:]
else:
queue = self.requests[:]
self.requests = []
# execute the requests
for (uri,file, deferredHelper) in queue:
host, port, url = MyUtils.parse(uri)
f = client.HTTPDownloader(uri, file)
f.deferred.addCallbacks(callback=self.exitfunc, callbackArgs=(file,))
self.deferreds.append(f.deferred)
reactor.connectTCP(host, port, f)
f.deferred.chainDeferred(deferredHelper)
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