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cupspykota @ 2308

Revision 2308, 37.1 kB (checked in by jerome, 19 years ago)
Extended syntax for the denyduplicates directive : it now allows any external command to be launched, which will decide if the dupes should be allowed or not.
Property svn:eol-style set to `native` Property svn:executable set to ``* Property svn:keywords set to `Author Date Id Revision`

Rev	Line
[1177]	1	#! /usr/bin/env python
	2	# -- coding: ISO-8859-15 --
	3
	4	# CUPSPyKota accounting backend
	5	#
	6	# PyKota - Print Quotas for CUPS and LPRng
	7	#
[2028]	8	# (c) 2003, 2004, 2005 Jerome Alet <alet@librelogiciel.com>
[1177]	9	# This program is free software; you can redistribute it and/or modify
	10	# it under the terms of the GNU General Public License as published by
	11	# the Free Software Foundation; either version 2 of the License, or
	12	# (at your option) any later version.
	13	#
	14	# This program is distributed in the hope that it will be useful,
	15	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	# GNU General Public License for more details.
	18	#
	19	# You should have received a copy of the GNU General Public License
	20	# along with this program; if not, write to the Free Software
[2303]	21	# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
[1177]	22	#
	23	# $Id$
	24	#
[2066]	25	#
[1177]	26
	27	import sys
	28	import os
[2164]	29	import errno
	30	import tempfile
[1182]	31	import popen2
[1178]	32	import cStringIO
	33	import shlex
[1182]	34	import select
	35	import signal
[1291]	36	import time
[1177]	37
[1546]	38	from pykota.tool import PyKotaFilterOrBackend, PyKotaToolError, crashed
[1177]	39	from pykota.config import PyKotaConfigError
	40	from pykota.storage import PyKotaStorageError
[1196]	41	from pykota.accounter import PyKotaAccounterError
[2254]	42	from pykota.ipp import IPPMessage, IPPError
[1271]	43
[1478]	44	class PyKotaPopen4(popen2.Popen4) :
[1182]	45	"""Our own class to execute real backends.
	46
	47	Their first argument is different from their path so using
	48	native popen2.Popen3 would not be feasible.
	49	"""
[1478]	50	def __init__(self, cmd, bufsize=-1, arg0=None) :
[1182]	51	self.arg0 = arg0
[1478]	52	popen2.Popen4.__init__(self, cmd, bufsize)
[1182]	53
	54	def _run_child(self, cmd):
[1704]	55	try :
	56	MAXFD = os.sysconf("SC_OPEN_MAX")
	57	except (AttributeError, ValueError) :
	58	MAXFD = 256
	59	for i in range(3, MAXFD) :
[1182]	60	try:
	61	os.close(i)
	62	except OSError:
	63	pass
	64	try:
	65	os.execvpe(cmd[0], [self.arg0 or cmd[0]] + cmd[1:], os.environ)
	66	finally:
	67	os._exit(1)
	68
[1271]	69	class PyKotaBackend(PyKotaFilterOrBackend) :
	70	"""A class for the pykota backend."""
	71	def acceptJob(self) :
	72	"""Returns the appropriate exit code to tell CUPS all is OK."""
	73	return 0
	74
	75	def removeJob(self) :
	76	"""Returns the appropriate exit code to let CUPS think all is OK.
[1177]	77
[1271]	78	Returning 0 (success) prevents CUPS from stopping the print queue.
	79	"""
	80	return 0
[1222]	81
[2060]	82	def genBanner(self, bannerfileorcommand) :
	83	"""Reads a banner or generates one through an external command.
	84
	85	Returns the banner's content in a format which MUST be accepted
	86	by the printer.
	87	"""
	88	if bannerfileorcommand :
	89	banner = "" # no banner by default
	90	if os.access(bannerfileorcommand, os.X_OK) or not os.path.isfile(bannerfileorcommand) :
	91	self.logdebug("Launching %s to generate a banner." % bannerfileorcommand)
	92	child = popen2.Popen3(bannerfileorcommand, capturestderr=1)
	93	banner = child.fromchild.read()
	94	child.tochild.close()
	95	child.childerr.close()
	96	child.fromchild.close()
	97	status = child.wait()
	98	if os.WIFEXITED(status) :
	99	status = os.WEXITSTATUS(status)
	100	self.printInfo(_("Banner generator %s exit code is %s") % (bannerfileorcommand, str(status)))
	101	else :
	102	self.logdebug("Using %s as the banner." % bannerfileorcommand)
	103	try :
	104	fh = open(bannerfileorcommand, 'r')
	105	except IOError, msg :
	106	self.printInfo("Impossible to open %s : %s" % (bannerfileorcommand, msg), "error")
	107	else :
	108	banner = fh.read()
	109	fh.close()
	110	if banner :
	111	return cStringIO.StringIO(banner)
	112
	113	def startingBanner(self, printername) :
	114	"""Retrieves a starting banner for current printer and returns its content."""
	115	self.logdebug("Retrieving starting banner...")
	116	return self.genBanner(self.config.getStartingBanner(printername))
	117
	118	def endingBanner(self, printername) :
	119	"""Retrieves an ending banner for current printer and returns its content."""
	120	self.logdebug("Retrieving ending banner...")
	121	return self.genBanner(self.config.getEndingBanner(printername))
	122
[1901]	123	def getCupsConfigDirectives(self, directives=[]) :
[1902]	124	"""Retrieves some CUPS directives from its configuration file.
	125
	126	Returns a mapping with lowercased directives as keys and
	127	their setting as values.
	128	"""
[1901]	129	dirvalues = {}
[1502]	130	cupsroot = os.environ.get("CUPS_SERVERROOT", "/etc/cups")
	131	cupsdconf = os.path.join(cupsroot, "cupsd.conf")
	132	try :
	133	conffile = open(cupsdconf, "r")
	134	except IOError :
[1503]	135	self.logdebug("Unable to open %s" % cupsdconf)
[1502]	136	else :
	137	for line in conffile.readlines() :
	138	linecopy = line.strip().lower()
[1901]	139	for di in [d.lower() for d in directives] :
	140	if linecopy.startswith("%s " % di) :
	141	try :
	142	val = line.split()[1]
	143	except :
	144	pass # ignore errors, we take the last value in any case.
	145	else :
	146	dirvalues[di] = val
[1502]	147	conffile.close()
[1901]	148	return dirvalues
[1502]	149
[2217]	150	def getJobInfosFromPageLog(self, cupsconfig, printername, username, jobid) :
	151	"""Retrieves the job-originating-hostname and job-billing attributes from the CUPS page_log file if possible."""
[1901]	152	pagelogpath = cupsconfig.get("pagelog", "/var/log/cups/page_log")
	153	self.logdebug("Trying to extract job-originating-host-name from %s" % pagelogpath)
[1502]	154	try :
	155	pagelog = open(pagelogpath, "r")
	156	except IOError :
[1503]	157	self.logdebug("Unable to open %s" % pagelogpath)
[2217]	158	return (None, None) # no page log or can't read it, originating hostname unknown yet
[1502]	159	else :
	160	# TODO : read backward so we could take first value seen
	161	# TODO : here we read forward so we must take the last value seen
[1819]	162	prefix = ("%s %s %s " % (printername, username, jobid)).lower()
[1502]	163	matchingline = None
	164	while 1 :
	165	line = pagelog.readline()
	166	if not line :
	167	break
	168	else :
	169	line = line.strip()
[1530]	170	if line.lower().startswith(prefix) :
[1502]	171	matchingline = line # no break, because we read forward
	172	pagelog.close()
	173	if matchingline is None :
[1606]	174	self.logdebug("No matching line found in %s" % pagelogpath)
[2217]	175	return (None, None) # correct line not found, job-originating-host-name unknown
[1502]	176	else :
[2217]	177	(jobbilling, hostname) = matchingline.split()[-2:]
	178	if jobbilling == "-" :
	179	jobbilling = ""
	180	return (jobbilling, hostname)
[1502]	181
[1271]	182	def doWork(self, policy, printer, user, userpquota) :
	183	"""Most of the work is done here."""
	184	# Two different values possible for policy here :
	185	# ALLOW means : Either printer, user or user print quota doesn't exist,
	186	# but the job should be allowed anyway.
	187	# OK means : Both printer, user and user print quota exist, job should
	188	# be allowed if current user is allowed to print on this printer
	189	if policy == "OK" :
[1372]	190	# exports user information with initial values
	191	self.exportUserInfo(userpquota)
	192
[1901]	193	# tries to extract job-originating-host-name and other information
[2177]	194	self.regainPriv()
[1901]	195	cupsdconf = self.getCupsConfigDirectives(["PageLog", "RequestRoot"])
	196	requestroot = cupsdconf.get("requestroot", "/var/spool/cups")
	197	if (len(self.jobid) < 5) and self.jobid.isdigit() :
	198	ippmessagefile = "c%05i" % int(self.jobid)
	199	else :
	200	ippmessagefile = "c%s" % self.jobid
	201	ippmessagefile = os.path.join(requestroot, ippmessagefile)
	202	ippmessage = {}
	203	try :
	204	ippdatafile = open(ippmessagefile)
	205	except :
	206	self.printInfo("Unable to open IPP message file %s" % ippmessagefile, "warn")
	207	else :
	208	self.logdebug("Parsing of IPP message file %s begins." % ippmessagefile)
[1902]	209	try :
	210	ippmessage = IPPMessage(ippdatafile.read())
	211	except PyKotaIPPError, msg :
	212	self.printInfo("Error while parsing %s : %s" % (ippmessagefile, msg), "warn")
	213	else :
	214	self.logdebug("Parsing of IPP message file %s ends." % ippmessagefile)
[1901]	215	ippdatafile.close()
[2007]	216	self.dropPriv()
[2254]	217
	218	try :
	219	(chtype, clienthost) = ippmessage.operation_attributes.get("job-originating-host-name", \
	220	ippmessage.job_attributes.get("job-originating-host-name", (None, None)))
	221	(jbtype, billingcode) = ippmessage.job_attributes.get("job-billing", (None, None))
	222	except AttributeError :
	223	clienthost = None
	224	billingcode = None
[2217]	225	if clienthost is None :
	226	(billingcode, clienthost) = self.getJobInfosFromPageLog(cupsdconf, printer.Name, user.Name, self.jobid)
[1503]	227	self.logdebug("Client Hostname : %s" % (clienthost or "Unknown"))
[2217]	228	self.logdebug("Billing Code : %s" % (billingcode or "None"))
[2254]	229
[2239]	230	os.environ["PYKOTAJOBORIGINATINGHOSTNAME"] = str(clienthost or "")
	231	os.environ["PYKOTAJOBBILLING"] = str(billingcode or "")
[1502]	232
[1375]	233	# enters first phase
[1517]	234	os.environ["PYKOTAPHASE"] = "BEFORE"
[1375]	235
[2060]	236	# precomputes the job's price
	237	self.softwareJobPrice = userpquota.computeJobPrice(self.softwareJobSize)
[1517]	238	os.environ["PYKOTAPRECOMPUTEDJOBPRICE"] = str(self.softwareJobPrice)
[2060]	239	self.logdebug("Precomputed job's size is %s pages, price is %s units" % (self.softwareJobSize, self.softwareJobPrice))
[1519]	240
[2308]	241	denyduplicates = self.config.getDenyDuplicates(printer.Name)
[1519]	242	if not self.jobSizeBytes :
[2066]	243	# if no data to pass to real backend, probably a filter
	244	# higher in the chain failed because of a misconfiguration.
	245	# we deny the job in this case (nothing to print anyway)
[1820]	246	self.printMoreInfo(user, printer, _("Job contains no data. Printing is denied."), "warn")
[1519]	247	action = "DENY"
[2308]	248	elif denyduplicates \
[2066]	249	and printer.LastJob.Exists \
	250	and (printer.LastJob.UserName == user.Name) \
	251	and (printer.LastJob.JobMD5Sum == self.checksum) :
[2308]	252	if denyduplicates == 1 :
	253	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied."), "warn")
	254	action = "DENY"
	255	else :
	256	self.logdebug("Launching subprocess [%s] to see if dupes should be allowed or not." % denyduplicates)
	257	fanswer = os.popen(denyduplicates, "r")
	258	action = fanswer.read().strip().upper()
	259	fanswer.close()
	260	if action == "DENY" :
	261	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied by subprocess."), "warn")
	262	else :
	263	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is allowed by subprocess."), "warn")
	264	action = "ALLOW" # just to be sure, in the case the external command returns something else...
[1606]	265	else :
	266	# checks the user's quota
	267	action = self.warnUserPQuota(userpquota)
[1519]	268
[1372]	269	# exports some new environment variables
[1517]	270	os.environ["PYKOTAACTION"] = action
[1372]	271
	272	# launches the pre hook
	273	self.prehook(userpquota)
[1918]	274
	275	# saves the size of banners which have to be accounted for
	276	# this is needed in the case of software accounting
	277	bannersize = 0
[1372]	278
[1918]	279	# handle starting banner pages before accounting
	280	accountbanner = self.config.getAccountBanner(printer.Name)
	281	if accountbanner in ["ENDING", "NONE"] :
[2066]	282	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	283	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	284	else :
	285	if action == 'DENY' :
[2066]	286	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	287	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	288	self.exportUserInfo(userpquota)
	289	banner = self.startingBanner(printer.Name)
	290	if banner :
	291	self.logdebug("Printing starting banner before accounting begins.")
	292	self.handleData(banner)
[1918]	293
[1820]	294	self.printMoreInfo(user, printer, _("Job accounting begins."))
[1624]	295	self.accounter.beginJob(printer)
[1918]	296
	297	# handle starting banner pages during accounting
	298	if accountbanner in ["STARTING", "BOTH"] :
[2066]	299	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	300	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	301	else :
	302	if action == 'DENY' :
[2066]	303	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	304	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	305	self.exportUserInfo(userpquota)
	306	banner = self.startingBanner(printer.Name)
	307	if banner :
	308	self.logdebug("Printing starting banner during accounting.")
	309	self.handleData(banner)
	310	if self.accounter.isSoftware :
	311	bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer
[1280]	312	else :
	313	action = "ALLOW"
[1517]	314	os.environ["PYKOTAACTION"] = action
[1271]	315
	316	# pass the job's data to the real backend
[1280]	317	if action in ["ALLOW", "WARN"] :
[1291]	318	if self.gotSigTerm :
[1280]	319	retcode = self.removeJob()
	320	else :
	321	retcode = self.handleData()
	322	else :
[1271]	323	retcode = self.removeJob()
	324
	325	if policy == "OK" :
[1374]	326	# indicate phase change
[1517]	327	os.environ["PYKOTAPHASE"] = "AFTER"
[1374]	328
[1918]	329	# handle ending banner pages during accounting
	330	if accountbanner in ["ENDING", "BOTH"] :
[2066]	331	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	332	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	333	else :
	334	if action == 'DENY' :
[2066]	335	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	336	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	337	self.exportUserInfo(userpquota)
	338	banner = self.endingBanner(printer.Name)
	339	if banner :
	340	self.logdebug("Printing ending banner during accounting.")
	341	self.handleData(banner)
	342	if self.accounter.isSoftware :
	343	bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer
[1918]	344
[1271]	345	# stops accounting.
[1624]	346	self.accounter.endJob(printer)
[1820]	347	self.printMoreInfo(user, printer, _("Job accounting ends."))
[1271]	348
	349	# retrieve the job size
[1321]	350	if action == "DENY" :
	351	jobsize = 0
[1820]	352	self.printMoreInfo(user, printer, _("Job size forced to 0 because printing is denied."))
[1321]	353	else :
[2066]	354	userpquota.resetDenyBannerCounter()
[2007]	355	jobsize = self.accounter.getJobSize(printer)
[1974]	356	if self.softwareJobSize and (jobsize != self.softwareJobSize) :
	357	self.printInfo(_("Beware : computed job size (%s) != precomputed job size (%s)") % (jobsize, self.softwareJobSize), "error")
[2062]	358	(limit, replacement) = self.config.getTrustJobSize(printer.Name)
	359	if limit is None :
	360	self.printInfo(_("The job size will be trusted anyway according to the 'trustjobsize' directive"), "warn")
	361	else :
	362	if jobsize <= limit :
	363	self.printInfo(_("The job size will be trusted because it is inferior to the 'trustjobsize' directive's limit %s") % limit, "warn")
	364	else :
	365	self.printInfo(_("The job size will be modified according to the 'trustjobsize' directive : %s") % replacement, "warn")
	366	if replacement == "PRECOMPUTED" :
	367	jobsize = self.softwareJobSize
	368	else :
	369	jobsize = replacement
[2007]	370	jobsize += bannersize
[1820]	371	self.printMoreInfo(user, printer, _("Job size : %i") % jobsize)
[1271]	372
	373	# update the quota for the current user on this printer
[1606]	374	self.printInfo(_("Updating user %s's quota on printer %s") % (user.Name, printer.Name))
[1285]	375	jobprice = userpquota.increasePagesUsage(jobsize)
[1271]	376
	377	# adds the current job to history
[2057]	378	printer.addJobToHistory(self.jobid, user, self.accounter.getLastPageCounter(), \
	379	action, jobsize, jobprice, self.preserveinputfile, \
	380	self.title, self.copies, self.options, clienthost, \
[2217]	381	self.jobSizeBytes, self.checksum, None, billingcode)
[1820]	382	self.printMoreInfo(user, printer, _("Job added to history."))
[1271]	383
[1372]	384	# exports some new environment variables
[1517]	385	os.environ["PYKOTAJOBSIZE"] = str(jobsize)
	386	os.environ["PYKOTAJOBPRICE"] = str(jobprice)
[1372]	387
[1517]	388	# then re-export user information with new value
[1372]	389	self.exportUserInfo(userpquota)
	390
[1923]	391	# handle ending banner pages after accounting ends
	392	if accountbanner in ["STARTING", "NONE"] :
[2066]	393	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	394	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	395	else :
	396	if action == 'DENY' :
[2066]	397	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	398	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	399	self.exportUserInfo(userpquota)
	400	banner = self.endingBanner(printer.Name)
	401	if banner :
	402	self.logdebug("Printing ending banner after accounting ends.")
	403	self.handleData(banner)
	404
[1372]	405	# Launches the post hook
	406	self.posthook(userpquota)
	407
[1271]	408	return retcode
[1478]	409
[1458]	410	def unregisterFileNo(self, pollobj, fileno) :
	411	"""Removes a file handle from the polling object."""
	412	try :
	413	pollobj.unregister(fileno)
	414	except KeyError :
[1584]	415	self.printInfo(_("File number %s unregistered twice from polling object, ignored.") % fileno, "warn")
[1494]	416	except :
	417	self.logdebug("Error while unregistering file number %s from polling object." % fileno)
[1458]	418	else :
	419	self.logdebug("File number %s unregistered from polling object." % fileno)
	420
[1495]	421	def formatFileEvent(self, fd, mask) :
[1478]	422	"""Formats file debug info."""
[1495]	423	maskval = []
	424	if mask & select.POLLIN :
	425	maskval.append("POLLIN")
	426	if mask & select.POLLOUT :
	427	maskval.append("POLLOUT")
	428	if mask & select.POLLPRI :
	429	maskval.append("POLLPRI")
	430	if mask & select.POLLERR :
	431	maskval.append("POLLERR")
	432	if mask & select.POLLHUP :
	433	maskval.append("POLLHUP")
	434	if mask & select.POLLNVAL :
	435	maskval.append("POLLNVAL")
	436	return "%s (%s)" % (fd, " \| ".join(maskval))
[1478]	437
[1918]	438	def handleData(self, filehandle=None) :
[1271]	439	"""Pass the job's data to the real backend."""
[1222]	440	# Find the real backend pathname
[1271]	441	realbackend = os.path.join(os.path.split(sys.argv[0])[0], self.originalbackend)
[1222]	442
	443	# And launch it
[1923]	444	if filehandle is None :
	445	arguments = sys.argv
	446	else :
	447	# Here we absolutely WANT to remove any filename from the command line !
	448	arguments = [ "Fake this because we are printing a banner" ] + sys.argv[1:6]
[2006]	449
	450	self.regainPriv()
	451
[1924]	452	self.logdebug("Starting real backend %s with args %s" % (realbackend, " ".join(['"%s"' % a for a in ([os.environ["DEVICE_URI"]] + arguments[1:])])))
	453	subprocess = PyKotaPopen4([realbackend] + arguments[1:], bufsize=0, arg0=os.environ["DEVICE_URI"])
[1222]	454
	455	# Save file descriptors, we will need them later.
	456	stderrfno = sys.stderr.fileno()
	457	fromcfno = subprocess.fromchild.fileno()
[1494]	458	tocfno = subprocess.tochild.fileno()
[1222]	459
	460	# We will have to be careful when dealing with I/O
	461	# So we use a poll object to know when to read or write
	462	pollster = select.poll()
	463	pollster.register(fromcfno, select.POLLIN \| select.POLLPRI)
[1494]	464	pollster.register(stderrfno, select.POLLOUT)
	465	pollster.register(tocfno, select.POLLOUT)
[1222]	466
[1494]	467	# Initialize our buffers
	468	indata = ""
	469	outdata = ""
	470	endinput = endoutput = 0
	471	inputclosed = outputclosed = 0
[1897]	472	totaltochild = totalfromcups = 0
	473	totalfromchild = totaltocups = 0
[1494]	474
[1918]	475	if filehandle is None:
	476	if self.preserveinputfile is None :
	477	# this is not a real file, we read the job's data
	478	# from our temporary file which is a copy of stdin
	479	infno = self.jobdatastream.fileno()
	480	self.jobdatastream.seek(0)
	481	pollster.register(infno, select.POLLIN \| select.POLLPRI)
	482	else :
	483	# job's data is in a file, no need to pass the data
	484	# to the real backend
	485	self.logdebug("Job's data is in %s" % self.preserveinputfile)
	486	infno = None
	487	endinput = 1
	488	else:
	489	self.logdebug("Printing data passed from filehandle")
	490	indata = filehandle.read()
[1494]	491	infno = None
	492	endinput = 1
[1918]	493	filehandle.close()
[1494]	494
[1606]	495	self.logdebug("Entering streams polling loop...")
[1495]	496	MEGABYTE = 1024*1024
[1494]	497	killed = 0
	498	status = -1
[1495]	499	while (status == -1) and (not killed) and not (inputclosed and outputclosed) :
[1494]	500	# First check if original backend is still alive
	501	status = subprocess.poll()
	502
	503	# Now if we got SIGTERM, we have
	504	# to kill -TERM the original backend
	505	if self.gotSigTerm and not killed :
	506	try :
[1222]	507	os.kill(subprocess.pid, signal.SIGTERM)
[1495]	508	except OSError, msg : # ignore but logs if process was already killed.
[1514]	509	self.logdebug("Error while sending signal to pid %s : %s" % (subprocess.pid, msg))
[1495]	510	else :
[1606]	511	self.printInfo(_("SIGTERM was sent to real backend %s (pid: %s)") % (realbackend, subprocess.pid))
[1291]	512	killed = 1
[1494]	513
	514	# In any case, deal with any remaining I/O
[1498]	515	try :
	516	availablefds = pollster.poll(5000)
	517	except select.error, msg :
	518	self.logdebug("Interrupted poll : %s" % msg)
	519	availablefds = []
[1495]	520	if not availablefds :
[1606]	521	self.logdebug("Nothing to do, sleeping a bit...")
[1495]	522	time.sleep(0.01) # give some time to the system
	523	else :
	524	for (fd, mask) in availablefds :
	525	# self.logdebug(self.formatFileEvent(fd, mask))
	526	try :
	527	if mask & select.POLLOUT :
	528	# We can write
	529	if fd == tocfno :
	530	if indata :
	531	try :
[1897]	532	nbwritten = os.write(fd, indata)
[1515]	533	except (OSError, IOError), msg :
[1495]	534	self.logdebug("Error while writing to real backend's stdin %s : %s" % (fd, msg))
	535	else :
[1897]	536	if len(indata) != nbwritten :
	537	self.logdebug("Short write to real backend's input !")
	538	totaltochild += nbwritten
	539	self.logdebug("%s bytes sent to real backend so far..." % totaltochild)
	540	indata = indata[nbwritten:]
[1498]	541	else :
[1606]	542	self.logdebug("No data to send to real backend yet, sleeping a bit...")
[1498]	543	time.sleep(0.01)
	544
[1495]	545	if endinput :
	546	self.unregisterFileNo(pollster, tocfno)
[1606]	547	self.logdebug("Closing real backend's stdin.")
[1495]	548	os.close(tocfno)
	549	inputclosed = 1
	550	elif fd == stderrfno :
	551	if outdata :
	552	try :
[1897]	553	nbwritten = os.write(fd, outdata)
[1515]	554	except (OSError, IOError), msg :
[1495]	555	self.logdebug("Error while writing to CUPS back channel (stderr) %s : %s" % (fd, msg))
	556	else :
[1897]	557	if len(outdata) != nbwritten :
	558	self.logdebug("Short write to stderr (CUPS) !")
	559	totaltocups += nbwritten
	560	self.logdebug("%s bytes sent back to CUPS so far..." % totaltocups)
	561	outdata = outdata[nbwritten:]
[1498]	562	else :
	563	# self.logdebug("No data to send back to CUPS yet, sleeping a bit...") # Uncommenting this fills your logs
	564	time.sleep(0.01) # Give some time to the system, stderr is ALWAYS writeable it seems.
	565
[1495]	566	if endoutput :
	567	self.unregisterFileNo(pollster, stderrfno)
	568	outputclosed = 1
[1498]	569	else :
	570	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	571	time.sleep(0.01)
	572
[1495]	573	if mask & (select.POLLIN \| select.POLLPRI) :
	574	# We have something to read
	575	try :
	576	data = os.read(fd, MEGABYTE)
	577	except (IOError, OSError), msg :
	578	self.logdebug("Error while reading file %s : %s" % (fd, msg))
	579	else :
	580	if fd == infno :
	581	if not data : # If yes, then no more input data
	582	self.unregisterFileNo(pollster, infno)
[1606]	583	self.logdebug("Input data ends.")
[1495]	584	endinput = 1 # this happens with real files.
[1498]	585	else :
	586	indata += data
[1897]	587	totalfromcups += len(data)
	588	self.logdebug("%s bytes read from CUPS so far..." % totalfromcups)
[1495]	589	elif fd == fromcfno :
[1498]	590	if not data :
[1606]	591	self.logdebug("No back channel data to read from real backend yet, sleeping a bit...")
[1498]	592	time.sleep(0.01)
	593	else :
	594	outdata += data
[1897]	595	totalfromchild += len(data)
	596	self.logdebug("%s bytes read from real backend so far..." % totalfromchild)
[1498]	597	else :
	598	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	599	time.sleep(0.01)
	600
[1495]	601	if mask & (select.POLLHUP \| select.POLLERR) :
	602	# Treat POLLERR as an EOF.
	603	# Some standard I/O stream has no more datas
	604	self.unregisterFileNo(pollster, fd)
[1494]	605	if fd == infno :
[1495]	606	# Here we are in the case where the input file is stdin.
	607	# which has no more data to be read.
[1606]	608	self.logdebug("Input data ends.")
[1495]	609	endinput = 1
	610	elif fd == fromcfno :
	611	# We are no more interested in this file descriptor
[1606]	612	self.logdebug("Closing real backend's stdout+stderr.")
[1495]	613	os.close(fromcfno)
	614	endoutput = 1
[1498]	615	else :
	616	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	617	time.sleep(0.01)
[1495]	618
	619	if mask & select.POLLNVAL :
[1606]	620	self.logdebug("File %s was closed. Unregistering from polling object." % fd)
[1495]	621	self.unregisterFileNo(pollster, fd)
	622	except IOError, msg :
	623	self.logdebug("Got an IOError : %s" % msg) # we got signalled during an I/O
[1191]	624
[1494]	625	# We must close the real backend's input stream
	626	if killed and not inputclosed :
[1606]	627	self.logdebug("Forcing close of real backend's stdin.")
[1494]	628	os.close(tocfno)
	629
[1606]	630	self.logdebug("Exiting streams polling loop...")
[1492]	631
[1897]	632	self.logdebug("input data's final length : %s" % len(indata))
	633	self.logdebug("back-channel data's final length : %s" % len(outdata))
	634
	635	self.logdebug("Total bytes read from CUPS (job's datas) : %s" % totalfromcups)
	636	self.logdebug("Total bytes sent to real backend (job's datas) : %s" % totaltochild)
	637
	638	self.logdebug("Total bytes read from real backend (back-channel datas) : %s" % totalfromchild)
	639	self.logdebug("Total bytes sent back to CUPS (back-channel datas) : %s" % totaltocups)
	640
[1494]	641	# Check exit code of original CUPS backend.
	642	if status == -1 :
	643	# we exited the loop before the real backend exited
	644	# now we have to wait for it to finish and get its status
[1606]	645	self.logdebug("Waiting for real backend to exit...")
[1494]	646	try :
	647	status = subprocess.wait()
[2054]	648	except OSError : # already dead : TODO : detect when abnormal
[1494]	649	status = 0
[1222]	650	if os.WIFEXITED(status) :
	651	retcode = os.WEXITSTATUS(status)
[1291]	652	elif not killed :
[1606]	653	self.sendBackChannelData(_("CUPS backend %s died abnormally.") % realbackend, "error")
[1222]	654	retcode = -1
[1291]	655	else :
	656	retcode = self.removeJob()
[2006]	657
	658	self.dropPriv()
	659
[1271]	660	return retcode
[1222]	661
[1177]	662	if __name__ == "__main__" :
	663	# This is a CUPS backend, we should act and die like a CUPS backend
[1542]	664	retcode = 0
[1177]	665	if len(sys.argv) == 1 :
[1178]	666	(directory, myname) = os.path.split(sys.argv[0])
[2164]	667	tmpdir = tempfile.gettempdir()
	668	lockfilename = os.path.join(tmpdir, "%s..LCK" % myname)
	669	if os.path.exists(lockfilename) :
	670	# there's already a lockfile, see if still used
	671	lockfile = open(lockfilename, "r")
	672	pid = int(lockfile.read())
	673	lockfile.close()
[1178]	674	try :
[2164]	675	# see if the pid contained in the lock file is still running
	676	os.kill(pid, 0)
	677	except OSError, e :
	678	if e.errno != errno.EPERM :
	679	# process doesn't exist anymore, remove the lock
	680	os.remove(lockfilename)
	681
	682	if not os.path.exists(lockfilename) :
	683	lockfile = open(lockfilename, "w")
	684	lockfile.write("%i" % os.getpid())
	685	lockfile.close()
	686	# we will execute each existing backend in device enumeration mode
	687	# and generate their PyKota accounting counterpart
[2165]	688	allbackends = [ os.path.join(directory, b) \
	689	for b in os.listdir(directory)
	690	if os.access(os.path.join(directory, b), os.X_OK) \
	691	and (b != myname)]
	692	for backend in allbackends :
[2164]	693	answer = os.popen(backend, "r")
	694	try :
	695	devices = [line.strip() for line in answer.readlines()]
	696	except :
	697	devices = []
	698	status = answer.close()
	699	if status is None :
	700	for d in devices :
	701	# each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"'
	702	# so we have to decompose it carefully
	703	fdevice = cStringIO.StringIO("%s" % d)
	704	tokenizer = shlex.shlex(fdevice)
	705	tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#"
	706	arguments = []
	707	while 1 :
	708	token = tokenizer.get_token()
	709	if token :
	710	arguments.append(token)
	711	else :
	712	break
	713	fdevice.close()
	714	try :
	715	(devicetype, device, name, fullname) = arguments
	716	except ValueError :
	717	pass # ignore this 'bizarre' device
	718	else :
	719	if name.startswith('"') and name.endswith('"') :
	720	name = name[1:-1]
	721	if fullname.startswith('"') and fullname.endswith('"') :
	722	fullname = fullname[1:-1]
	723	print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname)
	724	os.remove(lockfilename)
[1542]	725	retcode = 0
[1177]	726	elif len(sys.argv) not in (6, 7) :
	727	sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0])
	728	retcode = 1
	729	else :
	730	try :
[2210]	731	# Initializes the backend
	732	kotabackend = PyKotaBackend()
	733	kotabackend.deferredInit()
	734	retcode = kotabackend.mainWork()
	735	kotabackend.storage.close()
	736	kotabackend.closeJobDataStream()
	737	except SystemExit :
	738	retcode = -1
[1513]	739	except :
[1517]	740	try :
	741	kotabackend.crashed("cupspykota backend failed")
	742	except :
[1542]	743	crashed("cupspykota backend failed")
	744	retcode = 1
[1177]	745
	746	sys.exit(retcode)

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