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cupspykota @ 2314

Revision 2314, 37.5 kB (checked in by jerome, 19 years ago)
Added a comment about dupes. Severity : improvement to do when all the rest is done :-)
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
[2313]	42	from pykota.ipp import IPPRequest, 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 :
[2313]	210	ippmessage = IPPRequest(ippdatafile.read())
[2311]	211	ippmessage.parse()
	212	except IPPError, msg :
[1902]	213	self.printInfo("Error while parsing %s : %s" % (ippmessagefile, msg), "warn")
	214	else :
	215	self.logdebug("Parsing of IPP message file %s ends." % ippmessagefile)
[1901]	216	ippdatafile.close()
[2007]	217	self.dropPriv()
[2254]	218
	219	try :
	220	(chtype, clienthost) = ippmessage.operation_attributes.get("job-originating-host-name", \
	221	ippmessage.job_attributes.get("job-originating-host-name", (None, None)))
	222	(jbtype, billingcode) = ippmessage.job_attributes.get("job-billing", (None, None))
	223	except AttributeError :
	224	clienthost = None
	225	billingcode = None
[2217]	226	if clienthost is None :
	227	(billingcode, clienthost) = self.getJobInfosFromPageLog(cupsdconf, printer.Name, user.Name, self.jobid)
[1503]	228	self.logdebug("Client Hostname : %s" % (clienthost or "Unknown"))
[2217]	229	self.logdebug("Billing Code : %s" % (billingcode or "None"))
[2254]	230
[2239]	231	os.environ["PYKOTAJOBORIGINATINGHOSTNAME"] = str(clienthost or "")
	232	os.environ["PYKOTAJOBBILLING"] = str(billingcode or "")
[1502]	233
[1375]	234	# enters first phase
[1517]	235	os.environ["PYKOTAPHASE"] = "BEFORE"
[1375]	236
[2060]	237	# precomputes the job's price
	238	self.softwareJobPrice = userpquota.computeJobPrice(self.softwareJobSize)
[1517]	239	os.environ["PYKOTAPRECOMPUTEDJOBPRICE"] = str(self.softwareJobPrice)
[2060]	240	self.logdebug("Precomputed job's size is %s pages, price is %s units" % (self.softwareJobSize, self.softwareJobPrice))
[1519]	241
[2308]	242	denyduplicates = self.config.getDenyDuplicates(printer.Name)
[1519]	243	if not self.jobSizeBytes :
[2066]	244	# if no data to pass to real backend, probably a filter
	245	# higher in the chain failed because of a misconfiguration.
	246	# we deny the job in this case (nothing to print anyway)
[1820]	247	self.printMoreInfo(user, printer, _("Job contains no data. Printing is denied."), "warn")
[1519]	248	action = "DENY"
[2308]	249	elif denyduplicates \
[2066]	250	and printer.LastJob.Exists \
	251	and (printer.LastJob.UserName == user.Name) \
	252	and (printer.LastJob.JobMD5Sum == self.checksum) :
[2314]	253	# TODO : use the current user's last job instead of
	254	# TODO : the current printer's last job. This would be
	255	# TODO : better but requires an additional database query
	256	# TODO : with SQL, and is much more complex with the
	257	# TODO : actual LDAP schema. Maybe this is not very
	258	# TODO : important, because usually dupes are rapidly sucessive.
[2308]	259	if denyduplicates == 1 :
	260	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied."), "warn")
	261	action = "DENY"
	262	else :
	263	self.logdebug("Launching subprocess [%s] to see if dupes should be allowed or not." % denyduplicates)
	264	fanswer = os.popen(denyduplicates, "r")
	265	action = fanswer.read().strip().upper()
	266	fanswer.close()
	267	if action == "DENY" :
	268	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is denied by subprocess."), "warn")
	269	else :
	270	self.printMoreInfo(user, printer, _("Job is a duplicate. Printing is allowed by subprocess."), "warn")
	271	action = "ALLOW" # just to be sure, in the case the external command returns something else...
[1606]	272	else :
	273	# checks the user's quota
	274	action = self.warnUserPQuota(userpquota)
[1519]	275
[1372]	276	# exports some new environment variables
[1517]	277	os.environ["PYKOTAACTION"] = action
[1372]	278
	279	# launches the pre hook
	280	self.prehook(userpquota)
[1918]	281
	282	# saves the size of banners which have to be accounted for
	283	# this is needed in the case of software accounting
	284	bannersize = 0
[1372]	285
[1918]	286	# handle starting banner pages before accounting
	287	accountbanner = self.config.getAccountBanner(printer.Name)
	288	if accountbanner in ["ENDING", "NONE"] :
[2066]	289	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	290	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	291	else :
	292	if action == 'DENY' :
[2066]	293	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	294	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	295	self.exportUserInfo(userpquota)
	296	banner = self.startingBanner(printer.Name)
	297	if banner :
	298	self.logdebug("Printing starting banner before accounting begins.")
	299	self.handleData(banner)
[1918]	300
[1820]	301	self.printMoreInfo(user, printer, _("Job accounting begins."))
[1624]	302	self.accounter.beginJob(printer)
[1918]	303
	304	# handle starting banner pages during accounting
	305	if accountbanner in ["STARTING", "BOTH"] :
[2066]	306	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	307	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	308	else :
	309	if action == 'DENY' :
[2066]	310	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	311	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	312	self.exportUserInfo(userpquota)
	313	banner = self.startingBanner(printer.Name)
	314	if banner :
	315	self.logdebug("Printing starting banner during accounting.")
	316	self.handleData(banner)
	317	if self.accounter.isSoftware :
	318	bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer
[1280]	319	else :
	320	action = "ALLOW"
[1517]	321	os.environ["PYKOTAACTION"] = action
[1271]	322
	323	# pass the job's data to the real backend
[1280]	324	if action in ["ALLOW", "WARN"] :
[1291]	325	if self.gotSigTerm :
[1280]	326	retcode = self.removeJob()
	327	else :
	328	retcode = self.handleData()
	329	else :
[1271]	330	retcode = self.removeJob()
	331
	332	if policy == "OK" :
[1374]	333	# indicate phase change
[1517]	334	os.environ["PYKOTAPHASE"] = "AFTER"
[1374]	335
[1918]	336	# handle ending banner pages during accounting
	337	if accountbanner in ["ENDING", "BOTH"] :
[2066]	338	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	339	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	340	else :
	341	if action == 'DENY' :
[2066]	342	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	343	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	344	self.exportUserInfo(userpquota)
	345	banner = self.endingBanner(printer.Name)
	346	if banner :
	347	self.logdebug("Printing ending banner during accounting.")
	348	self.handleData(banner)
	349	if self.accounter.isSoftware :
	350	bannersize += 1 # TODO : fix this by passing the banner's content through PDLAnalyzer
[1918]	351
[1271]	352	# stops accounting.
[1624]	353	self.accounter.endJob(printer)
[1820]	354	self.printMoreInfo(user, printer, _("Job accounting ends."))
[1271]	355
	356	# retrieve the job size
[1321]	357	if action == "DENY" :
	358	jobsize = 0
[1820]	359	self.printMoreInfo(user, printer, _("Job size forced to 0 because printing is denied."))
[1321]	360	else :
[2066]	361	userpquota.resetDenyBannerCounter()
[2007]	362	jobsize = self.accounter.getJobSize(printer)
[1974]	363	if self.softwareJobSize and (jobsize != self.softwareJobSize) :
	364	self.printInfo(_("Beware : computed job size (%s) != precomputed job size (%s)") % (jobsize, self.softwareJobSize), "error")
[2062]	365	(limit, replacement) = self.config.getTrustJobSize(printer.Name)
	366	if limit is None :
	367	self.printInfo(_("The job size will be trusted anyway according to the 'trustjobsize' directive"), "warn")
	368	else :
	369	if jobsize <= limit :
	370	self.printInfo(_("The job size will be trusted because it is inferior to the 'trustjobsize' directive's limit %s") % limit, "warn")
	371	else :
	372	self.printInfo(_("The job size will be modified according to the 'trustjobsize' directive : %s") % replacement, "warn")
	373	if replacement == "PRECOMPUTED" :
	374	jobsize = self.softwareJobSize
	375	else :
	376	jobsize = replacement
[2007]	377	jobsize += bannersize
[1820]	378	self.printMoreInfo(user, printer, _("Job size : %i") % jobsize)
[1271]	379
	380	# update the quota for the current user on this printer
[1606]	381	self.printInfo(_("Updating user %s's quota on printer %s") % (user.Name, printer.Name))
[1285]	382	jobprice = userpquota.increasePagesUsage(jobsize)
[1271]	383
	384	# adds the current job to history
[2057]	385	printer.addJobToHistory(self.jobid, user, self.accounter.getLastPageCounter(), \
	386	action, jobsize, jobprice, self.preserveinputfile, \
	387	self.title, self.copies, self.options, clienthost, \
[2217]	388	self.jobSizeBytes, self.checksum, None, billingcode)
[1820]	389	self.printMoreInfo(user, printer, _("Job added to history."))
[1271]	390
[1372]	391	# exports some new environment variables
[1517]	392	os.environ["PYKOTAJOBSIZE"] = str(jobsize)
	393	os.environ["PYKOTAJOBPRICE"] = str(jobprice)
[1372]	394
[1517]	395	# then re-export user information with new value
[1372]	396	self.exportUserInfo(userpquota)
	397
[1923]	398	# handle ending banner pages after accounting ends
	399	if accountbanner in ["STARTING", "NONE"] :
[2066]	400	if (action == 'DENY') and (userpquota.WarnCount >= self.config.getMaxDenyBanners(printer.Name)) :
[2054]	401	self.printInfo(_("Banner won't be printed : maximum number of deny banners reached."), "warn")
	402	else :
	403	if action == 'DENY' :
[2066]	404	self.logdebug("Incrementing the number of deny banners for user %s on printer %s" % (user.Name, printer.Name))
	405	userpquota.incDenyBannerCounter() # increments the warning counter
[2054]	406	self.exportUserInfo(userpquota)
	407	banner = self.endingBanner(printer.Name)
	408	if banner :
	409	self.logdebug("Printing ending banner after accounting ends.")
	410	self.handleData(banner)
	411
[1372]	412	# Launches the post hook
	413	self.posthook(userpquota)
	414
[1271]	415	return retcode
[1478]	416
[1458]	417	def unregisterFileNo(self, pollobj, fileno) :
	418	"""Removes a file handle from the polling object."""
	419	try :
	420	pollobj.unregister(fileno)
	421	except KeyError :
[1584]	422	self.printInfo(_("File number %s unregistered twice from polling object, ignored.") % fileno, "warn")
[1494]	423	except :
	424	self.logdebug("Error while unregistering file number %s from polling object." % fileno)
[1458]	425	else :
	426	self.logdebug("File number %s unregistered from polling object." % fileno)
	427
[1495]	428	def formatFileEvent(self, fd, mask) :
[1478]	429	"""Formats file debug info."""
[1495]	430	maskval = []
	431	if mask & select.POLLIN :
	432	maskval.append("POLLIN")
	433	if mask & select.POLLOUT :
	434	maskval.append("POLLOUT")
	435	if mask & select.POLLPRI :
	436	maskval.append("POLLPRI")
	437	if mask & select.POLLERR :
	438	maskval.append("POLLERR")
	439	if mask & select.POLLHUP :
	440	maskval.append("POLLHUP")
	441	if mask & select.POLLNVAL :
	442	maskval.append("POLLNVAL")
	443	return "%s (%s)" % (fd, " \| ".join(maskval))
[1478]	444
[1918]	445	def handleData(self, filehandle=None) :
[1271]	446	"""Pass the job's data to the real backend."""
[1222]	447	# Find the real backend pathname
[1271]	448	realbackend = os.path.join(os.path.split(sys.argv[0])[0], self.originalbackend)
[1222]	449
	450	# And launch it
[1923]	451	if filehandle is None :
	452	arguments = sys.argv
	453	else :
	454	# Here we absolutely WANT to remove any filename from the command line !
	455	arguments = [ "Fake this because we are printing a banner" ] + sys.argv[1:6]
[2006]	456
	457	self.regainPriv()
	458
[1924]	459	self.logdebug("Starting real backend %s with args %s" % (realbackend, " ".join(['"%s"' % a for a in ([os.environ["DEVICE_URI"]] + arguments[1:])])))
	460	subprocess = PyKotaPopen4([realbackend] + arguments[1:], bufsize=0, arg0=os.environ["DEVICE_URI"])
[1222]	461
	462	# Save file descriptors, we will need them later.
	463	stderrfno = sys.stderr.fileno()
	464	fromcfno = subprocess.fromchild.fileno()
[1494]	465	tocfno = subprocess.tochild.fileno()
[1222]	466
	467	# We will have to be careful when dealing with I/O
	468	# So we use a poll object to know when to read or write
	469	pollster = select.poll()
	470	pollster.register(fromcfno, select.POLLIN \| select.POLLPRI)
[1494]	471	pollster.register(stderrfno, select.POLLOUT)
	472	pollster.register(tocfno, select.POLLOUT)
[1222]	473
[1494]	474	# Initialize our buffers
	475	indata = ""
	476	outdata = ""
	477	endinput = endoutput = 0
	478	inputclosed = outputclosed = 0
[1897]	479	totaltochild = totalfromcups = 0
	480	totalfromchild = totaltocups = 0
[1494]	481
[1918]	482	if filehandle is None:
	483	if self.preserveinputfile is None :
	484	# this is not a real file, we read the job's data
	485	# from our temporary file which is a copy of stdin
	486	infno = self.jobdatastream.fileno()
	487	self.jobdatastream.seek(0)
	488	pollster.register(infno, select.POLLIN \| select.POLLPRI)
	489	else :
	490	# job's data is in a file, no need to pass the data
	491	# to the real backend
	492	self.logdebug("Job's data is in %s" % self.preserveinputfile)
	493	infno = None
	494	endinput = 1
	495	else:
	496	self.logdebug("Printing data passed from filehandle")
	497	indata = filehandle.read()
[1494]	498	infno = None
	499	endinput = 1
[1918]	500	filehandle.close()
[1494]	501
[1606]	502	self.logdebug("Entering streams polling loop...")
[1495]	503	MEGABYTE = 1024*1024
[1494]	504	killed = 0
	505	status = -1
[1495]	506	while (status == -1) and (not killed) and not (inputclosed and outputclosed) :
[1494]	507	# First check if original backend is still alive
	508	status = subprocess.poll()
	509
	510	# Now if we got SIGTERM, we have
	511	# to kill -TERM the original backend
	512	if self.gotSigTerm and not killed :
	513	try :
[1222]	514	os.kill(subprocess.pid, signal.SIGTERM)
[1495]	515	except OSError, msg : # ignore but logs if process was already killed.
[1514]	516	self.logdebug("Error while sending signal to pid %s : %s" % (subprocess.pid, msg))
[1495]	517	else :
[1606]	518	self.printInfo(_("SIGTERM was sent to real backend %s (pid: %s)") % (realbackend, subprocess.pid))
[1291]	519	killed = 1
[1494]	520
	521	# In any case, deal with any remaining I/O
[1498]	522	try :
	523	availablefds = pollster.poll(5000)
	524	except select.error, msg :
	525	self.logdebug("Interrupted poll : %s" % msg)
	526	availablefds = []
[1495]	527	if not availablefds :
[1606]	528	self.logdebug("Nothing to do, sleeping a bit...")
[1495]	529	time.sleep(0.01) # give some time to the system
	530	else :
	531	for (fd, mask) in availablefds :
	532	# self.logdebug(self.formatFileEvent(fd, mask))
	533	try :
	534	if mask & select.POLLOUT :
	535	# We can write
	536	if fd == tocfno :
	537	if indata :
	538	try :
[1897]	539	nbwritten = os.write(fd, indata)
[1515]	540	except (OSError, IOError), msg :
[1495]	541	self.logdebug("Error while writing to real backend's stdin %s : %s" % (fd, msg))
	542	else :
[1897]	543	if len(indata) != nbwritten :
	544	self.logdebug("Short write to real backend's input !")
	545	totaltochild += nbwritten
	546	self.logdebug("%s bytes sent to real backend so far..." % totaltochild)
	547	indata = indata[nbwritten:]
[1498]	548	else :
[1606]	549	self.logdebug("No data to send to real backend yet, sleeping a bit...")
[1498]	550	time.sleep(0.01)
	551
[1495]	552	if endinput :
	553	self.unregisterFileNo(pollster, tocfno)
[1606]	554	self.logdebug("Closing real backend's stdin.")
[1495]	555	os.close(tocfno)
	556	inputclosed = 1
	557	elif fd == stderrfno :
	558	if outdata :
	559	try :
[1897]	560	nbwritten = os.write(fd, outdata)
[1515]	561	except (OSError, IOError), msg :
[1495]	562	self.logdebug("Error while writing to CUPS back channel (stderr) %s : %s" % (fd, msg))
	563	else :
[1897]	564	if len(outdata) != nbwritten :
	565	self.logdebug("Short write to stderr (CUPS) !")
	566	totaltocups += nbwritten
	567	self.logdebug("%s bytes sent back to CUPS so far..." % totaltocups)
	568	outdata = outdata[nbwritten:]
[1498]	569	else :
	570	# self.logdebug("No data to send back to CUPS yet, sleeping a bit...") # Uncommenting this fills your logs
	571	time.sleep(0.01) # Give some time to the system, stderr is ALWAYS writeable it seems.
	572
[1495]	573	if endoutput :
	574	self.unregisterFileNo(pollster, stderrfno)
	575	outputclosed = 1
[1498]	576	else :
	577	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	578	time.sleep(0.01)
	579
[1495]	580	if mask & (select.POLLIN \| select.POLLPRI) :
	581	# We have something to read
	582	try :
	583	data = os.read(fd, MEGABYTE)
	584	except (IOError, OSError), msg :
	585	self.logdebug("Error while reading file %s : %s" % (fd, msg))
	586	else :
	587	if fd == infno :
	588	if not data : # If yes, then no more input data
	589	self.unregisterFileNo(pollster, infno)
[1606]	590	self.logdebug("Input data ends.")
[1495]	591	endinput = 1 # this happens with real files.
[1498]	592	else :
	593	indata += data
[1897]	594	totalfromcups += len(data)
	595	self.logdebug("%s bytes read from CUPS so far..." % totalfromcups)
[1495]	596	elif fd == fromcfno :
[1498]	597	if not data :
[1606]	598	self.logdebug("No back channel data to read from real backend yet, sleeping a bit...")
[1498]	599	time.sleep(0.01)
	600	else :
	601	outdata += data
[1897]	602	totalfromchild += len(data)
	603	self.logdebug("%s bytes read from real backend so far..." % totalfromchild)
[1498]	604	else :
	605	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	606	time.sleep(0.01)
	607
[1495]	608	if mask & (select.POLLHUP \| select.POLLERR) :
	609	# Treat POLLERR as an EOF.
	610	# Some standard I/O stream has no more datas
	611	self.unregisterFileNo(pollster, fd)
[1494]	612	if fd == infno :
[1495]	613	# Here we are in the case where the input file is stdin.
	614	# which has no more data to be read.
[1606]	615	self.logdebug("Input data ends.")
[1495]	616	endinput = 1
	617	elif fd == fromcfno :
	618	# We are no more interested in this file descriptor
[1606]	619	self.logdebug("Closing real backend's stdout+stderr.")
[1495]	620	os.close(fromcfno)
	621	endoutput = 1
[1498]	622	else :
	623	self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask))
	624	time.sleep(0.01)
[1495]	625
	626	if mask & select.POLLNVAL :
[1606]	627	self.logdebug("File %s was closed. Unregistering from polling object." % fd)
[1495]	628	self.unregisterFileNo(pollster, fd)
	629	except IOError, msg :
	630	self.logdebug("Got an IOError : %s" % msg) # we got signalled during an I/O
[1191]	631
[1494]	632	# We must close the real backend's input stream
	633	if killed and not inputclosed :
[1606]	634	self.logdebug("Forcing close of real backend's stdin.")
[1494]	635	os.close(tocfno)
	636
[1606]	637	self.logdebug("Exiting streams polling loop...")
[1492]	638
[1897]	639	self.logdebug("input data's final length : %s" % len(indata))
	640	self.logdebug("back-channel data's final length : %s" % len(outdata))
	641
	642	self.logdebug("Total bytes read from CUPS (job's datas) : %s" % totalfromcups)
	643	self.logdebug("Total bytes sent to real backend (job's datas) : %s" % totaltochild)
	644
	645	self.logdebug("Total bytes read from real backend (back-channel datas) : %s" % totalfromchild)
	646	self.logdebug("Total bytes sent back to CUPS (back-channel datas) : %s" % totaltocups)
	647
[1494]	648	# Check exit code of original CUPS backend.
	649	if status == -1 :
	650	# we exited the loop before the real backend exited
	651	# now we have to wait for it to finish and get its status
[1606]	652	self.logdebug("Waiting for real backend to exit...")
[1494]	653	try :
	654	status = subprocess.wait()
[2054]	655	except OSError : # already dead : TODO : detect when abnormal
[1494]	656	status = 0
[1222]	657	if os.WIFEXITED(status) :
	658	retcode = os.WEXITSTATUS(status)
[1291]	659	elif not killed :
[1606]	660	self.sendBackChannelData(_("CUPS backend %s died abnormally.") % realbackend, "error")
[1222]	661	retcode = -1
[1291]	662	else :
	663	retcode = self.removeJob()
[2006]	664
	665	self.dropPriv()
	666
[1271]	667	return retcode
[1222]	668
[1177]	669	if __name__ == "__main__" :
	670	# This is a CUPS backend, we should act and die like a CUPS backend
[1542]	671	retcode = 0
[1177]	672	if len(sys.argv) == 1 :
[1178]	673	(directory, myname) = os.path.split(sys.argv[0])
[2164]	674	tmpdir = tempfile.gettempdir()
	675	lockfilename = os.path.join(tmpdir, "%s..LCK" % myname)
	676	if os.path.exists(lockfilename) :
	677	# there's already a lockfile, see if still used
	678	lockfile = open(lockfilename, "r")
	679	pid = int(lockfile.read())
	680	lockfile.close()
[1178]	681	try :
[2164]	682	# see if the pid contained in the lock file is still running
	683	os.kill(pid, 0)
	684	except OSError, e :
	685	if e.errno != errno.EPERM :
	686	# process doesn't exist anymore, remove the lock
	687	os.remove(lockfilename)
	688
	689	if not os.path.exists(lockfilename) :
	690	lockfile = open(lockfilename, "w")
	691	lockfile.write("%i" % os.getpid())
	692	lockfile.close()
	693	# we will execute each existing backend in device enumeration mode
	694	# and generate their PyKota accounting counterpart
[2165]	695	allbackends = [ os.path.join(directory, b) \
	696	for b in os.listdir(directory)
	697	if os.access(os.path.join(directory, b), os.X_OK) \
	698	and (b != myname)]
	699	for backend in allbackends :
[2164]	700	answer = os.popen(backend, "r")
	701	try :
	702	devices = [line.strip() for line in answer.readlines()]
	703	except :
	704	devices = []
	705	status = answer.close()
	706	if status is None :
	707	for d in devices :
	708	# each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"'
	709	# so we have to decompose it carefully
	710	fdevice = cStringIO.StringIO("%s" % d)
	711	tokenizer = shlex.shlex(fdevice)
	712	tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#"
	713	arguments = []
	714	while 1 :
	715	token = tokenizer.get_token()
	716	if token :
	717	arguments.append(token)
	718	else :
	719	break
	720	fdevice.close()
	721	try :
	722	(devicetype, device, name, fullname) = arguments
	723	except ValueError :
	724	pass # ignore this 'bizarre' device
	725	else :
	726	if name.startswith('"') and name.endswith('"') :
	727	name = name[1:-1]
	728	if fullname.startswith('"') and fullname.endswith('"') :
	729	fullname = fullname[1:-1]
	730	print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname)
	731	os.remove(lockfilename)
[1542]	732	retcode = 0
[1177]	733	elif len(sys.argv) not in (6, 7) :
	734	sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0])
	735	retcode = 1
	736	else :
	737	try :
[2210]	738	# Initializes the backend
	739	kotabackend = PyKotaBackend()
	740	kotabackend.deferredInit()
	741	retcode = kotabackend.mainWork()
	742	kotabackend.storage.close()
	743	kotabackend.closeJobDataStream()
	744	except SystemExit :
	745	retcode = -1
[1513]	746	except :
[1517]	747	try :
	748	kotabackend.crashed("cupspykota backend failed")
	749	except :
[1542]	750	crashed("cupspykota backend failed")
	751	retcode = 1
[1177]	752
	753	sys.exit(retcode)

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