root / pykota / trunk / pykota / storage.py @ 1624

Revision 1624, 26.2 kB (checked in by jalet, 20 years ago)

Hardware accounting for LPRng should be OK now. UNTESTED.

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1# PyKota
2# -*- coding: ISO-8859-15 -*-
3#
4# PyKota : Print Quotas for CUPS and LPRng
5#
6# (c) 2003-2004 Jerome Alet <alet@librelogiciel.com>
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program; if not, write to the Free Software
19# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
20#
21# $Id$
22#
23# $Log$
24# Revision 1.57  2004/07/22 22:41:48  jalet
25# Hardware accounting for LPRng should be OK now. UNTESTED.
26#
27# Revision 1.56  2004/07/01 17:45:49  jalet
28# Added code to handle the description field for printers
29#
30# Revision 1.55  2004/06/05 22:18:04  jalet
31# Now catches some exceptions earlier.
32# storage.py and ldapstorage.py : removed old comments
33#
34# Revision 1.54  2004/06/05 22:03:49  jalet
35# Payments history is now stored in database
36#
37# Revision 1.53  2004/06/03 23:14:10  jalet
38# Now stores the job's size in bytes in the database.
39# Preliminary work on payments storage : database schemas are OK now,
40# but no code to store payments yet.
41# Removed schema picture, not relevant anymore.
42#
43# Revision 1.52  2004/05/26 14:49:57  jalet
44# First try at saving the job-originating-hostname in the database
45#
46# Revision 1.51  2004/03/24 15:15:24  jalet
47# Began integration of Henrik Janhagen's work on quota-then-balance
48# and balance-then-quota
49#
50# Revision 1.50  2004/03/09 08:05:27  jalet
51# Small fix : only keeps existing quota entries when searching parents
52#
53# Revision 1.49  2004/03/01 15:06:51  jalet
54# Pre and Post hooks should now work in the pykota filter too.
55# The pykota filter doesn't check the last user's quota anymore
56# when delayed hardware accounting is used : this will be checked
57# anyway the next time the last user will print
58#
59# Revision 1.48  2004/02/27 13:50:12  jalet
60# Hopefully the final fix for groups (users and printers)
61#
62# Revision 1.47  2004/02/27 09:30:33  jalet
63# datelimit wasn't reset when modifying soft and hard limits with the LDAP backend
64#
65# Revision 1.46  2004/02/26 14:18:07  jalet
66# Should fix the remaining bugs wrt printers groups and users groups.
67#
68# Revision 1.45  2004/02/26 10:40:40  jalet
69# Fixed nested printer groups accounting.
70#
71# Revision 1.44  2004/02/25 19:09:24  jalet
72# Fix for LDAP problem when job price was 0.
73#
74# Revision 1.43  2004/02/25 12:36:34  jalet
75# Avoids a database query even if caching was disabled.
76#
77# Revision 1.42  2004/02/23 22:53:21  jalet
78# Don't retrieve data when it's not needed, to avoid database queries
79#
80# Revision 1.41  2004/02/04 17:12:33  jalet
81# Removing a printer from a printers group should work now.
82#
83# Revision 1.40  2004/02/04 13:24:41  jalet
84# pkprinters can now remove printers from printers groups.
85#
86# Revision 1.39  2004/02/04 11:16:59  jalet
87# pkprinters command line tool added.
88#
89# Revision 1.38  2004/01/12 22:43:40  jalet
90# New formula to compute a job's price
91#
92# Revision 1.37  2004/01/12 14:35:01  jalet
93# Printing history added to CGI script.
94#
95# Revision 1.36  2004/01/10 09:44:02  jalet
96# Fixed potential accuracy problem if a user printed on several printers at
97# the very same time.
98#
99# Revision 1.35  2004/01/08 16:33:27  jalet
100# Additionnal check to not create a circular printers group.
101#
102# Revision 1.34  2004/01/08 16:24:49  jalet
103# edpykota now supports adding printers to printer groups.
104#
105# Revision 1.33  2004/01/08 14:10:32  jalet
106# Copyright year changed.
107#
108# Revision 1.32  2004/01/06 16:02:57  jalet
109# This time printer groups caching works.
110#
111# Revision 1.31  2004/01/06 15:51:24  jalet
112# Fixed caching of printer groups
113#
114# Revision 1.30  2004/01/06 14:24:59  jalet
115# Printer groups should be cached now, if caching is enabled.
116#
117# Revision 1.29  2003/12/27 16:49:25  uid67467
118# Should be ok now.
119#
120# Revision 1.28  2003/11/25 23:46:40  jalet
121# Don't try to verify if module name is valid, Python does this better than us.
122#
123# Revision 1.27  2003/11/23 19:01:36  jalet
124# Job price added to history
125#
126# Revision 1.26  2003/11/21 14:28:45  jalet
127# More complete job history.
128#
129# Revision 1.25  2003/10/08 21:12:27  jalet
130# Do not cache anymore entries which don't exist.
131#
132# Revision 1.24  2003/10/07 22:06:05  jalet
133# Preliminary code to disable job history
134#
135# Revision 1.23  2003/10/07 09:07:28  jalet
136# Character encoding added to please latest version of Python
137#
138# Revision 1.22  2003/10/06 13:12:27  jalet
139# More work on caching
140#
141# Revision 1.21  2003/10/03 09:02:20  jalet
142# Logs cache store actions too
143#
144# Revision 1.20  2003/10/02 20:23:18  jalet
145# Storage caching mechanism added.
146#
147# Revision 1.19  2003/07/16 21:53:07  jalet
148# Really big modifications wrt new configuration file's location and content.
149#
150# Revision 1.18  2003/07/07 08:33:18  jalet
151# Bug fix due to a typo in LDAP code
152#
153# Revision 1.17  2003/07/05 07:46:50  jalet
154# The previous bug fix was incomplete.
155#
156# Revision 1.16  2003/06/25 19:52:31  jalet
157# Should be ready for testing :-)
158#
159# Revision 1.15  2003/06/25 14:10:58  jalet
160# Exception raising for now.
161#
162# Revision 1.14  2003/06/25 14:10:01  jalet
163# Hey, it may work (edpykota --reset excepted) !
164#
165# Revision 1.13  2003/06/10 16:37:54  jalet
166# Deletion of the second user which is not needed anymore.
167# Added a debug configuration field in /etc/pykota.conf
168# All queries can now be sent to the logger in debug mode, this will
169# greatly help improve performance when time for this will come.
170#
171# Revision 1.12  2003/04/23 22:13:57  jalet
172# Preliminary support for LPRng added BUT STILL UNTESTED.
173#
174# Revision 1.11  2003/04/10 21:47:20  jalet
175# Job history added. Upgrade script neutralized for now !
176#
177# Revision 1.10  2003/03/29 13:45:27  jalet
178# GPL paragraphs were incorrectly (from memory) copied into the sources.
179# Two README files were added.
180# Upgrade script for PostgreSQL pre 1.01 schema was added.
181#
182# Revision 1.9  2003/02/17 22:55:01  jalet
183# More options can now be set per printer or globally :
184#
185#       admin
186#       adminmail
187#       gracedelay
188#       requester
189#
190# the printer option has priority when both are defined.
191#
192# Revision 1.8  2003/02/17 22:05:50  jalet
193# Storage backend now supports admin and user passwords (untested)
194#
195# Revision 1.7  2003/02/10 12:07:31  jalet
196# Now repykota should output the recorded total page number for each printer too.
197#
198# Revision 1.6  2003/02/09 13:05:43  jalet
199# Internationalization continues...
200#
201# Revision 1.5  2003/02/08 22:39:46  jalet
202# --reset command line option added
203#
204# Revision 1.4  2003/02/08 09:59:59  jalet
205# Added preliminary base class for all storages
206#
207# Revision 1.3  2003/02/05 22:10:29  jalet
208# Typos
209#
210# Revision 1.2  2003/02/05 22:02:22  jalet
211# __import__ statement didn't work as expected
212#
213# Revision 1.1  2003/02/05 21:28:17  jalet
214# Initial import into CVS
215#
216#
217#
218
219class PyKotaStorageError(Exception):
220    """An exception for Quota Storage related stuff."""
221    def __init__(self, message = ""):
222        self.message = message
223        Exception.__init__(self, message)
224    def __repr__(self):
225        return self.message
226    __str__ = __repr__
227       
228class StorageObject :
229    """Object present in the Quota Storage."""
230    def __init__(self, parent) :
231        "Initialize minimal data."""
232        self.parent = parent
233        self.ident = None
234        self.Exists = 0
235       
236class StorageUser(StorageObject) :       
237    """User class."""
238    def __init__(self, parent, name) :
239        StorageObject.__init__(self, parent)
240        self.Name = name
241        self.LimitBy = None
242        self.AccountBalance = None
243        self.LifeTimePaid = None
244        self.Email = None
245        self.Payments = [] # TODO : maybe handle this smartly for SQL, for now just don't retrieve them
246       
247    def consumeAccountBalance(self, amount) :     
248        """Consumes an amount of money from the user's account balance."""
249        self.parent.decreaseUserAccountBalance(self, amount)
250        self.AccountBalance = float(self.AccountBalance or 0.0) - amount
251       
252    def setAccountBalance(self, balance, lifetimepaid) :   
253        """Sets the user's account balance in case he pays more money."""
254        diff = float(lifetimepaid or 0.0) - float(self.LifeTimePaid or 0.0)
255        self.parent.beginTransaction()
256        try :
257            self.parent.writeUserAccountBalance(self, balance, lifetimepaid)
258            self.parent.writeNewPayment(self, diff)
259        except PyKotaStorageError, msg :   
260            self.parent.rollbackTransaction()
261            raise PyKotaStorageError, msg
262        else :   
263            self.parent.commitTransaction()
264            self.AccountBalance = balance
265            self.LifeTimePaid = lifetimepaid
266       
267    def setLimitBy(self, limitby) :   
268        """Sets the user's limiting factor."""
269        try :
270            limitby = limitby.lower()
271        except AttributeError :   
272            limitby = "quota"
273        if limitby in ["quota", "balance", "quota-then-balance", "balance-then-quota"] :
274            self.parent.writeUserLimitBy(self, limitby)
275            self.LimitBy = limitby
276       
277    def delete(self) :   
278        """Deletes an user from the Quota Storage."""
279        self.parent.beginTransaction()
280        try :
281            self.parent.deleteUser(self)
282        except PyKotaStorageError, msg :   
283            self.parent.rollbackTransaction()
284            raise PyKotaStorageError, msg
285        else :   
286            self.parent.commitTransaction()
287       
288class StorageGroup(StorageObject) :       
289    """User class."""
290    def __init__(self, parent, name) :
291        StorageObject.__init__(self, parent)
292        self.Name = name
293        self.LimitBy = None
294        self.AccountBalance = None
295        self.LifeTimePaid = None
296       
297    def setLimitBy(self, limitby) :   
298        """Sets the user's limiting factor."""
299        try :
300            limitby = limitby.lower()
301        except AttributeError :   
302            limitby = "quota"
303        if limitby in ["quota", "balance"] :
304            self.parent.writeGroupLimitBy(self, limitby)
305            self.LimitBy = limitby
306       
307    def delete(self) :   
308        """Deletes a group from the Quota Storage."""
309        self.parent.beginTransaction()
310        try :
311            self.parent.deleteGroup(self)
312        except PyKotaStorageError, msg :   
313            self.parent.rollbackTransaction()
314            raise PyKotaStorageError, msg
315        else :   
316            self.parent.commitTransaction()
317       
318class StoragePrinter(StorageObject) :
319    """Printer class."""
320    def __init__(self, parent, name) :
321        StorageObject.__init__(self, parent)
322        self.Name = name
323        self.PricePerPage = None
324        self.PricePerJob = None
325        self.Description = None
326       
327    def __getattr__(self, name) :   
328        """Delays data retrieval until it's really needed."""
329        if name == "LastJob" : 
330            self.LastJob = self.parent.getPrinterLastJob(self)
331            return self.LastJob
332        else :
333            raise AttributeError, name
334           
335    def addJobToHistory(self, jobid, user, pagecounter, action, jobsize=None, jobprice=None, filename=None, title=None, copies=None, options=None, clienthost=None, jobsizebytes=None) :
336        """Adds a job to the printer's history."""
337        self.parent.writeJobNew(self, user, jobid, pagecounter, action, jobsize, jobprice, filename, title, copies, options, clienthost, jobsizebytes)
338        # TODO : update LastJob object ? Probably not needed.
339       
340    def addPrinterToGroup(self, printer) :   
341        """Adds a printer to a printer group."""
342        if (printer not in self.parent.getParentPrinters(self)) and (printer.ident != self.ident) :
343            self.parent.writePrinterToGroup(self, printer)
344            # TODO : reset cached value for printer parents, or add new parent to cached value
345           
346    def delPrinterFromGroup(self, printer) :   
347        """Deletes a printer from a printer group."""
348        self.parent.removePrinterFromGroup(self, printer)
349        # TODO : reset cached value for printer parents, or add new parent to cached value
350       
351    def setPrices(self, priceperpage = None, priceperjob = None) :   
352        """Sets the printer's prices."""
353        if priceperpage is None :
354            priceperpage = self.PricePerPage
355        else :   
356            self.PricePerPage = float(priceperpage)
357        if priceperjob is None :   
358            priceperjob = self.PricePerJob
359        else :   
360            self.PricePerJob = float(priceperjob)
361        self.parent.writePrinterPrices(self)
362       
363    def setDescription(self, description = None) :   
364        """Sets the printer's prices."""
365        if description is None :
366            description = self.Description
367        else :   
368            self.Description = str(description)
369        self.parent.writePrinterDescription(self)
370       
371    def delete(self) :   
372        """Deletes a printer from the Quota Storage."""
373        self.parent.beginTransaction()
374        try :
375            self.parent.deletePrinter(self)
376        except PyKotaStorageError, msg :   
377            self.parent.rollbackTransaction()
378            raise PyKotaStorageError, msg
379        else :   
380            self.parent.commitTransaction()
381       
382class StorageUserPQuota(StorageObject) :
383    """User Print Quota class."""
384    def __init__(self, parent, user, printer) :
385        StorageObject.__init__(self, parent)
386        self.User = user
387        self.Printer = printer
388        self.PageCounter = None
389        self.LifePageCounter = None
390        self.SoftLimit = None
391        self.HardLimit = None
392        self.DateLimit = None
393       
394    def __getattr__(self, name) :   
395        """Delays data retrieval until it's really needed."""
396        if name == "ParentPrintersUserPQuota" : 
397            self.ParentPrintersUserPQuota = (self.User.Exists and self.Printer.Exists and self.parent.getParentPrintersUserPQuota(self)) or []
398            return self.ParentPrintersUserPQuota
399        else :
400            raise AttributeError, name
401       
402    def setDateLimit(self, datelimit) :   
403        """Sets the date limit for this quota."""
404        date = "%04i-%02i-%02i %02i:%02i:%02i" % (datelimit.year, datelimit.month, datelimit.day, datelimit.hour, datelimit.minute, datelimit.second)
405        self.parent.writeUserPQuotaDateLimit(self, date)
406        self.DateLimit = date
407       
408    def setLimits(self, softlimit, hardlimit) :   
409        """Sets the soft and hard limit for this quota."""
410        self.parent.writeUserPQuotaLimits(self, softlimit, hardlimit)
411        self.SoftLimit = softlimit
412        self.HardLimit = hardlimit
413        self.DateLimit = None
414       
415    def reset(self) :   
416        """Resets page counter to 0."""
417        self.parent.writeUserPQuotaPagesCounters(self, 0, int(self.LifePageCounter or 0))
418        self.PageCounter = 0
419       
420    def computeJobPrice(self, jobsize) :   
421        """Computes the job price as the sum of all parent printers' prices + current printer's ones."""
422        totalprice = 0.0   
423        if jobsize :
424            for upq in [ self ] + self.ParentPrintersUserPQuota :
425                price = (float(upq.Printer.PricePerPage or 0.0) * jobsize) + float(upq.Printer.PricePerJob or 0.0)
426                totalprice += price
427        return totalprice   
428           
429    def increasePagesUsage(self, jobsize) :
430        """Increase the value of used pages and money."""
431        jobprice = self.computeJobPrice(jobsize)
432        if jobsize :
433            self.parent.beginTransaction()
434            try :
435                if jobprice :
436                    self.User.consumeAccountBalance(jobprice)
437                for upq in [ self ] + self.ParentPrintersUserPQuota :
438                    self.parent.increaseUserPQuotaPagesCounters(upq, jobsize)
439                    upq.PageCounter = int(upq.PageCounter or 0) + jobsize
440                    upq.LifePageCounter = int(upq.LifePageCounter or 0) + jobsize
441            except PyKotaStorageError, msg :   
442                self.parent.rollbackTransaction()
443                raise PyKotaStorageError, msg
444            else :   
445                self.parent.commitTransaction()
446        return jobprice
447       
448class StorageGroupPQuota(StorageObject) :
449    """Group Print Quota class."""
450    def __init__(self, parent, group, printer) :
451        StorageObject.__init__(self, parent)
452        self.Group = group
453        self.Printer = printer
454        self.PageCounter = None
455        self.LifePageCounter = None
456        self.SoftLimit = None
457        self.HardLimit = None
458        self.DateLimit = None
459       
460    def __getattr__(self, name) :   
461        """Delays data retrieval until it's really needed."""
462        if name == "ParentPrintersGroupPQuota" : 
463            self.ParentPrintersGroupPQuota = (self.Group.Exists and self.Printer.Exists and self.parent.getParentPrintersGroupPQuota(self)) or []
464            return self.ParentPrintersGroupPQuota
465        else :
466            raise AttributeError, name
467       
468    def setDateLimit(self, datelimit) :   
469        """Sets the date limit for this quota."""
470        date = "%04i-%02i-%02i %02i:%02i:%02i" % (datelimit.year, datelimit.month, datelimit.day, datelimit.hour, datelimit.minute, datelimit.second)
471        self.parent.writeGroupPQuotaDateLimit(self, date)
472        self.DateLimit = date
473       
474    def setLimits(self, softlimit, hardlimit) :   
475        """Sets the soft and hard limit for this quota."""
476        self.parent.writeGroupPQuotaLimits(self, softlimit, hardlimit)
477        self.SoftLimit = softlimit
478        self.HardLimit = hardlimit
479        self.DateLimit = None
480       
481class StorageJob(StorageObject) :
482    """Printer's Last Job class."""
483    def __init__(self, parent) :
484        StorageObject.__init__(self, parent)
485        self.UserName = None
486        self.PrinterName = None
487        self.JobId = None
488        self.PrinterPageCounter = None
489        self.JobSizeBytes = None
490        self.JobSize = None
491        self.JobAction = None
492        self.JobDate = None
493        self.JobPrice = None
494        self.JobFileName = None
495        self.JobTitle = None
496        self.JobCopies = None
497        self.JobOptions = None
498        self.JobHostName = None
499       
500    def __getattr__(self, name) :   
501        """Delays data retrieval until it's really needed."""
502        if name == "User" : 
503            self.User = self.parent.getUser(self.UserName)
504            return self.User
505        elif name == "Printer" :   
506            self.Printer = self.parent.getPrinter(self.PrinterName)
507            return self.Printer
508        else :
509            raise AttributeError, name
510       
511class StorageLastJob(StorageJob) :
512    """Printer's Last Job class."""
513    def __init__(self, parent, printer) :
514        StorageJob.__init__(self, parent)
515        self.PrinterName = printer.Name # not needed
516        self.Printer = printer
517       
518class BaseStorage :
519    def __init__(self, pykotatool) :
520        """Opens the storage connection."""
521        self.closed = 1
522        self.tool = pykotatool
523        self.usecache = pykotatool.config.getCaching()
524        self.disablehistory = pykotatool.config.getDisableHistory()
525        if self.usecache :
526            self.tool.logdebug("Caching enabled.")
527            self.caches = { "USERS" : {}, "GROUPS" : {}, "PRINTERS" : {}, "USERPQUOTAS" : {}, "GROUPPQUOTAS" : {}, "JOBS" : {}, "LASTJOBS" : {} }
528       
529    def close(self) :   
530        """Must be overriden in children classes."""
531        raise RuntimeError, "BaseStorage.close() must be overriden !"
532       
533    def __del__(self) :       
534        """Ensures that the database connection is closed."""
535        self.close()
536       
537    def getFromCache(self, cachetype, key) :
538        """Tries to extract something from the cache."""
539        if self.usecache :
540            entry = self.caches[cachetype].get(key)
541            if entry is not None :
542                self.tool.logdebug("Cache hit (%s->%s)" % (cachetype, key))
543            else :   
544                self.tool.logdebug("Cache miss (%s->%s)" % (cachetype, key))
545            return entry   
546           
547    def cacheEntry(self, cachetype, key, value) :       
548        """Puts an entry in the cache."""
549        if self.usecache and getattr(value, "Exists", 0) :
550            self.caches[cachetype][key] = value
551            self.tool.logdebug("Cache store (%s->%s)" % (cachetype, key))
552           
553    def getUser(self, username) :       
554        """Returns the user from cache."""
555        user = self.getFromCache("USERS", username)
556        if user is None :
557            user = self.getUserFromBackend(username)
558            self.cacheEntry("USERS", username, user)
559        return user   
560       
561    def getGroup(self, groupname) :       
562        """Returns the group from cache."""
563        group = self.getFromCache("GROUPS", groupname)
564        if group is None :
565            group = self.getGroupFromBackend(groupname)
566            self.cacheEntry("GROUPS", groupname, group)
567        return group   
568       
569    def getPrinter(self, printername) :       
570        """Returns the printer from cache."""
571        printer = self.getFromCache("PRINTERS", printername)
572        if printer is None :
573            printer = self.getPrinterFromBackend(printername)
574            self.cacheEntry("PRINTERS", printername, printer)
575        return printer   
576       
577    def getUserPQuota(self, user, printer) :       
578        """Returns the user quota information from cache."""
579        useratprinter = "%s@%s" % (user.Name, printer.Name)
580        upquota = self.getFromCache("USERPQUOTAS", useratprinter)
581        if upquota is None :
582            upquota = self.getUserPQuotaFromBackend(user, printer)
583            self.cacheEntry("USERPQUOTAS", useratprinter, upquota)
584        return upquota   
585       
586    def getGroupPQuota(self, group, printer) :       
587        """Returns the group quota information from cache."""
588        groupatprinter = "%s@%s" % (group.Name, printer.Name)
589        gpquota = self.getFromCache("GROUPPQUOTAS", groupatprinter)
590        if gpquota is None :
591            gpquota = self.getGroupPQuotaFromBackend(group, printer)
592            self.cacheEntry("GROUPPQUOTAS", groupatprinter, gpquota)
593        return gpquota   
594       
595    def getPrinterLastJob(self, printer) :       
596        """Extracts last job information for a given printer from cache."""
597        lastjob = self.getFromCache("LASTJOBS", printer.Name)
598        if lastjob is None :
599            lastjob = self.getPrinterLastJobFromBackend(printer)
600            self.cacheEntry("LASTJOBS", printer.Name, lastjob)
601        return lastjob   
602       
603    def getParentPrinters(self, printer) :   
604        """Extracts parent printers information for a given printer from cache."""
605        if self.usecache :
606            if not hasattr(printer, "Parents") :
607                self.tool.logdebug("Cache miss (%s->Parents)" % printer.Name)
608                printer.Parents = self.getParentPrintersFromBackend(printer)
609                self.tool.logdebug("Cache store (%s->Parents)" % printer.Name)
610            else :
611                self.tool.logdebug("Cache hit (%s->Parents)" % printer.Name)
612        else :       
613            printer.Parents = self.getParentPrintersFromBackend(printer)
614        for parent in printer.Parents[:] :   
615            printer.Parents.extend(self.getParentPrinters(parent))
616        uniquedic = {}   
617        for parent in printer.Parents :
618            uniquedic[parent.Name] = parent
619        printer.Parents = uniquedic.values()   
620        return printer.Parents
621       
622    def getGroupMembers(self, group) :       
623        """Returns the group's members list from in-group cache."""
624        if self.usecache :
625            if not hasattr(group, "Members") :
626                self.tool.logdebug("Cache miss (%s->Members)" % group.Name)
627                group.Members = self.getGroupMembersFromBackend(group)
628                self.tool.logdebug("Cache store (%s->Members)" % group.Name)
629            else :
630                self.tool.logdebug("Cache hit (%s->Members)" % group.Name)
631        else :       
632            group.Members = self.getGroupMembersFromBackend(group)
633        return group.Members   
634       
635    def getUserGroups(self, user) :       
636        """Returns the user's groups list from in-user cache."""
637        if self.usecache :
638            if not hasattr(user, "Groups") :
639                self.tool.logdebug("Cache miss (%s->Groups)" % user.Name)
640                user.Groups = self.getUserGroupsFromBackend(user)
641                self.tool.logdebug("Cache store (%s->Groups)" % user.Name)
642            else :
643                self.tool.logdebug("Cache hit (%s->Groups)" % user.Name)
644        else :       
645            user.Groups = self.getUserGroupsFromBackend(user)
646        return user.Groups   
647       
648    def getParentPrintersUserPQuota(self, userpquota) :     
649        """Returns all user print quota on the printer and all its parents recursively."""
650        upquotas = [ ]
651        for printer in self.getParentPrinters(userpquota.Printer) :
652            upq = self.getUserPQuota(userpquota.User, printer)
653            if upq.Exists :
654                upquotas.append(upq)
655        return upquotas       
656       
657    def getParentPrintersGroupPQuota(self, grouppquota) :     
658        """Returns all group print quota on the printer and all its parents recursively."""
659        gpquotas = [ ]
660        for printer in self.getParentPrinters(grouppquota.Printer) :
661            gpq = self.getGroupPQuota(grouppquota.Group, printer)
662            if gpq.Exists :
663                gpquotas.append(gpq)
664        return gpquotas       
665       
666def openConnection(pykotatool) :
667    """Returns a connection handle to the appropriate Quota Storage Database."""
668    backendinfo = pykotatool.config.getStorageBackend()
669    backend = backendinfo["storagebackend"]
670    try :
671        exec "from pykota.storages import %s as storagebackend" % backend.lower()
672    except ImportError :
673        raise PyKotaStorageError, _("Unsupported quota storage backend %s") % backend
674    else :   
675        host = backendinfo["storageserver"]
676        database = backendinfo["storagename"]
677        admin = backendinfo["storageadmin"] or backendinfo["storageuser"]
678        adminpw = backendinfo["storageadminpw"] or backendinfo["storageuserpw"]
679        return storagebackend.Storage(pykotatool, host, database, admin, adminpw)
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