manipulation.py

   1 # -*- coding: utf-8 -*-
   2 ############################################################
   3 # Copyright © 2005-2010  Benoît PIN <benoit.pin@ensmp.fr>  #
   4 # Plinn - http://plinn.org                                 #
   5 #                                                          #
   6 # This program is free software; you can redistribute it   #
   7 # and/or modify it under the terms of the Creative Commons #
   8 # "Attribution-Noncommercial 2.0 Generic"                  #
   9 # http://creativecommons.org/licenses/by-nc/2.0/           #
  10 ############################################################
  11 """ Image threaded batch computation module
  12 """
  13
  14 import threading
  15 import logging
  16 import atexit
  17 from types import StringTypes
  18 from math import ceil
  19 import transaction
  20 from ZODB.POSException import ConflictError
  21 from cStringIO import StringIO
  22
  23 console = logging.getLogger('[manipulation thread]')
  24
  25 class ImageQueueProcessorThread(threading.Thread) :
  26         """This thread is started at zope startup
  27         """
  28
  29         __stopped = False
  30
  31
  32         def __init__(self, portal_path, itemsPath) :
  33                 threading.Thread.__init__(self)
  34                 self.portal_path = portal_path
  35                 self.queue = []
  36                 if isinstance(itemsPath, StringTypes) :
  37                         itemsPath = [itemsPath]
  38                 for i in itemsPath :
  39                         self.queueAdd(i)
  40
  41         @property
  42         def queueSize(self) :
  43                 return len(self.queue)
  44
  45         def queueAdd(self, itemPath) :
  46                 self.queue.append(itemPath)
  47
  48         def run(self) :
  49                 console.info('process started.')
  50                 #atexit.register(self.stop)
  51                 import Zope2
  52                 app = Zope2.app()
  53                 while not self.__stopped and self.queueSize :
  54                         self._process(app)
  55
  56                 con = app._p_jar
  57                 con.close()
  58                 #con.close()
  59                 console.info('process finished.')
  60                 #print con
  61                 #print con.transaction_manager
  62
  63
  64         def stop(self):
  65                 console.info('process stopped.')
  66                 self.__stopped = True
  67
  68         def _process(self, app) :
  69                 path = self.queue.pop(0)
  70                 try :
  71                         p = app.unrestrictedTraverse(path)
  72                 except KeyError :
  73                         console.warn('deleted during processing: %s' % path)
  74                         return
  75
  76                 console.info('%d : %s' % (self.queueSize, p.absolute_url()))
  77
  78                 try :
  79                         if not hasattr(p, 'thumbnail'):
  80                                 p.makeThumbnail()
  81                                 # print 'make thumbnail'
  82
  83                         for size in ((500, 500), (600, 600), (800, 800)) :
  84                                 # print 'resize at', size
  85                                 p._getResizedImage(size, True)
  86                                 transaction.commit()
  87
  88                         zMin = p.tiles_min_zoom
  89                         zMax = p.tiles_max_zoom
  90                         zStep = p.tiles_step_zoom
  91                         levels = range(zMin, zMax + zStep, zStep)
  92                         zooms = [l/100. for l in levels]
  93                         todo =  set(zooms) - set(p._tiles.keys())
  94                         if todo :
  95                                 if p.tileGenerationLock.locked() :
  96                                         console.info('skip %s: already tiling.' % p.absolute_url())
  97                                         return
  98
  99                                 p.tileGenerationLock.acquire()
 100                                 zooms = list(todo)
 101                                 zooms.sort()
 102                                 ppm = None
 103                                 try :
 104                                         ppm = p._getPPM()
 105                                         for zoom in zooms :
 106
 107                                                 # print 'tiling at', zoom
 108                                                 if zoom < 1 :
 109                                                         rppm = ppm.resize(ratio=zoom)
 110                                                 else :
 111                                                         rppm = ppm
 112                                                 p._makeTilesAt(zoom, rppm)
 113                                                 del rppm
 114                                                 transaction.commit()
 115                                 finally :
 116                                         del ppm
 117                                         p.tileGenerationLock.release()
 118
 119                         try :
 120                                 delattr(p, '_v__methodResultsCache')
 121                         except AttributeError:
 122                                 pass
 123
 124                         p.tiles_available = 1
 125                         p.reindexObject(idxs=['tiles_available'])
 126                         transaction.commit()
 127
 128                 except ConflictError :
 129                         console.warn('Resync after ZODB ConflicError')
 130                         transaction.abort()
 131                         portal = app.unrestrictedTraverse(self.portal_path)
 132                         portal._p_jar.sync()
 133                         self.queueAdd(path)
 134                         return
 135                 except :
 136                         p.tiles_available = -1
 137                         import traceback
 138                         out = StringIO()
 139                         traceback.print_exc(None, out)
 140                         console.error(out.getvalue())