525050654a
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2042 fd906abe-77d9-0310-91a1-e0d9ade77398
89 lines
2.6 KiB
Python
89 lines
2.6 KiB
Python
#
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# Copyright (c) 2005 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Management of filesystem images (plots) and corresponding views.
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$Id$
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"""
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import os
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import time
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from zope.interface import Interface, implements
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from zope.cachedescriptors.property import Lazy
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from cybertools.util import randomname, jeep
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class CachedImage(object):
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""" Keep information about temporary image files.
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"""
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def __init__(self, path, name=None):
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self.path = path
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if name is None:
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self.name = randomname.generateName(lambda x: x not in cachedImages)
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else:
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self.name = name
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self.timeStamp = int(time.time())
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cachedImages = jeep.Jeep()
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def registerImage(filename, name=None):
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image = CachedImage(filename, name)
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cachedImages.append(image)
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while len(cachedImages) > 10: # clean up old cache entries
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old = cachedImages.pop(0).path
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if os.path.exists(old):
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os.unlink(old)
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return image.name
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class PlotView(object):
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""" Access to temporary filesystem images.
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"""
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def __init__(self, context, request):
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self.context = context
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self.request = request
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self.traverse_subpath = []
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def publishTraverse(self, request, name):
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self.traverse_subpath.append(name)
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return self
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def __call__(self):
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if self.traverse_subpath:
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key = self.traverse_subpath[0]
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else:
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key = self.request.form.get('image', 'not_found')
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path = cachedImages[key].path
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self.setHeaders(path)
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f = open(path, 'rb')
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data = f.read()
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f.close()
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return data
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def setHeaders(self, name=None):
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response = self.request.response
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# TODO: get content type from name (extension)
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response.setHeader('Content-Type', 'image/jpeg')
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response.setHeader('Expires', 'Sat, 1 Jan 2000 00:00:00 GMT');
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response.setHeader('Pragma', 'no-cache');
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