54 lines
1.4 KiB
Python
54 lines
1.4 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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This file is part of the web2py Web Framework
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Copyrighted by Massimo Di Pierro <mdipierro@cs.depaul.edu>
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License: LGPLv3 (http://www.gnu.org/licenses/lgpl.html)
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Functions required to execute app components
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============================================
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FOR INTERNAL USE ONLY
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"""
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from os import stat
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import thread
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import logging
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from fileutils import read_file
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cfs = {} # for speed-up
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cfs_lock = thread.allocate_lock() # and thread safety
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def getcfs(key, filename, filter=None):
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"""
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Caches the *filtered* file `filename` with `key` until the file is
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modified.
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:param key: the cache key
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:param filename: the file to cache
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:param filter: is the function used for filtering. Normally `filename` is a
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.py file and `filter` is a function that bytecode compiles the file.
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In this way the bytecode compiled file is cached. (Default = None)
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This is used on Google App Engine since pyc files cannot be saved.
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"""
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try:
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t = stat(filename).st_mtime
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except OSError:
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return filter() if callable(filter) else ''
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cfs_lock.acquire()
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item = cfs.get(key, None)
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cfs_lock.release()
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if item and item[0] == t:
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return item[1]
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if not callable(filter):
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data = read_file(filename)
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else:
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data = filter()
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cfs_lock.acquire()
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cfs[key] = (t, data)
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cfs_lock.release()
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return data
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