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#!/usr/bin/python
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#
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# Copyright (C) 2011 Google Inc.
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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, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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# 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., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA.
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"""Script for testing for an issue in PycURL"""
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import sys
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import warnings
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import unittest
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import textwrap
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import pycurl
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import testutils
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DETAILS = [
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  ("PycURL 7.19.0 added a new function named \"reset\" on \"pycurl.Curl\""
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   " objects to release all references to other resources. Unfortunately that"
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   " version contains a bug with reference counting on the \"None\" singleton,"
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   " leading to a crash of the Python interpreter after a certain amount of"
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   " performed requests. Your system uses a version of PycURL affected by this"
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   " issue. A patch is available at [1]. A detailed description can be found"
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   " at [2].\n"),
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  "\n",
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  ("[1] http://sf.net/tracker/?"
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   "func=detail&aid=2893665&group_id=28236&atid=392777\n"),
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  "[2] https://bugzilla.redhat.com/show_bug.cgi?id=624559",
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  ]
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class TestPyCurlReset(unittest.TestCase):
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  def test(self):
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    start_refcount = sys.getrefcount(None)
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    abort_refcount = int(start_refcount * 0.8)
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    assert start_refcount > 100
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    curl = pycurl.Curl()
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    try:
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      reset_fn = curl.reset
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    except AttributeError:
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      pass
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    else:
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      for i in range(start_refcount * 2):
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        reset_fn()
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        # The bug can be detected if calling "reset" several times continously
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        # reduces the number of references
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        if sys.getrefcount(None) < abort_refcount:
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          print >>sys.stderr, "#" * 78
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          for line in DETAILS:
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            print >>sys.stderr, textwrap.fill(line, width=78)
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          print >>sys.stderr, "#" * 78
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          break
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if __name__ == "__main__":
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  testutils.GanetiTestProgram()