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101 lines
3.2 KiB
Python
101 lines
3.2 KiB
Python
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# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
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#
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# This module is part of GitDB and is released under
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# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
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"""Test for object db"""
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import tempfile
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import os
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from gitdb.test.lib import TestBase
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from gitdb.util import (
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to_hex_sha,
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to_bin_sha,
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NULL_HEX_SHA,
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LockedFD
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)
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class TestUtils(TestBase):
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def test_basics(self):
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assert to_hex_sha(NULL_HEX_SHA) == NULL_HEX_SHA
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assert len(to_bin_sha(NULL_HEX_SHA)) == 20
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assert to_hex_sha(to_bin_sha(NULL_HEX_SHA)) == NULL_HEX_SHA.encode("ascii")
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def _cmp_contents(self, file_path, data):
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# raise if data from file at file_path
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# does not match data string
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with open(file_path, "rb") as fp:
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assert fp.read() == data.encode("ascii")
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def test_lockedfd(self):
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my_file = tempfile.mktemp()
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orig_data = "hello"
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new_data = "world"
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with open(my_file, "wb") as my_file_fp:
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my_file_fp.write(orig_data.encode("ascii"))
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try:
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lfd = LockedFD(my_file)
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lockfilepath = lfd._lockfilepath()
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# cannot end before it was started
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self.failUnlessRaises(AssertionError, lfd.rollback)
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self.failUnlessRaises(AssertionError, lfd.commit)
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# open for writing
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assert not os.path.isfile(lockfilepath)
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wfd = lfd.open(write=True)
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assert lfd._fd is wfd
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assert os.path.isfile(lockfilepath)
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# write data and fail
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os.write(wfd, new_data.encode("ascii"))
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lfd.rollback()
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assert lfd._fd is None
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self._cmp_contents(my_file, orig_data)
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assert not os.path.isfile(lockfilepath)
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# additional call doesn't fail
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lfd.commit()
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lfd.rollback()
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# test reading
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lfd = LockedFD(my_file)
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rfd = lfd.open(write=False)
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assert os.read(rfd, len(orig_data)) == orig_data.encode("ascii")
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assert os.path.isfile(lockfilepath)
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# deletion rolls back
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del(lfd)
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assert not os.path.isfile(lockfilepath)
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# write data - concurrently
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lfd = LockedFD(my_file)
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olfd = LockedFD(my_file)
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assert not os.path.isfile(lockfilepath)
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wfdstream = lfd.open(write=True, stream=True) # this time as stream
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assert os.path.isfile(lockfilepath)
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# another one fails
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self.failUnlessRaises(IOError, olfd.open)
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wfdstream.write(new_data.encode("ascii"))
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lfd.commit()
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assert not os.path.isfile(lockfilepath)
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self._cmp_contents(my_file, new_data)
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# could test automatic _end_writing on destruction
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finally:
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os.remove(my_file)
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# END final cleanup
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# try non-existing file for reading
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lfd = LockedFD(tempfile.mktemp())
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try:
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lfd.open(write=False)
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except OSError:
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assert not os.path.exists(lfd._lockfilepath())
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else:
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self.fail("expected OSError")
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# END handle exceptions
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