95 lines
3.1 KiB
Python
95 lines
3.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack, LLC
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import StringIO
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import tempfile
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from glance.common import exception
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from glance.common import utils
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from glance.tests import utils as test_utils
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class TestUtils(test_utils.BaseTestCase):
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"""Test routines in glance.utils"""
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def test_cooperative_reader(self):
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"""Ensure cooperative reader class accesses all bytes of file"""
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BYTES = 1024
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bytes_read = 0
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with tempfile.TemporaryFile('w+') as tmp_fd:
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tmp_fd.write('*' * BYTES)
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tmp_fd.seek(0)
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for chunk in utils.CooperativeReader(tmp_fd):
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bytes_read += len(chunk)
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self.assertEquals(bytes_read, BYTES)
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bytes_read = 0
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with tempfile.TemporaryFile('w+') as tmp_fd:
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tmp_fd.write('*' * BYTES)
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tmp_fd.seek(0)
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reader = utils.CooperativeReader(tmp_fd)
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byte = reader.read(1)
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while len(byte) != 0:
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bytes_read += 1
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byte = reader.read(1)
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self.assertEquals(bytes_read, BYTES)
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def test_limiting_reader(self):
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"""Ensure limiting reader class accesses all bytes of file"""
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BYTES = 1024
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bytes_read = 0
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data = StringIO.StringIO("*" * BYTES)
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for chunk in utils.LimitingReader(data, BYTES):
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bytes_read += len(chunk)
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self.assertEquals(bytes_read, BYTES)
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bytes_read = 0
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data = StringIO.StringIO("*" * BYTES)
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reader = utils.LimitingReader(data, BYTES)
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byte = reader.read(1)
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while len(byte) != 0:
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bytes_read += 1
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byte = reader.read(1)
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self.assertEquals(bytes_read, BYTES)
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def test_limiting_reader_fails(self):
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"""Ensure limiting reader class throws exceptions if limit exceeded"""
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BYTES = 1024
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def _consume_all_iter():
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bytes_read = 0
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data = StringIO.StringIO("*" * BYTES)
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for chunk in utils.LimitingReader(data, BYTES - 1):
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bytes_read += len(chunk)
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self.assertRaises(exception.ImageSizeLimitExceeded, _consume_all_iter)
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def _consume_all_read():
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bytes_read = 0
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data = StringIO.StringIO("*" * BYTES)
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reader = utils.LimitingReader(data, BYTES - 1)
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byte = reader.read(1)
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while len(byte) != 0:
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bytes_read += 1
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byte = reader.read(1)
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self.assertRaises(exception.ImageSizeLimitExceeded, _consume_all_read)
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