#
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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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"""Utility methods for testing
For internal use only; no backwards-compatibility guarantees.
"""
import hashlib
import imp
from mock import Mock
from mock import patch
from apache_beam.io.filesystems import FileSystems
from apache_beam.utils import retry
DEFAULT_HASHING_ALG = 'sha1'
[docs]def compute_hash(content, hashing_alg=DEFAULT_HASHING_ALG):
"""Compute a hash value from a list of string."""
content.sort()
m = hashlib.new(hashing_alg)
for elem in content:
m.update(str(elem))
return m.hexdigest()
[docs]def patch_retry(testcase, module):
"""A function to patch retry module to use mock clock and logger.
Clock and logger that defined in retry decorator will be replaced in test
in order to skip sleep phase when retry happens.
Args:
testcase: An instance of unittest.TestCase that calls this function to
patch retry module.
module: The module that uses retry and need to be replaced with mock
clock and logger in test.
"""
real_retry_with_exponential_backoff = retry.with_exponential_backoff
def patched_retry_with_exponential_backoff(num_retries, retry_filter):
"""A patch for retry decorator to use a mock dummy clock and logger."""
return real_retry_with_exponential_backoff(
num_retries=num_retries, retry_filter=retry_filter, logger=Mock(),
clock=Mock())
patch.object(retry, 'with_exponential_backoff',
side_effect=patched_retry_with_exponential_backoff).start()
# Reload module after patching.
imp.reload(module)
def remove_patches():
patch.stopall()
# Reload module again after removing patch.
imp.reload(module)
testcase.addCleanup(remove_patches)
@retry.with_exponential_backoff(
num_retries=3,
retry_filter=retry.retry_on_beam_io_error_filter)
def delete_files(file_paths):
"""A function to clean up files or directories using ``FileSystems``.
Glob is supported in file path and directories will be deleted recursively.
Args:
file_paths: A list of strings contains file paths or directories.
"""
if len(file_paths) == 0:
raise RuntimeError('Clean up failed. Invalid file path: %s.' %
file_paths)
FileSystems.delete(file_paths)