# Copyright 2012-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.

#

# Licensed under the Apache License, Version 2.0 (the "License"). You

# may not use this file except in compliance with the License. A copy of

# the License is located at

#

# http://aws.amazon.com/apache2.0/

#

# or in the "license" file accompanying this file. This file is

# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF

# ANY KIND, either express or implied. See the License for the specific

# language governing permissions and limitations under the License.

"""Test utilities for the AWS CLI.

This module includes various classes/functions that help in writing

CLI unit/integration tests. This module should not be imported by

any module **except** for test code. This is included in the CLI

package so that code that is not part of the CLI can still take

advantage of all the testing utilities we provide.

"""

import binascii

import contextlib

import copy

import json

import logging

import os

import platform

import random

import shutil

import string

import sys

import tempfile

import time

import unittest

import uuid

from pprint import pformat

from subprocess import PIPE, Popen

from unittest import mock

from pathlib import Path

import botocore.loaders

from botocore.awsrequest import AWSResponse

from botocore.exceptions import ClientError, WaiterError

import awscli.clidriver

from awscli.compat import BytesIO, StringIO

from awscli.utils import create_nested_client

_LOADER = botocore.loaders.Loader()

INTEG_LOG = logging.getLogger('awscli.tests.integration')

AWS_CMD = None

with tempfile.TemporaryDirectory() as tmpdir:

with open(Path(tmpdir) / 'aws-cli-tmp-file', 'w') as f:

pass

CASE_INSENSITIVE = (Path(tmpdir) / 'AWS-CLI-TMP-FILE').exists()

def skip_if_windows(reason):

"""Decorator to skip tests that should not be run on windows.

Example usage:

@skip_if_windows("Not valid")

def test_some_non_windows_stuff(self):

self.assertEqual(...)

"""

def decorator(func):

return unittest.skipIf(

platform.system() not in ['Darwin', 'Linux'], reason

)(func)

return decorator

def skip_if_case_sensitive():

def decorator(func):

return unittest.skipIf(

not CASE_INSENSITIVE,

"This test requires a case-insensitive filesystem."

)(func)

return decorator

def create_clidriver():

driver = awscli.clidriver.create_clidriver()

session = driver.session

data_path = session.get_config_variable('data_path').split(os.pathsep)

if not data_path:

data_path = []

_LOADER.search_paths.extend(data_path)

session.register_component('data_loader', _LOADER)

return driver

def get_aws_cmd():

global AWS_CMD

import awscli

if AWS_CMD is None:

# Try <repo>/bin/aws

repo_root = os.path.dirname(os.path.abspath(awscli.__file__))

aws_cmd = os.path.join(repo_root, 'bin', 'aws')

if not os.path.isfile(aws_cmd):

aws_cmd = _search_path_for_cmd('aws')

if aws_cmd is None:

raise ValueError(

'Could not find "aws" executable. Either '

'make sure it is on your PATH, or you can '

'explicitly set this value using '

'"set_aws_cmd()"'

)

AWS_CMD = aws_cmd

return AWS_CMD

def _search_path_for_cmd(cmd_name):

for path in os.environ.get('PATH', '').split(os.pathsep):

full_cmd_path = os.path.join(path, cmd_name)

if os.path.isfile(full_cmd_path):

return full_cmd_path

return None

def set_aws_cmd(aws_cmd):

global AWS_CMD

AWS_CMD = aws_cmd

@contextlib.contextmanager

def temporary_file(mode):

"""This is a cross platform temporary file creation.

tempfile.NamedTemporary file on windows creates a secure temp file

that can't be read by other processes and can't be opened a second time.

For tests, we generally *want* them to be read multiple times.

The test fixture writes the temp file contents, the test reads the

temp file.

"""

temporary_directory = tempfile.mkdtemp()

basename = 'tmpfile-%s' % str(random_chars(8))

full_filename = os.path.join(temporary_directory, basename)

open(full_filename, 'w').close()

try:

with open(full_filename, mode) as f:

yield f

finally:

shutil.rmtree(temporary_directory)

def create_bucket(session, name=None, region=None):

"""

Creates a bucket

:returns: the name of the bucket created

"""

if not region:

region = 'us-west-2'

client = create_nested_client(session, 's3', region_name=region)

if name:

bucket_name = name

else:

bucket_name = random_bucket_name()

params = {'Bucket': bucket_name, 'ObjectOwnership': 'ObjectWriter'}

if region != 'us-east-1':

params['CreateBucketConfiguration'] = {'LocationConstraint': region}

try:

client.create_bucket(**params)

except ClientError as e:

if e.response['Error'].get('Code') == 'BucketAlreadyOwnedByYou':

# This can happen in the retried request, when the first one

# succeeded on S3 but somehow the response never comes back.

# We still got a bucket ready for test anyway.

pass

else:

raise

return bucket_name

def create_dir_bucket(session, name=None, location=None):

"""

Creates a S3 directory bucket

:returns: the name of the bucket created

"""

if not location:

location = ('us-west-2', 'usw2-az1')

region, az = location

client = create_nested_client(session, 's3', region_name=region)

if name:

bucket_name = name

else:

bucket_name = f"{random_bucket_name()}--{az}--x-s3"

params = {

'Bucket': bucket_name,

'CreateBucketConfiguration': {

'Location': {'Type': 'AvailabilityZone', 'Name': az},

'Bucket': {

'Type': 'Directory',

'DataRedundancy': 'SingleAvailabilityZone',

},

},

}

try:

client.create_bucket(**params)

except ClientError as e:

if e.response['Error'].get('Code') == 'BucketAlreadyOwnedByYou':

# This can happen in the retried request, when the first one

# succeeded on S3 but somehow the response never comes back.

# We still got a bucket ready for test anyway.

pass

else:

raise

return bucket_name

def random_chars(num_chars):

"""Returns random hex characters.

Useful for creating resources with random names.

"""

return binascii.hexlify(os.urandom(int(num_chars / 2))).decode('ascii')

def random_bucket_name(prefix='awscli-s3integ', num_random=15):

"""Generate a random S3 bucket name.

:param prefix: A prefix to use in the bucket name. Useful

for tracking resources. This default value makes it easy

to see which buckets were created from CLI integ tests.

:param num_random: Number of random chars to include in the bucket name.

:returns: The name of a randomly generated bucket name as a string.

"""

return f"{prefix}-{random_chars(num_random)}-{int(time.time())}"

class BaseCLIDriverTest(unittest.TestCase):

"""Base unittest that use clidriver.

This will load all the default plugins as well so it

will simulate the behavior the user will see.

"""

def setUp(self):

self.environ = {

'AWS_DATA_PATH': os.environ['AWS_DATA_PATH'],

'AWS_DEFAULT_REGION': 'us-east-1',

'AWS_ACCESS_KEY_ID': 'access_key',

'AWS_SECRET_ACCESS_KEY': 'secret_key',

'AWS_CONFIG_FILE': '',

}

self.environ_patch = mock.patch('os.environ', self.environ)

self.environ_patch.start()

self.driver = create_clidriver()

self.session = self.driver.session

def tearDown(self):

self.environ_patch.stop()

class BaseAWSHelpOutputTest(BaseCLIDriverTest):

def setUp(self):

super().setUp()

self.renderer_patch = mock.patch('awscli.help.get_renderer')

self.renderer_mock = self.renderer_patch.start()

self.renderer = CapturedRenderer()

self.renderer_mock.return_value = self.renderer

def tearDown(self):

super().tearDown()

self.renderer_patch.stop()

def assert_contains(self, contains):

if contains not in self.renderer.rendered_contents:

self.fail(

"The expected contents:\n%s\nwere not in the "

"actual rendered contents:\n%s"

% (contains, self.renderer.rendered_contents)

)

def assert_contains_with_count(self, contains, count):

r_count = self.renderer.rendered_contents.count(contains)

if r_count != count:

self.fail(

"The expected contents:\n%s\n, with the "

"count:\n%d\nwere not in the actual rendered "

" contents:\n%s\nwith count:\n%d"

% (contains, count, self.renderer.rendered_contents, r_count)

)

def assert_not_contains(self, contents):

if contents in self.renderer.rendered_contents:

self.fail(

"The contents:\n%s\nwere not suppose to be in the "

"actual rendered contents:\n%s"

% (contents, self.renderer.rendered_contents)

)

def assert_text_order(self, *args, **kwargs):

# First we need to find where the SYNOPSIS section starts.

starting_from = kwargs.pop('starting_from')

args = list(args)

contents = self.renderer.rendered_contents

self.assertIn(starting_from, contents)

start_index = contents.find(starting_from)

arg_indices = [contents.find(arg, start_index) for arg in args]

previous = arg_indices[0]

for i, index in enumerate(arg_indices[1:], 1):

if index == -1:

self.fail(

'The string %r was not found in the contents: %s'

% (args[index], contents)

)

if index < previous:

self.fail(

'The string %r came before %r, but was suppose to come '

'after it.\n%s' % (args[i], args[i - 1], contents)

)

previous = index

class CapturedRenderer:

def __init__(self):

self.rendered_contents = ''

def render(self, contents):

self.rendered_contents = contents.decode('utf-8')

class CapturedOutput:

def __init__(self, stdout, stderr):

self.stdout = stdout

self.stderr = stderr

@contextlib.contextmanager

def capture_output():

stderr = StringIO()

stdout = StringIO()

with mock.patch('sys.stderr', stderr):

with mock.patch('sys.stdout', stdout):

yield CapturedOutput(stdout, stderr)

@contextlib.contextmanager

def capture_input(input_bytes=b''):

input_data = BytesIO(input_bytes)

mock_object = mock.Mock()

mock_object.buffer = input_data

with mock.patch('sys.stdin', mock_object):

yield input_data

class BaseAWSCommandParamsTest(unittest.TestCase):

maxDiff = None

def setUp(self):

self.last_params = {}

self.last_kwargs = None

# awscli/__init__.py injects AWS_DATA_PATH at import time

# so that we can find cli.json. This might be fixed in the

# future, but for now we just grab that value out of the real

# os.environ so the patched os.environ has this data and

# the CLI works.

self.environ = {

'AWS_DATA_PATH': os.environ['AWS_DATA_PATH'],

'AWS_DEFAULT_REGION': 'us-east-1',

'AWS_ACCESS_KEY_ID': 'access_key',

'AWS_SECRET_ACCESS_KEY': 'secret_key',

'AWS_CONFIG_FILE': '',

'AWS_SHARED_CREDENTIALS_FILE': '',

}

if os.environ.get('ComSpec'):

self.environ['ComSpec'] = os.environ['ComSpec']

self.environ_patch = mock.patch('os.environ', self.environ)

self.environ_patch.start()

self.http_response = AWSResponse(None, 200, {}, None)

self.parsed_response = {}

self.make_request_patch = mock.patch(

'botocore.endpoint.Endpoint.make_request'

)

self.make_request_is_patched = False

self.operations_called = []

self.parsed_responses = None

self.driver = create_clidriver()

def tearDown(self):

# This clears all the previous registrations.

self.environ_patch.stop()

if self.make_request_is_patched:

self.make_request_patch.stop()

self.make_request_is_patched = False

def before_call(self, params, **kwargs):

self._store_params(params)

def _store_params(self, params):

self.last_request_dict = params

self.last_params = params['body']

def patch_make_request(self):

# If you do not stop a previously started patch,

# it can never be stopped if you call start() again on the same

# patch again...

# So stop the current patch before calling start() on it again.

if self.make_request_is_patched:

self.make_request_patch.stop()

self.make_request_is_patched = False

make_request_patch = self.make_request_patch.start()

if self.parsed_responses is not None:

make_request_patch.side_effect = lambda *args, **kwargs: (

self.http_response,

self.parsed_responses.pop(0),

)

else:

make_request_patch.return_value = (

self.http_response,

self.parsed_response,

)

self.make_request_is_patched = True

def assert_params_for_cmd(

self,

cmd,

params=None,

expected_rc=0,

stderr_contains=None,

ignore_params=None,

):

stdout, stderr, rc = self.run_cmd(cmd, expected_rc)

if stderr_contains is not None:

self.assertIn(stderr_contains, stderr)

if params is not None:

# The last kwargs of Operation.call() in botocore.

last_kwargs = copy.copy(self.last_kwargs)

if ignore_params is not None:

for key in ignore_params:

try:

del last_kwargs[key]

except KeyError:

pass

if params != last_kwargs:

self.fail(

"Actual params did not match expected params.\n"

"Expected:\n\n"

"%s\n"

"Actual:\n\n%s\n" % (pformat(params), pformat(last_kwargs))

)

return stdout, stderr, rc

def before_parameter_build(self, params, model, **kwargs):

self.last_kwargs = params

self.operations_called.append((model, params.copy()))

def run_cmd(self, cmd, expected_rc=0):

logging.debug("Calling cmd: %s", cmd)

self.patch_make_request()

event_emitter = self.driver.session.get_component('event_emitter')

event_emitter.register('before-call', self.before_call)

event_emitter.register_first(

'before-parameter-build.*.*', self.before_parameter_build

)

if not isinstance(cmd, list):

cmdlist = cmd.split()

else:

cmdlist = cmd

with capture_output() as captured:

try:

rc = self.driver.main(cmdlist)

except SystemExit as e:

# We need to catch SystemExit so that we

# can get a proper rc and still present the

# stdout/stderr to the test runner so we can

# figure out what went wrong.

rc = e.code

stderr = captured.stderr.getvalue()

stdout = captured.stdout.getvalue()

self.assertEqual(

rc,

expected_rc,

"Unexpected rc (expected: %s, actual: %s) for command: %s\n"

"stdout:\n%sstderr:\n%s" % (expected_rc, rc, cmd, stdout, stderr),

)

return stdout, stderr, rc

class BaseAWSPreviewCommandParamsTest(BaseAWSCommandParamsTest):

def setUp(self):

self.preview_patch = mock.patch(

'awscli.customizations.preview.mark_as_preview'

)

self.preview_patch.start()

super().setUp()

def tearDown(self):

self.preview_patch.stop()

super().tearDown()

class BaseCLIWireResponseTest(unittest.TestCase):

def setUp(self):

self.environ = {

'AWS_DATA_PATH': os.environ['AWS_DATA_PATH'],

'AWS_DEFAULT_REGION': 'us-east-1',

'AWS_ACCESS_KEY_ID': 'access_key',

'AWS_SECRET_ACCESS_KEY': 'secret_key',

'AWS_CONFIG_FILE': '',

}

self.environ_patch = mock.patch('os.environ', self.environ)

self.environ_patch.start()

# TODO: fix this patch when we have a better way to stub out responses

self.send_patch = mock.patch('botocore.endpoint.Endpoint._send')

self.send_is_patched = False

self.driver = create_clidriver()

def tearDown(self):

self.environ_patch.stop()

if self.send_is_patched:

self.send_patch.stop()

self.send_is_patched = False

def patch_send(self, status_code=200, headers={}, content=b''):

if self.send_is_patched:

self.send_patch.stop()

self.send_is_patched = False

send_patch = self.send_patch.start()

send_patch.return_value = mock.Mock(

status_code=status_code, headers=headers, content=content

)

self.send_is_patched = True

def run_cmd(self, cmd, expected_rc=0):

if not isinstance(cmd, list):

cmdlist = cmd.split()

else:

cmdlist = cmd

with capture_output() as captured:

try:

rc = self.driver.main(cmdlist)

except SystemExit as e:

rc = e.code

stderr = captured.stderr.getvalue()

stdout = captured.stdout.getvalue()

self.assertEqual(

rc,

expected_rc,

"Unexpected rc (expected: %s, actual: %s) for command: %s\n"

"stdout:\n%sstderr:\n%s" % (expected_rc, rc, cmd, stdout, stderr),

)

return stdout, stderr, rc

class FileCreator:

def __init__(self):

self.rootdir = tempfile.mkdtemp()

def remove_all(self):

if os.path.exists(self.rootdir):

shutil.rmtree(self.rootdir)

def create_file(self, filename, contents, mtime=None, mode='w'):

"""Creates a file in a tmpdir

``filename`` should be a relative path, e.g. "foo/bar/baz.txt"

It will be translated into a full path in a tmp dir.

If the ``mtime`` argument is provided, then the file's

mtime will be set to the provided value (must be an epoch time).

Otherwise the mtime is left untouched.

``mode`` is the mode the file should be opened either as ``w`` or

`wb``.

Returns the full path to the file.

"""

full_path = os.path.join(self.rootdir, filename)

if not os.path.isdir(os.path.dirname(full_path)):

os.makedirs(os.path.dirname(full_path))

with open(full_path, mode) as f:

f.write(contents)

current_time = os.path.getmtime(full_path)

# Subtract a few years off the last modification date.

os.utime(full_path, (current_time, current_time - 100000000))

if mtime is not None:

os.utime(full_path, (mtime, mtime))

return full_path

def append_file(self, filename, contents):

"""Append contents to a file

``filename`` should be a relative path, e.g. "foo/bar/baz.txt"

It will be translated into a full path in a tmp dir.

Returns the full path to the file.

"""

full_path = os.path.join(self.rootdir, filename)

if not os.path.isdir(os.path.dirname(full_path)):

os.makedirs(os.path.dirname(full_path))

with open(full_path, 'a') as f:

f.write(contents)

return full_path

def full_path(self, filename):

"""Translate relative path to full path in temp dir.

f.full_path('foo/bar.txt') -> /tmp/asdfasd/foo/bar.txt

"""

return os.path.join(self.rootdir, filename)

class ProcessTerminatedError(Exception):

pass

class Result:

def __init__(self, rc, stdout, stderr, memory_usage=None):

self.rc = rc

self.stdout = stdout

self.stderr = stderr

INTEG_LOG.debug("rc: %s", rc)

INTEG_LOG.debug("stdout: %s", stdout)

INTEG_LOG.debug("stderr: %s", stderr)

if memory_usage is None:

memory_usage = []

self.memory_usage = memory_usage

@property

def json(self):

return json.loads(self.stdout)

def _escape_quotes(command):

# For windows we have different rules for escaping.

# First, double quotes must be escaped.

command = command.replace('"', '\\"')

# Second, single quotes do nothing, to quote a value we need

# to use double quotes.

command = command.replace("'", '"')

return command

def aws(

command,

collect_memory=False,

env_vars=None,

wait_for_finish=True,

input_data=None,

input_file=None,

):

"""Run an aws command.

This help function abstracts the differences of running the "aws"

command on different platforms.

If collect_memory is ``True`` the the Result object will have a list

of memory usage taken at 2 second intervals. The memory usage

will be in bytes.

If env_vars is None, this will set the environment variables

to be used by the aws process.

If wait_for_finish is False, then the Process object is returned

to the caller. It is then the caller's responsibility to ensure

proper cleanup. This can be useful if you want to test timeout's

or how the CLI responds to various signals.

:type input_data: string

:param input_data: This string will be communicated to the process through

the stdin of the process. It essentially allows the user to

avoid having to use a file handle to pass information to the process.

Note that this string is not passed on creation of the process, but

rather communicated to the process.

:type input_file: a file handle

:param input_file: This is a file handle that will act as the

the stdin of the process immediately on creation. Essentially

any data written to the file will be read from stdin of the

process. This is needed if you plan to stream data into stdin while

collecting memory.

"""

if platform.system() == 'Windows':

command = _escape_quotes(command)

if 'AWS_TEST_COMMAND' in os.environ:

aws_command = os.environ['AWS_TEST_COMMAND']

else:

aws_command = 'python %s' % get_aws_cmd()

full_command = '%s %s' % (aws_command, command)

stdout_encoding = get_stdout_encoding()

INTEG_LOG.debug("Running command: %s", full_command)

env = os.environ.copy()

if 'AWS_DEFAULT_REGION' not in env:

env['AWS_DEFAULT_REGION'] = "us-east-1"

if env_vars is not None:

env = env_vars

if input_file is None:

input_file = PIPE

process = Popen(

full_command,

stdout=PIPE,

stderr=PIPE,

stdin=input_file,

shell=True,

env=env,

)

if not wait_for_finish:

return process

memory = None

if not collect_memory:

kwargs = {}

if input_data:

kwargs = {'input': input_data}

stdout, stderr = process.communicate(**kwargs)

else:

stdout, stderr, memory = _wait_and_collect_mem(process)

return Result(

process.returncode,

stdout.decode(stdout_encoding),

stderr.decode(stdout_encoding),

memory,

)

def get_stdout_encoding():

encoding = getattr(sys.__stdout__, 'encoding', None)

if encoding is None:

encoding = 'utf-8'

return encoding

def _wait_and_collect_mem(process):

# We only know how to collect memory on mac/linux.

if platform.system() == 'Darwin':

get_memory = _get_memory_with_ps

elif platform.system() == 'Linux':

get_memory = _get_memory_with_ps

else:

raise ValueError(

f"Can't collect memory for process on platform {platform.system()}."

)

memory = []

while process.poll() is None:

try:

current = get_memory(process.pid)

except ProcessTerminatedError:

# It's possible the process terminated between .poll()

# and get_memory().

break

memory.append(current)

stdout, stderr = process.communicate()

return stdout, stderr, memory

def _get_memory_with_ps(pid):

# It's probably possible to do with proc_pidinfo and ctypes on a Mac,

# but we'll do it the easy way with parsing ps output.

command_list = 'ps u -p'.split()

command_list.append(str(pid))

p = Popen(command_list, stdout=PIPE)

stdout = p.communicate()[0]

if not p.returncode == 0:

raise ProcessTerminatedError(str(pid))

else:

# Get the RSS from output that looks like this:

# USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND

# user 47102 0.0 0.1 2437000 4496 s002 S+ 7:04PM 0:00.12 python2.6

return int(stdout.splitlines()[1].split()[5]) * 1024

class BaseS3CLICommand(unittest.TestCase):

"""Base class for aws s3 command.

This contains convenience functions to make writing these tests easier

and more streamlined.

"""

_PUT_HEAD_SHARED_EXTRAS = [

'SSECustomerAlgorithm',

'SSECustomerKey',

'SSECustomerKeyMD5',

'RequestPayer',

]

def setUp(self):

self.files = FileCreator()

self.session = botocore.session.get_session()

self.regions = {}

self.region = 'us-west-2'

self.client = create_nested_client(self.session, 's3', region_name=self.region)

self.extra_setup()

def extra_setup(self):

# Subclasses can use this to define extra setup steps.

pass

def tearDown(self):

self.files.remove_all()

self.extra_teardown()

def extra_teardown(self):

# Subclasses can use this to define extra teardown steps.

pass

def override_parser(self, **kwargs):

factory = self.session.get_component('response_parser_factory')

factory.set_parser_defaults(**kwargs)

def create_client_for_bucket(self, bucket_name):

region = self.regions.get(bucket_name, self.region)

client = create_nested_client(self.session, 's3', region_name=region)

return client

def assert_key_contents_equal(self, bucket, key, expected_contents):

self.wait_until_key_exists(bucket, key)

if isinstance(expected_contents, BytesIO):

expected_contents = expected_contents.getvalue().decode('utf-8')

actual_contents = self.get_key_contents(bucket, key)

# The contents can be huge so we try to give helpful error messages

# without necessarily printing the actual contents.

self.assertEqual(len(actual_contents), len(expected_contents))

if actual_contents != expected_contents:

self.fail(

f"Contents for {bucket}/{key} do not match (but they "

"have the same length)"

)

def delete_public_access_block(self, bucket_name):

client = self.create_client_for_bucket(bucket_name)

client.delete_public_access_block(Bucket=bucket_name)

def create_bucket(self, name=None, region=None):

if not region:

region = self.region

bucket_name = create_bucket(self.session, name, region)

self.regions[bucket_name] = region

self.addCleanup(self.delete_bucket, bucket_name)

# Wait for the bucket to exist before letting it be used.

self.wait_bucket_exists(bucket_name)

self.delete_public_access_block(bucket_name)

return bucket_name

def create_dir_bucket(self, name=None, location=None):

if location:

region, _ = location

else:

region = self.region

bucket_name = create_dir_bucket(self.session, name, location)

self.regions[bucket_name] = region

self.addCleanup(self.delete_bucket, bucket_name)

# Wait for the bucket to exist before letting it be used.

self.wait_bucket_exists(bucket_name)

return bucket_name

def put_object(self, bucket_name, key_name, contents='', extra_args=None):

client = self.create_client_for_bucket(bucket_name)

call_args = {'Bucket': bucket_name, 'Key': key_name, 'Body': contents}

if extra_args is not None:

call_args.update(extra_args)

response = client.put_object(**call_args)

self.addCleanup(self.delete_key, bucket_name, key_name)

extra_head_params = {}

if extra_args:

extra_head_params = dict(

(k, v)

for (k, v) in extra_args.items()

if k in self._PUT_HEAD_SHARED_EXTRAS

)

self.wait_until_key_exists(

bucket_name,

key_name,

extra_params=extra_head_params,

)

return response

def delete_bucket(self, bucket_name, attempts=5, delay=5):

self.remove_all_objects(bucket_name)

client = self.create_client_for_bucket(bucket_name)

# There's a chance that, even though the bucket has been used

# several times, the delete will fail due to eventual consistency

# issues.

attempts_remaining = attempts

while True:

attempts_remaining -= 1

try:

client.delete_bucket(Bucket=bucket_name)

break

except client.exceptions.NoSuchBucket:

if self.bucket_not_exists(bucket_name):

# Fast fail when the NoSuchBucket error is real.

break

if attempts_remaining <= 0:

raise

time.sleep(delay)

self.regions.pop(bucket_name, None)

def remove_all_objects(self, bucket_name):

client = self.create_client_for_bucket(bucket_name)

paginator = client.get_paginator('list_objects_v2')

pages = paginator.paginate(Bucket=bucket_name)

key_names = []

for page in pages:

key_names += [obj['Key'] for obj in page.get('Contents', [])]

for key_name in key_names:

self.delete_key(bucket_name, key_name)

def delete_key(self, bucket_name, key_name):

client = self.create_client_for_bucket(bucket_name)

response = client.delete_object(Bucket=bucket_name, Key=key_name)

def get_key_contents(self, bucket_name, key_name):

self.wait_until_key_exists(bucket_name, key_name)

client = self.create_client_for_bucket(bucket_name)

response = client.get_object(Bucket=bucket_name, Key=key_name)

return response['Body'].read().decode('utf-8')

def wait_bucket_exists(self, bucket_name, min_successes=3):

client = self.create_client_for_bucket(bucket_name)

waiter = client.get_waiter('bucket_exists')

consistency_waiter = ConsistencyWaiter(

min_successes=min_successes, delay_initial_poll=True

)

consistency_waiter.wait(

lambda: waiter.wait(Bucket=bucket_name) is None

)

def bucket_not_exists(self, bucket_name):

client = self.create_client_for_bucket(bucket_name)

try:

client.head_bucket(Bucket=bucket_name)

return True

except ClientError as error:

if error.response.get('Code') == '404':

return False

raise

def key_exists(self, bucket_name, key_name, min_successes=3):

try:

self.wait_until_key_exists(

bucket_name, key_name, min_successes=min_successes

)

return True

except (ClientError, WaiterError):

return False

def key_not_exists(self, bucket_name, key_name, min_successes=3):

try:

self.wait_until_key_not_exists(

bucket_name, key_name, min_successes=min_successes

)

return True

except (ClientError, WaiterError):

return False

def list_buckets(self):

response = self.client.list_buckets()

return response['Buckets']

def content_type_for_key(self, bucket_name, key_name):

parsed = self.head_object(bucket_name, key_name)

return parsed['ContentType']

def head_object(self, bucket_name, key_name):

client = self.create_client_for_bucket(bucket_name)

response = client.head_object(Bucket=bucket_name, Key=key_name)

return response

def wait_until_key_exists(

self, bucket_name, key_name, extra_params=None, min_successes=3

):

self._wait_for_key(

bucket_name, key_name, extra_params, min_successes, exists=True

)

def wait_until_key_not_exists(

self, bucket_name, key_name, extra_params=None, min_successes=3

):

self._wait_for_key(

bucket_name, key_name, extra_params, min_successes, exists=False

)

def _wait_for_key(

self,

bucket_name,

key_name,

extra_params=None,

min_successes=3,