sdk/python/tests/test_keep_client.py

   1 import hashlib
   2 import mock
   3 import os
   4 import random
   5 import re
   6 import socket
   7 import unittest
   8 import urlparse
   9
  10 import arvados
  11 import arvados.retry
  12 import arvados_testutil as tutil
  13 import run_test_server
  14
  15 class KeepTestCase(run_test_server.TestCaseWithServers):
  16     MAIN_SERVER = {}
  17     KEEP_SERVER = {}
  18
  19     @classmethod
  20     def setUpClass(cls):
  21         super(KeepTestCase, cls).setUpClass()
  22         run_test_server.authorize_with("admin")
  23         cls.api_client = arvados.api('v1')
  24         cls.keep_client = arvados.KeepClient(api_client=cls.api_client,
  25                                              proxy='', local_store='')
  26
  27     def test_KeepBasicRWTest(self):
  28         foo_locator = self.keep_client.put('foo')
  29         self.assertRegexpMatches(
  30             foo_locator,
  31             '^acbd18db4cc2f85cedef654fccc4a4d8\+3',
  32             'wrong md5 hash from Keep.put("foo"): ' + foo_locator)
  33         self.assertEqual(self.keep_client.get(foo_locator),
  34                          'foo',
  35                          'wrong content from Keep.get(md5("foo"))')
  36
  37     def test_KeepBinaryRWTest(self):
  38         blob_str = '\xff\xfe\xf7\x00\x01\x02'
  39         blob_locator = self.keep_client.put(blob_str)
  40         self.assertRegexpMatches(
  41             blob_locator,
  42             '^7fc7c53b45e53926ba52821140fef396\+6',
  43             ('wrong locator from Keep.put(<binarydata>):' + blob_locator))
  44         self.assertEqual(self.keep_client.get(blob_locator),
  45                          blob_str,
  46                          'wrong content from Keep.get(md5(<binarydata>))')
  47
  48     def test_KeepLongBinaryRWTest(self):
  49         blob_str = '\xff\xfe\xfd\xfc\x00\x01\x02\x03'
  50         for i in range(0,23):
  51             blob_str = blob_str + blob_str
  52         blob_locator = self.keep_client.put(blob_str)
  53         self.assertRegexpMatches(
  54             blob_locator,
  55             '^84d90fc0d8175dd5dcfab04b999bc956\+67108864',
  56             ('wrong locator from Keep.put(<binarydata>): ' + blob_locator))
  57         self.assertEqual(self.keep_client.get(blob_locator),
  58                          blob_str,
  59                          'wrong content from Keep.get(md5(<binarydata>))')
  60
  61     def test_KeepSingleCopyRWTest(self):
  62         blob_str = '\xff\xfe\xfd\xfc\x00\x01\x02\x03'
  63         blob_locator = self.keep_client.put(blob_str, copies=1)
  64         self.assertRegexpMatches(
  65             blob_locator,
  66             '^c902006bc98a3eb4a3663b65ab4a6fab\+8',
  67             ('wrong locator from Keep.put(<binarydata>): ' + blob_locator))
  68         self.assertEqual(self.keep_client.get(blob_locator),
  69                          blob_str,
  70                          'wrong content from Keep.get(md5(<binarydata>))')
  71
  72     def test_KeepEmptyCollectionTest(self):
  73         blob_locator = self.keep_client.put('', copies=1)
  74         self.assertRegexpMatches(
  75             blob_locator,
  76             '^d41d8cd98f00b204e9800998ecf8427e\+0',
  77             ('wrong locator from Keep.put(""): ' + blob_locator))
  78
  79     def test_unicode_must_be_ascii(self):
  80         # If unicode type, must only consist of valid ASCII
  81         foo_locator = self.keep_client.put(u'foo')
  82         self.assertRegexpMatches(
  83             foo_locator,
  84             '^acbd18db4cc2f85cedef654fccc4a4d8\+3',
  85             'wrong md5 hash from Keep.put("foo"): ' + foo_locator)
  86
  87         with self.assertRaises(UnicodeEncodeError):
  88             # Error if it is not ASCII
  89             self.keep_client.put(u'\xe2')
  90
  91         with self.assertRaises(arvados.errors.ArgumentError):
  92             # Must be a string type
  93             self.keep_client.put({})
  94
  95 class KeepPermissionTestCase(run_test_server.TestCaseWithServers):
  96     MAIN_SERVER = {}
  97     KEEP_SERVER = {'blob_signing_key': 'abcdefghijk0123456789',
  98                    'enforce_permissions': True}
  99
 100     def test_KeepBasicRWTest(self):
 101         run_test_server.authorize_with('active')
 102         keep_client = arvados.KeepClient()
 103         foo_locator = keep_client.put('foo')
 104         self.assertRegexpMatches(
 105             foo_locator,
 106             r'^acbd18db4cc2f85cedef654fccc4a4d8\+3\+A[a-f0-9]+@[a-f0-9]+$',
 107             'invalid locator from Keep.put("foo"): ' + foo_locator)
 108         self.assertEqual(keep_client.get(foo_locator),
 109                          'foo',
 110                          'wrong content from Keep.get(md5("foo"))')
 111
 112         # GET with an unsigned locator => NotFound
 113         bar_locator = keep_client.put('bar')
 114         unsigned_bar_locator = "37b51d194a7513e45b56f6524f2d51f2+3"
 115         self.assertRegexpMatches(
 116             bar_locator,
 117             r'^37b51d194a7513e45b56f6524f2d51f2\+3\+A[a-f0-9]+@[a-f0-9]+$',
 118             'invalid locator from Keep.put("bar"): ' + bar_locator)
 119         self.assertRaises(arvados.errors.NotFoundError,
 120                           keep_client.get,
 121                           unsigned_bar_locator)
 122
 123         # GET from a different user => NotFound
 124         run_test_server.authorize_with('spectator')
 125         self.assertRaises(arvados.errors.NotFoundError,
 126                           arvados.Keep.get,
 127                           bar_locator)
 128
 129         # Unauthenticated GET for a signed locator => NotFound
 130         # Unauthenticated GET for an unsigned locator => NotFound
 131         keep_client.api_token = ''
 132         self.assertRaises(arvados.errors.NotFoundError,
 133                           keep_client.get,
 134                           bar_locator)
 135         self.assertRaises(arvados.errors.NotFoundError,
 136                           keep_client.get,
 137                           unsigned_bar_locator)
 138
 139
 140 # KeepOptionalPermission: starts Keep with --permission-key-file
 141 # but not --enforce-permissions (i.e. generate signatures on PUT
 142 # requests, but do not require them for GET requests)
 143 #
 144 # All of these requests should succeed when permissions are optional:
 145 # * authenticated request, signed locator
 146 # * authenticated request, unsigned locator
 147 # * unauthenticated request, signed locator
 148 # * unauthenticated request, unsigned locator
 149 class KeepOptionalPermission(run_test_server.TestCaseWithServers):
 150     MAIN_SERVER = {}
 151     KEEP_SERVER = {'blob_signing_key': 'abcdefghijk0123456789',
 152                    'enforce_permissions': False}
 153
 154     @classmethod
 155     def setUpClass(cls):
 156         super(KeepOptionalPermission, cls).setUpClass()
 157         run_test_server.authorize_with("admin")
 158         cls.api_client = arvados.api('v1')
 159
 160     def setUp(self):
 161         super(KeepOptionalPermission, self).setUp()
 162         self.keep_client = arvados.KeepClient(api_client=self.api_client,
 163                                               proxy='', local_store='')
 164
 165     def _put_foo_and_check(self):
 166         signed_locator = self.keep_client.put('foo')
 167         self.assertRegexpMatches(
 168             signed_locator,
 169             r'^acbd18db4cc2f85cedef654fccc4a4d8\+3\+A[a-f0-9]+@[a-f0-9]+$',
 170             'invalid locator from Keep.put("foo"): ' + signed_locator)
 171         return signed_locator
 172
 173     def test_KeepAuthenticatedSignedTest(self):
 174         signed_locator = self._put_foo_and_check()
 175         self.assertEqual(self.keep_client.get(signed_locator),
 176                          'foo',
 177                          'wrong content from Keep.get(md5("foo"))')
 178
 179     def test_KeepAuthenticatedUnsignedTest(self):
 180         signed_locator = self._put_foo_and_check()
 181         self.assertEqual(self.keep_client.get("acbd18db4cc2f85cedef654fccc4a4d8"),
 182                          'foo',
 183                          'wrong content from Keep.get(md5("foo"))')
 184
 185     def test_KeepUnauthenticatedSignedTest(self):
 186         # Check that signed GET requests work even when permissions
 187         # enforcement is off.
 188         signed_locator = self._put_foo_and_check()
 189         self.keep_client.api_token = ''
 190         self.assertEqual(self.keep_client.get(signed_locator),
 191                          'foo',
 192                          'wrong content from Keep.get(md5("foo"))')
 193
 194     def test_KeepUnauthenticatedUnsignedTest(self):
 195         # Since --enforce-permissions is not in effect, GET requests
 196         # need not be authenticated.
 197         signed_locator = self._put_foo_and_check()
 198         self.keep_client.api_token = ''
 199         self.assertEqual(self.keep_client.get("acbd18db4cc2f85cedef654fccc4a4d8"),
 200                          'foo',
 201                          'wrong content from Keep.get(md5("foo"))')
 202
 203
 204 class KeepProxyTestCase(run_test_server.TestCaseWithServers):
 205     MAIN_SERVER = {}
 206     KEEP_SERVER = {}
 207     KEEP_PROXY_SERVER = {}
 208
 209     @classmethod
 210     def setUpClass(cls):
 211         super(KeepProxyTestCase, cls).setUpClass()
 212         run_test_server.authorize_with('active')
 213         cls.api_client = arvados.api('v1')
 214
 215     def tearDown(self):
 216         arvados.config.settings().pop('ARVADOS_EXTERNAL_CLIENT', None)
 217         super(KeepProxyTestCase, self).tearDown()
 218
 219     def test_KeepProxyTest1(self):
 220         # Will use ARVADOS_KEEP_PROXY environment variable that is set by
 221         # setUpClass().
 222         keep_client = arvados.KeepClient(api_client=self.api_client,
 223                                          local_store='')
 224         baz_locator = keep_client.put('baz')
 225         self.assertRegexpMatches(
 226             baz_locator,
 227             '^73feffa4b7f6bb68e44cf984c85f6e88\+3',
 228             'wrong md5 hash from Keep.put("baz"): ' + baz_locator)
 229         self.assertEqual(keep_client.get(baz_locator),
 230                          'baz',
 231                          'wrong content from Keep.get(md5("baz"))')
 232         self.assertTrue(keep_client.using_proxy)
 233
 234     def test_KeepProxyTest2(self):
 235         # Don't instantiate the proxy directly, but set the X-External-Client
 236         # header.  The API server should direct us to the proxy.
 237         arvados.config.settings()['ARVADOS_EXTERNAL_CLIENT'] = 'true'
 238         keep_client = arvados.KeepClient(api_client=self.api_client,
 239                                          proxy='', local_store='')
 240         baz_locator = keep_client.put('baz2')
 241         self.assertRegexpMatches(
 242             baz_locator,
 243             '^91f372a266fe2bf2823cb8ec7fda31ce\+4',
 244             'wrong md5 hash from Keep.put("baz2"): ' + baz_locator)
 245         self.assertEqual(keep_client.get(baz_locator),
 246                          'baz2',
 247                          'wrong content from Keep.get(md5("baz2"))')
 248         self.assertTrue(keep_client.using_proxy)
 249
 250
 251 class KeepClientServiceTestCase(unittest.TestCase, tutil.ApiClientMock):
 252     def get_service_roots(self, api_client):
 253         keep_client = arvados.KeepClient(api_client=api_client)
 254         services = keep_client.weighted_service_roots('000000')
 255         return [urlparse.urlparse(url) for url in sorted(services)]
 256
 257     def test_ssl_flag_respected_in_roots(self):
 258         for ssl_flag in [False, True]:
 259             services = self.get_service_roots(self.mock_keep_services(
 260                 service_ssl_flag=ssl_flag))
 261             self.assertEqual(
 262                 ('https' if ssl_flag else 'http'), services[0].scheme)
 263
 264     def test_correct_ports_with_ipv6_addresses(self):
 265         service = self.get_service_roots(self.mock_keep_services(
 266             service_type='proxy', service_host='100::1', service_port=10, count=1))[0]
 267         self.assertEqual('100::1', service.hostname)
 268         self.assertEqual(10, service.port)
 269
 270     # test_get_timeout and test_put_timeout test that
 271     # KeepClient.get and KeepClient.put use the appropriate timeouts
 272     # when connected directly to a Keep server (i.e. non-proxy timeout)
 273
 274     def test_get_timeout(self):
 275         api_client = self.mock_keep_services(count=1)
 276         force_timeout = [socket.timeout("timed out")]
 277         with tutil.mock_get(force_timeout) as mock_session:
 278             keep_client = arvados.KeepClient(api_client=api_client)
 279             with self.assertRaises(arvados.errors.KeepReadError):
 280                 keep_client.get('ffffffffffffffffffffffffffffffff')
 281             self.assertTrue(mock_session.return_value.get.called)
 282             self.assertEqual(
 283                 arvados.KeepClient.DEFAULT_TIMEOUT,
 284                 mock_session.return_value.get.call_args[1]['timeout'])
 285
 286     def test_put_timeout(self):
 287         api_client = self.mock_keep_services(count=1)
 288         force_timeout = [socket.timeout("timed out")]
 289         with tutil.mock_put(force_timeout) as mock_session:
 290             keep_client = arvados.KeepClient(api_client=api_client)
 291             with self.assertRaises(arvados.errors.KeepWriteError):
 292                 keep_client.put('foo')
 293             self.assertTrue(mock_session.return_value.put.called)
 294             self.assertEqual(
 295                 arvados.KeepClient.DEFAULT_TIMEOUT,
 296                 mock_session.return_value.put.call_args[1]['timeout'])
 297
 298     def test_proxy_get_timeout(self):
 299         # Force a timeout, verifying that the requests.get or
 300         # requests.put method was called with the proxy_timeout
 301         # setting rather than the default timeout.
 302         api_client = self.mock_keep_services(service_type='proxy', count=1)
 303         force_timeout = [socket.timeout("timed out")]
 304         with tutil.mock_get(force_timeout) as mock_session:
 305             keep_client = arvados.KeepClient(api_client=api_client)
 306             with self.assertRaises(arvados.errors.KeepReadError):
 307                 keep_client.get('ffffffffffffffffffffffffffffffff')
 308             self.assertTrue(mock_session.return_value.get.called)
 309             self.assertEqual(
 310                 arvados.KeepClient.DEFAULT_PROXY_TIMEOUT,
 311                 mock_session.return_value.get.call_args[1]['timeout'])
 312
 313     def test_proxy_put_timeout(self):
 314         # Force a timeout, verifying that the requests.get or
 315         # requests.put method was called with the proxy_timeout
 316         # setting rather than the default timeout.
 317         api_client = self.mock_keep_services(service_type='proxy', count=1)
 318         force_timeout = [socket.timeout("timed out")]
 319         with tutil.mock_put(force_timeout) as mock_session:
 320             keep_client = arvados.KeepClient(api_client=api_client)
 321             with self.assertRaises(arvados.errors.KeepWriteError):
 322                 keep_client.put('foo')
 323             self.assertTrue(mock_session.return_value.put.called)
 324             self.assertEqual(
 325                 arvados.KeepClient.DEFAULT_PROXY_TIMEOUT,
 326                 mock_session.return_value.put.call_args[1]['timeout'])
 327
 328     def test_probe_order_reference_set(self):
 329         # expected_order[i] is the probe order for
 330         # hash=md5(sprintf("%064x",i)) where there are 16 services
 331         # with uuid sprintf("anything-%015x",j) with j in 0..15. E.g.,
 332         # the first probe for the block consisting of 64 "0"
 333         # characters is the service whose uuid is
 334         # "zzzzz-bi6l4-000000000000003", so expected_order[0][0]=='3'.
 335         expected_order = [
 336             list('3eab2d5fc9681074'),
 337             list('097dba52e648f1c3'),
 338             list('c5b4e023f8a7d691'),
 339             list('9d81c02e76a3bf54'),
 340             ]
 341         hashes = [
 342             hashlib.md5("{:064x}".format(x)).hexdigest()
 343             for x in range(len(expected_order))]
 344         api_client = self.mock_keep_services(count=16)
 345         keep_client = arvados.KeepClient(api_client=api_client)
 346         for i, hash in enumerate(hashes):
 347             roots = keep_client.weighted_service_roots(hash)
 348             got_order = [
 349                 re.search(r'//\[?keep0x([0-9a-f]+)', root).group(1)
 350                 for root in roots]
 351             self.assertEqual(expected_order[i], got_order)
 352
 353     def test_probe_waste_adding_one_server(self):
 354         hashes = [
 355             hashlib.md5("{:064x}".format(x)).hexdigest() for x in range(100)]
 356         initial_services = 12
 357         api_client = self.mock_keep_services(count=initial_services)
 358         keep_client = arvados.KeepClient(api_client=api_client)
 359         probes_before = [
 360             keep_client.weighted_service_roots(hash) for hash in hashes]
 361         for added_services in range(1, 12):
 362             api_client = self.mock_keep_services(count=initial_services+added_services)
 363             keep_client = arvados.KeepClient(api_client=api_client)
 364             total_penalty = 0
 365             for hash_index in range(len(hashes)):
 366                 probe_after = keep_client.weighted_service_roots(
 367                     hashes[hash_index])
 368                 penalty = probe_after.index(probes_before[hash_index][0])
 369                 self.assertLessEqual(penalty, added_services)
 370                 total_penalty += penalty
 371             # Average penalty per block should not exceed
 372             # N(added)/N(orig) by more than 20%, and should get closer
 373             # to the ideal as we add data points.
 374             expect_penalty = (
 375                 added_services *
 376                 len(hashes) / initial_services)
 377             max_penalty = (
 378                 expect_penalty *
 379                 (120 - added_services)/100)
 380             min_penalty = (
 381                 expect_penalty * 8/10)
 382             self.assertTrue(
 383                 min_penalty <= total_penalty <= max_penalty,
 384                 "With {}+{} services, {} blocks, penalty {} but expected {}..{}".format(
 385                     initial_services,
 386                     added_services,
 387                     len(hashes),
 388                     total_penalty,
 389                     min_penalty,
 390                     max_penalty))
 391
 392     def check_64_zeros_error_order(self, verb, exc_class):
 393         data = '0' * 64
 394         if verb == 'get':
 395             data = hashlib.md5(data).hexdigest() + '+1234'
 396         # Arbitrary port number:
 397         aport = random.randint(1024,65535)
 398         api_client = self.mock_keep_services(service_port=aport, count=16)
 399         keep_client = arvados.KeepClient(api_client=api_client)
 400         with mock.patch('requests.' + verb,
 401                         side_effect=socket.timeout) as req_mock, \
 402                 self.assertRaises(exc_class) as err_check:
 403             getattr(keep_client, verb)(data)
 404         urls = [urlparse.urlparse(url)
 405                 for url in err_check.exception.request_errors()]
 406         self.assertEqual([('keep0x' + c, aport) for c in '3eab2d5fc9681074'],
 407                          [(url.hostname, url.port) for url in urls])
 408
 409     def test_get_error_shows_probe_order(self):
 410         self.check_64_zeros_error_order('get', arvados.errors.KeepReadError)
 411
 412     def test_put_error_shows_probe_order(self):
 413         self.check_64_zeros_error_order('put', arvados.errors.KeepWriteError)
 414
 415     def check_no_services_error(self, verb, exc_class):
 416         api_client = mock.MagicMock(name='api_client')
 417         api_client.keep_services().accessible().execute.side_effect = (
 418             arvados.errors.ApiError)
 419         keep_client = arvados.KeepClient(api_client=api_client)
 420         with self.assertRaises(exc_class) as err_check:
 421             getattr(keep_client, verb)('d41d8cd98f00b204e9800998ecf8427e+0')
 422         self.assertEqual(0, len(err_check.exception.request_errors()))
 423
 424     def test_get_error_with_no_services(self):
 425         self.check_no_services_error('get', arvados.errors.KeepReadError)
 426
 427     def test_put_error_with_no_services(self):
 428         self.check_no_services_error('put', arvados.errors.KeepWriteError)
 429
 430     def check_errors_from_last_retry(self, verb, exc_class):
 431         api_client = self.mock_keep_services(count=2)
 432         req_mock = getattr(tutil, 'mock_{}_responses'.format(verb))(
 433             "retry error reporting test", 500, 500, 403, 403)
 434         with req_mock, tutil.skip_sleep, \
 435                 self.assertRaises(exc_class) as err_check:
 436             keep_client = arvados.KeepClient(api_client=api_client)
 437             getattr(keep_client, verb)('d41d8cd98f00b204e9800998ecf8427e+0',
 438                                        num_retries=3)
 439         self.assertEqual([403, 403], [
 440                 getattr(error, 'status_code', None)
 441                 for error in err_check.exception.request_errors().itervalues()])
 442
 443     def test_get_error_reflects_last_retry(self):
 444         self.check_errors_from_last_retry('get', arvados.errors.KeepReadError)
 445
 446     def test_put_error_reflects_last_retry(self):
 447         self.check_errors_from_last_retry('put', arvados.errors.KeepWriteError)
 448
 449     def test_put_error_does_not_include_successful_puts(self):
 450         data = 'partial failure test'
 451         data_loc = '{}+{}'.format(hashlib.md5(data).hexdigest(), len(data))
 452         api_client = self.mock_keep_services(count=3)
 453         with tutil.mock_put_responses(data_loc, 200, 500, 500) as req_mock, \
 454                 self.assertRaises(arvados.errors.KeepWriteError) as exc_check:
 455             keep_client = arvados.KeepClient(api_client=api_client)
 456             keep_client.put(data)
 457         self.assertEqual(2, len(exc_check.exception.request_errors()))
 458
 459
 460 class KeepClientRetryTestMixin(object):
 461     # Testing with a local Keep store won't exercise the retry behavior.
 462     # Instead, our strategy is:
 463     # * Create a client with one proxy specified (pointed at a black
 464     #   hole), so there's no need to instantiate an API client, and
 465     #   all HTTP requests come from one place.
 466     # * Mock httplib's request method to provide simulated responses.
 467     # This lets us test the retry logic extensively without relying on any
 468     # supporting servers, and prevents side effects in case something hiccups.
 469     # To use this mixin, define DEFAULT_EXPECT, DEFAULT_EXCEPTION, and
 470     # run_method().
 471     #
 472     # Test classes must define TEST_PATCHER to a method that mocks
 473     # out appropriate methods in the client.
 474
 475     PROXY_ADDR = 'http://[%s]:65535/' % (tutil.TEST_HOST,)
 476     TEST_DATA = 'testdata'
 477     TEST_LOCATOR = 'ef654c40ab4f1747fc699915d4f70902+8'
 478
 479     def setUp(self):
 480         self.client_kwargs = {'proxy': self.PROXY_ADDR, 'local_store': ''}
 481
 482     def new_client(self, **caller_kwargs):
 483         kwargs = self.client_kwargs.copy()
 484         kwargs.update(caller_kwargs)
 485         return arvados.KeepClient(**kwargs)
 486
 487     def run_method(self, *args, **kwargs):
 488         raise NotImplementedError("test subclasses must define run_method")
 489
 490     def check_success(self, expected=None, *args, **kwargs):
 491         if expected is None:
 492             expected = self.DEFAULT_EXPECT
 493         self.assertEqual(expected, self.run_method(*args, **kwargs))
 494
 495     def check_exception(self, error_class=None, *args, **kwargs):
 496         if error_class is None:
 497             error_class = self.DEFAULT_EXCEPTION
 498         self.assertRaises(error_class, self.run_method, *args, **kwargs)
 499
 500     def test_immediate_success(self):
 501         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 200):
 502             self.check_success()
 503
 504     def test_retry_then_success(self):
 505         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 500, 200):
 506             self.check_success(num_retries=3)
 507
 508     def test_no_default_retry(self):
 509         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 500, 200):
 510             self.check_exception()
 511
 512     def test_no_retry_after_permanent_error(self):
 513         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 403, 200):
 514             self.check_exception(num_retries=3)
 515
 516     def test_error_after_retries_exhausted(self):
 517         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 500, 500, 200):
 518             self.check_exception(num_retries=1)
 519
 520     def test_num_retries_instance_fallback(self):
 521         self.client_kwargs['num_retries'] = 3
 522         with self.TEST_PATCHER(self.DEFAULT_EXPECT, 500, 200):
 523             self.check_success()
 524
 525
 526 @tutil.skip_sleep
 527 class KeepClientRetryGetTestCase(KeepClientRetryTestMixin, unittest.TestCase):
 528     DEFAULT_EXPECT = KeepClientRetryTestMixin.TEST_DATA
 529     DEFAULT_EXCEPTION = arvados.errors.KeepReadError
 530     HINTED_LOCATOR = KeepClientRetryTestMixin.TEST_LOCATOR + '+K@xyzzy'
 531     TEST_PATCHER = staticmethod(tutil.mock_get_responses)
 532
 533     def run_method(self, locator=KeepClientRetryTestMixin.TEST_LOCATOR,
 534                    *args, **kwargs):
 535         return self.new_client().get(locator, *args, **kwargs)
 536
 537     def test_specific_exception_when_not_found(self):
 538         with tutil.mock_get_responses(self.DEFAULT_EXPECT, 404, 200):
 539             self.check_exception(arvados.errors.NotFoundError, num_retries=3)
 540
 541     def test_general_exception_with_mixed_errors(self):
 542         # get should raise a NotFoundError if no server returns the block,
 543         # and a high threshold of servers report that it's not found.
 544         # This test rigs up 50/50 disagreement between two servers, and
 545         # checks that it does not become a NotFoundError.
 546         client = self.new_client()
 547         with tutil.mock_get_responses(self.DEFAULT_EXPECT, 404, 500):
 548             with self.assertRaises(arvados.errors.KeepReadError) as exc_check:
 549                 client.get(self.HINTED_LOCATOR)
 550             self.assertNotIsInstance(
 551                 exc_check.exception, arvados.errors.NotFoundError,
 552                 "mixed errors raised NotFoundError")
 553
 554     def test_hint_server_can_succeed_without_retries(self):
 555         with tutil.mock_get_responses(self.DEFAULT_EXPECT, 404, 200, 500):
 556             self.check_success(locator=self.HINTED_LOCATOR)
 557
 558     def test_try_next_server_after_timeout(self):
 559         with tutil.mock_get([
 560                 socket.timeout("timed out"),
 561                 tutil.fake_requests_response(200, self.DEFAULT_EXPECT)]):
 562             self.check_success(locator=self.HINTED_LOCATOR)
 563
 564     def test_retry_data_with_wrong_checksum(self):
 565         with tutil.mock_get((tutil.fake_requests_response(200, s) for s in ['baddata', self.TEST_DATA])):
 566             self.check_success(locator=self.HINTED_LOCATOR)
 567
 568
 569 @tutil.skip_sleep
 570 class KeepClientRetryPutTestCase(KeepClientRetryTestMixin, unittest.TestCase):
 571     DEFAULT_EXPECT = KeepClientRetryTestMixin.TEST_LOCATOR
 572     DEFAULT_EXCEPTION = arvados.errors.KeepWriteError
 573     TEST_PATCHER = staticmethod(tutil.mock_put_responses)
 574
 575     def run_method(self, data=KeepClientRetryTestMixin.TEST_DATA,
 576                    copies=1, *args, **kwargs):
 577         return self.new_client().put(data, copies, *args, **kwargs)
 578
 579     def test_do_not_send_multiple_copies_to_same_server(self):
 580         with tutil.mock_put_responses(self.DEFAULT_EXPECT, 200):
 581             self.check_exception(copies=2, num_retries=3)