28 import arvados.config as config
30 import arvados.retry as retry
33 _logger = logging.getLogger('arvados.keep')
34 global_client_object = None
37 class KeepLocator(object):
38 EPOCH_DATETIME = datetime.datetime.utcfromtimestamp(0)
39 HINT_RE = re.compile(r'^[A-Z][A-Za-z0-9@_-]+$')
41 def __init__(self, locator_str):
44 self._perm_expiry = None
45 pieces = iter(locator_str.split('+'))
46 self.md5sum = next(pieces)
48 self.size = int(next(pieces))
52 if self.HINT_RE.match(hint) is None:
53 raise ValueError("invalid hint format: {}".format(hint))
54 elif hint.startswith('A'):
55 self.parse_permission_hint(hint)
57 self.hints.append(hint)
61 str(s) for s in [self.md5sum, self.size,
62 self.permission_hint()] + self.hints
66 if self.size is not None:
67 return "%s+%i" % (self.md5sum, self.size)
71 def _make_hex_prop(name, length):
72 # Build and return a new property with the given name that
73 # must be a hex string of the given length.
74 data_name = '_{}'.format(name)
76 return getattr(self, data_name)
77 def setter(self, hex_str):
78 if not arvados.util.is_hex(hex_str, length):
79 raise ValueError("{} must be a {}-digit hex string: {}".
80 format(name, length, hex_str))
81 setattr(self, data_name, hex_str)
82 return property(getter, setter)
84 md5sum = _make_hex_prop('md5sum', 32)
85 perm_sig = _make_hex_prop('perm_sig', 40)
88 def perm_expiry(self):
89 return self._perm_expiry
92 def perm_expiry(self, value):
93 if not arvados.util.is_hex(value, 1, 8):
95 "permission timestamp must be a hex Unix timestamp: {}".
97 self._perm_expiry = datetime.datetime.utcfromtimestamp(int(value, 16))
99 def permission_hint(self):
100 data = [self.perm_sig, self.perm_expiry]
103 data[1] = int((data[1] - self.EPOCH_DATETIME).total_seconds())
104 return "A{}@{:08x}".format(*data)
106 def parse_permission_hint(self, s):
108 self.perm_sig, self.perm_expiry = s[1:].split('@', 1)
110 raise ValueError("bad permission hint {}".format(s))
112 def permission_expired(self, as_of_dt=None):
113 if self.perm_expiry is None:
115 elif as_of_dt is None:
116 as_of_dt = datetime.datetime.now()
117 return self.perm_expiry <= as_of_dt
121 """Simple interface to a global KeepClient object.
123 THIS CLASS IS DEPRECATED. Please instantiate your own KeepClient with your
124 own API client. The global KeepClient will build an API client from the
125 current Arvados configuration, which may not match the one you built.
130 def global_client_object(cls):
131 global global_client_object
132 # Previously, KeepClient would change its behavior at runtime based
133 # on these configuration settings. We simulate that behavior here
134 # by checking the values and returning a new KeepClient if any of
136 key = (config.get('ARVADOS_API_HOST'),
137 config.get('ARVADOS_API_TOKEN'),
138 config.flag_is_true('ARVADOS_API_HOST_INSECURE'),
139 config.get('ARVADOS_KEEP_PROXY'),
140 config.get('ARVADOS_EXTERNAL_CLIENT') == 'true',
141 os.environ.get('KEEP_LOCAL_STORE'))
142 if (global_client_object is None) or (cls._last_key != key):
143 global_client_object = KeepClient()
145 return global_client_object
148 def get(locator, **kwargs):
149 return Keep.global_client_object().get(locator, **kwargs)
152 def put(data, **kwargs):
153 return Keep.global_client_object().put(data, **kwargs)
155 class KeepBlockCache(object):
156 # Default RAM cache is 256MiB
157 def __init__(self, cache_max=(256 * 1024 * 1024)):
158 self.cache_max = cache_max
160 self._cache_lock = threading.Lock()
162 class CacheSlot(object):
163 def __init__(self, locator):
164 self.locator = locator
165 self.ready = threading.Event()
172 def set(self, value):
177 if self.content is None:
180 return len(self.content)
183 '''Cap the cache size to self.cache_max'''
184 with self._cache_lock:
185 # Select all slots except those where ready.is_set() and content is
186 # None (that means there was an error reading the block).
187 self._cache = [c for c in self._cache if not (c.ready.is_set() and c.content is None)]
188 sm = sum([slot.size() for slot in self._cache])
189 while len(self._cache) > 0 and sm > self.cache_max:
190 for i in xrange(len(self._cache)-1, -1, -1):
191 if self._cache[i].ready.is_set():
194 sm = sum([slot.size() for slot in self._cache])
196 def _get(self, locator):
197 # Test if the locator is already in the cache
198 for i in xrange(0, len(self._cache)):
199 if self._cache[i].locator == locator:
202 # move it to the front
204 self._cache.insert(0, n)
208 def get(self, locator):
209 with self._cache_lock:
210 return self._get(locator)
212 def reserve_cache(self, locator):
213 '''Reserve a cache slot for the specified locator,
214 or return the existing slot.'''
215 with self._cache_lock:
216 n = self._get(locator)
220 # Add a new cache slot for the locator
221 n = KeepBlockCache.CacheSlot(locator)
222 self._cache.insert(0, n)
225 class KeepClient(object):
227 # Default Keep server connection timeout: 2 seconds
228 # Default Keep server read timeout: 300 seconds
229 # Default Keep proxy connection timeout: 20 seconds
230 # Default Keep proxy read timeout: 300 seconds
231 DEFAULT_TIMEOUT = (2, 300)
232 DEFAULT_PROXY_TIMEOUT = (20, 300)
234 class ThreadLimiter(object):
236 Limit the number of threads running at a given time to
237 {desired successes} minus {successes reported}. When successes
238 reported == desired, wake up the remaining threads and tell
241 Should be used in a "with" block.
243 def __init__(self, todo):
246 self._response = None
247 self._todo_lock = threading.Semaphore(todo)
248 self._done_lock = threading.Lock()
251 self._todo_lock.acquire()
254 def __exit__(self, type, value, traceback):
255 self._todo_lock.release()
257 def shall_i_proceed(self):
259 Return true if the current thread should do stuff. Return
260 false if the current thread should just stop.
262 with self._done_lock:
263 return (self._done < self._todo)
265 def save_response(self, response_body, replicas_stored):
267 Records a response body (a locator, possibly signed) returned by
268 the Keep server. It is not necessary to save more than
269 one response, since we presume that any locator returned
270 in response to a successful request is valid.
272 with self._done_lock:
273 self._done += replicas_stored
274 self._response = response_body
278 Returns the body from the response to a PUT request.
280 with self._done_lock:
281 return self._response
285 Return how many successes were reported.
287 with self._done_lock:
291 class KeepService(object):
292 """Make requests to a single Keep service, and track results.
294 A KeepService is intended to last long enough to perform one
295 transaction (GET or PUT) against one Keep service. This can
296 involve calling either get() or put() multiple times in order
297 to retry after transient failures. However, calling both get()
298 and put() on a single instance -- or using the same instance
299 to access two different Keep services -- will not produce
306 arvados.errors.HttpError,
309 def __init__(self, root, user_agent_pool=Queue.LifoQueue(), **headers):
311 self._user_agent_pool = user_agent_pool
312 self._result = {'error': None}
315 self.get_headers = {'Accept': 'application/octet-stream'}
316 self.get_headers.update(headers)
317 self.put_headers = headers
320 """Is it worth attempting a request?"""
324 """Did the request succeed or encounter permanent failure?"""
325 return self._result['error'] == False or not self._usable
327 def last_result(self):
330 def _get_user_agent(self):
332 return self._user_agent_pool.get(False)
336 def _put_user_agent(self, ua):
339 self._user_agent_pool.put(ua, False)
343 def _socket_open(self, family, socktype, protocol, address):
344 """Because pycurl doesn't have CURLOPT_TCP_KEEPALIVE"""
345 s = socket.socket(family, socktype, protocol)
346 s.setsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1)
347 s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, 75)
348 s.setsockopt(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, 75)
351 def get(self, locator, timeout=None):
352 # locator is a KeepLocator object.
353 url = self.root + str(locator)
354 _logger.debug("Request: GET %s", url)
355 curl = self._get_user_agent()
357 with timer.Timer() as t:
359 response_body = StringIO.StringIO()
360 curl.setopt(pycurl.NOSIGNAL, 1)
361 curl.setopt(pycurl.OPENSOCKETFUNCTION, self._socket_open)
362 curl.setopt(pycurl.URL, url.encode('utf-8'))
363 curl.setopt(pycurl.HTTPHEADER, [
364 '{}: {}'.format(k,v) for k,v in self.get_headers.iteritems()])
365 curl.setopt(pycurl.WRITEFUNCTION, response_body.write)
366 curl.setopt(pycurl.HEADERFUNCTION, self._headerfunction)
367 self._setcurltimeouts(curl, timeout)
370 except Exception as e:
371 raise arvados.errors.HttpError(0, str(e))
373 'status_code': curl.getinfo(pycurl.RESPONSE_CODE),
374 'body': response_body.getvalue(),
375 'headers': self._headers,
378 ok = retry.check_http_response_success(self._result['status_code'])
380 self._result['error'] = arvados.errors.HttpError(
381 self._result['status_code'],
382 self._headers.get('x-status-line', 'Error'))
383 except self.HTTP_ERRORS as e:
388 self._usable = ok != False
389 if self._result.get('status_code', None):
390 # The client worked well enough to get an HTTP status
391 # code, so presumably any problems are just on the
392 # server side and it's OK to reuse the client.
393 self._put_user_agent(curl)
395 # Don't return this client to the pool, in case it's
399 _logger.debug("Request fail: GET %s => %s: %s",
400 url, type(self._result['error']), str(self._result['error']))
402 _logger.info("%s response: %s bytes in %s msec (%.3f MiB/sec)",
403 self._result['status_code'],
404 len(self._result['body']),
406 (len(self._result['body'])/(1024.0*1024))/t.secs if t.secs > 0 else 0)
407 resp_md5 = hashlib.md5(self._result['body']).hexdigest()
408 if resp_md5 != locator.md5sum:
409 _logger.warning("Checksum fail: md5(%s) = %s",
411 self._result['error'] = arvados.errors.HttpError(
414 return self._result['body']
416 def put(self, hash_s, body, timeout=None):
417 url = self.root + hash_s
418 _logger.debug("Request: PUT %s", url)
419 curl = self._get_user_agent()
422 response_body = StringIO.StringIO()
423 curl.setopt(pycurl.NOSIGNAL, 1)
424 curl.setopt(pycurl.OPENSOCKETFUNCTION, self._socket_open)
425 curl.setopt(pycurl.URL, url.encode('utf-8'))
426 curl.setopt(pycurl.POSTFIELDS, body)
427 curl.setopt(pycurl.CUSTOMREQUEST, 'PUT')
428 curl.setopt(pycurl.HTTPHEADER, [
429 '{}: {}'.format(k,v) for k,v in self.put_headers.iteritems()])
430 curl.setopt(pycurl.WRITEFUNCTION, response_body.write)
431 curl.setopt(pycurl.HEADERFUNCTION, self._headerfunction)
432 self._setcurltimeouts(curl, timeout)
435 except Exception as e:
436 raise arvados.errors.HttpError(0, str(e))
438 'status_code': curl.getinfo(pycurl.RESPONSE_CODE),
439 'body': response_body.getvalue(),
440 'headers': self._headers,
443 ok = retry.check_http_response_success(self._result['status_code'])
445 self._result['error'] = arvados.errors.HttpError(
446 self._result['status_code'],
447 self._headers.get('x-status-line', 'Error'))
448 except self.HTTP_ERRORS as e:
453 self._usable = ok != False # still usable if ok is True or None
454 if self._result.get('status_code', None):
455 # Client is functional. See comment in get().
456 self._put_user_agent(curl)
460 _logger.debug("Request fail: PUT %s => %s: %s",
461 url, type(self._result['error']), str(self._result['error']))
465 def _setcurltimeouts(self, curl, timeouts):
468 elif isinstance(timeouts, tuple):
469 conn_t, xfer_t = timeouts
471 conn_t, xfer_t = (timeouts, timeouts)
472 curl.setopt(pycurl.CONNECTTIMEOUT_MS, int(conn_t*1000))
473 curl.setopt(pycurl.TIMEOUT_MS, int(xfer_t*1000))
475 def _headerfunction(self, header_line):
476 header_line = header_line.decode('iso-8859-1')
477 if ':' in header_line:
478 name, value = header_line.split(':', 1)
479 name = name.strip().lower()
480 value = value.strip()
482 name = self._lastheadername
483 value = self._headers[name] + ' ' + header_line.strip()
484 elif header_line.startswith('HTTP/'):
485 name = 'x-status-line'
488 _logger.error("Unexpected header line: %s", header_line)
490 self._lastheadername = name
491 self._headers[name] = value
492 # Returning None implies all bytes were written
495 class KeepWriterThread(threading.Thread):
497 Write a blob of data to the given Keep server. On success, call
498 save_response() of the given ThreadLimiter to save the returned
501 def __init__(self, keep_service, **kwargs):
502 super(KeepClient.KeepWriterThread, self).__init__()
503 self.service = keep_service
505 self._success = False
511 with self.args['thread_limiter'] as limiter:
512 if not limiter.shall_i_proceed():
513 # My turn arrived, but the job has been done without
516 self.run_with_limiter(limiter)
518 def run_with_limiter(self, limiter):
519 if self.service.finished():
521 _logger.debug("KeepWriterThread %s proceeding %s+%i %s",
522 str(threading.current_thread()),
523 self.args['data_hash'],
524 len(self.args['data']),
525 self.args['service_root'])
526 self._success = bool(self.service.put(
527 self.args['data_hash'],
529 timeout=self.args.get('timeout', None)))
530 result = self.service.last_result()
532 _logger.debug("KeepWriterThread %s succeeded %s+%i %s",
533 str(threading.current_thread()),
534 self.args['data_hash'],
535 len(self.args['data']),
536 self.args['service_root'])
537 # Tick the 'done' counter for the number of replica
538 # reported stored by the server, for the case that
539 # we're talking to a proxy or other backend that
540 # stores to multiple copies for us.
542 replicas_stored = int(result['headers']['x-keep-replicas-stored'])
543 except (KeyError, ValueError):
545 limiter.save_response(result['body'].strip(), replicas_stored)
546 elif result.get('status_code', None):
547 _logger.debug("Request fail: PUT %s => %s %s",
548 self.args['data_hash'],
549 result['status_code'],
553 def __init__(self, api_client=None, proxy=None,
554 timeout=DEFAULT_TIMEOUT, proxy_timeout=DEFAULT_PROXY_TIMEOUT,
555 api_token=None, local_store=None, block_cache=None,
556 num_retries=0, session=None):
557 """Initialize a new KeepClient.
561 The API client to use to find Keep services. If not
562 provided, KeepClient will build one from available Arvados
566 If specified, this KeepClient will send requests to this Keep
567 proxy. Otherwise, KeepClient will fall back to the setting of the
568 ARVADOS_KEEP_PROXY configuration setting. If you want to ensure
569 KeepClient does not use a proxy, pass in an empty string.
572 The initial timeout (in seconds) for HTTP requests to Keep
573 non-proxy servers. A tuple of two floats is interpreted as
574 (connection_timeout, read_timeout): see
575 http://docs.python-requests.org/en/latest/user/advanced/#timeouts.
576 Because timeouts are often a result of transient server load, the
577 actual connection timeout will be increased by a factor of two on
582 The initial timeout (in seconds) for HTTP requests to
583 Keep proxies. A tuple of two floats is interpreted as
584 (connection_timeout, read_timeout). The behavior described
585 above for adjusting connection timeouts on retry also applies.
589 If you're not using an API client, but only talking
590 directly to a Keep proxy, this parameter specifies an API token
591 to authenticate Keep requests. It is an error to specify both
592 api_client and api_token. If you specify neither, KeepClient
593 will use one available from the Arvados configuration.
596 If specified, this KeepClient will bypass Keep
597 services, and save data to the named directory. If unspecified,
598 KeepClient will fall back to the setting of the $KEEP_LOCAL_STORE
599 environment variable. If you want to ensure KeepClient does not
600 use local storage, pass in an empty string. This is primarily
601 intended to mock a server for testing.
604 The default number of times to retry failed requests.
605 This will be used as the default num_retries value when get() and
606 put() are called. Default 0.
608 self.lock = threading.Lock()
610 proxy = config.get('ARVADOS_KEEP_PROXY')
611 if api_token is None:
612 if api_client is None:
613 api_token = config.get('ARVADOS_API_TOKEN')
615 api_token = api_client.api_token
616 elif api_client is not None:
618 "can't build KeepClient with both API client and token")
619 if local_store is None:
620 local_store = os.environ.get('KEEP_LOCAL_STORE')
622 self.block_cache = block_cache if block_cache else KeepBlockCache()
623 self.timeout = timeout
624 self.proxy_timeout = proxy_timeout
625 self._user_agent_pool = Queue.LifoQueue()
628 self.local_store = local_store
629 self.get = self.local_store_get
630 self.put = self.local_store_put
632 self.num_retries = num_retries
634 if not proxy.endswith('/'):
636 self.api_token = api_token
637 self._gateway_services = {}
638 self._keep_services = [{
640 '_service_root': proxy,
642 self.using_proxy = True
643 self._static_services_list = True
645 # It's important to avoid instantiating an API client
646 # unless we actually need one, for testing's sake.
647 if api_client is None:
648 api_client = arvados.api('v1')
649 self.api_client = api_client
650 self.api_token = api_client.api_token
651 self._gateway_services = {}
652 self._keep_services = None
653 self.using_proxy = None
654 self._static_services_list = False
656 def current_timeout(self, attempt_number):
657 """Return the appropriate timeout to use for this client.
659 The proxy timeout setting if the backend service is currently a proxy,
660 the regular timeout setting otherwise. The `attempt_number` indicates
661 how many times the operation has been tried already (starting from 0
662 for the first try), and scales the connection timeout portion of the
663 return value accordingly.
666 # TODO(twp): the timeout should be a property of a
667 # KeepService, not a KeepClient. See #4488.
668 t = self.proxy_timeout if self.using_proxy else self.timeout
669 return (t[0] * (1 << attempt_number), t[1])
671 def build_services_list(self, force_rebuild=False):
672 if (self._static_services_list or
673 (self._keep_services and not force_rebuild)):
677 keep_services = self.api_client.keep_services().accessible()
678 except Exception: # API server predates Keep services.
679 keep_services = self.api_client.keep_disks().list()
681 accessible = keep_services.execute().get('items')
683 raise arvados.errors.NoKeepServersError()
685 # Precompute the base URI for each service.
687 host = r['service_host']
688 if not host.startswith('[') and host.find(':') >= 0:
689 # IPv6 URIs must be formatted like http://[::1]:80/...
690 host = '[' + host + ']'
691 r['_service_root'] = "{}://{}:{:d}/".format(
692 'https' if r['service_ssl_flag'] else 'http',
696 # Gateway services are only used when specified by UUID,
697 # so there's nothing to gain by filtering them by
699 self._gateway_services = {ks.get('uuid'): ks for ks in accessible}
700 _logger.debug(str(self._gateway_services))
702 self._keep_services = [
703 ks for ks in accessible
704 if ks.get('service_type') in ['disk', 'proxy']]
705 _logger.debug(str(self._keep_services))
707 self.using_proxy = any(ks.get('service_type') == 'proxy'
708 for ks in self._keep_services)
710 def _service_weight(self, data_hash, service_uuid):
711 """Compute the weight of a Keep service endpoint for a data
712 block with a known hash.
714 The weight is md5(h + u) where u is the last 15 characters of
715 the service endpoint's UUID.
717 return hashlib.md5(data_hash + service_uuid[-15:]).hexdigest()
719 def weighted_service_roots(self, locator, force_rebuild=False):
720 """Return an array of Keep service endpoints, in the order in
721 which they should be probed when reading or writing data with
722 the given hash+hints.
724 self.build_services_list(force_rebuild)
728 # Use the services indicated by the given +K@... remote
729 # service hints, if any are present and can be resolved to a
731 for hint in locator.hints:
732 if hint.startswith('K@'):
735 "https://keep.{}.arvadosapi.com/".format(hint[2:]))
736 elif len(hint) == 29:
737 svc = self._gateway_services.get(hint[2:])
739 sorted_roots.append(svc['_service_root'])
741 # Sort the available local services by weight (heaviest first)
742 # for this locator, and return their service_roots (base URIs)
744 sorted_roots.extend([
745 svc['_service_root'] for svc in sorted(
748 key=lambda svc: self._service_weight(locator.md5sum, svc['uuid']))])
749 _logger.debug("{}: {}".format(locator, sorted_roots))
752 def map_new_services(self, roots_map, locator, force_rebuild, **headers):
753 # roots_map is a dictionary, mapping Keep service root strings
754 # to KeepService objects. Poll for Keep services, and add any
755 # new ones to roots_map. Return the current list of local
757 headers.setdefault('Authorization', "OAuth2 %s" % (self.api_token,))
758 local_roots = self.weighted_service_roots(locator, force_rebuild)
759 for root in local_roots:
760 if root not in roots_map:
761 roots_map[root] = self.KeepService(
762 root, self._user_agent_pool, **headers)
766 def _check_loop_result(result):
767 # KeepClient RetryLoops should save results as a 2-tuple: the
768 # actual result of the request, and the number of servers available
769 # to receive the request this round.
770 # This method returns True if there's a real result, False if
771 # there are no more servers available, otherwise None.
772 if isinstance(result, Exception):
774 result, tried_server_count = result
775 if (result is not None) and (result is not False):
777 elif tried_server_count < 1:
778 _logger.info("No more Keep services to try; giving up")
783 def get_from_cache(self, loc):
784 """Fetch a block only if is in the cache, otherwise return None."""
785 slot = self.block_cache.get(loc)
786 if slot is not None and slot.ready.is_set():
792 def get(self, loc_s, num_retries=None):
793 """Get data from Keep.
795 This method fetches one or more blocks of data from Keep. It
796 sends a request each Keep service registered with the API
797 server (or the proxy provided when this client was
798 instantiated), then each service named in location hints, in
799 sequence. As soon as one service provides the data, it's
803 * loc_s: A string of one or more comma-separated locators to fetch.
804 This method returns the concatenation of these blocks.
805 * num_retries: The number of times to retry GET requests to
806 *each* Keep server if it returns temporary failures, with
807 exponential backoff. Note that, in each loop, the method may try
808 to fetch data from every available Keep service, along with any
809 that are named in location hints in the locator. The default value
810 is set when the KeepClient is initialized.
813 return ''.join(self.get(x) for x in loc_s.split(','))
814 locator = KeepLocator(loc_s)
815 slot, first = self.block_cache.reserve_cache(locator.md5sum)
820 # If the locator has hints specifying a prefix (indicating a
821 # remote keepproxy) or the UUID of a local gateway service,
822 # read data from the indicated service(s) instead of the usual
823 # list of local disk services.
824 hint_roots = ['http://keep.{}.arvadosapi.com/'.format(hint[2:])
825 for hint in locator.hints if hint.startswith('K@') and len(hint) == 7]
826 hint_roots.extend([self._gateway_services[hint[2:]]['_service_root']
827 for hint in locator.hints if (
828 hint.startswith('K@') and
830 self._gateway_services.get(hint[2:])
832 # Map root URLs to their KeepService objects.
834 root: self.KeepService(root, self._user_agent_pool)
835 for root in hint_roots
838 # See #3147 for a discussion of the loop implementation. Highlights:
839 # * Refresh the list of Keep services after each failure, in case
840 # it's being updated.
841 # * Retry until we succeed, we're out of retries, or every available
842 # service has returned permanent failure.
846 loop = retry.RetryLoop(num_retries, self._check_loop_result,
848 for tries_left in loop:
850 sorted_roots = self.map_new_services(
852 force_rebuild=(tries_left < num_retries))
853 except Exception as error:
854 loop.save_result(error)
857 # Query KeepService objects that haven't returned
858 # permanent failure, in our specified shuffle order.
859 services_to_try = [roots_map[root]
860 for root in sorted_roots
861 if roots_map[root].usable()]
862 for keep_service in services_to_try:
863 blob = keep_service.get(locator, timeout=self.current_timeout(num_retries-tries_left))
866 loop.save_result((blob, len(services_to_try)))
868 # Always cache the result, then return it if we succeeded.
870 self.block_cache.cap_cache()
874 # Q: Including 403 is necessary for the Keep tests to continue
875 # passing, but maybe they should expect KeepReadError instead?
876 not_founds = sum(1 for key in sorted_roots
877 if roots_map[key].last_result().get('status_code', None) in {403, 404, 410})
878 service_errors = ((key, roots_map[key].last_result()['error'])
879 for key in sorted_roots)
881 raise arvados.errors.KeepReadError(
882 "failed to read {}: no Keep services available ({})".format(
883 loc_s, loop.last_result()))
884 elif not_founds == len(sorted_roots):
885 raise arvados.errors.NotFoundError(
886 "{} not found".format(loc_s), service_errors)
888 raise arvados.errors.KeepReadError(
889 "failed to read {}".format(loc_s), service_errors, label="service")
892 def put(self, data, copies=2, num_retries=None):
893 """Save data in Keep.
895 This method will get a list of Keep services from the API server, and
896 send the data to each one simultaneously in a new thread. Once the
897 uploads are finished, if enough copies are saved, this method returns
898 the most recent HTTP response body. If requests fail to upload
899 enough copies, this method raises KeepWriteError.
902 * data: The string of data to upload.
903 * copies: The number of copies that the user requires be saved.
905 * num_retries: The number of times to retry PUT requests to
906 *each* Keep server if it returns temporary failures, with
907 exponential backoff. The default value is set when the
908 KeepClient is initialized.
911 if isinstance(data, unicode):
912 data = data.encode("ascii")
913 elif not isinstance(data, str):
914 raise arvados.errors.ArgumentError("Argument 'data' to KeepClient.put must be type 'str'")
916 data_hash = hashlib.md5(data).hexdigest()
919 locator = KeepLocator(data_hash + '+' + str(len(data)))
923 # Tell the proxy how many copies we want it to store
924 headers['X-Keep-Desired-Replication'] = str(copies)
926 thread_limiter = KeepClient.ThreadLimiter(copies)
927 loop = retry.RetryLoop(num_retries, self._check_loop_result,
929 for tries_left in loop:
931 local_roots = self.map_new_services(
933 force_rebuild=(tries_left < num_retries), **headers)
934 except Exception as error:
935 loop.save_result(error)
939 for service_root, ks in roots_map.iteritems():
942 t = KeepClient.KeepWriterThread(
946 service_root=service_root,
947 thread_limiter=thread_limiter,
948 timeout=self.current_timeout(num_retries-tries_left))
953 loop.save_result((thread_limiter.done() >= copies, len(threads)))
956 return thread_limiter.response()
958 raise arvados.errors.KeepWriteError(
959 "failed to write {}: no Keep services available ({})".format(
960 data_hash, loop.last_result()))
962 service_errors = ((key, roots_map[key].last_result()['error'])
963 for key in local_roots
964 if roots_map[key].last_result()['error'])
965 raise arvados.errors.KeepWriteError(
966 "failed to write {} (wanted {} copies but wrote {})".format(
967 data_hash, copies, thread_limiter.done()), service_errors, label="service")
969 def local_store_put(self, data, copies=1, num_retries=None):
972 This method is used in place of the real put() method when
973 using local storage (see constructor's local_store argument).
975 copies and num_retries arguments are ignored: they are here
976 only for the sake of offering the same call signature as
979 Data stored this way can be retrieved via local_store_get().
981 md5 = hashlib.md5(data).hexdigest()
982 locator = '%s+%d' % (md5, len(data))
983 with open(os.path.join(self.local_store, md5 + '.tmp'), 'w') as f:
985 os.rename(os.path.join(self.local_store, md5 + '.tmp'),
986 os.path.join(self.local_store, md5))
989 def local_store_get(self, loc_s, num_retries=None):
990 """Companion to local_store_put()."""
992 locator = KeepLocator(loc_s)
994 raise arvados.errors.NotFoundError(
995 "Invalid data locator: '%s'" % loc_s)
996 if locator.md5sum == config.EMPTY_BLOCK_LOCATOR.split('+')[0]:
998 with open(os.path.join(self.local_store, locator.md5sum), 'r') as f:
1001 def is_cached(self, locator):
1002 return self.block_cache.reserve_cache(expect_hash)