self.size = None
for hint in pieces:
if self.HINT_RE.match(hint) is None:
- raise ValueError("unrecognized hint data {}".format(hint))
+ raise ValueError("invalid hint format: {}".format(hint))
elif hint.startswith('A'):
self.parse_permission_hint(hint)
else:
if not proxy.endswith('/'):
proxy += '/'
self.api_token = api_token
+ self._gateway_services = {}
self._keep_services = [{
'uuid': 'proxy',
'_service_root': proxy,
api_client = arvados.api('v1')
self.api_client = api_client
self.api_token = api_client.api_token
+ self._gateway_services = {}
self._keep_services = None
self.using_proxy = None
self._static_services_list = False
except Exception: # API server predates Keep services.
keep_services = self.api_client.keep_disks().list()
- self._keep_services = keep_services.execute().get('items')
- if not self._keep_services:
+ accessible = keep_services.execute().get('items')
+ if not accessible:
raise arvados.errors.NoKeepServersError()
- self.using_proxy = any(ks.get('service_type') == 'proxy'
- for ks in self._keep_services)
-
# Precompute the base URI for each service.
- for r in self._keep_services:
+ for r in accessible:
r['_service_root'] = "{}://[{}]:{:d}/".format(
'https' if r['service_ssl_flag'] else 'http',
r['service_host'],
r['service_port'])
+
+ # Gateway services are only used when specified by UUID,
+ # so there's nothing to gain by filtering them by
+ # service_type.
+ self._gateway_services = {ks.get('uuid'): ks for ks in accessible}
+ _logger.debug(str(self._gateway_services))
+
+ self._keep_services = [
+ ks for ks in accessible
+ if ks.get('service_type') in ['disk', 'proxy']]
_logger.debug(str(self._keep_services))
+ self.using_proxy = any(ks.get('service_type') == 'proxy'
+ for ks in self._keep_services)
+
def _service_weight(self, data_hash, service_uuid):
"""Compute the weight of a Keep service endpoint for a data
block with a known hash.
"""
return hashlib.md5(data_hash + service_uuid[-15:]).hexdigest()
- def weighted_service_roots(self, data_hash, force_rebuild=False):
+ def weighted_service_roots(self, locator, force_rebuild=False):
"""Return an array of Keep service endpoints, in the order in
which they should be probed when reading or writing data with
- the given hash.
+ the given hash+hints.
"""
self.build_services_list(force_rebuild)
- # Sort the available services by weight (heaviest first) for
- # this data_hash, and return their service_roots (base URIs)
+ sorted_roots = []
+
+ # Use the services indicated by the given +K@... remote
+ # service hints, if any are present and can be resolved to a
+ # URI.
+ for hint in locator.hints:
+ if hint.startswith('K@'):
+ if len(hint) == 7:
+ sorted_roots.append(
+ "https://keep.{}.arvadosapi.com/".format(hint[2:]))
+ elif len(hint) == 29:
+ svc = self._gateway_services.get(hint[2:])
+ if svc:
+ sorted_roots.append(svc['_service_root'])
+
+ # Sort the available local services by weight (heaviest first)
+ # for this locator, and return their service_roots (base URIs)
# in that order.
- sorted_roots = [
+ sorted_roots.extend([
svc['_service_root'] for svc in sorted(
self._keep_services,
reverse=True,
- key=lambda svc: self._service_weight(data_hash, svc['uuid']))]
- _logger.debug(data_hash + ': ' + str(sorted_roots))
+ key=lambda svc: self._service_weight(locator.md5sum, svc['uuid']))])
+ _logger.debug("{}: {}".format(locator, sorted_roots))
return sorted_roots
- def map_new_services(self, roots_map, md5_s, force_rebuild, **headers):
+ def map_new_services(self, roots_map, locator, force_rebuild, **headers):
# roots_map is a dictionary, mapping Keep service root strings
# to KeepService objects. Poll for Keep services, and add any
# new ones to roots_map. Return the current list of local
# root strings.
headers.setdefault('Authorization', "OAuth2 %s" % (self.api_token,))
- local_roots = self.weighted_service_roots(md5_s, force_rebuild)
+ local_roots = self.weighted_service_roots(locator, force_rebuild)
for root in local_roots:
if root not in roots_map:
roots_map[root] = self.KeepService(root, self.session, **headers)
if ',' in loc_s:
return ''.join(self.get(x) for x in loc_s.split(','))
locator = KeepLocator(loc_s)
- expect_hash = locator.md5sum
- slot, first = self.block_cache.reserve_cache(expect_hash)
+ slot, first = self.block_cache.reserve_cache(locator.md5sum)
if not first:
v = slot.get()
return v
+ # If the locator has hints specifying a prefix (indicating a
+ # remote keepproxy) or the UUID of a local gateway service,
+ # read data from the indicated service(s) instead of the usual
+ # list of local disk services.
+ hint_roots = ['http://keep.{}.arvadosapi.com/'.format(hint[2:])
+ for hint in locator.hints if hint.startswith('K@') and len(hint) == 7]
+ hint_roots.extend([self._gateway_services[hint[2:]]['_service_root']
+ for hint in locator.hints if (
+ hint.startswith('K@') and
+ len(hint) == 29 and
+ self._gateway_services.get(hint[2:])
+ )])
+ # Map root URLs to their KeepService objects.
+ roots_map = {root: self.KeepService(root, self.session) for root in hint_roots}
+
# See #3147 for a discussion of the loop implementation. Highlights:
# * Refresh the list of Keep services after each failure, in case
# it's being updated.
# * Retry until we succeed, we're out of retries, or every available
# service has returned permanent failure.
- hint_roots = ['http://keep.{}.arvadosapi.com/'.format(hint[2:])
- for hint in locator.hints if hint.startswith('K@')]
- # Map root URLs their KeepService objects.
- roots_map = {root: self.KeepService(root, self.session) for root in hint_roots}
+ sorted_roots = []
+ roots_map = {}
blob = None
loop = retry.RetryLoop(num_retries, self._check_loop_result,
backoff_start=2)
for tries_left in loop:
try:
- local_roots = self.map_new_services(
- roots_map, expect_hash,
+ sorted_roots = self.map_new_services(
+ roots_map, locator,
force_rebuild=(tries_left < num_retries))
except Exception as error:
loop.save_result(error)
# Query KeepService objects that haven't returned
# permanent failure, in our specified shuffle order.
services_to_try = [roots_map[root]
- for root in (local_roots + hint_roots)
+ for root in sorted_roots
if roots_map[root].usable()]
for keep_service in services_to_try:
blob = keep_service.get(locator, timeout=self.current_timeout(num_retries-tries_left))
if loop.success():
return blob
- try:
- all_roots = local_roots + hint_roots
- except NameError:
- # We never successfully fetched local_roots.
- all_roots = hint_roots
# Q: Including 403 is necessary for the Keep tests to continue
# passing, but maybe they should expect KeepReadError instead?
- not_founds = sum(1 for key in all_roots
+ not_founds = sum(1 for key in sorted_roots
if roots_map[key].last_status() in {403, 404, 410})
service_errors = ((key, roots_map[key].last_result)
- for key in all_roots)
+ for key in sorted_roots)
if not roots_map:
raise arvados.errors.KeepReadError(
"failed to read {}: no Keep services available ({})".format(
loc_s, loop.last_result()))
- elif not_founds == len(all_roots):
+ elif not_founds == len(sorted_roots):
raise arvados.errors.NotFoundError(
"{} not found".format(loc_s), service_errors)
else:
data_hash = hashlib.md5(data).hexdigest()
if copies < 1:
return data_hash
+ locator = KeepLocator(data_hash + '+' + str(len(data)))
headers = {}
if self.using_proxy:
for tries_left in loop:
try:
local_roots = self.map_new_services(
- roots_map, data_hash,
+ roots_map, locator,
force_rebuild=(tries_left < num_retries), **headers)
except Exception as error:
loop.save_result(error)
projects / arvados.git / blobdiff