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fix functional tests, add a few unit tests,

Browse source 
-add ‘generous’ parameter for NegotiatedPaymentRateManager to turn free
hosting on/off, by default set to true.
This commit is contained in:
Jack 2016-10-05 22:58:34 -04:00
parent dc2f0adb3e
commit 4f60a98eb2
14 changed files with 406 additions and 194 deletions
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2
lbrynet/conf.py
View file

@ -14,7 +14,7 @@ MAX_BLOB_INFOS_TO_REQUEST = 20
BLOBFILES_DIR = ".blobfiles"
BLOB_SIZE = 2**21
MIN_BLOB_DATA_PAYMENT_RATE = .001 # points/megabyte
MIN_BLOB_DATA_PAYMENT_RATE = .0001 # points/megabyte
MIN_BLOB_INFO_PAYMENT_RATE = .02 # points/1000 infos
MIN_VALUABLE_BLOB_INFO_PAYMENT_RATE = .05 # points/1000 infos
MIN_VALUABLE_BLOB_HASH_PAYMENT_RATE = .05 # points/1000 infos

13
lbrynet/core/BlobAvailability.py
View file

@ -3,6 +3,7 @@ import logging
from twisted.internet import defer
from twisted.internet.task import LoopingCall
from lbrynet.core.PeerFinder import DummyPeerFinder
from decimal import Decimal
log = logging.getLogger(__name__)
@ -17,7 +18,7 @@ class BlobAvailabilityTracker(object):
def __init__(self, blob_manager, peer_finder, dht_node):
self.availability = {}
self.last_mean_availability = 0.0
self.last_mean_availability = Decimal(0.0)
self._blob_manager = blob_manager
self._peer_finder = peer_finder
self._dht_node = dht_node
@ -85,7 +86,7 @@ class BlobAvailabilityTracker(object):
def _get_mean_peers(self):
num_peers = [len(self.availability[blob]) for blob in self.availability]
mean = float(sum(num_peers)) / float(max(1, len(num_peers)))
mean = Decimal(sum(num_peers)) / Decimal(max(1, len(num_peers)))
self.last_mean_availability = mean
@ -97,7 +98,7 @@ class DummyBlobAvailabilityTracker(BlobAvailabilityTracker):
availability (dict): dictionary of peers for known blobs
"""
def __init__(self):
def __init__(self, blob_manager=None, peer_finder=None, dht_node=None):
self.availability = {
'91dc64cf1ff42e20d627b033ad5e4c3a4a96856ed8a6e3fb4cd5fa1cfba4bf72eefd325f579db92f45f4355550ace8e7': ['1.2.3.4'],
'b2e48bb4c88cf46b76adf0d47a72389fae0cd1f19ed27dc509138c99509a25423a4cef788d571dca7988e1dca69e6fa0': ['1.2.3.4', '1.2.3.4'],
@ -110,10 +111,10 @@ class DummyBlobAvailabilityTracker(BlobAvailabilityTracker):
'f99d24cd50d4bfd77c2598bfbeeb8415bf0feef21200bdf0b8fbbde7751a77b7a2c68e09c25465a2f40fba8eecb0b4e0': ['1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4'],
'c84aa1fd8f5009f7c4e71e444e40d95610abc1480834f835eefb267287aeb10025880a3ce22580db8c6d92efb5bc0c9c': ['1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4', '1.2.3.4'],
}
self.last_mean_availability = 0.0
self._blob_manager = None
self.last_mean_availability = Decimal(0.0)
self._blob_manager = blob_manager
self._peer_finder = DummyPeerFinder()
self._dht_node = None
self._dht_node = dht_node
self._check_popular = None
self._check_mine = None
self._get_mean_peers()

28
lbrynet/core/Offer.py
View file

@ -1,4 +1,4 @@
from lbrynet.core.Error import NegotiationError
from decimal import Decimal
class Offer(object):
@ -13,13 +13,11 @@ class Offer(object):
def __init__(self, offer):
self._state = None
self.rate = None
if isinstance(offer, float):
if isinstance(offer, Decimal):
self.rate = round(offer, 5)
elif offer == Offer.RATE_ACCEPTED:
self.accept()
elif offer == Offer.RATE_TOO_LOW:
self.reject()
else:
elif isinstance(offer, float):
self.rate = round(Decimal(offer), 5)
if self.rate is None or self.rate < Decimal(0.0):
self.unset()
@property
@ -45,12 +43,22 @@ class Offer(object):
return None
def accept(self):
if self._state is None or self.is_unset:
if self.is_unset or self._state is None:
self._state = Offer.RATE_ACCEPTED
def reject(self):
if self._state is None or self.is_unset:
if self.is_unset or self._state is None:
self._state = Offer.RATE_TOO_LOW
def unset(self):
self._state = Offer.RATE_UNSET
self._state = Offer.RATE_UNSET
def handle(self, reply_message):
if reply_message == Offer.RATE_TOO_LOW:
self.reject()
elif reply_message == Offer.RATE_ACCEPTED:
self.accept()
elif reply_message == Offer.RATE_UNSET:
self.unset()
else:
raise Exception("Unknown offer reply %s" % str(reply_message))

22
lbrynet/core/PaymentRateManager.py
View file

@ -1,5 +1,6 @@
from lbrynet.core.Strategy import get_default_strategy
class BasePaymentRateManager(object):
def __init__(self, rate):
self.min_blob_data_payment_rate = rate
@ -32,7 +33,7 @@ class PaymentRateManager(object):
class NegotiatedPaymentRateManager(object):
def __init__(self, base, availability_tracker):
def __init__(self, base, availability_tracker, generous=True):
"""
@param base: a BasePaymentRateManager
@param availability_tracker: a BlobAvailabilityTracker
@ -43,15 +44,28 @@ class NegotiatedPaymentRateManager(object):
self.min_blob_data_payment_rate = self.base.min_blob_data_payment_rate
self.points_paid = 0.0
self.blob_tracker = availability_tracker
self.strategy = get_default_strategy(self.blob_tracker)
self.generous = generous
self.strategy = get_default_strategy(self.blob_tracker, base_price=self.min_blob_data_payment_rate, is_generous=generous)
def get_rate_blob_data(self, peer, blobs):
response = self.strategy.make_offer(peer, blobs)
return response.rate
def accept_rate_blob_data(self, peer, blobs, offer):
response = self.strategy.respond_to_offer(offer, peer, blobs)
return response.accepted
offer = self.strategy.respond_to_offer(offer, peer, blobs)
self.strategy.offer_accepted(peer, offer)
return offer.accepted
def reply_to_offer(self, peer, blobs, offer):
reply = self.strategy.respond_to_offer(offer, peer, blobs)
self.strategy.offer_accepted(peer, reply)
return reply
def get_rate_for_peer(self, peer):
return self.strategy.accepted_offers.get(peer, False)
def record_points_paid(self, amount):
self.points_paid += amount
def record_offer_reply(self, peer, offer):
self.strategy.offer_accepted(peer, offer)

9
lbrynet/core/PriceModel.py
View file

@ -1,4 +1,5 @@
from lbrynet.conf import MIN_BLOB_DATA_PAYMENT_RATE
from decimal import Decimal
def get_default_price_model(blob_tracker, **kwargs):
@ -19,14 +20,14 @@ class MeanAvailabilityWeightedPrice(object):
def __init__(self, tracker, base_price=MIN_BLOB_DATA_PAYMENT_RATE, alpha=1.0):
self.blob_tracker = tracker
self.base_price = base_price
self.alpha = alpha
self.base_price = Decimal(base_price)
self.alpha = Decimal(alpha)
def calculate_price(self, blob):
mean_availability = self.blob_tracker.last_mean_availability
availability = self.blob_tracker.availability.get(blob, [])
index = 0 # blob.index
price = self.base_price * (mean_availability / max(1, len(availability))) / self._frontload(index)
price = self.base_price * (mean_availability / Decimal(max(1, len(availability)))) / self._frontload(index)
return round(price, 5)
def _frontload(self, index):
@ -37,4 +38,4 @@ class MeanAvailabilityWeightedPrice(object):
@return: frontload multipler
"""
return 2.0 - (self.alpha ** index)
return Decimal(2.0) - (self.alpha ** index)

8
lbrynet/core/Session.py
View file

@ -29,7 +29,7 @@ class Session(object):
def __init__(self, blob_data_payment_rate, db_dir=None, lbryid=None, peer_manager=None, dht_node_port=None,
known_dht_nodes=None, peer_finder=None, hash_announcer=None,
blob_dir=None, blob_manager=None, peer_port=None, use_upnp=True,
rate_limiter=None, wallet=None, dht_node_class=node.Node, blob_tracker=None):
rate_limiter=None, wallet=None, dht_node_class=node.Node, blob_tracker_class=None):
"""
@param blob_data_payment_rate: The default payment rate for blob data
@ -88,7 +88,9 @@ class Session(object):
self.blob_dir = blob_dir
self.blob_manager = blob_manager
self.blob_tracker = blob_tracker
self.blob_tracker = None
self.blob_tracker_class = blob_tracker_class or BlobAvailabilityTracker
self.peer_port = peer_port
@ -261,7 +263,7 @@ class Session(object):
self.blob_manager = DiskBlobManager(self.hash_announcer, self.blob_dir, self.db_dir)
if self.blob_tracker is None:
self.blob_tracker = BlobAvailabilityTracker(self.blob_manager, self.peer_finder, self.dht_node)
self.blob_tracker = self.blob_tracker_class(self.blob_manager, self.peer_finder, self.dht_node)
if self.payment_rate_manager is None:
self.payment_rate_manager = NegotiatedPaymentRateManager(self.base_payment_rate_manager, self.blob_tracker)

180
lbrynet/core/Strategy.py
View file

@ -1,7 +1,8 @@
import logging
from decimal import Decimal
from lbrynet.conf import MIN_BLOB_DATA_PAYMENT_RATE
from lbrynet.core.Offer import Offer
from lbrynet.core.PriceModel import get_default_price_model
from lbrynet.core.PriceModel import MeanAvailabilityWeightedPrice
log = logging.getLogger(__name__)
@ -10,7 +11,90 @@ def get_default_strategy(blob_tracker, **kwargs):
return BasicAvailabilityWeightedStrategy(blob_tracker, **kwargs)
class BasicAvailabilityWeightedStrategy(object):
class BaseStrategy(object):
def __init__(self, price_model, max_rate, min_rate, is_generous=True):
self.price_model = price_model
self.is_generous = is_generous
self.accepted_offers = {}
self.offers_sent = {}
self.offers_received = {}
self.max_rate = max_rate or Decimal(self.price_model.base_price * 100)
self.min_rate = Decimal(min_rate)
def add_offer_sent(self, peer):
turn = self.offers_sent.get(peer, 0) + 1
self.offers_sent.update({peer: turn})
def add_offer_received(self, peer):
turn = self.offers_received.get(peer, 0) + 1
self.offers_received.update({peer: turn})
def calculate_price_target(self, *args):
return self.price_model.calculate_price(*args)
def bounded_price(self, price):
price_for_return = Decimal(min(self.max_rate, max(price, self.min_rate)))
return price_for_return
def make_offer(self, peer, blobs):
offer_count = self.offers_sent.get(peer, 0)
self.add_offer_sent(peer)
if peer in self.accepted_offers:
# if there was a previous accepted offer, use that
offer = self.accepted_offers[peer]
elif offer_count == 0 and self.is_generous:
# Try asking for it for free
offer = Offer(Decimal(0.0))
else:
rates = [self.calculate_price_target(blob) for blob in blobs]
price = self._make_offer(rates, offer_count)
bounded_price = self.bounded_price(price)
offer = Offer(bounded_price)
log.debug("Offering: %s", offer.rate)
return offer
def offer_accepted(self, peer, offer):
if not offer.accepted and peer in self.accepted_offers:
del self.accepted_offers[peer]
log.debug("Throwing out old accepted offer")
if offer.accepted:
self.accepted_offers.update({peer: offer})
log.debug("Updated accepted offer %f", offer.rate)
def respond_to_offer(self, offer, peer, blobs):
offer_count = self.offers_received.get(peer, 0)
self.add_offer_received(peer)
rates = [self.calculate_price_target(blob) for blob in blobs]
price = self._respond_to_offer(rates, offer_count)
bounded_price = self.bounded_price(price)
log.debug("Price target: %f", price)
if peer in self.accepted_offers:
offer = self.accepted_offers[peer]
log.debug("Already accepted %f", offer.rate)
elif offer.rate == 0.0 and offer_count == 0 and self.is_generous:
# give blobs away for free by default on the first request
offer.accept()
self.accepted_offers.update({peer: offer})
elif offer.rate >= bounded_price:
log.debug("Accept: %f", offer.rate)
offer.accept()
self.accepted_offers.update({peer: offer})
else:
log.debug("Reject: %f", offer.rate)
offer.reject()
if peer in self.accepted_offers:
del self.accepted_offers[peer]
return offer
def _make_offer(self, rates, offer_count):
return NotImplementedError()
def _respond_to_offer(self, rates, offer_count):
return NotImplementedError()
class BasicAvailabilityWeightedStrategy(BaseStrategy):
"""
Basic strategy to target blob prices based on supply relative to mean supply
@ -18,77 +102,29 @@ class BasicAvailabilityWeightedStrategy(object):
until the rate is accepted or a threshold is reached
"""
def __init__(self, blob_tracker, acceleration=1.25, deceleration=0.9, max_rate=0.005, min_rate=0.0, **kwargs):
self._acceleration = acceleration # rate of how quickly to ramp offer
self._deceleration = deceleration
self._min_rate = min_rate
self._max_rate = max_rate
self._count_up = {}
self._count_down = {}
self._requested = {}
self._offers_to_peers = {}
self.model = get_default_price_model(blob_tracker, **kwargs)
def __init__(self, blob_tracker, acceleration=1.25, deceleration=0.9, max_rate=None, min_rate=0.0,
is_generous=True, base_price=MIN_BLOB_DATA_PAYMENT_RATE, alpha=1.0):
price_model = MeanAvailabilityWeightedPrice(blob_tracker, base_price=base_price, alpha=alpha)
BaseStrategy.__init__(self, price_model, max_rate, min_rate, is_generous)
self._acceleration = Decimal(acceleration) # rate of how quickly to ramp offer
self._deceleration = Decimal(deceleration)
def respond_to_offer(self, offer, peer, blobs):
request_count = self._count_up.get(peer, 0)
rates = [self._calculate_price(blob) for blob in blobs]
rate = sum(rates) / max(len(rates), 1)
discounted = self._discount(rate, request_count)
price = self._bounded_price(discounted)
log.info("Price target: %f, final: %f", discounted, price)
self._inc_up_count(peer)
if offer.rate == 0.0 and request_count == 0:
# give blobs away for free by default on the first request
offer.accept()
return offer
elif offer.rate >= price:
log.info("Accept: %f", offer.rate)
offer.accept()
return offer
else:
log.info("Reject: %f", offer.rate)
offer.reject()
return offer
def make_offer(self, peer, blobs):
# use mean turn-discounted price for all the blobs requested
# if there was a previous offer replied to, use the same rate if it was accepted
last_offer = self._offers_to_peers.get(peer, False)
if last_offer:
if last_offer.rate is not None and last_offer.accepted:
return last_offer
request_count = self._count_down.get(peer, 0)
self._inc_down_count(peer)
if request_count == 0:
# Try asking for it for free
self._offers_to_peers.update({peer: Offer(0.0)})
else:
rates = [self._calculate_price(blob) for blob in blobs]
mean_rate = sum(rates) / max(len(blobs), 1)
with_premium = self._premium(mean_rate, request_count)
price = self._bounded_price(with_premium)
self._offers_to_peers.update({peer: Offer(price)})
return self._offers_to_peers[peer]
def _bounded_price(self, price):
price_for_return = min(self._max_rate, max(price, self._min_rate))
return price_for_return
def _inc_up_count(self, peer):
turn = self._count_up.get(peer, 0) + 1
self._count_up.update({peer: turn})
def _inc_down_count(self, peer):
turn = self._count_down.get(peer, 0) + 1
self._count_down.update({peer: turn})
def _calculate_price(self, blob):
return self.model.calculate_price(blob)
def _get_mean_rate(self, rates):
mean_rate = Decimal(sum(rates)) / Decimal(max(len(rates), 1))
return mean_rate
def _premium(self, rate, turn):
return rate * (self._acceleration ** turn)
return rate * (self._acceleration ** Decimal(turn))
def _discount(self, rate, turn):
return rate * (self._deceleration ** turn)
return rate * (self._deceleration ** Decimal(turn))
def _respond_to_offer(self, rates, offer_count):
rate = self._get_mean_rate(rates)
discounted = self._discount(rate, offer_count)
return round(discounted, 5)
def _make_offer(self, rates, offer_count):
rate = self._get_mean_rate(rates)
with_premium = self._premium(rate, offer_count)
return round(with_premium, 5)

18
lbrynet/core/client/BlobRequester.py
View file

@ -1,5 +1,6 @@
import logging
from collections import defaultdict
from decimal import Decimal
from twisted.internet import defer
from twisted.python.failure import Failure
@ -17,7 +18,12 @@ log = logging.getLogger(__name__)
def get_points(num_bytes, rate):
return 1.0 * num_bytes * rate / 2**20
if isinstance(rate, float):
return 1.0 * num_bytes * rate / 2**20
elif isinstance(rate, Decimal):
return 1.0 * num_bytes * float(rate) / 2**20
else:
raise Exception("Unknown rate type")
def cache(fn):
@ -356,18 +362,20 @@ class PriceRequest(RequestHelper):
if 'blob_data_payment_rate' not in response_dict:
return InvalidResponseError("response identifier not in response")
assert self.protocol in self.protocol_prices
response = Offer(response_dict['blob_data_payment_rate'])
rate = self.protocol_prices[self.protocol]
if response.accepted:
offer = Offer(rate)
offer.handle(response_dict['blob_data_payment_rate'])
self.payment_rate_manager.record_offer_reply(self.peer.host, offer)
if offer.accepted:
log.info("Offered rate %f/mb accepted by %s", rate, str(self.peer.host))
return True
elif response.too_low:
elif offer.too_low:
log.info("Offered rate %f/mb rejected by %s", rate, str(self.peer.host))
del self.protocol_prices[self.protocol]
return True
else:
log.warning("Price disagreement")
log.warning(rate)
del self.protocol_prices[self.protocol]
self.requestor._price_disagreements.append(self.peer)
return False

9
lbrynet/core/client/ClientProtocol.py
View file

@ -1,5 +1,6 @@
import json
import logging
from decimal import Decimal
from twisted.internet import error, defer
from twisted.internet.protocol import Protocol, ClientFactory
from twisted.python import failure
@ -14,6 +15,12 @@ from zope.interface import implements
log = logging.getLogger(__name__)
def encode_decimal(obj):
if isinstance(obj, Decimal):
return float(obj)
raise TypeError(repr(obj) + " is not JSON serializable")
class ClientProtocol(Protocol):
implements(IRequestSender, IRateLimited)
@ -132,7 +139,7 @@ class ClientProtocol(Protocol):
def _send_request_message(self, request_msg):
# TODO: compare this message to the last one. If they're the same,
# TODO: incrementally delay this message.
m = json.dumps(request_msg)
m = json.dumps(request_msg, default=encode_decimal)
self.transport.write(m)
def _get_valid_response(self, response_msg):

79
lbrynet/core/server/BlobRequestHandler.py
View file

@ -61,53 +61,20 @@ class BlobRequestHandler(object):
def handle_queries(self, queries):
response = defer.succeed({})
log.debug("Handle query: %s", str(queries))
if self.AVAILABILITY_QUERY in queries:
self._blobs_requested = queries[self.AVAILABILITY_QUERY]
response.addCallback(lambda r: self._reply_to_availability(r, self._blobs_requested))
if self.PAYMENT_RATE_QUERY in queries:
offer = Offer(queries[self.PAYMENT_RATE_QUERY])
offered_rate = queries[self.PAYMENT_RATE_QUERY]
offer = Offer(offered_rate)
response.addCallback(lambda r: self._handle_payment_rate_query(offer, r))
if self.BLOB_QUERY in queries:
if self.PAYMENT_RATE_QUERY in queries:
incoming = queries[self.BLOB_QUERY]
response.addCallback(lambda r: self._reply_to_send_request(r, incoming))
else:
response.addCallback(lambda _: {'incoming_blob': {'error': 'RATE_UNSET'}})
incoming = queries[self.BLOB_QUERY]
response.addCallback(lambda r: self._reply_to_send_request(r, incoming))
return response
def _handle_payment_rate_query(self, offer, request):
blobs = request.get("available_blobs", [])
log.info("Offered rate %f/mb for %i blobs", offer.rate, len(blobs))
accepted = self.payment_rate_manager.accept_rate_blob_data(self.peer, blobs, offer)
if offer.accepted:
self.blob_data_payment_rate = offer.rate
request[self.PAYMENT_RATE_QUERY] = "RATE_ACCEPTED"
elif offer.too_low:
request[self.PAYMENT_RATE_QUERY] = "RATE_TOO_LOW"
offer.unset()
elif offer.is_unset:
request['incoming_blob'] = {'error': 'RATE_UNSET'}
return request
def _handle_blob_query(self, response, query):
log.debug("Received the client's request to send a blob")
response['incoming_blob'] = {}
if self.blob_data_payment_rate is None:
response['incoming_blob'] = {'error': "RATE_UNSET"}
return response
else:
return self._send_blob(response, query)
def _send_blob(self, response, query):
d = self.blob_manager.get_blob(query, True)
d.addCallback(self.open_blob_for_reading, response)
return d
def open_blob_for_reading(self, blob, response):
def failure(msg):
log.debug("We can not send %s: %s", blob, msg)
@ -153,6 +120,39 @@ class BlobRequestHandler(object):
d.addCallback(set_available)
return d
def _handle_payment_rate_query(self, offer, request):
blobs = self._blobs_requested
log.info("Offered rate %f LBC/mb for %i blobs", offer.rate, len(blobs))
reply = self.payment_rate_manager.reply_to_offer(self.peer, blobs, offer)
if reply.accepted:
self.blob_data_payment_rate = offer.rate
request[self.PAYMENT_RATE_QUERY] = "RATE_ACCEPTED"
log.info("Accepted rate: %f", offer.rate)
elif reply.too_low:
request[self.PAYMENT_RATE_QUERY] = "RATE_TOO_LOW"
log.info("Reject rate: %f", offer.rate)
elif reply.is_unset:
log.warning("Rate unset")
request['incoming_blob'] = {'error': 'RATE_UNSET'}
log.debug("Returning rate query result: %s", str(request))
return request
def _handle_blob_query(self, response, query):
log.debug("Received the client's request to send a blob")
response['incoming_blob'] = {}
if self.blob_data_payment_rate is None:
response['incoming_blob'] = {'error': "RATE_UNSET"}
return response
else:
return self._send_blob(response, query)
def _send_blob(self, response, query):
d = self.blob_manager.get_blob(query, True)
d.addCallback(self.open_blob_for_reading, response)
return d
def open_blob_for_reading(self, blob, response):
response_fields = {}
d = defer.succeed(None)
@ -161,7 +161,7 @@ class BlobRequestHandler(object):
if read_handle is not None:
self.currently_uploading = blob
self.read_handle = read_handle
log.debug("Sending %s to client", str(blob))
log.info("Sending %s to client", str(blob))
response_fields['blob_hash'] = blob.blob_hash
response_fields['length'] = blob.length
response['incoming_blob'] = response_fields
@ -180,7 +180,6 @@ class BlobRequestHandler(object):
def _reply_to_send_request(self, response, incoming):
response_fields = {}
response['incoming_blob'] = response_fields
rate = self.blob_data_payment_rate
if self.blob_data_payment_rate is None:
log.debug("Rate not set yet")

4
lbrynet/lbrylive/client/LiveStreamDownloader.py
View file

@ -144,7 +144,7 @@ class FullLiveStreamDownloaderFactory(object):
def make_downloader(self, metadata, options, payment_rate_manager):
# TODO: check options for payment rate manager parameters
payment_rate_manager = LiveStreamPaymentRateManager(self.default_payment_rate_manager,
prm = LiveStreamPaymentRateManager(self.default_payment_rate_manager,
payment_rate_manager)
def save_source_if_blob(stream_hash):
@ -161,7 +161,7 @@ class FullLiveStreamDownloaderFactory(object):
def create_downloader(stream_hash):
stream_downloader = FullLiveStreamDownloader(stream_hash, self.peer_finder, self.rate_limiter,
self.blob_manager, self.stream_info_manager,
payment_rate_manager, self.wallet, True)
prm, self.wallet, True)
# TODO: change upload_allowed=True above to something better
d = stream_downloader.set_stream_info()
d.addCallback(lambda _: stream_downloader)

42
tests/functional/test_misc.py
View file

@ -234,14 +234,14 @@ def start_lbry_uploader(sd_hash_queue, kill_event, dead_event, file_size, ul_rat
hash_announcer = FakeAnnouncer()
rate_limiter = RateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "server"
os.mkdir(db_dir)
session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker,
dht_node_class=Node)
stream_info_manager = TempEncryptedFileMetadataManager()
@ -349,7 +349,6 @@ def start_lbry_reuploader(sd_hash, kill_event, dead_event, ready_event, n, ul_ra
hash_announcer = FakeAnnouncer()
rate_limiter = RateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "server_" + str(n)
blob_dir = os.path.join(db_dir, "blobfiles")
@ -359,7 +358,7 @@ def start_lbry_reuploader(sd_hash, kill_event, dead_event, ready_event, n, ul_ra
session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd" + str(n),
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=None, peer_port=peer_port,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
stream_info_manager = TempEncryptedFileMetadataManager()
@ -463,14 +462,14 @@ def start_live_server(sd_hash_queue, kill_event, dead_event):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "server"
os.mkdir(db_dir)
session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
base_payment_rate_manager = BaseLiveStreamPaymentRateManager(MIN_BLOB_INFO_PAYMENT_RATE)
data_payment_rate_manager = session.payment_rate_manager
@ -600,7 +599,6 @@ def start_blob_uploader(blob_hash_queue, kill_event, dead_event, slow):
peer_finder = FakePeerFinder(5553, peer_manager, 1)
hash_announcer = FakeAnnouncer()
rate_limiter = RateLimiter()
blob_tracker = DummyBlobAvailabilityTracker()
if slow is True:
peer_port = 5553
@ -615,7 +613,7 @@ def start_blob_uploader(blob_hash_queue, kill_event, dead_event, slow):
session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="efgh",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=peer_port,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
if slow is True:
session.rate_limiter.set_ul_limit(2**11)
@ -779,7 +777,7 @@ class TestTransfer(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
blob_dir = os.path.join(db_dir, "blobfiles")
@ -789,7 +787,7 @@ class TestTransfer(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker,
dht_node_class=Node)
self.stream_info_manager = TempEncryptedFileMetadataManager()
@ -868,7 +866,7 @@ class TestTransfer(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
os.mkdir(db_dir)
@ -876,7 +874,7 @@ class TestTransfer(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer, blob_dir=None,
peer_port=5553, use_upnp=False, rate_limiter=rate_limiter, wallet=wallet,
blob_tracker=blob_tracker, dht_node_class=Node)
blob_tracker_class=DummyBlobAvailabilityTracker, dht_node_class=Node)
self.stream_info_manager = TempLiveStreamMetadataManager(hash_announcer)
@ -973,7 +971,7 @@ class TestTransfer(TestCase):
peer_finder = FakePeerFinder(5553, peer_manager, 2)
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
blob_dir = os.path.join(db_dir, "blobfiles")
@ -983,7 +981,7 @@ class TestTransfer(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
d1 = self.wait_for_hash_from_queue(blob_hash_queue_1)
d2 = self.wait_for_hash_from_queue(blob_hash_queue_2)
@ -1052,7 +1050,7 @@ class TestTransfer(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
downloaders = []
@ -1064,7 +1062,7 @@ class TestTransfer(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=5553, use_upnp=False,
rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
self.stream_info_manager = DBEncryptedFileMetadataManager(self.session.db_dir)
@ -1171,7 +1169,7 @@ class TestTransfer(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
blob_dir = os.path.join(db_dir, "blobfiles")
@ -1181,7 +1179,7 @@ class TestTransfer(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=None, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
self.stream_info_manager = TempEncryptedFileMetadataManager()
@ -1290,7 +1288,7 @@ class TestStreamify(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
blob_dir = os.path.join(db_dir, "blobfiles")
@ -1300,7 +1298,7 @@ class TestStreamify(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
self.stream_info_manager = TempEncryptedFileMetadataManager()
@ -1343,7 +1341,7 @@ class TestStreamify(TestCase):
hash_announcer = FakeAnnouncer()
rate_limiter = DummyRateLimiter()
sd_identifier = StreamDescriptorIdentifier()
blob_tracker = DummyBlobAvailabilityTracker()
db_dir = "client"
blob_dir = os.path.join(db_dir, "blobfiles")
@ -1353,7 +1351,7 @@ class TestStreamify(TestCase):
self.session = Session(MIN_BLOB_DATA_PAYMENT_RATE, db_dir=db_dir, lbryid="abcd",
peer_finder=peer_finder, hash_announcer=hash_announcer,
blob_dir=blob_dir, peer_port=5553,
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker=blob_tracker)
use_upnp=False, rate_limiter=rate_limiter, wallet=wallet, blob_tracker_class=DummyBlobAvailabilityTracker)
self.stream_info_manager = DBEncryptedFileMetadataManager(self.session.db_dir)

3
tests/functional/test_reflector.py
View file

@ -61,7 +61,6 @@ class TestReflector(unittest.TestCase):
hash_announcer = mocks.Announcer()
rate_limiter = RateLimiter.DummyRateLimiter()
sd_identifier = StreamDescriptor.StreamDescriptorIdentifier()
blob_tracker = BlobAvailability.DummyBlobAvailabilityTracker()
self.expected_blobs = [
(
@ -95,7 +94,7 @@ class TestReflector(unittest.TestCase):
use_upnp=False,
rate_limiter=rate_limiter,
wallet=wallet,
blob_tracker=blob_tracker,
blob_tracker_class=BlobAvailability.DummyBlobAvailabilityTracker,
dht_node_class=Node
)

183
tests/unit/core/test_Strategy.py
View file

@ -1,8 +1,15 @@
from twisted.trial import unittest
import random
import mock
from lbrynet.core.PaymentRateManager import NegotiatedPaymentRateManager, BasePaymentRateManager
from lbrynet.core.Strategy import BasicAvailabilityWeightedStrategy
from lbrynet.core.Offer import Offer
from lbrynet.core.BlobAvailability import DummyBlobAvailabilityTracker
MAX_NEGOTIATION_TURNS = 10
def get_random_sample(list_to_sample):
result = list_to_sample[random.randint(1, len(list_to_sample)):random.randint(1, len(list_to_sample))]
if not result:
@ -11,25 +18,33 @@ def get_random_sample(list_to_sample):
class AvailabilityWeightedStrategyTests(unittest.TestCase):
def test_first_offer_is_zero_and_second_isnt(self):
def test_first_offer_is_zero_and_second_is_not_if_offer_not_accepted(self):
strategy = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker())
peer = "1.1.1.1"
blobs = strategy.model.blob_tracker.availability.keys()
blobs = strategy.price_model.blob_tracker.availability.keys()
offer1 = strategy.make_offer(peer, blobs)
offer2 = strategy.make_offer(peer, blobs)
self.assertEquals(offer1.rate, 0.0)
self.assertNotEqual(offer2.rate, 0.0)
def test_accept_zero_and_persist(self):
def test_accept_zero_and_persist_if_accepted(self):
host_strategy = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker())
client_strategy = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker())
client = "1.1.1.1"
host = "1.1.1.2"
blobs = host_strategy.model.blob_tracker.availability.keys()
client_strategy = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker())
blobs = host_strategy.price_model.blob_tracker.availability.keys()
offer = client_strategy.make_offer(host, blobs)
response1 = host_strategy.respond_to_offer(offer, client, blobs)
client_strategy.offer_accepted(host, response1)
offer = client_strategy.make_offer(host, blobs)
response2 = host_strategy.respond_to_offer(offer, client, blobs)
client_strategy.offer_accepted(host, response2)
self.assertEquals(response1.too_low, False)
self.assertEquals(response1.accepted, True)
@ -39,7 +54,7 @@ class AvailabilityWeightedStrategyTests(unittest.TestCase):
self.assertEquals(response2.accepted, True)
self.assertEquals(response2.rate, 0.0)
def test_turns_before_accept_with_similar_rate_settings(self):
def test_how_many_turns_before_accept_with_similar_rate_settings(self):
blobs = [
'b2e48bb4c88cf46b76adf0d47a72389fae0cd1f19ed27dc509138c99509a25423a4cef788d571dca7988e1dca69e6fa0',
'd7c82e6cac093b3f16107d2ae2b2c75424f1fcad2c7fbdbe66e4a13c0b6bd27b67b3a29c403b82279ab0f7c1c48d6787',
@ -52,19 +67,143 @@ class AvailabilityWeightedStrategyTests(unittest.TestCase):
'8c70d5e2f5c3a6085006198e5192d157a125d92e7378794472007a61947992768926513fc10924785bdb1761df3c37e6',
'c84aa1fd8f5009f7c4e71e444e40d95610abc1480834f835eefb267287aeb10025880a3ce22580db8c6d92efb5bc0c9c'
]
for x in range(10):
client_base = 0.001 * x
for y in range(10):
host_base = 0.001 * y
client_strat = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker(), base_price=client_base)
host_strat = BasicAvailabilityWeightedStrategy(DummyBlobAvailabilityTracker(), base_price=host_base)
for z in range(100):
blobs_to_query = get_random_sample(blobs)
accepted = False
turns = 0
while not accepted:
offer = client_strat.make_offer("2.3.4.5", blobs_to_query)
response = host_strat.respond_to_offer(offer, "3.4.5.6", blobs_to_query)
accepted = response.accepted
turns += 1
self.assertGreater(5, turns)
host = mock.Mock()
host.host = "1.2.3.4"
client = mock.Mock()
client.host = "1.2.3.5"
for x in range(1, 10):
for y in range(1, 10):
host_base = 0.0001 * y
client_base = 0.0001 * x
client_base_prm = BasePaymentRateManager(client_base)
client_prm = NegotiatedPaymentRateManager(client_base_prm, DummyBlobAvailabilityTracker(), generous=False)
host_base_prm = BasePaymentRateManager(host_base)
host_prm = NegotiatedPaymentRateManager(host_base_prm, DummyBlobAvailabilityTracker(), generous=False)
blobs_to_query = get_random_sample(blobs)
accepted = False
turns = 0
while not accepted:
rate = client_prm.get_rate_blob_data(host, blobs_to_query)
offer = Offer(rate)
accepted = host_prm.accept_rate_blob_data(client, blobs_to_query, offer)
turns += 1
self.assertGreater(MAX_NEGOTIATION_TURNS, turns)
def test_generous_connects_in_one_turn(self):
blobs = [
'b2e48bb4c88cf46b76adf0d47a72389fae0cd1f19ed27dc509138c99509a25423a4cef788d571dca7988e1dca69e6fa0',
'd7c82e6cac093b3f16107d2ae2b2c75424f1fcad2c7fbdbe66e4a13c0b6bd27b67b3a29c403b82279ab0f7c1c48d6787',
'5a450b416275da4bdff604ee7b58eaedc7913c5005b7184fc3bc5ef0b1add00613587f54217c91097fc039ed9eace9dd',
'f99d24cd50d4bfd77c2598bfbeeb8415bf0feef21200bdf0b8fbbde7751a77b7a2c68e09c25465a2f40fba8eecb0b4e0',
'9dbda74a472a2e5861a5d18197aeba0f5de67c67e401124c243d2f0f41edf01d7a26aeb0b5fc9bf47f6361e0f0968e2c',
'91dc64cf1ff42e20d627b033ad5e4c3a4a96856ed8a6e3fb4cd5fa1cfba4bf72eefd325f579db92f45f4355550ace8e7',
'6d8017aba362e5c5d0046625a039513419810a0397d728318c328a5cc5d96efb589fbca0728e54fe5adbf87e9545ee07',
'6af95cd062b4a179576997ef1054c9d2120f8592eea045e9667bea411d520262cd5a47b137eabb7a7871f5f8a79c92dd',
'8c70d5e2f5c3a6085006198e5192d157a125d92e7378794472007a61947992768926513fc10924785bdb1761df3c37e6',
'c84aa1fd8f5009f7c4e71e444e40d95610abc1480834f835eefb267287aeb10025880a3ce22580db8c6d92efb5bc0c9c'
]
host = mock.Mock()
host.host = "1.2.3.4"
client = mock.Mock()
client.host = "1.2.3.5"
for x in range(1, 10):
for y in range(1, 10):
host_base = 0.0001 * y
client_base = 0.0001 * x
client_base_prm = BasePaymentRateManager(client_base)
client_prm = NegotiatedPaymentRateManager(client_base_prm, DummyBlobAvailabilityTracker())
host_base_prm = BasePaymentRateManager(host_base)
host_prm = NegotiatedPaymentRateManager(host_base_prm, DummyBlobAvailabilityTracker())
blobs_to_query = get_random_sample(blobs)
accepted = False
turns = 0
while not accepted:
rate = client_prm.get_rate_blob_data(host, blobs_to_query)
offer = Offer(rate)
accepted = host_prm.accept_rate_blob_data(client, blobs_to_query, offer)
turns += 1
self.assertEqual(1, turns)
def test_how_many_turns_with_generous_client(self):
blobs = [
'b2e48bb4c88cf46b76adf0d47a72389fae0cd1f19ed27dc509138c99509a25423a4cef788d571dca7988e1dca69e6fa0',
'd7c82e6cac093b3f16107d2ae2b2c75424f1fcad2c7fbdbe66e4a13c0b6bd27b67b3a29c403b82279ab0f7c1c48d6787',
'5a450b416275da4bdff604ee7b58eaedc7913c5005b7184fc3bc5ef0b1add00613587f54217c91097fc039ed9eace9dd',
'f99d24cd50d4bfd77c2598bfbeeb8415bf0feef21200bdf0b8fbbde7751a77b7a2c68e09c25465a2f40fba8eecb0b4e0',
'9dbda74a472a2e5861a5d18197aeba0f5de67c67e401124c243d2f0f41edf01d7a26aeb0b5fc9bf47f6361e0f0968e2c',
'91dc64cf1ff42e20d627b033ad5e4c3a4a96856ed8a6e3fb4cd5fa1cfba4bf72eefd325f579db92f45f4355550ace8e7',
'6d8017aba362e5c5d0046625a039513419810a0397d728318c328a5cc5d96efb589fbca0728e54fe5adbf87e9545ee07',
'6af95cd062b4a179576997ef1054c9d2120f8592eea045e9667bea411d520262cd5a47b137eabb7a7871f5f8a79c92dd',
'8c70d5e2f5c3a6085006198e5192d157a125d92e7378794472007a61947992768926513fc10924785bdb1761df3c37e6',
'c84aa1fd8f5009f7c4e71e444e40d95610abc1480834f835eefb267287aeb10025880a3ce22580db8c6d92efb5bc0c9c'
]
host = mock.Mock()
host.host = "1.2.3.4"
client = mock.Mock()
client.host = "1.2.3.5"
for x in range(1, 10):
for y in range(1, 10):
host_base = 0.0001 * y
client_base = 0.0001 * x
client_base_prm = BasePaymentRateManager(client_base)
client_prm = NegotiatedPaymentRateManager(client_base_prm, DummyBlobAvailabilityTracker())
host_base_prm = BasePaymentRateManager(host_base)
host_prm = NegotiatedPaymentRateManager(host_base_prm, DummyBlobAvailabilityTracker(), generous=False)
blobs_to_query = get_random_sample(blobs)
accepted = False
turns = 0
while not accepted:
rate = client_prm.get_rate_blob_data(host, blobs_to_query)
offer = Offer(rate)
accepted = host_prm.accept_rate_blob_data(client, blobs_to_query, offer)
turns += 1
self.assertGreater(MAX_NEGOTIATION_TURNS, turns)
def test_how_many_turns_with_generous_host(self):
blobs = [
'b2e48bb4c88cf46b76adf0d47a72389fae0cd1f19ed27dc509138c99509a25423a4cef788d571dca7988e1dca69e6fa0',
'd7c82e6cac093b3f16107d2ae2b2c75424f1fcad2c7fbdbe66e4a13c0b6bd27b67b3a29c403b82279ab0f7c1c48d6787',
'5a450b416275da4bdff604ee7b58eaedc7913c5005b7184fc3bc5ef0b1add00613587f54217c91097fc039ed9eace9dd',
'f99d24cd50d4bfd77c2598bfbeeb8415bf0feef21200bdf0b8fbbde7751a77b7a2c68e09c25465a2f40fba8eecb0b4e0',
'9dbda74a472a2e5861a5d18197aeba0f5de67c67e401124c243d2f0f41edf01d7a26aeb0b5fc9bf47f6361e0f0968e2c',
'91dc64cf1ff42e20d627b033ad5e4c3a4a96856ed8a6e3fb4cd5fa1cfba4bf72eefd325f579db92f45f4355550ace8e7',
'6d8017aba362e5c5d0046625a039513419810a0397d728318c328a5cc5d96efb589fbca0728e54fe5adbf87e9545ee07',
'6af95cd062b4a179576997ef1054c9d2120f8592eea045e9667bea411d520262cd5a47b137eabb7a7871f5f8a79c92dd',
'8c70d5e2f5c3a6085006198e5192d157a125d92e7378794472007a61947992768926513fc10924785bdb1761df3c37e6',
'c84aa1fd8f5009f7c4e71e444e40d95610abc1480834f835eefb267287aeb10025880a3ce22580db8c6d92efb5bc0c9c'
]
host = mock.Mock()
host.host = "1.2.3.4"
client = mock.Mock()
client.host = "1.2.3.5"
for x in range(1, 10):
for y in range(1, 10):
host_base = 0.0001 * y
client_base = 0.0001 * x
client_base_prm = BasePaymentRateManager(client_base)
client_prm = NegotiatedPaymentRateManager(client_base_prm, DummyBlobAvailabilityTracker(), generous=False)
host_base_prm = BasePaymentRateManager(host_base)
host_prm = NegotiatedPaymentRateManager(host_base_prm, DummyBlobAvailabilityTracker())
blobs_to_query = get_random_sample(blobs)
accepted = False
turns = 0
while not accepted:
rate = client_prm.get_rate_blob_data(host, blobs_to_query)
offer = Offer(rate)
accepted = host_prm.accept_rate_blob_data(client, blobs_to_query, offer)
turns += 1
self.assertGreater(MAX_NEGOTIATION_TURNS, turns)