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Merge pull request #819 from lbryio/client_seek_head_blob_only

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Add option for clients to seek head blob first when downloading
This commit is contained in:
Umpei Kay Kurokawa 2017-08-28 07:48:07 -07:00 committed by GitHub
commit 009080ba69
5 changed files with 111 additions and 57 deletions
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1
CHANGELOG.md
View file

@ -14,6 +14,7 @@ at anytime.
### Added
* Added option to announce head blob only if seeding
* Adeed option to download by seeking head blob first
*
### Fixed

1
lbrynet/conf.py
View file

@ -255,6 +255,7 @@ ADJUSTABLE_SETTINGS = {
'known_dht_nodes': (list, DEFAULT_DHT_NODES, server_port),
'lbryum_wallet_dir': (str, default_lbryum_dir),
'max_connections_per_stream': (int, 5),
'seek_head_blob_first': (bool, False),
# TODO: writing json on the cmd line is a pain, come up with a nicer
# parser for this data structure. maybe 'USD:25'
'max_key_fee': (json.loads, {'currency': 'USD', 'amount': 50.0}),

55
lbrynet/core/client/BlobRequester.py
View file

@ -64,10 +64,24 @@ class BlobRequester(object):
return defer.succeed(False)
return self._send_next_request(peer, protocol)
def get_new_peers(self):
d = self._get_hash_for_peer_search()
d.addCallback(self._find_peers_for_hash)
return d
@defer.inlineCallbacks
def get_new_peers_for_head_blob(self):
""" look for peers for the head blob """
head_blob_hash = self._download_manager.get_head_blob_hash()
peers = yield self._find_peers_for_hash(head_blob_hash)
defer.returnValue(peers)
@defer.inlineCallbacks
def get_new_peers_for_next_unavailable(self):
"""
Look for peers for the next unavailable blob, if we have
all blobs, return an empty list
"""
blob_hash = yield self._get_hash_for_peer_search()
if blob_hash is None:
defer.returnValue([])
peers = yield self._find_peers_for_hash(blob_hash)
defer.returnValue(peers)
######### internal calls #########
def should_send_next_request(self, peer):
@ -103,6 +117,10 @@ class BlobRequester(object):
return defer.succeed(sent_request)
def _get_hash_for_peer_search(self):
"""
Get next unavailable hash for blob,
returns None if there is nothing left to download
"""
r = None
blobs_to_download = self._blobs_to_download()
if blobs_to_download:
@ -116,26 +134,23 @@ class BlobRequester(object):
return defer.succeed(r)
def _find_peers_for_hash(self, h):
if h is None:
return None
else:
d = self.peer_finder.find_peers_for_blob(h)
d = self.peer_finder.find_peers_for_blob(h)
def choose_best_peers(peers):
bad_peers = self._get_bad_peers()
without_bad_peers = [p for p in peers if not p in bad_peers]
without_maxed_out_peers = [
p for p in without_bad_peers if p not in self._maxed_out_peers]
return without_maxed_out_peers
def choose_best_peers(peers):
bad_peers = self._get_bad_peers()
without_bad_peers = [p for p in peers if not p in bad_peers]
without_maxed_out_peers = [
p for p in without_bad_peers if p not in self._maxed_out_peers]
return without_maxed_out_peers
d.addCallback(choose_best_peers)
d.addCallback(choose_best_peers)
def lookup_failed(err):
log.error("An error occurred looking up peers for a hash: %s", err.getTraceback())
return []
def lookup_failed(err):
log.error("An error occurred looking up peers for a hash: %s", err.getTraceback())
return []
d.addErrback(lookup_failed)
return d
d.addErrback(lookup_failed)
return d
def _should_send_request_to(self, peer):
if self._peers[peer] < -5.0:

67
lbrynet/core/client/ConnectionManager.py
View file

@ -25,6 +25,10 @@ class ConnectionManager(object):
def __init__(self, downloader, rate_limiter,
primary_request_creators, secondary_request_creators):
self.seek_head_blob_first = conf.settings['seek_head_blob_first']
self.max_connections_per_stream = conf.settings['max_connections_per_stream']
self.downloader = downloader
self.rate_limiter = rate_limiter
self._primary_request_creators = primary_request_creators
@ -146,14 +150,11 @@ class ConnectionManager(object):
@defer.inlineCallbacks
def manage(self, schedule_next_call=True):
self._manage_deferred = defer.Deferred()
if len(self._peer_connections) < conf.settings['max_connections_per_stream']:
if len(self._peer_connections) < self.max_connections_per_stream:
log.debug("%s have %d connections, looking for %d",
self._get_log_name(), len(self._peer_connections),
conf.settings['max_connections_per_stream'])
ordered_request_creators = self._rank_request_creator_connections()
peers = yield self._get_new_peers(ordered_request_creators)
new_conns = conf.settings['max_connections_per_stream'] - len(self._peer_connections)
peers = self._pick_best_peers(peers, new_conns)
self.max_connections_per_stream)
peers = yield self._get_new_peers()
for peer in peers:
self._connect_to_peer(peer)
self._manage_deferred.callback(None)
@ -161,46 +162,46 @@ class ConnectionManager(object):
if not self.stopped and schedule_next_call:
self._next_manage_call = utils.call_later(self.MANAGE_CALL_INTERVAL_SEC, self.manage)
def _rank_request_creator_connections(self):
"""Returns an ordered list of our request creators, ranked according
to which has the least number of connections open that it
likes
"""
def count_peers(request_creator):
return len([
p for p in self._peer_connections.itervalues()
if request_creator in p.request_creators])
return sorted(self._primary_request_creators, key=count_peers)
def return_shuffled_peers_not_connected_to(self, peers, new_conns_needed):
out = [peer for peer in peers if peer not in self._peer_connections]
random.shuffle(out)
return out[0:new_conns_needed]
@defer.inlineCallbacks
def _get_new_peers(self, request_creators):
def _get_new_peers(self):
new_conns_needed = self.max_connections_per_stream - len(self._peer_connections)
if new_conns_needed < 1:
defer.returnValue([])
# we always get the peer from the first request creator
# must be a type BlobRequester...
request_creator = self._primary_request_creators[0]
log.debug("%s Trying to get a new peer to connect to", self._get_log_name())
if not request_creators:
defer.returnValue(None)
new_peers = yield request_creators[0].get_new_peers()
if not new_peers:
new_peers = yield self._get_new_peers(request_creators[1:])
defer.returnValue(new_peers)
def _pick_best_peers(self, peers, num_peers_to_pick):
# TODO: Eventually rank them based on past performance/reputation. For now
# TODO: just pick the first to which we don't have an open connection
# find peers for the head blob if configured to do so
if self.seek_head_blob_first:
peers = yield request_creator.get_new_peers_for_head_blob()
peers = self.return_shuffled_peers_not_connected_to(peers, new_conns_needed)
else:
peers = []
# we didn't find any new peers on the head blob,
# we have to look for the first unavailable blob
if not peers:
peers = yield request_creator.get_new_peers_for_next_unavailable()
peers = self.return_shuffled_peers_not_connected_to(peers, new_conns_needed)
log.debug("%s Got a list of peers to choose from: %s",
self._get_log_name(), peers)
log.debug("%s Current connections: %s",
self._get_log_name(), self._peer_connections.keys())
log.debug("%s List of connection states: %s", self._get_log_name(),
[p_c_h.connection.state for p_c_h in self._peer_connections.values()])
if peers is None:
return []
out = [peer for peer in peers if peer not in self._peer_connections]
random.shuffle(out)
return out[0:num_peers_to_pick]
defer.returnValue(peers)
def _connect_to_peer(self, peer):
if peer is None or self.stopped:
if self.stopped:
return
log.debug("%s Trying to connect to %s", self._get_log_name(), peer)

44
tests/unit/core/client/test_ConnectionManager.py
View file

@ -30,8 +30,9 @@ class MocDownloader(object):
class MocRequestCreator(object):
implements(IRequestCreator)
def __init__(self, peers_to_return):
def __init__(self, peers_to_return, peers_to_return_head_blob=[]):
self.peers_to_return = peers_to_return
self.peers_to_return_head_blob = peers_to_return_head_blob
self.sent_request = False
def send_next_request(self, peer, protocol):
@ -53,9 +54,12 @@ class MocRequestCreator(object):
if isinstance(err.value, NoResponseError):
return err
def get_new_peers(self):
def get_new_peers_for_next_unavailable(self):
return self.peers_to_return
def get_new_peers_for_head_blob(self):
return self.peers_to_return_head_blob
class MocFunctionalQueryHandler(object):
implements(IQueryHandler)
@ -125,12 +129,15 @@ class TestIntegrationConnectionManager(unittest.TestCase):
self.primary_request_creator = MocRequestCreator([self.TEST_PEER])
self.clock = task.Clock()
utils.call_later = self.clock.callLater
self.server_port = None
def _init_connection_manager(self, seek_head_blob_first=False):
# this import is requierd here so utils.call_later is replaced by self.clock.callLater
from lbrynet.core.client.ConnectionManager import ConnectionManager
self.connection_manager = ConnectionManager(self.downloader, self.rate_limiter,
[self.primary_request_creator], [])
self.connection_manager.seek_head_blob_first = seek_head_blob_first
self.connection_manager._start()
self.server_port = None
def tearDown(self):
if self.server_port is not None:
@ -140,6 +147,7 @@ class TestIntegrationConnectionManager(unittest.TestCase):
@defer.inlineCallbacks
def test_success(self):
self._init_connection_manager()
# test to see that if we setup a server, we get a connection
self.server = MocServerProtocolFactory(self.clock)
self.server_port = reactor.listenTCP(PEER_PORT, self.server, interface=LOCAL_HOST)
@ -153,6 +161,7 @@ class TestIntegrationConnectionManager(unittest.TestCase):
@defer.inlineCallbacks
def test_server_with_improper_reply(self):
self._init_connection_manager()
self.server = MocServerProtocolFactory(self.clock, is_good=False)
self.server_port = reactor.listenTCP(PEER_PORT, self.server, interface=LOCAL_HOST)
yield self.connection_manager.manage(schedule_next_call=False)
@ -166,6 +175,8 @@ class TestIntegrationConnectionManager(unittest.TestCase):
@defer.inlineCallbacks
def test_non_existing_server(self):
# Test to see that if we don't setup a server, we don't get a connection
self._init_connection_manager()
yield self.connection_manager.manage(schedule_next_call=False)
self.assertEqual(1, self.connection_manager.num_peer_connections())
connection_made = yield self.connection_manager._peer_connections[self.TEST_PEER].factory.connection_was_made_deferred
@ -180,6 +191,8 @@ class TestIntegrationConnectionManager(unittest.TestCase):
def test_parallel_connections(self):
# Test to see that we make two new connections at a manage call,
# without it waiting for the connection to complete
self._init_connection_manager()
test_peer2 = Peer(LOCAL_HOST, PEER_PORT+1)
self.primary_request_creator.peers_to_return = [self.TEST_PEER, test_peer2]
yield self.connection_manager.manage(schedule_next_call=False)
@ -203,6 +216,7 @@ class TestIntegrationConnectionManager(unittest.TestCase):
# test to see that when we call stop, the ConnectionManager waits for the
# current manage call to finish, closes connections,
# and removes scheduled manage calls
self._init_connection_manager()
self.connection_manager.manage(schedule_next_call=True)
yield self.connection_manager.stop()
self.assertEqual(0, self.TEST_PEER.success_count)
@ -212,6 +226,7 @@ class TestIntegrationConnectionManager(unittest.TestCase):
@defer.inlineCallbacks
def test_closed_connection_when_server_is_slow(self):
self._init_connection_manager()
self.server = MocServerProtocolFactory(self.clock, has_moc_query_handler=True,is_delayed=True)
self.server_port = reactor.listenTCP(PEER_PORT, self.server, interface=LOCAL_HOST)
@ -224,3 +239,24 @@ class TestIntegrationConnectionManager(unittest.TestCase):
self.assertEqual(1, self.TEST_PEER.down_count)
""" test header first seeks """
@defer.inlineCallbacks
def test_no_peer_for_head_blob(self):
# test that if we can't find blobs for the head blob,
# it looks at the next unavailable and makes connection
self._init_connection_manager(seek_head_blob_first=True)
self.server = MocServerProtocolFactory(self.clock)
self.server_port = reactor.listenTCP(PEER_PORT, self.server, interface=LOCAL_HOST)
self.primary_request_creator.peers_to_return_head_blob = []
self.primary_request_creator.peers_to_return = [self.TEST_PEER]
yield self.connection_manager.manage(schedule_next_call=False)
self.assertEqual(1, self.connection_manager.num_peer_connections())
connection_made = yield self.connection_manager._peer_connections[self.TEST_PEER].factory.connection_was_made_deferred
self.assertEqual(0, self.connection_manager.num_peer_connections())
self.assertTrue(connection_made)
self.assertEqual(1, self.TEST_PEER.success_count)
self.assertEqual(0, self.TEST_PEER.down_count)