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cleanup downloader code

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This commit is contained in:
Victor Shyba 2019-05-01 18:04:45 -03:00
parent e43b29fcd1
commit 609cf42868
1 changed files with 10 additions and 32 deletions
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42
lbrynet/blob_exchange/downloader.py
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@ -31,12 +31,6 @@ class BlobDownloader:
def should_race_continue(self, blob: 'AbstractBlob'):
if len(self.active_connections) >= self.config.max_connections_per_download:
return False
# if a peer won 3 or more blob races and is active as a downloader, stop the race so bandwidth improves
# the safe net side is that any failure will reset the peer score, triggering the race back
# TODO: this is a good idea for low bandwidth, but doesnt play nice on high bandwidth
# for peer, task in self.active_connections.items():
# if self.scores.get(peer, 0) >= 0 and self.rounds_won.get(peer, 0) >= 3 and not task.done():
# return False
return not (blob.get_is_verified() or not blob.is_writeable())
async def request_blob_from_peer(self, blob: 'AbstractBlob', peer: 'KademliaPeer'):
@ -70,14 +64,14 @@ class BlobDownloader:
to_remove = [peer for (peer, task) in self.active_connections.items() if task.done()]
for peer in to_remove:
del self.active_connections[peer]
self.clearbanned()
def clearbanned(self):
now = self.loop.time()
timeout_for = lambda peer: min(30.0, (self.failures.get(peer, 0) ** self.BAN_FACTOR) - 1.0)
forgiven = [banned_peer for banned_peer, when in self.ignored.items() if now - when > timeout_for(banned_peer)]
self.peer_queue.put_nowait(forgiven)
for banned_peer in forgiven:
self.ignored.pop(banned_peer)
self.ignored = dict((
(peer, when) for (peer, when) in self.ignored.items()
if (now - when) < min(30.0, (self.failures.get(peer, 0) ** self.BAN_FACTOR))
))
@cache_concurrent
async def download_blob(self, blob_hash: str, length: typing.Optional[int] = None) -> 'AbstractBlob':
@ -86,15 +80,16 @@ class BlobDownloader:
return blob
try:
while not blob.get_is_verified():
batch: typing.List['KademliaPeer'] = []
batch: typing.Set['KademliaPeer'] = set()
while not self.peer_queue.empty():
batch.extend(self.peer_queue.get_nowait())
batch.sort(key=lambda p: self.scores.get(p, 0), reverse=True)
batch.update(self.peer_queue.get_nowait())
if batch:
self.peer_queue.put_nowait(list(batch))
log.debug(
"running, %d peers, %d ignored, %d active",
len(batch), len(self.ignored), len(self.active_connections)
)
for peer in batch:
for peer in sorted(batch, key=lambda peer: self.scores.get(peer, 0), reverse=True):
if not self.should_race_continue(blob):
break
if peer not in self.active_connections and peer not in self.ignored:
@ -103,26 +98,9 @@ class BlobDownloader:
self.active_connections[peer] = t
await self.new_peer_or_finished()
self.cleanup_active()
if batch:
to_re_add = list(set(batch).difference(self.ignored))
if to_re_add:
self.peer_queue.put_nowait(to_re_add)
else:
self.clearbanned()
else:
self.clearbanned()
blob.close()
log.debug("downloaded %s", blob_hash[:8])
return blob
finally:
re_add = set()
while self.active_connections:
peer, t = self.active_connections.popitem()
t.cancel()
re_add.add(peer)
re_add = re_add.difference(self.ignored)
if re_add:
self.peer_queue.put_nowait(list(re_add))
blob.close()
def close(self):