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"""Live sync, driven over the multicast group a cluster would use.
Live sync sits behind WANT_SYNC_LIVE, so these only run against a binary
built with it: make check-livesync. Against any other build they skip, which
is what the feature list in -v is for.
"""
import socket
import struct
import subprocess
import unittest
from harness import TRACKER, TrackerTestCase
# enum { OT_SYNC_PEER4, OT_SYNC_PEER6 } in src/ot_livesync.c
SYNC_PEER4 = 0
SYNC_PEER6 = 1
# src/trackerlogic.h
FLAG_SEEDING = 0x80
FLAG_COMPLETED = 0x40
FLAG_STOPPED = 0x20
def has_livesync():
done = subprocess.run([TRACKER, "-v"], capture_output=True, timeout=30)
return b"WANT_SYNC_LIVE" in done.stderr
def peer4(address, port, flags):
"""Four bytes of address, two of port, one of flags, one the tracker
overwrites with its own idea of the time."""
return socket.inet_aton(address) + struct.pack("!H", port) + bytes([flags, 0])
def peer6(address, port, flags):
return socket.inet_pton(socket.AF_INET6, address) + struct.pack("!H", port) + bytes([flags, 0])
def packet(kind, entries, tracker_id=0xDEADBEEF):
body = b"".join(info_hash + peer for info_hash, peer in entries)
return struct.pack("!I", tracker_id) + struct.pack("!I", kind) + body
@unittest.skipUnless(has_livesync(), "this build has no WANT_SYNC_LIVE")
class LiveSyncIn(TrackerTestCase):
config = "livesync.cluster.listen 127.0.0.1:{livesync_port}\nlivesync.cluster.node_ip 127.0.0.1\n"
def counts(self, info_hash):
"""Seeders and leechers a scrape reports for one torrent."""
files = self.tracker.scrape(info_hash)[b"files"]
if info_hash not in files:
return None
entry = files[info_hash]
return entry[b"complete"], entry[b"incomplete"]
def test_a_synced_seeder_arrives(self):
info_hash = self.hash_for("sync-seed")
self.tracker.livesync_send(packet(SYNC_PEER4, [(info_hash, peer4("10.1.2.3", 6881, FLAG_SEEDING))]))
self.assertTrue(self.tracker.wait_until(lambda: self.counts(info_hash) == (1, 0)),
"scrape says %r" % (self.counts(info_hash),))
def test_a_synced_leecher_arrives(self):
info_hash = self.hash_for("sync-leech")
self.tracker.livesync_send(packet(SYNC_PEER4, [(info_hash, peer4("10.1.2.4", 6881, 0))]))
self.assertTrue(self.tracker.wait_until(lambda: self.counts(info_hash) == (0, 1)),
"scrape says %r" % (self.counts(info_hash),))
def test_a_v6_peer_arrives(self):
info_hash = self.hash_for("sync-v6")
self.tracker.livesync_send(packet(SYNC_PEER6, [(info_hash, peer6("2001:db8::1", 6881, FLAG_SEEDING))]))
self.assertTrue(self.tracker.wait_until(lambda: self.counts(info_hash) == (1, 0)),
"scrape says %r" % (self.counts(info_hash),))
def test_one_packet_carries_several_torrents(self):
hashes = [self.hash_for("sync-many-%d" % i) for i in range(4)]
self.tracker.livesync_send(packet(SYNC_PEER4, [(h, peer4("10.1.2.%d" % (5 + i), 6881, FLAG_SEEDING))
for i, h in enumerate(hashes)]))
self.assertTrue(self.tracker.wait_until(lambda: all(self.counts(h) == (1, 0) for h in hashes)))
def test_a_stopped_peer_is_taken_away_again(self):
info_hash = self.hash_for("sync-stop")
peer = peer4("10.1.2.9", 6881, FLAG_SEEDING)
self.tracker.livesync_send(packet(SYNC_PEER4, [(info_hash, peer)]))
self.assertTrue(self.tracker.wait_until(lambda: self.counts(info_hash) == (1, 0)))
self.tracker.livesync_send(packet(SYNC_PEER4, [(info_hash, peer4("10.1.2.9", 6881, FLAG_STOPPED))]))
self.assertTrue(self.tracker.wait_until(lambda: self.counts(info_hash) in (None, (0, 0))),
"scrape still says %r" % (self.counts(info_hash),))
def test_a_truncated_entry_is_dropped(self):
"""The loop takes whole hash and peer pairs and leaves a short tail
where it is, so the complete entry before it still lands."""
good, short = self.hash_for("sync-good"), self.hash_for("sync-short")
payload = packet(SYNC_PEER4, [(good, peer4("10.1.2.10", 6881, FLAG_SEEDING))]) + short + b"\x0a\x01"
self.tracker.livesync_send(payload)
self.assertTrue(self.tracker.wait_until(lambda: self.counts(good) == (1, 0)))
self.assertIsNone(self.counts(short))
def test_an_unknown_packet_type_is_ignored(self):
info_hash = self.hash_for("sync-unknown")
self.tracker.livesync_send(packet(99, [(info_hash, peer4("10.1.2.11", 6881, FLAG_SEEDING))]))
self.assertFalse(self.tracker.wait_until(lambda: self.counts(info_hash) is not None, timeout=1))
def test_synced_peers_are_counted(self):
"""The live sync worker keeps its own tally like every other worker,
and ?mode=syncs is the sum of them."""
before = int(self.tracker.stats("syncs").split()[0])
hashes = [self.hash_for("sync-count-%d" % i) for i in range(3)]
self.tracker.livesync_send(packet(SYNC_PEER4, [(h, peer4("10.1.2.%d" % (20 + i), 6881, FLAG_SEEDING))
for i, h in enumerate(hashes)]))
self.assertTrue(self.tracker.wait_until(
lambda: int(self.tracker.stats("syncs").split()[0]) == before + 3),
"syncs says %s" % self.tracker.stats("syncs").split()[0])
def test_a_packet_with_nothing_but_a_header_is_ignored(self):
before = self.tracker.torrent_count()
self.tracker.livesync_send(struct.pack("!I", 0xDEADBEEF) + struct.pack("!I", SYNC_PEER4))
self.assertFalse(self.tracker.wait_until(lambda: self.tracker.torrent_count() != before, timeout=1))
@unittest.skipUnless(has_livesync(), "this build has no WANT_SYNC_LIVE")
class LiveSyncAccess(TrackerTestCase):
"""Nothing blesses 127.0.0.1 here, so the tracker should take nothing
from it. Source address checking is all live sync has."""
config = "livesync.cluster.listen 127.0.0.1:{livesync_port}\nlivesync.cluster.node_ip 10.0.0.1\n"
def test_an_unblessed_sender_is_ignored(self):
info_hash = self.hash_for("sync-unblessed")
self.tracker.livesync_send(packet(SYNC_PEER4, [(info_hash, peer4("10.1.2.12", 6881, FLAG_SEEDING))]))
self.assertFalse(self.tracker.wait_until(lambda: self.tracker.torrent_count() != 0, timeout=1))
@unittest.skipUnless(has_livesync(), "this build has no WANT_SYNC_LIVE")
class LiveSyncUnconfigured(TrackerTestCase):
"""A binary that has the feature but no cluster to join. Somebody whose
packager turned WANT_SYNC_LIVE on did not ask for live sync and should
not be able to tell that it is there."""
config = ""
def test_the_tracker_runs_anyway(self):
info_hash = self.hash_for("no-cluster")
self.tracker.announce(info_hash, port=6881, left=0)
self.assertEqual(self.tracker.torrent_count(), 1)
def test_nothing_is_said_about_the_missing_cluster(self):
self.assertNotIn("sync", self.tracker.output().lower())
def test_no_socket_is_bound_for_it(self):
"""A configured tracker holds the wildcard address on that port, so
taking it here proves nothing was started."""
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
try:
sock.bind(("0.0.0.0", self.tracker.livesync_port))
finally:
sock.close()
def test_announcing_stays_clean(self):
"""Enough announces to pass the watermark that would flush an
outgoing buffer, if there were one to flush. The sanitizers in this
build turn anything the attempt touched into a failure."""
for i in range(200):
self.tracker.announce(self.hash_for("no-cluster-%d" % i), port=6881 + i, left=0)
self.assertEqual(self.tracker.torrent_count(), 200)
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