def test_online(self):
ab = Addressbook()
ab["vasya"] = vasya_dest
ab["petya"] = petya_dest
ab.set_online(vasya_dest)
self.assertTrue(ab.is_online(vasya_dest))
self.assertFalse(ab.is_online(petya_dest))
self.assertFalse(ab.is_online(masha_dest))
self.assertEqual(len(ab.online_peers()), 1)
ab["masha"] = masha_dest
ab.set_online(masha_dest)
self.assertEqual(len(ab.online_peers()), 2)
class KoteCore:
def __init__(self, datadir, sam_address, session_name=None):
self.datadir = datadir
self.sam_address = sam_address
self.loop = asyncio.get_event_loop()
self.senders = {}
self.online = asyncio.Event(loop=self.loop)
self.destination = None
self.session_reader = None
self.session_writer = None
self.addressbook = Addressbook()
self.uuid_log = deque(maxlen=50)
self.ignore_unauthorized = False
self.session_name = session_name or gen_session_name()
self.started_at = time.time()
self.dest_cache = {}
def create_task(self, fut):
"""Ensure future shortcut"""
return asyncio.ensure_future(fut, loop=self.loop)
async def add_contact(self, name, address, your_name):
"""Add contact to the addressbook and send auth request"""
if address == self.destination.base32: return False
try:
self.addressbook[name] = address
except ValueError as e:
logger.error("Addressbook error: " + str(e))
return False
else:
await save_contacts(self.loop, dict(self.addressbook), self.datadir)
self.senders[address] = MessageSender(self.loop, self.sender)
await self.senders[address].send(Message(code=Message.AUTHORIZATION,
destination=address, content=your_name))
return True
async def remove_contact(self, name):
"""Remove contact from the addressbook"""
try:
addr = self.addressbook[name]
except KeyError as e:
logger.error("Addressbook error: no such name " + str(e))
return False
else:
await self.senders[addr].stop()
del self.senders[addr]
del self.addressbook[name]
await save_contacts(self.loop, dict(self.addressbook), self.datadir)
return True
async def sam_session_loop(self):
"""Self-healing SAM session"""
with suppress(asyncio.CancelledError):
while True:
try:
self.session_reader, self.session_writer = await \
i2plib.create_session(self.session_name,
destination=self.destination,
sam_address=self.sam_address, loop=self.loop)
except (i2plib.DuplicatedDest):
logger.error("SAM destination already exists")
except ConnectionError:
logger.error("SAM API is unavailable")
else:
self.online.set()
logger.debug("SAM session is created: " \
+ self.destination.base32)
await self.session_reader.read()
logger.error("SAM session is dead")
self.online.clear()
logger.info("Restarting SAM session in {} seconds...".format(
SESSION_RESTART_TIMEOUT))
await asyncio.sleep(SESSION_RESTART_TIMEOUT)
async def pinger(self):
"""Send pings to all contacts if there are no online peers, or if
kote is running less than a 1/2 hour. Otherwise, ping online peers each
PING_INTERVAL and all peers each PING_INTERVAL * 6"""
with suppress(asyncio.CancelledError):
x = 0
while True:
await self.online.wait()
if (time.time() - self.started_at) < 1800.0 \
or not self.addressbook.online_peers():
peers = self.addressbook.values()
elif x == 6:
peers, x = self.addressbook.values(), 0
else:
peers, x = self.addressbook.online_peers(), x + 1
for d in peers:
self.create_task(self._send_ping(d))
await asyncio.sleep(PING_INTERVAL)
async def _send_ping(self, destination):
"""One-shot ping message with a random delay"""
with suppress(asyncio.CancelledError, asyncio.TimeoutError):
await asyncio.sleep(random.choice(range(PING_INTERVAL)))
data = await asyncio.wait_for(self._send_message(
Message(code=Message.PING, destination=destination)),
DEFAULT_TIMEOUT * 2)
if data:
await self._dest_online(destination)
async def sender(self, queue):
"""Message sender task"""
with suppress(asyncio.CancelledError):
while True:
await self.online.wait()
msg = await queue.get()
delivered = False
for x in range(SEND_RETRIES):
try:
data = await asyncio.wait_for(self._send_message(msg),
DEFAULT_TIMEOUT)
except asyncio.TimeoutError:
pass
else:
if data:
try:
resp = Message.parse(data, msg.destination)
except ValidationError as e:
logger.warning(
"Invalid response from {}: {}".format(
msg.destination, e))
else:
delivered = True
await self._dest_online(msg.destination)
if resp.code == Message.OK:
logger.debug(str(msg) + " delivered")
elif resp.code == Message.UNAUTHORIZED:
logger.debug(str(msg) + " unauthorized")
resp.name = self.addressbook.get_name(
resp.destination)
await self.on_unauthorized(resp)
break
else:
logger.debug(str(id(msg)) + " retrying")
await asyncio.sleep(DEFAULT_TIMEOUT / 2)
if delivered:
logger.debug(str(msg) + " delivered, retries: " + str(x))
else:
self.senders[msg.destination].stash(msg)
async def _send_message(self, request):
"""Send message and receive response data"""
data = b''
await self.online.wait()
try:
if request.destination not in self.dest_cache:
self.dest_cache[request.destination] = await i2plib.dest_lookup(
request.destination + ".b32.i2p", loop=self.loop,
sam_address=self.sam_address)
reader, writer = await i2plib.stream_connect(self.session_name,
self.dest_cache[request.destination], loop=self.loop,
sam_address=self.sam_address)
except (i2plib.CantReachPeer, i2plib.InvalidKey, i2plib.Timeout, \
i2plib.KeyNotFound, i2plib.PeerNotFound, i2plib.I2PError):
logger.debug("Can't connect to {}".format(request.destination))
except ConnectionError:
logger.warning("_send_message fails: can't connect to SAM")
else:
writer.write(bytes(request))
data = await reader.read(MAX_MESSAGE_LENGTH)
writer.close()
return data
async def receiver(self):
"""Task to receive incoming messages from I2P"""
with suppress(asyncio.CancelledError):
while True:
await self.online.wait()
try:
reader, writer = await i2plib.stream_accept(
self.session_name,
sam_address=self.sam_address, loop=self.loop)
except i2plib.I2PError:
logger.warning("Receiver fails: generic I2P error")
except ConnectionError:
logger.warning("Receiver fails: can't connect to SAM")
await asyncio.sleep(SESSION_RESTART_TIMEOUT)
else:
dest = await reader.readline()
if dest:
asyncio.ensure_future(
self._receive_message(reader, writer, dest),
loop=self.loop)
else:
writer.close()
async def _receive_message(self, reader, writer, destination):
with suppress(asyncio.CancelledError):
destination = i2plib.Destination(destination.decode())
name = self.addressbook.get_name(destination.base32)
if not name and self.ignore_unauthorized:
writer.close()
return
try:
data = await asyncio.wait_for(reader.read(MAX_MESSAGE_LENGTH),
DEFAULT_TIMEOUT)
except asyncio.TimeoutError:
writer.close()
return
try:
request = Message.parse(data, destination.base32)
request.name = name
except ValidationError as e:
logger.warning("Invalid request: "+str(e))
writer.close()
return
if request.uuid.hex in self.uuid_log:
logger.debug("Duplicate message: "+ str(request))
writer.write(bytes(Message(code=Message.OK)))
writer.close()
return
self.uuid_log.append(request.uuid.hex)
logger.debug("Received message: " + str(request))
if request.code == Message.PING \
or request.code == Message.AUTHORIZATION:
writer.write(bytes(Message(code=Message.OK)))
writer.close()
if request.code == Message.PING:
await self.on_ping(request)
elif request.code == Message.AUTHORIZATION:
await self.on_authorization(request)
elif request.name:
writer.write(bytes(Message(code=Message.OK)))
writer.close()
if request.code == Message.PRIVATE:
await self.on_private_message(request)
elif request.code == Message.PUBLIC:
await self.on_public_message(request)
elif request.code == Message.UNAUTHORIZED:
await self.on_unauthorized(request)
else:
writer.write(bytes(Message(code=Message.UNAUTHORIZED)))
writer.close()
return
await self._dest_online(request.destination)
async def _dest_online(self, destination):
"""Is triggered when any Message or data is received from the destination"""
name = self.addressbook.get_name(destination)
if name:
if not self.addressbook.is_online(destination):
logger.debug("Contact becomes online "+destination)
await self.on_contact_online(name)
await self.senders[destination].send_stash()
self.addressbook.set_online(destination)
async def start(self):
"""Start all tasks"""
self.destination = await load_destination(self.loop, self.sam_address,
self.datadir)
c = await load_contacts(self.loop, self.datadir)
self.addressbook.update(c)
logger.debug("Contacts: " + str(self.addressbook))
for address in self.addressbook.values():
self.senders[address] = MessageSender(self.loop, self.sender)
self.receiver_task = self.create_task(self.receiver())
self.pinger_task = self.create_task(self.pinger())
self.sam_session_loop_task = self.create_task(self.sam_session_loop())
async def stop(self):
"""Stop all tasks"""
self.online.clear()
for t in self.senders.values():
await t.stop()
for t in [self.receiver_task, self.pinger_task,
self.sam_session_loop_task]:
t.cancel()
await t
def run_app(self):
"""Application runner"""
if not i2plib.utils.is_address_accessible(self.sam_address):
logger.critical("SAM is unavailable")
return
if not os.path.exists(self.datadir):
try:
pathlib.Path(self.datadir).mkdir(mode=0o700, parents=True)
logger.info("Created a new data directory: "+self.datadir)
except PermissionError:
logger.critical("Can't create data directory: "+self.datadir)
return
self.loop.run_until_complete(self.start())
try:
self.loop.run_forever()
except KeyboardInterrupt:
logger.info("Interrupted, shutting down...")
finally:
self.loop.run_until_complete(self.stop())
self.loop.run_until_complete(cancel_pending_tasks(self.loop))
self.loop.stop()
self.loop.close()
async def send_message(self, msg):
"""Add Message to sender queue
Use this method only for authorized contacts!"""
if self.addressbook.is_online(msg.destination):
await self.senders[msg.destination].send(msg)
else:
self.senders[msg.destination].stash(msg)
async def on_authorization(self, msg):
"""Is triggered when Message.AUTHORIZATION is received"""
pass
async def on_ping(self, msg):
"""Is triggered when Message.PING is received"""
pass
async def on_contact_online(self, name):
"""Is triggered when any Message is received and peer was offline"""
pass
async def on_private_message(self, msg):
"""Is triggered when Message.PRIVATE is received"""
pass
async def on_public_message(self, msg):
"""Is triggered when Message.PUBLIC is received"""
pass
async def on_unauthorized(self, msg):
"""Is triggered when Message.UNAUTHORIZED is received"""
pass