def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
LoggingMixin.__init__(self,
logger=logging.getLogger("serial"),
extra_func=partial(str, f"[Serial Writer {self.ser.name}]"))
self.unsent = deque(maxlen=20)
self.retry_backoff = BackoffGenerator(0.100, 1.2, 1.000)
def awaiting_release_handler(circuit: NetRomCircuit, event: NetRomStateEvent,
netrom: NetRom,
logger: LoggingMixin) -> NetRomStateType:
assert circuit.state == NetRomStateType.AwaitingRelease
if event.event_type == NetRomEventType.NETROM_DISCONNECT_ACK:
if event.packet.circuit_idx == circuit.circuit_idx and event.packet.circuit_id == circuit.circuit_id:
netrom.nl_disconnect_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call)
return NetRomStateType.Disconnected
else:
logger.debug("Invalid disconnect ack. Disconnecting anyways")
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_DISCONNECT:
disc_ack = NetRomPacket(
event.packet.source,
event.packet.dest,
7, # TODO configure TTL
event.packet.circuit_idx,
event.packet.circuit_id,
0, # Our circuit idx
0, # Our circuit id
OpType.DisconnectAcknowledge.as_op_byte(False, False, False))
netrom.write_packet(disc_ack)
netrom.nl_disconnect_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call)
circuit.timer.cancel()
return NetRomStateType.Disconnected
else:
# TODO handle any other cases differently?
return NetRomStateType.AwaitingRelease
def __init__(self, config: PortConfig, link_port: int, link_call: AX25Call,
scheduler: Scheduler, queue: L2Queuing,
link_multiplexer: DefaultLinkMultiplexer,
l3_protocols: L3Protocols, intercept_calls: Set[AX25Call],
interceptor: Callable[[FrameData], None]):
self.config = config
self.link_port = link_port
self.link_call = link_call
self.queue = queue # l2 buffer
self.link_multiplexer = link_multiplexer
self.l3_protocols = l3_protocols
self.intercept_calls = intercept_calls
self.interceptor = interceptor
# Mapping of link_id to AX25 address. When we establish new logical links,
# add them here so we can properly address payloads from L3
self.links_by_id: Dict[int, AX25Call] = dict()
self.links_by_address: Dict[AX25Call, int] = dict()
self.state_machine = AX25StateMachine(self, scheduler.timer)
self.link_multiplexer.register_device(self)
self.cq_timer = scheduler.timer(300_000, self._send_cq, True)
scheduler.timer(5_000, self.state_machine.start, True)
def extra():
return f"[L2 AX25 Port={self.link_port} Call={str(self.link_call)}]"
LoggingMixin.__init__(self, extra_func=extra)
def __init__(self,
node_call: AX25Call,
node_alias: str,
scheduler: Scheduler,
link_multiplexer: LinkMultiplexer,
routing_table):
LoggingMixin.__init__(self)
self.node_call = node_call
self.node_alias = node_alias
self.link_multiplexer = link_multiplexer
self.router = routing_table
self.nodes_timer = scheduler.timer(60000.0, self.broadcast_nodes)
self.netrom_transport = None
self.nodes_lock = threading.Lock()
# Register our-calls with routing table
for l2 in link_multiplexer.l2_devices.values():
l2_address = l2.get_link_address()
if isinstance(l2_address, AX25Address):
self.router.our_calls.add(cast(AX25Address, l2_address).to_ax25_call())
now = datetime.datetime.now()
prune_intervals = round((now - self.router.updated_at).seconds / 60.000)
if prune_intervals < 10:
self.info(f"Pruning routes {prune_intervals} times")
for i in range(prune_intervals):
self.router.prune_routes()
else:
self.info("Routes too old, discarding.")
self.router.clear_routes()
self.nodes_timer.start()
self.broadcast_nodes()
def __init__(self, config: NetworkConfig, loop: AbstractEventLoop):
self.config = config
self.sm = NetRomStateMachine(self, AsyncioTimer)
self.router = NetRomRoutingTable(config.node_alias())
self.l3_apps: Dict[AX25Call, str] = {}
# Mapping of destination addresses to protocol factory. When a new connection is made to the destination
# we will create a new instance of the protocol as well as a NetRom transport and add it to l3_connections
self.l3_servers: Dict[AX25Call, Callable[[], Protocol]] = {}
# This is a mapping of local circuit IDs to (transport, protocol). When incoming data is handled for a
# circuit, this is how we pass it on to the instance of the protocol
self.l3_connections: Dict[int, Tuple[Transport, Protocol]] = {}
# This is a mapping of local circuit ID to a protocol factory. These protocols do not yet have a transport and
# are in a half-opened state. Once a connect ack is received, a transport will be created and these will be
# migrated to l3_connections
self.l3_half_open: Dict[int, Callable[[], Protocol]] = {}
self.data_links: Dict[int, DataLinkManager] = {}
self.route_lock = Lock()
self.loop = loop
def extra():
return f"[L4 Call={str(config.node_call())} Alias={config.node_alias()}]"
LoggingMixin.__init__(self, logging.getLogger("main"), extra)
def __init__(self, queue: L3Queueing, l2: L2Protocol):
CloseableThreadLoop.__init__(
self, name=f"L3-to-L2 for Port={l2.get_device_id()}")
LoggingMixin.__init__(self)
self.queue = queue
self.l2 = l2
self.retry_backoff = BackoffGenerator(0.500, 1.5, 3.000)
def __init__(self, network_app: NetworkApp, environ: Dict[str, Any]):
LoggingMixin.__init__(self)
self.environ = environ
self.network_app = network_app
self.transport = None
self.closed = False
self.unpacker = msgpack.Unpacker()
def __init__(self, protocol: IOProtocol, device_name: str, speed: int,
timeout: float, scheduler: Scheduler):
LoggingMixin.__init__(self)
CloseableThreadLoop.__init__(self, f"Serial Device {device_name}")
self._scheduler = scheduler
self._device_name = device_name
self._protocol = protocol
self._ser = serial.Serial(port=None,
baudrate=speed,
timeout=timeout,
write_timeout=timeout)
self._ser.port = device_name
self._closed_latch = CountDownLatch(2)
self._open_event = threading.Event()
self._error_event = threading.Event()
self._open_backoff = BackoffGenerator(0.100, 1.2, 5.000)
# Submit the reader and writer threads first, so they will be shutdown first
self._scheduler.submit(
SerialReadLoop(f"Serial Reader {self._ser.name}", self._ser,
self._protocol, self._open_event, self._error_event,
self._closed_latch))
self._scheduler.submit(
SerialWriteLoop(f"Serial Writer {self._ser.name}", self._ser,
self._protocol, self._open_event,
self._error_event, self._closed_latch))
self._scheduler.submit(self)
def __init__(self, l3_protocol: L3Protocol):
LoggingMixin.__init__(self)
self.l3_protocol = l3_protocol
self.connections: Dict[int, Tuple[Transport, DProtocol]] = dict()
self.l3_protocol.register_transport_protocol(self)
self.broadcast_protocol: Optional[BroadcastProtocol] = None
self.datagram_protocol: Optional[DatagramProtocol] = None
def __init__(self, path: str, protocol: Protocol):
CloseableThread.__init__(self, f"Unix Server {path}")
LoggingMixin.__init__(self)
self.path = path
self.protocol = protocol
self.server: Optional[Server] = None
self._loop: Optional[AbstractEventLoop] = None
def __init__(self, config: NetworkConfig, l3_protocol: L3Protocol,
scheduler: Scheduler):
self.config = config
self.sm = NetRomStateMachine(self, scheduler.timer)
# Mapping of destination addresses to protocol factory. When a new connection is made to the destination
# we will create a new instance of the protocol as well as a NetRom transport and add it to l3_connections
self.l3_servers: Dict[AX25Call, Callable[[], Protocol]] = {}
# This is a mapping of local circuit IDs to (transport, protocol). When incoming data is handled for a
# circuit, this is how we pass it on to the instance of the protocol
self.l3_connections: Dict[int, Tuple[Transport, Protocol]] = {}
# This is a mapping of local circuit ID to a protocol factory. These protocols do not yet have a transport and
# are in a half-opened state. Once a connect ack is received, a transport will be created and these will be
# migrated to l3_connections
self.l3_half_open: Dict[int, Protocol] = {}
self.l3_destinations: Set[AX25Call] = set()
self.l3_protocol = l3_protocol
self.l3_protocol.register_transport_protocol(self)
def extra():
return f"[L4]"
LoggingMixin.__init__(self, logging.getLogger("main"), extra)
def __init__(self, network: L3Protocol, datagram_manager: L4Protocol,
fragment_protocol: FragmentProtocol,
reliable_protocol: ReliableProtocol):
LoggingMixin.__init__(self)
self.network = network
self.datagram_manager = datagram_manager
self.fragment_protocol = fragment_protocol
self.reliable_protocol = reliable_protocol
def __init__(self, network: MeshProtocol, transport: L4Protocol,
reliable_manager: ReliableManager):
LoggingMixin.__init__(self)
self.network = network
self.transport = transport
self.reliable_manager = reliable_manager
self.send_seq: int = 1
self.seq_lock = threading.Lock()
self.ttl_cache = TTLCache(WallTime(), 30_000)
def __init__(self, host: str, port: int, port_mapping: Dict[AX25Call, int],
port_queues: Dict[int, L2Queuing], writer: UDPWriter):
CloseableThread.__init__(self, f"UDP {host}:{port}")
LoggingMixin.__init__(self, udp_logger)
self.host = host
self.port = port
self.port_mapping = port_mapping
self.port_queues = port_queues
self.writer = writer
self._loop: Optional[AbstractEventLoop] = None
self._transport = None
def __init__(self, network: L3Protocol, datagram_manager: L4Protocol):
LoggingMixin.__init__(self)
self.network = network
self.datagram_manager = datagram_manager
self.send_seq: int = 1
self.seq_lock = threading.Lock()
# A buffer of undelivered fragment. Structured like source -> sequence -> fragments
self.buffer: Dict[MeshAddress, Dict[
int, List[Fragment]]] = defaultdict(lambda: defaultdict(list))
def __init__(self, app_name: str, app_call: AX25Call, app_alias: str,
transport_manager: NetRomTransportProtocol,
multiplexer: TransportMultiplexer):
Protocol.__init__(self)
LoggingMixin.__init__(self)
self.app_name = app_name
self.app_call = app_call
self.app_alias = app_alias
self.transport_manager = transport_manager
self.multiplexer = multiplexer
self.unpacker = msgpack.Unpacker()
self.out_queue = queue.Queue()
def __init__(self, app_name: str, app_alias: str, app_bind_address: str,
transport_manager: L4Protocol,
multiplexer: TransportMultiplexer):
Protocol.__init__(self)
LoggingMixin.__init__(self)
self.app_name = app_name
self.app_alias = app_alias
self.app_bind_address = app_bind_address
self.transport_manager = transport_manager
self.multiplexer = multiplexer
self.unpacker = msgpack.Unpacker()
self.out_queue = queue.Queue()
def __init__(self, queue_size, max_payload_size):
LoggingMixin.__init__(self)
self._max_payload_size = max_payload_size
self._outbound = queue.Queue(maxsize=queue_size)
# Ring buffer for decoded inbound messages
self._inbound = deque(maxlen=queue_size)
self._inbound_count = itertools.count()
self._last_inbound = next(self._inbound_count)
self._lock: threading.Lock = threading.Lock()
self._not_empty: threading.Condition = threading.Condition(self._lock)
def __init__(self, config: NetworkConfig, link: LinkMultiplexer,
network: MeshProtocol,
transport_manager: MeshTransportManager,
scheduler: Scheduler):
self.config = config
self.l3 = network
self.l2s = link
self.l4 = transport_manager
self.scheduler = scheduler
self.transport: Optional[Transport] = None
self.client_transport: Optional[Transport] = None
self.pending_open: Optional[AX25Call] = None
self.parser = argparse.ArgumentParser(prog="TARPN", add_help=False)
sub_parsers = self.parser.add_subparsers(title="command",
required=True,
dest="command")
sub_parsers.add_parser("help", description="Print this help")
sub_parsers.add_parser("bye", description="Disconnect from this node")
sub_parsers.add_parser("whoami", description="Print the current user")
sub_parsers.add_parser("hostname",
description="Print the current host")
sub_parsers.add_parser("routes",
description="Print the current routing table")
sub_parsers.add_parser(
"nodes", description="Print the nodes in the routing table")
port_parser = sub_parsers.add_parser(
"ports", description="List available ports")
port_parser.add_argument("--verbose", "-v", action="store_true")
link_parser = sub_parsers.add_parser("links",
description="Show existing links")
link_parser.add_argument("--verbose", "-v", action="store_true")
connect_parser = sub_parsers.add_parser(
"connect", description="Connect to a remote station")
connect_parser.add_argument("dest",
type=str,
help="Destination callsign to connect to")
def extra():
if self.transport:
(host, port) = self.transport.get_extra_info('peername')
return f"[Admin {host}:{port}]"
else:
return ""
LoggingMixin.__init__(self, extra_func=extra)
self.info("Created NodeCommandProcessor")
def __init__(self, network: MeshProtocol, scheduler: Scheduler):
LoggingMixin.__init__(self)
self.network = network
self.scheduler = scheduler
self.mutex = threading.Lock()
self.not_empty = threading.Condition(self.mutex)
self.not_full = threading.Condition(self.mutex)
self.sent: deque[ReliableItem] = deque()
self.timer = scheduler.timer(3_000, self.check_acks)
self.backoff = backoff(1_000, 1.2, 5_000)
self.seq_by_neighbor: Dict[MeshAddress, int] = defaultdict(int)
def __init__(self, link_call: AX25Call, link_port: int,
inbound: asyncio.Queue, outbound: asyncio.Queue,
future_provider: Callable[[], Future]):
self.link_call = link_call
self.link_port = link_port
self.inbound = inbound # PortFrame
self.outbound = outbound # PortFrame
self.state_machine = AX25StateMachine(self, AsyncioTimer)
self.l3_handlers: List[L3Handler] = []
self.future_provider = future_provider
self._stopped: bool = False
def extra():
return f"[L2 Port={self.link_port} Call={str(self.link_call)}]"
LoggingMixin.__init__(self, logging.getLogger("main"), extra)
def awaiting_connection_handler(circuit: NetRomCircuit,
event: NetRomStateEvent, netrom: NetRom,
logger: LoggingMixin) -> NetRomStateType:
assert circuit.state == NetRomStateType.AwaitingConnection
if event.event_type == NetRomEventType.NETROM_CONNECT:
return NetRomStateType.AwaitingConnection
elif event.event_type == NetRomEventType.NETROM_CONNECT_ACK:
ack = cast(NetRomConnectAck, event.packet)
if ack.circuit_idx == circuit.circuit_idx and ack.circuit_id == circuit.circuit_id:
circuit.remote_circuit_idx = ack.tx_seq_num
circuit.remote_circuit_id = ack.rx_seq_num
circuit.window_size = ack.accept_window_size
netrom.nl_connect_indication(
circuit.circuit_idx, circuit.circuit_id, circuit.remote_call,
circuit.local_call, circuit.origin_node, circuit.origin_user)
circuit.timer.reset()
return NetRomStateType.Connected
else:
logger.debug("Unexpected circuit id in connection ack")
return NetRomStateType.AwaitingConnection
elif event.event_type in (NetRomEventType.NETROM_DISCONNECT,
NetRomEventType.NETROM_DISCONNECT_ACK,
NetRomEventType.NETROM_INFO,
NetRomEventType.NETROM_INFO_ACK):
return NetRomStateType.AwaitingConnection
elif event.event_type == NetRomEventType.NL_CONNECT:
conn = NetRomConnectRequest(
circuit.remote_call,
circuit.local_call,
7, # TODO configure TTL
circuit.circuit_idx,
circuit.circuit_id,
0, # Unused
0, # Unused
OpType.ConnectRequest.as_op_byte(False, False, False),
2, # TODO get this from config
circuit.origin_user, # Origin user
circuit.origin_node # Origin node
)
netrom.write_packet(conn)
circuit.timer.reset()
return NetRomStateType.AwaitingConnection
elif event.event_type in (NetRomEventType.NL_DISCONNECT,
NetRomEventType.NL_DATA):
return NetRomStateType.AwaitingConnection
def __init__(self, time: Time, config: NetworkConfig,
link_multiplexer: LinkMultiplexer, l4_handlers: L4Handlers,
scheduler: Scheduler):
LoggingMixin.__init__(self, extra_func=self.log_ident)
CloseableThreadLoop.__init__(self, name="MeshNetwork")
self.time = time
self.config = config
self.link_multiplexer = link_multiplexer
self.l4_handlers = l4_handlers
self.scheduler = scheduler
self.queue = queue.Queue()
self.our_address = MeshAddress.parse(config.get("mesh.address"))
self.host_name = config.get("host.name")
self.ping_protocol = PingProtocol(self)
# TTL cache of seen frames from each source
self.header_cache: TTLCache = TTLCache(time, 30_000)
# Our own send sequence
self.send_seq: int = 1
self.seq_lock = threading.Lock()
# Link states and neighbors
self.neighbors: Dict[MeshAddress, Neighbor] = dict()
# An epoch for our own link state changes. Any time a neighbor comes or goes, or the quality changes,
# we increment this counter. Uses a "lollipop sequence" to allow for easy detection of wrap around vs
# reset
self.our_link_state_epoch_generator = lollipop_sequence()
self.our_link_state_epoch: int = next(
self.our_link_state_epoch_generator)
# Epochs we have received from other nodes and their link states
self.link_state_epochs: Dict[MeshAddress, int] = dict()
self.host_names: Dict[MeshAddress, str] = dict()
self.link_states: Dict[MeshAddress, List[LinkStateHeader]] = dict()
self.last_hello_time = datetime.fromtimestamp(0)
self.last_advert = datetime.utcnow()
self.last_query = datetime.utcnow()
self.last_epoch_bump = datetime.utcnow()
self.scheduler.timer(1_000, partial(self.scheduler.submit, self), True)
def __init__(self, settings: Settings, links: List[DataLinkManager],
network: NetRom):
self.settings: Settings = settings
self.transport: Optional[Transport] = None
self.client_transport: Optional[NetworkTransport] = None
self.datalinks: List[DataLinkManager] = links
self.network: NetRom = network
self.pending_open: Optional[AX25Call] = None
parser = argparse.ArgumentParser(prog="TARPN", add_help=False)
sub_parsers = parser.add_subparsers(title="command",
required=True,
dest="command")
sub_parsers.add_parser("help", description="Print this help")
sub_parsers.add_parser("bye", description="Disconnect from this node")
sub_parsers.add_parser("whoami", description="Print the current user")
sub_parsers.add_parser("hostname",
description="Print the current host")
port_parser = sub_parsers.add_parser(
"ports", description="List available ports")
port_parser.add_argument("--verbose", "-v", action="store_true")
link_parser = sub_parsers.add_parser("links",
description="Show existing links")
link_parser.add_argument("--verbose", "-v", action="store_true")
connect_parser = sub_parsers.add_parser(
"connect", description="Connect to a remote station")
connect_parser.add_argument("dest",
type=str,
help="Destination callsign to connect to")
self.parser = parser
def extra():
if self.transport:
(host, port) = self.transport.get_extra_info('peername')
return f"[Admin {host}:{port}]"
else:
return ""
LoggingMixin.__init__(self, logging.getLogger("main"), extra)
self.info("Created CommandProcessorProtocol")
def __init__(self,
port_id: int,
queue: L2IOQueuing,
check_crc: bool = False,
hdlc_port: int = 0):
self.port_id = port_id
self.check_crc = check_crc
self.hdlc_port = hdlc_port
self.msgs_recvd = 0
self.in_frame = False
self.saw_fend = False
self._l2_queue: L2IOQueuing = queue
self._send_immediate: Optional[bytes] = None
self._buffer = bytearray()
self.closed = False
LoggingMixin.__init__(self, logging.getLogger("main"))
def __init__(self, link_port: int, link_call: AX25Call,
scheduler: Scheduler, queue: L2Queuing,
link_multiplexer: LinkMultiplexer, l3_protocols: L3Protocols):
self.link_port = link_port
self.link_call = link_call
self.queue = queue # l2 buffer
self.link_multiplexer = link_multiplexer
self.l3_protocols = l3_protocols
# Mapping of link_id to AX25 address. When we establish new logical links,
# add them here so we can properly address payloads from L3
self.links_by_id: Dict[int, AX25Call] = dict()
self.links_by_address: Dict[AX25Call, int] = dict()
self.state_machine = AX25StateMachine(self, scheduler.timer)
self.link_multiplexer.register_device(self)
def extra():
return f"[L2 AX25 Port={self.link_port} Call={str(self.link_call)}]"
LoggingMixin.__init__(self, logging.getLogger("main"), extra)
def _handle_event(self, event: NetRomStateEvent):
if event is not None:
circuit = self._get_circuit(event.circuit_id, event.circuit_id)
handler = self._handlers[circuit.state]
if handler is None:
raise RuntimeError(f"No handler for state {handler}")
logger = LoggingMixin(self._logger, circuit.log_prefix)
try:
new_state = handler(circuit, event, self._netrom, logger)
circuit.state = new_state
logger.info(f"Handled {event}")
except Exception:
logger.exception(f"Failed to handle {event}")
def connected_handler(circuit: NetRomCircuit, event: NetRomStateEvent,
netrom: NetRom, logger: LoggingMixin) -> NetRomStateType:
assert circuit.state == NetRomStateType.Connected
if event.event_type == NetRomEventType.NETROM_CONNECT:
connect_req = cast(NetRomConnectRequest, event.packet)
if connect_req.circuit_idx == circuit.circuit_idx and connect_req.circuit_id == circuit.circuit_id:
# Treat this as a reconnect and ack it
connect_ack = NetRomConnectAck(
connect_req.source,
connect_req.dest,
7, # TODO get TTL from config
connect_req.circuit_idx,
connect_req.circuit_id,
circuit.circuit_idx,
circuit.circuit_id,
OpType.ConnectAcknowledge.as_op_byte(False, False, False),
connect_req.proposed_window_size)
netrom.write_packet(connect_ack)
netrom.nl_connect_indication(
circuit.circuit_idx, circuit.circuit_id, circuit.remote_call,
circuit.local_call, circuit.origin_node, circuit.origin_user)
circuit.timer.reset()
return NetRomStateType.Connected
else:
# Reject this and disconnect
logger.debug(
"Rejecting connect request due to invalid circuit ID/IDX")
connect_rej = NetRomConnectAck(
connect_req.source,
connect_req.dest,
7, # TODO get TTL from config
connect_req.circuit_idx,
connect_req.circuit_id,
circuit.circuit_idx,
circuit.circuit_id,
OpType.ConnectAcknowledge.as_op_byte(True, False, False),
connect_req.proposed_window_size)
netrom.write_packet(connect_rej)
netrom.nl_disconnect_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call)
circuit.timer.cancel()
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_CONNECT_ACK:
connect_ack = cast(NetRomConnectAck, event.packet)
if connect_ack.tx_seq_num == circuit.remote_circuit_idx and \
connect_ack.rx_seq_num == circuit.remote_circuit_id and \
connect_ack.circuit_idx == circuit.circuit_idx and \
connect_ack.circuit_id == circuit.circuit_id:
netrom.nl_connect_indication(
circuit.circuit_idx, circuit.circuit_id, circuit.remote_call,
circuit.local_call, circuit.origin_node, circuit.origin_user)
circuit.timer.reset()
return NetRomStateType.Connected
else:
# TODO what now?
return NetRomStateType.Connected
elif event.event_type == NetRomEventType.NETROM_DISCONNECT:
disc_ack = NetRomPacket(
event.packet.source,
event.packet.dest,
7, # TODO configure TTL
circuit.remote_circuit_id,
circuit.remote_circuit_id,
0, # Not used
0, # Not used
OpType.DisconnectAcknowledge.as_op_byte(False, False, False))
netrom.write_packet(disc_ack)
netrom.nl_disconnect_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call)
circuit.timer.cancel()
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_DISCONNECT_ACK:
logger.debug("Unexpected disconnect ack in connected state!")
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_INFO:
"""
The TX number from the INFO packet is the current sequence number while the the RX number is the next
expected sequence number on the other end of the circuit. This serves as a mechanism to acknowledge
previous INFO without sending an explicit ACK
"""
info = cast(NetRomInfo, event.packet)
if info.tx_seq_num == circuit.recv_state():
# We got the message number we expected
circuit.inc_recv_state()
circuit.enqueue_info_ack(netrom)
circuit.more += info.info
if not info.more_follows():
# TODO expire old more-follows data
netrom.nl_data_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call, circuit.more)
circuit.more = bytearray()
elif info.tx_seq_num < circuit.recv_state():
# Possible retransmission of previous message, ignore?
pass
else:
# Got a higher number than expected, we missed something, ask the sender to rewind
# to our last confirmed state
nak = NetRomPacket(
info.source,
info.dest,
7, # TODO config
circuit.remote_circuit_idx,
circuit.remote_circuit_id,
0, # Unused
circuit.recv_state(),
OpType.InformationAcknowledge.as_op_byte(False, True, False))
netrom.write_packet(nak)
# Handle the ack logic
if info.rx_seq_num > circuit.hw:
for seq in range(info.rx_seq_num, circuit.hw + 1):
seq = (seq + 127) % 128
circuit.info_futures[seq].set_result(True)
circuit.hw = info.rx_seq_num
else:
# Out of sync, error
pass
if info.rx_seq_num == circuit.send_state():
# We are in-sync, all is well
pass
elif info.rx_seq_num < circuit.send_state():
# Other side is lagging
pass
else:
# Other side has ack'd something out of range, raise an error
pass
# Handle the other flags
if info.choke():
# TODO stop sending until further notice
pass
if info.nak():
seq_resend = event.packet.rx_seq_num
logger.warning(f"Got Info NAK, rewinding to {seq_resend}")
while seq_resend < circuit.send_state():
info_to_resend = circuit.sent_info[seq_resend]
info_to_resend.rx_seq_num = circuit.recv_state()
netrom.write_packet(info_to_resend)
seq_resend += 1
return NetRomStateType.Connected
elif event.event_type == NetRomEventType.NETROM_INFO_ACK:
"""
If the choke flag is set (bit 7 of the opcode byte), it indicates that this node cannot accept any more
information messages until further notice. If the NAK flag is set (bit 6 of the opcode byte), it indicates that
a selective retransmission of the frame identified by the Rx Sequence Number is being requested.
"""
ack = event.packet
if ack.rx_seq_num > circuit.hw:
for seq in range(ack.rx_seq_num, circuit.hw + 1):
seq = (seq + 127) % 128
fut = circuit.info_futures.get(seq)
if fut:
fut.set_result(True)
circuit.hw = ack.rx_seq_num
else:
# Out of sync, error
pass
if ack.rx_seq_num == circuit.send_state():
seq = (ack.rx_seq_num + 127) % 128
fut = circuit.info_futures.get(seq)
if fut:
fut.set_result(True)
elif ack.rx_seq_num < circuit.send_state():
# Lagging behind
pass
else:
# Invalid state, error
pass
if ack.choke():
logger.warning("Got Info Choke")
# TODO stop sending until further notice
pass
if ack.nak():
seq_resend = event.packet.rx_seq_num
logger.warning(f"Got Info NAK, rewinding to {seq_resend}")
while seq_resend < circuit.send_state():
info_to_resend = circuit.sent_info[seq_resend]
info_to_resend.rx_seq_num = circuit.recv_state()
netrom.write_packet(info_to_resend)
seq_resend += 1
elif event.packet.rx_seq_num != circuit.send_state():
logger.warning("Info sync error")
# Out of sync, what now? Update circuit send state?
pass
return NetRomStateType.Connected
elif event.event_type == NetRomEventType.NL_CONNECT:
conn = NetRomConnectRequest(
circuit.remote_call,
circuit.local_call,
7, # TODO configure TTL
circuit.circuit_idx,
circuit.circuit_id,
0, # Unused
0, # Unused
OpType.ConnectRequest.as_op_byte(False, False, False),
2, # TODO get this from config
circuit.origin_user, # Origin user
circuit.origin_node, # Origin node
)
netrom.write_packet(conn)
circuit.timer.reset()
return NetRomStateType.AwaitingConnection
elif event.event_type == NetRomEventType.NL_DISCONNECT:
disc = NetRomPacket(
circuit.remote_call,
circuit.local_call,
7, # TODO configure TTL
circuit.remote_circuit_idx,
circuit.remote_circuit_id,
0,
0,
OpType.DisconnectRequest.as_op_byte(False, False, False))
netrom.write_packet(disc)
circuit.timer.cancel()
return NetRomStateType.AwaitingRelease
elif event.event_type == NetRomEventType.NL_DATA:
if event.mtu > 0:
fragments = list(chunks(event.data, event.mtu))
for fragment in fragments[:-1]:
info = NetRomInfo(
circuit.remote_call,
circuit.local_call,
7, # TODO
circuit.remote_circuit_idx,
circuit.remote_circuit_id,
circuit.send_state(),
circuit.recv_state(),
OpType.Information.as_op_byte(False, False, True),
fragment)
netrom.write_packet(info)
circuit.sent_info[info.tx_seq_num] = info
circuit.info_futures[info.tx_seq_num] = event.future
circuit.inc_send_state()
last = fragments[-1]
else:
last = event.data
info = NetRomInfo(
circuit.remote_call,
circuit.local_call,
7, # TODO
circuit.remote_circuit_idx,
circuit.remote_circuit_id,
circuit.send_state(),
circuit.recv_state(),
OpType.Information.as_op_byte(False, False, False),
last)
netrom.write_packet(info)
circuit.sent_info[info.tx_seq_num] = info
circuit.info_futures[info.tx_seq_num] = event.future
circuit.inc_send_state()
async def check_ack():
# TODO need to implement timeout and retry
await asyncio.sleep(10.000)
if circuit.hw <= info.tx_seq_num:
# Retransmit
print(f"Retransmit {info}")
#asyncio.create_task(check_ack())
return NetRomStateType.Connected
def __init__(self, environ):
NetworkApp.__init__(self, environ)
LoggingMixin.__init__(self)
self.context = None
self.info(f"Created with {environ}")
def disconnected_handler(circuit: NetRomCircuit, event: NetRomStateEvent,
netrom: NetRom,
logger: LoggingMixin) -> NetRomStateType:
assert circuit.state == NetRomStateType.Disconnected
if event.event_type == NetRomEventType.NETROM_CONNECT:
connect_req = cast(NetRomConnectRequest, event.packet)
connect_ack = NetRomConnectAck(
connect_req.source,
connect_req.dest,
7, # TODO get TTL from config
connect_req.circuit_idx,
connect_req.circuit_id,
circuit.circuit_idx,
circuit.circuit_id,
OpType.ConnectAcknowledge.as_op_byte(False, False, False),
connect_req.proposed_window_size)
circuit.remote_circuit_id = connect_req.circuit_id
circuit.remote_circuit_idx = connect_req.circuit_idx
if netrom.write_packet(connect_ack):
netrom.nl_connect_indication(
circuit.circuit_idx, circuit.circuit_id, circuit.remote_call,
circuit.local_call, circuit.origin_node, circuit.origin_user)
circuit.timer.reset()
return NetRomStateType.Connected
else:
return NetRomStateType.Disconnected
elif event.event_type in (NetRomEventType.NETROM_CONNECT_ACK,
NetRomEventType.NETROM_INFO,
NetRomEventType.NETROM_INFO_ACK):
# If we're disconnected, we don't have the remote circuit's ID/IDX, so we can't really do
# much here besides try to re-connect
logger.debug(
f"Got unexpected packet {event.packet}. Attempting to reconnect")
disc = NetRomPacket(
circuit.remote_call,
circuit.local_call,
7, # TODO configure TTL
circuit.remote_circuit_idx,
circuit.remote_circuit_id,
0,
0,
OpType.DisconnectRequest.as_op_byte(False, False, False))
if netrom.write_packet(disc):
return NetRomStateType.AwaitingRelease
else:
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_DISCONNECT_ACK:
# We are already disconnected, nothing to do here
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NETROM_DISCONNECT:
# Ack this even though we're not connected
disc_ack = NetRomPacket(
event.packet.source,
event.packet.dest,
7, # TODO configure TTL
0, # Don't know the remote circuit idx
0, # Don't know the remote circuit id
0, # Our circuit idx
0, # Our circuit id
OpType.DisconnectAcknowledge.as_op_byte(False, False, False))
netrom.write_packet(disc_ack)
netrom.nl_disconnect_indication(circuit.circuit_idx,
circuit.circuit_id,
circuit.remote_call,
circuit.local_call)
circuit.timer.cancel()
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NL_CONNECT:
conn = NetRomConnectRequest(
circuit.remote_call,
circuit.local_call,
7, # TODO configure TTL
circuit.circuit_idx,
circuit.circuit_id,
0, # Send no circuit idx
0, # Send no circuit id
OpType.ConnectRequest.as_op_byte(False, False, False),
2, # Proposed window size (TODO get this from config)
circuit.origin_user, # Origin user
circuit.origin_node, # Origin node
)
if netrom.write_packet(conn):
circuit.timer.start()
return NetRomStateType.AwaitingConnection
else:
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NL_DISCONNECT:
return NetRomStateType.Disconnected
elif event.event_type == NetRomEventType.NL_DATA:
logger.debug("Ignoring unexpected NL_DATA event in disconnected state")
return NetRomStateType.Disconnected