async def perform_handshake(
self, connection: Connection) -> AsyncGenerator[Connection, None]:
"""
Performs handshake with this new connection, and yields the connection. If the handshake
is unsuccessful, or we already have a connection with this peer, the connection is closed,
and nothing is yielded.
"""
# Send handshake message
outbound_handshake = Message(
"handshake",
Handshake(
config["network_id"],
protocol_version,
self._node_id,
uint16(self._port),
self._local_type,
),
)
try:
await connection.send(outbound_handshake)
# Read handshake message
full_message = await connection.read_one_message()
inbound_handshake = Handshake(**full_message.data)
if (full_message.function != "handshake" or not inbound_handshake
or not inbound_handshake.node_type):
raise InvalidHandshake("Invalid handshake")
if inbound_handshake.node_id == self._node_id:
raise InvalidHandshake(
f"Should not connect to ourselves, aborting handshake.")
# Makes sure that we only start one connection with each peer
connection.node_id = inbound_handshake.node_id
connection.peer_server_port = int(inbound_handshake.server_port)
connection.connection_type = inbound_handshake.node_type
if not self.global_connections.add(connection):
raise InvalidHandshake(f"Duplicate connection to {connection}")
# Send Ack message
await connection.send(Message("handshake_ack", HandshakeAck()))
# Read Ack message
full_message = await connection.read_one_message()
if full_message.function != "handshake_ack":
raise InvalidAck("Invalid ack")
if inbound_handshake.version != protocol_version:
raise IncompatibleProtocolVersion(
f"Our node version {protocol_version} is not compatible with peer\
{connection} version {inbound_handshake.version}")
log.info((
f"Handshake with {NodeType(connection.connection_type).name} {connection.get_peername()} "
f"{connection.node_id}"
f" established"))
# Only yield a connection if the handshake is succesful and the connection is not a duplicate.
yield connection
except (
IncompatibleProtocolVersion,
InvalidAck,
InvalidHandshake,
asyncio.IncompleteReadError,
ConnectionResetError,
Exception,
) as e:
log.warning(
f"{e}, handshake not completed. Connection not created.")
# Make sure to close the connection even if it's not in global connections
connection.close()
# Remove the conenction from global connections
self.global_connections.close(connection)
async def perform_handshake(
self, connection: Connection) -> AsyncGenerator[Connection, None]:
"""
Performs handshake with this new connection, and yields the connection. If the handshake
is unsuccessful, or we already have a connection with this peer, the connection is closed,
and nothing is yielded.
"""
# Send handshake message
outbound_handshake = Message(
"handshake",
Handshake(
self._network_id,
protocol_version,
self._node_id,
uint16(self._port),
self._local_type,
),
)
try:
await connection.send(outbound_handshake)
# Read handshake message
full_message = await connection.read_one_message()
inbound_handshake = Handshake(**full_message.data)
if (full_message.function != "handshake" or not inbound_handshake
or not inbound_handshake.node_type):
raise ProtocolError(Err.INVALID_HANDSHAKE)
if inbound_handshake.node_id == self._node_id:
raise ProtocolError(Err.SELF_CONNECTION)
# Makes sure that we only start one connection with each peer
connection.node_id = inbound_handshake.node_id
connection.peer_server_port = int(inbound_handshake.server_port)
connection.connection_type = inbound_handshake.node_type
if not self.global_connections.add(connection):
raise ProtocolError(Err.DUPLICATE_CONNECTION, [False])
# Send Ack message
await connection.send(Message("handshake_ack", HandshakeAck()))
# Read Ack message
full_message = await connection.read_one_message()
if full_message.function != "handshake_ack":
raise ProtocolError(Err.INVALID_ACK)
if inbound_handshake.version != protocol_version:
raise ProtocolError(
Err.INCOMPATIBLE_PROTOCOL_VERSION,
[protocol_version, inbound_handshake.version],
)
self.log.info((
f"Handshake with {NodeType(connection.connection_type).name} {connection.get_peername()} "
f"{connection.node_id}"
f" established"))
# Only yield a connection if the handshake is succesful and the connection is not a duplicate.
yield connection
except (
ProtocolError,
asyncio.IncompleteReadError,
OSError,
Exception,
) as e:
self.log.warning(
f"{e}, handshake not completed. Connection not created.")
# Make sure to close the connection even if it's not in global connections
connection.close()
# Remove the conenction from global connections
self.global_connections.close(connection)