def send_echo(controller, switch):
"""Send echo request to a datapath.
Keep the connection alive through symmetric echoes.
"""
echo = EchoRequest(data=b'kytosd_10')
emit_message_out(controller, switch.connection, echo)
def update_flow_list(controller, switch):
"""Method responsible for request stats of flow to switches.
Args:
controller(:class:`~kytos.core.controller.Controller`):
the controller beeing used.
switch(:class:`~kytos.core.switch.Switch`):
target to send a stats request.
"""
body = FlowStatsRequest()
stats_request = StatsRequest(body_type=StatsTypes.OFPST_FLOW, body=body)
# req.pack()
emit_message_out(controller, switch.connection, stats_request)
def emit_message_out(self, connection, message):
"""Emit a KytosEvent for an outgoing message containing the message
and the destination."""
if connection.is_alive():
emit_message_out(self.controller, connection, message)
def say_hello(controller, connection):
"""Send back a Hello packet with the same version as the switch."""
hello = Hello()
emit_message_out(controller, connection, hello)
def send_set_config(controller, switch):
"""Send a SetConfig message after the OpenFlow handshake."""
set_config = SetConfig()
set_config.flags = ConfigFlags.OFPC_FRAG_NORMAL
set_config.miss_send_len = 0xffff #Send the whole packet
emit_message_out(controller, switch.connection, set_config)
def send_set_config(controller, switch):
"""Send a SetConfig message after the OpenFlow handshake."""
set_config = SetConfig()
set_config.flags = ConfigFlags.OFPC_FRAG_NORMAL
set_config.miss_send_len = ControllerMaxLen.OFPCML_NO_BUFFER
emit_message_out(controller, switch.connection, set_config)
def send_port_request(controller, connection):
"""Send a Port Description Request after the Features Reply."""
port_request = MultipartRequest()
port_request.multipart_type = MultipartTypes.OFPMP_PORT_DESC
emit_message_out(controller, connection, port_request)