"""
Test cases for testing actions taken on packets

See basic.py for other info.

It is recommended that these definitions be kept in their own
namespace as different groups of tests will likely define 
similar identifiers.

  The function test_set_init is called with a complete configuration
dictionary prior to the invocation of any tests from this file.

  The switch is actively attempting to contact the controller at the address
indicated oin oft_config

"""

import logging

import unittest

import oftest.controller as controller
import oftest.cstruct as ofp
import oftest.message as message
import oftest.dataplane as dataplane
import oftest.action as action
import oftest.parse as parse
import basic

from testutils import *

#@var port_map Local copy of the configuration map from OF port
# numbers to OS interfaces
pa_port_map = None
#@var pa_logger Local logger object
pa_logger = None
#@var pa_config Local copy of global configuration data
pa_config = None

def test_set_init(config):
    """
    Set up function for packet action test classes

    @param config The configuration dictionary; see oft
    """

    global pa_port_map
    global pa_logger
    global pa_config

    pa_logger = logging.getLogger("pkt_act")
    pa_logger.info("Initializing test set")
    pa_port_map = config["port_map"]
    pa_config = config

class DirectPacket(basic.SimpleDataPlane):
    """
    Test case that checks single port direction action

    Generate a packet
    Generate and install a matching flow
    Add action to direct the packet to an egress port
    Send the packet to ingress dataplane port
    Verify the packet is received at the egress port only
    """
    def runTest(self):
        global pa_port_map
        of_ports = pa_port_map.keys()
        of_ports.sort()
        self.assertTrue(len(of_ports) > 1, "Not enough ports for test")

        rc = delete_all_flows(self.controller, pa_logger)
        self.assertEqual(rc, 0, "Failed to delete all flows")

        pkt = simple_tcp_packet()
        match = parse.packet_to_flow_match(pkt)
        self.assertTrue(match is not None, 
                        "Could not generate flow match from pkt")
        act = action.action_output()

        for idx in range(len(of_ports)):
            ingress_port = of_ports[idx]
            egress_port = of_ports[(idx + 1) % len(of_ports)]
            pa_logger.info("Ingress " + str(ingress_port) + 
                        " to egress " + str(egress_port))

            match.in_port = ingress_port

            request = message.flow_mod()
            request.match = match
            request.buffer_id = 0xffffffff
            act.port = egress_port
            self.assertTrue(request.actions.add(act), "Could not add action")

            pa_logger.info("Inserting flow")
            rv = self.controller.message_send(request)
            self.assertTrue(rv != -1, "Error installing flow mod")
            do_barrier(self.controller)

            pa_logger.info("Sending packet to dp port " + 
                           str(ingress_port))
            self.dataplane.send(ingress_port, str(pkt))
            (rcv_port, rcv_pkt, pkt_time) = self.dataplane.poll(timeout=1)
            self.assertTrue(rcv_pkt is not None, "Did not receive packet")
            pa_logger.debug("Packet len " + str(len(pkt)) + " in on " + 
                         str(rcv_port))
            self.assertEqual(rcv_port, egress_port, "Unexpected receive port")
            self.assertEqual(str(pkt), str(rcv_pkt),
                             'Response packet does not match send packet')