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code_te_traffic_change_test.py
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code_te_traffic_change_test.py
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#!/usr/bin/env python
# -----------------------------------------------------------------
#
# TE optimisation module unit-test that checks that the optimise
# methods correctly update link traffic based on computed solution
# and preserve original link traffic if optimisation fails. The
# unit-tests also check the optimisation method paths.
#
# Run using the command:
# python -m unittest code_te_traffic_change_test.py
#
# -----------------------------------------------------------------
import copy
import unittest
import logging
from TE import TEOptimisation
from ShortestPath.dijkstra_te import Graph
from ShortestPath.protection_path_computation import group_table_to_path
# Imports used to spoof send and switch for rule extraction
import topo_discovery.api as topo_disc_api
from ryu.ofproto.ofproto_protocol import ProtocolDesc
from ryu.ofproto import ofproto_v1_3
from ryu.topology.switches import Switch
# ---------- OVERRIDE API CALLS USED BY CODE ----------
def send_dummy(req):
""" Fake send method used to attack to fake DPID object """
pass
def get_switch(self, dpid=None):
""" Fake get switch method that returns a fake switch object that dosen't
have a connection to a device. """
dummy_prot = ProtocolDesc(ofproto_v1_3.OFP_VERSION)
dummy_prot.id = dpid
dummy_prot.send_msg = send_dummy
dummy_obj = Switch(dummy_prot)
return[dummy_obj]
# XXX: Overwrite the get switch of the topology discovery API and finally import parent
topo_disc_api.get_switch = get_switch
from ProactiveController import ProactiveController
# --------------------------------------------------
def PTB(u, c=1000000000):
""" Convert usage a usage percentage `u` to bytes based on capacity `c` expressed in bits """
bits = float(c)*float(u)
byte = bits/8
return byte
class DummyCtrlCom:
""" Dummy controller communication class that stores info about congesed inter-dom links
that we can't and any ingress or egress changes. """
def __init__ (self, logger):
self.inter_dom_paths = {}
self.logger = logger
def set_inter_dom_path_instructions(self, inst):
self.inter_dom_paths = inst
def notify_inter_domain_congestion(self, sw, port, rate, path_keys):
pass
def notify_egress_change(self, hkey, new_egress):
raise Exception("DO NOT CALL METHOD")
def notify_ingress_change(self, hkey, old_ingress, new_ingress, old_egress, new_egress):
raise Exception("DO NOT CALL METHOD")
class DummyCtrl(ProactiveController):
TESTING_MODE = True
def __init__(self, topo, hosts, paths, logger, *args, **kwargs):
super(DummyCtrl, self).__init__(*args, **kwargs)
self.paths = copy.deepcopy(paths)
self.graph = Graph(topo)
self.logger = logger
self.ctrl_com = DummyCtrlCom(self.logger)
self.hosts = hosts
def is_master(self):
""" We are always the master controller """
return True
def get_poll_rate(self):
""" Always return the poll interval as 1 """
return 1
def _init_ing_change_wait(self, hkey):
""" Do not initiate the ingress change wait timer """
pass
def _install_protection(self):
raise Exception("DO NOT CALL METHOD")
def compute_path_segments(self, inter_dom_inst, inter_dom_links):
raise Exception("DO NOT CALL METHOD")
def ingress_change(self, hkey, sw, pn):
raise Exception("DO NOT CALL METHOD")
def te_optimisation(self, flow_demand_path, topo_traffic_path, over_util_path, inter_dom_links):
raise Exception("DO NOT CALL METHOD DIRRECTLY")
def is_inter_domain_link(self, sw, port):
res = super(DummyCtrl, self).is_inter_domain_link(sw, port)
self.logger.info("IS INTER DOM %s %s : %s" % (sw, port, res))
return res
class TEOptimisationTest(unittest.TestCase):
""" TE optimisation method unit test methods
Arguments:
DEFAULT_PATH (dict): Dictionary of default primary paths for two host pairs
DEFAULT_PATH_INFO (dict): Dictionary of default path information for the two host pairs
ctrl (DummyCtrl): Dummy controller object to test the TE module with
"""
DEFAULT_PATH = {
("src1", "dst"): [("s1", "s2", 5), ("s2", "dst", 1)],
("src2", "dst"): [("s1", "s2", 5), ("s2", "dst", 1)],
("src3", "dst"): [("s1", "s2", 5), ("s2", "dst", 1)],
("src4", "dst"): [("s1", "s2", 5), ("s2", "dst", 1)]
}
DEFAULT_PATH_INFO = {
("src1", "dst"): {
"gid": 1,
"eth": None, "address": None,
"ingress": "s1", "in_port": 1,
"egress": "s2", "out_port": 1,
"special_flows": {},
"groups": {"s1": [5, 6, 7, 8], "s2": [1], "s3": [2], "s4": [2], "s5": [2], "s6": [2]},
"stats": {"bytes": PTB(0.50)}
}, ("src2", "dst"): {
"gid": 2,
"eth": None, "address": None,
"ingress": "s1", "in_port": 2,
"egress": "s2", "out_port": 1,
"special_flows": {},
"groups": {"s1": [5, 6, 7, 8], "s2": [1], "s3": [2], "s4": [2], "s5": [2], "s6": [2]},
"stats": {"bytes": PTB(0.40)}
}, ("src3", "dst"): {
"gid": 3,
"eth": None, "address": None,
"ingress": "s1", "in_port": 3,
"egress": "s2", "out_port": 1,
"special_flows": {},
"groups": {"s1": [5, 6, 7, 8], "s2": [1], "s3": [2], "s4": [2], "s5": [2], "s6": [2]},
"stats": {"bytes": PTB(0.30)}
}, ("src4", "dst"): {
"gid": 4,
"eth": None, "address": None,
"ingress": "s1", "in_port": 4,
"egress": "s2", "out_port": 1,
"special_flows": {},
"groups": {"s1": [5, 6, 7, 8], "s2": [1], "s3": [2], "s4": [2], "s5": [2], "s6": [2]},
"stats": {"bytes": PTB(0.20)}
}
}
DEFAULT_LINK_TRAF = {
("s1", 5): PTB(14.0, c=100000000),
("s1", 6): PTB(0.20), ("s3", 2): PTB(0.20),
("s1", 7): PTB(0.10), ("s4", 2): PTB(0.10), ("s5", 2): PTB(0.10),
("s1", 8): PTB(0.15), ("s6", 2): PTB(0.15)
}
def setUp(self):
""" Define the default topology and initiate the controller """
# XXX: Note we define speed as 8G (instead of 1G) to make conversions to bits
# easier when converting usage from diagram to traffic bytes.
topo = {
"src1": {-1: {"dest": "s1", "destPort": 1, "speed": 1000000000}},
"src2": {-1: {"dest": "s1", "destPort": 2, "speed": 1000000000}},
"src3": {-1: {"dest": "s1", "destPort": 3, "speed": 1000000000}},
"src4": {-1: {"dest": "s1", "destPort": 4, "speed": 1000000000}},
"dst": {-1: {"dest": "s2", "destPort": 1, "speed": 1000000000}},
"s1": { 1: {"dest": "src1", "destPort": -1, "speed": 1000000000},
2: {"dest": "src2", "destPort": -1, "speed": 1000000000},
3: {"dest": "src3", "destPort": -1, "speed": 1000000000},
4: {"dest": "src4", "destPort": -1, "speed": 1000000000},
5: {"dest": "s2", "destPort": 2, "speed": 100000000, # CONSTRAIN TO 100Mb
"poll_stats": {"tx_bytes": PTB(14, c=100000000)}},
6: {"dest": "s3", "destPort": 1, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.20)}},
7: {"dest": "s4", "destPort": 1, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.10)}},
8: {"dest": "s6", "destPort": 1, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.15)}}},
"s2": { 1: {"dest": "dst", "destPort": -1, "speed": 1000000000,
"poll_stats": {"tx_bytes": 0}},
2: {"dest": "s1", "destPort": 3, "speed": 100000000}, # CONSTRAIN TO 100Mb
3: {"dest": "s3", "destPort": 2, "speed": 1000000000},
4: {"dest": "s5", "destPort": 2, "speed": 1000000000},
5: {"dest": "s6", "destPort": 2, "speed": 1000000000}},
"s3": { 1: {"dest": "s1", "destPort": 6, "speed": 1000000000},
2: {"dest": "s2", "destPort": 3, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.20)}}},
"s4": { 1: {"dest": "s1", "destPort": 7, "speed": 1000000000},
2: {"dest": "s5", "destPort": 1, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.10)}}},
"s5": { 1: {"dest": "s4", "destPort": 2, "speed": 1000000000},
2: {"dest": "s2", "destPort": 4, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.10)}}},
"s6": { 1: {"dest": "s1", "destPort": 8, "speed": 1000000000},
2: {"dest": "s2", "destPort": 5, "speed": 1000000000,
"poll_stats": {"tx_bytes": PTB(0.15)}}},
"dst": {-1: {"dest": "s2", "destPort": 1, "speed": 1000000000}}}
# Supress any logging by setting to a level above critical
logging.basicConfig(level=1000)
self.ctrl = DummyCtrl(topo, ["src1", "src2", "src3", "src4", "dst"], self.DEFAULT_PATH_INFO,
logging)
def test_case_00(self):
""" Default test case scenario that ensures check method works as expected """
print("\nTesting default controller state")
self._check_path()
self._check_traffic()
def test_case_01(self):
print("\nTesting FirstSol traffic change on success!")
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "FirstSol",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
self._check_path(
expected_path = {
("src1", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
("src2", "dst"): [("s1", "s4", 7), ("s4", "s5", 2), ("s5", "s2", 2), ("s2", "dst", 1)],
("src3", "dst"): [("s1", "s4", 7), ("s4", "s5", 2), ("s5", "s2", 2), ("s2", "dst", 1)],
("src4", "dst"): [("s1", "s6", 8), ("s6", "s2", 2), ("s2", "dst", 1)]
},
expected_path_info = {
("src1", "dst"): {"groups": {"s1": [6, 7, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src2", "dst"): {"groups": {"s1": [7, 6, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src3", "dst"): {"groups": {"s1": [7, 6, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src4", "dst"): {"groups": {"s1": [8, 6, 7, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}}
}
)
self._check_traffic(expected = {
("s1", 5): PTB(0),
("s1", 6): PTB(0.70), ("s3", 2): PTB(0.70),
("s1", 7): PTB(0.80), ("s4", 2): PTB(0.80), ("s5", 2): PTB(0.80),
("s1", 8): PTB(0.35), ("s6", 2): PTB(0.35)
})
def test_case_02(self):
print("\nTesting FirstSol no traffic change on failure")
# Constrain the s1-s6 link (used by the final candidate) to make the optimisation fail
self.ctrl.get_topo().topo["s1"][8]["speed"] = 100000000
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "FirstSol",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
# We expect no path changes and no traffic changes (failure)
self._check_path()
self._check_traffic()
def test_case_03(self):
print("\nTesting BestSolUsage traffic change on success!")
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "BestSolUsage",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
self._check_path(
expected_path = {
("src1", "dst"): [("s1", "s4", 7), ("s4", "s5", 2), ("s5", "s2", 2), ("s2", "dst", 1)],
("src2", "dst"): [("s1", "s6", 8), ("s6", "s2", 2), ("s2", "dst", 1)],
("src3", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
("src4", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
},
expected_path_info = {
("src1", "dst"): {"groups": {"s1": [7, 6, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src2", "dst"): {"groups": {"s1": [8, 6, 7, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src3", "dst"): {"groups": {"s1": [6, 7, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src4", "dst"): {"groups": {"s1": [6, 7, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
}
)
self._check_traffic(expected = {
("s1", 5): PTB(0),
("s1", 6): PTB(0.70), ("s3", 2): PTB(0.70),
("s1", 7): PTB(0.60), ("s4", 2): PTB(0.60), ("s5", 2): PTB(0.60),
("s1", 8): PTB(0.55), ("s6", 2): PTB(0.55)
})
def test_case_04(self):
print("\nTesting BestSolUsage no traffic change on failure")
# Constrain the s1-s6 link (used by the final candidate) to make the optimisation fail
self.ctrl.get_topo().topo["s1"][8]["speed"] = 100000000
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "BestSolUsage",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
# We expect no path changes and no traffic changes (failure)
self._check_path()
self._check_traffic()
def test_case_05(self):
print("\nTesting BestSolPLen traffic change on success!")
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "BestSolPLen",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
self._check_path(
expected_path = {
("src1", "dst"): [("s1", "s6", 8), ("s6", "s2", 2), ("s2", "dst", 1)],
("src2", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
("src3", "dst"): [("s1", "s4", 7), ("s4", "s5", 2), ("s5", "s2", 2), ("s2", "dst", 1)],
("src4", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
},
expected_path_info = {
("src1", "dst"): {"groups": {"s1": [8, 6, 7, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src2", "dst"): {"groups": {"s1": [6, 7, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src3", "dst"): {"groups": {"s1": [7, 6, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
("src4", "dst"): {"groups": {"s1": [6, 7, 8, 5], "s2": [1], "s3": [2], "s4": [2],
"s5": [2], "s6": [2]}},
}
)
self._check_traffic(expected = {
("s1", 5): PTB(0),
("s1", 6): PTB(0.80), ("s3", 2): PTB(0.80),
("s1", 7): PTB(0.40), ("s4", 2): PTB(0.40), ("s5", 2): PTB(0.40),
("s1", 8): PTB(0.65), ("s6", 2): PTB(0.65)
})
def test_case_06(self):
print("\nTesting BestSolPLen no traffic change on failure")
# Constrain the s1-s6 link (used by the final candidate) to make the optimisation fail
self.ctrl.get_topo().topo["s1"][8]["speed"] = 100000000
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "BestSolPLen",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
# We expect no path changes and no traffic changes (failure)
self._check_path()
self._check_traffic()
def test_case_07(self):
print("\nTesting CSPFRecomp traffic change on success!")
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "CSPFRecomp",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
self._check_path(
expected_path = {
("src1", "dst"): [("s1", "s3", 6), ("s3", "s2", 2), ("s2", "dst", 1)],
("src2", "dst"): [("s1", "s6", 8), ("s6", "s2", 2), ("s2", "dst", 1)],
("src3", "dst"): [("s1", "s4", 7), ("s4", "s5", 2), ("s5", "s2", 2), ("s2", "dst", 1)],
("src4", "dst"): [("s1", "s6", 8), ("s6", "s2", 2), ("s2", "dst", 1)],
},
expected_path_info = {
("src1", "dst"): {"groups": {"s1": [6, 5], "s2": [1], "s3": [2]}},
("src2", "dst"): {"groups": {"s1": [8, 5], "s2": [1], "s6": [2]}},
("src3", "dst"): {"groups": {"s1": [7, 5], "s2": [1], "s4": [2], "s5": [2]}},
("src4", "dst"): {"groups": {"s1": [8, 5], "s2": [1], "s6": [2]}},
}
)
self._check_traffic(expected = {
("s1", 5): PTB(0),
("s1", 6): PTB(0.70), ("s3", 2): PTB(0.70),
("s1", 7): PTB(0.40), ("s4", 2): PTB(0.40), ("s5", 2): PTB(0.40),
("s1", 8): PTB(0.75), ("s6", 2): PTB(0.75)
})
def test_case_08(self):
print("\nTesting CSPFRecomp no traffic change on failure")
# Constrain the s1-s6 link (used by the final candidate) to make the optimisation fail
self.ctrl.get_topo().topo["s1"][8]["speed"] = 100000000
self.TE = TEOptimisation(self.ctrl, 0.80, 0, opti_method = "CSPFRecomp",
candidate_sort_rev=True, pot_path_sort_rev=False)
self.TE.over_utilised = {("s1", 5): 14.0}
self.TE._optimise_TE()
# We expect no path changes and no traffic changes (failure)
self._check_path()
self._check_traffic()
# ---------- HELPER METHODS ----------
def _check_path(self, expected_path={}, expected_path_info={}, default_path=DEFAULT_PATH,
default_path_info=DEFAULT_PATH_INFO):
""" Assert that the path information dictionary and paths generatd by the groups table
are the same as `expected_path_info` and `expected_path`. Only the 'groups' field of
the path info dictionary is checked and other fields are ignored. If `defaul_path_info`
and `default_path` contain source-destination keys not found in `expected_path_info`
and `expected_path` respecitvely, the method checks the value from these dictionaries.
Args:
expected_path (dict): Expected path which differs from `default_path`. Format:
{(<src>, <dst>): [(<sw1>, <sw2>, <out_port>), ...]}
expected_path_info (dict): Expected path info which differs from `default_path_info`.
Format: {(<src>, <dst>): {"groups": {<sw>: [<pn>, ...]}}}
default_path (dict): Default path. Format same as `expected_path`.
default_path_info (dict): Default path info. Format same as `expected_path_info`.
"""
# Compare the expected groups with the controller path information
for hkey,expect_d in expected_path_info.iteritems():
self.assertIn(hkey, self.ctrl.paths, msg="Hkey %s-%s not in controller path info!" % hkey)
expect = expect_d["groups"]
target = self.ctrl.paths[hkey]["groups"]
self.assertEqual(target, expect, msg="Groups %s != %s for path %s-%s" % (target, expect,
hkey[0], hkey[1]))
# Compare the default groups with the controller path information
for hkey,expect_d in default_path_info.iteritems():
# Only check info of paths not in expected argument
if hkey not in expected_path_info:
self.assertIn(hkey, self.ctrl.paths, msg="Hkey %s-%s not in controller path info!" % hkey)
expect = expect_d["groups"]
target = self.ctrl.paths[hkey]["groups"]
self.assertEqual(target, expect, msg="Groups %s != %s for path of %s-%s" % (target, expect,
hkey[0], hkey[1]))
# Check the expected paths against the controller paths (group table)
for hkey,expect in expected_path.iteritems():
self.assertIn(hkey, self.ctrl.paths, msg="Hkey %s-%s not in controller path info!" % hkey)
target_pinfo = self.ctrl.paths[hkey]
target = group_table_to_path(target_pinfo, self.ctrl.get_topo(), target_pinfo["ingress"])
self.assertEqual(target, expect, "Path %s != %s for path %s-%s" % (target, expect, hkey[0],
hkey[1]))
# Check the default paths against the controller paths (group table)
for hkey,expect in default_path.iteritems():
# Only check paths which are not in the expected argument
if hkey not in expected_path:
self.assertIn(hkey, self.ctrl.paths, msg="Hkey %s-%s not in controller path info!" % hkey)
target_pinfo = self.ctrl.paths[hkey]
target = group_table_to_path(target_pinfo, self.ctrl.get_topo(), target_pinfo["ingress"])
self.assertEqual(target, expect, "Path %s != %s for path %s-%s" % (target, expect, hkey[0],
hkey[1]))
def _check_traffic(self, expected={}, default=DEFAULT_LINK_TRAF):
""" Assert that the link traffic (bytes) of the controller topology is correct. `expected`
defines a dictionary of link ports were we expect the 'poll_stats': 'bytes' fields to equal
that ammount. If `default` contains links that are not defined in `expected` the method
checks that the default value is present on the links.
Args:
expected (dict): Expected traffic on links which differ from `default`. Format:
{(<sw>, <port>): bytes, ...}
default (dict): Default traffic on links. Format is same as `expected`.
"""
topo = self.ctrl.get_topo().topo
# Compare the expected link traffic against the controller values
for link,expect in expected.iteritems():
self.assertIn(link[0], topo, msg="Switch %s dosen't exist in controller topo!" % link[0])
self.assertIn(link[1], topo[link[0]], msg="Switch %s dosen't contain port %s!" % link)
target = topo[link[0]][link[1]]["poll_stats"]["tx_bytes"]
self.assertEqual(expect, target, msg="Switch %s port %s bytes %s != %s" % (link[0], link[1],
target, expect))
# Compare the default link traffic against the controller values
for link,expect in default.iteritems():
# Only check if link is not in expected dictionary
if link not in expected:
self.assertIn(link[0], topo, msg="Switch %s dosen't exist in controller topo!" % link[0])
self.assertIn(link[1], topo[link[0]], msg="Switch %s dosen't contain port %s!" % link)
target = topo[link[0]][link[1]]["poll_stats"]["tx_bytes"]
self.assertEqual(expect, target, msg="Switch %s port %s bytes %s != %s" % (link[0], link[1],
target, expect))
# ----- Main method runner of unittest ----- #
if __name__ == "__main__":
unittest.main()