aboutsummaryrefslogtreecommitdiffstats
path: root/test/framework.py
blob: 008bda3b7ceb8e47eb0b70a5c5be950336acbab3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

@media only all and (prefers-color-scheme: dark) {
.highlight .hll { background-color: #49483e }
.highlight .c { color: #75715e } /* Comment */
.highlight .err { color: #960050; background-color: #1e0010 } /* Error */
.highlight .k { color: #66d9ef } /* Keyword */
.highlight .l { color: #ae81ff } /* Literal */
.highlight .n { color: #f8f8f2 } /* Name */
.highlight .o { color: #f92672 } /* Operator */
.highlight .p { color: #f8f8f2 } /* Punctuation */
.highlight .ch { color: #75715e } /* Comment.Hashbang */
.highlight .cm { color: #75715e } /* Comment.Multiline */
.highlight .cp { color: #75715e } /* Comment.Preproc */
.highlight .cpf { color: #75715e } /* Comment.PreprocFile */
.highlight .c1 { color: #75715e } /* Comment.Single */
.highlight .cs { color: #75715e } /* Comment.Special */
.highlight .gd { color: #f92672 } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gi { color: #a6e22e } /* Generic.Inserted */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #75715e } /* Generic.Subheading */
.highlight .kc { color: #66d9ef } /* Keyword.Constant */
.highlight .kd { color: #66d9ef } /* Keyword.Declaration */
.highlight .kn { color: #f92672 } /* Keyword.Namespace */
.highlight .kp { color: #66d9ef } /* Keyword.Pseudo */
.highlight .kr { color: #66d9ef } /* Keyword.Reserved */
.highlight .kt { color: #66d9ef } /* Keyword.Type */
.highlight .ld { color: #e6db74 } /* Literal.Date */
.highlight .m { color: #ae81ff } /* Literal.Number */
.highlight .s { color: #e6db74 } /* Literal.String */
.highlight .na { color: #a6e22e } /* Name.Attribute */
.highlight .nb { color: #f8f8f2 } /* Name.Builtin */
.highlight .nc { color: #a6e22e } /* Name.Class */
.highlight .no { color: #66d9ef } /* Name.Constant */
.highlight .nd { color: #a6e22e } /* Name.Decorator */
.highlight .ni { color: #f8f8f2 } /* Name.Entity */
.highlight .ne { color: #a6e22e } /* Name.Exception */
.highlight .nf { color: #a6e22e } /* Name.Function */
.highlight .nl { color: #f8f8f2 } /* Name.Label */
.highlight .nn { color: #f8f8f2 } /* Name.Namespace */
.highlight .nx { color: #a6e22e } /* Name.Other */
.highlight .py { color: #f8f8f2 } /* Name.Property */
.highlight .nt { color: #f92672 } /* Name.Tag */
.highlight .nv { color: #f8f8f2 } /* Name.Variable */
.highlight .ow { color: #f92672 } /* Operator.Word */
.highlight .w { color: #f8f8f2 } /* Text.Whitespace */
.highlight .mb { color: #ae81ff } /* Literal.Number.Bin */
.highlight .mf { color: #ae81ff } /* Literal.Number.Float */
.highlight .mh { color: #ae81ff } /* Literal.Number.Hex */
.highlight .mi { color: #ae81ff } /* Literal.Number.Integer */
.highlight .mo { color: #ae81ff } /* Literal.Number.Oct */
.highlight .sa { color: #e6db74 } /* Literal.String.Affix */
.highlight .sb { color: #e6db74 } /* Literal.String.Backtick */
.highlight .sc { color: #e6db74 } /* Literal.String.Char */
.highlight .dl { color: #e6db74 } /* Literal.String.Delimiter */
.highlight .sd { color: #e6db74 } /* Literal.String.Doc */
.highlight .s2 { color: #e6db74 } /* Literal.String.Double */
.highlight .se { color: #ae81ff } /* Literal.String.Escape */
.highlight .sh { color: #e6db74 } /* Literal.String.Heredoc */
.highlight .si { color: #e6db74 } /* Literal.String.Interpol */
.highlight .sx { color: #e6db74 } /* Literal.String.Other */
.highlight .sr { color: #e6db74 } /* Literal.String.Regex */
.highlight .s1 { color: #e6db74 } /* Literal.String.Single */
.highlight .ss { color: #e6db74 } /* Literal.String.Symbol */
.highlight .bp { color: #f8f8f2 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #a6e22e } /* Name.Function.Magic */
.highlight .vc { color: #f8f8f2 } /* Name.Variable.Class */
.highlight .vg { color: #f8f8f2 } /* Name.Variable.Global */
.highlight .vi { color: #f8f8f2 } /* Name.Variable.Instance */
.highlight .vm { color: #f8f8f2 } /* Name.Variable.Magic */
.highlight .il { color: #ae81ff } /* Literal.Number.Integer.Long */
}
@media (prefers-color-scheme: light) {
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */
.highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */
.highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */
.highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */
.highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */
.highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */
.highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */
.highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */
.highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */
.highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */
.highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */
.highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */
.highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */
.highlight .vc { color: #336699 } /* Name.Variable.Class */
.highlight .vg { color: #dd7700 } /* Name.Variable.Global */
.highlight .vi { color: #3333bb } /* Name.Variable.Instance */
.highlight .vm { color: #336699 } /* Name.Variable.Magic */
.highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
}
/*
 * mpls_error.def: mpls errors
 *
 * Copyright (c) 2012 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

mpls_error (NONE, "no error")
mpls_error (UNKNOWN_PROTOCOL, "unknown protocol")
mpls_error (UNSUPPORTED_VERSION, "unsupported version")
mpls_error (PKTS_DECAP, "MPLS input packets decapsulated")
mpls_error (PKTS_ENCAP, "MPLS output packets encapsulated")
mpls_error (NO_LABEL, "MPLS no label for fib/dst")
mpls_error (TTL_EXPIRED, "MPLS ttl expired")
mpls_error (S_NOT_SET, "MPLS s-bit not set")
mpls_error (BAD_LABEL, "invalid FIB id in label")
mpls_error (NOT_IP4, "non-ip4 packets dropped")
mpls_error (DISALLOWED_FIB, "disallowed FIB id")
mpls_error (NOT_ENABLED, "MPLS not enabled")
mpls_error (DROP, "MPLS DROP DPO")
mpls_error (PUNT, "MPLS PUNT DPO")
41 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017
#!/usr/bin/env python

from __future__ import print_function
import gc
import sys
import os
import select
import unittest
import tempfile
import time
import resource
import faulthandler
from collections import deque
from threading import Thread, Event
from inspect import getdoc, isclass
from traceback import format_exception
from logging import FileHandler, DEBUG, Formatter
from scapy.packet import Raw
from hook import StepHook, PollHook
from vpp_pg_interface import VppPGInterface
from vpp_sub_interface import VppSubInterface
from vpp_lo_interface import VppLoInterface
from vpp_papi_provider import VppPapiProvider
from log import *
from vpp_object import VppObjectRegistry
if os.name == 'posix' and sys.version_info[0] < 3:
    # using subprocess32 is recommended by python official documentation
    # @ https://docs.python.org/2/library/subprocess.html
    import subprocess32 as subprocess
else:
    import subprocess

"""
  Test framework module.

  The module provides a set of tools for constructing and running tests and
  representing the results.
"""


class _PacketInfo(object):
    """Private class to create packet info object.

    Help process information about the next packet.
    Set variables to default values.
    """
    #: Store the index of the packet.
    index = -1
    #: Store the index of the source packet generator interface of the packet.
    src = -1
    #: Store the index of the destination packet generator interface
    #: of the packet.
    dst = -1
    #: Store expected ip version
    ip = -1
    #: Store expected upper protocol
    proto = -1
    #: Store the copy of the former packet.
    data = None

    def __eq__(self, other):
        index = self.index == other.index
        src = self.src == other.src
        dst = self.dst == other.dst
        data = self.data == other.data
        return index and src and dst and data


def pump_output(testclass):
    """ pump output from vpp stdout/stderr to proper queues """
    while not testclass.pump_thread_stop_flag.wait(0):
        readable = select.select([testclass.vpp.stdout.fileno(),
                                  testclass.vpp.stderr.fileno(),
                                  testclass.pump_thread_wakeup_pipe[0]],
                                 [], [])[0]
        if testclass.vpp.stdout.fileno() in readable:
            read = os.read(testclass.vpp.stdout.fileno(), 1024)
            testclass.vpp_stdout_deque.append(read)
        if testclass.vpp.stderr.fileno() in readable:
            read = os.read(testclass.vpp.stderr.fileno(), 1024)
            testclass.vpp_stderr_deque.append(read)
        # ignoring the dummy pipe here intentionally - the flag will take care
        # of properly terminating the loop


def running_extended_tests():
    try:
        s = os.getenv("EXTENDED_TESTS")
        return True if s.lower() in ("y", "yes", "1") else False
    except:
        return False
    return False


class KeepAliveReporter(object):
    """
    Singleton object which reports test start to parent process
    """
    _shared_state = {}

    def __init__(self):
        self.__dict__ = self._shared_state

    @property
    def pipe(self):
        return self._pipe

    @pipe.setter
    def pipe(self, pipe):
        if hasattr(self, '_pipe'):
            raise Exception("Internal error - pipe should only be set once.")
        self._pipe = pipe

    def send_keep_alive(self, test):
        """
        Write current test tmpdir & desc to keep-alive pipe to signal liveness
        """
        if self.pipe is None:
            # if not running forked..
            return

        if isclass(test):
            desc = test.__name__
        else:
            desc = test.shortDescription()
            if not desc:
                desc = str(test)

        self.pipe.send((desc, test.vpp_bin, test.tempdir))


class VppTestCase(unittest.TestCase):
    """This subclass is a base class for VPP test cases that are implemented as
    classes. It provides methods to create and run test case.
    """

    @property
    def packet_infos(self):
        """List of packet infos"""
        return self._packet_infos

    @classmethod
    def get_packet_count_for_if_idx(cls, dst_if_index):
        """Get the number of packet info for specified destination if index"""
        if dst_if_index in cls._packet_count_for_dst_if_idx:
            return cls._packet_count_for_dst_if_idx[dst_if_index]
        else:
            return 0

    @classmethod
    def instance(cls):
        """Return the instance of this testcase"""
        return cls.test_instance

    @classmethod
    def set_debug_flags(cls, d):
        cls.debug_core = False
        cls.debug_gdb = False
        cls.debug_gdbserver = False
        if d is None:
            return
        dl = d.lower()
        if dl == "core":
            cls.debug_core = True
        elif dl == "gdb":
            cls.debug_gdb = True
        elif dl == "gdbserver":
            cls.debug_gdbserver = True
        else:
            raise Exception("Unrecognized DEBUG option: '%s'" % d)

    @classmethod
    def setUpConstants(cls):
        """ Set-up the test case class based on environment variables """
        try:
            s = os.getenv("STEP")
            cls.step = True if s.lower() in ("y", "yes", "1") else False
        except:
            cls.step = False
        try:
            d = os.getenv("DEBUG")
        except:
            d = None
        cls.set_debug_flags(d)
        cls.vpp_bin = os.getenv('VPP_TEST_BIN', "vpp")
        cls.plugin_path = os.getenv('VPP_TEST_PLUGIN_PATH')
        cls.extern_plugin_path = os.getenv('EXTERN_PLUGINS')
        plugin_path = None
        if cls.plugin_path is not None:
            if cls.extern_plugin_path is not None:
                plugin_path = "%s:%s" % (
                    cls.plugin_path, cls.extern_plugin_path)
            else:
                plugin_path = cls.plugin_path
        elif cls.extern_plugin_path is not None:
            plugin_path = cls.extern_plugin_path
        debug_cli = ""
        if cls.step or cls.debug_gdb or cls.debug_gdbserver:
            debug_cli = "cli-listen localhost:5002"
        coredump_size = None
        try:
            size = os.getenv("COREDUMP_SIZE")
            if size is not None:
                coredump_size = "coredump-size %s" % size
        except:
            pass
        if coredump_size is None:
            coredump_size = "coredump-size unlimited"
        cls.vpp_cmdline = [cls.vpp_bin, "unix",
                           "{", "nodaemon", debug_cli, coredump_size, "}",
                           "api-trace", "{", "on", "}",
                           "api-segment", "{", "prefix", cls.shm_prefix, "}",
                           "plugins", "{", "plugin", "dpdk_plugin.so", "{",
                           "disable", "}", "}"]
        if plugin_path is not None:
            cls.vpp_cmdline.extend(["plugin_path", plugin_path])
        cls.logger.info("vpp_cmdline: %s" % cls.vpp_cmdline)

    @classmethod
    def wait_for_enter(cls):
        if cls.debug_gdbserver:
            print(double_line_delim)
            print("Spawned GDB server with PID: %d" % cls.vpp.pid)
        elif cls.debug_gdb:
            print(double_line_delim)
            print("Spawned VPP with PID: %d" % cls.vpp.pid)
        else:
            cls.logger.debug("Spawned VPP with PID: %d" % cls.vpp.pid)
            return
        print(single_line_delim)
        print("You can debug the VPP using e.g.:")
        if cls.debug_gdbserver:
            print("gdb " + cls.vpp_bin + " -ex 'target remote localhost:7777'")
            print("Now is the time to attach a gdb by running the above "
                  "command, set up breakpoints etc. and then resume VPP from "
                  "within gdb by issuing the 'continue' command")
        elif cls.debug_gdb:
            print("gdb " + cls.vpp_bin + " -ex 'attach %s'" % cls.vpp.pid)
            print("Now is the time to attach a gdb by running the above "
                  "command and set up breakpoints etc.")
        print(single_line_delim)
        raw_input("Press ENTER to continue running the testcase...")

    @classmethod
    def run_vpp(cls):
        cmdline = cls.vpp_cmdline

        if cls.debug_gdbserver:
            gdbserver = '/usr/bin/gdbserver'
            if not os.path.isfile(gdbserver) or \
                    not os.access(gdbserver, os.X_OK):
                raise Exception("gdbserver binary '%s' does not exist or is "
                                "not executable" % gdbserver)

            cmdline = [gdbserver, 'localhost:7777'] + cls.vpp_cmdline
            cls.logger.info("Gdbserver cmdline is %s", " ".join(cmdline))

        try:
            cls.vpp = subprocess.Popen(cmdline,
                                       stdout=subprocess.PIPE,
                                       stderr=subprocess.PIPE,
                                       bufsize=1)
        except Exception as e:
            cls.logger.critical("Couldn't start vpp: %s" % e)
            raise

        cls.wait_for_enter()

    @classmethod
    def setUpClass(cls):
        """
        Perform class setup before running the testcase
        Remove shared memory files, start vpp and connect the vpp-api
        """
        gc.collect()  # run garbage collection first
        cls.logger = getLogger(cls.__name__)
        cls.tempdir = tempfile.mkdtemp(
            prefix='vpp-unittest-%s-' % cls.__name__)
        cls.file_handler = FileHandler("%s/log.txt" % cls.tempdir)
        cls.file_handler.setFormatter(
            Formatter(fmt='%(asctime)s,%(msecs)03d %(message)s',
                      datefmt="%H:%M:%S"))
        cls.file_handler.setLevel(DEBUG)
        cls.logger.addHandler(cls.file_handler)
        cls.shm_prefix = cls.tempdir.split("/")[-1]
        os.chdir(cls.tempdir)
        cls.logger.info("Temporary dir is %s, shm prefix is %s",
                        cls.tempdir, cls.shm_prefix)
        cls.setUpConstants()
        cls.reset_packet_infos()
        cls._captures = []
        cls._zombie_captures = []
        cls.verbose = 0
        cls.vpp_dead = False
        cls.registry = VppObjectRegistry()
        cls.vpp_startup_failed = False
        cls.reporter = KeepAliveReporter()
        cls.reporter.send_keep_alive(cls)
        # need to catch exceptions here because if we raise, then the cleanup
        # doesn't get called and we might end with a zombie vpp
        try:
            cls.run_vpp()
            cls.vpp_stdout_deque = deque()
            cls.vpp_stderr_deque = deque()
            cls.pump_thread_stop_flag = Event()
            cls.pump_thread_wakeup_pipe = os.pipe()
            cls.pump_thread = Thread(target=pump_output, args=(cls,))
            cls.pump_thread.daemon = True
            cls.pump_thread.start()
            cls.vapi = VppPapiProvider(cls.shm_prefix, cls.shm_prefix, cls)
            if cls.step:
                hook = StepHook(cls)
            else:
                hook = PollHook(cls)
            cls.vapi.register_hook(hook)
            cls.sleep(0.1, "after vpp startup, before initial poll")
            try:
                hook.poll_vpp()
            except:
                cls.vpp_startup_failed = True
                cls.logger.critical(
                    "VPP died shortly after startup, check the"
                    " output to standard error for possible cause")
                raise
            try:
                cls.vapi.connect()
            except:
                if cls.debug_gdbserver:
                    print(colorize("You're running VPP inside gdbserver but "
                                   "VPP-API connection failed, did you forget "
                                   "to 'continue' VPP from within gdb?", RED))
                raise
        except:
            t, v, tb = sys.exc_info()
            try:
                cls.quit()
            except:
                pass
            raise t, v, tb

    @classmethod
    def quit(cls):
        """
        Disconnect vpp-api, kill vpp and cleanup shared memory files
        """
        if (cls.debug_gdbserver or cls.debug_gdb) and hasattr(cls, 'vpp'):
            cls.vpp.poll()
            if cls.vpp.returncode is None:
                print(double_line_delim)
                print("VPP or GDB server is still running")
                print(single_line_delim)
                raw_input("When done debugging, press ENTER to kill the "
                          "process and finish running the testcase...")

        os.write(cls.pump_thread_wakeup_pipe[1], 'ding dong wake up')
        cls.pump_thread_stop_flag.set()
        if hasattr(cls, 'pump_thread'):
            cls.logger.debug("Waiting for pump thread to stop")
            cls.pump_thread.join()
        if hasattr(cls, 'vpp_stderr_reader_thread'):
            cls.logger.debug("Waiting for stdderr pump to stop")
            cls.vpp_stderr_reader_thread.join()

        if hasattr(cls, 'vpp'):
            if hasattr(cls, 'vapi'):
                cls.vapi.disconnect()
                del cls.vapi
            cls.vpp.poll()
            if cls.vpp.returncode is None:
                cls.logger.debug("Sending TERM to vpp")
                cls.vpp.terminate()
                cls.logger.debug("Waiting for vpp to die")
                cls.vpp.communicate()
            del cls.vpp

        if cls.vpp_startup_failed:
            stdout_log = cls.logger.info
            stderr_log = cls.logger.critical
        else:
            stdout_log = cls.logger.info
            stderr_log = cls.logger.info

        if hasattr(cls, 'vpp_stdout_deque'):
            stdout_log(single_line_delim)
            stdout_log('VPP output to stdout while running %s:', cls.__name__)
            stdout_log(single_line_delim)
            vpp_output = "".join(cls.vpp_stdout_deque)
            with open(cls.tempdir + '/vpp_stdout.txt', 'w') as f:
                f.write(vpp_output)
            stdout_log('\n%s', vpp_output)
            stdout_log(single_line_delim)

        if hasattr(cls, 'vpp_stderr_deque'):
            stderr_log(single_line_delim)
            stderr_log('VPP output to stderr while running %s:', cls.__name__)
            stderr_log(single_line_delim)
            vpp_output = "".join(cls.vpp_stderr_deque)
            with open(cls.tempdir + '/vpp_stderr.txt', 'w') as f:
                f.write(vpp_output)
            stderr_log('\n%s', vpp_output)
            stderr_log(single_line_delim)

    @classmethod
    def tearDownClass(cls):
        """ Perform final cleanup after running all tests in this test-case """
        cls.quit()
        cls.file_handler.close()

    def tearDown(self):
        """ Show various debug prints after each test """
        self.logger.debug("--- tearDown() for %s.%s(%s) called ---" %
                          (self.__class__.__name__, self._testMethodName,
                           self._testMethodDoc))
        if not self.vpp_dead:
            self.logger.debug(self.vapi.cli("show trace"))
            self.logger.info(self.vapi.ppcli("show interface"))
            self.logger.info(self.vapi.ppcli("show hardware"))
            self.logger.info(self.vapi.ppcli("show error"))
            self.logger.info(self.vapi.ppcli("show run"))
            self.registry.remove_vpp_config(self.logger)
            # Save/Dump VPP api trace log
            api_trace = "vpp_api_trace.%s.log" % self._testMethodName
            tmp_api_trace = "/tmp/%s" % api_trace
            vpp_api_trace_log = "%s/%s" % (self.tempdir, api_trace)
            self.logger.info(self.vapi.ppcli("api trace save %s" % api_trace))
            self.logger.info("Moving %s to %s\n" % (tmp_api_trace,
                                                    vpp_api_trace_log))
            os.rename(tmp_api_trace, vpp_api_trace_log)
            self.logger.info(self.vapi.ppcli("api trace dump %s" %
                                             vpp_api_trace_log))
        else:
            self.registry.unregister_all(self.logger)

    def setUp(self):
        """ Clear trace before running each test"""
        self.reporter.send_keep_alive(self)
        self.logger.debug("--- setUp() for %s.%s(%s) called ---" %
                          (self.__class__.__name__, self._testMethodName,
                           self._testMethodDoc))
        if self.vpp_dead:
            raise Exception("VPP is dead when setting up the test")
        self.sleep(.1, "during setUp")
        self.vpp_stdout_deque.append(
            "--- test setUp() for %s.%s(%s) starts here ---\n" %
            (self.__class__.__name__, self._testMethodName,
             self._testMethodDoc))
        self.vpp_stderr_deque.append(
            "--- test setUp() for %s.%s(%s) starts here ---\n" %
            (self.__class__.__name__, self._testMethodName,
             self._testMethodDoc))
        self.vapi.cli("clear trace")
        # store the test instance inside the test class - so that objects
        # holding the class can access instance methods (like assertEqual)
        type(self).test_instance = self

    @classmethod
    def pg_enable_capture(cls, interfaces):
        """
        Enable capture on packet-generator interfaces

        :param interfaces: iterable interface indexes

        """
        for i in interfaces:
            i.enable_capture()

    @classmethod
    def register_capture(cls, cap_name):
        """ Register a capture in the testclass """
        # add to the list of captures with current timestamp
        cls._captures.append((time.time(), cap_name))
        # filter out from zombies
        cls._zombie_captures = [(stamp, name)
                                for (stamp, name) in cls._zombie_captures
                                if name != cap_name]

    @classmethod
    def pg_start(cls):
        """ Remove any zombie captures and enable the packet generator """
        # how long before capture is allowed to be deleted - otherwise vpp
        # crashes - 100ms seems enough (this shouldn't be needed at all)
        capture_ttl = 0.1
        now = time.time()
        for stamp, cap_name in cls._zombie_captures:
            wait = stamp + capture_ttl - now
            if wait > 0:
                cls.sleep(wait, "before deleting capture %s" % cap_name)
                now = time.time()
            cls.logger.debug("Removing zombie capture %s" % cap_name)
            cls.vapi.cli('packet-generator delete %s' % cap_name)

        cls.vapi.cli("trace add pg-input 50")  # 50 is maximum
        cls.vapi.cli('packet-generator enable')
        cls._zombie_captures = cls._captures
        cls._captures = []

    @classmethod
    def create_pg_interfaces(cls, interfaces):
        """
        Create packet-generator interfaces.

        :param interfaces: iterable indexes of the interfaces.
        :returns: List of created interfaces.

        """
        result = []
        for i in interfaces:
            intf = VppPGInterface(cls, i)
            setattr(cls, intf.name, intf)
            result.append(intf)
        cls.pg_interfaces = result
        return result

    @classmethod
    def create_loopback_interfaces(cls, interfaces):
        """
        Create loopback interfaces.

        :param interfaces: iterable indexes of the interfaces.
        :returns: List of created interfaces.
        """
        result = []
        for i in interfaces:
            intf = VppLoInterface(cls, i)
            setattr(cls, intf.name, intf)
            result.append(intf)
        cls.lo_interfaces = result
        return result

    @staticmethod
    def extend_packet(packet, size):
        """
        Extend packet to given size by padding with spaces
        NOTE: Currently works only when Raw layer is present.

        :param packet: packet
        :param size: target size

        """
        packet_len = len(packet) + 4
        extend = size - packet_len
        if extend > 0:
            packet[Raw].load += ' ' * extend

    @classmethod
    def reset_packet_infos(cls):
        """ Reset the list of packet info objects and packet counts to zero """
        cls._packet_infos = {}
        cls._packet_count_for_dst_if_idx = {}

    @classmethod
    def create_packet_info(cls, src_if, dst_if):
        """
        Create packet info object containing the source and destination indexes
        and add it to the testcase's packet info list

        :param VppInterface src_if: source interface
        :param VppInterface dst_if: destination interface

        :returns: _PacketInfo object

        """
        info = _PacketInfo()
        info.index = len(cls._packet_infos)
        info.src = src_if.sw_if_index
        info.dst = dst_if.sw_if_index
        if isinstance(dst_if, VppSubInterface):
            dst_idx = dst_if.parent.sw_if_index
        else:
            dst_idx = dst_if.sw_if_index
        if dst_idx in cls._packet_count_for_dst_if_idx:
            cls._packet_count_for_dst_if_idx[dst_idx] += 1
        else:
            cls._packet_count_for_dst_if_idx[dst_idx] = 1
        cls._packet_infos[info.index] = info
        return info

    @staticmethod
    def info_to_payload(info):
        """
        Convert _PacketInfo object to packet payload

        :param info: _PacketInfo object

        :returns: string containing serialized data from packet info
        """
        return "%d %d %d %d %d" % (info.index, info.src, info.dst,
                                   info.ip, info.proto)

    @staticmethod
    def payload_to_info(payload):
        """
        Convert packet payload to _PacketInfo object

        :param payload: packet payload

        :returns: _PacketInfo object containing de-serialized data from payload

        """
        numbers = payload.split()
        info = _PacketInfo()
        info.index = int(numbers[0])
        info.src = int(numbers[1])
        info.dst = int(numbers[2])
        info.ip = int(numbers[3])
        info.proto = int(numbers[4])
        return info

    def get_next_packet_info(self, info):
        """
        Iterate over the packet info list stored in the testcase
        Start iteration with first element if info is None
        Continue based on index in info if info is specified

        :param info: info or None
        :returns: next info in list or None if no more infos
        """
        if info is None:
            next_index = 0
        else:
            next_index = info.index + 1
        if next_index == len(self._packet_infos):
            return None
        else:
            return self._packet_infos[next_index]

    def get_next_packet_info_for_interface(self, src_index, info):
        """
        Search the packet info list for the next packet info with same source
        interface index

        :param src_index: source interface index to search for
        :param info: packet info - where to start the search
        :returns: packet info or None

        """
        while True:
            info = self.get_next_packet_info(info)
            if info is None:
                return None
            if info.src == src_index:
                return info

    def get_next_packet_info_for_interface2(self, src_index, dst_index, info):
        """
        Search the packet info list for the next packet info with same source
        and destination interface indexes

        :param src_index: source interface index to search for
        :param dst_index: destination interface index to search for
        :param info: packet info - where to start the search
        :returns: packet info or None

        """
        while True:
            info = self.get_next_packet_info_for_interface(src_index, info)
            if info is None:
                return None
            if info.dst == dst_index:
                return info

    def assert_equal(self, real_value, expected_value, name_or_class=None):
        if name_or_class is None:
            self.assertEqual(real_value, expected_value)
            return
        try:
            msg = "Invalid %s: %d('%s') does not match expected value %d('%s')"
            msg = msg % (getdoc(name_or_class).strip(),
                         real_value, str(name_or_class(real_value)),
                         expected_value, str(name_or_class(expected_value)))
        except:
            msg = "Invalid %s: %s does not match expected value %s" % (
                name_or_class, real_value, expected_value)

        self.assertEqual(real_value, expected_value, msg)

    def assert_in_range(self,
                        real_value,
                        expected_min,
                        expected_max,
                        name=None):
        if name is None:
            msg = None
        else:
            msg = "Invalid %s: %s out of range <%s,%s>" % (
                name, real_value, expected_min, expected_max)
        self.assertTrue(expected_min <= real_value <= expected_max, msg)

    @classmethod
    def sleep(cls, timeout, remark=None):
        if hasattr(cls, 'logger'):
            cls.logger.debug("Starting sleep for %ss (%s)" % (timeout, remark))
        before = time.time()
        time.sleep(timeout)
        after = time.time()
        if after - before > 2 * timeout:
            cls.logger.error("unexpected time.sleep() result - "
                             "slept for %ss instead of ~%ss!" % (
                                 after - before, timeout))
        if hasattr(cls, 'logger'):
            cls.logger.debug(
                "Finished sleep (%s) - slept %ss (wanted %ss)" % (
                    remark, after - before, timeout))


class TestCasePrinter(object):
    _shared_state = {}

    def __init__(self):
        self.__dict__ = self._shared_state
        if not hasattr(self, "_test_case_set"):
            self._test_case_set = set()

    def print_test_case_heading_if_first_time(self, case):
        if case.__class__ not in self._test_case_set:
            print(double_line_delim)
            print(colorize(getdoc(case.__class__).splitlines()[0], YELLOW))
            print(double_line_delim)
            self._test_case_set.add(case.__class__)


class VppTestResult(unittest.TestResult):
    """
    @property result_string
     String variable to store the test case result string.
    @property errors
     List variable containing 2-tuples of TestCase instances and strings
     holding formatted tracebacks. Each tuple represents a test which
     raised an unexpected exception.
    @property failures
     List variable containing 2-tuples of TestCase instances and strings
     holding formatted tracebacks. Each tuple represents a test where
     a failure was explicitly signalled using the TestCase.assert*()
     methods.
    """

    def __init__(self, stream, descriptions, verbosity):
        """
        :param stream File descriptor to store where to report test results.
            Set to the standard error stream by default.
        :param descriptions Boolean variable to store information if to use
            test case descriptions.
        :param verbosity Integer variable to store required verbosity level.
        """
        unittest.TestResult.__init__(self, stream, descriptions, verbosity)
        self.stream = stream
        self.descriptions = descriptions
        self.verbosity = verbosity
        self.result_string = None
        self.printer = TestCasePrinter()

    def addSuccess(self, test):
        """
        Record a test succeeded result

        :param test:

        """
        if hasattr(test, 'logger'):
            test.logger.debug("--- addSuccess() %s.%s(%s) called"
                              % (test.__class__.__name__,
                                 test._testMethodName,
                                 test._testMethodDoc))
        unittest.TestResult.addSuccess(self, test)
        self.result_string = colorize("OK", GREEN)

    def addSkip(self, test, reason):
        """
        Record a test skipped.

        :param test:
        :param reason:

        """
        if hasattr(test, 'logger'):
            test.logger.debug("--- addSkip() %s.%s(%s) called, reason is %s"
                              % (test.__class__.__name__,
                                 test._testMethodName,
                                 test._testMethodDoc,
                                 reason))
        unittest.TestResult.addSkip(self, test, reason)
        self.result_string = colorize("SKIP", YELLOW)

    def symlink_failed(self, test):
        logger = None
        if hasattr(test, 'logger'):
            logger = test.logger
        if hasattr(test, 'tempdir'):
            try:
                failed_dir = os.getenv('VPP_TEST_FAILED_DIR')
                link_path = '%s/%s-FAILED' % (failed_dir,
                                              test.tempdir.split("/")[-1])
                if logger:
                    logger.debug("creating a link to the failed test")
                    logger.debug("os.symlink(%s, %s)" %
                                 (test.tempdir, link_path))
                os.symlink(test.tempdir, link_path)
            except Exception as e:
                if logger:
                    logger.error(e)

    def addFailure(self, test, err):
        """
        Record a test failed result

        :param test:
        :param err: error message

        """
        if hasattr(test, 'logger'):
            test.logger.debug("--- addFailure() %s.%s(%s) called, err is %s"
                              % (test.__class__.__name__,
                                 test._testMethodName,
                                 test._testMethodDoc, err))
            test.logger.debug("formatted exception is:\n%s" %
                              "".join(format_exception(*err)))
        unittest.TestResult.addFailure(self, test, err)
        if hasattr(test, 'tempdir'):
            self.result_string = colorize("FAIL", RED) + \
                ' [ temp dir used by test case: ' + test.tempdir + ' ]'
            self.symlink_failed(test)
        else:
            self.result_string = colorize("FAIL", RED) + ' [no temp dir]'

    def addError(self, test, err):
        """
        Record a test error result

        :param test:
        :param err: error message

        """
        if hasattr(test, 'logger'):
            test.logger.debug("--- addError() %s.%s(%s) called, err is %s"
                              % (test.__class__.__name__,
                                 test._testMethodName,
                                 test._testMethodDoc, err))
            test.logger.debug("formatted exception is:\n%s" %
                              "".join(format_exception(*err)))
        unittest.TestResult.addError(self, test, err)
        if hasattr(test, 'tempdir'):
            self.result_string = colorize("ERROR", RED) + \
                ' [ temp dir used by test case: ' + test.tempdir + ' ]'
            self.symlink_failed(test)
        else:
            self.result_string = colorize("ERROR", RED) + ' [no temp dir]'

    def getDescription(self, test):
        """
        Get test description

        :param test:
        :returns: test description

        """
        # TODO: if none print warning not raise exception
        short_description = test.shortDescription()
        if self.descriptions and short_description:
            return short_description
        else:
            return str(test)

    def startTest(self, test):
        """
        Start a test

        :param test:

        """
        self.printer.print_test_case_heading_if_first_time(test)
        unittest.TestResult.startTest(self, test)
        if self.verbosity > 0:
            self.stream.writeln(
                "Starting " + self.getDescription(test) + " ...")
            self.stream.writeln(single_line_delim)

    def stopTest(self, test):
        """
        Stop a test

        :param test:

        """
        unittest.TestResult.stopTest(self, test)
        if self.verbosity > 0:
            self.stream.writeln(single_line_delim)
            self.stream.writeln("%-73s%s" % (self.getDescription(test),
                                             self.result_string))
            self.stream.writeln(single_line_delim)
        else:
            self.stream.writeln("%-73s%s" % (self.getDescription(test),
                                             self.result_string))

    def printErrors(self):
        """
        Print errors from running the test case
        """
        self.stream.writeln()
        self.printErrorList('ERROR', self.errors)
        self.printErrorList('FAIL', self.failures)

    def printErrorList(self, flavour, errors):
        """
        Print error list to the output stream together with error type
        and test case description.

        :param flavour: error type
        :param errors: iterable errors

        """
        for test, err in errors:
            self.stream.writeln(double_line_delim)
            self.stream.writeln("%s: %s" %
                                (flavour, self.getDescription(test)))
            self.stream.writeln(single_line_delim)
            self.stream.writeln("%s" % err)


class VppTestRunner(unittest.TextTestRunner):
    """
    A basic test runner implementation which prints results to standard error.
    """
    @property
    def resultclass(self):
        """Class maintaining the results of the tests"""
        return VppTestResult

    def __init__(self, pipe=None, stream=sys.stderr, descriptions=True,
                 verbosity=1, failfast=False, buffer=False, resultclass=None):
        # ignore stream setting here, use hard-coded stdout to be in sync
        # with prints from VppTestCase methods ...
        super(VppTestRunner, self).__init__(sys.stdout, descriptions,
                                            verbosity, failfast, buffer,
                                            resultclass)
        reporter = KeepAliveReporter()
        reporter.pipe = pipe

    test_option = "TEST"

    def parse_test_option(self):
        try:
            f = os.getenv(self.test_option)
        except:
            f = None
        filter_file_name = None
        filter_class_name = None
        filter_func_name = None
        if f:
            if '.' in f:
                parts = f.split('.')
                if len(parts) > 3:
                    raise Exception("Unrecognized %s option: %s" %
                                    (self.test_option, f))
                if len(parts) > 2:
                    if parts[2] not in ('*', ''):
                        filter_func_name = parts[2]
                if parts[1] not in ('*', ''):
                    filter_class_name = parts[1]
                if parts[0] not in ('*', ''):
                    if parts[0].startswith('test_'):
                        filter_file_name = parts[0]
                    else:
                        filter_file_name = 'test_%s' % parts[0]
            else:
                if f.startswith('test_'):
                    filter_file_name = f
                else:
                    filter_file_name = 'test_%s' % f
        return filter_file_name, filter_class_name, filter_func_name

    def filter_tests(self, tests, filter_file, filter_class, filter_func):
        result = unittest.suite.TestSuite()
        for t in tests:
            if isinstance(t, unittest.suite.TestSuite):
                # this is a bunch of tests, recursively filter...
                x = self.filter_tests(t, filter_file, filter_class,
                                      filter_func)
                if x.countTestCases() > 0:
                    result.addTest(x)
            elif isinstance(t, unittest.TestCase):
                # this is a single test
                parts = t.id().split('.')
                # t.id() for common cases like this:
                # test_classifier.TestClassifier.test_acl_ip
                # apply filtering only if it is so
                if len(parts) == 3:
                    if filter_file and filter_file != parts[0]:
                        continue
                    if filter_class and filter_class != parts[1]:
                        continue
                    if filter_func and filter_func != parts[2]:
                        continue
                result.addTest(t)
            else:
                # unexpected object, don't touch it
                result.addTest(t)
        return result

    def run(self, test):
        """
        Run the tests

        :param test:

        """
        faulthandler.enable()  # emit stack trace to stderr if killed by signal
        print("Running tests using custom test runner")  # debug message
        filter_file, filter_class, filter_func = self.parse_test_option()
        print("Active filters: file=%s, class=%s, function=%s" % (
            filter_file, filter_class, filter_func))
        filtered = self.filter_tests(test, filter_file, filter_class,
                                     filter_func)
        print("%s out of %s tests match specified filters" % (
            filtered.countTestCases(), test.countTestCases()))
        if not running_extended_tests():
            print("Not running extended tests (some tests will be skipped)")
        return super(VppTestRunner, self).run(filtered)