9225dee965
Introduce an API which asserts empty capture for interface. Throw exception in old API if the capture does not exist, thus making it clear if the test expects packets to arrive or not. Improve performance by not doing sleeps after starting the packet generator, rather lazily deleting captures when needed. Fix wrong usage of packet.show() in various tests. Change-Id: I456cb23316eef99b3f35f80344fe595c4db9a21c Signed-off-by: Klement Sekera <ksekera@cisco.com>
698 lines
23 KiB
Python
698 lines
23 KiB
Python
#!/usr/bin/env python
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import subprocess
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import unittest
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import tempfile
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import time
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import resource
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from collections import deque
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from threading import Thread
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from inspect import getdoc
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from hook import StepHook, PollHook
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from vpp_pg_interface import VppPGInterface
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from vpp_lo_interface import VppLoInterface
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from vpp_papi_provider import VppPapiProvider
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from scapy.packet import Raw
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from log import *
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"""
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Test framework module.
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The module provides a set of tools for constructing and running tests and
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representing the results.
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"""
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class _PacketInfo(object):
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"""Private class to create packet info object.
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Help process information about the next packet.
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Set variables to default values.
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"""
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#: Store the index of the packet.
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index = -1
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#: Store the index of the source packet generator interface of the packet.
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src = -1
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#: Store the index of the destination packet generator interface
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#: of the packet.
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dst = -1
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#: Store the copy of the former packet.
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data = None
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def __eq__(self, other):
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index = self.index == other.index
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src = self.src == other.src
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dst = self.dst == other.dst
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data = self.data == other.data
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return index and src and dst and data
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def pump_output(out, deque):
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for line in iter(out.readline, b''):
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deque.append(line)
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class VppTestCase(unittest.TestCase):
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"""This subclass is a base class for VPP test cases that are implemented as
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classes. It provides methods to create and run test case.
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"""
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@property
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def packet_infos(self):
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"""List of packet infos"""
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return self._packet_infos
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@packet_infos.setter
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def packet_infos(self, value):
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self._packet_infos = value
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@classmethod
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def instance(cls):
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"""Return the instance of this testcase"""
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return cls.test_instance
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@classmethod
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def set_debug_flags(cls, d):
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cls.debug_core = False
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cls.debug_gdb = False
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cls.debug_gdbserver = False
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if d is None:
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return
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dl = d.lower()
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if dl == "core":
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if resource.getrlimit(resource.RLIMIT_CORE)[0] <= 0:
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# give a heads up if this is actually useless
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cls.logger.critical("WARNING: core size limit is set 0, core "
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"files will NOT be created")
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cls.debug_core = True
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elif dl == "gdb":
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cls.debug_gdb = True
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elif dl == "gdbserver":
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cls.debug_gdbserver = True
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else:
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raise Exception("Unrecognized DEBUG option: '%s'" % d)
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@classmethod
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def setUpConstants(cls):
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""" Set-up the test case class based on environment variables """
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try:
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s = os.getenv("STEP")
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cls.step = True if s.lower() in ("y", "yes", "1") else False
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except:
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cls.step = False
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try:
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d = os.getenv("DEBUG")
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except:
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d = None
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cls.set_debug_flags(d)
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cls.vpp_bin = os.getenv('VPP_TEST_BIN', "vpp")
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cls.plugin_path = os.getenv('VPP_TEST_PLUGIN_PATH')
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debug_cli = ""
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if cls.step or cls.debug_gdb or cls.debug_gdbserver:
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debug_cli = "cli-listen localhost:5002"
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cls.vpp_cmdline = [cls.vpp_bin, "unix", "{", "nodaemon", debug_cli, "}",
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"api-segment", "{", "prefix", cls.shm_prefix, "}"]
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if cls.plugin_path is not None:
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cls.vpp_cmdline.extend(["plugin_path", cls.plugin_path])
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cls.logger.info("vpp_cmdline: %s" % cls.vpp_cmdline)
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@classmethod
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def wait_for_enter(cls):
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if cls.debug_gdbserver:
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print(double_line_delim)
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print("Spawned GDB server with PID: %d" % cls.vpp.pid)
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elif cls.debug_gdb:
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print(double_line_delim)
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print("Spawned VPP with PID: %d" % cls.vpp.pid)
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else:
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cls.logger.debug("Spawned VPP with PID: %d" % cls.vpp.pid)
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return
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print(single_line_delim)
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print("You can debug the VPP using e.g.:")
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if cls.debug_gdbserver:
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print("gdb " + cls.vpp_bin + " -ex 'target remote localhost:7777'")
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print("Now is the time to attach a gdb by running the above "
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"command, set up breakpoints etc. and then resume VPP from "
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"within gdb by issuing the 'continue' command")
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elif cls.debug_gdb:
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print("gdb " + cls.vpp_bin + " -ex 'attach %s'" % cls.vpp.pid)
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print("Now is the time to attach a gdb by running the above "
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"command and set up breakpoints etc.")
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print(single_line_delim)
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raw_input("Press ENTER to continue running the testcase...")
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@classmethod
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def run_vpp(cls):
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cmdline = cls.vpp_cmdline
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if cls.debug_gdbserver:
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gdbserver = '/usr/bin/gdbserver'
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if not os.path.isfile(gdbserver) or \
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not os.access(gdbserver, os.X_OK):
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raise Exception("gdbserver binary '%s' does not exist or is "
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"not executable" % gdbserver)
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cmdline = [gdbserver, 'localhost:7777'] + cls.vpp_cmdline
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cls.logger.info("Gdbserver cmdline is %s", " ".join(cmdline))
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try:
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cls.vpp = subprocess.Popen(cmdline,
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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE,
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bufsize=1)
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except Exception as e:
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cls.logger.critical("Couldn't start vpp: %s" % e)
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raise
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cls.wait_for_enter()
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@classmethod
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def setUpClass(cls):
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"""
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Perform class setup before running the testcase
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Remove shared memory files, start vpp and connect the vpp-api
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"""
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cls.logger = getLogger(cls.__name__)
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cls.tempdir = tempfile.mkdtemp(
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prefix='vpp-unittest-' + cls.__name__ + '-')
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cls.shm_prefix = cls.tempdir.split("/")[-1]
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os.chdir(cls.tempdir)
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cls.logger.info("Temporary dir is %s, shm prefix is %s",
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cls.tempdir, cls.shm_prefix)
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cls.setUpConstants()
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cls._captures = []
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cls._zombie_captures = []
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cls.packet_infos = {}
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cls.verbose = 0
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cls.vpp_dead = False
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print(double_line_delim)
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print(colorize(getdoc(cls).splitlines()[0], YELLOW))
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print(double_line_delim)
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# need to catch exceptions here because if we raise, then the cleanup
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# doesn't get called and we might end with a zombie vpp
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try:
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cls.run_vpp()
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cls.vpp_stdout_deque = deque()
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cls.vpp_stdout_reader_thread = Thread(target=pump_output, args=(
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cls.vpp.stdout, cls.vpp_stdout_deque))
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cls.vpp_stdout_reader_thread.start()
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cls.vpp_stderr_deque = deque()
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cls.vpp_stderr_reader_thread = Thread(target=pump_output, args=(
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cls.vpp.stderr, cls.vpp_stderr_deque))
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cls.vpp_stderr_reader_thread.start()
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cls.vapi = VppPapiProvider(cls.shm_prefix, cls.shm_prefix, cls)
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if cls.step:
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hook = StepHook(cls)
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else:
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hook = PollHook(cls)
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cls.vapi.register_hook(hook)
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time.sleep(0.1)
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hook.poll_vpp()
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try:
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cls.vapi.connect()
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except:
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if cls.debug_gdbserver:
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print(colorize("You're running VPP inside gdbserver but "
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"VPP-API connection failed, did you forget "
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"to 'continue' VPP from within gdb?", RED))
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raise
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except:
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t, v, tb = sys.exc_info()
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try:
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cls.quit()
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except:
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pass
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raise t, v, tb
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@classmethod
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def quit(cls):
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"""
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Disconnect vpp-api, kill vpp and cleanup shared memory files
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"""
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if (cls.debug_gdbserver or cls.debug_gdb) and hasattr(cls, 'vpp'):
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cls.vpp.poll()
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if cls.vpp.returncode is None:
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print(double_line_delim)
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print("VPP or GDB server is still running")
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print(single_line_delim)
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raw_input("When done debugging, press ENTER to kill the process"
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" and finish running the testcase...")
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if hasattr(cls, 'vpp'):
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if hasattr(cls, 'vapi'):
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cls.vapi.disconnect()
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cls.vpp.poll()
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if cls.vpp.returncode is None:
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cls.vpp.terminate()
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del cls.vpp
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if hasattr(cls, 'vpp_stdout_deque'):
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cls.logger.info(single_line_delim)
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cls.logger.info('VPP output to stdout while running %s:',
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cls.__name__)
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cls.logger.info(single_line_delim)
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f = open(cls.tempdir + '/vpp_stdout.txt', 'w')
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vpp_output = "".join(cls.vpp_stdout_deque)
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f.write(vpp_output)
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cls.logger.info('\n%s', vpp_output)
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cls.logger.info(single_line_delim)
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if hasattr(cls, 'vpp_stderr_deque'):
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cls.logger.info(single_line_delim)
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cls.logger.info('VPP output to stderr while running %s:',
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cls.__name__)
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cls.logger.info(single_line_delim)
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f = open(cls.tempdir + '/vpp_stderr.txt', 'w')
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vpp_output = "".join(cls.vpp_stderr_deque)
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f.write(vpp_output)
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cls.logger.info('\n%s', vpp_output)
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cls.logger.info(single_line_delim)
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@classmethod
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def tearDownClass(cls):
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""" Perform final cleanup after running all tests in this test-case """
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cls.quit()
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def tearDown(self):
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""" Show various debug prints after each test """
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if not self.vpp_dead:
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self.logger.debug(self.vapi.cli("show trace"))
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self.logger.info(self.vapi.ppcli("show int"))
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self.logger.info(self.vapi.ppcli("show hardware"))
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self.logger.info(self.vapi.ppcli("show error"))
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self.logger.info(self.vapi.ppcli("show run"))
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def setUp(self):
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""" Clear trace before running each test"""
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if self.vpp_dead:
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raise Exception("VPP is dead when setting up the test")
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time.sleep(.1)
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self.vpp_stdout_deque.append(
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"--- test setUp() for %s.%s(%s) starts here ---\n" %
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(self.__class__.__name__, self._testMethodName,
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self._testMethodDoc))
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self.vpp_stderr_deque.append(
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"--- test setUp() for %s.%s(%s) starts here ---\n" %
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(self.__class__.__name__, self._testMethodName,
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self._testMethodDoc))
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self.vapi.cli("clear trace")
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# store the test instance inside the test class - so that objects
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# holding the class can access instance methods (like assertEqual)
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type(self).test_instance = self
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@classmethod
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def pg_enable_capture(cls, interfaces):
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"""
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Enable capture on packet-generator interfaces
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:param interfaces: iterable interface indexes
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"""
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for i in interfaces:
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i.enable_capture()
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@classmethod
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def register_capture(cls, cap_name):
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""" Register a capture in the testclass """
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# add to the list of captures with current timestamp
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cls._captures.append((time.time(), cap_name))
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# filter out from zombies
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cls._zombie_captures = [(stamp, name)
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for (stamp, name) in cls._zombie_captures
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if name != cap_name]
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@classmethod
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def pg_start(cls):
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""" Remove any zombie captures and enable the packet generator """
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# how long before capture is allowed to be deleted - otherwise vpp
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# crashes - 100ms seems enough (this shouldn't be needed at all)
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capture_ttl = 0.1
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now = time.time()
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for stamp, cap_name in cls._zombie_captures:
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wait = stamp + capture_ttl - now
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if wait > 0:
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cls.logger.debug("Waiting for %ss before deleting capture %s",
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wait, cap_name)
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time.sleep(wait)
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now = time.time()
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cls.logger.debug("Removing zombie capture %s" % cap_name)
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cls.vapi.cli('packet-generator delete %s' % cap_name)
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cls.vapi.cli("trace add pg-input 50") # 50 is maximum
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cls.vapi.cli('packet-generator enable')
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cls._zombie_captures = cls._captures
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cls._captures = []
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@classmethod
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def create_pg_interfaces(cls, interfaces):
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"""
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Create packet-generator interfaces
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:param interfaces: iterable indexes of the interfaces
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"""
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result = []
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for i in interfaces:
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intf = VppPGInterface(cls, i)
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setattr(cls, intf.name, intf)
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result.append(intf)
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cls.pg_interfaces = result
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return result
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@classmethod
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def create_loopback_interfaces(cls, interfaces):
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"""
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Create loopback interfaces
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:param interfaces: iterable indexes of the interfaces
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"""
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result = []
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for i in interfaces:
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intf = VppLoInterface(cls, i)
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setattr(cls, intf.name, intf)
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result.append(intf)
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cls.lo_interfaces = result
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return result
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@staticmethod
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def extend_packet(packet, size):
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"""
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Extend packet to given size by padding with spaces
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NOTE: Currently works only when Raw layer is present.
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:param packet: packet
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:param size: target size
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"""
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packet_len = len(packet) + 4
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extend = size - packet_len
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if extend > 0:
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packet[Raw].load += ' ' * extend
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def add_packet_info_to_list(self, info):
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"""
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Add packet info to the testcase's packet info list
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:param info: packet info
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"""
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info.index = len(self.packet_infos)
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self.packet_infos[info.index] = info
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def create_packet_info(self, src_pg_index, dst_pg_index):
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"""
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Create packet info object containing the source and destination indexes
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and add it to the testcase's packet info list
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:param src_pg_index: source packet-generator index
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:param dst_pg_index: destination packet-generator index
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:returns: _PacketInfo object
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"""
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info = _PacketInfo()
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self.add_packet_info_to_list(info)
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info.src = src_pg_index
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info.dst = dst_pg_index
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return info
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@staticmethod
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def info_to_payload(info):
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"""
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Convert _PacketInfo object to packet payload
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:param info: _PacketInfo object
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:returns: string containing serialized data from packet info
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"""
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return "%d %d %d" % (info.index, info.src, info.dst)
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@staticmethod
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def payload_to_info(payload):
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"""
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Convert packet payload to _PacketInfo object
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:param payload: packet payload
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:returns: _PacketInfo object containing de-serialized data from payload
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"""
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numbers = payload.split()
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info = _PacketInfo()
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info.index = int(numbers[0])
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info.src = int(numbers[1])
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info.dst = int(numbers[2])
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return info
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def get_next_packet_info(self, info):
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"""
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Iterate over the packet info list stored in the testcase
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Start iteration with first element if info is None
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Continue based on index in info if info is specified
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:param info: info or None
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:returns: next info in list or None if no more infos
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"""
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if info is None:
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next_index = 0
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else:
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next_index = info.index + 1
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if next_index == len(self.packet_infos):
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return None
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else:
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return self.packet_infos[next_index]
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def get_next_packet_info_for_interface(self, src_index, info):
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"""
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Search the packet info list for the next packet info with same source
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interface index
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:param src_index: source interface index to search for
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:param info: packet info - where to start the search
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:returns: packet info or None
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"""
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while True:
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info = self.get_next_packet_info(info)
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if info is None:
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return None
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if info.src == src_index:
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return info
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def get_next_packet_info_for_interface2(self, src_index, dst_index, info):
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"""
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Search the packet info list for the next packet info with same source
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and destination interface indexes
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:param src_index: source interface index to search for
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:param dst_index: destination interface index to search for
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:param info: packet info - where to start the search
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:returns: packet info or None
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"""
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while True:
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info = self.get_next_packet_info_for_interface(src_index, info)
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if info is None:
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return None
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if info.dst == dst_index:
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return info
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def assert_equal(self, real_value, expected_value, name_or_class=None):
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if name_or_class is None:
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self.assertEqual(real_value, expected_value, msg)
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return
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try:
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msg = "Invalid %s: %d('%s') does not match expected value %d('%s')"
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msg = msg % (getdoc(name_or_class).strip(),
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real_value, str(name_or_class(real_value)),
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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)
|
|
|
|
|
|
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
|
|
|
|
def addSuccess(self, test):
|
|
"""
|
|
Record a test succeeded result
|
|
|
|
:param test:
|
|
|
|
"""
|
|
unittest.TestResult.addSuccess(self, test)
|
|
self.result_string = colorize("OK", GREEN)
|
|
|
|
def addSkip(self, test, reason):
|
|
"""
|
|
Record a test skipped.
|
|
|
|
:param test:
|
|
:param reason:
|
|
|
|
"""
|
|
unittest.TestResult.addSkip(self, test, reason)
|
|
self.result_string = colorize("SKIP", YELLOW)
|
|
|
|
def addFailure(self, test, err):
|
|
"""
|
|
Record a test failed result
|
|
|
|
:param test:
|
|
:param err: error message
|
|
|
|
"""
|
|
unittest.TestResult.addFailure(self, test, err)
|
|
if hasattr(test, 'tempdir'):
|
|
self.result_string = colorize("FAIL", RED) + \
|
|
' [ temp dir used by test case: ' + test.tempdir + ' ]'
|
|
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
|
|
|
|
"""
|
|
unittest.TestResult.addError(self, test, err)
|
|
if hasattr(test, 'tempdir'):
|
|
self.result_string = colorize("ERROR", RED) + \
|
|
' [ temp dir used by test case: ' + test.tempdir + ' ]'
|
|
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:
|
|
|
|
"""
|
|
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("%-60s%s" %
|
|
(self.getDescription(test), self.result_string))
|
|
self.stream.writeln(single_line_delim)
|
|
else:
|
|
self.stream.writeln("%-60s%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 on standard error.
|
|
"""
|
|
@property
|
|
def resultclass(self):
|
|
"""Class maintaining the results of the tests"""
|
|
return VppTestResult
|
|
|
|
def run(self, test):
|
|
"""
|
|
Run the tests
|
|
|
|
:param test:
|
|
|
|
"""
|
|
print("Running tests using custom test runner") # debug message
|
|
return super(VppTestRunner, self).run(test)
|