blob: 5f11f5d7456e7c1488a2dabe38a81a5a5f949eea [file] [log] [blame]
#!/usr/bin/env python3
"""
tdc.py - Linux tc (Traffic Control) unit test driver
Copyright (C) 2017 Lucas Bates <lucasb@mojatatu.com>
"""
import re
import os
import sys
import argparse
import json
import subprocess
from collections import OrderedDict
from string import Template
from tdc_config import *
from tdc_helper import *
USE_NS = True
def replace_keywords(cmd):
"""
For a given executable command, substitute any known
variables contained within NAMES with the correct values
"""
tcmd = Template(cmd)
subcmd = tcmd.safe_substitute(NAMES)
return subcmd
def exec_cmd(command, nsonly=True):
"""
Perform any required modifications on an executable command, then run
it in a subprocess and return the results.
"""
if (USE_NS and nsonly):
command = 'ip netns exec $NS ' + command
if '$' in command:
command = replace_keywords(command)
proc = subprocess.Popen(command,
shell=True,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
(rawout, serr) = proc.communicate()
if proc.returncode != 0:
foutput = serr.decode("utf-8")
else:
foutput = rawout.decode("utf-8")
proc.stdout.close()
proc.stderr.close()
return proc, foutput
def prepare_env(cmdlist):
"""
Execute the setup/teardown commands for a test case. Optionally
terminate test execution if the command fails.
"""
for cmdinfo in cmdlist:
if (type(cmdinfo) == list):
exit_codes = cmdinfo[1:]
cmd = cmdinfo[0]
else:
exit_codes = [0]
cmd = cmdinfo
if (len(cmd) == 0):
continue
(proc, foutput) = exec_cmd(cmd)
if proc.returncode not in exit_codes:
print
print("Could not execute:")
print(cmd)
print("\nError message:")
print(foutput)
print("\nAborting test run.")
ns_destroy()
exit(1)
def test_runner(filtered_tests, args):
"""
Driver function for the unit tests.
Prints information about the tests being run, executes the setup and
teardown commands and the command under test itself. Also determines
success/failure based on the information in the test case and generates
TAP output accordingly.
"""
testlist = filtered_tests
tcount = len(testlist)
index = 1
tap = str(index) + ".." + str(tcount) + "\n"
for tidx in testlist:
result = True
tresult = ""
if "flower" in tidx["category"] and args.device == None:
continue
print("Test " + tidx["id"] + ": " + tidx["name"])
prepare_env(tidx["setup"])
(p, procout) = exec_cmd(tidx["cmdUnderTest"])
exit_code = p.returncode
if (exit_code != int(tidx["expExitCode"])):
result = False
print("exit:", exit_code, int(tidx["expExitCode"]))
print(procout)
else:
match_pattern = re.compile(str(tidx["matchPattern"]), re.DOTALL)
(p, procout) = exec_cmd(tidx["verifyCmd"])
match_index = re.findall(match_pattern, procout)
if len(match_index) != int(tidx["matchCount"]):
result = False
if result == True:
tresult += "ok "
else:
tresult += "not ok "
tap += tresult + str(index) + " " + tidx["id"] + " " + tidx["name"] + "\n"
if result == False:
tap += procout
prepare_env(tidx["teardown"])
index += 1
return tap
def ns_create():
"""
Create the network namespace in which the tests will be run and set up
the required network devices for it.
"""
if (USE_NS):
cmd = 'ip netns add $NS'
exec_cmd(cmd, False)
cmd = 'ip link add $DEV0 type veth peer name $DEV1'
exec_cmd(cmd, False)
cmd = 'ip link set $DEV1 netns $NS'
exec_cmd(cmd, False)
cmd = 'ip link set $DEV0 up'
exec_cmd(cmd, False)
cmd = 'ip -s $NS link set $DEV1 up'
exec_cmd(cmd, False)
cmd = 'ip link set $DEV2 netns $NS'
exec_cmd(cmd, False)
cmd = 'ip -s $NS link set $DEV2 up'
exec_cmd(cmd, False)
def ns_destroy():
"""
Destroy the network namespace for testing (and any associated network
devices as well)
"""
if (USE_NS):
cmd = 'ip netns delete $NS'
exec_cmd(cmd, False)
def has_blank_ids(idlist):
"""
Search the list for empty ID fields and return true/false accordingly.
"""
return not(all(k for k in idlist))
def load_from_file(filename):
"""
Open the JSON file containing the test cases and return them as an
ordered dictionary object.
"""
with open(filename) as test_data:
testlist = json.load(test_data, object_pairs_hook=OrderedDict)
idlist = get_id_list(testlist)
if (has_blank_ids(idlist)):
for k in testlist:
k['filename'] = filename
return testlist
def args_parse():
"""
Create the argument parser.
"""
parser = argparse.ArgumentParser(description='Linux TC unit tests')
return parser
def set_args(parser):
"""
Set the command line arguments for tdc.
"""
parser.add_argument('-p', '--path', type=str,
help='The full path to the tc executable to use')
parser.add_argument('-c', '--category', type=str, nargs='?', const='+c',
help='Run tests only from the specified category, or if no category is specified, list known categories.')
parser.add_argument('-f', '--file', type=str,
help='Run tests from the specified file')
parser.add_argument('-l', '--list', type=str, nargs='?', const="", metavar='CATEGORY',
help='List all test cases, or those only within the specified category')
parser.add_argument('-s', '--show', type=str, nargs=1, metavar='ID', dest='showID',
help='Display the test case with specified id')
parser.add_argument('-e', '--execute', type=str, nargs=1, metavar='ID',
help='Execute the single test case with specified ID')
parser.add_argument('-i', '--id', action='store_true', dest='gen_id',
help='Generate ID numbers for new test cases')
parser.add_argument('-d', '--device',
help='Execute the test case in flower category')
return parser
def check_default_settings(args):
"""
Process any arguments overriding the default settings, and ensure the
settings are correct.
"""
# Allow for overriding specific settings
global NAMES
if args.path != None:
NAMES['TC'] = args.path
if args.device != None:
NAMES['DEV2'] = args.device
if not os.path.isfile(NAMES['TC']):
print("The specified tc path " + NAMES['TC'] + " does not exist.")
exit(1)
def get_id_list(alltests):
"""
Generate a list of all IDs in the test cases.
"""
return [x["id"] for x in alltests]
def check_case_id(alltests):
"""
Check for duplicate test case IDs.
"""
idl = get_id_list(alltests)
return [x for x in idl if idl.count(x) > 1]
def does_id_exist(alltests, newid):
"""
Check if a given ID already exists in the list of test cases.
"""
idl = get_id_list(alltests)
return (any(newid == x for x in idl))
def generate_case_ids(alltests):
"""
If a test case has a blank ID field, generate a random hex ID for it
and then write the test cases back to disk.
"""
import random
for c in alltests:
if (c["id"] == ""):
while True:
newid = str('%04x' % random.randrange(16**4))
if (does_id_exist(alltests, newid)):
continue
else:
c['id'] = newid
break
ufilename = []
for c in alltests:
if ('filename' in c):
ufilename.append(c['filename'])
ufilename = get_unique_item(ufilename)
for f in ufilename:
testlist = []
for t in alltests:
if 'filename' in t:
if t['filename'] == f:
del t['filename']
testlist.append(t)
outfile = open(f, "w")
json.dump(testlist, outfile, indent=4)
outfile.close()
def get_test_cases(args):
"""
If a test case file is specified, retrieve tests from that file.
Otherwise, glob for all json files in subdirectories and load from
each one.
"""
import fnmatch
if args.file != None:
if not os.path.isfile(args.file):
print("The specified test case file " + args.file + " does not exist.")
exit(1)
flist = [args.file]
else:
flist = []
for root, dirnames, filenames in os.walk('tc-tests'):
for filename in fnmatch.filter(filenames, '*.json'):
flist.append(os.path.join(root, filename))
alltests = list()
for casefile in flist:
alltests = alltests + (load_from_file(casefile))
return alltests
def set_operation_mode(args):
"""
Load the test case data and process remaining arguments to determine
what the script should do for this run, and call the appropriate
function.
"""
alltests = get_test_cases(args)
if args.gen_id:
idlist = get_id_list(alltests)
if (has_blank_ids(idlist)):
alltests = generate_case_ids(alltests)
else:
print("No empty ID fields found in test files.")
exit(0)
duplicate_ids = check_case_id(alltests)
if (len(duplicate_ids) > 0):
print("The following test case IDs are not unique:")
print(str(set(duplicate_ids)))
print("Please correct them before continuing.")
exit(1)
ucat = get_test_categories(alltests)
if args.showID:
show_test_case_by_id(alltests, args.showID[0])
exit(0)
if args.execute:
target_id = args.execute[0]
else:
target_id = ""
if args.category:
if (args.category == '+c'):
print("Available categories:")
print_sll(ucat)
exit(0)
else:
target_category = args.category
else:
target_category = ""
testcases = get_categorized_testlist(alltests, ucat)
if args.list:
if (len(args.list) == 0):
list_test_cases(alltests)
exit(0)
elif(len(args.list > 0)):
if (args.list not in ucat):
print("Unknown category " + args.list)
print("Available categories:")
print_sll(ucat)
exit(1)
list_test_cases(testcases[args.list])
exit(0)
if (os.geteuid() != 0):
print("This script must be run with root privileges.\n")
exit(1)
ns_create()
if (len(target_category) == 0):
if (len(target_id) > 0):
alltests = list(filter(lambda x: target_id in x['id'], alltests))
if (len(alltests) == 0):
print("Cannot find a test case with ID matching " + target_id)
exit(1)
catresults = test_runner(alltests, args)
print("All test results: " + "\n\n" + catresults)
elif (len(target_category) > 0):
if (target_category == "flower") and args.device == None:
print("Please specify a NIC device (-d) to run category flower")
exit(1)
if (target_category not in ucat):
print("Specified category is not present in this file.")
exit(1)
else:
catresults = test_runner(testcases[target_category], args)
print("Category " + target_category + "\n\n" + catresults)
ns_destroy()
def main():
"""
Start of execution; set up argument parser and get the arguments,
and start operations.
"""
parser = args_parse()
parser = set_args(parser)
(args, remaining) = parser.parse_known_args()
check_default_settings(args)
set_operation_mode(args)
exit(0)
if __name__ == "__main__":
main()