blob: 05ff334761dd001cb283c08dde07f12f8a4e0635 [file] [log] [blame]
# SPDX-License-Identifier: GPL-2.0
#
# Parses KTAP test results from a kernel dmesg log and incrementally prints
# results with reader-friendly format. Stores and returns test results in a
# Test object.
#
# Copyright (C) 2019, Google LLC.
# Author: Felix Guo <felixguoxiuping@gmail.com>
# Author: Brendan Higgins <brendanhiggins@google.com>
# Author: Rae Moar <rmoar@google.com>
from __future__ import annotations
import re
import datetime
from enum import Enum, auto
from functools import reduce
from typing import Iterable, Iterator, List, Optional, Tuple
class Test(object):
"""
A class to represent a test parsed from KTAP results. All KTAP
results within a test log are stored in a main Test object as
subtests.
Attributes:
status : TestStatus - status of the test
name : str - name of the test
expected_count : int - expected number of subtests (0 if single
test case and None if unknown expected number of subtests)
subtests : List[Test] - list of subtests
log : List[str] - log of KTAP lines that correspond to the test
counts : TestCounts - counts of the test statuses and errors of
subtests or of the test itself if the test is a single
test case.
"""
def __init__(self) -> None:
"""Creates Test object with default attributes."""
self.status = TestStatus.TEST_CRASHED
self.name = ''
self.expected_count = 0 # type: Optional[int]
self.subtests = [] # type: List[Test]
self.log = [] # type: List[str]
self.counts = TestCounts()
def __str__(self) -> str:
"""Returns string representation of a Test class object."""
return ('Test(' + str(self.status) + ', ' + self.name +
', ' + str(self.expected_count) + ', ' +
str(self.subtests) + ', ' + str(self.log) + ', ' +
str(self.counts) + ')')
def __repr__(self) -> str:
"""Returns string representation of a Test class object."""
return str(self)
def add_error(self, error_message: str) -> None:
"""Records an error that occurred while parsing this test."""
self.counts.errors += 1
print_error('Test ' + self.name + ': ' + error_message)
class TestStatus(Enum):
"""An enumeration class to represent the status of a test."""
SUCCESS = auto()
FAILURE = auto()
SKIPPED = auto()
TEST_CRASHED = auto()
NO_TESTS = auto()
FAILURE_TO_PARSE_TESTS = auto()
class TestCounts:
"""
Tracks the counts of statuses of all test cases and any errors within
a Test.
Attributes:
passed : int - the number of tests that have passed
failed : int - the number of tests that have failed
crashed : int - the number of tests that have crashed
skipped : int - the number of tests that have skipped
errors : int - the number of errors in the test and subtests
"""
def __init__(self):
"""Creates TestCounts object with counts of all test
statuses and test errors set to 0.
"""
self.passed = 0
self.failed = 0
self.crashed = 0
self.skipped = 0
self.errors = 0
def __str__(self) -> str:
"""Returns the string representation of a TestCounts object.
"""
return ('Passed: ' + str(self.passed) +
', Failed: ' + str(self.failed) +
', Crashed: ' + str(self.crashed) +
', Skipped: ' + str(self.skipped) +
', Errors: ' + str(self.errors))
def total(self) -> int:
"""Returns the total number of test cases within a test
object, where a test case is a test with no subtests.
"""
return (self.passed + self.failed + self.crashed +
self.skipped)
def add_subtest_counts(self, counts: TestCounts) -> None:
"""
Adds the counts of another TestCounts object to the current
TestCounts object. Used to add the counts of a subtest to the
parent test.
Parameters:
counts - a different TestCounts object whose counts
will be added to the counts of the TestCounts object
"""
self.passed += counts.passed
self.failed += counts.failed
self.crashed += counts.crashed
self.skipped += counts.skipped
self.errors += counts.errors
def get_status(self) -> TestStatus:
"""Returns the aggregated status of a Test using test
counts.
"""
if self.total() == 0:
return TestStatus.NO_TESTS
elif self.crashed:
# If one of the subtests crash, the expected status
# of the Test is crashed.
return TestStatus.TEST_CRASHED
elif self.failed:
# Otherwise if one of the subtests fail, the
# expected status of the Test is failed.
return TestStatus.FAILURE
elif self.passed:
# Otherwise if one of the subtests pass, the
# expected status of the Test is passed.
return TestStatus.SUCCESS
else:
# Finally, if none of the subtests have failed,
# crashed, or passed, the expected status of the
# Test is skipped.
return TestStatus.SKIPPED
def add_status(self, status: TestStatus) -> None:
"""
Increments count of inputted status.
Parameters:
status - status to be added to the TestCounts object
"""
if status == TestStatus.SUCCESS:
self.passed += 1
elif status == TestStatus.FAILURE:
self.failed += 1
elif status == TestStatus.SKIPPED:
self.skipped += 1
elif status != TestStatus.NO_TESTS:
self.crashed += 1
class LineStream:
"""
A class to represent the lines of kernel output.
Provides a lazy peek()/pop() interface over an iterator of
(line#, text).
"""
_lines: Iterator[Tuple[int, str]]
_next: Tuple[int, str]
_need_next: bool
_done: bool
def __init__(self, lines: Iterator[Tuple[int, str]]):
"""Creates a new LineStream that wraps the given iterator."""
self._lines = lines
self._done = False
self._need_next = True
self._next = (0, '')
def _get_next(self) -> None:
"""Advances the LineSteam to the next line, if necessary."""
if not self._need_next:
return
try:
self._next = next(self._lines)
except StopIteration:
self._done = True
finally:
self._need_next = False
def peek(self) -> str:
"""Returns the current line, without advancing the LineStream.
"""
self._get_next()
return self._next[1]
def pop(self) -> str:
"""Returns the current line and advances the LineStream to
the next line.
"""
s = self.peek()
if self._done:
raise ValueError(f'LineStream: going past EOF, last line was {s}')
self._need_next = True
return s
def __bool__(self) -> bool:
"""Returns True if stream has more lines."""
self._get_next()
return not self._done
# Only used by kunit_tool_test.py.
def __iter__(self) -> Iterator[str]:
"""Empties all lines stored in LineStream object into
Iterator object and returns the Iterator object.
"""
while bool(self):
yield self.pop()
def line_number(self) -> int:
"""Returns the line number of the current line."""
self._get_next()
return self._next[0]
# Parsing helper methods:
KTAP_START = re.compile(r'KTAP version ([0-9]+)$')
TAP_START = re.compile(r'TAP version ([0-9]+)$')
KTAP_END = re.compile('(List of all partitions:|'
'Kernel panic - not syncing: VFS:|reboot: System halted)')
def extract_tap_lines(kernel_output: Iterable[str]) -> LineStream:
"""Extracts KTAP lines from the kernel output."""
def isolate_ktap_output(kernel_output: Iterable[str]) \
-> Iterator[Tuple[int, str]]:
line_num = 0
started = False
for line in kernel_output:
line_num += 1
line = line.rstrip() # remove trailing \n
if not started and KTAP_START.search(line):
# start extracting KTAP lines and set prefix
# to number of characters before version line
prefix_len = len(
line.split('KTAP version')[0])
started = True
yield line_num, line[prefix_len:]
elif not started and TAP_START.search(line):
# start extracting KTAP lines and set prefix
# to number of characters before version line
prefix_len = len(line.split('TAP version')[0])
started = True
yield line_num, line[prefix_len:]
elif started and KTAP_END.search(line):
# stop extracting KTAP lines
break
elif started:
# remove prefix and any indention and yield
# line with line number
line = line[prefix_len:].lstrip()
yield line_num, line
return LineStream(lines=isolate_ktap_output(kernel_output))
KTAP_VERSIONS = [1]
TAP_VERSIONS = [13, 14]
def check_version(version_num: int, accepted_versions: List[int],
version_type: str, test: Test) -> None:
"""
Adds error to test object if version number is too high or too
low.
Parameters:
version_num - The inputted version number from the parsed KTAP or TAP
header line
accepted_version - List of accepted KTAP or TAP versions
version_type - 'KTAP' or 'TAP' depending on the type of
version line.
test - Test object for current test being parsed
"""
if version_num < min(accepted_versions):
test.add_error(version_type +
' version lower than expected!')
elif version_num > max(accepted_versions):
test.add_error(
version_type + ' version higher than expected!')
def parse_ktap_header(lines: LineStream, test: Test) -> bool:
"""
Parses KTAP/TAP header line and checks version number.
Returns False if fails to parse KTAP/TAP header line.
Accepted formats:
- 'KTAP version [version number]'
- 'TAP version [version number]'
Parameters:
lines - LineStream of KTAP output to parse
test - Test object for current test being parsed
Return:
True if successfully parsed KTAP/TAP header line
"""
ktap_match = KTAP_START.match(lines.peek())
tap_match = TAP_START.match(lines.peek())
if ktap_match:
version_num = int(ktap_match.group(1))
check_version(version_num, KTAP_VERSIONS, 'KTAP', test)
elif tap_match:
version_num = int(tap_match.group(1))
check_version(version_num, TAP_VERSIONS, 'TAP', test)
else:
return False
test.log.append(lines.pop())
return True
TEST_HEADER = re.compile(r'^# Subtest: (.*)$')
def parse_test_header(lines: LineStream, test: Test) -> bool:
"""
Parses test header and stores test name in test object.
Returns False if fails to parse test header line.
Accepted format:
- '# Subtest: [test name]'
Parameters:
lines - LineStream of KTAP output to parse
test - Test object for current test being parsed
Return:
True if successfully parsed test header line
"""
match = TEST_HEADER.match(lines.peek())
if not match:
return False
test.log.append(lines.pop())
test.name = match.group(1)
return True
TEST_PLAN = re.compile(r'1\.\.([0-9]+)')
def parse_test_plan(lines: LineStream, test: Test) -> bool:
"""
Parses test plan line and stores the expected number of subtests in
test object. Reports an error if expected count is 0.
Returns False and sets expected_count to None if there is no valid test
plan.
Accepted format:
- '1..[number of subtests]'
Parameters:
lines - LineStream of KTAP output to parse
test - Test object for current test being parsed
Return:
True if successfully parsed test plan line
"""
match = TEST_PLAN.match(lines.peek())
if not match:
test.expected_count = None
return False
test.log.append(lines.pop())
expected_count = int(match.group(1))
test.expected_count = expected_count
return True
TEST_RESULT = re.compile(r'^(ok|not ok) ([0-9]+) (- )?([^#]*)( # .*)?$')
TEST_RESULT_SKIP = re.compile(r'^(ok|not ok) ([0-9]+) (- )?(.*) # SKIP(.*)$')
def peek_test_name_match(lines: LineStream, test: Test) -> bool:
"""
Matches current line with the format of a test result line and checks
if the name matches the name of the current test.
Returns False if fails to match format or name.
Accepted format:
- '[ok|not ok] [test number] [-] [test name] [optional skip
directive]'
Parameters:
lines - LineStream of KTAP output to parse
test - Test object for current test being parsed
Return:
True if matched a test result line and the name matching the
expected test name
"""
line = lines.peek()
match = TEST_RESULT.match(line)
if not match:
return False
name = match.group(4)
return (name == test.name)
def parse_test_result(lines: LineStream, test: Test,
expected_num: int) -> bool:
"""
Parses test result line and stores the status and name in the test
object. Reports an error if the test number does not match expected
test number.
Returns False if fails to parse test result line.
Note that the SKIP directive is the only direction that causes a
change in status.
Accepted format:
- '[ok|not ok] [test number] [-] [test name] [optional skip
directive]'
Parameters:
lines - LineStream of KTAP output to parse
test - Test object for current test being parsed
expected_num - expected test number for current test
Return:
True if successfully parsed a test result line.
"""
line = lines.peek()
match = TEST_RESULT.match(line)
skip_match = TEST_RESULT_SKIP.match(line)
# Check if line matches test result line format
if not match:
return False
test.log.append(lines.pop())
# Set name of test object
if skip_match:
test.name = skip_match.group(4)
else:
test.name = match.group(4)
# Check test num
num = int(match.group(2))
if num != expected_num:
test.add_error('Expected test number ' +
str(expected_num) + ' but found ' + str(num))
# Set status of test object
status = match.group(1)
if skip_match:
test.status = TestStatus.SKIPPED
elif status == 'ok':
test.status = TestStatus.SUCCESS
else:
test.status = TestStatus.FAILURE
return True
def parse_diagnostic(lines: LineStream) -> List[str]:
"""
Parse lines that do not match the format of a test result line or
test header line and returns them in list.
Line formats that are not parsed:
- '# Subtest: [test name]'
- '[ok|not ok] [test number] [-] [test name] [optional skip
directive]'
Parameters:
lines - LineStream of KTAP output to parse
Return:
Log of diagnostic lines
"""
log = [] # type: List[str]
while lines and not TEST_RESULT.match(lines.peek()) and not \
TEST_HEADER.match(lines.peek()):
log.append(lines.pop())
return log
DIAGNOSTIC_CRASH_MESSAGE = re.compile(r'^# .*?: kunit test case crashed!$')
def parse_crash_in_log(test: Test) -> bool:
"""
Iterate through the lines of the log to parse for crash message.
If crash message found, set status to crashed and return True.
Otherwise return False.
Parameters:
test - Test object for current test being parsed
Return:
True if crash message found in log
"""
for line in test.log:
if DIAGNOSTIC_CRASH_MESSAGE.match(line):
test.status = TestStatus.TEST_CRASHED
return True
return False
# Printing helper methods:
DIVIDER = '=' * 60
RESET = '\033[0;0m'
def red(text: str) -> str:
"""Returns inputted string with red color code."""
return '\033[1;31m' + text + RESET
def yellow(text: str) -> str:
"""Returns inputted string with yellow color code."""
return '\033[1;33m' + text + RESET
def green(text: str) -> str:
"""Returns inputted string with green color code."""
return '\033[1;32m' + text + RESET
ANSI_LEN = len(red(''))
def print_with_timestamp(message: str) -> None:
"""Prints message with timestamp at beginning."""
print('[%s] %s' % (datetime.datetime.now().strftime('%H:%M:%S'), message))
def format_test_divider(message: str, len_message: int) -> str:
"""
Returns string with message centered in fixed width divider.
Example:
'===================== message example ====================='
Parameters:
message - message to be centered in divider line
len_message - length of the message to be printed such that
any characters of the color codes are not counted
Return:
String containing message centered in fixed width divider
"""
default_count = 3 # default number of dashes
len_1 = default_count
len_2 = default_count
difference = len(DIVIDER) - len_message - 2 # 2 spaces added
if difference > 0:
# calculate number of dashes for each side of the divider
len_1 = int(difference / 2)
len_2 = difference - len_1
return ('=' * len_1) + ' ' + message + ' ' + ('=' * len_2)
def print_test_header(test: Test) -> None:
"""
Prints test header with test name and optionally the expected number
of subtests.
Example:
'=================== example (2 subtests) ==================='
Parameters:
test - Test object representing current test being printed
"""
message = test.name
if test.expected_count:
if test.expected_count == 1:
message += (' (' + str(test.expected_count) +
' subtest)')
else:
message += (' (' + str(test.expected_count) +
' subtests)')
print_with_timestamp(format_test_divider(message, len(message)))
def print_log(log: Iterable[str]) -> None:
"""
Prints all strings in saved log for test in yellow.
Parameters:
log - Iterable object with all strings saved in log for test
"""
for m in log:
print_with_timestamp(yellow(m))
def format_test_result(test: Test) -> str:
"""
Returns string with formatted test result with colored status and test
name.
Example:
'[PASSED] example'
Parameters:
test - Test object representing current test being printed
Return:
String containing formatted test result
"""
if test.status == TestStatus.SUCCESS:
return (green('[PASSED] ') + test.name)
elif test.status == TestStatus.SKIPPED:
return (yellow('[SKIPPED] ') + test.name)
elif test.status == TestStatus.NO_TESTS:
return (yellow('[NO TESTS RUN] ') + test.name)
elif test.status == TestStatus.TEST_CRASHED:
print_log(test.log)
return (red('[CRASHED] ') + test.name)
else:
print_log(test.log)
return (red('[FAILED] ') + test.name)
def print_test_result(test: Test) -> None:
"""
Prints result line with status of test.
Example:
'[PASSED] example'
Parameters:
test - Test object representing current test being printed
"""
print_with_timestamp(format_test_result(test))
def print_test_footer(test: Test) -> None:
"""
Prints test footer with status of test.
Example:
'===================== [PASSED] example ====================='
Parameters:
test - Test object representing current test being printed
"""
message = format_test_result(test)
print_with_timestamp(format_test_divider(message,
len(message) - ANSI_LEN))
def print_summary_line(test: Test) -> None:
"""
Prints summary line of test object. Color of line is dependent on
status of test. Color is green if test passes, yellow if test is
skipped, and red if the test fails or crashes. Summary line contains
counts of the statuses of the tests subtests or the test itself if it
has no subtests.
Example:
"Testing complete. Passed: 2, Failed: 0, Crashed: 0, Skipped: 0,
Errors: 0"
test - Test object representing current test being printed
"""
if test.status == TestStatus.SUCCESS:
color = green
elif test.status == TestStatus.SKIPPED or test.status == TestStatus.NO_TESTS:
color = yellow
else:
color = red
counts = test.counts
print_with_timestamp(color('Testing complete. ' + str(counts)))
def print_error(error_message: str) -> None:
"""
Prints error message with error format.
Example:
"[ERROR] Test example: missing test plan!"
Parameters:
error_message - message describing error
"""
print_with_timestamp(red('[ERROR] ') + error_message)
# Other methods:
def bubble_up_test_results(test: Test) -> None:
"""
If the test has subtests, add the test counts of the subtests to the
test and check if any of the tests crashed and if so set the test
status to crashed. Otherwise if the test has no subtests add the
status of the test to the test counts.
Parameters:
test - Test object for current test being parsed
"""
parse_crash_in_log(test)
subtests = test.subtests
counts = test.counts
status = test.status
for t in subtests:
counts.add_subtest_counts(t.counts)
if counts.total() == 0:
counts.add_status(status)
elif test.counts.get_status() == TestStatus.TEST_CRASHED:
test.status = TestStatus.TEST_CRASHED
def parse_test(lines: LineStream, expected_num: int, log: List[str]) -> Test:
"""
Finds next test to parse in LineStream, creates new Test object,
parses any subtests of the test, populates Test object with all
information (status, name) about the test and the Test objects for
any subtests, and then returns the Test object. The method accepts
three formats of tests:
Accepted test formats:
- Main KTAP/TAP header
Example:
KTAP version 1
1..4
[subtests]
- Subtest header line
Example:
# Subtest: name
1..3
[subtests]
ok 1 name
- Test result line
Example:
ok 1 - test
Parameters:
lines - LineStream of KTAP output to parse
expected_num - expected test number for test to be parsed
log - list of strings containing any preceding diagnostic lines
corresponding to the current test
Return:
Test object populated with characteristics and any subtests
"""
test = Test()
test.log.extend(log)
parent_test = False
main = parse_ktap_header(lines, test)
if main:
# If KTAP/TAP header is found, attempt to parse
# test plan
test.name = "main"
parse_test_plan(lines, test)
parent_test = True
else:
# If KTAP/TAP header is not found, test must be subtest
# header or test result line so parse attempt to parser
# subtest header
parent_test = parse_test_header(lines, test)
if parent_test:
# If subtest header is found, attempt to parse
# test plan and print header
parse_test_plan(lines, test)
print_test_header(test)
expected_count = test.expected_count
subtests = []
test_num = 1
while parent_test and (expected_count is None or test_num <= expected_count):
# Loop to parse any subtests.
# Break after parsing expected number of tests or
# if expected number of tests is unknown break when test
# result line with matching name to subtest header is found
# or no more lines in stream.
sub_log = parse_diagnostic(lines)
sub_test = Test()
if not lines or (peek_test_name_match(lines, test) and
not main):
if expected_count and test_num <= expected_count:
# If parser reaches end of test before
# parsing expected number of subtests, print
# crashed subtest and record error
test.add_error('missing expected subtest!')
sub_test.log.extend(sub_log)
test.counts.add_status(
TestStatus.TEST_CRASHED)
print_test_result(sub_test)
else:
test.log.extend(sub_log)
break
else:
sub_test = parse_test(lines, test_num, sub_log)
subtests.append(sub_test)
test_num += 1
test.subtests = subtests
if not main:
# If not main test, look for test result line
test.log.extend(parse_diagnostic(lines))
if (parent_test and peek_test_name_match(lines, test)) or \
not parent_test:
parse_test_result(lines, test, expected_num)
else:
test.add_error('missing subtest result line!')
# Check for there being no tests
if parent_test and len(subtests) == 0:
test.status = TestStatus.NO_TESTS
test.add_error('0 tests run!')
# Add statuses to TestCounts attribute in Test object
bubble_up_test_results(test)
if parent_test and not main:
# If test has subtests and is not the main test object, print
# footer.
print_test_footer(test)
elif not main:
print_test_result(test)
return test
def parse_run_tests(kernel_output: Iterable[str]) -> Test:
"""
Using kernel output, extract KTAP lines, parse the lines for test
results and print condensed test results and summary line .
Parameters:
kernel_output - Iterable object contains lines of kernel output
Return:
Test - the main test object with all subtests.
"""
print_with_timestamp(DIVIDER)
lines = extract_tap_lines(kernel_output)
test = Test()
if not lines:
test.add_error('invalid KTAP input!')
test.status = TestStatus.FAILURE_TO_PARSE_TESTS
else:
test = parse_test(lines, 0, [])
if test.status != TestStatus.NO_TESTS:
test.status = test.counts.get_status()
print_with_timestamp(DIVIDER)
print_summary_line(test)
return test