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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http://mozilla.org/MPL/2.0/.
import sys
import tempfile
from cStringIO import StringIO
from collections import defaultdict
import wptrunner
import wpttest
from mozlog import commandline, reader
logger = None
def setup_logging(args, defaults):
global logger
logger = commandline.setup_logging("web-platform-tests-unstable", args, defaults)
wptrunner.setup_stdlib_logger()
for name in args.keys():
if name.startswith("log_"):
args.pop(name)
return logger
def group(items, size):
rv = []
i = 0
while i < len(items):
rv.append(items[i:i + size])
i += size
return rv
def next_power_of_two(num):
rv = 1
while rv < num:
rv = rv << 1
return rv
class Reducer(object):
def __init__(self, target, **kwargs):
self.target = target
self.test_type = kwargs["test_types"][0]
run_info = wpttest.get_run_info(kwargs["metadata_root"],
kwargs["product"],
debug=False)
test_filter = wptrunner.TestFilter(include=kwargs["include"])
self.test_loader = wptrunner.TestLoader(kwargs["tests_root"],
kwargs["metadata_root"],
[self.test_type],
run_info,
manifest_filer=test_filter)
if kwargs["repeat"] == 1:
logger.critical("Need to specify --repeat with more than one repetition")
sys.exit(1)
self.kwargs = kwargs
def run(self):
all_tests = self.get_initial_tests()
tests = all_tests[:-1]
target_test = [all_tests[-1]]
if self.unstable(target_test):
return target_test
if not self.unstable(all_tests):
return []
chunk_size = next_power_of_two(int(len(tests) / 2))
logger.debug("Using chunk size %i" % chunk_size)
while chunk_size >= 1:
logger.debug("%i tests remain" % len(tests))
chunks = group(tests, chunk_size)
chunk_results = [None] * len(chunks)
for i, chunk in enumerate(chunks):
logger.debug("Running chunk %i/%i of size %i" % (i + 1, len(chunks), chunk_size))
trial_tests = []
chunk_str = ""
for j, inc_chunk in enumerate(chunks):
if i != j and chunk_results[j] in (None, False):
chunk_str += "+"
trial_tests.extend(inc_chunk)
else:
chunk_str += "-"
logger.debug("Using chunks %s" % chunk_str)
trial_tests.extend(target_test)
chunk_results[i] = self.unstable(trial_tests)
# if i == len(chunks) - 2 and all(item is False for item in chunk_results[:-1]):
# Dangerous? optimisation that if you got stability for 0..N-1 chunks
# it must be unstable with the Nth chunk
# chunk_results[i+1] = True
# continue
new_tests = []
keep_str = ""
for result, chunk in zip(chunk_results, chunks):
if not result:
keep_str += "+"
new_tests.extend(chunk)
else:
keep_str += "-"
logger.debug("Keeping chunks %s" % keep_str)
tests = new_tests
chunk_size = int(chunk_size / 2)
return tests + target_test
def unstable(self, tests):
logger.debug("Running with %i tests" % len(tests))
self.test_loader.tests = {self.test_type: tests}
stdout, stderr = sys.stdout, sys.stderr
sys.stdout = StringIO()
sys.stderr = StringIO()
with tempfile.NamedTemporaryFile() as f:
args = self.kwargs.copy()
args["log_raw"] = [f]
args["capture_stdio"] = False
wptrunner.setup_logging(args, {})
wptrunner.run_tests(test_loader=self.test_loader, **args)
wptrunner.logger.remove_handler(wptrunner.logger.handlers[0])
is_unstable = self.log_is_unstable(f)
sys.stdout, sys.stderr = stdout, stderr
logger.debug("Result was unstable with chunk removed"
if is_unstable else "stable")
return is_unstable
def log_is_unstable(self, log_f):
log_f.seek(0)
statuses = defaultdict(set)
def handle_status(item):
if item["test"] == self.target:
statuses[item["subtest"]].add(item["status"])
def handle_end(item):
if item["test"] == self.target:
statuses[None].add(item["status"])
reader.each_log(reader.read(log_f),
{"test_status": handle_status,
"test_end": handle_end})
logger.debug(str(statuses))
if not statuses:
logger.error("Didn't get any useful output from wptrunner")
log_f.seek(0)
for item in reader.read(log_f):
logger.debug(item)
return None
return any(len(item) > 1 for item in statuses.itervalues())
def get_initial_tests(self):
# Need to pass in arguments
all_tests = self.test_loader.tests[self.test_type]
tests = []
for item in all_tests:
tests.append(item)
if item.url == self.target:
break
logger.debug("Starting with tests: %s" % ("\n".join(item.id for item in tests)))
return tests
def do_reduce(**kwargs):
target = kwargs.pop("target")
reducer = Reducer(target, **kwargs)
unstable_set = reducer.run()
return unstable_set
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