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"""
Enables supports for running tests simultaneously by processing them
from a multi-consumer queue.
"""
from __future__ import absolute_import
import sys
from .. import config
from .. import errors
from ..utils import queue as _queue
class Job(object):
"""
Runs tests from a queue.
"""
def __init__(self, logger, fixture, hooks, report, archival, suite_options):
"""
Initializes the job with the specified fixture and hooks.
"""
self.logger = logger
self.fixture = fixture
self.hooks = hooks
self.report = report
self.archival = archival
self.suite_options = suite_options
def __call__(self, queue, interrupt_flag, teardown_flag=None):
"""
Continuously executes tests from 'queue' and records their
details in 'report'.
If 'teardown_flag' is not None, then 'self.fixture.teardown()'
will be called before this method returns. If an error occurs
while destroying the fixture, then the 'teardown_flag' will be
set.
"""
should_stop = False
try:
self._run(queue, interrupt_flag)
except errors.StopExecution as err:
# Stop running tests immediately.
self.logger.error("Received a StopExecution exception: %s.", err)
should_stop = True
except:
# Unknown error, stop execution.
self.logger.exception("Encountered an error during test execution.")
should_stop = True
if should_stop:
# Set the interrupt flag so that other jobs do not start running more tests.
interrupt_flag.set()
# Drain the queue to unblock the main thread.
Job._drain_queue(queue)
if teardown_flag is not None:
try:
self.fixture.teardown(finished=True)
except errors.ServerFailure as err:
self.logger.warn("Teardown of %s was not successful: %s", self.fixture, err)
teardown_flag.set()
except:
self.logger.exception("Encountered an error while tearing down %s.", self.fixture)
teardown_flag.set()
def _run(self, queue, interrupt_flag):
"""
Calls the before/after suite hooks and continuously executes
tests from 'queue'.
"""
for hook in self.hooks:
hook.before_suite(self.report)
while not interrupt_flag.is_set():
test = queue.get_nowait()
try:
if test is None:
# Sentinel value received, so exit.
break
self._execute_test(test)
finally:
queue.task_done()
for hook in self.hooks:
hook.after_suite(self.report)
def _execute_test(self, test):
"""
Calls the before/after test hooks and executes 'test'.
"""
test.configure(self.fixture, config.NUM_CLIENTS_PER_FIXTURE)
self._run_hooks_before_tests(test)
test(self.report)
try:
if self.suite_options.fail_fast and not self.report.wasSuccessful():
self.logger.info("%s failed, so stopping..." % (test.shortDescription()))
raise errors.StopExecution("%s failed" % (test.shortDescription()))
if not self.fixture.is_running():
self.logger.error(
"%s marked as a failure because the fixture crashed during the test.",
test.shortDescription())
self.report.setFailure(test, return_code=2)
# Always fail fast if the fixture fails.
raise errors.StopExecution("%s not running after %s" % (self.fixture,
test.shortDescription()))
finally:
success = self.report._find_test_info(test).status == "pass"
if self.archival:
self.archival.archive(self.logger, test, success)
self._run_hooks_after_tests(test)
def _run_hook(self, hook, hook_function, test):
""" Helper to run hook and archival. """
try:
success = False
hook_function(test, self.report)
success = True
finally:
if self.archival:
self.archival.archive(self.logger, test, success, hook=hook)
def _run_hooks_before_tests(self, test):
"""
Runs the before_test method on each of the hooks.
Swallows any TestFailure exceptions if set to continue on
failure, and reraises any other exceptions.
"""
try:
for hook in self.hooks:
self._run_hook(hook, hook.before_test, test)
except errors.StopExecution:
raise
except errors.ServerFailure:
self.logger.exception("%s marked as a failure by a hook's before_test.",
test.shortDescription())
self._fail_test(test, sys.exc_info(), return_code=2)
raise errors.StopExecution("A hook's before_test failed")
except errors.TestFailure:
self.logger.exception("%s marked as a failure by a hook's before_test.",
test.shortDescription())
self._fail_test(test, sys.exc_info(), return_code=1)
if self.suite_options.fail_fast:
raise errors.StopExecution("A hook's before_test failed")
except:
# Record the before_test() error in 'self.report'.
self.report.startTest(test)
self.report.addError(test, sys.exc_info())
self.report.stopTest(test)
raise
def _run_hooks_after_tests(self, test):
"""
Runs the after_test method on each of the hooks.
Swallows any TestFailure exceptions if set to continue on
failure, and reraises any other exceptions.
"""
try:
for hook in self.hooks:
self._run_hook(hook, hook.after_test, test)
except errors.StopExecution:
raise
except errors.ServerFailure:
self.logger.exception("%s marked as a failure by a hook's after_test.",
test.shortDescription())
self.report.setFailure(test, return_code=2)
raise errors.StopExecution("A hook's after_test failed")
except errors.TestFailure:
self.logger.exception("%s marked as a failure by a hook's after_test.",
test.shortDescription())
self.report.setFailure(test, return_code=1)
if self.suite_options.fail_fast:
raise errors.StopExecution("A hook's after_test failed")
except:
self.report.setError(test)
raise
def _fail_test(self, test, exc_info, return_code=1):
"""
Helper to record a test as a failure with the provided return
code.
This method should not be used if 'test' has already been
started, instead use TestReport.setFailure().
"""
self.report.startTest(test)
test.return_code = return_code
self.report.addFailure(test, exc_info)
self.report.stopTest(test)
@staticmethod
def _drain_queue(queue):
"""
Removes all elements from 'queue' without actually doing
anything to them. Necessary to unblock the main thread that is
waiting for 'queue' to be empty.
"""
try:
while not queue.empty():
queue.get_nowait()
queue.task_done()
except _queue.Empty:
# Multiple threads may be draining the queue simultaneously, so just ignore the
# exception from the race between queue.empty() being false and failing to get an item.
pass
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