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# Copyright (c) 2009 Google Inc. All rights reserved.
# Copyright (c) 2009 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import logging
import sys
import traceback
from datetime import datetime, timedelta
from webkitpy.common.system.executive import ScriptError
from webkitpy.common.system.outputtee import OutputTee
_log = logging.getLogger(__name__)
# FIXME: This will be caught by "except Exception:" blocks, we should consider
# making this inherit from SystemExit instead (or BaseException, except that's not recommended).
class TerminateQueue(Exception):
pass
class QueueEngineDelegate:
def queue_log_path(self):
raise NotImplementedError, "subclasses must implement"
def work_item_log_path(self, work_item):
raise NotImplementedError, "subclasses must implement"
def begin_work_queue(self):
raise NotImplementedError, "subclasses must implement"
def should_continue_work_queue(self):
raise NotImplementedError, "subclasses must implement"
def next_work_item(self):
raise NotImplementedError, "subclasses must implement"
def process_work_item(self, work_item):
raise NotImplementedError, "subclasses must implement"
def handle_unexpected_error(self, work_item, message):
raise NotImplementedError, "subclasses must implement"
class QueueEngine:
def __init__(self, name, delegate, wakeup_event, seconds_to_sleep=120):
self._name = name
self._delegate = delegate
self._wakeup_event = wakeup_event
self._output_tee = OutputTee()
self._seconds_to_sleep = seconds_to_sleep
log_date_format = "%Y-%m-%d %H:%M:%S"
handled_error_code = 2
# Child processes exit with a special code to the parent queue process can detect the error was handled.
@classmethod
def exit_after_handled_error(cls, error):
_log.error(error)
sys.exit(cls.handled_error_code)
def run(self):
self._begin_logging()
self._delegate.begin_work_queue()
while (self._delegate.should_continue_work_queue()):
try:
self._ensure_work_log_closed()
work_item = self._delegate.next_work_item()
if not work_item:
self._sleep("No work item.")
continue
# FIXME: Work logs should not depend on bug_id specificaly.
# This looks fixed, no?
self._open_work_log(work_item)
try:
if not self._delegate.process_work_item(work_item):
_log.warning("Unable to process work item.")
continue
except ScriptError, e:
# Use a special exit code to indicate that the error was already
# handled in the child process and we should just keep looping.
if e.exit_code == self.handled_error_code:
continue
message = "Unexpected failure when processing patch! Please file a bug against webkit-patch.\n%s" % e.message_with_output()
self._delegate.handle_unexpected_error(work_item, message)
except TerminateQueue, e:
self._stopping("TerminateQueue exception received.")
return 0
except KeyboardInterrupt, e:
self._stopping("User terminated queue.")
return 1
except Exception, e:
traceback.print_exc()
# Don't try tell the status bot, in case telling it causes an exception.
self._sleep("Exception while preparing queue")
self._stopping("Delegate terminated queue.")
return 0
def _stopping(self, message):
_log.info("\n%s" % message)
self._delegate.stop_work_queue(message)
# Be careful to shut down our OutputTee or the unit tests will be unhappy.
self._ensure_work_log_closed()
self._output_tee.remove_log(self._queue_log)
def _begin_logging(self):
self._queue_log = self._output_tee.add_log(self._delegate.queue_log_path())
self._work_log = None
def _open_work_log(self, work_item):
work_item_log_path = self._delegate.work_item_log_path(work_item)
if not work_item_log_path:
return
self._work_log = self._output_tee.add_log(work_item_log_path)
def _ensure_work_log_closed(self):
# If we still have a bug log open, close it.
if self._work_log:
self._output_tee.remove_log(self._work_log)
self._work_log = None
def _now(self):
"""Overriden by the unit tests to allow testing _sleep_message"""
return datetime.now()
def _sleep_message(self, message):
wake_time = self._now() + timedelta(seconds=self._seconds_to_sleep)
if self._seconds_to_sleep < 3 * 60:
sleep_duration_text = str(self._seconds_to_sleep) + ' seconds'
else:
sleep_duration_text = str(round(self._seconds_to_sleep / 60)) + ' minutes'
return "%s Sleeping until %s (%s)." % (message, wake_time.strftime(self.log_date_format), sleep_duration_text)
def _sleep(self, message):
_log.info(self._sleep_message(message))
self._wakeup_event.wait(self._seconds_to_sleep)
self._wakeup_event.clear()
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