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# Copyright (C) 2010 Gabor Rapcsanyi (rgabor@inf.u-szeged.hu), University of Szeged
# Copyright (C) 2010 Andras Becsi (abecsi@inf.u-szeged.hu), University of Szeged
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. 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.
#
# THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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.
# FIXME: rename this file, and add more text about how this is
# different from the base file_lock class.
"""This class helps to block NRWT threads when more NRWTs run
perf, http and websocket tests in a same time."""
import logging
import os
import sys
import tempfile
import time
from webkitpy.common.system.executive import Executive
from webkitpy.common.system.file_lock import FileLock
from webkitpy.common.system.filesystem import FileSystem
_log = logging.getLogger(__name__)
class HttpLock(object):
def __init__(self, lock_path, lock_file_prefix="WebKitHttpd.lock.", guard_lock="WebKit.lock", filesystem=None, executive=None, name='HTTP'):
self._executive = executive or Executive()
self._filesystem = filesystem or FileSystem()
self._lock_path = lock_path
if not self._lock_path:
# FIXME: FileSystem should have an accessor for tempdir()
self._lock_path = tempfile.gettempdir()
self._lock_file_prefix = lock_file_prefix
self._lock_file_path_prefix = self._filesystem.join(self._lock_path, self._lock_file_prefix)
self._guard_lock_file = self._filesystem.join(self._lock_path, guard_lock)
self._guard_lock = FileLock(self._guard_lock_file)
self._process_lock_file_name = ""
self._name = name
def cleanup_http_lock(self):
"""Delete the lock file if exists."""
if self._filesystem.exists(self._process_lock_file_name):
_log.debug("Removing lock file: %s" % self._process_lock_file_name)
self._filesystem.remove(self._process_lock_file_name)
def _extract_lock_number(self, lock_file_name):
"""Return the lock number from lock file."""
prefix_length = len(self._lock_file_path_prefix)
return int(lock_file_name[prefix_length:])
def _lock_file_list(self):
"""Return the list of lock files sequentially."""
lock_list = self._filesystem.glob(self._lock_file_path_prefix + '*')
lock_list.sort(key=self._extract_lock_number)
return lock_list
def _next_lock_number(self):
"""Return the next available lock number."""
lock_list = self._lock_file_list()
if not lock_list:
return 0
return self._extract_lock_number(lock_list[-1]) + 1
def _current_lock_pid(self):
"""Return with the current lock pid. If the lock is not valid
it deletes the lock file."""
lock_list = self._lock_file_list()
if not lock_list:
_log.debug("No lock file list")
return
try:
current_pid = self._filesystem.read_text_file(lock_list[0])
if not (current_pid and self._executive.check_running_pid(int(current_pid))):
_log.debug("Removing stuck lock file: %s" % lock_list[0])
self._filesystem.remove(lock_list[0])
return
except IOError, e:
_log.debug("IOError: %s" % e)
return
except OSError, e:
_log.debug("OSError: %s" % e)
return
return int(current_pid)
def _create_lock_file(self):
"""The lock files are used to schedule the running test sessions in first
come first served order. The guard lock ensures that the lock numbers are
sequential."""
if not self._filesystem.exists(self._lock_path):
_log.debug("Lock directory does not exist: %s" % self._lock_path)
return False
if not self._guard_lock.acquire_lock():
_log.debug("Guard lock timed out!")
return False
self._process_lock_file_name = (self._lock_file_path_prefix + str(self._next_lock_number()))
_log.debug("Creating lock file: %s" % self._process_lock_file_name)
# FIXME: Executive.py should have an accessor for getpid()
self._filesystem.write_text_file(self._process_lock_file_name, str(os.getpid()))
self._guard_lock.release_lock()
return True
def wait_for_httpd_lock(self):
"""Create a lock file and wait until it's turn comes. If something goes wrong
it wont do any locking."""
if not self._create_lock_file():
_log.debug("Warning, %s locking failed!" % self._name)
return
# FIXME: This can hang forever!
while self._current_lock_pid() != os.getpid():
time.sleep(1)
_log.debug("%s lock acquired" % self._name)
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