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#!/usr/bin/env python
# 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.
"""This class helps to block NRWT threads when more NRWTs run
http and websocket tests in a same time."""
import glob
import os
import sys
import tempfile
import time
class HttpLock(object):
def __init__(self, lock_path, lock_file_prefix="WebKitHttpd.lock.",
guard_lock="WebKit.lock"):
if not lock_path:
self._lock_path = tempfile.gettempdir()
self._lock_file_prefix = lock_file_prefix
self._lock_file_path_prefix = os.path.join(self._lock_path,
self._lock_file_prefix)
self._guard_lock_file = os.path.join(self._lock_path, guard_lock)
self._process_lock_file_name = ""
def cleanup_http_lock(self):
"""Delete the lock file if exists."""
if os.path.exists(self._process_lock_file_name):
os.unlink(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 = glob.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 _check_pid(self, current_pid):
"""Return True if pid is alive, otherwise return False.
FIXME: os.kill() doesn't work on Windows for checking if
a pid is alive, so always return True"""
if sys.platform in ('darwin', 'linux2'):
try:
os.kill(current_pid, 0)
except OSError:
return False
return True
def _curent_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:
return
try:
current_lock_file = open(lock_list[0], 'r')
current_pid = current_lock_file.readline()
current_lock_file.close()
if not (current_pid and self._check_pid(int(current_pid))):
os.unlink(lock_list[0])
return
except IOError, OSError:
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 sequential guard lock ensures that the lock
numbers are sequential."""
while(True):
try:
sequential_guard_lock = os.open(self._guard_lock_file, os.O_CREAT | os.O_EXCL)
self._process_lock_file_name = (self._lock_file_path_prefix +
str(self._next_lock_number()))
lock_file = open(self._process_lock_file_name, 'w')
lock_file.write(str(os.getpid()))
lock_file.close()
os.close(sequential_guard_lock)
os.unlink(self._guard_lock_file)
break
except OSError:
pass
def wait_for_httpd_lock(self):
"""Create a lock file and wait until it's turn comes."""
self._create_lock_file()
while self._curent_lock_pid() != os.getpid():
time.sleep(1)
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