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authorTomás Touceda <chiiph@leap.se>2014-09-26 10:15:06 -0300
committerTomás Touceda <chiiph@leap.se>2014-09-26 10:15:06 -0300
commit6f7177f3ca359f8c3e74d094b0dcd0f9239fb069 (patch)
treef04b0eb5c4665a129c5c49719b2da65d325b111f /src/leap/bitmask/platform_init/locks.py
parente8c028f3eb6cd0681f039c456dc1ac45c98d598f (diff)
parent0db3d5a4aecc0a3c271b92c6187922c50d46df0a (diff)
Merge branch 'release-0.7.0'0.7.0rc20.7.0rc1
Diffstat (limited to 'src/leap/bitmask/platform_init/locks.py')
-rw-r--r--src/leap/bitmask/platform_init/locks.py59
1 files changed, 39 insertions, 20 deletions
diff --git a/src/leap/bitmask/platform_init/locks.py b/src/leap/bitmask/platform_init/locks.py
index 78ebf4cd..ac45a5ce 100644
--- a/src/leap/bitmask/platform_init/locks.py
+++ b/src/leap/bitmask/platform_init/locks.py
@@ -22,11 +22,11 @@ import errno
import os
import platform
-from leap.bitmask import platform_init
+from leap.bitmask.platform_init import IS_WIN, IS_UNIX
from leap.common.events import signal as signal_event
from leap.common.events import events_pb2 as proto
-if platform_init.IS_UNIX:
+if IS_UNIX:
from fcntl import flock, LOCK_EX, LOCK_NB
else: # WINDOWS
import datetime
@@ -40,7 +40,7 @@ else: # WINDOWS
logger = logging.getLogger(__name__)
-if platform_init.IS_UNIX:
+if IS_UNIX:
class UnixLock(object):
"""
@@ -48,14 +48,13 @@ if platform_init.IS_UNIX:
See man 2 flock
"""
- def __init__(self, path):
+ _LOCK_FILE = '/tmp/bitmask.lock'
+
+ def __init__(self):
"""
- iniializes t he UnixLock with the path of the
- desired lockfile
+ Initialize the UnixLock.
"""
-
self._fd = None
- self.path = path
def get_lock(self):
"""
@@ -77,7 +76,7 @@ if platform_init.IS_UNIX:
:rtype: bool
"""
- self._fd = os.open(self.path, os.O_CREAT | os.O_RDWR)
+ self._fd = os.open(self._LOCK_FILE, os.O_CREAT | os.O_RDWR)
try:
flock(self._fd, LOCK_EX | LOCK_NB)
@@ -102,6 +101,21 @@ if platform_init.IS_UNIX:
gotit, pid = self._get_lock_and_pid()
return pid == os.getpid()
+ @classmethod
+ def release_lock(self):
+ """
+ Release the lock.
+
+ :return: True if the lock was released, False otherwise
+ :rtype: bool
+ """
+ try:
+ os.remove(self._LOCK_FILE)
+ return True
+ except Exception as e:
+ logger.debug("Problem removing lock, {0!r}".format(e))
+ return False
+
def _get_lock_and_pid(self):
"""
Tries to get a lock over the file.
@@ -109,7 +123,6 @@ if platform_init.IS_UNIX:
:rtype: tuple
"""
-
if self._get_lock():
self._write_to_pidfile()
return True, None
@@ -121,9 +134,7 @@ if platform_init.IS_UNIX:
Tries to read pid from the pidfile,
returns False if no content found.
"""
-
- pidfile = os.read(
- self._fd, 16)
+ pidfile = os.read(self._fd, 16)
if not pidfile:
return False
@@ -144,7 +155,7 @@ if platform_init.IS_UNIX:
os.fsync(fd)
-if platform_init.IS_WIN:
+if IS_WIN:
# Time to wait (in secs) before assuming a raise window signal has not been
# ack-ed.
@@ -348,17 +359,15 @@ def we_are_the_one_and_only():
:rtype: bool
"""
- _sys = platform.system()
-
- if _sys in ("Linux", "Darwin"):
- locker = UnixLock('/tmp/bitmask.lock')
+ if IS_UNIX:
+ locker = UnixLock()
locker.get_lock()
we_are_the_one = locker.locked_by_us
if not we_are_the_one:
signal_event(proto.RAISE_WINDOW)
return we_are_the_one
- elif _sys == "Windows":
+ elif IS_WIN:
locker = WindowsLock()
locker.get_lock()
we_are_the_one = locker.locked_by_us
@@ -398,6 +407,16 @@ def we_are_the_one_and_only():
else:
logger.warning("Multi-instance checker "
- "not implemented for %s" % (_sys))
+ "not implemented for %s" % (platform.system()))
# lies, lies, lies...
return True
+
+
+def release_lock():
+ """
+ Release the acquired lock.
+ """
+ if IS_WIN:
+ WindowsLock.release_all_locks()
+ elif IS_UNIX:
+ UnixLock.release_lock()