/usr/lib/python3/dist-packages/lvmdbusd/request.py is in lvm2-dbusd 2.02.176-4.1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 | # Copyright (C) 2015-2016 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import threading
# noinspection PyUnresolvedReferences
from gi.repository import GLib
from .job import Job
from . import cfg
import traceback
from .utils import log_error, mt_async_call
class RequestEntry(object):
def __init__(self, tmo, method, arguments, cb, cb_error,
return_tuple=True, job_state=None):
self.method = method
self.arguments = arguments
self.cb = cb
self.cb_error = cb_error
self.timer_id = -1
self.lock = threading.RLock()
self.done = False
self._result = None
self._job = None
self._rc = 0
self._rc_error = None
self._return_tuple = return_tuple
self._job_state = job_state
if tmo < 0:
# Client is willing to block forever
pass
elif tmo == 0:
self._return_job()
else:
# Note: using 990 instead of 1000 for second to ms conversion to
# account for overhead. Goal is to return just before the
# timeout amount has expired. Better to be a little early than
# late.
self.timer_id = GLib.timeout_add(
tmo * 990, RequestEntry._request_timeout, self)
@staticmethod
def _request_timeout(r):
"""
Method which gets called when the timer runs out!
:param r: RequestEntry which timed out
:return: Result of timer_expired
"""
return r.timer_expired()
def _return_job(self):
# Return job is only called when we create a request object or when
# we pop a timer. In both cases we are running in the correct context
# and do not need to schedule the call back in main context.
self._job = Job(self, self._job_state)
cfg.om.register_object(self._job, True)
if self._return_tuple:
self.cb(('/', self._job.dbus_object_path()))
else:
self.cb(self._job.dbus_object_path())
def run_cmd(self):
try:
result = self.method(*self.arguments)
self.register_result(result)
except Exception as e:
# Use the request entry to return the result as the client may
# have gotten a job by the time we hit an error
# Lets get the stacktrace and set that to the error message
st = traceback.format_exc()
cfg.blackbox.dump()
log_error("Exception returned to client: \n%s" % st)
self.register_error(-1, str(e), e)
def is_done(self):
with self.lock:
rc = self.done
return rc
def get_errors(self):
with self.lock:
return (self._rc, self._rc_error)
def result(self):
with self.lock:
if self.done:
return self._result
return '/'
def _reg_ending(self, result, error_rc=0, error_msg=None,
error_exception=None):
with self.lock:
self.done = True
if self.timer_id != -1:
# Try to prevent the timer from firing
GLib.source_remove(self.timer_id)
self._result = result
self._rc = error_rc
self._rc_error = error_msg
if not self._job:
# We finished and there is no job, so return result or error
# now!
# Note: If we don't have a valid cb or cbe, this indicates a
# request that doesn't need a response as we already returned
# one before the request was processed.
if error_rc == 0:
if self.cb:
if self._return_tuple:
mt_async_call(self.cb, (result, '/'))
else:
mt_async_call(self.cb, result)
else:
if self.cb_error:
if not error_exception:
if not error_msg:
error_exception = Exception(
"An error occurred, but no reason was "
"given, see service logs!")
else:
error_exception = Exception(error_msg)
mt_async_call(self.cb_error, error_exception)
else:
# We have a job and it's complete, indicate that it's done.
self._job.Complete = True
self._job = None
def register_error(self, error_rc, error_message, error_exception):
self._reg_ending('/', error_rc, error_message, error_exception)
def register_result(self, result):
self._reg_ending(result)
def timer_expired(self):
with self.lock:
# Set the timer back to -1 as we will get a warning if we try
# to remove a timer that doesn't exist
self.timer_id = -1
if not self.done:
# Create dbus job object and return path to caller
self._return_job()
else:
# The job is done, we have nothing to do
pass
return False
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