/usr/share/pyshared/lsm/pluginrunner.py is in python-libstoragemgmt 0.0.20-1.
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 | # Copyright (C) 2011-2013 Red Hat, Inc.
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
# Author: tasleson
import socket
import traceback
import sys
from common import SocketEOF, LsmError, Error, ErrorNumber
import cmdline
import transport
class PluginRunner(object):
"""
Plug-in side common code which uses the passed in plugin to do meaningful
work.
"""
def _is_number(self, val):
"""
Returns True if val is an integer.
"""
try:
int(val)
return True
except ValueError:
return False
def __init__(self, plugin, args):
self.cmdline = False
if len(args) == 2 and self._is_number(args[1]):
try:
fd = int(args[1])
self.tp = transport.Transport(
socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM))
#At this point we can return errors to the client, so we can
#inform the client if the plug-in fails to create itself
try:
self.plugin = plugin()
except Exception as e:
self.tp.send_error(0, -32099,
'Error instantiating plug-in ' + str(e))
raise e
except Exception:
Error(traceback.format_exc())
Error('Plug-in exiting.')
sys.exit(2)
else:
self.cmdline = True
cmdline.cmd_line_wrapper(plugin)
def run(self):
#Don't need to invoke this when running stand alone as a cmdline
if self.cmdline:
return
need_shutdown = False
msg_id = 0
try:
while True:
try:
#result = None
msg = self.tp.read_req()
method = msg['method']
msg_id = msg['id']
params = msg['params']
#Check to see if this plug-in implements this operation
#if not return the expected error.
if hasattr(self.plugin, method):
if params is None:
result = getattr(self.plugin, method)()
else:
result = getattr(self.plugin, method)(
**msg['params'])
else:
raise LsmError(ErrorNumber.NO_SUPPORT,
"Unsupported operation")
self.tp.send_resp(result)
if method == 'startup':
need_shutdown = True
if method == 'shutdown':
#This is a graceful shutdown
need_shutdown = False
self.tp.close()
break
except ValueError as ve:
Error(traceback.format_exc())
self.tp.send_error(msg_id, -32700, str(ve))
except AttributeError as ae:
Error(traceback.format_exc())
self.tp.send_error(msg_id, -32601, str(ae))
except LsmError as lsm_err:
self.tp.send_error(msg_id, lsm_err.code, lsm_err.msg,
lsm_err.data)
except SocketEOF:
#Client went away
Error('Client went away, exiting plug-in')
except Exception:
Error("Unhandled exception in plug-in!\n" + traceback.format_exc())
try:
self.tp.send_error(msg_id, ErrorNumber.PLUGIN_ERROR,
"Unhandled exception in plug-in",
str(traceback.format_exc()))
except Exception:
pass
finally:
if need_shutdown:
#Client wasn't nice, we will allow plug-in to cleanup
self.plugin.shutdown()
sys.exit(2)
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