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# Copyright (C) 2014 Red Hat, Inc. 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT OWNER 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.
#
# The views and conclusions contained in the software and documentation are
# those of the authors and should not be interpreted as representing official
# policies, either expressed or implied, of the FreeBSD Project.
#
# Authors: Tomas Bzatek <tbzatek@redhat.com>
#
from lmi.scripts.common.errors import LmiFailed
from lmi.shell import LMIIndicationListener
import socket
import time
import random
NUM_TAIL = 50
def list_messages(ns, reverse=False, tail=False):
"""
List messages from the journal.
:param boolean reverse: List messages from newest to oldest.
:param boolean tail: List only the last 50 messages
"""
inst = ns.LMI_JournalMessageLog.first_instance()
if not inst:
raise LmiFailed("Cannot initialize Journald provider. (hint: check if it's installed)")
if reverse or tail:
r = inst.PositionToLastRecord()
else:
r = inst.PositionToFirstRecord()
if not 'IterationIdentifier' in r.rparams:
raise LmiFailed("Cannot initialize Journald iteration. (hint: check SELinux AVCs)")
iter_id = r.rparams['IterationIdentifier']
if tail:
r = inst.PositionAtRecord(IterationIdentifier=iter_id, MoveAbsolute=False, RecordNumber=-NUM_TAIL)
iter_id = r.rparams['IterationIdentifier']
try:
while True:
r = inst.GetRecord(IterationIdentifier=iter_id, PositionToNext=(not reverse))
if r.rval != 0:
break
iter_id = r.rparams['IterationIdentifier']
if reverse:
x = inst.PositionAtRecord(IterationIdentifier=iter_id, MoveAbsolute=False, RecordNumber=-1)
iter_id = x.rparams['IterationIdentifier']
print "".join(map(chr, r.rparams['RecordData']))
except KeyboardInterrupt:
pass
inst.CancelIteration(IterationIdentifier=iter_id)
return 0;
def log_message(ns, message):
"""
Logs a new message in the journal.
:param message: A message to log.
:type message: string
"""
ns.LMI_JournalLogRecord.create_instance({"CreationClassName": "LMI_JournalLogRecord",
"LogCreationClassName": "LMI_JournalMessageLog",
"LogName": "Journal",
"DataFormat": message})
return 0;
def ind_handler(indication, **kwargs):
exported_objects = indication.exported_objects()
for i in exported_objects:
print i["SourceInstance"]["DataFormat"]
def watch(ns):
"""
Sets up a new indication listener and waits for events.
"""
indication_port = random.randint(12000, 13000)
listener = LMIIndicationListener("0.0.0.0", indication_port)
uniquename = listener.add_handler("lmiscript_journald_watch-XXXXXXXX", ind_handler)
ret = listener.start()
if not ret:
raise LmiFailed("Cannot initialize indication listener on port %d" % indication_port)
ret = ns.connection.subscribe_indication(
Name=uniquename,
Query="SELECT * FROM LMI_JournalLogRecordInstanceCreationIndication WHERE SOURCEINSTANCE ISA LMI_JournalLogRecord",
Destination="http://%s:%d" % (socket.gethostname(), indication_port)
)
if not ret or not ret.rval:
raise LmiFailed("Failed to register indication: %s\n" % retval.errorstr)
try:
print "Watching journal, press Ctrl+C to abort"
print ""
while True:
time.sleep(1)
pass
except KeyboardInterrupt:
pass
ns.connection.unsubscribe_indication(uniquename)
return 0;
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