diff options
Diffstat (limited to 'charms/trusty/cassandra/hooks/loglog.py')
-rw-r--r-- | charms/trusty/cassandra/hooks/loglog.py | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/charms/trusty/cassandra/hooks/loglog.py b/charms/trusty/cassandra/hooks/loglog.py new file mode 100644 index 0000000..33f3af8 --- /dev/null +++ b/charms/trusty/cassandra/hooks/loglog.py @@ -0,0 +1,42 @@ +# Copyright 2015 Canonical Ltd. +# +# This file is part of the Cassandra Charm for Juju. +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License version 3, as +# published by the Free Software Foundation. +# +# This program is distributed in the hope that it will be useful, but +# WITHOUT ANY WARRANTY; without even the implied warranties of +# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR +# PURPOSE. See the GNU General Public License for more details. +# +# 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 atexit +import subprocess +import threading +import time + +from charmhelpers.core import hookenv + + +def loglog(filename, prefix='', level=hookenv.DEBUG): + '''Mirror an arbitrary log file to the Juju hook log in the background.''' + tailproc = subprocess.Popen(['tail', '-F', filename], + stdout=subprocess.PIPE, + universal_newlines=True) + atexit.register(tailproc.terminate) + + def loglog_t(tailproc=tailproc): + while True: + line = tailproc.stdout.readline() + if line: + hookenv.log('{}{}'.format(prefix, line), level) + else: + time.sleep(0.1) + continue + + t = threading.Thread(target=loglog_t, daemon=True) + t.start() |