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# 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()
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