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()