eventsapi: Add Init scripts for different distributions

Added init scripts for
- SysvInit(CentOS 6 or Red Hat 6)
- rc.d (FreeBSD)

Most of the latest distributions are using systemd. Support to be
added for other distributions which are not using systemd.

Removed systemctl wrapper functions(start/stop/status) from
gluster-eventsapi CLI(peer_eventsapi.py). Status and Reload
re-implemented using pid file check.

Added pid file support for glustereventsd.

Following dependencies removed
python-flask - Only used for example dashboard. User can install
if required.
python-fasteners - Not available for EPEL 6, added custom code using
fcntl as replacement.

BUG: 1365395
Change-Id: I26792eae9b11e93304f70b3997cd7d8d03b067f4
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: http://review.gluster.org/15367
Smoke: Gluster Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

1 files changed, 18 insertions, 3 deletions

diff --git a/events/src/glustereventsd.py b/events/src/glustereventsd.py
index 91a0743ff22..d057e097c97 100644
--- a/events/src/glustereventsd.py
+++ b/events/src/glustereventsd.py
@@ -15,12 +15,13 @@ import sys
 import signal
 import SocketServer
 import socket
+from argparse import ArgumentParser, RawDescriptionHelpFormatter
 
 from eventtypes import all_events
 import handlers
 import utils
-from eventsapiconf import SERVER_ADDRESS
-from utils import logger
+from eventsapiconf import SERVER_ADDRESS, PID_FILE
+from utils import logger, PidFile, PidFileLockFailed
 
 
 class GlusterEventsRequestHandler(SocketServer.BaseRequestHandler):
@@ -90,9 +91,23 @@ def init_event_server():
     server.serve_forever()
 
 
+def get_args():
+    parser = ArgumentParser(formatter_class=RawDescriptionHelpFormatter,
+                            description=__doc__)
+    parser.add_argument("-p", "--pid-file", help="PID File",
+                        default=PID_FILE)
+
+    return parser.parse_args()
+
+
 def main():
+    args = get_args()
     try:
-        init_event_server()
+        with PidFile(args.pid_file):
+            init_event_server()
+    except PidFileLockFailed as e:
+        sys.stderr.write("Failed to get lock for pid file({0}): {1}".format(
+            args.pid_file, e))
     except KeyboardInterrupt:
         sys.exit(1)