Added detection check to find process by service command.

Modified RabbitMQ plugin to search for epmd process rather than rabbitmq-server
wrapper script which has been removed as of version 3.6.2

Change-Id: I54921ea52cd4d1dc458a4fda237858169f6afc0e

monasca_setup/detection/plugins/rabbitmq.py

@@ -48,7 +48,7 @@ class RabbitMQ(monasca_setup.detection.Plugin):
     def _detect(self):
         """Run detection, set self.available True if the service is detected.
         """
-        if monasca_setup.detection.find_process_cmdline('rabbitmq-server') is not None:
+        if monasca_setup.detection.find_process_service('rabbitmq-server') is not None:
             self.available = True
 
     def _get_config(self):
@@ -129,7 +129,7 @@ class RabbitMQ(monasca_setup.detection.Plugin):
         """
         config = monasca_setup.agent_config.Plugins()
         # First watch the process
-        config.merge(monasca_setup.detection.watch_process(['rabbitmq-server'], 'rabbitmq', detailed=False))
+        config.merge(monasca_setup.detection.watch_process(['epmd'], 'rabbitmq', detailed=False))
         log.info("\tWatching the rabbitmq-server process.")
         config.merge(monasca_setup.detection.watch_process_by_username('rabbitmq', 'rabbitmq', 'rabbitmq'))
         log.info("\tWatching all processes owned by the rabbitmq user.")

monasca_setup/detection/utils.py

@@ -60,6 +60,18 @@ def find_process_name(pname):
     return None
 
 
+def find_process_service(sname):
+    """Simple function to call systemctl (service) to check if a service is running.
+    """
+    try:
+        subprocess.check_call(['service', sname, 'status'], stdout=PIPE, stderr=PIPE)
+        return True
+    except subprocess.CalledProcessError:
+        return False
+
+    return False
+
+
 def find_addr_listening_on_port(port):
     """Return the IP address which is listening on the specified TCP port."""
     for conn in psutil.net_connections(kind='tcp'):