From fb75dc323ed398d99aa1b2aa077cc8c5d5599c48 Mon Sep 17 00:00:00 2001
From: Fabio Manganiello <blacklight86@gmail.com>
Date: Wed, 19 Dec 2018 21:15:06 +0100
Subject: [PATCH] Added pidfile option to the main

---
 platypush/__init__.py | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/platypush/__init__.py b/platypush/__init__.py
index 9b10ba5fb..a3993b848 100644
--- a/platypush/__init__.py
+++ b/platypush/__init__.py
@@ -7,6 +7,7 @@ Platypush
 
 import argparse
 import logging
+import os
 import sys
 import traceback
 
@@ -41,21 +42,31 @@ class Daemon:
     # - plugins will post the responses they process
     bus = None
 
+    pidfile = None
+
     # backend_name => backend_obj map
     backends = None
 
     # number of executions retries before a request fails
     n_tries = 2
 
-    def __init__(self, config_file=None, requests_to_process=None):
+    def __init__(self, config_file=None, pidfile=None, requests_to_process=None):
         """
         Constructor
         Params:
             config_file -- Configuration file override (default: None)
+            pidfile -- File where platypush will store its PID upon launch,
+                       useful if you're planning to integrate the application
+                       within a service or a launcher script (default: None)
             requests_to_process -- Exit after processing the specified number
                                    of requests (default: None, loop forever)
         """
 
+        if pidfile:
+            self.pidfile = pidfile
+            with open(self.pidfile, 'w') as f:
+                f.write(os.getpid())
+
         self.config_file = config_file
         self.event_processor = EventProcessor()
         self.requests_to_process = requests_to_process
@@ -74,9 +85,13 @@ class Daemon:
         parser = argparse.ArgumentParser()
         parser.add_argument('--config', '-c', dest='config', required=False,
                             default=None, help=cls.config_file.__doc__)
+        parser.add_argument('--pidfile', '-P', dest='pidfile', required=False,
+                            default=None, help="File where platypush will " +
+                            "store its PID, useful if you're planning to " +
+                            "integrate it in a service")
 
         opts, args = parser.parse_known_args(args)
-        return cls(config_file=opts.config)
+        return cls(config_file=opts.config, pidfile=opts.pidfile)
 
     def on_message(self):
         """