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Run background process on successful quick start in cherry

I have a REST WebService built on top of a cherry tree. The service is called online with a call cherrypy.quickstart()

.

I want to start a background process with help subprocess.Popen()

right after the service starts on the network. The call is cherrypy.quickstart()

blocked. How do I add a callback to start a background process?

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If the background task is simple and not CPU bound, I suggest you use cherrypy.process.plugins.BackgroundTask

. This is a thread based solution. Here's an answer with a complete example.

Generally, in CherryPy, we don't pass callbacks for internal components. We use Plugins instead . CherryPy native components like session expiration or request timeout, demonizer and PID-writer and others are plugins. The plugin lifecycle is tied to the message bus . FSM diagram illustrates state changes. In your plugin, you just need to handle some states that make sense for your task.



                 O
                 |
                 V
STOPPING --> STOPPED --> EXITING -> X
   A   A         |
   |    \___     |
   |        \    |
   |         V   V
 STARTED <-- STARTING

There is a Plugin example in this answer . Also take a look at Sylvain Hellegouarch's CherryPys Bus Process Control.

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If you need to use cherrypy, you can use a bus to receive process start / stop notifications. Your best bet would be to use a dispatcher (supervisor or circus) to manage the processes.



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