view mod_graceful_shutdown/README.markdown @ 3097:c7f4e3987ed0

mod_slack_webhooks: Fix error handling for JSON parsing util.json follows the return nil,errmsg pattern, it does not throw hard error as this code seemed to expect
author Kim Alvefur <zash@zash.se>
date Sun, 03 Jun 2018 01:34:23 +0200
parents 88474dd1af48
children 999e7cb7f6d9
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This module is an experiment about a more graceful shutdown process.

Why
===

When shutting down, a number of sessions, connections and other things
are teared down. Due to all these things happening very quickly,
sometimes e.g. client unavailable notifications don't make it to all
remote contacts because the server-to-server connections are teared down
just after.

How
===

This module works by breaking the shutdown process into separate steps
with a brief pause between them.

It goes something like this

1.  Stop accepting new client connections.
2.  Close all client connections.
3.  Fire event for everything else.
4.  Tell `net.server` to quit the main loop.
5.  ???
6.  Still here? Kill itself.