I am writing a web server in Go using the standard library
net/http package that makes use of systemd socket activation.
I have the basics working such that the server is started the first time a connection is made to the listening socket, and I can perform a graceful shutdown when signalled (i.e. so
systemctl stop will work without cutting off active requests).
What I would like is for the server to automatically exit when it has been idle for some period of time. Something like the following:
- when the last active request completes, start a timer for say 30 seconds.
- if any new request arrives during that period, stop the timer.
- if the timer expires, perform a graceful shutdown.
The idea being to release the resources the server was using, in the knowledge that systemd will start us again when a new client turns up.
It's parts (1) and (2) that I'm not sure about. Ideally I'd like a solution that doesn't involve modifying all the registered handlers too.