util.startup: Support systemd Type=notify service type
This lets Prosody report its lifecycle status to systemd, so it knows
when Prosody has completed its startup, when it's reloading and shutting
down.
Both Type=notify and Type=notify-reload is supported
Example systemd .service configuration snippet:
[Service]
Type=notify
module:set_global();
local filters = require "prosody.util.filters";
local function log_send(t, session)
if t and t ~= "" and t ~= " " then
session.log("debug", "SEND: %s", t);
end
return t;
end
local function log_recv(t, session)
if t and t ~= "" and t ~= " " then
session.log("debug", "RECV: %s", t);
end
return t;
end
local function init_raw_logging(session)
filters.add_filter(session, "stanzas/in", log_recv, -10000);
filters.add_filter(session, "stanzas/out", log_send, 10000);
end
filters.add_filter_hook(init_raw_logging);
function module.unload()
filters.remove_filter_hook(init_raw_logging);
end