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util.startup: Support systemd Type=notify service type

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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
This commit is contained in:
Kim Alvefur 2024-04-04 19:00:27 +02:00
parent 221f86f77f
commit 502b8d3998
2 changed files with 35 additions and 0 deletions
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1
CHANGES
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@ -66,6 +66,7 @@ TRUNK
- Intervals of mod_cron managed periodic jobs made configurable
- When mod_smacks is enabled, s2s connections not responding to ack requests are closed.
- Arguments to `prosodyctl shell` that start with ':' are now turned into method calls
- Support for Type=notify and notify-reload systemd service type added
## Removed

34
util/startup.lua
View file

@ -809,6 +809,39 @@ function startup.hook_posix_signals()
end);
end
function startup.systemd_notify()
local notify_socket_name = os.getenv("NOTIFY_SOCKET");
if not notify_socket_name then return end
local have_unix, unix = pcall(require, "socket.unix");
if not have_unix or type(unix) ~= "table" then
log("error", "LuaSocket without UNIX socket support, can't notify systemd.")
return os.exit(1);
end
log("debug", "Will notify on socket %q", notify_socket_name);
notify_socket_name = notify_socket_name:gsub("^@", "\0");
local notify_socket = unix.dgram();
local ok, err = notify_socket:setpeername(notify_socket_name);
if not ok then
log("error", "Could not connect to systemd notification socket %q: %q", notify_socket_name, err);
return os.exit(1);
end
local time = require "prosody.util.time";
prosody.notify_socket = notify_socket;
prosody.events.add_handler("server-started", function()
notify_socket:send("READY=1");
end);
prosody.events.add_handler("config-reloading", function()
notify_socket:send(string.format("RELOADING=1\nMONOTONIC_USEC=%d", math.floor(time.monotonic() * 1000000)));
end);
prosody.events.add_handler("config-reloaded", function()
notify_socket:send("READY=1");
end);
prosody.events.add_handler("server-stopping", function()
notify_socket:send("STOPPING=1");
end);
end
function startup.cleanup()
prosody.log("info", "Shutdown status: Cleaning up");
prosody.events.fire_event("server-cleanup");
@ -890,6 +923,7 @@ function startup.prosody()
startup.posix_daemonize();
startup.write_pidfile();
startup.hook_posix_signals();
startup.systemd_notify();
startup.prepare_to_start();
startup.notify_started();
end