view mod_s2s_keepalive/mod_s2s_keepalive.lua @ 4976:75b6e5df65f9

various: Improve error reporting if missing file server module on 0.12 If there is some error loading net.http.files then it would be swallowed by the pcall and then it would proceed to trying mod_http_files, which might cause unexpected behavior on 0.12 Ref #1765
author Kim Alvefur <zash@zash.se>
date Mon, 18 Jul 2022 22:47:54 +0200
parents 0e60ce83205c
children
line wrap: on
line source

local st = require "util.stanza";
local watchdog = require "util.watchdog";
local dt = require "util.datetime";

local keepalive_servers = module:get_option_set("keepalive_servers");
local keepalive_interval = module:get_option_number("keepalive_interval", 60);
local keepalive_timeout = module:get_option_number("keepalive_timeout", 593);

local host = module.host;
local s2sout = prosody.hosts[host].s2sout;

local function send_pings()
	local ping_hosts = {};

	for remote_domain, session in pairs(s2sout) do
		if session.type ~= "s2sout_unauthed"
		and (not(keepalive_servers) or keepalive_servers:contains(remote_domain)) then
			session.sends2s(st.iq({ to = remote_domain, type = "get", from = host, id = "keepalive:"..dt.datetime()})
				:tag("ping", { xmlns = "urn:xmpp:ping" })
			);
		end
	end

	for session in pairs(prosody.incoming_s2s) do
		if session.type ~= "s2sin_unauthed"
		and not session.notopen
		and session.to_host == host
		and (not(keepalive_servers) or keepalive_servers:contains(session.from_host)) then
			if not s2sout[session.from_host] then ping_hosts[session.from_host] = true; end
			session.sends2s " ";
			-- If the connection is dead, this should make it time out.
		end
	end

	-- ping remotes we only have s2sin from
	for remote_domain in pairs(ping_hosts) do
		module:send(st.iq({ to = remote_domain, type = "get", from = host, id = "keepalive:"..dt.datetime() })
			:tag("ping", { xmlns = "urn:xmpp:ping" })
		);
	end

	return keepalive_interval;
end

module:hook("s2sin-established", function (event)
	local session = event.session;
	if session.watchdog_keepalive then return end -- in case mod_bidi fires this twice
	if keepalive_servers and not keepalive_servers:contains(session.from_host) then return end
	session.watchdog_keepalive = watchdog.new(keepalive_timeout, function ()
		session.log("info", "Keepalive ping timed out, closing connection");
		session:close("connection-timeout");
	end);
end);

module:hook("s2sout-established", function (event)
	local session = event.session;
	if session.watchdog_keepalive then return end -- in case mod_bidi fires this twice
	if keepalive_servers and not keepalive_servers:contains(session.from_host) then return end
	session.watchdog_keepalive = watchdog.new(keepalive_timeout, function ()
		session.log("info", "Keepalive ping timed out, closing connection");
		session:close("connection-timeout");
	end);
end);

module:hook("iq/host", function (event)
	local stanza = event.stanza;
	if stanza.attr.type ~= "result" and stanza.attr.type ~= "error" then
		return -- not a reply iq stanza
	end
	if not (stanza.attr.id and stanza.attr.id:sub(1, #"keepalive:") == "keepalive:") then
		return -- not a reply to this module
	end
	if stanza.attr.type == "error" then
		local err = stanza:get_child("error");
		local err_by = err and err.attr.by;
		if err_by and prosody.hosts[err_by] then
			return -- error produced by the local host
		end
	end

	local origin = event.origin;
	if origin.dummy then return end -- Probably a sendq bounce
	if origin.watchdog_keepalive then
		origin.log("debug", "Resetting keepalive watchdog")
		origin.watchdog_keepalive:reset();
	end
	if s2sout[origin.from_host] and s2sout[origin.from_host].watchdog_keepalive then
		s2sout[origin.from_host].watchdog_keepalive:reset();
	end
	return true;
end);

module:add_timer(keepalive_interval, send_pings);