view misc/systemd/socket-activation.lua @ 5356:959dc350f2ad

mod_http_oauth2: Declare https as required of URIs in schema If util.jsonschema happens to gain support for 'pattern' (regular expression validation) then this would be picked up. Until then, declarative annotations are nice.
author Kim Alvefur <zash@zash.se>
date Sat, 22 Apr 2023 14:06:41 +0200
parents 3296a09b4e57
children
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-- Monkeypatch to support socket activation
--
-- Requires LuaSocket after "agnostic" changes merged
--
-- To enable:
-- RunScript "socket-activation.lua"

local socket = require"socket";
local tcp_serv_mt = debug.getregistry()["tcp{server}"];
local socket_bind = socket.bind;

local SD_LISTEN_FDS_START = 3;

local fds = tonumber(os.getenv"LISTEN_FDS") or 0;

if fds < SD_LISTEN_FDS_START then return; end

local servs = {};

for i = 1, fds do
	local serv = socket.tcp();
	if serv:getfd() >= 0 then
		return; -- This won't work, we will leak the old FD
	end
	debug.setmetatable(serv, tcp_serv_mt);
	serv:setfd(SD_LISTEN_FDS_START + i - 1);
	local ip, port = serv:getsockname();
	servs [ ip .. ":" .. port ] = serv;
end

function socket.bind( ip, port, backlog )
	local sock = servs [ ip .. ":" .. port ];
	if sock then
		servs [ ip .. ":" .. port ] = nil;
		return sock;
	end
	if next(servs) == nil then
		-- my work here is done
		socket.bind = socket_bind;
	end
	return socket_bind( ip, port, backlog );
end