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comparison misc/systemd/socket-activation.lua @ 2352:3296a09b4e57

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misc/systemd: Experimental files for enabling socket activation
author Kim Alvefur <zash@zash.se>
date Tue, 08 Nov 2016 00:09:56 +0100
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2351:f8ecb4b248b0 2352:3296a09b4e57
1 -- Monkeypatch to support socket activation
2 --
3 -- Requires LuaSocket after "agnostic" changes merged
4 --
5 -- To enable:
6 -- RunScript "socket-activation.lua"
7
8 local socket = require"socket";
9 local tcp_serv_mt = debug.getregistry()["tcp{server}"];
10 local socket_bind = socket.bind;
11
12 local SD_LISTEN_FDS_START = 3;
13
14 local fds = tonumber(os.getenv"LISTEN_FDS") or 0;
15
16 if fds < SD_LISTEN_FDS_START then return; end
17
18 local servs = {};
19
20 for i = 1, fds do
21 local serv = socket.tcp();
22 if serv:getfd() >= 0 then
23 return; -- This won't work, we will leak the old FD
24 end
25 debug.setmetatable(serv, tcp_serv_mt);
26 serv:setfd(SD_LISTEN_FDS_START + i - 1);
27 local ip, port = serv:getsockname();
28 servs [ ip .. ":" .. port ] = serv;
29 end
30
31 function socket.bind( ip, port, backlog )
32 local sock = servs [ ip .. ":" .. port ];
33 if sock then
34 servs [ ip .. ":" .. port ] = nil;
35 return sock;
36 end
37 if next(servs) == nil then
38 -- my work here is done
39 socket.bind = socket_bind;
40 end
41 return socket_bind( ip, port, backlog );
42 end