net.server_epoll: Add support for systemd socket activation
Allows creating listening sockets and accepting client connections
before Prosody starts.
This is unlike normal Prosody dynamic resource management, where ports
may added and removed at any time, and the ports defined by the config.
Weird things happen if these are closed (e.g. due to reload) so here we
prevent closing and ensure sockets are reused when opened again.
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local t_insert, t_remove = table.insert, table.remove;
local _ENV = nil;
-- luacheck: std none
local new_filter_hooks = {};
local function initialize(session)
if not session.filters then
local filters = {};
session.filters = filters;
function session.filter(type, data)
local filter_list = filters[type];
if filter_list then
for i = 1, #filter_list do
data = filter_list[i](data, session);
if data == nil then break; end
end
end
return data;
end
end
for i=1,#new_filter_hooks do
new_filter_hooks[i](session);
end
return session.filter;
end
local function add_filter(session, type, callback, priority)
if not session.filters then
initialize(session);
end
local filter_list = session.filters[type];
if not filter_list then
filter_list = {};
session.filters[type] = filter_list;
elseif filter_list[callback] then
return; -- Filter already added
end
priority = priority or 0;
local i = 0;
repeat
i = i + 1;
until not filter_list[i] or filter_list[filter_list[i]] < priority;
t_insert(filter_list, i, callback);
filter_list[callback] = priority;
end
local function remove_filter(session, type, callback)
if not session.filters then return; end
local filter_list = session.filters[type];
if filter_list and filter_list[callback] then
for i=1, #filter_list do
if filter_list[i] == callback then
t_remove(filter_list, i);
filter_list[callback] = nil;
return true;
end
end
end
end
local function add_filter_hook(callback)
t_insert(new_filter_hooks, callback);
end
local function remove_filter_hook(callback)
for i=1,#new_filter_hooks do
if new_filter_hooks[i] == callback then
t_remove(new_filter_hooks, i);
end
end
end
return {
initialize = initialize;
add_filter = add_filter;
remove_filter = remove_filter;
add_filter_hook = add_filter_hook;
remove_filter_hook = remove_filter_hook;
};