mod_posix: Move everything to util.startup
This allows greater control over the order of events.
Notably, the internal ordering between daemonization, initialization of
libunbound and setup of signal handling is sensitive.
libunbound starts a separate thread for processing DNS requests.
If this thread is started before signal handling has been set up, it
will not inherit the signal handlers and instead behave as it would have
before signal handlers were set up, i.e. cause the whole process to
immediately exit.
libunbound is usually initialized on the first DNS request, usually
triggered by an outgoing s2s connection attempt.
If daemonization happens before signals have been set up, signals may
not be processed at all.
-- luacheck: ignore 213/i
local stanza_mt = require "prosody.util.stanza".stanza_mt;
local setmetatable = setmetatable;
local pairs = pairs;
local ipairs = ipairs;
local error = error;
local envload = require "prosody.util.envload".envload;
local debug = debug;
local t_remove = table.remove;
local parse_xml = require "prosody.util.xml".parse;
local _ENV = nil;
-- luacheck: std none
local function trim_xml(stanza)
for i=#stanza,1,-1 do
local child = stanza[i];
if child.name then
trim_xml(child);
else
child = child:gsub("^%s*", ""):gsub("%s*$", "");
stanza[i] = child;
if child == "" then t_remove(stanza, i); end
end
end
end
local function create_string_string(str)
str = ("%q"):format(str);
str = str:gsub("{([^}]*)}", function(s)
return '"..(data["'..s..'"]or"").."';
end);
return str;
end
local function create_attr_string(attr, xmlns)
local str = '{';
for name,value in pairs(attr) do
if name ~= "xmlns" or value ~= xmlns then
str = str..("[%q]=%s;"):format(name, create_string_string(value));
end
end
return str..'}';
end
local function create_clone_string(stanza, lookup, xmlns)
if not lookup[stanza] then
local s = ('setmetatable({name=%q,attr=%s,tags={'):format(stanza.name, create_attr_string(stanza.attr, xmlns));
-- add tags
for i,tag in ipairs(stanza.tags) do
s = s..create_clone_string(tag, lookup, stanza.attr.xmlns)..";";
end
s = s..'};';
-- add children
for i,child in ipairs(stanza) do
if child.name then
s = s..create_clone_string(child, lookup, stanza.attr.xmlns)..";";
else
s = s..create_string_string(child)..";"
end
end
s = s..'}, stanza_mt)';
s = s:gsub('%.%.""', ""):gsub('([=;])""%.%.', "%1"):gsub(';"";', ";"); -- strip empty strings
local n = #lookup + 1;
lookup[n] = s;
lookup[stanza] = "_"..n;
end
return lookup[stanza];
end
local function create_cloner(stanza, chunkname)
local lookup = {};
local name = create_clone_string(stanza, lookup, "");
local src = "local setmetatable,stanza_mt=...;return function(data)";
for i=1,#lookup do
src = src.."local _"..i.."="..lookup[i]..";";
end
src = src.."return "..name..";end";
local f,err = envload(src, chunkname);
if not f then error(err); end
return f(setmetatable, stanza_mt);
end
local template_mt = { __tostring = function(t) return t.name end };
local function create_template(templates, text)
local stanza, err = parse_xml(text);
if not stanza then error(err); end
trim_xml(stanza);
local info = debug.getinfo(3, "Sl");
info = info and ("template(%s:%d)"):format(info.short_src:match("[^\\/]*$"), info.currentline) or "template(unknown)";
local template = setmetatable({ apply = create_cloner(stanza, info), name = info, text = text }, template_mt);
templates[text] = template;
return template;
end
local templates = setmetatable({}, { __mode = 'k', __index = create_template });
return function(text)
return templates[text];
end;