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.
local gettime = require "prosody.util.time".now
local setmetatable = setmetatable;
local _ENV = nil;
-- luacheck: std none
local throttle = {};
local throttle_mt = { __index = throttle };
function throttle:update()
local newt = gettime();
local elapsed = newt - self.t;
self.t = newt;
local balance = (self.rate * elapsed) + self.balance;
if balance > self.max then
self.balance = self.max;
else
self.balance = balance;
end
return self.balance;
end
function throttle:peek(cost)
cost = cost or 1;
return self.balance >= cost or self:update() >= cost;
end
function throttle:poll(cost, split)
if self:peek(cost) then
self.balance = self.balance - cost;
return true;
else
local balance = self.balance;
if split then
self.balance = 0;
end
return false, balance, (cost-balance);
end
end
local function create(max, period)
return setmetatable({ rate = max / period, max = max, t = gettime(), balance = max }, throttle_mt);
end
return {
create = create;
};