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net.server_epoll: Prevent stack overflow of opportunistic writes net.http.files serving a big enough file on a fast enough connection with opportunistic_writes enabled could trigger a stack overflow through repeatedly serving more data that immediately gets sent, draining the buffer and triggering more data to be sent. This also blocked the server on a single task until completion or an error. This change prevents nested opportunistic writes, which should prevent the stack overflow, at the cost of reduced download speed, but this is unlikely to be noticeable outside of Gbit networks. Speed at the cost of blocking other processing is not worth it, especially with the risk of stack overflow.

-- 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 unpack = table.unpack or unpack; --luacheck: ignore 113
local t_insert = table.insert;
function _G.import(module, ...)
	local m = package.loaded[module] or require(module);
	if type(m) == "table" and ... then
		local ret = {};
		for _, f in ipairs{...} do
			t_insert(ret, m[f]);
		end
		return unpack(ret);
	end
	return m;
end