File

util/envload.lua @ 13186:affaf6d08d26

util.datamanager: Pad list writes to avoid crossing block boundaries By padding items so that they do not cross block boundaries, it becomes eaiser to delete whole blocks with fallocate() without cutting items in half, improving efficiency of such operations. Since list stores are used for message archives, where the most common deletion operation would be of the oldest entires, at the top of the file. With this, all blocks that contain items to be removed could be deleted without needing to read, delete and write out the whole file.
author Kim Alvefur <zash@zash.se>
date Wed, 07 Jun 2023 00:39:30 +0200
parent 12576:d1aacc6a81ac
line wrap: on
line source

-- Prosody IM
-- Copyright (C) 2008-2011 Florian Zeitz
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
-- luacheck: ignore 113/setfenv 113/loadstring

local load = load;
local io_open = io.open;

local function envload(code, source, env)
	return load(code, source, nil, env);
end

local function envloadfile(file, env)
	local fh, err, errno = io_open(file);
	if not fh then return fh, err, errno; end
	local f, err = load(fh:lines(2048), "@" .. file, nil, env);
	fh:close();
	return f, err;
end

return { envload = envload, envloadfile = envloadfile };