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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> |
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date | Wed, 07 Jun 2023 00:39:30 +0200 |
parent | 12576:d1aacc6a81ac |
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-- 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 };