Mercurial > prosody-modules
view mod_statistics_mem/mod_statistics_mem.lua @ 4651:8231774f5bfd
mod_cloud_notify_encrypted: Ensure body substring remains valid UTF-8
The `body:sub()` call risks splitting the string in the middle of a
multi-byte UTF-8 sequence. This should have been caught by util.stanza
validation, but that would have caused some havoc, at the very least causing
the notification to not be sent.
There have been no reports of this happening. Likely because this module
isn't widely deployed among users with languages that use many longer UTF-8
sequences.
The util.encodings.utf8.valid() function is O(n) where only the last
sequence really needs to be checked, but it's in C and expected to be fast.
author | Kim Alvefur <zash@zash.se> |
---|---|
date | Sun, 22 Aug 2021 13:22:59 +0200 |
parents | 403d5cd924eb |
children |
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-- Probably Linux-specific memory statistics module:set_global(); local human; do local tostring = tostring; local s_format = string.format; local m_floor = math.floor; local m_max = math.max; local prefixes = "kMGTPEZY"; local multiplier = 1024; function human(num) num = tonumber(num) or 0; local m = 0; while num >= multiplier and m < #prefixes do num = num / multiplier; m = m + 1; end return s_format("%0."..m_max(0,3-#tostring(m_floor(num))).."f%sB", num, m > 0 and (prefixes:sub(m,m) .. "i") or ""); end end local pagesize = 4096; -- according to getpagesize() module:provides("statistics", { statistics = { memory_total = { -- virtual memory get = function () local statm, err = io.open"/proc/self/statm"; if statm then local total = statm:read"*n"; statm:close(); return total * pagesize; else module:log("debug", err); end end; tostring = human; }; memory_rss = { -- actual in-memory data size get = function () local statm, err = io.open"/proc/self/statm"; if statm then statm:read"*n"; -- Total size, ignore local rss = statm:read"*n"; statm:close(); return rss * pagesize; else module:log("debug", err); end end; tostring = human; }; } });