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Add raw memory visualization tool to redbean

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This change introduces a `-W /dev/pts/1` flag to redbean. What it does
is use the mincore() system call to create a dual-screen terminal
display that lets you troubleshoot the virtual address space. This is
useful since page faults are an important thing to consider when using a
forking web server. Now we have a colorful visualization of which pages
are going to fault and which ones are resident in memory.

The memory monitor, if enabled, spawns as a thread that just outputs
ANSI codes to the second terminal in a loop. In order to make this
happen using the new clone() polyfill, stdio is now thread safe.

This change also introduces some new demo pages to redbean. It also
polishes the demos we already have, to look a bit nicer and more
presentable for the upcoming release, with better explanations too.
This commit is contained in:
Justine Tunney 2022-05-14 04:33:58 -07:00
parent 578cb21591
commit 80b211e314
106 changed files with 1483 additions and 592 deletions
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59
tool/net/demo/maxmind.lua
View file

@ -1,3 +1,6 @@
-- redbean maxmind demo
-- by justine tunney
local maxmind = require "maxmind"
local kMetroCodes = {
@ -258,7 +261,7 @@ local function main()
local ip = nil
local geo = nil
local asn = nil
local value = ''
local value = '8.8.8.8'
if HasParam('ip') then
local geodb = maxmind.open('/usr/local/share/maxmind/GeoLite2-City.mmdb')
local asndb = maxmind.open('/usr/local/share/maxmind/GeoLite2-ASN.mmdb')
@ -279,18 +282,58 @@ local function main()
end
end
SetHeader('Content-Type', 'text/html; charset=utf-8')
Write('<!doctype html>\n')
Write([[
<title>maxmind redbean demo</title>
Write([[<!doctype html>
<title>redbean maxmind demo</title>
<style>
body { padding: 1em; }
h1 a { color: inherit; text-decoration: none; }
h1 img { border: none; vertical-align: middle; }
input { margin: 1em; padding: .5em; }
pre { margin-left: 2em; }
p { word-break: break-word; max-width: 650px; }
dt { font-weight: bold; }
dd { margin-top: 1em; margin-bottom: 1em; }
.hdr { text-indent: -1em; padding-left: 1em; }
</style>
<h1>
<a href="/"><img src="/redbean.png"></a>
<a href="maxmind.lua">redbean maxmind demo</a>
</h1>
<p>
Your redbean supports MaxMind GeoLite2 which is a free database
you have to download separately, at their <a
href="https://www.maxmind.com/en/geolite2/signup">website
here</a>. It's worth doing because it lets you turn IP addresses
into geographical coordinates, addresses, name it. Being able to
Lua script this database is going to help you address things like
online fraud and abuse.
</p>
<p>
This script is hard coded to assume the database is at the
following paths:
<ul>
<li><code>/usr/local/share/maxmind/GeoLite2-City.mmdb</code>
<li><code>/usr/local/share/maxmind/GeoLite2-ASN.mmdb</code>
</ul>
<p>
Which on Windows basically means the same thing as:
</p>
<ul>
<li><code>C:\usr\local\share\maxmind\GeoLite2-City.mmdb</code>
<li><code>C:\usr\local\share\maxmind\GeoLite2-ASN.mmdb</code>
</ul>
<p>
Once you've placed it there, you can fill out the form below to
have fun crawling all the information it provides!
</p>
<form action="maxmind.lua" method="get">
<input type="text" id="ip" name="ip" placeholder="8.8.8.8"
value="]] .. value .. [[">
value="%s" onfocus="this.select()" autofocus>
<label for="ip">ip address</label>
<br>
<input type="submit" value="Lookup">
<input type="submit" value="Lookup" autofocus>
</form>
]])
]] % {EscapeHtml(value)})
if ip then
Write('<h3>Maxmind Geolite DB</h3>')