annotate mod_latex/mod_latex.lua @ 5668:ecfd7aece33b

mod_measure_modules: Report module statuses via OpenMetrics Someone in the chat asked about a health check endpoint, which reminded me of mod_http_status, which provides access to module statuses with full details. After that, this idea came about, which seems natural. As noted in the README, it could be used to monitor that critical modules are in fact loaded correctly. As more modules use the status API, the more useful this module and mod_http_status becomes.
author Kim Alvefur <zash@zash.se>
date Fri, 06 Oct 2023 18:34:39 +0200
parents df8da7e4c2bf
children
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1 local st = require "stanza";
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2 local urlencode = require "net.http".urlencode;
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4 local xmlns_xhtmlim = "http://jabber.org/protocol/xhtml-im";
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5 local xmlns_xhtml = "http://www.w3.org/1999/xhtml";
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7 local function replace_latex(data)
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8 local origin, stanza = data.origin, data.stanza;
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9 local body = stanza:get_child_text("body");
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10 if not body or not body:match("%$%$") then
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11 return;
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12 end
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13 module:log("debug", "Replacing latex...");
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14
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15 local html = st.stanza("html", { xmlns = xmlns_xhtmlim })
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16 :tag("body", { xmlns = xmlns_xhtml });
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18 local in_latex, last_char;
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19 for snippet, up_to in body:gmatch("(.-)%$%$()") do
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20 last_char = up_to;
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21 if in_latex then
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22 -- Render latex and add image, next snippet is text
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23 in_latex = nil;
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24 html:tag("img", { src = "http://www.mathtran.org/cgi-bin/mathtran?D=2;tex="..urlencode(snippet), alt = snippet }):up();
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25 else
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26 -- Add text to HTML, next snippet is latex
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27 in_latex = true;
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28 html:tag("span"):text(snippet):up();
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30 end
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31 end
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32 if last_char < #body then
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33 html:tag("span"):text(body:sub(last_char, #body)):up();
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34 end
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36 for n, tag in ipairs(stanza.tags) do
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37 module:log("debug", "Tag: %s|%s", tag.attr.xmlns or "", tag.name or "");
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38 if tag.name == "html" and tag.attr.xmlns == xmlns_xhtmlim then
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39 stanza.tags[n] = html;
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40 for n, child in ipairs(stanza) do
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41 if child == tag then
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42 stanza[n] = html;
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43 end
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44 end
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45 return;
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46 end
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47 end
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49 stanza[#stanza+1] = html;
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50 stanza.tags[#stanza.tags+1] = html;
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51 end
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53 module:hook("message/bare", replace_latex, 30);
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54 module:hook("message/full", replace_latex, 30);