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annotate mod_discodot/mod_discodot.tl @ 5668:ecfd7aece33b

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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 253df0798996
children
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253df0798996 mod_discodot: Print a graph of service discovery
Kim Alvefur <zash@zash.se>
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1 local cm = require"core.configmanager";
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2
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3 local function format_host(host:string, conf:{string:any}) : string
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4 if host == "*" then
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5 return "Global";
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6 end
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7 local component_module = conf["component_module"];
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8 if component_module is string then
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9 if component_module == "component" then
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10 return string.format("Component %q", host);
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11 else
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12 return string.format("Component %q %q", host, component_module);
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13 end
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14 else
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15 return string.format("VirtualHost %q", host);
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16 end
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17 end
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18
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19 function module.command(arg : { string }) : integer
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20
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21 local config : { string : { string : any } } = cm.getconfig();
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22
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23 print"digraph \"prosody\" {"
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24 for host, conf in pairs(config) do
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25 print(string.format("%q [label=%q]", host, format_host(host, conf)));
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26 local parent = host:match("%.(.*)");
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27 if parent and rawget(config, parent) then
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28 print(string.format("%q -> %q", parent, host));
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29 end
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Kim Alvefur <zash@zash.se>
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30 local disco_items = conf["disco_items"]
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31 if disco_items is { { string, string } } then
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32 for _, pair in ipairs(disco_items) do
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33 print(string.format("%q -> %q", host, pair[1]));
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34 end
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35 end
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36
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37 end
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38
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39 print"}"
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40
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41 return 0
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42 end