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annotate mod_reload_components/mod_reload_components.lua @ 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 85d04dd87f14
children
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1 module:set_global();
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2
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3 local configmanager = require "core.configmanager";
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4 local hostmanager = require"core.hostmanager";
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5
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6 local function reload_components()
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7
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8 --- Check if host configuration is a component
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9 --- @param h hostname
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10 local function config_is_component(h)
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11 return h ~= nil and configmanager.get(h, "component_module") ~= nil; -- If a host has a component module defined within it, then it is a component
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12 end;
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13
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14 --- Check if host / component configuration is active
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15 --- @param h hostname / component name
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16 local function component_is_new(h)
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17 return h ~= "*" and not hosts[h]; -- If a host is not defined in hosts and it is not global, then it is new
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18 end
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19
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20 --- Search for new components that are not activated
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21 for h, c in pairs(configmanager.getconfig()) do
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22 if config_is_component(h) and component_is_new(h) then
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23 module:log ("debug", "Loading new component %s", h );
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24 hostmanager.activate(h, c);
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25 end
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26 end
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27
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28 --- Search for active components that are not enabled in the configmanager anymore
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29 local enabled = {}
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30 for h in pairs(configmanager.getconfig()) do
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31 enabled[h] = true; -- Set true if it is defined in the configuration file
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32 end
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33 for h, c in pairs(hosts) do
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34 if not enabled[h] then -- Deactivate if not present in the configuration file
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35 hostmanager.deactivate(h,c);
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36 end
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37 end
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38 end
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39
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40 module:hook("config-reloaded", reload_components);