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annotate mod_pubsub_stats/mod_pubsub_stats.lua @ 4249:64aa1d9d70ac

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mod_rest: Catch and log errors in callback promise chain From the code it looks like it should be possible to reply to an error stanza, but it did not. Turns out I was saved by my local developer mode module which throws errors if an attempt is made to create an errror reply to an error stanza. However nothing collects this error from the promise, so all I got was confusion.
author Kim Alvefur <zash@zash.se>
date Sun, 15 Nov 2020 16:25:49 +0100
parents b2ce818ec19c
children
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b01ef74c9fc0 mod_pubsub_stats: Simple module that publishes stats in XEP-0039 format
Kim Alvefur <zash@zash.se>
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1 local st = require "util.stanza";
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2
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3 local pubsub = module:depends"pubsub";
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4
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5 local actor = module.host .. "/modules/" .. module.name;
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6
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7 local pubsub_xmlns = "http://jabber.org/protocol/pubsub"
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8
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9 local node = module:get_option_string(module.name .. "_node", "stats");
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10
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11 local function publish_stats(stats, stats_extra)
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12 local id = "current";
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13 local xitem = st.stanza("item", { xmlns = pubsub_xmlns, id = id })
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14 :tag("query", { xmlns = "http://jabber.org/protocol/stats" });
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16 for name, value in pairs(stats) do
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17 local stat_extra = stats_extra[name];
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18 local unit = stat_extra and stat_extra.units;
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19 xitem:tag("stat", { name = name, unit = unit, value = tostring(value) }):up();
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20 end
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21
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22 local ok, err = pubsub.service:publish(node, actor, id, xitem);
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23 if not ok then
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24 module:log("error", "Error publishing stats: %s", err);
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25 end
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26 end
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28 function module.load()
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29 pubsub.service:create(node, true, {
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30 persistent_items = false;
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31 max_items = 1;
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32 });
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33 pubsub.service:set_affiliation(node, true, actor, "publisher");
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34 end
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35
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36 module:hook_global("stats-updated", function (event)
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37 publish_stats(event.stats, event.stats_extra);
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38 end);
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39
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40 function module.unload()
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41 pubsub.service:delete(node, true);
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42 end
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43
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44 module:hook("pubsub-summary/http://jabber.org/protocol/stats", function (event)
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45 local payload = event.payload;
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46 local summary = {};
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47 for stat in payload:childtags("stat") do
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48 if stat.attr.name and stat.attr.value then
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49 table.insert(summary, string.format("%s: %g %s", stat.attr.name, tonumber(stat.attr.value), stat.attr.units or ""));
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50 end
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51 end
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52 table.sort(summary);
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53 return table.concat(summary, "\n");
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54 end);
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55