prosody-modules
622c6308d7af
mod_pubsub_alertmanager/mod_pubsub_alertmanager.lua

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mod_pubsub_alertmanager/mod_pubsub_alertmanager.lua @ 4623:622c6308d7af

mod_pubsub_alertmanager: Minimal example of Prometheus and Alertmanager config
author Kim Alvefur <zash@zash.se>
date Fri, 16 Jul 2021 17:34:24 +0200
parent 4621:ebc2c099a11b
child 4625:f7e26c43a9bc
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43c54a27bab2 mod_pubsub_post: Module to publish to pubsub nodes from a simple HTTP POST
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1 local st = require "util.stanza";
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2 local json = require "util.json";
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3 local filters = {};
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4 local render = require "util.interpolation".new("%b{}", tostring, filters);
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5 local uuid_generate = require "util.uuid".generate;
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6
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7 module:depends("http");
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8
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9 local pubsub_service = module:depends("pubsub").service;
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10
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11 local error_mapping = {
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12 ["forbidden"] = 403;
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13 ["item-not-found"] = 404;
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14 ["internal-server-error"] = 500;
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15 ["conflict"] = 409;
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16 };
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17
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18 local function publish_payload(node, actor, item_id, payload)
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19 local post_item = st.stanza("item", { xmlns = "http://jabber.org/protocol/pubsub", id = item_id, })
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20 :add_child(payload);
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21 local ok, err = pubsub_service:publish(node, actor, item_id, post_item);
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22 module:log("debug", ":publish(%q, true, %q, %s) -> %q", node, item_id, payload:top_tag(), err or "");
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23 if not ok then
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24 return error_mapping[err] or 500;
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25 end
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26 return 202;
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27 end
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28
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29 local node_template = module:get_option_string("alertmanager_node_template", "{path?alerts}");
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30
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31 function handle_POST(event, path)
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32 local request = event.request;
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33
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34 local payload = json.decode(event.request.body);
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35 if type(payload) ~= "table" then return 400; end
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36 if payload.version ~= "4" then return 501; end
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37
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38 for _, alert in ipairs(payload.alerts) do
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39 local item = st.stanza("alerts", {xmlns = "urn:uuid:e3bec775-c607-4e9b-9a3f-94de1316d861:v4", status=alert.status});
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40 for k, v in pairs(alert.annotations) do
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41 item:text_tag("annotation", v, { name=k });
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42 end
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43 for k, v in pairs(alert.labels) do
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44 item:text_tag("label", v, { name=k });
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45 end
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46 item:tag("starts", { at = alert.startsAt}):up();
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47 if alert.endsAt then
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48 item:tag("ends", { at = alert.endsAt }):up();
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49 end
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50 if alert.generatorURL then
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51 item:tag("link", { href=alert.generatorURL }):up();
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52 end
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53
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54 local node = render(node_template, {alert = alert, path = path, payload = payload, request = request});
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55 local ret = publish_payload(node, request.ip, uuid_generate(), item);
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56 if ret ~= 202 then
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57 return ret
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58 end
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59 end
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60 return 202;
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61 end
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62
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63 local template = module:get_option_string("alertmanager_body_template", [[
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64 *ALARM!*
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65 Status: {status}
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66 Starts at: {startsAt}{endsAt&
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67 Ends at: {endsAt}}
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68 Labels: {labels%
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69 {idx}: {item}}
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70 Annotations: {annotations%
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71 {idx}: {item}}
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72 ]]);
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73
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74 module:hook("pubsub-summary/urn:uuid:e3bec775-c607-4e9b-9a3f-94de1316d861:v4", function(event)
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75 local payload = event.payload;
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76
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77 local data = {
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78 status = payload.attr.status,
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79 annotations = {},
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80 labels = {},
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81 endsAt = payload:find("ends/@at"),
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82 startsAt = payload:find("starts/@at"),
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83 };
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84 for label in payload:childtags("label") do
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85 data.labels[tostring(label.attr.name)] = label:get_text();
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86 end
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87 for annotation in payload:childtags("annotation") do
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88 data.annotations[tostring(annotation.attr.name)] = annotation:get_text();
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89 end
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90
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91 return render(template, data);
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92 end);
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93
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94 module:provides("http", {
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95 route = {
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96 ["POST /*"] = handle_POST;
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97 ["POST"] = handle_POST;
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98 };
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99 });