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annotate mod_devices/mod_devices.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 4cf65afd90f4
children
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1 local it = require "util.iterators";
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2 local new_id = require "util.id".medium;
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3
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4 local max_user_devices = module:get_option_number("max_user_devices", 5);
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5
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6 local device_store = module:open_store("devices");
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7 local device_map_store = module:open_store("devices", "map");
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8
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9 --- Helper functions
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10
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11 local function _compare_device_timestamps(a, b)
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12 return (a.last_activity_at or 0) < (b.last_activity_at or 0);
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13 end
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14 local function sorted_devices(devices)
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15 return it.sorted_pairs(devices, _compare_device_timestamps);
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16 end
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17
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18 local function new_device(username, alt_ids)
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19 local current_time = os.time();
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20 local device = {
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21 id = "dv-"..new_id();
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22 created_at = current_time;
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23 last_activity = "created";
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24 last_activity_at = current_time;
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25 alt_ids = alt_ids or {};
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26 };
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27
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28 local devices = device_store:get(username);
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29 if not devices then
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30 devices = {};
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31 end
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32 devices[device.id] = device;
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33 local devices_ordered = {};
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34 for id in sorted_devices(devices) do
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35 table.insert(devices_ordered, id);
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36 end
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37 if #devices_ordered > max_user_devices then
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38 -- Iterate through oldest devices that are above limit, backwards
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39 for i = #devices_ordered, max_user_devices+1, -1 do
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40 local id = table.remove(devices_ordered, i);
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41 devices[id] = nil;
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42 module:log("debug", "Removing old device for %s: %s", username, id);
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43 end
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44 end
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45 device_store:set(username, devices);
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46 return device;
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47 end
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48
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49 local function get_device_with_alt_id(username, alt_id_type, alt_id)
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50 local devices = device_store:get(username);
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51 if not devices then
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52 return nil;
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53 end
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54
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55 for _, device in pairs(devices) do
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56 if device.alt_ids[alt_id_type] == alt_id then
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57 return device;
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58 end
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59 end
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60 end
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61
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62 local function set_device_alt_id(username, device_id, alt_id_type, alt_id)
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63 local devices = device_store:get(username);
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64 if not devices or not devices[device_id] then
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65 return nil, "no such device";
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66 end
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67 devices[device_id].alt_ids[alt_id_type] = alt_id;
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68 end
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69
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70 local function record_device_state(username, device_id, activity, time)
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71 local device = device_map_store:get(username, device_id);
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72 device.last_activity = activity;
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73 device.last_activity_at = time or os.time();
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74 device_map_store:set(username, device_id, device);
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75 end
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76
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77 local function find_device(username, info)
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78 for _, alt_id_type in ipairs({ "resumption_token", "resource" }) do
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79 local alt_id = info[alt_id_type];
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80 if alt_id then
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81 local device = get_device_with_alt_id(username, alt_id_type, alt_id);
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82 if device then
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83 return device, alt_id_type;
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84 end
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85 end
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86 end
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87 end
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88
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89 --- Information gathering
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90
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91 module:hook("pre-resource-bind", function (event)
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92 event.session.device_requested_resource = event.resource;
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93 end, 1000);
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94
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95
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96 local function store_resumption_token(session, stanza)
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97 session.device_requested_resume = stanza.attr.previd;
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98 end
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99 module:hook_stanza("urn:xmpp:sm:2", "resume", store_resumption_token, 5);
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100 module:hook_stanza("urn:xmpp:sm:3", "resume", store_resumption_token, 5);
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101
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102 --- Identify device after resource bind
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103
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104 module:hook("resource-bind", function (event)
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105 local info = {
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106 resource = event.session.device_requested_resource;
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107 resumption_token = event.session.device_requested_resume;
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108 };
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109 local device, source = find_device(event.session.username, info);
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110 if device then
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111 event.session.log("debug", "Associated with device %s (from %s)", device.id, source);
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112 event.session.device_id = device.id;
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113 else
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114 device = new_device(event.session.username, info);
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115 event.session.log("debug", "Creating new device %s for session", device.id);
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116 event.session.device_id = device.id;
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117 end
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118 record_device_state(event.session.username, device.id, "login");
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119 end, 1000);
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120
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121 module:hook("resource-unbind", function (event)
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122 if event.session.device_id then
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123 record_device_state(event.session.username, event.session.device_id, "logout");
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124 end
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125 end);