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annotate mod_bob/mod_bob.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 41fbed2de482
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 module:depends("cache_c2s_caps");
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2
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3 local st = require "util.stanza";
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4 local encodings = require "util.encodings";
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5 local b64_encode = encodings.base64.encode;
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6 local b64_decode = encodings.base64.decode;
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7 local sha1 = require"util.hashes".sha1;
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8
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9 -- TODO: Move that to storage.
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10 local cache = {};
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11 -- TODO: use util.cache for this.
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12 local in_flight = {};
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13
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14 local function check_cid(src)
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15 return src:match("^cid:(%w+%+%w+@bob%.xmpp%.org)$");
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16 end
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17
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18 local function handle_data_carrier(tag)
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19 if tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then
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20 return tag;
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21 end
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22 local cid = tag.attr.cid;
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23 local media_type = tag.attr.type;
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24 local max_age = tag.attr['max-age'];
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25 local b64_content = tag:get_text();
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26 local content = b64_decode(b64_content);
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27 local hash = sha1(content, true);
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28 if cid ~= "sha1+"..hash.."@bob.xmpp.org" then
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29 module:log("debug", "Invalid BoB cid, %s ~= %s", cid, "sha1+"..hash.."@bob.xmpp.org");
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30 return nil;
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31 end
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32 cache[cid] = { media_type = media_type, max_age = max_age, content = content };
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33 if in_flight[cid] then
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34 local iq = st.iq({ type = "result", id = "fixme" });
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35 iq:add_direct_child(tag);
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36 for jid, data in pairs(in_flight[cid]) do
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37 iq.attr.from = data.from;
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38 iq.attr.to = jid;
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39 iq.attr.id = data.id;
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40 module:send(iq);
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41 end
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42 in_flight[cid] = nil;
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43 end
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44 return nil;
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45 end
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46
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47 local current_id = 0;
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48 local function send_iq(room_jid, jid, cid, log)
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49 local iq = st.iq({ type = "get", from = room_jid, to = jid, id = "bob-"..current_id })
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50 :tag("data", { xmlns = "urn:xmpp:bob", cid = cid });
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51 log("debug", "found BoB image in XHTML-IM, asking %s for cid %s", jid, cid);
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52 module:send(iq);
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53 in_flight[cid] = {};
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54 end
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55
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56 local function find_images(tag, jid, room_jid, log)
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57 if tag.name == "img" and tag.attr.xmlns == "http://www.w3.org/1999/xhtml" then
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58 local src = tag.attr.src;
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59 local cid = check_cid(src);
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60 if not cid then
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61 return;
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62 end
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63 if cache[cid] then
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64 log("debug", "cid %s already found in cache", cid);
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65 return;
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66 end
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67 if in_flight[cid] then
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68 log("debug", "cid %s already queried", cid);
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69 return;
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70 end
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71 send_iq(room_jid, jid, cid, log);
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72 return;
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73 end
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74 for child in tag:childtags(nil, "http://www.w3.org/1999/xhtml") do
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75 find_images(child, jid, room_jid, log);
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76 end
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77 end
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78
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79 local function message_handler(event)
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80 local stanza, origin = event.stanza, event.origin;
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81 local jid = stanza.attr.from;
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82 local room_jid = stanza.attr.to;
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83 local log = origin.log or module._log;
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84
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85 -- Remove and cache all <data/> elements embedded here.
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86 stanza:maptags(handle_data_carrier);
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87
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88 -- Find and query all of the cids not already cached.
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89 local tag = stanza:get_child("html", "http://jabber.org/protocol/xhtml-im");
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90 if not tag then
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91 return;
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92 end
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93 for body in tag:childtags("body", "http://www.w3.org/1999/xhtml") do
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94 find_images(body, jid, room_jid, log);
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95 end
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96 end
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97
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98 local function handle_data_get(stanza, cid, log)
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99 local data = cache[cid];
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100 if not data then
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101 log("debug", "BoB requested for data not in cache (cid %s), falling through.", cid);
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102 if in_flight[cid] then
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103 log("debug", "But an iq has already been sent, let’s wait…");
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104 in_flight[cid][stanza.attr.from] = { id = stanza.attr.id, from = stanza.attr.to };
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105 return true;
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106 end
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107 return nil;
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108 end
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109
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110 local iq = st.reply(stanza);
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111 iq:text_tag("data", b64_encode(data.content), {
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112 xmlns = "urn:xmpp:bob",
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113 cid = cid,
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114 type = data.media_type,
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115 ['max-age'] = data.max_age,
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116 });
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117 log("debug", "Answering BoB request for cid %s on the behalf of %s", cid, stanza.attr.to);
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118 module:send(iq);
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119 return true;
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120 end
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121
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122 local function iq_handler(event)
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123 local stanza, origin = event.stanza, event.origin;
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124 local tag = stanza.tags[1];
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125 if not tag or tag.name ~= "data" or tag.attr.xmlns ~= "urn:xmpp:bob" then
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126 return nil;
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127 end
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128 local log = origin.log or module._log;
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129 local cid = tag.attr.cid;
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130 if not cid then
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131 log("debug", "BoB iq doesn’t contain a cid attribute.");
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132 return;
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133 end
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134 if stanza.attr.type == "get" then
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135 return handle_data_get(stanza, cid, log);
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136 elseif stanza.attr.type == "result" then
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137 handle_data_carrier(tag);
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138 return true;
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139 end
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140 -- TODO: also handle error iqs.
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141 end
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142
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143 module:hook("message/bare", message_handler, 1);
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144 module:hook("iq/full", iq_handler, 1);
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145 module:hook("iq/bare", iq_handler, 1);