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annotate mod_munin/mod_munin.lua @ 3656:3e0f4d727825

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mod_vcard_muc: Add an alternative method of signaling avatar change When the avatar has been changed, a signal is sent that the room configuration has changed. Clients then do a disco#info query to find the SHA-1 of the new avatar. They can then fetch it as before, or not if they have it cached already. This is meant to be less disruptive than signaling via presence, which caused problems for some clients. If clients transition to the new method, the old one can eventually be removed. The namespace is made up while waiting for standardization. Otherwise it is very close to what's described in https://xmpp.org/extensions/inbox/muc-avatars.html
author Kim Alvefur <zash@zash.se>
date Sun, 25 Aug 2019 20:46:43 +0200
parents c47cd8dbd310
children 7e5c8186f121
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0f20390f6fa5 mod_munin: Implementation of the Munin collection protocol
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1 module:set_global();
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2
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3 local s_format = string.format;
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4 local array = require"util.array";
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5 local it = require"util.iterators";
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6 local mt = require"util.multitable";
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7
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8 local meta = mt.new(); meta.data = module:shared"meta";
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9 local data = mt.new(); data.data = module:shared"data";
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10
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11 local munin_listener = {};
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12 local munin_commands = {};
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13
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14 local node_name = module:get_option_string("munin_node_name", "localhost");
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15 local ignore_stats = module:get_option_set("munin_ignored_stats", { });
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16
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17 local function clean_fieldname(name)
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18 return (name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1"));
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19 end
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20
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21 function munin_listener.onconnect(conn)
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22 -- require"core.statsmanager".collect();
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23 conn:write("# munin node at "..node_name.."\n");
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24 end
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25
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26 function munin_listener.onincoming(conn, line)
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27 line = line and line:match("^[^\r\n]+");
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28 if type(line) ~= "string" then return end
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29 -- module:log("debug", "incoming: %q", line);
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30 local command = line:match"^%w+";
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31 command = munin_commands[command];
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32 if not command then
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33 conn:write("# Unknown command.\n");
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34 return;
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35 end
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36 local ok, err = pcall(command, conn, line);
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37 if not ok then
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38 module:log("error", "Error running %q: %s", line, err);
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39 conn:close();
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40 end
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41 end
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42
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43 function munin_listener.ondisconnect() end
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44
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45 function munin_commands.cap(conn)
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46 conn:write("cap\n");
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47 end
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48
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49 function munin_commands.list(conn)
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50 conn:write(array(it.keys(data.data)):concat(" ") .. "\n");
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51 end
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52
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53 function munin_commands.config(conn, line)
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54 -- TODO what exactly?
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55 local stat = line:match("%s(%S+)");
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56 if not stat then conn:write("# Unknown service\n.\n"); return end
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57 for _, _, k, value in meta:iter(stat, "", nil) do
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58 conn:write(s_format("%s %s\n", k, value));
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59 end
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60 for _, name, k, value in meta:iter(stat, nil, nil) do
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61 if name ~= "" and not ignore_stats:contains(name) then
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62 conn:write(s_format("%s.%s %s\n", name, k, value));
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63 end
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64 end
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65 conn:write(".\n");
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66 end
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67
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68 function munin_commands.fetch(conn, line)
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69 local stat = line:match("%s(%S+)");
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70 if not stat then conn:write("# Unknown service\n.\n"); return end
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71 for _, name, value in data:iter(stat, nil) do
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72 if not ignore_stats:contains(name) then
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73 conn:write(s_format("%s.value %.12f\n", name, value));
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74 end
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75 end
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76 conn:write(".\n");
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77 end
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78
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79 function munin_commands.quit(conn)
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80 conn:close();
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81 end
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82
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83 module:hook("stats-updated", function (event)
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84 local all_stats, this = event.stats_extra;
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85 local host, sect, name, typ, key;
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86 for stat, value in pairs(event.changed_stats) do
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87 if not ignore_stats:contains(stat) then
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88 this = all_stats[stat];
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89 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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90 host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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91 if host == nil then
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92 sect, name, typ = stat:match("^([^.]+)%.(.+):(%a+)$");
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93 elseif host == "*" then
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94 host = nil;
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95 end
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96 if sect:find("^mod_measure_.") then
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97 sect = sect:sub(13);
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98 elseif sect:find("^mod_statistics_.") then
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99 sect = sect:sub(16);
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100 end
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101 key = clean_fieldname(s_format("%s_%s_%s", host or "global", sect, typ));
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102
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103 if not meta:get(key) then
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104 if host then
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105 meta:set(key, "", "graph_title", s_format("%s %s on %s", sect, typ, host));
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106 else
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107 meta:set(key, "", "graph_title", s_format("Global %s %s", sect, typ));
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108 end
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109 meta:set(key, "", "graph_vlabel", this and this.units or typ);
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110 meta:set(key, "", "graph_category", sect);
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111
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112 meta:set(key, name, "label", name);
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113 elseif not meta:get(key, name, "label") then
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114 meta:set(key, name, "label", name);
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115 end
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116
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117 data:set(key, name, value);
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118 end
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119 end
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120 end);
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121
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122 module:provides("net", {
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123 listener = munin_listener;
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124 default_mode = "*l";
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125 default_port = 4949;
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126 });
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127