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annotate mod_munin/mod_munin.lua @ 3558:22587eb2d87c

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mod_adhoc_dataforms_demo: Add a multi-step command demo
author Kim Alvefur <zash@zash.se>
date Sat, 06 Apr 2019 18:32:24 +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