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annotate mod_munin/mod_munin.lua @ 1630:0fcd63818aa1

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mod_storage_gdbm: Make write operation delete data when passed 'nil' as value instead of storing a literal "nil" string
author Kim Alvefur <zash@zash.se>
date Wed, 25 Mar 2015 17:39:29 +0100
parents 0f20390f6fa5
children 648ce9087902
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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 local set = require"util.set";
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8
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9 local meta = mt.new(); meta.data = module:shared"meta";
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10 local data = mt.new(); data.data = module:shared"data";
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11
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12 local munin_listener = {};
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13 local munin_commands = {};
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14
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15 local node_name = module:get_option_string("munin_node_name", "localhost");
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16 local ignore_stats = module:get_option_set("munin_ignored_stats", { });
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17
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18 local function clean_fieldname(name)
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19 return (name:gsub("[^A-Za-z0-9_]", "_"):gsub("^[^A-Za-z_]", "_%1"));
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20 end
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21
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22 function munin_listener.onconnect(conn)
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23 -- require"core.statsmanager".collect();
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24 conn:write("# munin node at "..node_name.."\n");
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25 end
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26
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27 function munin_listener.onincoming(conn, line)
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28 line = line and line:match("^[^\r\n]+");
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29 if type(line) ~= "string" then return end
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30 -- module:log("debug", "incoming: %q", line);
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31 local command = line:match"^%w+";
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32 command = munin_commands[command];
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33 if not command then
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34 conn:write("# Unknown command.\n");
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35 return;
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36 end
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37 local ok, err = pcall(command, conn, line);
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38 if not ok then
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39 module:log("error", "Error running %q: %s", line, err);
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40 conn:close();
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41 end
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42 end
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43
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44 function munin_listener.ondisconnect() end
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45
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46 function munin_commands.cap(conn)
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47 conn:write("cap\n");
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48 end
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49
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50 function munin_commands.list(conn, line)
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51 conn:write(array(it.keys(data.data)):concat(" ") .. "\n");
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52 end
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53
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54 function munin_commands.config(conn, line)
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55 -- TODO what exactly?
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56 local stat = line:match("%s(%S+)");
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57 if not stat then conn:write("# Unknown service\n.\n"); return end
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58 for key, name, k, value in meta:iter(stat, "", nil) do
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59 conn:write(s_format("%s %s\n", k, value));
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60 end
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61 for key, name, k, value in meta:iter(stat, nil, nil) do
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62 if name ~= "" then
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63 conn:write(s_format("%s.%s %s\n", name, k, value));
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64 end
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65 end
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66 conn:write(".\n");
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67 end
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68
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69 function munin_commands.fetch(conn, line)
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70 local stat = line:match("%s(%S+)");
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71 if not stat then conn:write("# Unknown service\n.\n"); return end
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72 for key, name, value in data:iter(stat, nil) do
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73 conn:write(s_format("%s.value %s\n", name, tostring(value)));
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74 end
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75 conn:write(".\n");
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76 end
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77
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78 function munin_commands.quit(conn)
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79 conn:close();
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80 end
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81
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82 module:hook("stats-updated", function (event)
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83 local all_stats, this = event.stats_extra;
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84 local host, sect, name, typ, key;
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85 for stat, value in pairs(event.changed_stats) do
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86 if not ignore_stats:contains(stat) then
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87 this = all_stats[stat];
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88 -- module:log("debug", "changed_stats[%q] = %s", stat, tostring(value));
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89 host, sect, name, typ = stat:match("^/([^/]+)/([^/]+)/(.+):(%a+)$");
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90 if host == nil then
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91 sect, name, typ, host = stat:match("^([^.]+)%.([^:]+):(%a+)$");
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92 elseif host == "*" then
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93 host = nil;
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94 end
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95 key = clean_fieldname(s_format("%s_%s_%s", host or "global", sect, typ));
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96
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97 if not meta:get(key) then
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98 if host then
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99 meta:set(key, "", "graph_title", s_format("%s %s on %s", sect, typ, host));
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100 else
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101 meta:set(key, "", "graph_title", s_format("Global %s %s", sect, typ, host));
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102 end
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103 meta:set(key, "", "graph_vlabel", this and this.units or typ);
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104 meta:set(key, "", "graph_category", sect);
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105
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106 meta:set(key, name, "label", name);
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107 elseif not meta:get(key, name, "label") then
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108 meta:set(key, name, "label", name);
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109 end
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110
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111 data:set(key, name, value);
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112 else
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113 -- module:log("debug", "Ignoring stat %q", stat);
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114 end
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115 end
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116 end);
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117
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118 module:provides("net", {
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119 listener = munin_listener;
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120 default_mode = "*l";
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121 default_port = 4949;
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122 });
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123