plugins.d/node.d.plugin

   1 #!/usr/bin/env bash
   2 ':' //; exec "$(command -v nodejs || command -v node || command -v js || echo "ERROR node.js IS NOT AVAILABLE IN THIS SYSTEM")" "$0" "$@"
   3
   4 // shebang hack from:
   5 // http://unix.stackexchange.com/questions/65235/universal-node-js-shebang
   6
   7 // Initially this is run as a shell script (#!/bin/sh).
   8 // Then, the second line, finds nodejs or node or js in the system path
   9 // and executes it with the shell parameters.
  10
  11 // --------------------------------------------------------------------------------------------------------------------
  12
  13 'use strict';
  14
  15 // --------------------------------------------------------------------------------------------------------------------
  16 // get NETDATA environment variables
  17
  18 var NETDATA_PLUGINS_DIR = process.env.NETDATA_PLUGINS_DIR || __dirname;
  19 var NETDATA_CONFIG_DIR = process.env.NETDATA_CONFIG_DIR || '/etc/netdata';
  20 var NETDATA_UPDATE_EVERY = process.env.NETDATA_UPDATE_EVERY || 1;
  21 var NODE_D_DIR = NETDATA_PLUGINS_DIR + '/../node.d';
  22
  23 // make sure the modules are found
  24 process.mainModule.paths.unshift(NODE_D_DIR + '/node_modules');
  25 process.mainModule.paths.unshift(NODE_D_DIR);
  26
  27
  28 // --------------------------------------------------------------------------------------------------------------------
  29 // load required modules
  30
  31 var fs = require('fs');
  32 var url = require('url');
  33 var http = require('http');
  34 var path = require('path');
  35 var extend = require('extend');
  36 var netdata = require('netdata');
  37
  38
  39 // --------------------------------------------------------------------------------------------------------------------
  40 // configuration
  41
  42 function pluginConfig(filename) {
  43         var f = path.basename(filename);
  44
  45         // node.d.plugin configuration
  46         var m = f.match('.plugin' + '$');
  47         if(m !== null)
  48                 return netdata.options.paths.config + '/' + f.substring(0, m.index) + '.conf';
  49
  50         // node.d modules configuration
  51         m = f.match('.node.js' + '$');
  52         if(m !== null)
  53                 return netdata.options.paths.config + '/node.d/' + f.substring(0, m.index) + '.conf';
  54
  55         return netdata.options.paths.config + '/node.d/' + f + '.conf';
  56 }
  57
  58 // internal defaults
  59 extend(true, netdata.options, {
  60         filename: path.basename(__filename),
  61
  62         update_every: NETDATA_UPDATE_EVERY,
  63
  64         exit_after_ms: 3600 * 4 * 1000,
  65
  66         paths: {
  67                 plugins: NETDATA_PLUGINS_DIR,
  68                 config: NETDATA_CONFIG_DIR,
  69                 modules: [],
  70         },
  71
  72         modules_enable_autodetect: true,
  73         modules_enable_all: true,
  74         modules: {},
  75 });
  76 netdata.options.config_filename = pluginConfig(__filename);
  77
  78 // load configuration file
  79 try {
  80         netdata.options_loaded = JSON.parse(fs.readFileSync(netdata.options.config_filename, 'utf8'));
  81         extend(true, netdata.options, netdata.options_loaded);
  82         console.error('merged netdata object:');
  83         console.error(netdata);
  84 }
  85 catch(e) {
  86         netdata.error('Cannot read configuration file ' + netdata.options.config_filename + ': ' + e.message + ', using internal defaults.');
  87         netdata.options_loaded = undefined;
  88         dumpError(e);
  89 }
  90
  91
  92 // apply module paths to node.js process
  93 function applyModulePaths() {
  94         var len = netdata.options.paths.modules.length;
  95         while(len--)
  96                 process.mainModule.paths.unshift(netdata.options.paths.modules[len]);
  97 }
  98 applyModulePaths();
  99
 100
 101 // --------------------------------------------------------------------------------------------------------------------
 102 // tracing
 103
 104 function dumpError(err) {
 105         if (typeof err === 'object') {
 106                 if (err.stack) {
 107                         netdata.debug(err.stack);
 108                 }
 109         }
 110 }
 111
 112 // --------------------------------------------------------------------------------------------------------------------
 113 // get command line arguments
 114 {
 115         var found_myself = false;
 116         var found_number = false;
 117         var found_modules = false;
 118         process.argv.forEach(function (val, index, array) {
 119                 netdata.debug('PARAM: ' + val);
 120
 121                 if(!found_myself) {
 122                         if(val === __filename)
 123                                 found_myself = true;
 124                 }
 125                 else {
 126                         switch(val) {
 127                                 case 'debug':
 128                                         netdata.options.DEBUG = true;
 129                                         netdata.debug('DEBUG enabled');
 130                                         break;
 131
 132                                 default:
 133                                         if(found_number === true) {
 134                                                 if(found_modules === false) {
 135                                                         for(var i in netdata.options.modules)
 136                                                                 netdata.options.modules[i].enabled = false;
 137                                                 }
 138
 139                                                 if(typeof netdata.options.modules[val] === 'undefined')
 140                                                         netdata.options.modules[val] = {};
 141
 142                                                 netdata.options.modules[val].enabled = true;
 143                                                 netdata.options.modules_enable_all = false;
 144                                                 netdata.debug('enabled module ' + val);
 145                                         }
 146                                         else {
 147                                                 try {
 148                                                         var x = parseInt(val);
 149                                                         if(x > 0) {
 150                                                                 netdata.options.update_every = x;
 151                                                                 if(netdata.options.update_every < NETDATA_UPDATE_EVERY) {
 152                                                                         netdata.options.update_every = NETDATA_UPDATE_EVERY;
 153                                                                         netdata.debug('Update frequency ' + x + 's is too low');
 154                                                                 }
 155
 156                                                                 found_number = true;
 157                                                                 netdata.debug('Update frequency set to ' + netdata.options.update_every + ' seconds');
 158                                                         }
 159                                                         else netdata.error('Ignoring parameter: ' + val);
 160                                                 }
 161                                                 catch(e) {
 162                                                         netdata.error('Cannot get value of parameter: ' + val);
 163                                                         dumpError(e);
 164                                                 }
 165                                         }
 166                                         break;
 167                         }
 168                 }
 169         });
 170 }
 171
 172 if(netdata.options.update_every < 1) {
 173         netdata.debug('Adjusting update frequency to 1 second');
 174         netdata.options.update_every = 1;
 175 }
 176
 177 // --------------------------------------------------------------------------------------------------------------------
 178 // find modules
 179
 180 function findModules() {
 181         var found = 0;
 182
 183         var files = fs.readdirSync(NODE_D_DIR);
 184         var len = files.length;
 185         while(len--) {
 186                 var m = files[len].match('.node.js' + '$');
 187                 if(m !== null) {
 188                         var n = files[len].substring(0, m.index);
 189
 190                         if(typeof(netdata.options.modules[n]) === 'undefined')
 191                                 netdata.options.modules[n] = { name: n, enabled: netdata.options.modules_enable_all };
 192
 193                         if(netdata.options.modules[n].enabled === true) {
 194                                 netdata.options.modules[n].name = n;
 195                                 netdata.options.modules[n].filename = NODE_D_DIR + '/' + files[len];
 196                                 netdata.options.modules[n].loaded = false;
 197
 198                                 if(typeof(netdata.options.modules[n].config_filename) !== 'string')
 199                                         netdata.options.modules[n].config_filename = pluginConfig(files[len]);
 200
 201                                 // load the module
 202                                 try {
 203                                         netdata.debug('loading module ' + netdata.options.modules[n].filename);
 204                                         netdata.options.modules[n].module = require(netdata.options.modules[n].filename);
 205                                         netdata.options.modules[n].module.name = n;
 206                                         netdata.debug('loaded module ' + netdata.options.modules[n].name + ' from ' + netdata.options.modules[n].filename);
 207                                 }
 208                                 catch(e) {
 209                                         netdata.options.modules[n].enabled = false;
 210                                         netdata.error('Cannot load module: ' + netdata.options.modules[n].filename + ' exception: ' + e);
 211                                         dumpError(e);
 212                                         continue;
 213                                 }
 214
 215                                 // load its configuration
 216                                 var c = {
 217                                         enable_autodetect: netdata.options.modules_enable_autodetect,
 218                                         update_every: netdata.options.update_every
 219                                 };
 220                                 try {
 221                                         netdata.debug('loading module\'s ' + netdata.options.modules[n].name + ' config ' + netdata.options.modules[n].config_filename);
 222                                         var c2 = JSON.parse(fs.readFileSync(netdata.options.modules[n].config_filename, 'utf8'));
 223                                         extend(true, c, c2);
 224                                         netdata.debug('loaded module\'s ' + netdata.options.modules[n].name + ' config ' + netdata.options.modules[n].config_filename);
 225                                 }
 226                                 catch(e) {
 227                                         netdata.error('Cannot load module\'s ' + netdata.options.modules[n].name + ' config from ' + netdata.options.modules[n].config_filename + ' exception: ' + e + ', using internal defaults.');
 228                                         dumpError(e);
 229                                 }
 230
 231                                 // call module auto-detection / configuration
 232                                 try {
 233                                         netdata.modules_configuring++;
 234                                         netdata.debug('Configuring module ' + netdata.options.modules[n].name);
 235                                         var serv = netdata.configure(netdata.options.modules[n].module, c, function() {
 236                                                 netdata.debug('Configured module ' + netdata.options.modules[n].name);
 237                                                 netdata.modules_configuring--;
 238                                         });
 239
 240                                         netdata.debug('Configuring module ' + netdata.options.modules[n].name + ' reports ' + serv + ' eligible services.');
 241                                 }
 242                                 catch(e) {
 243                                         netdata.modules_configuring--;
 244                                         netdata.options.modules[n].enabled = false;
 245                                         netdata.error('Failed module auto-detection: ' + netdata.options.modules[n].name + ' exception: ' + e + ', disabling module.');
 246                                         dumpError(e);
 247                                         continue;
 248                                 }
 249
 250                                 netdata.options.modules[n].loaded = true;
 251                                 found++;
 252                         }
 253                 }
 254         }
 255
 256         // netdata.debug(netdata.options.modules);
 257         return found;
 258 }
 259
 260 if(findModules() === 0) {
 261         netdata.error('Cannot load any .node.js module from: ' + NODE_D_DIR);
 262         netdata.disableNodePlugin();
 263         process.exit(1);
 264 }
 265
 266
 267 // --------------------------------------------------------------------------------------------------------------------
 268 // start
 269
 270 function start_when_configuring_ends() {
 271         if(netdata.modules_configuring > 0) {
 272                 netdata.debug('Waiting modules configuration, still running ' + netdata.modules_configuring);
 273                 setTimeout(start_when_configuring_ends, 500);
 274                 return;
 275         }
 276
 277         netdata.modules_configuring = 0;
 278         netdata.start();
 279 }
 280 start_when_configuring_ends();
 281
 282 //netdata.debug('netdata object:')
 283 //netdata.debug(netdata);