nodetime/lib/probes/fs.js

/*
 * Copyright (c) 2012 Dmitri Melikyan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to permit 
 * persons to whom the Software is furnished to do so, subject to the 
 * following conditions:
 * 
 * The above copyright notice and this permission notice shall be included 
 * in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN 
 * NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


var nt = require('../nodetime');
var proxy = require('../proxy');
var samples = require('../samples');


var commands = [
  'rename',
  'truncate',
  'chown',
  'fchown',
  'lchown',
  'chmod',
  'fchmod',
  'lchmod',
  'stat',
  'lstat',
  'fstat',
  'link',
  'symlink',
  'readlink',
  'realpath',
  'unlink',
  'rmdir',
  'mkdir',
  'readdir',
  'close',
  'open',
  'utimes',
  'futimes',
  'fsync',
  'write',
  'read',
  'readFile',
  'writeFile',
  'appendFile',
  'exists'
];


module.exports = function(obj) {
  commands.forEach(function(command) {
    proxy.before(obj, command, function(obj, args) {
      var trace = samples.stackTrace();
      var params = args;
      var time = samples.time("File System", command);

      proxy.callback(args, -1, function(obj, args) {
        if(!time.done()) return;
        if(nt.paused) return;

        var error = args.length > 0 ? (args[0] ? args[0].message : undefined) : undefined;
        var context = {'Type': 'File System',
            'Command': command, 
            'Arguments': samples.truncate(params),
            'Stack trace': trace,
            'Error': error};

        samples.add(time, context, 'File System: ' + context['Command']);
      });
    });

 
    var commandSync = command + 'Sync';
    proxy.around(obj, commandSync, function(obj, args, locals) {
      locals.stackTrace = samples.stackTrace();
      locals.params = args;
      locals.time = samples.time("File System", commandSync);

    }, function(obj, args, ret, locals) {
      if(!locals.time.done()) return;
      if(nt.paused) return;

      var context = {'Type': 'File System',
          'Command': commandSync, 
          'Arguments': samples.truncate(locals.params),
          'Stack trace': locals.stackTrace};

      samples.add(locals.time, context, 'File System: ' + context['Command']);
    });
  });
};