cache-storage/lib/Storage/Async/FileStorage.js

[ABANDONED] Advanced cache storage for node js

// Generated by CoffeeScript 1.6.3
(function() {
  var Cache, FileStorage, Storage, fs, path,
    __hasProp = {}.hasOwnProperty,
    __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

  Storage = require('./Storage');

  Cache = require('../../Cache');

  fs = null;

  path = null;

  FileStorage = (function(_super) {
    __extends(FileStorage, _super);

    FileStorage.prototype.directory = null;

    FileStorage.prototype.allData = null;

    FileStorage.prototype.data = null;

    FileStorage.prototype.meta = null;

    function FileStorage(directory) {
      this.directory = directory;
      if (typeof window !== 'undefined') {
        throw new Error('FileStorage: Can not use this storage in browser');
      }
      fs = require('fs');
      path = require('path');
      this.directory = path.resolve(this.directory);
      if (!Cache.getFs().existsSync(this.directory)) {
        throw new Error('FileStorage: directory ' + this.directory + ' does not exists');
      }
      if (!Cache.getFs().statSync(this.directory).isDirectory()) {
        throw new Error('FileStorage: path ' + this.directory + ' must be directory');
      }
    }

    FileStorage.prototype.getFileName = function() {
      return this.directory + '/__' + this.cache.namespace + '.json';
    };

    FileStorage.prototype.loadData = function(fn) {
      var file,
        _this = this;
      if (this.allData === null) {
        file = this.getFileName();
        return Cache.getFs().exists(file, function(exists) {
          if (exists) {
            return Cache.getFs().readFile(file, {
              encoding: 'utf8'
            }, function(err, data) {
              if (err) {
                return fn(err, null);
              } else {
                _this.allData = JSON.parse(data);
                return fn(null, _this.allData);
              }
            });
          } else {
            _this.allData = {
              data: {},
              meta: {}
            };
            return fn(null, _this.allData);
          }
        });
      } else {
        return fn(null, this.allData);
      }
    };

    FileStorage.prototype.getData = function(fn) {
      return this.loadData(function(err, data) {
        return fn(err, data.data);
      });
    };

    FileStorage.prototype.getMeta = function(fn) {
      return this.loadData(function(err, data) {
        return fn(err, data.meta);
      });
    };

    FileStorage.prototype.writeData = function(data, meta, fn) {
      var file;
      this.data = data;
      this.meta = meta;
      this.allData = {
        data: this.data,
        meta: this.meta
      };
      file = this.getFileName();
      Cache.getFs().writeFile(file, JSON.stringify({
        data: this.data,
        meta: this.meta
      }), function(err) {
        if (err) {
          return fn(err);
        } else {
          return fn(null);
        }
      });
      return this;
    };

    return FileStorage;

  })(Storage);

  module.exports = FileStorage;

}).call(this);