jdb/lib/jdb.js

A database that hacks.

// Generated by CoffeeScript 1.7.1
JDB.Jdb = (function() {
  function Jdb(options) {
    var Q, ego, fs, k, self, v;
    fs = require('fs');
    Q = require('q');
    self = {
      exec: function(opts) {
        var deferred, err, is_rolled_back, is_sent, jdb;
        if (ego.opts.promise) {
          deferred = Q.defer();
        }
        if (!opts.command) {
          return;
        }
        is_sent = false;
        is_rolled_back = false;
        jdb = {
          send: function(data) {
            if (is_sent) {
              return;
            } else {
              is_sent = true;
            }
            if (typeof opts.callback === "function") {
              opts.callback(null, data);
            }
            if (ego.opts.promise) {
              return deferred.resolve(data);
            }
          },
          save: function(data) {
            if (is_rolled_back) {
              return;
            }
            return ego.db_file.write("(" + opts.command + ")(jdb, " + (JSON.stringify(opts.data)) + ");\n", function() {
              return jdb.send(data);
            });
          },
          rollback: function() {
            ego.load_data();
            return is_rolled_back = true;
          }
        };
        Object.defineProperty(jdb, 'doc', {
          get: function() {
            return ego.doc;
          },
          set: function() {
            return console.error(">> Error: 'jdb.doc' is readonly.");
          }
        });
        try {
          opts.command(jdb, opts.data);
        } catch (_error) {
          err = _error;
          jdb.rollback();
          if (opts.callback) {
            opts.callback(err);
          } else {
            if (ego.opts.promise) {
              deferred.reject(err);
            }
          }
        }
        if (ego.opts.promise) {
          return deferred.promise;
        }
      },
      compact_db_file: function(callback) {
        var err, error;
        try {
          fs.writeFileSync(ego.opts.db_path, "var jdb = {\n	doc: " + (JSON.stringify(ego.doc)) + ",\n	send: function () {},\n	save: function () {},\n	rollback: function () {}\n};\n");
        } catch (_error) {
          err = _error;
          error = err;
        }
        if (callback) {
          return callback(error);
        } else if (error) {
          throw error;
        }
      }
    };
    ego = {
      opts: {
        db_path: 'jdb.db',
        compact_db_file: true,
        promise: false,
        error: null
      },
      doc: {},
      db_file: null,
      init: function() {
        ego.init_options();
        ego.init_db_file();
        return ego.db_file = fs.createWriteStream(ego.opts.db_path, {
          flags: 'a',
          encoding: 'utf8'
        });
      },
      init_options: function() {
        var k, v, _ref, _results;
        if (!options) {
          return;
        }
        _ref = ego.opts;
        _results = [];
        for (k in _ref) {
          v = _ref[k];
          if (options[k] !== void 0) {
            _results.push(ego.opts[k] = options[k]);
          } else {
            _results.push(void 0);
          }
        }
        return _results;
      },
      init_db_file: function() {
        if (fs.existsSync(ego.opts.db_path)) {
          ego.load_data();
          if (ego.opts.compact_db_file) {
            return self.compact_db_file();
          }
        } else {
          return self.compact_db_file();
        }
      },
      load_data: function() {
        var err, error, str;
        str = fs.readFileSync(ego.opts.db_path, 'utf8');
        try {
          eval(str);
          if (typeof jdb.doc === 'object') {
            ego.doc = jdb.doc;
          }
        } catch (_error) {
          err = _error;
          error = err;
        }
        if (ego.opts.error) {
          return ego.opts.error(error);
        } else if (error) {
          throw error;
        }
      }
    };
    for (k in self) {
      v = self[k];
      this[k] = v;
    }
    self = this;
    for (k in ego) {
      v = ego[k];
      if (typeof v === 'function') {
        v.bind(self);
      }
    }
    ego.init();
    return self;
  }

  return Jdb;

})();