odataserver2/odserverleveldb.js

OData server on top of MySQL and LeveDb

// imports
// =======

var LevelDbWriteStream = require('leveldbstreams').LevelDbWriteStream;
var LevelDbReadStream = require('leveldbstreams').LevelDbReadStream;

var levelup = require('levelup');

// Setup logging
// =============

var log = console.log.bind(console);
var info = console.info.bind(console, 'INFO');
var error = console.error.bind(console, 'ERROR');

var DEV_MODE = true;
var debug, debugStream;
if (DEV_MODE) {
  debug = console.log.bind(console, 'DEBUG');
  debugStream = process.stdout;
} else {
  debugStream = new require('stream').Writable();
  ws.write = function (d) {};
  debug = function () {};
}


var OD = function (filename) {
  this.db = levelup(filename);
};

OD.prototype.handleRequest = function () {
  var self = this;
  
  return function (req, res, next) {
    log(req.url, req.method);
    debug(req.headers);

    var key = req.url.substr(1);
    if (key === '') {
      res.end('Key is missing, URL should include a key');
      return;
    }

    if (req.method === 'POST') {
      var ws = new LevelDbWriteStream(null, self.db, key);
      req.pipe(ws);

      ws.on('finish', function () {
        res.end();
      });

      ws.on('error', function (err) {
        error(err);
      });
    }

    if (req.method === 'GET') {
      var rs = new LevelDbReadStream(null, self.db, key);

      rs.on('error', function (err) {
        error(err);
        res.end('' + err);
      });

      rs.pipe(res);
    }

  }
};

module.exports = OD;