Naive redis GET/SET server for Node.js.

redis_test.js

// Try with `redis-benchmark -t GET,SET -n 100000`

'use strict';
var net = require('net');
var split = require('split');

var db = {};
net.createServer(function(socket) {
  function sendError(err) {
    console.error(err);
    socket.write("-ERR " + err + "\r\n")
  }

  function execute(cmdArgs) {
    var name = cmdArgs[0];
    var first = cmdArgs[1];

    if (name === 'GET') {
        if (cmdArgs.length < 1) {
          sendError("GET expects 1 argument");
          return;
        }

        socket.write('$' + db[first].length + '\r\n' + first + '\r\n');
    }
    else if (name === 'SET') {
        if (cmdArgs.length < 2) {
          sendError("SET expects 2 arguments");
          return;
        }

        db[first] = cmdArgs[1];
        socket.write('+OK\r\n');
    }
    else {
        sendError("Unknown command: #" + name + "#");
    }
  }

  var waitForCmd = false;
  var argc = 0;
  var args = [];

  socket
    .pipe(split())
    .on('data', function(line) {
      if (waitForCmd) {
        waitForCmd = false;
        args.push(line);
        argc -= 1;
        if (argc === 0) {
          execute(args);
          args = [];
        }
        return;
      }

      if (!line) return;
      if (line.charAt(0) === '*') {
        argc = parseInt(line.substr(1));
        return;
      }

      else if (argc > 0 && line.charAt(0)=== '$') {
        waitForCmd = true;
      }
      else {
        sendError('Unexpected operation "' + line + '"')
      }
    });

  socket.on('error', function(e) { console.log(e) });
}).listen(6379);