memecached/test/memcached-namespace.test.js

A fully featured Memcached API client, supporting both single and clustered Memcached servers through consistent hashing and failover/failure. Memcached is rewrite of nMemcached, which will be deprecated in the near future.

'use strict';

/**
 * Test dependencies
 */
var assert = require('assert')
  , fs = require('fs')
  , common = require('./common')
  , Memcached = require('../');

global.testnumbers = global.testnumbers || +(Math.random(10) * 1000000).toFixed();

/**
 * Expresso test suite for all `get` related
 * memcached commands
 */
describe('Memcached tests with Namespaces', function () {
  /**
   * Make sure that the string that we send to the server is correctly
   * stored and retrieved. We will be storing random strings to ensure
   * that we are not retrieving old data.
   */
  it("set with one namespace and verify it can't be read in another", function (done) {
    var memcached = new Memcached(common.servers.single)
        , message = common.alphabet(256)
        , testnr = ++global.testnumbers
        , callbacks = 0;

    // Load an non-namespaced entry to memcached
    memcached.set('test:' + testnr, message, 1000, function (error, ok) {
      ++callbacks;

      assert.ok(!error);
      ok.should.be.true;

      var memcachedOther = new Memcached(common.servers.single, {
        namespace: 'mySegmentedMemcached:'
      });

      // Try to load that memcache key with the namespace prepended - this should fail
      memcachedOther.get('test:' + testnr, function (error, answer) {
        ++callbacks;

        assert.ok(!error);
        ok.should.be.true;
        assert.ok(answer===undefined);

        // OK, now let's put it in with the namespace prepended
        memcachedOther.set('test:' + testnr, message, 1000, function (error, ok) {
          ++callbacks;

          assert.ok(!error);
          ok.should.be.true;

          // Now when we request it back, it should be there
          memcachedOther.get('test:' + testnr, function (error, answer) {
            ++callbacks;

            assert.ok(!error);

            assert.ok(typeof answer === 'string');
            answer.should.eql(message);

            memcachedOther.end(); // close connections
            assert.equal(callbacks, 4);
            done();
          });
        });
      });
    });
  });

  it('set, set, and multiget with custom namespace', function (done) {
    var memcached = new Memcached(common.servers.single, {
          namespace: 'mySegmentedMemcached:'
        })
      , callbacks = 0;

    // Load two namespaced variables into memcached
    memcached.set('test1', 'test1answer', 1000, function (error, ok) {
      ++callbacks;

      assert.ok(!error);
      ok.should.be.true;

      memcached.set('test2', 'test2answer', 1000, function (error, ok) {
        ++callbacks;

        assert.ok(!error);
        ok.should.be.true;

        memcached.get(['test1', 'test2'], function (error, answer) {
          ++callbacks;

          assert.ok(typeof answer === 'object');
          answer.test1.should.eql('test1answer');
          answer.test2.should.eql('test2answer');

          memcached.end(); // close connections

          assert.equal(callbacks, 3);
          done();
        });
      });
    });
  });

  /**
   * In this case, these keys will be allocated to servers like below.
   * test1,3,4 => :11211
   * test5     => :11212
   * test2     => :11213
   */
  it('multi get from multi server with custom namespace (inc. cache miss)', function (done) {
    var memcached = new Memcached(common.servers.multi, {
          namespace: 'mySegmentedMemcached:'
        })
      , callbacks = 0;

    // Load two namespaced variables into memcached
    memcached.set('test1', 'test1answer', 1000, function (error, ok) {
      ++callbacks;

      assert.ok(!error);
      ok.should.be.true;

      memcached.set('test2', 'test2answer', 1000, function (error, ok) {
        ++callbacks;

        assert.ok(!error);
        ok.should.be.true;

        memcached.get(['test1', 'test2', 'test3', 'test4', 'test5'], function (error, answer) {
          ++callbacks;
          assert.ok(typeof answer === 'object');
          answer.test1.should.eql('test1answer');
          answer.test2.should.eql('test2answer');
          answer.should.not.have.key('test3');
          answer.should.not.have.key('test4');
          answer.should.not.have.key('test5');

          memcached.end(); // close connections

          assert.equal(callbacks, 3);
          done();
        });
      });
    });
  });

  it('should allow namespacing on delete', function(done) {
    var memcached = new Memcached(common.servers.single, {
        namespace:'someNamespace:'
    }), callbacks = 0;

    // put a value
    memcached.set('test1', 'test1answer', 1000, function(error, ok) {
        callbacks++;
        assert.ok(!error);
        ok.should.be.true;

        // get it back
        memcached.get('test1', function(error,answer) {
            callbacks++;
            assert.ok(typeof answer === 'string');
            answer.should.eql('test1answer');

            //delete it
            memcached.del('test1', function(error) {
                callbacks++;
                assert.ok(!error);

                // no longer there
                memcached.get('test1', function(error,answer) {
                    callbacks++;
                    assert.ok(!error);
                    assert.ok(!answer);
                    memcached.end();
                    assert.equal(callbacks,4);
                    done();
                });
            });
        });
    });
  });

  it('should allow increment and decrement on namespaced values', function(done) {
    var memcached = new Memcached(common.servers.single, {
        namespace:'someNamespace:'
    }), callbacks = 0;

    // put a value
    memcached.set('test1', 1, 1000, function(error, ok) {
        callbacks++;
        assert.ok(!error);
        ok.should.be.true;

        // increment it
        memcached.incr('test1', 1, function(error) {
            callbacks++;
            assert.ok(!error);

            // get it back
            memcached.get('test1', function(error,answer) {
                callbacks++;
                assert.ok(!error);
                assert.ok(typeof answer === 'number');
                answer.should.be.eql(2);

                // decrement it
                memcached.decr('test1', 1, function(err) {
                    callbacks++;
                    assert.ok(!error);

                    // get it again
                    memcached.get('test1',function(error,answer) {
                        callbacks++;
                        assert.ok(!error);
                        assert.ok(typeof answer === 'number');
                        answer.should.be.eql(1);

                        //get rid of it
                        memcached.del('test1', function(error,answer) {
                            callbacks++;
                            assert.ok(!error);
                            memcached.end();
                            assert.equal(callbacks,6);
                            done();
                        });
                    });
                });
            });
        });
    });
  });
});