bitcrunch

redis backed analytics for node

bitcrunch

Probabilistic counters for node.js, backed by redis.

Note: not ready for production use.

Currently the only structure implemented is a linear counter. It hashes and maps input values to an internal linear identifier via redis-identity.

Basic logic

var bitcrunch = require('bitcrunch');
 
var won = bitcrunch('won');
var lost = bitcrunch('lost');
 
// winners 
 
won
.add('a+foobar@email.com')
.add('b+foobar@email.com')
.add('c+foobar@email.com');
 
// losers 
 
lost
.add('c+foobar@email.com')
.add('d+foobar@email.com');
 
 
// won AND lost 
 
won
.and(lost)
.count(function(errtotal){
  console.log('%s won and lost', total);
});
 
// won OR lost 
 
won
.or(lost)
.count(function(errtotal){
  console.log('%s won or lost', total);
});

Membership

var bitcrunch = require('bitcrunch');
 
var likes = bitcrunch('likes')
.add('js')
.add('lua')
.add('redis');
 
likes.includes('js', function(errresult){
  console.log('result = %s', result);
});
  • command-queue / promises for chaining (that works).
  • complex logic (and/or/and), kinda requires the promises.
  • do we really need to hash values (for linear).
  • max-size for linear
  • linear NOT.
  • linear XOR.
  • more counter types (HLL, Bloom, etc).

MIT