hit.js

var mongoose = require('mongoose');
var fs = require('fs');
module.exports = function(instance) {

  return function(req, res, next) {
    
    var now = Date.now();
    var chart_name = req.params.chart.toLowerCase();

    res.writeHead(200, {
      'Content-Type': 'image/gif',
      'Content-Length': instance.punchbag.IMG_DATA.length,
      'Cache-Control': 'private, max-age=0'
    });
    res.end(instance.punchbag.IMG_BUFFER, 'binary');

    instance.punchbag.mongodb.getCollection('point', function(err, collection) {
      if (err) {
        return instance.logger.error(error);
      }

      collection.update(
        { c: chart_name, p: now / 1000 },
        { $inc: { n: 1 } },
        { upsert: true },
        function(error, point) {
          if (error) {
            return instance.logger.error(error);
          }

          instance.punchbag.mongodb.getCollection('agg', function(err, aggrigate) {

            function aggperiod( kind, period, offset ) {
              var pval = Math.floor( ((now / 1000) + offset) / period );

              aggrigate.update(
                { c: chart_name, k: kind, p: pval },
                { $inc: { n: 1 } },
                { upsert: true }, function(error, p) {
                  if (error) {
                    return instance.logger.error(error);
                  }
                });
            }

            instance.punchbag.PERIODS.forEach(function(p){
              aggperiod(p[0], p[1], p[2]);
            });

            function aggdirect( kind, pval ) {
              aggrigate.update(
                { c: chart_name, k:kind, p:pval },
                { $inc: { n: 1 } },
                { upsert: true }, function(error, p) {
                  if (error) {
                    return instance.logger.error(error);
                  }
                });
            }

            var at = (new Date(now));
            var y = at.getUTCFullYear() - 1970;
            var n = ( 1 + at.getUTCMonth()) + ( 12 * y );
            var q = y * 4 + (1 + Math.floor(at.getUTCMonth() / 3));
            [
              [ 'n', n ],
              [ 'q', q],
              [ 'y', y]
            ].forEach(function(p) {
              aggdirect(p[0], p[1]);
            });
          });
        }
      );
    });
  
  };

};