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aggregates.js
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aggregates.js
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var sys = require('sys');
var TimeBucketers;
if (!TimeBucketers) { TimeBucketers = {} };
TimeBucketers.closestSecondFor = function(floatApprox) {
return parseInt(floatApprox / 1000) * 1000;
}
TimeBucketers.closestMinuteFor = function(floatApprox) {
var date = new Date(timestamp);
date.setSeconds(0);
date.setMilliseconds(0);
return date.getTime();
};
TimeBucketers.closestHourFor = function(floatApprox) {
var date = new Date(timestamp);
date.setMinutes(0);
date.setSeconds(0);
date.setMilliseconds(0);
return date.getTime();
};
TimeBucketers.closestDayFor = function(timestamp) {
var date = new Date(timestamp);
date.setMinutes(0);
date.setHours(0);
date.setSeconds(0);
date.setMilliseconds(0);
return date.getTime();
}
Aggregates = function(collection) {
if ( !(this instanceof Aggregates) ) {
return new Aggregates(collection);
}
this.collection = collection;
}
Aggregates.prototype = {
mapper: function() {
this.timestamp.setMilliseconds(0);
this.timestamp.setSeconds(0);
// var timeBucket = timeBucketer(timestamp);
emit(this.timestamp, 1);
},
reducer: function(key, values) {
var total = 0;
for (var count = 0; count < values.length; ++count) {
total += values[count];
}
return { count: total };
},
lastHour: function(dataCallback) {
var now = new Date();
var oneHourAgo = new Date(now - (60 * 60 * 1000));
var result = this.collection.mapReduce(this.mapper, this.reducer, { query: { 'timestamp': { '$gte': new Date(oneHourAgo) } }, scope: { timeBucketer: TimeBucketers.closestMinuteFor } }, function(err, mrCollection) {
var metrics = [];
mrCollection.find({ 'timestamp': { '$gte': oneHourAgo } }, function(err, cursor) {
cursor.toArray(function(err, items) {
var visitsByMinute = {};
for (var i = 0; i < items.length; ++i) {
visitsByMinute[items[i]._id] = items[i].value.count;
}
var visits = [];
for (var i = 0; i < 60; ++i) {
var minuteTimestamp = new Date(oneHourAgo + (i * 60 * 1000));
var value = 0;
if (visitsByMinute[minuteTimestamp]) {
value = visitsByMinute[minuteTimestamp];
}
visits.push(value);
}
dataCallback(visits);
});
});
});
}
};
exports.Aggregates = Aggregates;
exports.TimeBucketers = TimeBucketers;