@segment/analytics.js-core/build/metrics.js

The hassle-free way to integrate analytics into any web application.

'use strict';
Object.defineProperty(exports, "__esModule", { value: true });
var bindAll = require('bind-all');
var send = require('@segment/send-json');
var debug = require('debug')('analytics.js:metrics');
function Metrics(options) {
    this.options(options);
}
/**
 * Set the metrics options.
 */
Metrics.prototype.options = function (options) {
    options = options || {};
    this.host = options.host || 'api.segment.io/v1';
    this.sampleRate = options.sampleRate || 0; // disable metrics by default.
    this.flushTimer = options.flushTimer || 30 * 1000 /* 30s */;
    this.maxQueueSize = options.maxQueueSize || 20;
    this.queue = [];
    if (this.sampleRate > 0) {
        var self = this;
        setInterval(function () {
            self._flush();
        }, this.flushTimer);
    }
};
/**
 * Increments the counter identified by name and tags by one.
 */
Metrics.prototype.increment = function (metric, tags) {
    if (Math.random() > this.sampleRate) {
        return;
    }
    if (this.queue.length >= this.maxQueueSize) {
        return;
    }
    this.queue.push({ type: 'Counter', metric: metric, value: 1, tags: tags });
    // Trigger a flush if this is an error metric.
    if (metric.indexOf('error') > 0) {
        this._flush();
    }
};
/**
 * Flush all queued metrics.
 */
Metrics.prototype._flush = function () {
    var self = this;
    if (self.queue.length <= 0) {
        return;
    }
    var payload = { series: this.queue };
    var headers = { 'Content-Type': 'text/plain' };
    self.queue = [];
    // This endpoint does not support jsonp, so only proceed if the browser
    // supports xhr.
    if (send.type !== 'xhr')
        return;
    send('https://' + this.host + '/m', payload, headers, function (err, res) {
        debug('sent %O, received %O', payload, [err, res]);
    });
};
/**
 * Expose the metrics singleton.
 */
module.exports = bindAll(new Metrics());
/**
 * Expose the `Metrics` constructor.
 */
module.exports.Metrics = Metrics;