mof-statsdclient/index.js

middleware of floodesh, which provides a statsd client that allows you to send data to statsd server and automatically has some statistics sent that generally apply to all requests.

'use strict'

const StatsdClient = require('./lib/StatsdClient');
const os = require('os');

module.exports.middleware = function(statsdClient, sampleRate) {
	return function(ctx, next) {
		if(statsdClient && (statsdClient instanceof StatsdClient)) {
			let appname = ctx.app.name;
			let hostname = os.hostname();
			// let pid = process.pid;
			let memUsage = process.memoryUsage();
			statsdClient.gauge([appname,hostname,'mem_rss'].join('.'), memUsage.rss || 0);
			statsdClient.gauge([appname,hostname,'mem_heapTotal'].join('.'), memUsage.heapTotal || 0);
			statsdClient.gauge([appname,hostname,'mem_heapUsed'].join('.'), memUsage.heapUsed || 0);
			statsdClient.count([appname,hostname,'request_count'].join('.'), '1', sampleRate);
			statsdClient.timer([appname,hostname,'queue_time'].join('.'), ctx.performance.bottleneckTimestamp-ctx.performance.enqueueTimestamp, sampleRate);
			statsdClient.timer([appname,hostname,'requestmw_time'].join('.'), ctx.performance.requestTimestamp-ctx.performance.bottleneckTimestamp, sampleRate);
			statsdClient.timer([appname,hostname,'network_time'].join('.'), ctx.performance.responseTimestamp-ctx.performance.requestTimestamp, sampleRate);
			statsdClient.timer([appname,hostname,'reponsemw_time'].join('.'), ctx.performance.responsemwTimestamp-ctx.performance.responseTimestamp, sampleRate);
			statsdClient.timer([appname,hostname,'parse_time'].join('.'), ctx.performance.parsedTimestamp-ctx.performance.responsemwTimestamp, sampleRate);
			statsdClient.timer([appname,hostname,'total_time'].join('.'), ctx.performance.parsedTimestamp-ctx.performance.bottleneckTimestamp, sampleRate);
		}
		return next();
	}
}

module.exports.client = StatsdClient;