ts-timeframe v0.4.3

Ts-timeframe.js

A reliable, lightweight, fine grained javascript library for high performance backend applications, built with Typescript and with 100% code coverage. Supports measurement in second, millisecond, microsecond and nanoseconds units. It allows to measure individual events, but also to trigger callbacks according to defined rules.

This module is not suitable to use on the browser, (at least for now) because it depends on process.hrtime. It was created because I was seeing too many code using Date ms to measure performance and ms accuracy is not enough sometimes.

Installation

Using npm:

npm i --save ts-timeframe

Simple usage example measuring in miliseconds:

import { getDeltaMilliseconds, now, delay } from "ts-timeframe";

// we obtain start time with full precision
const start = now();

// do something
await delay(1);

// you can also use functions getDeltaUnits, getDeltaSeconds, getDeltaMicroseconds and getDeltaNanoseconds
console.log(getDeltaMilliseconds(start, now()));

Sample output:

0.149413

Simple usage example in typescript (constructor default is ms, 3 decimals):

import { Timeline } from "ts-timeframe";

// we start timeline in microseconds, no decimals in precision
const timeline = new Timeline(ITimelineUnit.Microseconds, 0);

timeline.measureEvent(async () => {
  // await for something
});

timeline.end();

console.log(timeline.getDuration());
console.log(timeline.generateAnalyticInfo());

Sample output (default is ms):

0.149413
***** Analytic Information for this Timeline *****
Total events: 1
Grand duration: 134 µs
Events duration: 24 µs

***** Event Detail for this Timeline *****
#1: [started: 83 µs, duration: 24 µs]

Changing defaults (callable once) and adding slowEvents rules:

import { ITimelineUnit, Timeline } from "ts-timeframe";

Timeline.init({
  unit: ITimelineUnit.Microseconds, // default unit for constructor class
  precision: 5, // decimals for unit

  // a list of event rules to trigger a callback
  // if they take longer than duration and label matches
  // with this you can log queries or requests,
  // all callbacks are called after timeline end.
  slowEvents: [
    {
      callback: (error, reply) => {
        console.log(
          `${reply.message}: details ${JSON.stringify(
            reply.details
          )} took more than ${reply.duration}${reply.unit}`
        );
      },
      rule: {
        duration: 10,
        matchAnylabel: ["database"],
        message: "Database too slow",
      },
    },
    {
      callback: () => {
        /* some action */
      },
      rule: {
        duration: 3000,
        matchAnylabel: ["api"],
        message: "Api calls too slow",
      },
    },
  ],
});

// timeline in microseconds, no decimals in precision
const timeline = new Timeline(ITimelineUnit.Microseconds, 0);

timeline.measureEvent(
  async () => {
    // await for something
  },
  // label the event and add info for the callback to receive
  ["database", "delete"],
  {
    server: "host1",
    table: "customers",
    query: "select abc",
  }
);

const event2 = timeline.startEvent();
event2.end();

timeline.end();

// get timeline duration
console.log(timeline.getDuration());
console.log(timeline.generateAnalyticInfo());

Sample output:

Database too slow: details {"server":"host1","table":"customers","query":"select abc"} took more than 10µs
135.109
***** Analytic Information for this Timeline *****
Total events: 2
Grand duration: 135 µs
Events duration: 28 µs

***** Event Detail for this Timeline *****
#1: [started: 74 µs, duration: 26 µs, labels: database,delete]
#2: [started: 110 µs, duration: 3 µs, labels: ]