Loggy-Log

Loggy-log makes it easy to create logs in pipes (like in ramda) based on a pino logger (formatted with pino-pretty)

Install

$ yarn add loggy-log

or

$ npm install loggy-log

Usage

Set offset of logs level

The values supported are trace, debug, info, warn and error.

PINO_LEVEL=info

you can do it easily with dotenv

By setting the level to info, you allow the logs of info and those above, i. e. warn and error

The default value is trace

Set logger title

You can set your log title when require loggy-log module

// test.js
const L = require('loggy-log')("Log Demo");
L.info('Initial message : %s')('hello world');

it will produce as result

[2020-02-22 13:13:42.196 +0000] INFO  (Log Demo): Initial message : hello world

But if you don't set a title, the default title is your filename:

// test.js
const L = require('loggy-log')();
L.info('Initial message : %s')('hello world');

it will produce as result

[2020-02-22 13:13:42.196 +0000] INFO  (test): Initial message : hello world

Utilisation

The logs functions are tap so can be use in pipe. there is an example with ramda:

const R = require('ramda');
const L = require('loggy-log')();

const main = R.pipe(
  L.info('Processing start'),
  L.debug('Initial value : %d'),
  R.add(5),
  L.debug('Add value : %d'),
  R.multiply(4),
  L.debug('Multiply value : %d'),
  R.objOf('data'),
  L.info('Final Object : %o')
);

main(2);

[2020-02-22 15:22:03.139 +0000] INFO  (test): Processing start
[2020-02-22 15:22:03.142 +0000] DEBUG (test): Initial value : 2
[2020-02-22 15:22:03.142 +0000] DEBUG (test): Add value : 7
[2020-02-22 15:22:03.142 +0000] DEBUG (test): Multiply value : 28
[2020-02-22 15:22:03.143 +0000] INFO  (test): Final Object : {"data":28}

But if you want to use the classic Pino logger, you can get it with L.getPino()

const L = require('loggy-log')();
const pino = L.getPino();
const a = 1;
const b = 2;
const c = a + b;
pino.info('%d + %d = %d', a, b, c);

[2020-02-22 15:23:55.207 +0000] INFO  (test): 1 + 2 = 3

Exposed functions

error, warn, info, debug, trace

a -> a -> a

Takes a, logs it, and returns a

Note about log

Got the same methods as before, but take another argument, placed first, which is the log level.

Extra feature

I thought than print object in log could be interesting but I found it difficult to read an object logged with "%o". So I created a new data type with "%fo". I will print out object using json-colorizer with option { pretty: true } So for exemple:

const R = require('ramda');
const L = require('loggy-log')();

const main = R.pipe(
  L.info('Processing start'),
  L.debug('Initial value : %d'),
  R.add(5),
  L.debug('Add value : %d'),
  R.multiply(4),
  L.debug('Multiply value : %d'),
  R.objOf('data'),
  L.info('Final Object : \n%fo')
);

main(2);

the result will be like that

[2020-03-08 16:12:46.142 +0000] INFO  (test): Processing start
[2020-03-08 16:12:46.150 +0000] DEBUG (test): Initial value : 2
[2020-03-08 16:12:46.150 +0000] DEBUG (test): Add value : 7
[2020-03-08 16:12:46.151 +0000] DEBUG (test): Multiply value : 28
[2020-03-08 16:12:46.153 +0000] INFO  (test): Final Object : 
{
  "data": 28
}