common-logger

Common-logger is a utility that takes a set of configuration parameters and returns a logger.

Common-logger currently supports two log types: Console(stdout), File(stream).

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Install

Run npm i @pillarwallet/common-logger

Examples

Instantiate a logger with default options (just writing out to Console):
@param level - (optional) set the level for a single output stream
@param name - (required) name of Log
@param path - (optional) Specify the file path to which log records are written
@param src - (optional - default false). Set true to enable 'src' automatic field with log call source info

const buildLogger = require('@pillarwallet/common-logger');

const logger = buildLogger({ level: 'info', name: 'logTest', path: __dirname , src: false });
logger.info('Logger Info Hey!');
logger.warn('Logger Warn Hey!');
logger.fatal('Logger Fatal Hey!');
logger.error('Logger Error Hey!');
// with serializer
// "serializer" functions to produce a JSON-able object from a JavaScript object, so you can easily do the following:
const req = {
  method: req.method,
  url: req.url,
  headers: req.headers
};
logger.info(req, 'Logger Info Test!');

To use HTTP request logger middleware, just follow the example:

const express = require('express');

const app = express();

app.use(logger.middleware());

Standard serializers are:

Field	Description
err	Used for serializing JavaScript error objects, including traversing an error's cause chain for error objects with a .cause() -- e.g. as from verror.
req	Common fields from a node.js HTTP request object.
res	Common fields from a node.js HTTP response object.

API

Members

Constructor ⇒

This is the constructor of the Logger instance. It allows to set Configuration keys:

middleware

use this method as middleware to log http requests.

Functions

httpHeaderParser(string, begin, end) ⇒ string

Simple string parser

Constructor ⇒

This is the constructor of the Logger instance. It allows to set Configuration keys:

Kind: global variable
Returns: Object

Param	Type	Description
name	String	(required) name of Log
level	String	(optional) set the level for a single output stream
path	String	(optional) Specify the file path to which log records are written
src	Boolean	(optional) Defaults to false. Set true to enable 'src' automatic field with log call source info

middleware

use this method as middleware to log http requests.

Kind: global variable

Param
req
res
next

httpHeaderParser(string, begin, end) ⇒ string

Simple string parser

Kind: global function

Param
string
begin
end