logger

This package provides the logging configuration typically used in Safe Security.

Motivation

Currently in Safe Security, all the services that require logging functionality imported a library & configured it as per the service needs.
Although this seems _okay_ initially, it becomes a challenge to do this across multiple services as care needs to be taken to keep the
dependency versions consistent across, code reusability takes a back seat since the configuration is duplicated everywhere, and is prone to human errors.

In order to solve this problem, the winston library used currently has been encapsulated in this package along with the desired defaults set up so that
the client does not have to worry about setting up a verbose configuration in multiple files.

Installation

``bash
npm install logger-safe-security
`

`bash
yarn add logger-safe-security
`

Usage

The introduction of this package makes it very easy for clients to consume & leverage the logging capabilities.

In Javascript:
`js
const { createLogger } = require("logger-safe-security");
const logger = createLogger({ logLevel: "info" });
logger.info("Hello world!");
`

In Typescript:
`js
import { createLogger } from "logger-safe-security";
const logger = createLogger({ logLevel: "info" });
logger.info("Hello world!");
`

Additionally, one can pass service metadata while importing it within the context of a service. For example:
`js
const { createLogger } = require("logger-safe-security");
const logger = createLogger({ service: "sample" });
logger.info("This log line will include service metadata");
`

Definition


The logger exported as part of this package contains the following definition:
- Log format:
- The default log format is set to JSON. Hence, all the log messages will be represented (printed) as JSON objects.
- Timestamp will be added to all log lines in yyyy-MM-dd'T'HH:mm:ss.SSSZ format.
- Application errors will be captured in the logs.
- String interpolation is supported.
- Log level:
- The default log level is INFO.
- Transports:
- All logs will be written to Console by default.
- Exceptions & Promise Rejections will be handled & written to Console as well.
- Metadata:
- { "type" : "application" } is added as default metadata to easily identify application logs. This can further be extended to differentiate
from audit logs and add parsing/filtering rules (for e.g. in Datadog) as needed.
- Additionally, all other metadata passed to the log messages will be stored under metadata` property for easy identification & grouping.