Pino Lombok(ish)

Lombok(ish) wrapper which allows for simple pino logger creation as class member (or module variable) Also Implements NestJS interface.

Table of Contents

1. Installation
2. Usage
   • Init
   • Inside file
   • With Provided class name
   • As class member (Lombok'ish style)
3. HTTP Middleware
4. Level Changer
5. Marking Sensitive Logs
6. Default Configurations
7. Acknowledgments
8. License

Installation

npm i -s pino-lombokish
npm i -D @types/pino @types/pino-http pino-pretty

Note pino-pretty is disabled when NODE_ENV==='production'. If Users want to use pretty print in production then

• install pino-pretty as production dependency (npm i -s pino-pretty)
• override logger config during init or set NODE_ENV !== 'production'

Important! experimentalDecorators, emitDecoratorMetadata, strictPropertyInitialization compilation options must be enabled in your tsconfig.json file.

{
  "compilerOptions": {
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "strictPropertyInitialization": false
  }
}

Usage

Important! Execute "forRoot()" AT THE VERY BEGINNING OF YOUR APP (EVEN BEFORE OTHER IMPORTS)

// main.ts
import { LoggerFactory } from  'pino-lombokish';

LoggerFactory.forRoot({
  level:  'info', // trace | debug | info | warn | error | fatal
  name:  'YourAppName'  // optional
});

import { foo }

Inside ts/js file

// file.ts
import { LoggerFactory } from  'pino-lombokish';

const  logger = LoggerFactory.createLogger();
logger.info('Will log "className": "file.ts" in Your Log');

With Provided class name

// file.ts
import { LoggerFactory } from  'pino-lombokish';

const  logger = LoggerFactory.createLogger('foo');
logger.info('Will log "className": "foo" in Your Log');

As class member - Lombok(ish) style

// foo.ts
import { Logger, AppLogger } from  'pino-lombokish';

export  class  Foo {
  @Logger()
  private  logger: AppLogger;
  
  @Logger()
  private  anotherLogger: any;
  constructor() {
    this.logger.info('Will log "className": "Foo" in Your log');
    this.anotherLogger.info('Will log "className": "Foo" in Your log');
  }
}

HTTP Middleware.

Creates Pino Http NodeJS/express middleware

import { LoggerFactory } from  'pino-lombokish';
import { LoggerOptions } from  'pino';
const  config: LoggerOptions = {
  level:  'debug',
  name:  'YourApp'
};
LoggerFactory.forRoot(config);

// NOTE: Import other modules using Logger after calling LoggerFactory.forRoot()
import { Foo } from  './foo';
import  *  as  express  from  'express';
const  app = express();
app.use(LoggerFactory.createHttpLoggerMiddleware(config));
app.listen(3000);

Note HTTP Middleware class name is hard coded to 'http'

By Default HTTP Logger Logs any request containing "/health" as TRACE

(To Get rid of Kubernetes Health check logs)

By Default HTTP Logger will redact

1. HTTP Headers (via pino redact option)
   • Authorization
   • x-original-uri
   • x-original-url
   • sec-websocket-protocol
2. HTTP URL Parameters (via pino http serializers option)
   • access_token

HTTP Configuration can be overriden by user. Simply call function with own provided config

import { LoggerOptions } from  'pino';
import { Options } from  'pino-http';
const  pinoConfig: LoggerOptions = {
  level:  'warn',
}
const  pinoHttpOptions: Options: {
  customLogLevel: customLogLevelFn,
  serializers: { req: customReqSerializer }
}
app.use(LoggerFactory.createHttpLoggerMiddleware(pinoConfig, pinoHttpOptions));

Level Changer

pino-lombokish package implements Level Changer functionality which allows users to change logger level at runtime.

Configuration

main.ts

import { LoggerFactory, AppLogger, Logger } from  'pino-lombokish';
LoggerFactory.forRoot({
  level:  'debug',
  name:  'example',
  changeConfig: {
    path:  './levels.json'
  }
});

levels.json

{
  "level": "info", // mandatory
  "levels": {
    // optional if user wants to set level for specific class name
    "example.ts": "warn",
    "LevelChanger": "info",
    "http": "info"
  }
}

NOTE

• If provided file does not exist Level Changer will check for its existence every 10s.
• Once the file is created Level Changer will subscribe to its changes
• When the file is removed Level Changer will start checking for its existence every 10s (again)

Marking Sensitive Logs (optional)

pino-lombokish package implements sensitive logging bindings.

This feature is not meant to redact logs.

• It is meant for log forwarders in PaaS systems (i.e splunk-forwader or fluentd).
• Log forwarders send logs to aggregators (i.e kibana)
• Log forwarders can be configured to look for specific properties in logs
  • If property is present then send to specific aggregators only (i.e. aggregators which store sensitive logs only)
  • If property is not present then send to all aggregators

Default Configuration

LoggerFactory.forRoot({
  sensitive: true
})

const logger = LoggerFactory.createLogger('withDefaultSensitiveBindings');
logger.sensitive.info('Will add { isSensitive: true } to log')

User Provided Configuration

LoggerFactory.forRoot({
  sensitive: {
    sensitiveName: 'sensitiveLog',
    sensitiveValue: 'yes'
  }
})

const logger = LoggerFactory.createLogger('withUserSensitiveBindings');
logger.sensitive.info('Will add { sensitiveLog: "yes" } to log')

Default Configurations

Logger

export  const  DEFAULT_LOGGER_CONFIG: pino.LoggerOptions = {
  level:  'info',
  prettyPrint:  process.env.NODE_ENV !== 'production' ? 
                { translateTime:  true } 
                : false,
  customLevels: {
    log:  pino.levels.values['info'],
    verbose:  pino.levels.values['info']
  }
};

HTTP Middleware

export  const  DEFAULT_MIDDLEWARE_CONFIG: pino.LoggerOptions = {
  ...DEFAULT_LOGGER_CONFIG,
  redact: {
    paths: [
      'req.headers.authorization',
      'req.headers["x-original-uri"]',
      'req.headers["x-original-url"]',
      'req.headers["sec-websocket-protocol"]'
    ]
  }
};

const  options: pinoHttp.Options = {
  customLogLevel:  logHealthAsTrace,
  serializers: { req:  redactAccessTokenFromPath }
};

Sensitive Config

export const DEFAULT_SENSITIVE_CONFIG = {
  sensitiveName: 'isSensitive',
  sensitiveValue: true
};

Acknowledgements

• Pino Logger
• Project Lombok
• V8 Stack trace API
• Node Watch
• Reflect Metadata

License

The MIT License Copyright (C) 2019 Motorola Solutions, Inc All rights reserved