Socket
Socket
Sign inDemoInstall

gelf-pro

Package Overview
Dependencies
1
Maintainers
1
Versions
38
Alerts
File Explorer

Advanced tools

Install Socket

Detect and block malicious and high-risk dependencies

Install

gelf-pro

The Graylog Extended Log Format for the Node.js


Version published
Maintainers
1
Weekly downloads
14,146
decreased by-10.77%

Weekly downloads

Readme

Source

gelf pro

node-gelf - Graylog2 client library for Node.js. Pro - because of code-quality (at 2015). GELF - The Graylog Extended Log Format.

Build Status Coverage Status

Installation

"dependencies": {
  "gelf-pro": "~1.3" // see the "releases" section
}

npm install gelf-pro (ALL node.js versions are supported [0.x to 20.x] :)

Library depends on: lodash#~4.17

Initialization

var log = require('gelf-pro');

Adapters

:warning: To provide predictable behaviour, all existing adapters do NOT re-use the socket connection.
There are multiple (1, 2) variants available which you can borrow from (and create a new adapter).
See related section.

  • UDP (with deflation and chunking)
    • Input: GELF UDP
  • TCP
    • Input: GELF TCP (with Null frame delimiter)
  • TCP via TLS(SSL)
    • Input: GELF TCP (with Null frame delimiter and Enable TLS)

Withing more or less stable network (which is most likely) I would recommend using the "udp" adapter.
I would also recommend it for an average to high-loaded project.
For sensitive information tcp-tls adapter is recommended.

Configuration

// simple
log.setConfig({adapterOptions: {host: 'my.glog-server.net'}});

// advanced
log.setConfig({
  fields: {facility: "example", owner: "Tom (a cat)"}, // optional; default fields for all messages
  filter: [], // optional; filters to discard a message
  transform: [], // optional; transformers for a message
  broadcast: [], // optional; listeners of a message
  levels: {}, // optional; default: see the levels section below
  aliases: {}, // optional; default: see the aliases section below
  adapterName: 'udp', // optional; currently supported "udp", "tcp" and "tcp-tls"; default: udp
  adapterOptions: { // this object is passed to the adapter.connect() method
    // common
    host: '127.0.0.1', // optional; default: 127.0.0.1
    port: 12201, // optional; default: 12201
    // ... and so on
    
    // tcp adapter example
    family: 4, // tcp only; optional; version of IP stack; default: 4
    timeout: 1000, // tcp only; optional; default: 10000 (10 sec)
    
    // udp adapter example
    protocol: 'udp4', // udp only; optional; udp adapter: udp4, udp6; default: udp4
    
    // tcp-tls adapter example
    key: fs.readFileSync('client-key.pem'), // tcp-tls only; optional; only if using the client certificate authentication
    cert: fs.readFileSync('client-cert.pem'), // tcp-tls only; optional; only if using the client certificate authentication
    ca: [fs.readFileSync('server-cert.pem')] // tcp-tls only; optional; only for the self-signed certificate
  }
});

log.setConfig merges the data. Therefore, you can call it multiple times.

Basic functionality

var extra = {tom: 'cat', jerry: 'mouse', others: {spike: 1, tyke: 1}};

log.info("Hello world", extra, function (err, bytesSent) {});
log.info("Hello world", function (err, bytesSent) {});
log.info("Hello world", extra);
log.info("Hello world");

log.error('Oooops.', new Error('An error message'));
// ^-- extra becomes: {short_message: 'Oooops.', _error_message: 'An error message', _error_stack: Error's stack}

log.error(new Error('An error message'));
// ^-- extra becomes: {short_message: 'An error message', full_message: Error's stack}

log.message(new Error('An error message'), 3); // same as previous
Extra

In case extra is a plain object, the library converts it to a readable format. Other values are converted to string. The acceptable format of a key is: ^[\w-]$

log.info(
  'a new msg goes here',
  {me: {fname: 'k', lname: 'k', bdate: new Date(2000, 01, 01)}}
);
// ^-- extra becomes: {_me_fname: 'k', _me_lname: 'k', _me_bdate: 'Tue Feb 01 2000 00:00:00 GMT+0100 (CET)'}
Filtering

Sometimes we have to discard a message which is not suitable for the current environment. It is NOT possible to modify the data.

log.setConfig({
  filter: [
    function (message) { // rejects a "debug" message
      return (message.level < 7);
    }
  ]
});
Transforming

transforming happens after filtering. It is possible to modify the data.

log.setConfig({
  transform: [
    function (message) { // unwind an error
      if (_.isError(message.error)) {
        message.error = {message: message.error.message, stack: message.error.stack};
      }
      return message;
    }
  ]
});
Broadcasting

broadcasting happens after transforming. It is NOT possible to modify the data.

log.setConfig({
  broadcast: [
    function (message) { // broadcasting to console
      console[message.level > 3 ? 'log' : 'error'](message.short_message, message);
    }
  ]
});

Levels (1, 2, 3)

Default:
{emergency: 0, alert: 1, critical: 2, error: 3, warning: 4, notice: 5, info: 6, debug: 7}
Example: log.emergency(...), log.critical(...), etc.
Custom example: {alert: 0, notice: 1, ...}

Third party adapters

You can force using custom adapter by setting the adapter right after initialisation. The signature might be found here.

  var log = require('gelf-pro');
  var myFancyAdapter = require('...');
  log.adapter = myFancyAdapter;
  // (!) adapterName and adapterOptions will be ignored

Aliases

Default: {log: 'debug', warn: 'warning'}
Example: log.log(...) -> log.debug(...), log.warn(...) -> log.warning(...), etc.
Custom example: {red: 'alert', yellow: 'notice', ...}

Tests

Cli
npm install
npm test
Docker
[sudo] docker build --no-cache -t node-gelf-pro .
[sudo] docker run -ti --rm -v "${PWD}:/opt/app" -w "/opt/app" node-gelf-pro
Contributors
License

MIT

Keywords

FAQs

Last updated on 12 Jan 2024

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc