javascript appender

Create appender for log4js-node to enable RELP usage from node.js applications.

User Story: As a developer I would like to use jsa_01 to push log messages over relp to a compatible relp-server with syslog envelope

Specs

Requirements Backlog

#	Title	User Story	Importance	Status
1	Rebind	Rebind of the rlp_02 connection must be done after configureable amount of messages	OPTIONAL	Open
2	Syslog	Wrap messages in syslog envelope	Must Have	WIP
3	RELP	Use rlp_02 library	Must Have	Done
4	Lossless	Retry indefinitely and do not lose messages	Must Have	Open
5	Robust	Processing must not hang indefinitely due to techinical issues but rather retry new connection	Must Have	Open
6	Source Data	Must include origin data in syslog structure-data within source-metadata	Must Have	WIP
7	Originator	Must include hostname within new syslog structured-data (SD) so utilization systems can utilize it	Must Have	Done
8	app-name	Syslog app-name must be configureable	Must Have	Done
9	hostname	syslog hostname must be configureable	Must Have	Done
10	server port	Server ports need to be configureable	Must Have	Done
11	Server address	server address needs to be configureable	Must Have	Done
12	Expose error SyslogMessage	Erros(expecptions) must not be hidden	Must Have	Open
13	Extra libraries	Do not use extra libraries	Must Have	Open
14	Variable checking	Check variables provided via configuration to be valid and raise errors if not in initilization	Must Have	Done
15	Debug flags	Allow passing debulg flags via configuration	OPTIONAL	Open

High-level Architecture

Implementation

The jsAppender to push log messages over relp to a compatible relp-server with syslog envelope.

Use following components for:

• rlp_02: RELP connection

• rlo_08: Generate the Syslog message

• Java-relp-server-demo: RELP compatible server (tested on)

How to implement:

• asynchronus behaviour completely controlled by the Jasmine async works.

  npm install

• Module usage:

  The appender uses the rlo_08 for handling formatting log messages and rlp_02 to send the log event message to the RELP Server.

  const { SyslogMessage, Facility, SDElement, SDParam, Severity } = require('@teragrep/rlo_08')
  const { RelpConnection, RelpBatch } = require('@teragrep/rlp_02')

• Build

  mvn clean package

• Optional tips:

  async waterfall method also possible for run in the node engine (need to adjust the code).

Configuration

• type - jsAppender

• hostname - string (defaults to os.hostname()) - origin of the log messages

• appname - string

• serverAddress - string

• serverPort - integer (defaults to 1601) - Port of the relp server is listening in

Example (default config)

log4js.configure( {
    appenders: {jsa: { type: jsAppender, appName: 'teragrep' },
    console: { type: 'console' },
  },
  categories: {
    jsa: { appenders: ['jsa'], level: 'error' },
    default: { appenders: ['jsa'], level: 'trace' },
  },
})

This configuration will send the log event messages to the RELP Server.

Contributing

You can involve yourself with our project by opening an issue or submitting a pull request.

Contribution requirements:

1. All changes must be accompanied by a new or changed test. If you think testing is not required in your pull request, include a sufficient explanation as why you think so.

2. Security checks must pass

3. Pull requests must align with the principles and values of extreme programming.

4. Pull requests must follow the principles of Object Thinking and Elegant Objects (EO).

Read more in our Contributing Guideline.

Contributor License Agreement

Contributors must sign Teragrep Contributor License Agreement before a pull request is accepted to organization’s repositories.

You need to submit the CLA only once. After submitting the CLA you can contribute to all Teragrep’s repositories.