Lager

Lager enables you to collect data, organize it, and programmatically flush it to a single endpoint. Logs are separated by type, each of which contains an array of entries. Logs can then be flushed by type or all at once.

Logs are sent as a POST request in the form

{
  payload: {
    'type': [log[, log]],
    'type_2': [log[, log]]
    ...
  }
}

where log is an object of key-value pairs.

Install

Node

npm install lagerjs --save

Browser
Include build/lager.js or build/lager.min.js in your HTML file. Alternatively, you can build lager yourself with make.

Usage

Lager.log(type, data[, flush])
Store log data and associate it with an type. Optionally set flush to true to send the data immediately. Flush is false by default.

Lager.flush([type])
Send all logs to the endpoint. Optionally give type, and only those logs will be sent.

Example

var Lager = require('lagerjs');
 
var logger = new Lager({
  host: 'yourserver.io/some-endpoint' // or whatever
});
 
logger.log('playstart', { name: 'wells' });
logger.log('playstart', { paused: true });
logger.log('playstart', { hd: false });
logger.log('playend', { seconds: 50 });

Will produce the following data in memory

{
  payload: {
    'playstart': [{ name: 'wells' }, {paused: true}, {hd: false}],
    'playend': [{ seconds: 50 }]
  }
}

Then send logs to a backend

logger.flush('playstart') // flush playstart logs only
logger.flush()            // alternatively flush everything