heroku-events

This module will mined heroku dyno related events out of a syslog file.

Get Started

To get started with this module you need to enable log sink on your heroku instance, this will send all the logs from your application to a syslog server, which will write this to a file.

To read the a syslog file and create a model representing the state of your application, while also consuming service related events.

var fs = require('fs')
var split = require('split')
var LogParser = require('heroku-events')
 
// model for dynos hosts
var model = {}
 
var logParser = new LogParser(model)
 
logParser
    .on('app-discovered', function(app){
        console.log('app-discovered', app)
    })
    .on('app-change', function(app){
        console.log('app-change', app)
    })
 
var st = fs.createReadStream('/var/log/heroku.log')
st.pipe(split()).pipe(logParser)
 

The events which are currently fired are:

• app-discovered - Fired when a new log sink identifier is detected indicating a new app was discovered.
• app-change - Fired when a heroku dyno state change is read.
• dyno-up - Fired when an up heroku dyno state change is read.
• dyno-down - Fired when a down heroku dyno state change is read.
• dyno-starting - Fired when a starting heroku dyno state change is read.
• dyno-crashed - Fired when a crashed heroku dyno state change is read.

Future Work

Need to:

• rewrite the two core parts to simplify and clean up how the parsing and events work.