Tiny go webapp for generating highcharts charts on the server for including in emails, PDFs, etc. Uses highcharts-convert.js. Link

The following are accepted as HTTP parameters:

• input A javascript object with the chart configuration (same as -infile)
• scale The zoomFactor of the page used to generate the chart
• width The exact pixel width of the chart
• constr The constructor name. Can be either Chart or StockChart (if Highstock is included)
• callback A javascript callback function to be executed on chart load
• type The file type to be returned. Can be one of png (default), jpg, pdf, or svg

There are a few environment variables that can be set to control how the webapp runs:

• HTTP_BASIC_USERNAME An HTTP Basic Auth username can be required (also requires a password)
• HTTP_BASIC_PASSWORD An HTTP Basic Auth password can be required (also requires a username)
• IP The IP address to listen on (defaults to 0.0.0.0)
• PORT The port to listen on for HTTP requests (defaults to 8080)
• KEEPALIVE_URL A URL to ping regularly to keep the app marked as active (useful for Heroku) This should be set to http://your site/ping

Requires go 1.0 (or higher) and phantomjs.

Clone the project

git clone git://github.com/vongrippen/go-highcharts-server.git

Install phantomjs

gem install brew
brew install phantomjs

Start up the server

go run main.go

Generate a chart using curl

HIGHCHART_OBJECT=`cat ./spec/fixtures/input.json`
curl -X POST -d "input=$HIGHCHART_OBJECT" http://localhost:8080/ -o ./chart.png

Or optionally with width:

curl -X POST -d "input=$HIGHCHART_OBJECT&width=900" http://localhost:8080/ -o ./chart.png

This project is made to deploy to heroku. It is using the heroku-buildingpack-multi depending including both phantomjs and go. Just create a new project within heroku and push it like you know how.

Using httparty:

require 'httparty'

chart_object_js = '{series: [{
    type: 'pie',
    name: 'Slices',
    data: [1,2,3,4,5]
  }]}'
response = HTTParty.post('http://localhost:8080/', body: {input: chart_object_js, width:550})
File.open('./chart.png', 'wb'){ |file| file << response.body }