Ravelin Code Test

Usage

Build project:

$ go build

Run project:

$ ./code-test
2017/03/21 15:19:57 Listening on port 8080

The frontend will then be served on http://localhost:8080

Submission Remarks

General Notes

I tried to provide an 'overkill' solution in order to show off my implementation skills. Note that I am usually more pragmatic and less verbose in my code. In this submission I try to show that I am familiar with the following:

Web backend development practices
Go concurrency patterns
Unit testing
Continuous Integration

Other special remarks

Travis CI is set up for Go1.4, Go1.7 and JS environment with the following:

Vetting and Linting for Go and JS
Go unit testing
Go race condition test

A Middleware is created to conveniently intercept all incoming requests and is used for restricting HTTP methods and optional CORS. See middleware.go

Use environment variables to change PORT setting or enable CORS

$ RAV_PORT=5000 ./code-test
2017/03/21 15:19:46 Listening on port 5000

$ RAV_USE_CORS=true ./code-test
2017/03/21 15:19:57 Using CORS
2017/03/21 15:19:57 Listening on port 8080

A SessionManager is created that keeps track of sessions has a build-in background routine that removes sessions form memory which are older than 60 minutes. Otherwise, server would inevitably run out of memory. See sessionmanager.go.

Unit tests are created for the session manager as this part where it is the easiest to make mistakes. See sessionmanager_test.go.

Summary

We need an HTTP server that will accept any POST request (JSON) from muliple clients' websites. Each request forms part of a struct (for that particular visitor) that will be printed to the terminal when the struct is fully complete.

For the JS part of the test please feel free to use any libraries that may help you but please only use the Go standard library for the backend.

Frontend (JS)

Insert JavaScript into the index.html (supplied) that captures and posts data every time one of the below events happens; this means you will be posting multiple times per visitor. Assume only one resize occurs.

if the screen resizes, the before and after dimensions
copy & paste (for each field)
time taken from the 1st character typed to clicking the submit button

Example JSON Requests

{
  "eventType": "copyAndPaste",
  "websiteUrl": "https://ravelin.com",
  "sessionId": "123123-123123-123123123",
  "pasted": true,
  "formId": "inputCardNumber"
}

{
  "eventType": "timeTaken",
  "websiteUrl": "https://ravelin.com",
  "sessionId": "123123-123123-123123123",
  "time": 72, // seconds
}

...

Backend (Go)

The Backend must to:

Create a Server
Accept POST requests in JSON format similar to those specified above
Map the JSON requests to relevant sections of the data struct (specified below)
Print the struct for each stage of its construction
Also print the struct when it is complete (i.e. when the form submit button has been clicked)

Go Struct

type Data struct {
	WebsiteUrl         string
	SessionId          string
	ResizeFrom         Dimension
	ResizeTo           Dimension
	CopyAndPaste       map[string]bool // map[fieldId]true
	FormCompletionTime int // Seconds
}

type Dimension struct {
	Width  string
	Height string
}

loong/code-test