Notes to Aftership

---

• After git clone and cd, run npm install.
• Put the aftership.json file under config folder.
• Then run: NODE_ENV=aftership node index.js

The challenge

---

• DOWNLOAD this repository to your own Github public repository.
• Create a new repo, name it by using this shortGUID generator
• Do NOT fork, as other candidates would be able to see your solution easily.
• Use beanstalkd, mongodb, nodejs
• Get the xe.com exchange rate, store it in mongodb for every 1 min.

Goal

---

Code a currency exchagne rate worker

1. Input currency from USD, to HKD
2. Get USD to HKD currency every 1 min, save 10 successful result to mongodb.
3. If any problem during the get rate attempt, retry it delay with 3s
4. If failed more than 3 times, give up the job.

The worker should:

Scale horizontally (can run in more than 1 process in many different machines)

How it work?

---

1. Seed your job in beanstalkd, tube_name = your_github_username

Sample beanstalk payload for getting HKD to USD currency, you can use any format or content to fit your need.

{
  "from": "HKD",
  "to": "USD"
}

2. Code a nodejs worker, get the job from beanstalkd, get the data from xe.com and save it to mongodb. Exchange rate need to be round off to 2 decmicals in STRING type.

   a. If request fail, reput to the tube and delay with 3s.

   b. If request is done, reput to the tube and delay with 60s.

mongodb data:

{
	"from": "HKD",
	"to": "USD",
	"created_at": new Date(1347772624825),
	"rate": "0.13"
}

3. Stop the task if you tried 10 succeed attempt or 3 failed attempt.

4. NOTICE that the above bs payload is just an example, you should make sure your script can be run as distributed system (multiple instances, multi process), and also able to get MULTIPLE currenies if needed. Not only HKD to USD.

5. You are coding the consumer worker, NEVER use your worker to seed the data.

Tools you need

---

1. beanstalkd server is setup for you already, make a JSON request to this:

   /POST http://challenge.aftership.net:9578/v1/beanstalkd

   header: aftership-api-key: a6403a2b-af21-47c5-aab5-a2420d20bbec

2. Get a free mongodb server at mongolab

3. You should need fivebeans npm or any tools u like.

4. You may also need Beanstalk console or any tools u like.

5. Our cook book

Help?

---

am9ic0BhZnRlcnNoaXAuY29t