(Classic) Twilio Stock Checker Exercise

Objective

In this exercise you will learn how to develop KRL applications that interact with the Twilio telephony APIs.

Setup

1. Set up a twilio account
2. Have a cell phone handy to test SMS messages

Exercise

1. Create a global function called stockmessage that retrieves the price of an Facebook's stock (ticker: FB)
   1. Use the http:get() method to retrieve stock price from Yahoo's finance service.
   2. Hint: Your life will be easier if you only retrieve the stock price. Check the format option on the API call.
   3. Extract the stock price as a number from the request response.
   4. Compare that stock price with the number 38.
   5. Create a message based on the value related to 38.
      1. If lower, something like this: "Fail! Facebook's latest stock price of #{fbstock} dollars is still below it's IPO price!"
      2. if higher, something like this: "Awesome! Facebook's latest stock price of #{fbstock} dollars is above it's IPO price!"
   6. Return the message from the function.
2. Create a rule to display the message on any webpage with a notify. 
   1. We suggest using ktest.heroku.com/{appid} which will raise a pageview event to the appid you specify.
   2. Verify that your message looks correct, given the current value of facebook's stock.
3. Write a rule that responds to a twilio callstart event.
   1. Call the stockmessage function and store it in a variable in the pre block.
   2. Use the twilio:say() call to say the message.
   3. Use the twilio:hangup() call to end the call.
   4. Hint: When using more then one action, enclose them in curly braces {}
4. Write a rule that responds to twilio sms events.
   1. Call the stockmessage function and store it in a variable in the pre block.
   2. Use the twilio:sms() call to send a reply sms with the message.
5. Configure Twilio
   1. In your Twilio account, Create a new app called StockChecker.
   2. Use http://webhooks.kynetxapps.net/t/{appid}.dev/callstart for the voice request URL.
   3. Use http://webhooks.kynetxapps.net/t/{appid}.dev/sms for the sms request URL.
   4. Set up a new number, and select StockChecker as the app for both Voice and SMS.
   5. Test, Share and Enjoy!