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The First RichCoin Bank of Santa Barbara

The First RichCoin Bank of Santa Barbara. CS290B – Spring 2014 Hiranya – Alex – Chris – Emre - Stratos. Roadmap. Introduction APIs Tutorial and demo AWS for RichCoin Questions. Introduction. Central storage for all the RichCoins you’re going to mine this quarter.

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The First RichCoin Bank of Santa Barbara

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  1. The First RichCoin Bank of Santa Barbara CS290B – Spring 2014 Hiranya – Alex – Chris – Emre - Stratos

  2. Roadmap • Introduction • APIs • Tutorial and demo • AWS for RichCoin • Questions

  3. Introduction • Central storage for all the RichCoins you’re going to mine this quarter. • Validates submitted coins for correctness and uniqueness. • Keeps score. • Accessible via a secure REST API.

  4. System Design Queue Web Server Coin Validator Database Client (You)

  5. API Features • Secured • OAuth 2.0 bearer token profile • Throttled (Rate Limited) • Gold, Silver and Bronze tiers • Separate production and sandbox environments • Versioned

  6. APIs • Vault API • Mint new coins • Retrieve already minted coins • Scoreboard API • Retrieve current score • Admin API • Only for admins

  7. Accessing the APIs: Step 1 • Send an e-mail to hiranya@cs.ucsb.edu • Specify following details: • Group name: avengers2014 • Group members: • Steve Rogers • Tony Stark • Bruce Banner • You will get a reply back with login credentials for the RichCoin API Store.

  8. Accessing the APIs: Step 2 • Change your password… • https://euca-128-111-179-147.eucalyptus.race.cs.ucsb.edu:9443/carbon • Login using the username and password sent in the email. • Click on “Configure” tab left to the main menu. • Select “Users and Roles”. • Click on “Change My Password”.

  9. Accessing the APIs: Step 3 • Register your applications… • https://euca-128-111-179-147.eucalyptus.race.cs.ucsb.edu:9443/store/ • Login using your username and password. • Select “My Applications”. • Enter a meaningful name for the application you’re going to implement using the APIs.

  10. Accessing the APIs: Step 4 • Subscribe to the APIs… • Click on each API, select the application you registered in the previous step, select a throttling tier and click “Subscribe”.

  11. Accessing the APIs: Step 5 • Obtain API keys… • Select “My Subscriptions”. • Make sure your application is selected in the dropdown. • Click “Generate Keys”. • You can generate separate keys for production and sandbox environments.

  12. Accessing the APIs: Step 6 • At this point you are all set. • Simply send your API key to the server along with all your requests. • API key should be sent as a HTTP Authorization header: • Authorization: Bearer <Your-API-Key>

  13. Production & Sandbox Setups • You can get separate keys to access the production and sandbox environments. • APIs and their URLs are identical in the two environments. • Use the sandbox environment to test your application. • For the contest we will only consider the score in the production environment. • Note: Sandbox environment is not backed up and your data may get lost.

  14. Throttling/Rate Limiting • The access tier you selected when subscribing to an API determines how many requests you can send to an API in a minute. • e.g. Gold tier: Allows 20 req/minute • Once you exceed your per-minute quota, you will start receiving errors (503 Service Unavailable).

  15. Vault API • Minting a new coin • POST a JSON payload to /vault/1.0.0 • solution: Your solution matrix encoded into a string of 1’s and 0’s (row-major form) • clientTimestamp: A UTC timestamp generated from the client machine (milliseconds since epoch) { “solution”: “100000011000100”, “clientTimestamp”: 123456 }

  16. Vault API: Response • When you submit a new solution, you will get a unique ID back in return. • Use this ID to query the status of your solution. • GET /vault/1.0.0/<Unique-ID> { “coinId” : “1ab3jshfshns”, “ status” : 0, …. }

  17. Scoreboard API • Retrieve the current score • Send a GET request /scoreboard/1.0.0 • You get a JSON payload back with all the users and the number of coins they have mined • Application details available in payload for each user • Scores are sorted in descending order

  18. API Quick Reference

  19. Coin Status Codes • Every RichCoin resource you obtain from the API has a “status” attribute. • You can get a coin status of “2” due to many reasons. The exact reason is sent as an error code in the “reason” field (see next slide).

  20. Error Codes • Last 2 are not your fault. Send us an e-mail if you ever see them.

  21. Common Errors/Mistakes • Calling APIs without subscribing or without the API key • Sending the API key in a wrong format • Must be sent in the Authorization header prefixed by the string “Bearer ” (there should be a space between “Bearer” and the API key) • Getting the production and sandbox keys mixed up

  22. Common Errors/Mistakes • Invalid clientTimestamp value in the request to mint coins • Must be a UTC timestamp (Milliseconds elapsed since Unix epoch) • Make sure your clock is synchronized against some well-known time service • Exceeding your throttling limit (per-minute, per-API quota)

  23. Known Issues • Location header on the response to /vault/1.0.0 is wrong. • We are working on getting a more static hostname for the service endpoint. • Until then some changes may occur • Do not hardcode the hostnames to your apps yet • API Console feature in API store doesn’t work. • If you see any other weirdness, let us know asap.

  24. Application Development Best Practices • Log all important events and API calls. • With timestamps • Keep local copies of the RichCoins mined. • Make a copy of the solution matrix before submitting to the bank • “In large distributed systems, component failures are the norm rather than the exception.” – GGL03

  25. Sample Client App • We implemented an interactive tool to invoke and test the APIs • Implemented in Python • Can use as an example on how to call the API programmatically • Simply add your API key to settings.yaml and fire away

  26. AWS for RichCoin CS290B – Spring 2014 Alex Pucher

  27. AWS for RichCoin • Single account per group • Only EC2 and S3 • Limited to USD 100.0 per group • Using spot instances recommended • You go over, you get nuked • You’ll get a warning (maybe) • Don’t store critical data on AWS

  28. AWS for RichCoin • You’ll receive: • Group account and password • AWS creds • EC2 Key pair • S3 bucket • Must use your key pair and assigned bucket • Else, access is blocked

  29. Disclaimers • Policy enforcement questionable • Message if something doesn’t work but should • Stuff may disappear • DO NOT store critical data on AWS • https://richcoin.signin.aws.amazon.com/

  30. Questions?

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