OpenWhisk JavaOne
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This document discusses serverless computing using OpenWhisk and provides an example IoT solution. It begins with an introduction to OpenWhisk and serverless computing. Next, it discusses some usage patterns for serverless applications and considerations when designing functions. It then provides steps to get started with OpenWhisk, including using the command line interface to create triggers, actions and rules. Finally, it demonstrates an IoT solution integrating a Raspberry Pi tank with sensors with OpenWhisk functions for image analysis and data processing.
OpenWhisk JavaOne
- 1. 1IBM _ Be Whisked Away with a Raspberry PI, Java, and OpenWhisk Luc Desrosiers IBM Certified IT Architect Session CON2758
- 2. 2IBM _ About me • 20 years in IT – Development, Integration, Cloud • IT Architect who loves to write code • Java enthusiast since using Servlet Express back in 1998 • Cloud, IoT and Cognitive computing are areas that I am passionate about • Probably lost my hair to a program that would not compile…
- 3. 3IBM _ What can you expect to get from this session? • An understanding of serverless computing and OpenWhisk • An early view on some usage patterns and how it can be used to complement your application design • A quick way to get started experimenting with OpenWhisk And finally, • A demonstration of an IoT solution integrated with OpenWhisk
- 4. 4IBM _ What is OpenWhisk? OpenWhisk is a Cloud platform to execute code in response to events • OpenWhisk is an Open Source project released by IBM • Supports many language including Java • Based on the serverless concept …
- 5. 5IBM _ What is serverless ? OpenWhisk is a Cloud platform to execute code in response to events • Serverless is about removing infrastructure from the equation • It is about focusing on business logics, not thread pools • Often associated to Function-as-a-Service
- 6. The transition from micro services… Microservice MicroserviceMicroservice Microservice Subscribe REST /HTTP Microservice Microservice broker API Microservice Publish API REST /HTTP Publish Service Discovery Microservice 1 Docker Container App Servers NodeJS instance App Servers NodeJS instance NodeJS instance VM What if I need to scale this? VM NodeJS instance NodeJS instance App Servers App Servers 1 Docker Container VM
- 7. serverless container to serverless… Microservice Microservice Microservice Microservice Subscribe REST /HTTP Microservice broker API Action Publish API REST /HTTP Publish Service Discovery Microservice Trigger Trigger What if I need to scale this? Serverless technology handles the burst Action 1 Docker Container 1 Docker Container VM VM VM
- 8. 8IBM _ So what does it look like ? Event Trigger Action
- 9. OpenWhisk Overview Language supported: • NodeJS • Swift • Java • Python • Docker
- 10. 10IBM _ Where does it fit ? • Serverless is a piece of the puzzle… not a complete solution • Triggers and Back-end Services are not necessarily serverless • Someone has to hold the state after all… UI Components Serverless components Event Generator Back-end as a Service
- 11. 11IBM _ Serverless and the 12 Factor App? Twelve Factor App was created as a methodology for building SaaS… II. Dependencies Explicitly declare and isolate dependencies III. Config Store config in the environment IV. Backing services Treat backing services as attached resources VI. Processes Execute the app as one or more stateless processes https://12factor.net/ VII. Port binding Export services via port binding VIII. Concurrency Scale out via the process model IX. Disposability Maximize robustness with fast startup and graceful shutdown
- 12. 12IBM _ OK, what about usage patterns ? • Serverless technologies are still new… patterns have yet to emerge • Simplicity should be the focus of each function • May need significant refactoring of existing code to minimize dependencies… However there are some architecture patterns where serveless fits nicely…
- 13. Mobile and Web Backend as a Service APIGateway Sequence Business Logic Action /whisk/websock et Backend Service Action Trigger Web App Benefits: • Clear delineation of business and controller logic • Produces discreet reusable action that can be assembled as a sequence /whisk/push
- 14. The analytics platform Cloudant DB A Data processing pipeline IoT Events Change Feed Change Listener Cloudant DB A Quality Control Event Persister /whisk/clou dant Data Enrichment /whisk/wea ther Benefits: • Database change can trigger other actions • Functionality can be extended easily Trigger
- 15. The DevOps pipeline Sequence Git Data Feed GitHub Benefits: • Improve communication • Clean extension to the build pipeline Business Logic Action /whisk/slack Backend Service Action
- 16. 16IBM _ Some considerations • Avoid heavy-weight functions • Harder to debug • Harder to reuse • Trigger do not guarantee order of processing… • Message affinity is bad… avoid it at all costs • Plan how your input and output are designed to maximize reuse • Ability to re-use an action depends on the assumption it is making about its input • Assert aggressively!
- 17. 17IBM _ Now, how can you get started? 1. Get familiar with the OpenWhisk command line interface 2. Create a basic Java Action 3. Deploy to Bluemix or locally
- 18. OpenWhisk Command Line wsk trigger create <trigger-name> 1. Creating a trigger wsk package create <package-name> 2. Creating a package wsk action create <package>/<action> <Jar File>.jar 3. Creating an action wsk package bind /whisk.system/websocket <bind-name> -p uri ws://<url> 4. Create a binding for an action wsk rule create <rule-name> <trigger> <action> 5. Create a rule for triggering an action Installing OpenWhisk CLI can be found here: https://new-console.ng.bluemix.net/openwhisk/cli
- 19. Creating a Basic Java Action The entry point for the Action must follow this signature Note: If the JAR file has more than one class with a main method matching required signature, the CLI tool uses the first one reported by jar -tf
- 21. 21IBM _ What is available out of the box? Here are some of the provided package of actions and feed you can use to get started: Cloudant Alarms Watson github Push Notifications slack Weather data
- 22. 22IBM _ Where does the Raspberry Pi come in? • Serverless technology Is based on triggering action based on events • A robot including sensors generates lots of events • Objective was to see how serverless could be integrated
- 23. The Anatomy of an IoT tank Cloudant IoT-Tank Stop Session Start Session Save IoT data Change Listener Image Analysis IoTBridge Visual Recognition Watson IoT Foundation IoTTankVision OpenWhisk Send image & sensor data Start & stop session
- 24. IoT tank – Communication Layer Pi4J – GPIO Control IBM Watson IoT Foundation – IoT integration Cloudant – Image persistence JRPiCam – Pi Camera Control Sending events: Receiving commands:
- 25. 25IBM _ Wrap-up • Serverless technology is a key part of a microservices architecture • OpenWhisk reduces the operational burden • Patterns are still emerging but the technology works great with: • Web or Mobile application • Analytics • DevOps pipeline • Getting started is easy and quick… Try it for yourself!
- 26. 26IBM _ Thank You! Some references… IBM Hybrid Cloud solution guide: Building a Hybrid Cloud with Bluemix Bluemix blog Getting Started with OpenWhisk: https://github.com/openwhisk/openwhisk https://new-console.ng.bluemix.net/openwhisk/cli https://console.ng.bluemix.net/docs/openwhisk/index.html?pos=2 Accessing the code: https://github.com/ldesrosi/iot-tank-client https://github.com/ldesrosi/iot-tank-server Luc Desrosiers | [email protected] | Twitter: Luc_At_IBM