Adventures in Apache OpenWhisk
A presentation at Serverless Days Cardiff in in Cardiff, UK by Rob Allen
Adventures in Apache OpenWhisk Rob Allen January 2019 Slides: https://akrabat.com/5507
Apache OpenWhisk Rob Allen ~ @akrabat
Apache OpenWhisk • • • • OpenSource http://openwhisk.org Incubator project working towards graduation Many contributors from multiple companies Rob Allen ~ @akrabat
Apache OpenWhisk • Self-hosted. Deploy to: - Kubernetes - Mesos - OpenShift - Dev: Vagrant & Docker Compose • Multiple public providers: - IBM - RedHat - Adobe (for Adobe Cloud Platform APIs) Rob Allen ~ @akrabat
Supported languages • • • • • .NET Core Go NodeJS Python Swift • • • • Ballerina Java PHP Ruby Also, your own Docker container can be deployed & invoked Rob Allen ~ @akrabat
Concepts Rob Allen ~ @akrabat
Event providers (feeds) • • • • • • Alarms (scheduled tasks) CouchDB GitHub Kafka Push notifications RSS Rob Allen ~ @akrabat
Getting started with OpenWhisk Rob Allen ~ @akrabat
Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat
Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat
Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat
Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat
Hello World def main(args): name = args.get(“name”, “World”) message = ‘Hello {}!’.format(name) return {‘body’: message} Rob Allen ~ @akrabat
Deploy to OpenWhisk $ zip -q hello.zip hello.py Rob Allen ~ @akrabat
Deploy to OpenWhisk $ zip -q hello.zip hello.py $ wsk action update —kind python:3.7 hello hello.zip ok: updated action hello Rob Allen ~ @akrabat
Run it $ wsk action invoke hello —result —param name Rob Rob Allen ~ @akrabat
Deploying your action $ wsk action invoke hello —result —param name Rob { “body”: “Hello Rob!” } Rob Allen ~ @akrabat
Segue: How did it do this?! Rob Allen ~ @akrabat
OpenWhisk’s architecture Rob Allen ~ @akrabat
Create an action Rob Allen ~ @akrabat
Invoke an action Rob Allen ~ @akrabat
Action container lifecycle • Hosts the user-written code • Controlled via two end points: /init & /run Rob Allen ~ @akrabat
Action container lifecycle • Hosts the user-written code • Controlled via two end points: /init & /run Rob Allen ~ @akrabat
End Segue Rob Allen ~ @akrabat
Web-enabled actions Access your action via HTTP: Perfect for web hooks Add the —web flag: $ wsk action update —kind python:3.7 —web true \ demo/hello hello.zip Rob Allen ~ @akrabat
Web-enabled actions Get URL and curl it: $ wsk action get —url demo/hello ok: got action hello https://192.168.1.17/api/v1/web/guest/demo/hello $ curl https://192…17/api/v1/web/guest/demo/hello?name=Rob { “body”: “Hello World!” } Rob Allen ~ @akrabat
API Gateway When you want to do more with HTTP endpoints • • • • • Route endpoint methods to actions (Open API Spec support) Custom domains Rate limiting Security (API keys, OAuth, CORS) Analytics Rob Allen ~ @akrabat
API Gateway Rob Allen ~ @akrabat
API Gateway $ wsk api create /myapp /hello GET hello Rob Allen ~ @akrabat
API Gateway $ wsk api create /myapp /hello GET hello ok: created API /myapp/hello GET for action /_/hello Rob Allen ~ @akrabat
API Gateway $ curl https://example.com/myapp/hello?name=Rob Rob Allen ~ @akrabat
API Gateway $ curl https://example.com/myapp/hello?name=Rob { “message”: “Hello Rob!” } Rob Allen ~ @akrabat
Packages • Group actions together • Set parameters used by all actions $ wsk package update demo $ wsk action update —kind python:3.7 demo/hello hello.zip Rob Allen ~ @akrabat
Built-in packages • • • • • • alarms github kafka pushnotifications utils weather • • • • • • cloudant jira pushnotifications slack watson websocket • & any other publicly shared package Rob Allen ~ @akrabat
Sequences Invoke a set of actions in turn Rob Allen ~ @akrabat
Composer: Logic for your actions Rob Allen ~ @akrabat
Composer: Logic for your actions Rob Allen ~ @akrabat
Composer: It’s just code composer.sequence( composer.if( ‘binday/authenticate’, composer.sequence( ‘format_input_from_alexa’, composer.if( ‘binday/validate’, ‘binday/get_next_bin_day’ ‘binday/send_failure’ ), ), ‘binday/send_failure’ ), ‘binday/format_output_for_alexa’ ) Rob Allen ~ @akrabat
Deployment: Serverless Framework Set up: $ $ $ $ npm install —global serverless serverless-openwhisk serverless create —template openwhisk-php —path app cd app npm install Rob Allen ~ @akrabat
serverless.yml service: ow-todo-backend provider: name: openwhisk runtime: php plugins: - serverless-openwhisk Rob Allen ~ @akrabat
serverless.yml functions: list-todos: handler: “src/actions/listTodos.main” name: “todo-backend/list-todos” events: - http: path: /todos method: get add-todo: handler: src/actions/addTodo.main # etc Rob Allen ~ @akrabat
Deploy $ serverless deploy Serverless: Packaging Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Compiling Serverless: Deploying Serverless: Deploying Serverless: Deploying […] service… Functions… Packages… API Gateway definitions… Rules… Triggers & Feeds… Service Bindings… Packages… Functions… API Gateway definitions… Rob Allen ~ @akrabat
Resources • http://www.openwhisk.org • https://github.com/apache/incubator-openwhisk-workshop • https://serverless.com/framework/docs/providers/openwhisk Developing Serverless Applications by Raymond Camden Free via https://akrab.at/openwhiskbook Rob Allen ~ @akrabat
Thank you! Rob Allen ~ @akrabat
Apache OpenWhisk is an Open Source serverless platform suited to a wide range of applications from IoT & chatbots through to microservices and web hooks. In this session, I’ll introduce OpenWhisk and show you how it works.
We’ll look at it’s key architectural concepts including actions, triggers, rules and packages which will show you how a serverless function integrates into a wide application. I’ll also look at the API Gateway functionality that makes building APIs that much easier. This session is recommended for tech leads and developers of all levels wanting to know about serverless and the OpenWhisk project.
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