Upkar Lidder
Upkar Lidder is a Full Stack Developer and Data Wrangler with a decade of development experience in a variety of roles. He can be seen speaking at various conferences and participating in local tech groups and meetups.
Apache OpenWhisk
an open source, distributed Serverless platform
Upkar Lidder
Developer Advocate, IBM
> ulidder@us.ibm.com
> @lidderupk
> upkar.dev
@lidderupk
What is Serverless
Serverless computing refers to the concept of building and running applications that do not require server management.
It describes a finer-grained deployment model where applications, bundled as one or more functions, are uploaded to a platform and then executed, scaled, and billed in response to the exact demand needed at the moment.
It refers to the idea that consumers of serverless computing no longer need to spend time and resources on server provisioning, maintenance, updates, scaling, and capacity planning. Instead, all of these tasks and capabilities are handled by a serverless platform and are completely abstracted away from the developers.
Cloud Native Computing Foundation
https://github.com/cncf/wg-serverless/tree/master/whitepapers/serverless-overview
Use Cases
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Secure and scalable APIs
- API Gateway ➸ Function
- Backend services / micro services
- Event Driven Programming
- Changes in database
- Stream Processing
- Social events
@lidderupk
Short duration, focused, asynchronous
Infrequent or has sporadic demand
Stateless
Highly dynamic
Serverless Landscape
Hosted
Installable
Cloud Native Computing Foundation
@lidderupk
Apache OpenWhisk
Apache OpenWhisk is an open source, distributed Serverless platform that supports a programming model in which developers write functional logic (called Actions), in any supported programming language, that can be dynamically scheduled and run (with Rules) in response to associated events (via Triggers) from external sources ( Feeds) or from HTTP requests.
@lidderupk
Apache OpenWhisk
Packages
@lidderupk
Built on Open Source
@lidderupk
WSK CLI
@lidderupk
WSK SYSTEM PACKAGES
@lidderupk
WSK SYSTEM PACKAGES
@lidderupk
@lidderupk
Apache OpenWhisk (js)
Entry point
Object In
Object Out
Apache OpenWhisk (js)
@lidderupk
@lidderupk
Demo Goals
- Create secure and scalable REST API for CATS
[API Gateway ➸ Functions ➸ db]
GET /cat ➸ cat-get
POST /cat ➸ cat-post
PUT /cat ➸ cat-put
DELETE /cat ➸ cat-delete
@lidderupk
Demo Goals
@lidderupk
- Event Driven Programming
- Send an email when a crimson 😻 is added
- Use cloudant/couchdb feed to listen to document changes on name
- Use SendGrid to send an email when a crimson cat is added !
Apache
@lidderupk
- A document-oriented NoSQL database
- Trigger listens to _changes feed. We can use a filter function in a design document to only be notified on certain changes
Demo Goals
@lidderupk
@lidderupk
@lidderupk
What if there is a surge of cats from Australia ?
CAT-POST is scaled as needed !
@lidderupk
I want to refactor my code base to TypeScript !
Refactor one function/action at a time !
@lidderupk
I want to switch out my email service provider !
Plug and Play model. Only change send_email action !
@lidderupk
I want to onboard more clients to my API
Use API Gateway to set up sepearate keys or use your own authentication !
Composition / Orchestration
CONDITION Action Name
Code
THEN Action Name
Code
ELSE Action Name
Code
@lidderupk
Composition / Orchestration
@lidderupk
So much more ...
-
More Compositions - Use higher-level programming constructs to declaratively chain together multiple actions.
- while, repeat, let, retry, try, if, etc
- HTTP Actions (web == true)
- Packages community (couchdb, kafka, etc)
- API Gateway (rate limiting, authentication/authorization)
- Install external packages, debugging, etc
@lidderupk
KUI Shell
@lidderupk
KUI Shell
@lidderupk
Community
- Slack
- http://openwhisk-team.slack.com/
- Github source and OpenWhisk docs
- Youtube/Medium/Twitter
- OpenWhisk Tech Interchange
@lidderupk
Some things to 🤔
- Functions are stateless. Need some sort of persistence between runs.
- Are you able to test and develop locally ? Does provider have CLI ?
- Can you easily version your functions ? Source control ?
- Can you easily monitor your functions ?
- Security and API gateway
- Avoid long-running loops / mini-monoliths ?
- Latency (cold, warm and hot loads)
- How do you track dependencies ?
@lidderupk
Future of Serverless ?
@lidderupk
Thank you
> ulidder@us.ibm.com
> @lidderupk
> upkarlidder.com
@lidderupk
Upkar Lidder
Developer Advocate, IBM
Call for Code 2019
@lidderupk
OpenWhisk
@lidderupk
IBM Cloud Functions
@lidderupk
Compositions
@lidderupk
Solid Foundations
Leverages existing opensource solutions
@lidderupk
Apache OpenWhisk (js)
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@lidderupk
Apache OpenWhisk (py)
Entry point
Dictionary
Dictionary
@lidderupk
Apache OpenWhisk (py)
@lidderupk
Apache OpenWhisk (py)
@lidderupk
Composition / Orchestration
@lidderupk
Composition / Orchestration
@lidderupk
Apache OpenWhisk (js)
Entry point
Object In
Object Out
@lidderupk
Apache OpenWhisk (js)
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2
3
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5
@lidderupk
Composition / Orchestration
CONDITION Action Name
Code
THEN Action Name
Code
ELSE Action Name
Code
@lidderupk
Composition / Orchestration
@lidderupk
Apache OpenWhisk (java)
Entry point
JsonObject In
JsonObject Out
@lidderupk
Apache OpenWhisk (java)
JsonObject In
Fat JAR
@lidderupk
Apache OpenWhisk (java)
@lidderupk
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Apache OpenWhisk (java)
@lidderupk
Apache OpenWhisk (tail log)
@lidderupk
Apache OpenWhisk (create)
wsk action create helloJava target/hello-world-java.jar
--main com.example.FunctionApp
@lidderupk
Apache OpenWhisk (invoke)
wsk action invoke --result helloJava --param name "Upkar Lidder"
@lidderupk
Apache OpenWhisk (example)
@lidderupk
sfhtml5-serverless
By Upkar Lidder
