Serverless Ballerina
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The document discusses serverless computing using Ballerina with Apache OpenWhisk and Kubeless, highlighting the concept of serverless architecture as a means to deploy and operate functions without managing servers. It provides examples of code in Ballerina, illustrating how to create and deploy serverless functions, integrate them with APIs, and manage them efficiently in a cloud-native environment. Additionally, it emphasizes the benefits of serverless computing, including cost efficiency through resource allocation and auto-scaling functionality.
![What about this Server part?
import ballerina/http;
endpoint http:Listener listener { port: 8080 };
@http:ServiceConfig { basePath: "/" }
service default bind listener {
@http:ResourceConfig { methods:["GET"], path: "/hello" }
hello(endpoint caller, http:Request req) {
var params = req.getQueryParams();
json body = params.hasKey("name") ? { name: params.name } : {};
http:Response res = new;
res.setPayload(msg(body));
_ = caller->respond(res);
}
}](https://image.slidesharecdn.com/serverlessballerina-180731065824/85/Serverless-Ballerina-24-320.jpg)
Serverless Ballerina
- 1. Serverless Ballerina Rodric Rabbah Apache OpenWhisk @rabbah Adnan Abdulhussein Kubeless @prydonius
- 2. Agenda ○ Serverless Computing ○ Serverless Ballerina with Apache OpenWhisk ○ Serverless Ballerina with Kubeless
- 3. To understand Server-less, let us review Server-full. What is Serverless Computing?
- 4. Server-full Computing ○ API or REST endpoint, e.g., “/hello” ○ Request/Response handler or function... … to accept input, return output
- 5. The Function public function msg(json data) returns json { json? name = data.name; if (name == null) { return { msg: "hello world!" }; } else { return { msg: "hello " + name.toString() + "!" }; } } input output { } → { msg: “hello world!” } { name: “san francisco” } → { msg: “hello san francisco!” } hello-function.bal
- 6. The Server hello-server.bal import ballerina/http; endpoint http:Listener listener { port: 8080 }; service default bind listener { hello(endpoint caller, http:Request req) { var params = req.getQueryParams(); json body = params.hasKey("name") ? { name: params.name } : {}; http:Response res = new; res.setPayload(msg(body)); _ = caller->respond(res); } }
- 7. Run the Server > ballerina run hello-server.bal ballerina: initiating service(s) in 'hello.bal' ballerina: started HTTP/WS endpoint 0.0.0.0:8080 localhost:8080/default/hello localhost:8080/default/hello?name=san francisco
- 8. Deploy the Server VM rent bare metal rent virtual machine rent a container
- 9. Deploy the Server VM rent bare metal rent virtual machine rent a container Manage servers. Operate servers. Secure servers. Scale servers. Pay for servers... … Even when idle.
- 10. So what is Serverless Computing? VM Function with serverless, there is the function, and only the function, for you to create, deploy and operate.
- 11. Serverless Ballerina in Apache OpenWhisk
- 12. 3337 stars, 631 forks 120 contributors Serverless Functions with Partners: Adobe, IBM, Red Hat Many on-prem deployments Use as hosted service from IBM, Adobe And now available from WSO2 Deploys to Kube, Mesos, OpenShift, VMs Run full stack on your laptop Topped Hacker News in February 912 on Slack https://openwhisk.apache.org
- 13. Reminder: The Function public function msg(json data) returns json { json? name = data.name; if (name == null) { return { msg: "hello world!" }; } else { return { msg: "hello " + name.toString() + "!" }; } } hello-function.bal
- 14. Deploy the Function > wsk action create hello hello-function.bal --web true ok: created action hello guest.localhost/default/hello.json guest.localhost/default/hello.json?name=san francisco
- 15. Under the hood “Deploy my code hello-function.bal as a function named hello” hello = hello-function.bal Function is deployed. Nothing is running. Your cost is $0. Controller Code Store Executor
- 16. Under the hood “Run my function hello and return the result” Controller Code Store Executor Function starts to execute within milliseconds. You pay for the duration of the function. Functions auto-scale with load. GET /hello
- 17. Functions run in containers. Apache OpenWhisk running locally on Mac OS
- 18. Some executions are “cold starts”. OpenWhisk hides container startup latency. Apache OpenWhisk running locally on Mac OS 58 ms: container assigned
- 19. Once a function is loaded, it is ready to execute. Apache OpenWhisk running locally on Mac OS 499 ms: function loaded
- 20. Apache OpenWhisk running locally on Mac OS warm starts OpenWhisk schedules functions to containers, and maximize “warm starts”.
- 21. Another example: using Ballerina central packages import wso2/twitter; public function run(json args) returns json { endpoint twitter:Client tw { clientId: args.clientId, clientSecret: args.clientSecret, accessToken: args.accessToken, accessTokenSecret: args.accessTokenSecret, clientConfig: {} }; twitter:Status st = check tw->tweet(args.data); return { status: st.text }; }
- 22. OpenWhisk Functions are Reactive
- 23. Serverless use cases Periodic and scheduled events run function when ... Integrated with event sources crop images, analyze content, transform data, conversation bots Batch processing integrate with data and object stores
- 24. What about this Server part? import ballerina/http; endpoint http:Listener listener { port: 8080 }; @http:ServiceConfig { basePath: "/" } service default bind listener { @http:ResourceConfig { methods:["GET"], path: "/hello" } hello(endpoint caller, http:Request req) { var params = req.getQueryParams(); json body = params.hasKey("name") ? { name: params.name } : {}; http:Response res = new; res.setPayload(msg(body)); _ = caller->respond(res); } }
- 25. Ballerina’s cloud-native edge ● Integrated application architecture ○ The “server” maps routes to functions ○ Generate Swagger → Configure API Gateway
- 26. Ballerina’s cloud-native edge ● Integrated application architecture ○ The “server” maps routes to functions ○ Generate Swagger → Configure API Gateway ● Functions as APIs and APIs as Functions ○ Single semantic-domain ● Integrate Functions in any language
- 27. Ballerina’s cloud-native edge ● Integrated application architecture ○ The “server” maps routes to functions ○ Generate Swagger → Configure API Gateway ● Functions as APIs and APIs as Functions ○ Single semantic-domain ● Integrate Functions in any language ● Leverage Ballerina’s built-in network type-system, error handling
- 30. Why Kubernetes? ○ Production-grade orchestration system ○ Infrastructure as code ○ Suited for microservice architectures ○ Easily extendable to build abstractions/APIs on to
- 31. Deploy a function $ kubeless function deploy hello --runtime ballerina0.980.0 --handler hello.foo --from-file helloget.bal import kubeless/kubeless; public function foo( kubeless:Event event, kubeless:Context context) returns (string|error) { return "Hello World Ballerina"; }
- 32. Under the hood Function Custom Resource Service (for HTTP triggers) ConfigMap Deployment kubeless client or kubectl Code Code
- 33. Q & A
- 34. THANK YOU