Building microservices with Kotlin and gRPC Marharyta Nedzelska - - PowerPoint PPT Presentation

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Building microservices with Kotlin and gRPC Marharyta Nedzelska - - PowerPoint PPT Presentation

Jul 11, 2023 548 likes •1.67k views

Building microservices with Kotlin and gRPC Marharyta Nedzelska @jMargaritaN Copenhagen Denmark Building microservices with Kotlin and gRPC Who am I? Marharyta Nedzelska Software Engineer @ Wix KKUG & KNight Kyiv, Devoxx

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Copenhagen Denmark

Building microservices with Kotlin and gRPC Marharyta Nedzelska

@jMargaritaN

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Who am I?

Building microservices with Kotlin and gRPC

Marharyta Nedzelska

  • Software Engineer @ Wix
  • KKUG & KNight Kyiv, Devoxx UA
  • https://medium.com/@margoqueen95
  • @jMargaritaN twitter

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One more thing you should know

Building microservices with Kotlin and gRPC

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I like boxing! So think twice before asking tricky questions!

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AGENDA

Let’s talk about gRPC Implement Service gRPC and coroutines gRPC Kotlin libs

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The very beginning...

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Who writes microservices today, please, raise your hands?

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Microservices Rock!

▪ Independent ▪ Scalable ▪ Best suitable tool ▪ Parallel development ▪ etc...

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The biggest issue in changing a monolith into microservices lies in changing the communication pattern.

Btw, who said this?

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The biggest issue in changing a monolith into microservices lies in changing the communication pattern.

Btw, who said this?

Martin Fowler

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Who uses HTTP 1.1 and REST today, please, raise your hands?

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Clients Servers

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Let’s discover gRPC

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What does ‘gRPC’ stand for?

Riddle

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Building microservices with Kotlin and gRPC

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“gRPC” means gRPC Remote Procedure Call

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That’s ‘g’. What the hell is ‘RPC’?

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Building microservices with Kotlin and gRPC

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In distributed computing, a remote procedure call (RPC) is when a computer program causes a procedure to execute in a different address space, which is coded as if it was a normal (local) procedure call.

https://en.wikipedia.org/wiki/Remote_procedure_call

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Building microservices with Kotlin and gRPC

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gRPC Features

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Building microservices with Kotlin and gRPC

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gRPC Features

▪ Use HTTP/2 20

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1991

HTTP 0.9

HTTP protocol evolution

1996

HTTP 1.0

1997

HTTP 1.1

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Building microservices with Kotlin and gRPC

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HTTP protocol evolution

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No progress here

2000 1999 1998 22

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HTTP protocol evolution

And here

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HTTP protocol evolution

And still no progress...

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HTTP protocol evolution

Are they alive?

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HTTP protocol evolution

I guess no...

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HTTP protocol evolution

And suddenly!

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HTTP protocol evolution

2015

HTTP/2

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Building microservices with Kotlin and gRPC

I am alive!

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gRPC Features

▪ Use HTTP/2

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Single TCP connection

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gRPC Features

▪ Use HTTP/2

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Single TCP connection

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Bidirectional streaming

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Building microservices with Kotlin and gRPC

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gRPC Features

▪ Use HTTP/2

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Single TCP connection

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Bidirectional streaming

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Flow control

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Building microservices with Kotlin and gRPC

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gRPC Features

▪ Use HTTP/2

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Single TCP connection

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Bidirectional streaming

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Flow control

▪ Supports multiple languages

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gRPC Features

▪ Use HTTP/2

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Single TCP connection

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Bidirectional streaming

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Flow control

▪ Supports multiple languages ▪ Binary, uses protobuf

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+ ScalaPB

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?

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gRPC Discovered!

▪ Use HTTP/2

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Single TCP connection

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Bidirectional streaming

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Flow control

▪ Supports multiple languages ▪ Binary, uses protobuf

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Protocol Buffers

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Protocol buffers are Google’s language-neutral, platform-neutral, extensible mechanism for serializing structured data — think XML, but smaller, faster, and simpler.

https://developers.google.com/protocol-buffers/

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Sample .proto file

Building microservices with Kotlin and gRPC

syntax = "proto3"; package helloworld; service Greeter { rpc SayHello (HelloRequest) returns (HelloReply) {} } message HelloRequest { string name = 1; } message HelloReply { string message = 1; }

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compiling...

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Protobuf summary

▪ Type Safety

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Protobuf summary

▪ Type Safety ▪ No schema violations

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Protobuf summary

▪ Type Safety ▪ No schema violations

▪ Fast serialization/deserialization

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Protobuf summary

▪ Type Safety ▪ No schema violations

▪ Fast serialization/deserialization ▪ Backward compatibility

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Protobuf summary

▪ Type Safety ▪ No schema violations

▪ Fast serialization/deserialization ▪ Backward compatibility ▪ Human readability

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Implement Service

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We’re building a Death Star!

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Task for this session

▪ Write a “Death Star” ▪ Destroy as much planets as you can ▪ Tweet with #kotlinconf #gRPC and #Kotlin tags ▪ Greet winners at the end of our session! ▪ Enjoy!

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Application is here!

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http://104.198.212.208:8080

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Building microservices with Kotlin and gRPC

When user joins ...

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l

  • g

s

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Building microservices with Kotlin and gRPC

When user destroys planet ...

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Let’s implement!

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First look at proto

syntax = "proto3";

  • ption java_package = "ua.nedz.grpc";
  • ption java_outer_classname = "DeathStarProto";
  • ption objc_class_prefix = "DSP";

package deathstar; import "planet.proto"; service DeathStarService { rpc Destroy (stream DestroyPlanetRequest) returns (stream Planets) {} }

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First look at proto

message Planet { int64 planetId = 1; string name = 2; int64 weight = 3; int32 img = 4; } message Planets { repeated Planet planets = 1; } message DestroyPlanetRequest { string userName = 1; int64 planetId = 2; int64 weight = 3; }

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And we have generated

@javax.annotation.Generated( value = "by gRPC proto compiler (version 1.16.1)", comments = "Source: death-star.proto") public final class DeathStarServiceGrpc {...} public final class DeathStarProto {...} public final class PlanetProto {...} ...

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Server is

class DeathStarServer (private val port: Int = 50051, private val serverBuilder: ServerBuilder<*> = ServerBuilder.forPort(port)) { private lateinit var server: Server fun start() { server = serverBuilder .addService(DeathStarServiceImpl()) .build() .start() println("Server started!") } }

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Building microservices with Kotlin and gRPC

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Building microservices with Kotlin and gRPC

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gRPC and coroutines

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The whole destroy method...

  • verride fun destroy(responseObserver: StreamObserver<Planets>): StreamObserver<DestroyPlanetRequest> {
listeners.add(responseObserver) planetStub.getAllPlanets(Empty.getDefaultInstance(),
  • bject : StreamObserver<Planets> by DefaultStreamObserver() {
  • verride fun onNext(planets: Planets) {
responseObserver.onNext(populateWithCoordinnates(planets)) } }) return object : StreamObserver<DestroyPlanetRequest> by DefaultStreamObserver() {
  • verride fun onNext(destroyPlanetRequest: DestroyPlanetRequest) {
planetStub.removePlanet(RemovePlanetRequest { planetId = destroyPlanetRequest.planetId },
  • bject : StreamObserver<PlanetServiceProto.RemovePlanetResponse> by DefaultStreamObserver() {
  • verride fun onNext(removePlanetResponse: PlanetServiceProto.RemovePlanetResponse) {
if (removePlanetResponse.result) { scoreStub.addScore(AddScoreRequest { userName = destroyPlanetRequest.userName toAdd = destroyPlanetRequest.weight }, object : StreamObserver<Empty> by DefaultStreamObserver() {}) logStub.destroyedPlanet(destroyPlanetRequest, object : StreamObserver<Empty> by DefaultStreamObserver() {}) planetStub.generateNewPlanet(Empty.getDefaultInstance(),
  • bject : StreamObserver<PlanetProto.Planet> by DefaultStreamObserver() {
  • verride fun onNext(planet: PlanetProto.Planet) {
logStub.newPlanet(planet, object : StreamObserver<Empty> by DefaultStreamObserver() {}) listeners.forEach { it.onNext(Planets { addPlanets(populateWithCoordinates(planet, destroyPlanetRequest.coordinates.x, destroyPlanetRequest.coordinates.y)) }) } } }) } } }) } } }

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The whole destroy method...

  • verride fun destroy(responseObserver: StreamObserver<Planets>): StreamObserver<DestroyPlanetRequest> {
listeners.add(responseObserver) planetStub.getAllPlanets(Empty.getDefaultInstance(),
  • bject : StreamObserver<Planets> by DefaultStreamObserver() {
  • verride fun onNext(planets: Planets) {
responseObserver.onNext(populateWithCoordinnates(planets)) } }) return object : StreamObserver<DestroyPlanetRequest> by DefaultStreamObserver() {
  • verride fun onNext(destroyPlanetRequest: DestroyPlanetRequest) {
planetStub.removePlanet(RemovePlanetRequest { planetId = destroyPlanetRequest.planetId },
  • bject : StreamObserver<PlanetServiceProto.RemovePlanetResponse> by DefaultStreamObserver() {
  • verride fun onNext(removePlanetResponse: PlanetServiceProto.RemovePlanetResponse) {
if (removePlanetResponse.result) { scoreStub.addScore(AddScoreRequest { userName = destroyPlanetRequest.userName toAdd = destroyPlanetRequest.weight }, object : StreamObserver<Empty> by DefaultStreamObserver() {}) logStub.destroyedPlanet(destroyPlanetRequest, object : StreamObserver<Empty> by DefaultStreamObserver() {}) planetStub.generateNewPlanet(Empty.getDefaultInstance(),
  • bject : StreamObserver<PlanetProto.Planet> by DefaultStreamObserver() {
  • verride fun onNext(planet: PlanetProto.Planet) {
logStub.newPlanet(planet, object : StreamObserver<Empty> by DefaultStreamObserver() {}) listeners.forEach { it.onNext(Planets { addPlanets(populateWithCoordinates(planet, destroyPlanetRequest.coordinates.x, destroyPlanetRequest.coordinates.y)) }) } } }) } } }) } } }

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The whole destroy method...

  • verride fun destroy(responseObserver: StreamObserver<Planets>): StreamObserver<DestroyPlanetRequest> {
listeners.add(responseObserver) planetStub.getAllPlanets(Empty.getDefaultInstance(),
  • bject : StreamObserver<Planets> by DefaultStreamObserver() {
  • verride fun onNext(planets: Planets) {
responseObserver.onNext(populateWithCoordinnates(planets)) } }) return object : StreamObserver<DestroyPlanetRequest> by DefaultStreamObserver() {
  • verride fun onNext(destroyPlanetRequest: DestroyPlanetRequest) {
planetStub.removePlanet(RemovePlanetRequest { planetId = destroyPlanetRequest.planetId },
  • bject : StreamObserver<PlanetServiceProto.RemovePlanetResponse> by DefaultStreamObserver() {
  • verride fun onNext(removePlanetResponse: PlanetServiceProto.RemovePlanetResponse) {
if (removePlanetResponse.result) { scoreStub.addScore(AddScoreRequest { userName = destroyPlanetRequest.userName toAdd = destroyPlanetRequest.weight }, object : StreamObserver<Empty> by DefaultStreamObserver() {}) logStub.destroyedPlanet(destroyPlanetRequest, object : StreamObserver<Empty> by DefaultStreamObserver() {}) planetStub.generateNewPlanet(Empty.getDefaultInstance(),
  • bject : StreamObserver<PlanetProto.Planet> by DefaultStreamObserver() {
  • verride fun onNext(planet: PlanetProto.Planet) {
logStub.newPlanet(planet, object : StreamObserver<Empty> by DefaultStreamObserver() {}) listeners.forEach { it.onNext(Planets { addPlanets(populateWithCoordinates(planet, destroyPlanetRequest.coordinates.x, destroyPlanetRequest.coordinates.y)) }) } } }) } } }) } } }

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callback hell

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Why don’t you use futures?

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Destroy method is

  • verride fun destroy(responseObserver: StreamObserver<PlanetProto.Planets>): StreamObserver<DestroyPlanetRequest> {
listeners.add(responseObserver) GlobalScope.launch { val allPlanets = planetStub.getAllPlanets(Empty.getDefaultInstance()).await() responseObserver.onNext(populateWithCoordinnates(allPlanets)) } return object : StreamObserver<DestroyPlanetRequest> by DefaultStreamObserver() {
  • verride fun onNext(destroyPlanetRequest: DestroyPlanetRequest) {
GlobalScope.launch { val removePlanet = planetStub.removePlanet( RemovePlanetRequest { planetId = destroyPlanetRequest.planetId }).await() if (removePlanet.result) { scoreStub.addScore(AddScoreRequest { userName = destroyPlanetRequest.userName toAdd = destroyPlanetRequest.weight }) logStub.destroyedPlanet(destroyPlanetRequest) val newPlanet = planetStub.generateNewPlanet(Empty.getDefaultInstance()).await() logStub.newPlanet(newPlanet) listeners.forEach { it.onNext(Planets { addPlanets(populateWithCoordinates(newPlanet, destroyPlanetRequest.coordinates.x, destroyPlanetRequest.coordinates.y)) }) } } } } } }

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Destroy method is

  • verride fun destroy(responseObserver: StreamObserver<PlanetProto.Planets>): StreamObserver<DestroyPlanetRequest> {
listeners.add(responseObserver) GlobalScope.launch { val allPlanets = planetStub.getAllPlanets(Empty.getDefaultInstance()).await() responseObserver.onNext(populateWithCoordinnates(allPlanets)) } return object : StreamObserver<DestroyPlanetRequest> by DefaultStreamObserver() {
  • verride fun onNext(destroyPlanetRequest: DestroyPlanetRequest) {
GlobalScope.launch { val removePlanet = planetStub.removePlanet( RemovePlanetRequest { planetId = destroyPlanetRequest.planetId }).await() if (removePlanet.result) { scoreStub.addScore(AddScoreRequest { userName = destroyPlanetRequest.userName toAdd = destroyPlanetRequest.weight }) logStub.destroyedPlanet(destroyPlanetRequest) val newPlanet = planetStub.generateNewPlanet(Empty.getDefaultInstance()).await() logStub.newPlanet(newPlanet) listeners.forEach { it.onNext(Planets { addPlanets(populateWithCoordinates(newPlanet, destroyPlanetRequest.coordinates.x, destroyPlanetRequest.coordinates.y)) }) } } } } } }

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gRPC and coroutines II

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We need a new hero!

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Building microservices with Kotlin and gRPC

grpc-kotlin

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Destroy method is

  • verride suspend fun destroy(requests: ReceiveChannel<DestroyPlanetRequest>): ReceiveChannel<Planets> {

val channel = Channel<Planets>() listeners.add(channel) channel.send(populateWithCoordinnates(planetStub.getAllPlanets())) for (request in requests) { val wasRemoved = planetStub.removePlanet(RemovePlanetRequest { planetId = request.planetId }) if (wasRemoved.result) { scoreStub.addScore(AddScoreRequest { userName = request.userName toAdd = request.weight }) logStub.destroyedPlanet(request) val newPlanet = planetStub.generateNewPlanet() logStub.newPlanet(newPlanet) listeners.forEach { it.send(Planets { addPlanets(populateWithCoordinates(newPlanet, request.coordinates.x, request.coordinates.y)) }) } } } return channel } Building microservices with Kotlin and gRPC

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Destroy method is

  • verride fun destroy(requests: ReceiveChannel<DestroyPlanetRequest>): ReceiveChannel<Planets> {

val channel = Channel<Planets>() listeners.add(channel) channel.send(populateWithCoordinnates(planetStub.getAllPlanets())) for (request in requests) { val wasRemoved = planetStub.removePlanet(RemovePlanetRequest { planetId = request.planetId }) if (wasRemoved.result) { scoreStub.addScore(AddScoreRequest { userName = request.userName toAdd = request.weight }) logStub.destroyedPlanet(request) val newPlanet = planetStub.generateNewPlanet() logStub.newPlanet(newPlanet) listeners.forEach { it.send(Planets { addPlanets(populateWithCoordinates(newPlanet, request.coordinates.x, request.coordinates.y)) }) } } } return channel } Building microservices with Kotlin and gRPC

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We have another hero!

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kroto+

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Building microservices with Kotlin and gRPC

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Destroy method is

  • verride suspend fun destroy(requestChannel: ReceiveChannel<PlanetProto.DestroyPlanetRequest>,

responseChannel: SendChannel<PlanetProto.Planets>) { listeners.add(responseChannel) responseChannel.send(populateWithCoordinnates(planetStub.getAllPlanets())) for (request in requestChannel) { val wasRemoved = planetStub.removePlanet(RemovePlanetRequest { planetId = request.planetId }) if (wasRemoved.result) { scoreStub.addScore(AddScoreRequest { userName = request.userName toAdd = request.weight }) logStub.destroyedPlanet(request) val newPlanet = planetStub.generateNewPlanet() logStub.newPlanet(newPlanet) listeners.forEach { it.send(Planets { addPlanets(populateWithCoordinates(newPlanet, request.coordinates.x, request.coordinates.y)) }) } } } } Building microservices with Kotlin and gRPC

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Destroy method is

  • verride suspend fun destroy(requestChannel: ReceiveChannel<PlanetProto.DestroyPlanetRequest>,

responseChannel: SendChannel<PlanetProto.Planets>) { listeners.add(responseChannel) responseChannel.send(populateWithCoordinnates(planetStub.getAllPlanets())) for (request in requestChannel) { val wasRemoved = planetStub.removePlanet(RemovePlanetRequest { planetId = request.planetId }) if (wasRemoved.result) { scoreStub.addScore(AddScoreRequest { userName = request.userName toAdd = request.weight }) logStub.destroyedPlanet(request) val newPlanet = planetStub.generateNewPlanet() logStub.newPlanet(newPlanet) listeners.forEach { it.send(Planets { addPlanets(populateWithCoordinates(newPlanet, request.coordinates.x, request.coordinates.y)) }) } } } } Building microservices with Kotlin and gRPC

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More libs for Kotlin

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Expectation

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Reality

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/rouzwawi/grpc-kotlin.git

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https://github.com/marcoferrer/kroto-plus.git

A year ago

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https://github.com/marcoferrer/kroto-plus.git

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https://github.com/marcoferrer/kroto-plus.git

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Useful links

https://github.com/salesforce/grpc-java-contrib/ https://github.com/salesforce/reactive-grpc https://github.com/cretz/pb-and-k https://github.com/leveretka/grpc-death-star https://medium.com/@bimeshde/grpc-vs-rest-performance-simplified-fd35d01bbd4

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One day we’ll have a stable kotlin support

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We have a stable kotlin support!

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Time to summarize

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Takeaways

▪ Use gRPC for effective communications 99

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today 100

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today ▪ gRPC + Kotlin make things easier 101

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today ▪ gRPC + Kotlin make things easier ▪ Waiting for 1.0 release, flows... 102

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today ▪ gRPC + Kotlin make things easier ▪ Waiting for 1.0 release, flows...

▪ Feel free to contribute :)

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today ▪ gRPC + Kotlin make things easier ▪ Waiting for 1.0 release, flows...

▪ Feel free to contribute :) ▪ Don’t use grpc!

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Takeaways

▪ Use gRPC for effective communications ▪ gRPC + Kotlin can be used today ▪ gRPC + Kotlin make things easier ▪ Waiting for 1.0 release, flows...

▪ Feel free to contribute :) ▪ Don’t use grpc! (when don’t need it)

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Time to define the Death Star master

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Let’s say “Thank you”

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Without them I wouldn’t have done it!

Building microservices with Kotlin and gRPC

Ray Tsang Rouzbeh Delavari Marco Ferrer

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Without them I wouldn’t have done it!

Building microservices with Kotlin and gRPC

Alex Borysov Andrii Petryk George Lucas

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#KotlinConf

THANK YOU AND REMEMBER TO VOTE

Marharyta Nedzelska @jMargaritaN