kilua-rpc

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Fullstack RPC library for Kotlin/Wasm and Kotlin/JS

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# Kilua RPC

Fullstack RPC library for Kotlin/Wasm and Kotlin/JS.

[![Maven Central](https://img.shields.io/maven-central/v/dev.kilua/kilua-rpc-core.svg?label=Maven%20Central)](https://central.sonatype.com/search?namespace=dev.kilua&name=kilua-rpc-core)
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

Kilua RPC is a powerful Remote Procedure Call (RPC) library designed for fullstack applications 
created with the Kotlin programming language. It can be used with frontend apps developed for 
[Kotlin/Wasm](https://kotlinlang.org/docs/wasm-overview.html) and [Kotlin/JS](https://kotlinlang.org/docs/js-overview.html) targets. On the backend side different popular Kotlin/JVM web frameworks 
are fully supported:

- [Ktor](https://ktor.io/)
- [Jooby](https://jooby.io)
- [Spring Boot](https://spring.io/projects/spring-boot)
- [Javalin](https://javalin.io)
- [Vert.x](https://vertx.io)
- [Micronaut](https://micronaut.io)

Kilua RPC is a new project, but it is mostly based on stable and production ready 
fullstack interfaces implemented in the [KVision](https://kvision.io) framework.

Kilua RPC can be used with all Kotlin/JS and Kotlin/Wasm web frameworks to easily build fullstack 
applications with shared code for data model and business logic.

## Features

- Compile the same application code for Kotlin/Wasm and Kotlin/JS targets.
- Support for serializable [kotlinx-datetime](https://github.com/Kotlin/kotlinx-datetime) types.
- Built-in `Decimal` type automatically mapped to `Double` in the 
browser and to `BigDecimal` on the server. 
- Support for `Result<T>` as a return type of remote methods.
- Automatic exceptions propagation from the server to the client, 
including support for custom exception types.
- Support two-way communication with [WebSockets](https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API).
- Support [SSE (Server-Sent Events)](https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events).
- Automatic endpoints generation configurable with simple annotations.
- Gradle plugin for easy project setup and packaging.

## Code overview

This is a short overview of how to use Kilua RPC. It contains just the basic concepts and ideas.

### Common source set

Declare an annotated interface with one or more suspending methods.

```kotlin
import dev.kilua.rpc.annotations.RpcService
import kotlinx.serialization.Serializable

@Serializable
enum class EncodingType {
    BASE64, URLENCODE, HEX
}

@RpcService
interface IEncodingService {
    suspend fun encode(input: String, encodingType: EncodingType): String
}
```
### Frontend source set

Just use the class instance provided by the library calling its methods directly.

```kotlin
import dev.kilua.rpc.getService

val service = getService<IEncodingService>()
launch {
    val result: String = service.encode("Lorem ipsum", EncodingType.BASE64)
    // do something with the result
}
```
### Backend source set (Ktor)

Implement the interface and initialize the library routing with a few lines of code.

```kotlin
import java.net.URLEncoder
import acme.Base64Encoder
import acme.HexEncoder
import dev.kilua.rpc.applyRoutes
import dev.kilua.rpc.getAllServiceManagers
import dev.kilua.rpc.initRpc
import io.ktor.server.application.*
import io.ktor.server.plugins.compression.*
import io.ktor.server.routing.*

class EncodingService : IEncodingService {
    override suspend fun encode(input: String, encodingType: EncodingType): String {
        return when (encodingType) {
                EncodingType.BASE64 -> {
                    Base64Encoder.encode(input)
                }
                EncodingType.URLENCODE -> {
                    URLEncoder.encode(input, "UTF-8")
                }
                EncodingType.HEX -> {
                    HexEncoder.encode(input)
                }
        }
    }
}

fun Application.main() {
    install(Compression)
    routing {
        getAllServiceManagers().forEach { applyRoutes(it) }
    }
    initRpc {
        registerService<IEncodingService> { EncodingService() }
    }
}
```
Everything else happens automatically - a call on the client side will run the code on the server and the result will be sent back to the caller.

## Documentation

The comprehensive [Kilua RPC guide](https://kilua.gitbook.io/kilua-rpc-guide) is published on GitBook.

## Examples

Each application server is configured a bit differently. You can check
the `examples` directory for simple applications created with all supported servers. 
You will notice the frontend applications are identical - the only real difference 
is the backend app dependencies list and the main initialization code.

## Gradle tasks

Kilua RPC gradle plugin defines custom tasks to run and package fullstack applications. 
No matter which server is used these tasks are always available:

- `jsBrowserDevelopmentRun` - run the frontend JS application in the development mode
- `wasmJsBrowserDevelopmentRun` - run the frontend WASM application in the development mode
- `jvmRun` - run the backend application in the development mode
- `jarWithJs` - package the fullstack application with JS frontend as a single JAR file
- `jarWithWasmJs` - package the fullstack application with WASM frontend as a single JAR file

## Leave a star

If you like this project, please give it a star on GitHub. Thank you!

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