rsocket-kotlin-router

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rsocket-kotlin-router

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Kotlin RSocket Server Router

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# RSocket Router

`rsocket-kotlin-router` is a customisable library designed to streamline and simplify routing
for RSocket Kotlin server applications. This library offers a typesafe DSL for handling various
routes, serving as a declarative simplified alternative to manual routing that would
otherwise result in long-winded ternary logic or exhaustive when statements.

Library provides the following features:

- [Routing Builder](#how-to-use)
- [Interceptors](#Interceptors)
- [Request Versioning](router-versioning)
- [Request Serialization](router-serialization)

## How to use

First of all, you need to implement basic artifacts with routing support. For now, `rsocket-kotlin-router`
is available only at my self-hosted maven:

```kotlin
repositories {
    maven("https://maven.y9vad9.com")
}

dependencies {
    implementation("com.y9vad9.rsocket.router:router-core:$version")
}
```

> For now, it's available for JVM only, but as there is no JVM platform API used,
> new targets will be available [upon your request](https://github.com/y9vad9/rsocket-kotlin-router/issues/new).

Example of defining RSocket router:

```kotlin
val serverRouter = router {
    routeSeparator = '.'
    routeProvider { metadata: ByteReadPacket? ->
        metadata?.read(RoutingMetadata)?.tags?.first()
            ?: throw RSocketError.Invalid("No routing metadata was provided")
    }

routing { // this: RoutingBuilder
        route("authorization") {
            requestResponse("register") { payload: Payload ->
                // just 4 example
                println(payload.data.readText())
                Payload.Empty
            }
        }
    }
}
```

See also what else is supported:

<details id="Interceptors">
 <summary>Interceptors</summary>
Interceptors are experimental feature: API can be changed in the future.

Preprocessors

Preprocessors are utilities that run before routing feature applies. For cases, when you need to transform input into
something or propagate
values using coroutines – you can
extend [`Preprocessor.Modifier`](https://github.com/y9vad9/rsocket-kotlin-router/blob/2a794e9a8c5d2ac53cb87ea58cfbe4a2ecfa217d/router-core/src/commonMain/kotlin/com.y9vad9.rsocket.router/interceptors/Interceptor.kt#L39)
or [`Preprocessor.CoroutineContext`](https://github.com/y9vad9/rsocket-kotlin-router/blob/master/router-core/src/commonMain/kotlin/com.y9vad9.rsocket.router/interceptors/Interceptor.kt#L31).
Here's an example:

```kotlin
class MyCoroutineContextElement(val value: String) : CoroutineContext.Element {... }

@OptIn(ExperimentalInterceptorsApi::class)
class MyCoroutineContextPreprocessor : Preprocessor.CoroutineContext {
    override fun intercept(coroutineContext: CoroutineContext, input: Payload): CoroutineContext {
        return coroutineContext + MyCoroutineContextElement(value = "smth")
    }
}
```

Route Interceptors

In addition to the `Preprocessors`, `rsocket-kotlin-router` also provides API to intercept specific routes:

```kotlin
@OptIn(ExperimentalInterceptorsApi::class)
class MyRouteInterceptor : RouteInterceptor.Modifier {
    override fun intercept(route: String, input: Payload): Payload {
        return Payload.Empty // just for example
    }
}
```

Installation

```kotlin
val serverRouter = router {
    preprocessors {
        forCoroutineContext(MyCoroutineContextPreprocessor())
    }

sharedInterceptors {
        forModification(MyRouteInterceptor())
    }
}
```

</details>

<details>
 <summary>Versioning support</summary>

Here's example of how request versioning looks like:
```kotlin
requestResponseV("foo") {
    version(1) { payload: Payload ->
        // handle requests for version "1.0"
        Payload.Empty
    }
    version(2) { payload: Payload ->
        // handle requests for version "2.0"
        Payload.Empty
    }
}
```

For details, please refer to the [versioning guide](router-versioning/README.md).
</details>

<details>
 <summary>Serialization support</summary>

Here is example of how type-safe requests with serialization/deserialization mechanisms look like:
```kotlin
requestResponse<Foo, Bar>("register") { foo: Foo ->
 return@requestResponse Bar(/* ... */)
}

// or versioned variant:

requestResponseV("register") {
    version(1) { foo: Foo ->
        Bar(/* ... */)
    }

version(2) { qux: Qux ->
        FizzBuzz(/* ... */)
    }
}
```

For details, please refer to the [serialization guide](router-serialization/README.md).
</details>

<details>
 <summary>Testing</summary>

`rsocket-kotlin-router` provides ability to test your routes with `router-test` artifact:

```kotlin
dependencies {
    implementation("com.y9vad9.rsocket.router:router-test:$version")
}
```

```kotlin
@Test
fun testRoutes() {
    runBlocking {
        val route1 = router.routeAtOrAssert("test")
        val route2 = router.routeAtOrAssert("test.subroute")

route1.assertHasInterceptor<MyInterceptor>()
 route2.assertHasInterceptor<MyInterceptor>()

route2.fireAndForgetOrAssert(buildPayload {
            data("test")
        })
    }
}
```

You can refer to the [example](router-core/test/src/jvmTest/kotlin/com/y9vad9/rsocket/router/test/RouterTest.kt) for
more details.
</details>

## Bugs and Feedback

For bugs, questions and discussions please use
the [GitHub Issues](https://github.com/y9vad9/rsocket-kotlin-router/issues).

## License

This library is licensed under [MIT License](LICENSE). Feel free to use, modify, and distribute it for any purpose.

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