org.http4k.jsonrpc.MethodBindings.kt Maven / Gradle / Ivy

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Http4k JSON-RPC support

There is a newer version: 5.41.0.0

package org.http4k.jsonrpc

import org.http4k.format.Json
import org.http4k.format.JsonLibAutoMarshallingJson

interface MethodBindings : Iterable> {
    fun method(name: String, handler: JsonRpcHandler)

    companion object {
        open class Manual(private val json: Json) :
            MethodBindings {
            override fun iterator() = methodMappings
                .map { JsonRpcMethodBinding(it.key, it.value) }.iterator()

            private val methodMappings = mutableMapOf>()

            override fun method(name: String, handler: JsonRpcHandler) {
                methodMappings[name] = handler
            }

            fun  handler(paramsLens: Mapping,
                                        resultLens: Mapping,
                                        fn: (IN) -> OUT): JsonRpcHandler =
                handler(emptySet(), paramsLens, resultLens, fn)

            fun  handler(paramsFieldNames: Set,
                                        paramsLens: Mapping,
                                        resultLens: Mapping,
                                        fn: (IN) -> OUT): JsonRpcHandler =
                ParamMappingJsonRequestHandler(json, paramsFieldNames, paramsLens, fn, resultLens)

            fun  handler(resultLens: Mapping, block: () -> OUT): JsonRpcHandler =
                NoParamsJsonRequestHandler(block, resultLens)
        }

        class Auto(val json: JsonLibAutoMarshallingJson) :
            Manual(json) {

            inline fun  handler(paramsFieldNames: Set,
                                                             noinline fn: (IN) -> OUT): JsonRpcHandler =
                handler(paramsFieldNames, Mapping { json.asA(it, IN::class) }, Mapping { json.asJsonObject(it) }, fn)

            inline fun  handler(noinline fn: (IN) -> OUT): JsonRpcHandler =
                handler(IN::class.javaObjectType.declaredFields.map { it.name }.toSet(), fn)

            fun  handler(fn: () -> OUT): JsonRpcHandler =
                handler(Mapping { json.asJsonObject(it) }, fn)
        }
    }
}