feral.lambda.natchez.KernelSource.scala Maven / Gradle / Ivy

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/*
 * Copyright 2021 Typelevel
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package feral.lambda.natchez

import feral.lambda.events.ApiGatewayProxyEventV2
import feral.lambda.events.DynamoDBStreamEvent
import natchez.Kernel

trait KernelSource[Event] {
  def extract(event: Event): Kernel
}

object KernelSource {
  @inline def apply[E](implicit ev: KernelSource[E]): ev.type = ev

  implicit val apiGatewayProxyEventV2KernelSource: KernelSource[ApiGatewayProxyEventV2] =
    e => Kernel(e.headers)

  implicit val dynamoDBStreamEventKernelSource: KernelSource[DynamoDBStreamEvent] =
    emptyKernelSource

  def emptyKernelSource[E]: KernelSource[E] = _ => Kernel(Map.empty)
}