From 34c538420219bf3ffd1e6bd4f66a498729564630 Mon Sep 17 00:00:00 2001
From: TATSUNO Yasuhiro <ytatsuno.jp@gmail.com>
Date: Fri, 24 Dec 2021 10:32:00 +0900
Subject: [PATCH] Change (Async)Handler to js.Function so it can be handler
 directly

---
 README.md                                     | 97 ++++++-------------
 .../exoego/facade/aws_lambda/Handler.scala    | 11 +--
 2 files changed, 29 insertions(+), 79 deletions(-)

diff --git a/README.md b/README.md
index 2e1da2c..94dbab3 100644
--- a/README.md
+++ b/README.md
@@ -32,82 +32,39 @@ libraryDependencies += "net.exoego" %%% "aws-lambda-scalajs-facade" % "0.11.0"
 Import and code.
 
 ```scala
+import scala.concurrent.{ExecutionContext, Future}
 import scala.scalajs.js
+import scala.scalajs.js.JSConverters._
+import scala.scalajs.js.annotation._
 import net.exoego.facade.aws_lambda._
 
-object MyFirstLambda extends APIGatewayProxyHandler {
-  @js.annotation.JSName("apply")
-  override def apply(event: APIGatewayProxyEvent, context: Context, callback: Callback[APIGatewayProxyResult]): Unit = ???
-}
-
-object MyFirstAsyncLambda extends AsyncAPIGatewayProxyHandler {
-  @js.annotation.JSName("apply")
-  override def apply(event: APIGatewayProxyEvent, context: Context): js.Promise[APIGatewayProxyResult]  = ???
+object Main {
+  @JSExportTopLevel("handler")
+  val handler: AsyncAPIGatewayProxyHandler = (event, context) => {
+    val json = js.JSON.stringify(event)
+    js.Dynamic.global.console.log(json)
+
+    implicit val ec = ExecutionContext.global
+    handle(event).toJSPromise
+  }
+
+  private def handle(event: APIGatewayProxyEvent)(implicit ec: ExecutionContext): Future[APIGatewayProxyResult] = Future {
+    APIGatewayProxyResult(
+      statusCode = 200,
+      body = "hello " + event.body,
+      headers = js.defined(js.Dictionary("Content-Type" -> "text/plain"))
+    )
+  }
 }
 ```
 
-Below is the available list of the pre-defined handler traits:
-
-* ALB
-    * ALBHandler
-* API Gateway
-    * APIGatewayProxyHandler
-    * APIGatewayProxyHandlerV2
-    * APIGatewayRequestAuthorizerHandler
-    * APIGatewayRequestAuthorizerWithContextHandler
-    * APIGatewayTokenAuthorizerHandler
-    * APIGatewayTokenAuthorizerWithContextHandler
-    * CustomAuthorizerHandler
-    * ProxyHandler (alias of APIGatewayProxyHandler)
-* AppSync
-    * AppSyncResolverHandler
-* CloudFormation
-    * CloudFormationCustomResourceHandler
-* CloudFront
-    * CloudFrontRequestHandler
-    * CloudFrontResponseHandler
-* CloudWatch
-    * CloudWatchLogsHandler
-    * ScheduledHandler
-* CodeBuild
-    * CodeBuildCloudWatchStateHandler
-* CodePipeline
-    * CodePipelineCloudWatchActionHandler
-    * CodePipelineCloudWatchHandler
-    * CodePipelineCloudWatchPipelineHandler
-    * CodePipelineCloudWatchStageHandler
-    * CodePipelineHandler
-* Cognito
-    * CognitoUserPoolTriggerHandler
-    * CreateAuthChallengeTriggerHandler
-    * CustomMessageTriggerHandler
-    * DefineAuthChallengeTriggerHandler
-    * PostAuthenticationTriggerHandler
-    * PostConfirmationTriggerHandler
-    * PreAuthenticationTriggerHandler
-    * PreSignUpTriggerHandler
-    * PreTokenGenerationTriggerHandler
-    * UserMigrationTriggerHandler
-    * VerifyAuthChallengeResponseTriggerHandler
-* DynamoDB
-    * DynamoDBStreamHandler
-* EventBridge
-    * EventBridgeHandler
-* Firehose
-    * FirehoseTransformationHandler
-* Kinesis
-    * KinesisStreamHandler
-* Lex
-    * LexHandler
-* S3
-    * S3BatchHandler
-    * S3Handler
-* SES
-    * SESHandler
-* SNS
-    * SNSHandler
-* SQS
-    * SQSHandler
+Some of pre-defined handler traits:
+
+* APIGatewayProxyHandlerV2
+* AppSyncResolverHandler
+* DynamoDBStreamHandler
+* S3Handler
+* SNSHandler
 
 Each has `Async~` variant that returns `js.Promise` instead of accepting callback.
 
diff --git a/src/main/scala/net/exoego/facade/aws_lambda/Handler.scala b/src/main/scala/net/exoego/facade/aws_lambda/Handler.scala
index e8f4f7f..1d637b4 100644
--- a/src/main/scala/net/exoego/facade/aws_lambda/Handler.scala
+++ b/src/main/scala/net/exoego/facade/aws_lambda/Handler.scala
@@ -1,7 +1,6 @@
 package net.exoego.facade.aws_lambda
 
 import scala.scalajs.js
-import scala.scalajs.js.annotation.JSName
 import scala.scalajs.js.|
 
 /** Callback-style handler
@@ -9,20 +8,14 @@ import scala.scalajs.js.|
   * @tparam TEvent
   * @tparam TResult
   */
-trait Handler[TEvent, TResult] extends js.Object {
-  @JSName("apply")
-  def apply(event: TEvent, context: Context, callback: Callback[TResult]): Unit
-}
+trait Handler[TEvent, TResult] extends js.Function3[TEvent, Context, Callback[TResult], Unit] {}
 
 /** Asynchronous-style handler that returns js.Promise. This can be used Node.js 8 runtime or more
   *
   * @tparam TEvent
   * @tparam TResult
   */
-trait AsyncHandler[TEvent, TResult] extends js.Object {
-  @JSName("apply")
-  def apply(event: TEvent, context: Context): js.Promise[TResult]
-}
+trait AsyncHandler[TEvent, TResult] extends js.Function2[TEvent, Context, js.Promise[TResult]] {}
 
 @js.native
 trait Context extends js.Object {