move OpenAPILambda's creation to the library

Author: sebsto

Examples/quoteapi/Sources/QuoteAPI/QuoteService.swift

@@ -25,10 +25,7 @@ struct QuoteServiceImpl: APIProtocol, OpenAPILambdaHttpApi {
     }
 
     static func main() async throws {
-        let lambda = try OpenAPILambdaHandler<QuoteServiceImpl>()
-
-        // Instantiate LambdaRuntime with a handler implementing the business logic of the Lambda function
-        let lambdaRuntime = LambdaRuntime(body: lambda.handler)
+        let lambdaRuntime = try LambdaRuntime(body: Self.handler())
         try await lambdaRuntime.run()
     }
 

Sources/OpenAPILambda.swift

@@ -38,3 +38,9 @@ public protocol OpenAPILambda: Sendable {
     /// - Parameter from: response from OpenAPIRuntime
     func output(from: OpenAPILambdaResponse) -> Output
 }
+
+extension OpenAPILambda {
+    public static func handler() throws -> @Sendable (Event, LambdaContext) async throws -> Output {
+        try OpenAPILambdaHandler<Self>().handler
+    }
+}