Add runLoop function

Sources/AWSLambdaRuntimeCore/NewLambda.swift

@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftAWSLambdaRuntime open source project
+//
+// Copyright (c) 2024 Apple Inc. and the SwiftAWSLambdaRuntime project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftAWSLambdaRuntime project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import Dispatch
+import Logging
+import NIOCore
+
+package protocol StreamingLambdaHandler {
+    mutating func handle(
+        _ event: ByteBuffer,
+        responseWriter: some LambdaResponseStreamWriter,
+        context: NewLambdaContext
+    ) async throws
+}
+
+package enum NewLambda {
+    package static func runLoop<RuntimeClient: LambdaRuntimeClientProtocol, Handler>(
+        runtimeClient: RuntimeClient,
+        handler: Handler,
+        logger: Logger
+    ) async throws
+    where Handler: StreamingLambdaHandler {
+        while !Task.isCancelled {
+            let (invocation, writer) = try await runtimeClient.nextInvocation()
+
+            var handler = handler
+            do {
+                try await handler.handle(
+                    invocation.event,
+                    responseWriter: writer,
+                    context: NewLambdaContext(
+                        requestID: invocation.metadata.requestID,
+                        traceID: invocation.metadata.traceID,
+                        invokedFunctionARN: invocation.metadata.invokedFunctionARN,
+                        deadline: DispatchWallTime(millisSinceEpoch: invocation.metadata.deadlineInMillisSinceEpoch),
+                        logger: logger
+                    )
+                )
+            } catch {
+                try await writer.reportError(error)
+                continue
+            }
+        }
+    }
+}