make explicit that we ignore ChannelError I/O on closed channel during shutdown

Author: sebsto

Sources/AWSLambdaRuntime/Lambda+LocalServer.swift

@@ -51,11 +51,21 @@ extension Lambda {
         logger: Logger,
         _ body: sending @escaping () async throws -> Void
     ) async throws {
-        _ = try await LambdaHTTPServer.withLocalServer(
-            invocationEndpoint: invocationEndpoint,
-            logger: logger
-        ) {
-            try await body()
+        do {
+            try await LambdaHTTPServer.withLocalServer(
+                invocationEndpoint: invocationEndpoint,
+                logger: logger
+            ) {
+                try await body()
+            }
+        } catch let error as ChannelError {
+            // when this server is part of a ServiceLifeCycle group 
+            // and user presses CTRL-C, this error is thrown
+            // The error description is "I/O on closed channel"
+            // TODO: investigate and solve the root cause
+            // because this server is used only for local tests
+            // and the error happens when we shutdown the server, I decided to ignore it at the moment.
+            logger.trace("Ignoring ChannelError during local server shutdown: \(error)")
         }
     }
 }
@@ -106,7 +116,7 @@ internal struct LambdaHTTPServer {
         eventLoopGroup: MultiThreadedEventLoopGroup = .singleton,
         logger: Logger,
         _ closure: sending @escaping () async throws -> Result
-    ) async throws -> Swift.Result<Result, any Error> {
+    ) async throws -> Result {
         let channel = try await ServerBootstrap(group: eventLoopGroup)
             .serverChannelOption(.backlog, value: 256)
             .serverChannelOption(.socketOption(.so_reuseaddr), value: 1)
@@ -227,7 +237,7 @@ internal struct LambdaHTTPServer {
         if case .failure(let error) = result {
             logger.error("Error during server shutdown: \(error)")
         }
-        return result
+        return try result.get()
     }
 
     /// This method handles individual TCP connections