Move Lifecycle completely into EventLoop

Author: fabianfett

Sources/AWSLambdaRuntimeCore/Lambda.swift

@@ -106,14 +106,27 @@ public enum Lambda {
         Backtrace.install()
         var logger = Logger(label: "Lambda")
         logger.logLevel = configuration.general.logLevel
-        let lifecycle = Lifecycle(eventLoop: eventLoopGroup.next(), logger: logger, configuration: configuration, factory: factory)
-        let signalSource = trap(signal: configuration.lifecycle.stopSignal) { signal in
-            logger.info("intercepted signal: \(signal)")
-            lifecycle.shutdown()
-        }
-        return lifecycle.start().flatMap {
-            return lifecycle.shutdownFuture.always { _ in
-                signalSource.cancel()
+        let eventLoop = eventLoopGroup.next()
+        
+        return eventLoop.flatSubmit {
+            let lifecycle = Lifecycle(eventLoop: eventLoopGroup.next(), logger: logger, configuration: configuration, factory: factory)
+            
+            #if DEBUG
+            // We only offer coordinated shutdown in DEBUG, since Lambda functions
+            // running on AWS are not shutdown in a coordinated way.
+            let signalSource = trap(signal: configuration.lifecycle.stopSignal) { signal in
+                logger.info("intercepted signal: \(signal)")
+                lifecycle.shutdown()
+            }
+            #endif
+            
+            return lifecycle.start().flatMap {
+                let future = lifecycle.shutdownFuture
+                #if DEBUG
+                    return future.always { _ in signalSource.cancel() }
+                #else
+                    return future
+                #endif
             }
         }
     }