Implement Request and Response

Author: giginet

Sources/AWSLambdaRuntime/AWSLambdaRuntime.swift

@@ -1,3 +1,46 @@
-struct AWSLambdaRuntime {
-    var text = "Hello, World!"
+import Foundation
+
+public struct Runtime {
+    public struct Request {
+        let payload: Data
+        let requestID: String
+        let xrayTraceID: String
+        let clientContext: String
+        let cognitoIdentifier: String
+        let functionARN: String
+        let deadline: Date
+        var remainingTime: Date {
+            return Date()
+        }
+    }
+    
+    public enum Response {
+        case success(payload: Data, contentType: String)
+        case failure(errorMessage: String, errorType: String)
+        
+        private struct RawError: Encodable {
+            let errorMessage: String
+            let errorType: String
+            let stackTrace: [String] = []
+        }
+        
+        public var payload: Data {
+            switch self {
+            case .success(let payload, _):
+                return payload
+            case .failure(let errorMessage, let errorType):
+                let error = RawError(errorMessage: errorMessage, errorType: errorType)
+                return try! JSONEncoder().encode(error)
+            }
+        }
+        
+        public var contentType: String {
+            switch self {
+            case .success(_, let contentType):
+                return contentType
+            case .failure:
+                return "application/json"
+            }
+        }
+    }
 }