Added error handler so user can respond to a specific error differently (especially NoInternetConnection)

Author: Lukasz Pomianek

Sources/WebRequest/Delivery/HTTPWebRequestDelivery.swift

@@ -103,21 +103,28 @@ open class HTTPWebRequestDelivery : NSObject, WebRequestDelivery {
         let group = DispatchGroup()
         var taskData: Data?
         var taskResponse: HTTPURLResponse?
+        var errorCode: ErrorCode?
 
         group.enter()
         queue.async {
             let task = urlSession.dataTask(
                 with: urlRequest,
-                completionHandler: ({ (data, response, _) in
+                completionHandler: ({ (data, response, error) in
                     taskData = data
                     taskResponse = response as? HTTPURLResponse
+                    errorCode = self.parseError(error)
                     group.leave()
                 }))
             task.resume()
         }
 
         let timeoutResult = group.wait(timeout: .now() + timeoutInterval)
 
+        if let errorCode = errorCode {
+            try complete(request: request, errorCode: errorCode)
+            return
+        }
+
         guard (timeoutResult != .timedOut) else {
             try complete(request: request, errorCode: .TimedOut)
             return
@@ -150,4 +157,19 @@ open class HTTPWebRequestDelivery : NSObject, WebRequestDelivery {
         let result = WebRequest.Result(status: status, headers: [:] , data: nil)
         try request.onDataReceived?(result, request, percentComplete, target);
     }
+    
+    open func parseError(_ error: Error?) -> ErrorCode? {
+        guard let error = error else { return nil }
+        if let urlError = error as? URLError {
+            switch urlError.code {
+            case .notConnectedToInternet:
+                return .NoInternetConnection
+            case .timedOut:
+                return .TimedOut
+            default:
+                ()
+            }
+        }
+        return .MalformedResponse
+    }
 }

Sources/WebRequest/WebRequest+Result.swift

@@ -12,6 +12,7 @@ extension WebRequest {
             case MalformedURL  = -8
             case MalformedResponse = -11
             case TimedOut = -12
+            case NoInternetConnection = -13
         }
 
         public init(status: Int) {