Network Layer now supports Custom Error Response models

Author: burak.uzunboy

Sources/UsefulNetworkLayer/Extensions/UIImage+ResponseImage.swift

@@ -24,7 +24,7 @@ public extension UIImage {
             case .failure(_):
                 completion(nil)
             case .success(let response):
-                completion(response.responseBody.image)
+                completion(response.responseBody?.image)
             }
         }
 

Sources/UsefulNetworkLayer/Extensions/UIImageView+ImageURL.swift

@@ -77,8 +77,8 @@ public extension UIImageView {
                     completion?(fallback)
                 case .success(let image):
                     if self.tag == dateTag {
-                        self.image = image.responseBody.image
-                        completion?(image.responseBody.image)
+                        self.image = image.responseBody?.image
+                        completion?(image.responseBody?.image)
                     }
                 }
             }

Sources/UsefulNetworkLayer/NetworkLayer/APIStructs.swift

@@ -56,12 +56,12 @@ extension Array: ResponseBodyParsable where Element: ResponseBodyParsable {
 public struct APIResponse<T> where T: ResponseBodyParsable {
 
     /// Response body of the API request.
-    public private(set) var responseBody: T
+    public private(set) var responseBody: T?
 
     /// Main URL response of the API request.
     public private(set) var response: URLResponse
 
-    internal init(response: URLResponse, responseBody: T) {
+    internal init(response: URLResponse, responseBody: T?) {
         self.response = response
         self.responseBody = responseBody
     }

Sources/UsefulNetworkLayer/NetworkLayer/NetworkLayer.swift

@@ -207,13 +207,19 @@ public class NetworkLayer: NSObject, URLSessionDataDelegate {
             do {
                 message.customMessage = (try JSONDecoder().decode(request.errorResponseBodyObject.T.self, from: data))
             } catch {
-                self.sendLog(message: "Custom error message couldn't be created for Lperation: \(operationId)", logType: .info)
+                self.sendLog(message: "Custom error message couldn't be created for Operation: \(operationId)", logType: .info)
             }
             self.sendLog(message: "HTTP Request failed with status \(statusCode) \(message)", logType: .error(code: statusCode, name: ""))
             completion(.failure(.init(request: request, error: message)))
             return
         }
 
+        guard data.count > 0 else {
+            self.sendLog(message: "Data of the response is empty - Ignoring response creation - Operation: \(operationId)", logType: .info)
+            completion(.success(.init(response: response, responseBody: nil)))
+            return
+        }
+        
         if !request.responseBodyObject.shouldUseCustomInitializer {
             do {
                 let jsonObject = try JSONDecoder().decode(request.responseBodyObject, from: data)

Tests/iOSUsefulNetworkLayerTests/iOSUsefulNetworkLayerTests.swift

@@ -30,7 +30,7 @@ final class iOSUsefulNetworkLayerTests: XCTestCase {
         apiReq.request { (result) in
             switch result {
             case .failure(let err):
-                XCTFail("Error: \(err.errorReason.error?.localizedDescription)")
+                XCTFail("Error: \(err.errorReason.error?.localizedDescription ?? "")")
                 break
             case .success(let obj):
                 print(obj)
@@ -44,14 +44,15 @@ final class iOSUsefulNetworkLayerTests: XCTestCase {
     func testNetworkLayerArray() {
         let exp = XCTestExpectation(description: "Network layer should response success")
 
-        let api = APIConfiguration<[ExampleResponseObject], DefaultAPIError>(hostURL: "https://jsonplaceholder.typicode.com",
-                                                                             endPoint: "todos",
-                                                                             requestType: .get,
-                                                                             headers: nil, body: nil,
-                                                                             responseBodyObject: [ExampleResponseObject].self,
-                                                                             priority: .low,
-                                                                             cachingTime: .init(seconds: 60),
-                                                                             isMainOperation: false, autoCache: true)
+        let api = APIConfiguration(hostURL: "https://jsonplaceholder.typicode.com",
+                                   endPoint: "todos",
+                                   requestType: .get,
+                                   headers: nil, body: nil,
+                                   responseBodyObject: [ExampleResponseObject].self,
+                                   errorType: DefaultAPIError.self,
+                                   priority: .low,
+                                   cachingTime: .init(seconds: 60),
+                                   isMainOperation: false, autoCache: true)
 
         guard let apiReq = api else {
             XCTFail()
@@ -61,7 +62,7 @@ final class iOSUsefulNetworkLayerTests: XCTestCase {
         apiReq.request { (result) in
             switch result {
             case .failure(let err):
-                XCTFail("Error: \(err.errorReason.error?.localizedDescription)")
+                XCTFail("Error: \(err.errorReason.error?.localizedDescription ?? "")")
                 break
             case .success(let obj):
                 print(obj)