Use Swift Foundation Result type to represent a value and error in example

Author: DJBen

CHANGELOG.md

@@ -17,3 +17,9 @@
 * Retain subcomponent graphs  
   [Sebastian Shanus](https://github.com/sebastianv1)
   [#42](https://github.com/square/Cleanse/issues/42)
+
+#### Improvements
+
+* Replace demo app's ErrorOptional type with Swift Foundation Result type
+  [Sihao Lu](https://github.com/DJBen)
+  [#126](https://github.com/square/Cleanse/pull/126)

Examples/CleanseGithubBrowser/CleanseGithubBrowser.xcodeproj/project.pbxproj

@@ -12,7 +12,6 @@
 		F69184B31D0DF28A00125872 /* GithubMemberService.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184B21D0DF28A00125872 /* GithubMemberService.swift */; };
 		F69184B61D0DF2CA00125872 /* GithubRepositoriesService.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184B51D0DF2CA00125872 /* GithubRepositoriesService.swift */; };
 		F69184BB1D0DF3DD00125872 /* NetworkModule.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184BA1D0DF3DD00125872 /* NetworkModule.swift */; };
-		F69184BD1D0DF5DC00125872 /* ErrorOptional.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184BC1D0DF5DC00125872 /* ErrorOptional.swift */; };
 		F69184BF1D0DF70F00125872 /* HTTPError.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184BE1D0DF70F00125872 /* HTTPError.swift */; };
 		F69184C31D0DFB4A00125872 /* GithubServicesModule.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184C21D0DFB4A00125872 /* GithubServicesModule.swift */; };
 		F69184C61D0E015A00125872 /* NSURLSessionAdditions.swift in Sources */ = {isa = PBXBuildFile; fileRef = F69184C51D0E015A00125872 /* NSURLSessionAdditions.swift */; };
@@ -107,7 +106,6 @@
 		F69184B21D0DF28A00125872 /* GithubMemberService.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GithubMemberService.swift; sourceTree = "<group>"; };
 		F69184B51D0DF2CA00125872 /* GithubRepositoriesService.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GithubRepositoriesService.swift; sourceTree = "<group>"; };
 		F69184BA1D0DF3DD00125872 /* NetworkModule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NetworkModule.swift; sourceTree = "<group>"; };
-		F69184BC1D0DF5DC00125872 /* ErrorOptional.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ErrorOptional.swift; sourceTree = "<group>"; };
 		F69184BE1D0DF70F00125872 /* HTTPError.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HTTPError.swift; sourceTree = "<group>"; };
 		F69184C21D0DFB4A00125872 /* GithubServicesModule.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = GithubServicesModule.swift; sourceTree = "<group>"; };
 		F69184C51D0E015A00125872 /* NSURLSessionAdditions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = NSURLSessionAdditions.swift; sourceTree = "<group>"; };
@@ -164,7 +162,6 @@
 		F69184B71D0DF32800125872 /* Services */ = {
 			isa = PBXGroup;
 			children = (
-				F69184BC1D0DF5DC00125872 /* ErrorOptional.swift */,
 				F69184CF1D0E33F600125872 /* FakeModeSettings.swift */,
 				F69184CD1D0E31F200125872 /* FakeServices.swift */,
 				F69184B21D0DF28A00125872 /* GithubMemberService.swift */,
@@ -464,7 +461,6 @@
 				F6E878301D0BD911006F3FAB /* SettingsPage.swift in Sources */,
 				884618AF1D9324AD0001ADEB /* AppComponent.swift in Sources */,
 				F6E878321D0D1120006F3FAB /* RepositoriesPage.swift in Sources */,
-				F69184BD1D0DF5DC00125872 /* ErrorOptional.swift in Sources */,
 				F6E878381D0DD11A006F3FAB /* SplitViewController.swift in Sources */,
 				F69184D21D0E357600125872 /* FoundationCommonModule.swift in Sources */,
 			);
@@ -651,7 +647,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.squareup.CleanseGithubBrowserTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/CleanseGithubBrowser.app/CleanseGithubBrowser";
 			};
 			name = Debug;
@@ -664,7 +660,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.squareup.CleanseGithubBrowserTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/CleanseGithubBrowser.app/CleanseGithubBrowser";
 			};
 			name = Release;
@@ -676,7 +672,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.squareup.CleanseGithubBrowserUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TEST_TARGET_NAME = CleanseGithubBrowser;
 			};
 			name = Debug;
@@ -688,7 +684,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.squareup.CleanseGithubBrowserUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 5.0;
 				TEST_TARGET_NAME = CleanseGithubBrowser;
 			};
 			name = Release;

Examples/CleanseGithubBrowser/CleanseGithubBrowser/ErrorOptional.swift

@@ -36,9 +36,9 @@ struct FakeGithubServicesModule : GithubServicesModule {
 
 
 struct FakeGithubMembersService : GithubMembersService {
-    func list(handler: @escaping (ErrorOptional<[GithubMember]>) -> Void) {
+    func list(handler: @escaping (Result<[GithubMember], Error>) -> Void) {
         DispatchQueue.main.async() { 
-            handler(.init([
+            handler(.success([
                 GithubMember(login: "abrons"),
                 GithubMember(login: "mikelikespie"),
                 GithubMember(login: "holmes"),
@@ -48,9 +48,9 @@ struct FakeGithubMembersService : GithubMembersService {
 }
 
 struct FakeGithubRepositoriesService : GithubRepositoriesService {
-    func list(_ handler: @escaping (ErrorOptional<[GithubRepository]>) -> Void) {
+    func list(_ handler: @escaping (Result<[GithubRepository], Error>) -> Void) {
         DispatchQueue.main.async() {
-            handler(.init([
+            handler(.success([
                 GithubRepository(name: "okhttp", watchersCount: 11_917),
                 GithubRepository(name: "cleanse", watchersCount: 42)
             ]))

Examples/CleanseGithubBrowser/CleanseGithubBrowser/FakeServices.swift

@@ -20,7 +20,7 @@ struct GithubMember {
 
 /// Service that lists "Member" for the current organization
 protocol GithubMembersService {
-    func list(handler: @escaping (ErrorOptional<[GithubMember]>) -> Void)
+    func list(handler: @escaping (Result<[GithubMember], Error>) -> Void)
 }
 
 struct GithubMembersServiceImpl : GithubMembersService {
@@ -30,7 +30,7 @@ struct GithubMembersServiceImpl : GithubMembersService {
     let urlSession: URLSession
 
     /// Lists members of an organization
-    func list(handler: @escaping (ErrorOptional<[GithubMember]>) -> Void) {
+    func list(handler: @escaping (Result<[GithubMember], Error>) -> Void) {
         urlSession.jsonListTask(
             baseURL: githubURL.get(),
             pathComponents: "orgs", githubOrganizationName.get(), "public_members") { result in

Examples/CleanseGithubBrowser/CleanseGithubBrowser/GithubMemberService.swift

@@ -23,7 +23,7 @@ struct GithubRepository {
 
 /// Service that lists repositories for the current user
 protocol GithubRepositoriesService {
-    func list(_ handler: @escaping (ErrorOptional<[GithubRepository]>) -> Void)
+    func list(_ handler: @escaping (Result<[GithubRepository], Error>) -> Void)
 }
 
 struct GithubRepositoriesServiceImpl : GithubRepositoriesService {
@@ -32,7 +32,7 @@ struct GithubRepositoriesServiceImpl : GithubRepositoriesService {
 
     let urlSession: URLSession
 
-    func list(_ handler: @escaping (ErrorOptional<[GithubRepository]>) -> Void) {
+    func list(_ handler: @escaping (Result<[GithubRepository], Error>) -> Void) {
         urlSession.jsonListTask(
             baseURL: githubURL.get(),
             pathComponents: "users", githubOrganizationName.get(), "repos",

Examples/CleanseGithubBrowser/CleanseGithubBrowser/GithubRepositoriesService.swift

@@ -10,22 +10,22 @@ import Foundation
 
 
 extension URLSession {
-    func jsonTask(baseURL: URL, pathComponents: String..., resultHandler: @escaping (ErrorOptional<Any>) -> Void) -> URLSessionDataTask {
+    func jsonTask(baseURL: URL, pathComponents: String..., resultHandler: @escaping (Result<Any, Error>) -> Void) -> URLSessionDataTask {
         let url = baseURL.appendingPathComponent(pathComponents.joined(separator: "/"))
         return jsonTask(url: url as URL, resultHandler: resultHandler)
     }
 
-    private func jsonTask(url: URL, resultHandler: @escaping (ErrorOptional<Any>) -> Void) -> URLSessionDataTask {
+    private func jsonTask(url: URL, resultHandler: @escaping (Result<Any, Error>) -> Void) -> URLSessionDataTask {
         let task = self.dataTask(with: url as URL) { (data, response, error) in
             if let error: Error = error ?? HTTPError(statusCode: (response as! HTTPURLResponse).statusCode) {
-                resultHandler(ErrorOptional(error))
+                resultHandler(.failure(error))
                 return
             }
 
             do {
-                try resultHandler(ErrorOptional(JSONSerialization.jsonObject(with: data!, options: [])))
+                try resultHandler(.success(JSONSerialization.jsonObject(with: data!, options: [])))
             } catch let e {
-                resultHandler(ErrorOptional(e))
+                resultHandler(.failure(e))
                 return
             }
         }
@@ -39,7 +39,7 @@ extension URLSession {
         baseURL: URL,
         pathComponents: String...,
         query: String? = nil,
-        resultHandler: @escaping (ErrorOptional<[[String: AnyObject]]>) -> Void
+        resultHandler: @escaping (Result<[[String: AnyObject]], Error>) -> Void
     ) -> URLSessionDataTask {
         var url = baseURL.appendingPathComponent(pathComponents.joined(separator: "/"))