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mokagiomokagio
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Wrap .org XML RPC error enum in an Error-conforming struct
Jumping through this hoop was necessary to avoid the Swift compiler automatically generating an error domain for the `Error` and making it impossible to successfully redefine the domain at the `CustomNSError` conformance site.
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‎CHANGELOG.md‎

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@@ -30,6 +30,24 @@ _None._
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-->
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## Unreleased
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### Breaking Changes
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- The Objective-C-visible `WordPressOrgXMLRPCError` `enum` has been renamed to `WordPressOrgXMLRPCErrorCode` [#790]
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### New Features
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_None._
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### Bug Fixes
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_None._
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### Internal Changes
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_None._
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## 17.0.0
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### Breaking Changes

‎Sources/CoreAPI/WordPressOrgXMLRPCApi.swift‎

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@@ -288,43 +288,6 @@ private class SessionDelegate: NSObject, URLSessionDelegate {
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}
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}
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}
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// Hack to avoid the Swift compiler generating a domain constant for us that would then conflict with the one we define in APIInterface.
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// The automatic generation occurs, as far as I can tell, because of @objc and Error, neither of which we can remove.
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// Reminder: We define our own constant for the domain so that we can conform WordPressOrgXMLRPCApiError to CustomNSError.
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typealias WordPressOrgXMLRPCApiError = WordPressOrgXMLRPCAPIError
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/// Error constants for the WordPress XML-RPC API
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@objc public enum WordPressOrgXMLRPCAPIError: Int, Error, CaseIterable {
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/// An error HTTP status code was returned.
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case httpErrorStatusCode
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/// The serialization of the request failed.
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case requestSerializationFailed
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/// The serialization of the response failed.
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case responseSerializationFailed
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/// An unknown error occurred.
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case unknown
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}
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extension WordPressOrgXMLRPCApiError: LocalizedError {
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public var errorDescription: String? {
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return NSLocalizedString("There was a problem communicating with the site.", comment: "A general error message shown to the user when there was an API communication failure.")
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}
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public var failureReason: String? {
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switch self {
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case .httpErrorStatusCode:
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return NSLocalizedString("An HTTP error code was returned.", comment: "A failure reason for when an error HTTP status code was returned from the site.")
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case .requestSerializationFailed:
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return NSLocalizedString("The serialization of the request failed.", comment: "A failure reason for when the request couldn't be serialized.")
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case .responseSerializationFailed:
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return NSLocalizedString("The serialization of the response failed.", comment: "A failure reason for when the response couldn't be serialized.")
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case .unknown:
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return NSLocalizedString("An unknown error occurred.", comment: "A failure reason for when the error that occured wasn't able to be determined.")
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}
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}
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}
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public struct WordPressOrgXMLRPCApiFault: LocalizedError, HTTPURLResponseProviding {
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public var response: HTTPAPIResponse<Data>
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public let code: Int?
@@ -352,7 +315,13 @@ private extension WordPressAPIResult<HTTPAPIResponse<Data>, WordPressOrgXMLRPCAp
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// https://github.com/wordpress-mobile/WordPressKit-iOS/blob/11.0.0/WordPressKit/WordPressOrgXMLRPCApi.swift#L265
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flatMap { response in
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guard let contentType = response.response.allHeaderFields["Content-Type"] as? String else {
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return .failure(.unparsableResponse(response: response.response, body: response.body, underlyingError: WordPressOrgXMLRPCApiError.unknown))
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return .failure(
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.unparsableResponse(
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response: response.response,
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body: response.body,
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underlyingError: WordPressOrgXMLRPCApiError(code: .unknown)
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)
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)
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}
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if (400..<600).contains(response.response.statusCode) {
@@ -366,7 +335,13 @@ private extension WordPressAPIResult<HTTPAPIResponse<Data>, WordPressOrgXMLRPCAp
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}
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guard contentType.hasPrefix("application/xml") || contentType.hasPrefix("text/xml") else {
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return .failure(.unparsableResponse(response: response.response, body: response.body, underlyingError: WordPressOrgXMLRPCApiError.unknown))
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return .failure(
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.unparsableResponse(
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response: response.response,
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body: response.body,
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underlyingError: WordPressOrgXMLRPCApiError(code: .unknown)
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)
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)
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}
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guard let decoder = WPXMLRPCDecoder(data: response.body) else {
@@ -418,7 +393,7 @@ private extension WordPressAPIError where EndpointError == WordPressOrgXMLRPCApi
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data = fault.response.body
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statusCode = nil
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case let .unacceptableStatusCode(response, body):
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error = WordPressOrgXMLRPCApiError.httpErrorStatusCode as NSError
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error = WordPressOrgXMLRPCApiError(code: .httpErrorStatusCode) as NSError
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data = body
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statusCode = response.statusCode
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case let .unparsableResponse(_, body, underlyingError):

‎Sources/CoreAPI/WordPressOrgXMLRPCApiError+NSErrorBridge.swift‎

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@@ -8,7 +8,7 @@ extension WordPressOrgXMLRPCApiError: CustomNSError {
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public static let errorDomain = WordPressOrgXMLRPCApiErrorDomain
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public var errorCode: Int { self.rawValue }
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public var errorCode: Int { code.rawValue }
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public var errorUserInfo: [String: Any] { [:] }
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}

‎Sources/CoreAPI/WordPressOrgXMLRPCApiError.swift‎

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@@ -0,0 +1,39 @@
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import Foundation
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/// Error constants for the WordPress XML-RPC API
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@objc public enum WordPressOrgXMLRPCApiErrorCode: Int, CaseIterable {
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/// An error HTTP status code was returned.
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case httpErrorStatusCode
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/// The serialization of the request failed.
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case requestSerializationFailed
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/// The serialization of the response failed.
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case responseSerializationFailed
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/// An unknown error occurred.
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case unknown
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}
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public struct WordPressOrgXMLRPCApiError: Error {
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let code: WordPressOrgXMLRPCApiErrorCode
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}
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extension WordPressOrgXMLRPCApiError: LocalizedError {
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public var errorDescription: String? {
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return NSLocalizedString(
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"There was a problem communicating with the site.",
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comment: "A general error message shown to the user when there was an API communication failure."
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)
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}
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public var failureReason: String? {
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switch code {
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case .httpErrorStatusCode:
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return NSLocalizedString("An HTTP error code was returned.", comment: "A failure reason for when an error HTTP status code was returned from the site.")
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case .requestSerializationFailed:
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return NSLocalizedString("The serialization of the request failed.", comment: "A failure reason for when the request couldn't be serialized.")
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case .responseSerializationFailed:
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return NSLocalizedString("The serialization of the response failed.", comment: "A failure reason for when the response couldn't be serialized.")
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case .unknown:
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return NSLocalizedString("An unknown error occurred.", comment: "A failure reason for when the error that occured wasn't able to be determined.")
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}
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}
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}

‎Tests/CoreAPITests/WordPressOrgXMLRPCApiErrorTests.swift‎

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@@ -9,8 +9,8 @@ import XCTest
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class WordPressOrgXMLRPCApiErrorTests: XCTestCase {
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func testNSErrorBridging() throws {
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for error in WordPressOrgXMLRPCApiError.allCases {
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let xmlRPCError = try XCTUnwrap(WordPressOrgXMLRPCApiError(rawValue: error.rawValue))
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for error in WordPressOrgXMLRPCApiErrorCode.allCases {
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let xmlRPCError = try XCTUnwrap(WordPressOrgXMLRPCApiError(code: error))
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let apiError = WordPressAPIError.endpointError(xmlRPCError)
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let newNSError = apiError as NSError
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‎Tests/CoreAPITests/WordPressOrgXMLRPCApiTests.swift‎

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@@ -65,7 +65,7 @@ class WordPressOrgXMLRPCApiTests: XCTestCase {
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failure: { (error, _) in
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expect.fulfill()
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XCTAssertEqual(error.domain, WordPressOrgXMLRPCApiErrorDomain)
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XCTAssertEqual(error.code, WordPressOrgXMLRPCApiError.httpErrorStatusCode.rawValue)
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XCTAssertEqual(error.code, WordPressOrgXMLRPCApiErrorCode.httpErrorStatusCode.rawValue)
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XCTAssertEqual(error.localizedFailureReason, "An HTTP error code 404 was returned.")
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XCTAssertNotNil(error.userInfo[WordPressOrgXMLRPCApi.WordPressOrgXMLRPCApiErrorKeyData as String])
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XCTAssertNotNil(error.userInfo[WordPressOrgXMLRPCApi.WordPressOrgXMLRPCApiErrorKeyStatusCode as String])
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failure: { (error, _) in
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expect.fulfill()
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XCTAssertTrue(error is WordPressOrgXMLRPCApiError)
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XCTAssertEqual(error.domain, WordPressOrgXMLRPCApiErrorDomain)
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XCTAssertEqual(error.code, WordPressOrgXMLRPCApiError.unknown.rawValue)
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XCTAssertEqual(error.localizedFailureReason, WordPressOrgXMLRPCApiError.unknown.failureReason)
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let errorUnknonw = WordPressOrgXMLRPCApiError(code: .unknown)
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XCTAssertEqual(error.code, errorUnknonw.code.rawValue)
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XCTAssertEqual(error.localizedFailureReason, errorUnknonw.failureReason)
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XCTAssertNotNil(error.userInfo[WordPressOrgXMLRPCApi.WordPressOrgXMLRPCApiErrorKeyData as String])
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XCTAssertNil(error.userInfo[WordPressOrgXMLRPCApi.WordPressOrgXMLRPCApiErrorKeyStatusCode as String])
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}

‎WordPressKit.xcodeproj/project.pbxproj‎

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3F8308A729EE683500354497 /* ActivityTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3F8308A629EE683500354497 /* ActivityTests.swift */; };
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3FA4258F2BCCFDA6007539BF /* WordPressComRestApiErrorDomain.h in Headers */ = {isa = PBXBuildFile; fileRef = 3FA4258E2BCCFDA6007539BF /* WordPressComRestApiErrorDomain.h */; settings = {ATTRIBUTES = (Public, ); }; };
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3FA425A72BCF7EDC007539BF /* WordPressOrgXMLRPCApiErrorDomain.h in Headers */ = {isa = PBXBuildFile; fileRef = 3FA425A62BCF7E7C007539BF /* WordPressOrgXMLRPCApiErrorDomain.h */; settings = {ATTRIBUTES = (Public, ); }; };
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3FA425A92BCF8721007539BF /* WordPressOrgXMLRPCApiError.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FA425A82BCF8721007539BF /* WordPressOrgXMLRPCApiError.swift */; };
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3FB8642C2888089F003A86BE /* BuildkiteTestCollector in Frameworks */ = {isa = PBXBuildFile; productRef = 3FB8642B2888089F003A86BE /* BuildkiteTestCollector */; };
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3FD634E52BC3A55F00CEDF5E /* WordPressOrgXMLRPCValidator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FD634E32BC3A55F00CEDF5E /* WordPressOrgXMLRPCValidator.swift */; };
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3FD634E62BC3A55F00CEDF5E /* Date+WordPressCom.swift in Sources */ = {isa = PBXBuildFile; fileRef = 3FD634E42BC3A55F00CEDF5E /* Date+WordPressCom.swift */; };
@@ -821,6 +822,7 @@
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3F8308A629EE683500354497 /* ActivityTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ActivityTests.swift; sourceTree = "<group>"; };
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3FA4258E2BCCFDA6007539BF /* WordPressComRestApiErrorDomain.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = WordPressComRestApiErrorDomain.h; sourceTree = "<group>"; };
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3FA425A62BCF7E7C007539BF /* WordPressOrgXMLRPCApiErrorDomain.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = WordPressOrgXMLRPCApiErrorDomain.h; sourceTree = "<group>"; };
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3FA425A82BCF8721007539BF /* WordPressOrgXMLRPCApiError.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WordPressOrgXMLRPCApiError.swift; sourceTree = "<group>"; };
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3FB8642D288813E9003A86BE /* UnitTests.xctestplan */ = {isa = PBXFileReference; lastKnownFileType = text; path = UnitTests.xctestplan; sourceTree = "<group>"; };
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3FD634E32BC3A55F00CEDF5E /* WordPressOrgXMLRPCValidator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = WordPressOrgXMLRPCValidator.swift; sourceTree = "<group>"; };
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3FD634E42BC3A55F00CEDF5E /* Date+WordPressCom.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = "Date+WordPressCom.swift"; sourceTree = "<group>"; };
@@ -2143,6 +2145,7 @@
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3FE2E97A2BC3A332002CA2E1 /* WordPressComRestApi.swift */,
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4A05E7992B2FDC3200C25E3B /* WordPressOrgRestApi.swift */,
21452147
93BD27791EE73944002BB00B /* WordPressOrgXMLRPCApi.swift */,
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3FA425A82BCF8721007539BF /* WordPressOrgXMLRPCApiError.swift */,
21462149
3F6128122BCB31660063810D /* WordPressOrgXMLRPCApiError+NSErrorBridge.swift */,
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3FD634E32BC3A55F00CEDF5E /* WordPressOrgXMLRPCValidator.swift */,
21482151
93BD277B1EE73944002BB00B /* WordPressRSDParser.swift */,
@@ -3314,6 +3317,7 @@
33143317
9AB6D647218705E90008F274 /* RemoteDiff.swift in Sources */,
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93BD277C1EE73944002BB00B /* HTTPAuthenticationAlertController.swift in Sources */,
33163319
7433BC011EFC4505002D9E92 /* PlanServiceRemote.swift in Sources */,
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3FA425A92BCF8721007539BF /* WordPressOrgXMLRPCApiError.swift in Sources */,
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4041405E220F9EF500CF7C5B /* StatsDotComFollowersInsight.swift in Sources */,
33183322
74650F721F0EA1A700188EDB /* GravatarServiceRemote.swift in Sources */,
33193323
B5969E1D20A49AC4005E9DF1 /* NSString+MD5.m in Sources */,

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