Improve compose posting error messages

Pachyderm/Client.swift

@@ -50,22 +50,22 @@ public class Client {
         
         let task = session.dataTask(with: request) { data, response, error in
             if let error = error {
-                completion(.failure(error))
+                completion(.failure(.networkError(error)))
                 return
             }
             guard let data = data,
                 let response = response as? HTTPURLResponse else {
-                    completion(.failure(Error.invalidResponse))
+                    completion(.failure(.invalidResponse))
                     return
             }
             guard response.statusCode == 200 else {
                 let mastodonError = try? self.decoder.decode(MastodonError.self, from: data)
-                let error = mastodonError.flatMap { Error.mastodonError($0.description) } ?? Error.unknownError
+                let error: Error = mastodonError.flatMap { .mastodonError($0.description) } ?? .unexpectedStatus(response.statusCode)
                 completion(.failure(error))
                 return
             }
             guard let result = try? self.decoder.decode(Result.self, from: data) else {
-                completion(.failure(Error.invalidModel))
+                completion(.failure(.invalidModel))
                 return
             }
             let pagination = response.allHeaderFields["Link"].flatMap { $0 as? String }.flatMap(Pagination.init)
@@ -315,7 +315,8 @@ public class Client {
 
 extension Client {
     public enum Error: LocalizedError {
-        case unknownError
+        case networkError(Swift.Error)
+        case unexpectedStatus(Int)
         case invalidRequest
         case invalidResponse
         case invalidModel
@@ -323,8 +324,13 @@ extension Client {
         
         public var localizedDescription: String {
             switch self {
-            case .unknownError:
-                return "Unknown Error"
+            case .networkError(let error):
+                return "Network Error: \(error.localizedDescription)"
+            // todo: support more status codes
+            case .unexpectedStatus(413):
+                return "HTTP 413: Payload Too Large"
+            case .unexpectedStatus(let code):
+                return "HTTP Code \(code)"
             case .invalidRequest:
                 return "Invalid Request"
             case .invalidResponse:

Pachyderm/Response/Response.swift

@@ -10,5 +10,5 @@ import Foundation
 
 public enum Response<Result: Decodable> {
     case success(Result, Pagination?)
-    case failure(Error)
+    case failure(Client.Error)
 }

Pachyderm/Utilities/InstanceSelector.swift

@@ -22,16 +22,16 @@ public class InstanceSelector {
         let request = URLRequest(url: url)
         let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
             if let error = error {
-                completion(.failure(error))
+                completion(.failure(.networkError(error)))
                 return
             }
             guard let data = data,
                 let response = response as? HTTPURLResponse else {
-                    completion(.failure(Client.Error.invalidResponse))
+                    completion(.failure(.invalidResponse))
                     return
             }
             guard response.statusCode == 200 else {
-                completion(.failure(Client.Error.unknownError))
+                completion(.failure(.unexpectedStatus(response.statusCode)))
                 return
             }
             guard let result = try? decoder.decode([Instance].self, from: data) else {

Tusker/Screens/Compose/ComposeView.swift

@@ -12,14 +12,14 @@ import Combine
 
 struct ComposeView: View {
     @ObservedObject var draft: Draft
-    
     @EnvironmentObject var mastodonController: MastodonController
     @EnvironmentObject var uiState: ComposeUIState
-    @State var isPosting = false
-    @State var postProgress: Double = 0
-    @State var postTotalProgress: Double = 0
-    @State var isShowingPostErrorAlert = false
-    @State var postError: Error?
+    
+    @State private var isPosting = false
+    @State private var postProgress: Double = 0
+    @State private var postTotalProgress: Double = 0
+    @State private var isShowingPostErrorAlert = false
+    @State private var postError: PostError?
     
     private let stackPadding: CGFloat = 8
     
@@ -191,6 +191,9 @@ struct ComposeView: View {
             case let .failure(error):
                 self.isShowingPostErrorAlert = true
                 self.postError = error
+                self.postProgress = 0
+                self.postTotalProgress = 0
+                self.isPosting = false
             
             case let .success(uploadedAttachments):
                 let request = Client.createStatus(text: draft.text,
@@ -222,7 +225,7 @@ struct ComposeView: View {
         }
     }
     
-    private func uploadAttachments(_ completion: @escaping (Result<[Attachment], Error>) -> Void) {
+    private func uploadAttachments(_ completion: @escaping (Result<[Attachment], AttachmentUploadError>) -> Void) {
         let group = DispatchGroup()
         
         var anyFailed = false
@@ -239,13 +242,13 @@ struct ComposeView: View {
                 let formAttachment = FormAttachment(mimeType: mimeType, data: data, fileName: "file")
                 let request = Client.upload(attachment: formAttachment, description: compAttachment.attachmentDescription)
                 self.mastodonController.run(request) { (response) in
-                    postProgress += 1
-                    
                     switch response {
                     case let .failure(error):
                         uploadedAttachments[index] = .failure(error)
                         anyFailed = true
+                        
                     case let .success(attachment, _):
+                        postProgress += 1
                         uploadedAttachments[index] = .success(attachment)
                     }
                     
@@ -274,14 +277,37 @@ struct ComposeView: View {
     }
 }
 
-fileprivate struct AttachmentUploadError: LocalizedError {
+fileprivate protocol PostError: LocalizedError {}
+
+extension PostError {
+    var localizedDescription: String {
+        if let self = self as? Client.Error {
+            return self.localizedDescription
+        } else if let self = self as? AttachmentUploadError {
+            return self.localizedDescription
+        } else {
+            return "Unknown Error"
+        }
+    }
+}
+
+extension Client.Error: PostError {}
+
+fileprivate struct AttachmentUploadError: PostError {
     let errors: [Error?]
     
     var localizedDescription: String {
         return errors.enumerated().compactMap { (index, error) -> String? in
             guard let error = error else { return nil }
-            return "Attachment \(index + 1): \(error.localizedDescription)"
-        }.joined(separator: ", ")
+            let description: String
+            // need to downcast to use more specific localizedDescription impl from Pachyderm
+            if let error = error as? Client.Error {
+                description = error.localizedDescription
+            } else {
+                description = error.localizedDescription
+            }
+            return "Attachment \(index + 1): \(description)"
+        }.joined(separator: ",\n")
     }
 }
 

Tusker/Views/WrappedProgressView.swift

@@ -21,6 +21,8 @@ struct WrappedProgressView: UIViewRepresentable {
     func updateUIView(_ uiView: UIProgressView, context: Context) {
         if total > 0 {
             uiView.setProgress(Float(value / total), animated: true)
+        } else {
+            uiView.setProgress(0, animated: true)
         }
     }
 }