TCA and Network Client

[panviktor]

Hello everyone. I am trying to adapt a Network Client to the TCA architecture and can't find serious examples. In my MVVM project, I have a Network Client that handles creating requests, processing errors, refreshing tokens, and depending on the error, it can either navigate the user to the login screen or just display errors in pop-up windows. I understand how to create simple effects, but is it possible to implement this globally? For example:

     return performRequest(
                    execute: { environment.dependencies.usersRepository.logout() },
                    successAction: { .logoutResponse(.success($0)) },
                    failureAction: { .logoutResponse(.failure($0)) }
                )

    static func handleError(_ error: NetworkClientError) -> Effect<UserAction, Never> {
        switch error {
        case .unauthorized, .tokenRefreshFailed, .logoutImmediately:
            // Trigger global navigation to LoginView
            return Effect(value: .navigateToLogin)
        default:
            // Show an alert with the error message
            return Effect(value: .showAlert(errorMessage(for: error)))
        }
    }

    public func send<T: Decodable>(_ type: T.Type, request: Request) async throws -> T {
        do {
            return try await performRequest(request)
        }
        catch NetworkClientError.retryWithNewToken {
            let newToken = try await performRefreshRequest()
            guard let providerToken = newToken as? Provider.Token else {
                throw NetworkClientError.unauthorized
            }
            try await tokenProvider.setToken(providerToken)
            return try await performRequest(request)
        }
        catch NetworkClientError.showAlert(let message) {
            throw NetworkClientError.showAlert(message: message)
            // IN REAL APP  here notification for SwiftUI  but how make it in TCA?
        }
        catch
            NetworkClientError.unauthorized,
            NetworkClientError.tokenRefreshFailed,
            NetworkClientError.logoutImmediately {
            try await logout()
            throw NetworkClientError.unauthorized
        // IN REAL APP  here notification for  user manager and change View
        } catch {
            throw error
        }
    }

The main problem is that I didn’t need to handle every request and response, the manager took care of that. Now I only understand how to handle each request very locally.