42 lines
1.2 KiB
Swift
42 lines
1.2 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import Combine
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import Foundation
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import ServiceLayer
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enum IdentificationError: Error {
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case initialIdentityValueAbsent
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}
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public final class Identification: ObservableObject {
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@Published private(set) var identity: Identity
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let service: IdentityService
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let observationErrors: AnyPublisher<Error, Never>
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init(service: IdentityService) throws {
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self.service = service
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// The scheduling on the observation is immediate so an initial value can be extracted
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let sharedObservation = service.observation().share()
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var initialIdentity: Identity?
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_ = sharedObservation.first().sink(
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receiveCompletion: { _ in },
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receiveValue: { initialIdentity = $0 })
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guard let identity = initialIdentity else { throw IdentificationError.initialIdentityValueAbsent }
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self.identity = identity
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let observationErrorsSubject = PassthroughSubject<Error, Never>()
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observationErrors = observationErrorsSubject.eraseToAnyPublisher()
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sharedObservation.catch { error -> Empty<Identity, Never> in
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observationErrorsSubject.send(error)
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return Empty()
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}
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.assign(to: &$identity)
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}
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}
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