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1	import Foundation
2	import RastrilloApple
3
4	/// The transport supplier a window hands its workspace, for one account.
5	///
6	/// A workspace's model can outlive a session of its account, so it asks for
7	/// the connection's current client on every request instead of keeping one.
8	/// It must never be handed another account's session, even for a moment:
9	/// SwiftUI can still be finishing a request or holding a stream for the old
10	/// workspace after the window switches accounts.
11	public enum DocsAccountTransport {
12	@MainActor public static func supplier(account: String?,
13	active: @escaping @MainActor () -> String?,
14	client: @escaping @MainActor () -> NativeTransport?) -> @MainActor () -> NativeTransport? {
15	return {
16	// Checked on every request, not when the supplier is made: a
17	// switch can land while a save or stream reconnect is in flight.
18	guard let account, active() == account else { return nil }
19	return client()
20	}
21	}
22	}
23