Refactoring

submodules/TelegramCore/Sources/State/AppChangelog.swift

@@ -0,0 +1,44 @@
+import Foundation
+import Postbox
+import SwiftSignalKit
+import MtProtoKit
+import TelegramApi
+
+import SyncCore
+
+func managedAppChangelog(postbox: Postbox, network: Network, stateManager: AccountStateManager, appVersion: String) -> Signal<Void, NoError> {
+    return stateManager.pollStateUpdateCompletion()
+    |> take(1)
+    |> mapToSignal { _ -> Signal<Void, NoError> in
+        return postbox.transaction { transaction -> AppChangelogState in
+            return transaction.getPreferencesEntry(key: PreferencesKeys.appChangelogState) as? AppChangelogState ?? AppChangelogState.default
+        }
+        |> mapToSignal { appChangelogState -> Signal<Void, NoError> in
+            let appChangelogState = appChangelogState
+            if appChangelogState.checkedVersion == appVersion {
+                return .complete()
+            }
+            let previousVersion = appChangelogState.previousVersion
+            return network.request(Api.functions.help.getAppChangelog(prevAppVersion: previousVersion))
+            |> map(Optional.init)
+            |> `catch` { _ -> Signal<Api.Updates?, NoError> in
+                return .single(nil)
+            }
+            |> mapToSignal { updates -> Signal<Void, NoError> in
+                if let updates = updates {
+                    stateManager.addUpdates(updates)
+                }
+                
+                return postbox.transaction { transaction in
+                    updateAppChangelogState(transaction: transaction, { state in
+                        var state = state
+                        state.checkedVersion = appVersion
+                        state.previousVersion = appVersion
+                        return state
+                    })
+                }
+            }
+        }
+    }
+}
+