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TelegramCore/ManagedSynchronizeSavedGifsOperations.swift

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+import Foundation
+#if os(macOS)
+    import PostboxMac
+    import SwiftSignalKitMac
+    import MtProtoKitMac
+#else
+    import Postbox
+    import SwiftSignalKit
+    import MtProtoKitDynamic
+#endif
+
+private final class ManagedSynchronizeSavedGifsOperationsHelper {
+    var operationDisposables: [Int32: Disposable] = [:]
+    
+    func update(_ entries: [PeerMergedOperationLogEntry]) -> (disposeOperations: [Disposable], beginOperations: [(PeerMergedOperationLogEntry, MetaDisposable)]) {
+        var disposeOperations: [Disposable] = []
+        var beginOperations: [(PeerMergedOperationLogEntry, MetaDisposable)] = []
+        
+        var hasRunningOperationForPeerId = Set<PeerId>()
+        var validMergedIndices = Set<Int32>()
+        for entry in entries {
+            if !hasRunningOperationForPeerId.contains(entry.peerId) {
+                hasRunningOperationForPeerId.insert(entry.peerId)
+                validMergedIndices.insert(entry.mergedIndex)
+                
+                if self.operationDisposables[entry.mergedIndex] == nil {
+                    let disposable = MetaDisposable()
+                    beginOperations.append((entry, disposable))
+                    self.operationDisposables[entry.mergedIndex] = disposable
+                }
+            }
+        }
+        
+        var removeMergedIndices: [Int32] = []
+        for (mergedIndex, disposable) in self.operationDisposables {
+            if !validMergedIndices.contains(mergedIndex) {
+                removeMergedIndices.append(mergedIndex)
+                disposeOperations.append(disposable)
+            }
+        }
+        
+        for mergedIndex in removeMergedIndices {
+            self.operationDisposables.removeValue(forKey: mergedIndex)
+        }
+        
+        return (disposeOperations, beginOperations)
+    }
+    
+    func reset() -> [Disposable] {
+        let disposables = Array(self.operationDisposables.values)
+        self.operationDisposables.removeAll()
+        return disposables
+    }
+}
+
+private func withTakenOperation(postbox: Postbox, peerId: PeerId, tag: PeerOperationLogTag, tagLocalIndex: Int32, _ f: @escaping (Modifier, PeerMergedOperationLogEntry?) -> Signal<Void, NoError>) -> Signal<Void, NoError> {
+    return postbox.modify { modifier -> Signal<Void, NoError> in
+        var result: PeerMergedOperationLogEntry?
+        modifier.operationLogUpdateEntry(peerId: peerId, tag: tag, tagLocalIndex: tagLocalIndex, { entry in
+            if let entry = entry, let _ = entry.mergedIndex, entry.contents is SynchronizeSavedGifsOperation  {
+                result = entry.mergedEntry!
+                return PeerOperationLogEntryUpdate(mergedIndex: .none, contents: .none)
+            } else {
+                return PeerOperationLogEntryUpdate(mergedIndex: .none, contents: .none)
+            }
+        })
+        
+        return f(modifier, result)
+        } |> switchToLatest
+}
+
+func managedSynchronizeSavedGifsOperations(postbox: Postbox, network: Network) -> Signal<Void, NoError> {
+    return Signal { _ in
+        let tag: PeerOperationLogTag = OperationLogTags.SynchronizeSavedGifs
+        
+        let helper = Atomic<ManagedSynchronizeSavedGifsOperationsHelper>(value: ManagedSynchronizeSavedGifsOperationsHelper())
+        
+        let disposable = postbox.mergedOperationLogView(tag: tag, limit: 10).start(next: { view in
+            let (disposeOperations, beginOperations) = helper.with { helper -> (disposeOperations: [Disposable], beginOperations: [(PeerMergedOperationLogEntry, MetaDisposable)]) in
+                return helper.update(view.entries)
+            }
+            
+            for disposable in disposeOperations {
+                disposable.dispose()
+            }
+            
+            for (entry, disposable) in beginOperations {
+                let signal = withTakenOperation(postbox: postbox, peerId: entry.peerId, tag: tag, tagLocalIndex: entry.tagLocalIndex, { modifier, entry -> Signal<Void, NoError> in
+                    if let entry = entry {
+                        if let operation = entry.contents as? SynchronizeSavedGifsOperation {
+                            return synchronizeSavedGifs(modifier: modifier, postbox: postbox, network: network, operation: operation)
+                        } else {
+                            assertionFailure()
+                        }
+                    }
+                    return .complete()
+                })
+                    |> then(postbox.modify { modifier -> Void in
+                        let _ = modifier.operationLogRemoveEntry(peerId: entry.peerId, tag: tag, tagLocalIndex: entry.tagLocalIndex)
+                    })
+                
+                disposable.set(signal.start())
+            }
+        })
+        
+        return ActionDisposable {
+            let disposables = helper.with { helper -> [Disposable] in
+                return helper.reset()
+            }
+            for disposable in disposables {
+                disposable.dispose()
+            }
+            disposable.dispose()
+        }
+    }
+}
+
+private func synchronizeSavedGifs(modifier: Modifier, postbox: Postbox, network: Network, operation: SynchronizeSavedGifsOperation) -> Signal<Void, NoError> {
+    switch operation.content {
+        case let .add(id, accessHash):
+            return network.request(Api.functions.messages.saveGif(id: .inputDocument(id: id, accessHash: accessHash), unsave: .boolFalse))
+                |> `catch` { _ -> Signal<Api.Bool, NoError> in
+                    return .single(.boolFalse)
+                }
+                |> mapToSignal { _ -> Signal<Void, NoError> in
+                    return .complete()
+                }
+        case let .remove(id, accessHash):
+            return network.request(Api.functions.messages.saveGif(id: .inputDocument(id: id, accessHash: accessHash), unsave: .boolTrue))
+                |> `catch` { _ -> Signal<Api.Bool, NoError> in
+                    return .single(.boolFalse)
+                }
+                |> mapToSignal { _ -> Signal<Void, NoError> in
+                    return .complete()
+                }
+        case .sync:
+            return managedRecentGifs(postbox: postbox, network: network)
+    }
+}