Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Postbox/Sources/PeerStoryStatsView.swift

@@ -0,0 +1,76 @@
+import Foundation
+
+final class MutablePeerStoryStatsView: MutablePostboxView {
+    let peerIds: Set<PeerId>
+    var storyStats: [PeerId: PeerStoryStats] = [:]
+
+    init(postbox: PostboxImpl, peerIds: Set<PeerId>) {
+        self.peerIds = peerIds
+        for id in self.peerIds {
+            if let value = fetchPeerStoryStats(postbox: postbox, peerId: id) {
+                self.storyStats[id] = value
+            }
+        }
+    }
+    
+    func replay(postbox: PostboxImpl, transaction: PostboxTransaction) -> Bool {
+        var updated = false
+        var updatedPeerIds = Set<PeerId>()
+        for event in transaction.currentStoryTopItemEvents {
+            if case let .replace(peerId) = event {
+                if self.peerIds.contains(peerId) {
+                    updatedPeerIds.insert(peerId)
+                }
+            }
+        }
+        for event in transaction.storyPeerStatesEvents {
+            if case let .set(key) = event, case let .peer(peerId) = key {
+                if self.peerIds.contains(peerId) {
+                    updatedPeerIds.insert(peerId)
+                }
+            }
+        }
+        
+        for id in updatedPeerIds {
+            let value = fetchPeerStoryStats(postbox: postbox, peerId: id)
+            if self.storyStats[id] != value {
+                updated = true
+                
+                if let value = value {
+                    self.storyStats[id] = value
+                } else {
+                    self.storyStats.removeValue(forKey: id)
+                }
+            }
+        }
+        
+        return updated
+    }
+
+    func refreshDueToExternalTransaction(postbox: PostboxImpl) -> Bool {
+        var storyStats: [PeerId: PeerStoryStats] = [:]
+        for id in self.peerIds {
+            if let value = fetchPeerStoryStats(postbox: postbox, peerId: id) {
+                storyStats[id] = value
+            }
+        }
+        if self.storyStats != storyStats {
+            self.storyStats = storyStats
+            return true
+        } else {
+            return false
+        }
+    }
+    
+    func immutableView() -> PostboxView {
+        return PeerStoryStatsView(self)
+    }
+}
+
+public final class PeerStoryStatsView: PostboxView {
+    public let storyStats: [PeerId: PeerStoryStats]
+    
+    init(_ view: MutablePeerStoryStatsView) {
+        self.storyStats = view.storyStats
+    }
+}