refactor and cleanup [skip ci]

submodules/Postbox/Sources/MutableBasicPeerView.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+final class MutableBasicPeerView: MutablePostboxView {
+    private let peerId: PeerId
+    fileprivate var peer: Peer?
+    
+    init(postbox: Postbox, peerId: PeerId) {
+        self.peerId = peerId
+        self.peer = postbox.peerTable.get(peerId)
+    }
+    
+    func replay(postbox: Postbox, transaction: PostboxTransaction) -> Bool {
+        var updated = false
+        if let peer = transaction.currentUpdatedPeers[self.peerId] {
+            self.peer = peer
+            updated = true
+        }
+        
+        return updated
+    }
+    
+    func immutableView() -> PostboxView {
+        return BasicPeerView(self)
+    }
+}
+
+public final class BasicPeerView: PostboxView {
+    public let peer: Peer?
+    
+    init(_ view: MutableBasicPeerView) {
+        self.peer = view.peer
+    }
+}