Refactoring

submodules/TelegramCore/Sources/TelegramEngine/Peers/FindChannelById.swift

@@ -0,0 +1,37 @@
+import Foundation
+import SwiftSignalKit
+import Postbox
+import TelegramApi
+
+func _internal_findChannelById(postbox: Postbox, network: Network, channelId: Int32) -> Signal<Peer?, NoError> {
+    return network.request(Api.functions.channels.getChannels(id: [.inputChannel(channelId: channelId, accessHash: 0)]))
+    |> map(Optional.init)
+    |> `catch` { _ -> Signal<Api.messages.Chats?, NoError> in
+        return .single(nil)
+    }
+    |> mapToSignal { result -> Signal<Peer?, NoError> in
+        guard let result = result else {
+            return .single(nil)
+        }
+        let chats: [Api.Chat]
+        switch result {
+            case let .chats(apiChats):
+                chats = apiChats
+            case let .chatsSlice(_, apiChats):
+                chats = apiChats
+        }
+        guard let chat = chats.first else {
+            return .single(nil)
+        }
+        guard let peer = parseTelegramGroupOrChannel(chat: chat) else {
+            return .single(nil)
+        }
+        
+        return postbox.transaction { transaction -> Peer? in
+            updatePeers(transaction: transaction, peers: [peer], update: { _, updated in
+                return updated
+            })
+            return peer
+        }
+    }
+}