evaluate different backend chat frameworks

[niksauer]

https://github.com/vapor-community/chat-example

[niksauer]

https://github.com/vapor-community/chat-example/blob/master/Sources/App/Room.swift https://github.com/vapor-community/chat-example/blob/master/Sources/App/Droplet%2BSetup.swift https://github.com/vapor-community/chat-ios-example/blob/master/vapor-chat-ios/Chat/Chat.swift

[niksauer]

websocket.onString { websocket, string in
            do {
                guard let data = string.data(using: .utf8) else {
                    // error converting string to data
                    return
                }

                let json = try JSONSerialization.jsonObject(with: data, options: []) as! [String: AnyObject]

                guard let senderID = json["senderID"] as? Int, let message = json["message"] as? String else {
                    // missing required fields or invalid data types
                    return
                }

                if userID == nil && !chatroom.connections.contains(where: { $0.key == senderID }) {
                    userID = senderID
                    chatroom.connections[senderID] = websocket
                    chatroom.notify(event: .userJoined(senderID))
                } else {
                    // user already has an active session
                }

                chatroom.send(senderID: senderID, message: message)
            } catch {
                // error serializing JSON string to dictionary
                print(error)
            }
        }

        websocket.onClose { websocket, _  in
            pingTimer?.cancel()
            pingTimer = nil

            guard let userID = userID else {
                return
            }

            print("closing websocket for \(userID)")
            chatroom.connections.removeValue(forKey: userID)
            chatroom.notify(event: .userLeft(userID))
        }

[niksauer]

https://socket.io/get-started/chat/

[niksauer]

@BigPen1s @xplip is our current chat infrastructure sufficient? please see liveChat(_:) in ConversationController.swift and backend ERM model