# Functions
BroadcastMessage send broadcast message to channel and record stats.
HandleWebSocketCommand used to register command and handler.
InitWebSocket start websocket.
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ServeWs handles websocket requests from the peer.
# Constants
ConfigMessage used to send configuration.
PrivateMessage means message is 1 to 1.
PublicMessage means broadcast message.
# Structs
Hub maintains the set of active connections and broadcasts messages to the connections.
WebsocketConnection is an middleman between the websocket connection and the hub.
# Type aliases
MsgType is the type of different message.
WebsocketHandlerFunc define the func to handle websocket.