packet

This is where we keep all of the packets that can be sent in Playground! Our packets generally fall into two classes (and they can belong to both):

• client: A packet sent by clients to the server
  • e.g. get_messages will be sent by a client who needs to load their private messages with someone else
• server: A packet sent by the server to clients
  • e.g. messages will be returned to a client after they send a get_messages packet

One example of a packet that belongs to both classes is chat, which a client can send to the server in order to send a chat message to the room. The server will in turn send this same packet back to the other clients.

Adding a new client packet

1. Create a struct for this packet (see existing files for examples). Make sure to implement PermissionCheck, MarshalBinary, and UnmarshalBinary.
   • PermissionCheck returns true when the sender has permission to send that packet
2. Add the new packet to parse.go along with its identifier
3. Write the handler for this packet in hub.go

Adding a new server packet

1. Create a struct for this packet. Make sure to implement MarshalBinary and UnmarshalBinary
2. Create an Init function with parameters that mirror what needs to be sent to the client
3. Use the Init function to create a new packet, and pass it to h.Send to send it to clients