Websocket system

[cswimr]

The developers of Ketchupbot have requested a websocket system, where they can connect to said websocket and get sent websocket messages whenever a ship is updated, containing the updated ship stats as well. This issue will track progress on adding this functionality. I'll go into more details on implementation after I get a feel for the codebase.

[smallketchup82]

I'd like a progress check on this. If it's not being actively developed, then I may take it upon myself to do this. I've since stopped developing in typescript/javascript and am most comfortable with C#. So my implementation might be half baked.

Let me know what's up with this.

[Wingysam]

My suggestion for the implementation of this:

1. Listen for WebSocket connections on /api/v2/ships/ws.
   • The code for the /api/v2/ships API is here: https://github.com/Wingysam/Galaxy-Info-v2/blob/master/server/src/web/api/v2/ships/index.ts
2. When Celebrimbor POSTs ship data to Galaxy Info, iterate through every ship, and check if it was changed, and if so, send it to every connected socket.
   • The code for this is here: https://github.com/Wingysam/Galaxy-Info-v2/blob/master/shared/ships/src/ships.ts#L462
   • You can check if a SerializedShip was changed with _.isEqual.
   • You should put the code for WebSockets in its own file that exposes something to the GalaxyInfo object that ServerShips#save can call out to.
   • You may want to combine the keys for the old data and new data to make sure you catch ships that are added, modified, and deleted.