Multiplayer Snake

I'm porting the server from my previous snake-python project from Python 3 to Go, and the frontend to Javascript using HTML5 bindings.

Setup

Run the command 'go get github.com/gorilla/websocket' to grab the only dependency. Run 'go install' inside of the source directory to install 'snake-mmo' into '$GOPATH/bin'. Then, start the server with 'snake-mmo' (or '$GOPATH/bin/snake-mmo'), and open snake.html in a web browser.

Hacker School Task: Highscores and Current Scores List

We need to modify the server to compute and pass the high/current scores, and we need to modify the frontend to parse the high/current scores and attach them to the DOM. Changes that need to be made:

Message Passing and Parsing

• The message format needs to be changed from "(\(\d+ \d+ \w+\))*" (the escaped parentheses, like "(", mean literal parentheses in the string) to the following in BNF:

          message ::== "(" <message-part> ")"
     message-part ::== <location-message> 
                     | <score-message>
                     | <direction-message>
 location-message ::== "loc  " <number> " " <number> " " <color>
    score-message ::== "score " <string> " " <number>
direction-message ::== "dir " <direction>
        direction ::== "left" | "right" | "up" | "down"
            color ::== a string defined as a constant in color.go

Server side

• func createSendData's internals should be refactored into two functions, createLocationData and createScoreData, which are then concatenated together and returned by createSendData.

• func decodeMessage needs to be created, which parses the message passed througrh the websocket connection and calls either func decodeDir or func decodeName. It should be called in the "case c := <-h.update" block in func (h *hub) run.

• func decodeName needs to be created, to parse and return a name.

Client side

• Update drawScreen to parse incoming messages. Think about refactoring the parsing part into multiple functions.