pinguin-server/main.go

// API doc: https://wiki.summercamp.local/display/PIN/Pinguin+server+API
package main

import (
	"battlecamp-go-server/games"
	"encoding/json"
	"log"
	"net/http"
	"runtime"
	"strconv"

	"github.com/julienschmidt/httprouter"
)

var currentGames games.Games = games.New()

func main() {
	runtime.GOMAXPROCS(runtime.NumCPU())

	router := httprouter.New()
	router.GET("/", showIndex)
	router.GET("/games", listGames)
	router.PUT("/games", createGame)
	router.PUT("/games/:rows/:cols", createGame)
	router.GET("/games/:gameid", showGame)
	router.GET("/games/:gameid/:boardid", proxyHandler)
	//router.GET("/games/:gameid/players", playerListHandler)
	// TODO: /games/{id}/players/{playerId}
	router.POST("/games/:gameid/move/:playerId/:direction", movePlayer)
	
	router.PanicHandler = func(w http.ResponseWriter, r *http.Request, something interface{}) {
		http.Error(w, "Internal server error", http.StatusInternalServerError)
	}

	log.Fatal(http.ListenAndServe(":8080", router))
}

func showIndex(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	w.Write([]byte("Go battlecamp!"))
}

func proxyHandler(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {

	if ps.ByName("gameid") == "asciiboard" {
		showAsciiBoard(w, r, ps)
	} else if ps.ByName("gameid") == "board" {
		showBoard(w, r, ps)
	} else if ps.ByName("boardid") == "join" {
		joinGame(w, r, ps)
	} else {
		listPlayers(w, r, ps)
	}
}

func listGames(w http.ResponseWriter, r *http.Request, _ httprouter.Params) {
	w.Header().Set("Content-Type", "application/json")
	e := json.NewEncoder(w)
	e.Encode(currentGames.ListGames())
}

func createGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	xString := ps.ByName("x")
	yString := ps.ByName("y")
	var game *games.Game

	if xString != "" && yString != "" {
		x, _ := strconv.Atoi(xString)
		y, _ := strconv.Atoi(yString)
		game = games.NewGame(x, y)
	} else {
		game = games.NewGame(56, 35)
	}

	currentGames.AddGame(game)
	w.WriteHeader(http.StatusCreated)
}

func joinGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "joinGame not implemented", http.StatusNotImplemented)
}

func showGame(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	w.Header().Set("Content-Type", "application/json")
	id, _ := strconv.ParseInt(ps.ByName("gameid"), 10, 64)
	e := json.NewEncoder(w)
	e.Encode(currentGames.GetGame(id))
}

func listPlayers(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "listPlayers not implemented", http.StatusNotImplemented)
}

func movePlayer(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
	http.Error(w, "movePlayer not implemented", http.StatusNotImplemented)
}

// Request params: x={x}&y={y}&rows={rows}&cols={cols}
func showBoard(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
	w.Header().Set("Content-Type", "application/json")
	xString := req.FormValue("x")
	yString := req.FormValue("y")
	colsString := req.FormValue("cols")
	rowsString := req.FormValue("rows")

	id, _ := strconv.ParseInt(ps.ByName("boardid"), 10, 64)
	b := currentGames.GetGame(id).Board

	if xString != "" && yString != "" && colsString != "" && rowsString != "" {
		x, _ := strconv.Atoi(xString)
		y, _ := strconv.Atoi(yString)
		cols, _ := strconv.Atoi(colsString)
		rows, _ := strconv.Atoi(rowsString)
		b.WriteJSON(w, x, y, cols, rows)
	} else if xString != "" || yString != "" || colsString != "" || rowsString != "" {
		http.Error(w, "Bad request", http.StatusBadRequest)
	} else {
		b.WriteJSON(w, 0, 0, b.Cols, b.Rows)
	}
}

func showAsciiBoard(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
	w.Header().Set("Content-Type", "text/plain;charset=utf-8")

	id, _ := strconv.ParseInt(ps.ByName("boardid"), 10, 64)
	b := currentGames.GetGame(id).Board.String()
	w.Write([]byte(b))
}