304 lines
7.3 KiB
Go
304 lines
7.3 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"os"
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"time"
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"github.com/go-chi/chi"
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"github.com/go-chi/chi/middleware"
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"github.com/jessevdk/go-flags"
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"github.com/posener/ctxutil"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/tomwright/queryparam/v4"
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"github.com/zikaeroh/codies/internal/protocol"
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"github.com/zikaeroh/codies/internal/responder"
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"github.com/zikaeroh/codies/internal/server"
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"github.com/zikaeroh/codies/internal/version"
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"golang.org/x/sync/errgroup"
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"nhooyr.io/websocket"
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)
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var args = struct {
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Addr string `long:"addr" env:"CODIES_ADDR" description:"Address to listen at"`
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Origins []string `long:"origins" env:"CODIES_ORIGINS" env-delim:"," description:"Additional valid origins for WebSocket connections"`
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Prod bool `long:"prod" env:"CODIES_PROD" description:"Enables production mode"`
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Debug bool `long:"debug" env:"CODIES_DEBUG" description:"Enables debug mode"`
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}{
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Addr: ":5000",
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}
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var wsOpts *websocket.AcceptOptions
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func main() {
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rand.Seed(time.Now().Unix())
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log.SetFlags(log.LstdFlags | log.Lshortfile)
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if _, err := flags.Parse(&args); err != nil {
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// Default flag parser prints messages, so just exit.
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os.Exit(1)
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}
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if !args.Prod && !args.Debug {
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log.Fatal("missing required option --prod or --debug")
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} else if args.Prod && args.Debug {
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log.Fatal("must specify either --prod or --debug")
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}
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log.Printf("starting codies server, version %s", version.Version())
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wsOpts = &websocket.AcceptOptions{
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OriginPatterns: args.Origins,
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CompressionMode: websocket.CompressionContextTakeover,
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}
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if args.Debug {
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log.Println("starting in debug mode, allowing any WebSocket origin host")
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wsOpts.InsecureSkipVerify = true
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} else {
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if !version.VersionSet() {
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log.Fatal("running production build without version set")
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}
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}
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g, ctx := errgroup.WithContext(ctxutil.Interrupt())
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srv := server.NewServer()
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r := chi.NewMux()
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r.Use(func(next http.Handler) http.Handler {
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return promhttp.InstrumentHandlerCounter(metricRequest, next)
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})
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r.Use(middleware.Heartbeat("/ping"))
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r.Use(middleware.Recoverer)
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r.NotFound(staticHandler().ServeHTTP)
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r.Group(func(r chi.Router) {
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r.Use(middleware.NoCache)
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r.Get("/api/time", func(w http.ResponseWriter, r *http.Request) {
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responder.Respond(w, responder.Body(&protocol.TimeResponse{Time: time.Now()}))
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})
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r.Get("/api/stats", func(w http.ResponseWriter, r *http.Request) {
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rooms, clients := srv.Stats()
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responder.Respond(w,
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responder.Body(&protocol.StatsResponse{
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Rooms: rooms,
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Clients: clients,
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}),
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responder.Pretty(true),
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)
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})
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r.Group(func(r chi.Router) {
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if !args.Debug {
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r.Use(checkVersion)
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}
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r.Get("/api/exists", func(w http.ResponseWriter, r *http.Request) {
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query := &protocol.ExistsQuery{}
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if err := queryparam.Parse(r.URL.Query(), query); err != nil {
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responder.Respond(w, responder.Status(http.StatusBadRequest))
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return
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}
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room := srv.FindRoomByID(query.RoomID)
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if room == nil {
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responder.Respond(w, responder.Status(http.StatusNotFound))
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} else {
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responder.Respond(w, responder.Status(http.StatusOK))
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}
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})
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r.Post("/api/room", func(w http.ResponseWriter, r *http.Request) {
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defer r.Body.Close()
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req := &protocol.RoomRequest{}
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if err := json.NewDecoder(r.Body).Decode(req); err != nil {
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responder.Respond(w, responder.Status(http.StatusBadRequest))
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return
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}
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if msg, valid := req.Valid(); !valid {
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responder.Respond(w,
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responder.Status(http.StatusBadRequest),
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responder.Body(&protocol.RoomResponse{
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Error: stringPtr(msg),
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}),
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)
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return
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}
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var room *server.Room
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if req.Create {
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var err error
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room, err = srv.CreateRoom(req.RoomName, req.RoomPass)
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if err != nil {
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switch err {
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case server.ErrRoomExists:
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responder.Respond(w,
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responder.Status(http.StatusBadRequest),
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responder.Body(&protocol.RoomResponse{
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Error: stringPtr("Room already exists."),
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}),
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)
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case server.ErrTooManyRooms:
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responder.Respond(w,
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responder.Status(http.StatusServiceUnavailable),
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responder.Body(&protocol.RoomResponse{
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Error: stringPtr("Too many rooms."),
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}),
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)
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default:
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responder.Respond(w,
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responder.Status(http.StatusInternalServerError),
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responder.Body(&protocol.RoomResponse{
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Error: stringPtr("An unknown error occurred."),
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}),
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)
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}
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return
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}
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} else {
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room = srv.FindRoom(req.RoomName)
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if room == nil || room.Password != req.RoomPass {
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responder.Respond(w,
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responder.Status(http.StatusNotFound),
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responder.Body(&protocol.RoomResponse{
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Error: stringPtr("Room not found or password does not match."),
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}),
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)
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return
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}
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}
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responder.Respond(w, responder.Body(&protocol.RoomResponse{
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ID: &room.ID,
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}))
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})
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r.Get("/api/ws", func(w http.ResponseWriter, r *http.Request) {
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query := &protocol.WSQuery{}
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if err := queryparam.Parse(r.URL.Query(), query); err != nil {
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responder.Respond(w, responder.Status(http.StatusBadRequest))
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return
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}
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if _, valid := query.Valid(); !valid {
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responder.Respond(w, responder.Status(http.StatusBadRequest))
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return
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}
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room := srv.FindRoomByID(query.RoomID)
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if room == nil {
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responder.Respond(w, responder.Status(http.StatusBadRequest))
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return
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}
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c, err := websocket.Accept(w, r, wsOpts)
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if err != nil {
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return
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}
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g.Go(func() error {
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room.HandleConn(query.PlayerID, query.Nickname, c)
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return nil
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})
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})
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})
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})
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g.Go(func() error {
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return srv.Run(ctx)
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})
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runServer(ctx, g, args.Addr, r)
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if args.Prod {
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runServer(ctx, g, ":2112", prometheusHandler())
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}
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log.Fatal(g.Wait())
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}
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func staticHandler() http.Handler {
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fs := http.Dir("./frontend/build")
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fsh := http.FileServer(fs)
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r := chi.NewMux()
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r.Use(middleware.Compress(5))
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r.Handle("/static/*", fsh)
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r.Handle("/favicon/*", fsh)
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r.Group(func(r chi.Router) {
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r.Use(middleware.NoCache)
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r.Handle("/*", fsh)
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})
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return r
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}
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func checkVersion(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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want := version.Version()
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toCheck := []string{
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r.Header.Get("X-CODIES-VERSION"),
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r.URL.Query().Get("codiesVersion"),
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}
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for _, got := range toCheck {
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if got == want {
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next.ServeHTTP(w, r)
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return
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}
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}
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reason := fmt.Sprintf("client version too old, please reload to get %s", want)
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if r.Header.Get("Upgrade") == "websocket" {
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c, err := websocket.Accept(w, r, wsOpts)
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if err != nil {
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return
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}
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c.Close(4418, reason)
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return
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}
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w.WriteHeader(http.StatusTeapot)
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fmt.Fprint(w, reason)
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})
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}
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func runServer(ctx context.Context, g *errgroup.Group, addr string, handler http.Handler) {
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httpSrv := http.Server{Addr: addr, Handler: handler}
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g.Go(func() error {
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<-ctx.Done()
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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return httpSrv.Shutdown(ctx)
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})
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g.Go(func() error {
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return httpSrv.ListenAndServe()
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})
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}
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func prometheusHandler() http.Handler {
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.Handler())
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return mux
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}
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