codies/main.go

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