add /stats endpoint.

README.md

@@ -33,6 +33,7 @@ For n.eko room management software visit https://github.com/m1k1o/neko-rooms.
 - Added `VIDEO_BITRATE` and `AUDIO_BITRATE` in kbit/s to control stream quality (in collaboration with @mbattista).
 - Added `MAX_FPS`, where you can specify max WebRTC frame rate. When set to `0`, frame rate won't be capped and you can enjoy your real `60fps` experience. Originally, it was constant at `25fps`.
 - Invite links. You can invite people and they don't need to enter passwords by themselves (and get confused about user accounts that do not exits). You can put your password in URL using `?pwd=<your-password>` and it will be automatically used when logging in.
+- Added `/stats?pwd=<admin>` endpoint to get total active connections.
 
 ### Bugs
 - Fixed minor gst pipeline bug.

server/internal/http/http.go

@@ -2,6 +2,7 @@ package http
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net/http"
 	"os"
@@ -23,7 +24,7 @@ type Server struct {
 }
 
 func New(conf *config.Server, webSocketHandler types.WebSocketHandler) *Server {
-	logger := log.With().Str("module", "webrtc").Logger()
+	logger := log.With().Str("module", "http").Logger()
 
 	router := chi.NewRouter()
 	// router.Use(middleware.Recoverer) // Recover from panics without crashing server
@@ -34,6 +35,31 @@ func New(conf *config.Server, webSocketHandler types.WebSocketHandler) *Server {
 		webSocketHandler.Upgrade(w, r)
 	})
 
+	router.Get("/stats", func(w http.ResponseWriter, r *http.Request) {
+		password := r.URL.Query().Get("pwd")
+		isAdmin, err := webSocketHandler.IsAdmin(password)
+		if err != nil {
+			w.WriteHeader(http.StatusForbidden)
+			fmt.Fprint(w, err)
+			return
+		}
+
+		if !isAdmin {
+			w.WriteHeader(http.StatusUnauthorized)
+			fmt.Fprint(w, "bad authorization")
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		if err := json.NewEncoder(w).Encode(struct{
+			Connections uint32 `json:"connections"`
+		}{
+			Connections: webSocketHandler.TotalConns(),
+		}); err != nil {
+			logger.Warn().Err(err).Msg("failed writing json error response")
+		}
+	})
+
 	router.Get("/health", func(w http.ResponseWriter, r *http.Request) {
 		w.Write([]byte("true"))
 	})

server/internal/types/webscoket.go

@@ -12,4 +12,6 @@ type WebSocketHandler interface {
 	Start() error
 	Shutdown() error
 	Upgrade(w http.ResponseWriter, r *http.Request) error
+	TotalConns() uint32
+	IsAdmin(password string) (bool, error)
 }

server/internal/websocket/websocket.go

@@ -3,6 +3,7 @@ package websocket
 import (
 	"fmt"
 	"net/http"
+	"sync/atomic"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -38,6 +39,7 @@ func New(sessions types.SessionManager, remote types.RemoteManager, broadcast ty
 			banned:    make(map[string]bool),
 			locked:    false,
 		},
+		conns: 0,
 	}
 }
 
@@ -51,6 +53,7 @@ type WebSocketHandler struct {
 	remote    types.RemoteManager
 	conf      *config.WebSocket
 	handler   *MessageHandler
+	conns     uint32
 	shutdown  chan bool
 }
 
@@ -179,18 +182,38 @@ func (ws *WebSocketHandler) Upgrade(w http.ResponseWriter, r *http.Request) erro
 		Str("address", connection.RemoteAddr().String()).
 		Msg("new connection created")
 
+	atomic.AddUint32(&ws.conns, uint32(1))
+
 	defer func() {
 		ws.logger.
 			Debug().
 			Str("session", id).
 			Str("address", connection.RemoteAddr().String()).
 			Msg("session ended")
+
+		atomic.AddUint32(&ws.conns, ^uint32(0))
 	}()
 
 	ws.handle(connection, id)
 	return nil
 }
 
+func (ws *WebSocketHandler) TotalConns() uint32 {
+	return atomic.LoadUint32(&ws.conns)
+}
+
+func (ws *WebSocketHandler) IsAdmin(password string) (bool, error) {
+	if password == ws.conf.AdminPassword {
+		return true, nil
+	}
+
+	if password == ws.conf.Password {
+		return false, nil
+	}
+
+	return false, fmt.Errorf("invalid password")
+}
+
 func (ws *WebSocketHandler) authenticate(r *http.Request) (string, string, bool, error) {
 	ip := r.RemoteAddr
 
@@ -208,15 +231,8 @@ func (ws *WebSocketHandler) authenticate(r *http.Request) (string, string, bool,
 		return "", ip, false, fmt.Errorf("no password provided")
 	}
 
-	if passwords[0] == ws.conf.AdminPassword {
+	isAdmin, err := ws.IsAdmin(passwords[0])
-		return id, ip, true, nil
+	return id, ip, isAdmin, err
-	}
-
-	if passwords[0] == ws.conf.Password {
-		return id, ip, false, nil
-	}
-
-	return "", ip, false, fmt.Errorf("invalid password: %s", passwords[0])
 }
 
 func (ws *WebSocketHandler) handle(connection *websocket.Conn, id string) {