fix: harden websocket heartbeat under load

server/main.go

@@ -322,6 +322,10 @@ type configType struct {
 	// If true, do not attempt to negotiate websocket per message compression (RFC 7692.4).
 	// It should be disabled (set to true) if you are using MSFT IIS as a reverse proxy.
 	WSCompressionDisabled bool `json:"ws_compression_disabled"`
+	// WebSocket heartbeat period and the maximum time to wait for a Pong, in seconds.
+	// Zero values use the built-in defaults.
+	WSPingPeriodSeconds int `json:"ws_ping_period_seconds"`
+	WSPongWaitSeconds   int `json:"ws_pong_wait_seconds"`
 	// Address:port to listen for gRPC clients. If blank gRPC support will not be initialized.
 	// Could be overridden from the command line with --grpc_listen.
 	GrpcListen string `json:"grpc_listen"`
@@ -716,6 +720,10 @@ func main() {
 
 	// Websocket compression.
 	globals.wsCompression = !config.WSCompressionDisabled
+	if err = configureWSHeartbeat(config.WSPingPeriodSeconds, config.WSPongWaitSeconds); err != nil {
+		logs.Err.Fatal("Invalid WebSocket heartbeat configuration: ", err)
+	}
+	logs.Info.Printf("WebSocket heartbeat ping=%s pong_wait=%s", pingPeriod, pongWait)
 
 	if config.Media != nil {
 		if config.Media.UseHandler == "" {