fix: use mutex to serialise websocket writes

fix: convert js nulls to Go zero values

binding_function.go

@@ -153,8 +153,11 @@ func (b *boundFunction) setInputValue(index int, typ reflect.Type, val interface
 		}
 	}()
 
-	// Do the conversion
-	result = reflect.ValueOf(val).Convert(typ)
-
+	// Translate javascript null values
+	if val == nil {
+		result = reflect.Zero(typ)
+	} else {
+		result = reflect.ValueOf(val).Convert(typ)
+	}
 	return result, err
 }

renderer_headless.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
+	"sync"
 
 	"github.com/dchest/htmlmin"
 	"github.com/gorilla/websocket"
@@ -45,6 +46,9 @@ type Headless struct {
 	initialisationJS []string
 	server           *http.Server
 	theConnection    *websocket.Conn
+
+	// Mutex for writing to the socket
+	lock sync.Mutex
 }
 
 // Initialise the Headless Renderer
@@ -103,6 +107,10 @@ func (h *Headless) wsBridgeHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (h *Headless) sendMessage(conn *websocket.Conn, msg string) {
+
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
 	if err := conn.WriteMessage(websocket.TextMessage, []byte(msg)); err != nil {
 		h.log.Error(err.Error())
 	}