Catch concurrent map read writes in gin

gin-gonic/gin#700

core/ginServer/ginServerHelpers.go

@@ -28,7 +28,14 @@ type LocaleLanguage struct {
 	Language string
 }
 
-func GetSessionKey(c *gin.Context, key string) string {
+func GetSessionKey(c *gin.Context, key string) (sessionKey string) {
+	//https://github.com/gin-gonic/gin/issues/700
+	// defer needed to catch session.Get concurrent map read write.
+	defer func() {
+	    if r := recover(); r != nil {
+	        return
+	    }
+	}()
 	session := sessions.Default(c)
 	if strings.Contains(c.Request.Host, ".com") {
 		session.Options(sessions.Options{MaxAge: 86400 * serverSettings.WebConfig.Application.SessionExpirationDays,
@@ -37,9 +44,11 @@ func GetSessionKey(c *gin.Context, key string) string {
 	}
 	value := session.Get(key)
 	if value == nil {
-		return ""
+		sessionKey = ""
+		return
 	} else {
-		return session.Get(key).(string)
+		sessionKey = session.Get(key).(string)
+		return
 	}
 }