c# - SignalR 客户端接收来自仪表板客户端而不是电子商务客户端的调用
问题描述
我有 2 个 Vue.js 客户端共享同一个后端服务器(ASP.NET Core)。其中一个客户端是电子商务网站,另一个客户端是管理订单的管理仪表板。
我已经实现了 SignalR 以允许在订单仪表板表上进行实时订单更新。当我在管理仪表板上更新订单状态时,更新当前实时工作,无需刷新浏览器,例如,当在浏览器 1 上从“待交付”更新为“已交付”时,浏览器 2 立即显示更改而无需刷新页面。
但是,当我从电子商务网站创建新订单时,即使我已检查我的代码是否进入 Hub 方法以向所有客户广播事件和新订单详细信息,订单仪表板也不会更新/刷新,并且当我检查开发工具时,它也没有收到任何事件。我将不胜感激有关此问题的一些帮助。
mount() 中的集线器方法
// Establish hub connection
this.connection = await OrderHub.connectToOrderHub();
// Establish hub methods
this.connection.on("OneOrder", order => {
console.log("OneOrder called");
console.log(order);
this.getAllOrders();
});
this.connection.on("MultipleOrders", orders => {
console.log("MultipleOrders called");
console.log(orders);
this.getAllOrders();
});
// start the connection
this.connection
.start()
.then(() => {
console.log("Connection to hub started");
})
.catch(err => console.log(err));
orderHub.js
const signalR = require("@aspnet/signalr");
class OrderHub {
async connectToOrderHub() {
return new signalR.HubConnectionBuilder()
.withUrl("https://localhost:44393/order-hub")
.configureLogging(signalR.LogLevel.Error)
.build();
}
}
export default new OrderHub();
服务器端的 OrderHub.cs
public interface IOrderHub
{
Task NotifyOneChange(Order newOrder);
Task NotifyMultipleChanges(List<Order> newOrders);
}
public class OrderHub : Hub, IOrderHub
{
private readonly IHubContext<OrderHub> _hubContext;
public OrderHub(IHubContext<OrderHub> hubContext)
{
_hubContext = hubContext;
}
public async Task NotifyOneChange(Order newOrder)
{
await _hubContext.Clients.All.SendAsync("OneOrder", newOrder);
}
public async Task NotifyMultipleChanges(List<Order> newOrders)
{
await _hubContext.Clients.All.SendAsync("MultipleOrders", newOrders);
}
}
创建订单方法
public async Task<Order> Create(Order order)
{
Order newOrder;
try
{
List<string> imgKeys = new List<string>();
foreach (OrderItem item in order.OrderItems)
{
imgKeys.Add(item.OrderImageKey);
}
// make images on s3 permanent
List<string> imgUrls = await _s3Service.CopyImagesAsync(imgKeys);
// put the new images url into object
for (int i = 0; i < order.OrderItems.Count; i++)
{
order.OrderItems.ElementAt(i).OrderImageUrl = imgUrls.ElementAt(i);
}
// create new order object to be added
newOrder = new Order()
{
CreatedAt = DateTime.Now,
UpdatedAt = DateTime.Now,
OrderSubtotal = decimal.Parse(order.OrderSubtotal.ToString()),
OrderTotal = decimal.Parse(order.OrderTotal.ToString()),
ReferenceNo = order.ReferenceNo,
Request = order.Request,
Email = EncryptString(order.EmailString, encryptionKey),
UpdatedById = order.UpdatedById,
DeliveryTypeId = order.DeliveryTypeId,
Address = order.Address,
StatusId = 1,
OrderItems = order.OrderItems
};
// add to database
await _context.Orders.AddAsync(newOrder);
await _context.SaveChangesAsync();
}
catch (Exception ex)
{
throw new AppException("Unable to create product record.", new { message = ex.Message });
}
await _orderHub.NotifyOneChange(newOrder); // it steps inside & executes the method, but client side does not receive any events
// returns product once done
return newOrder;
}
解决方案
我设法找出了这个问题的原因。当消息超过一定大小时,SignalR 似乎会中断,这里引用了这个问题。为了解决这个问题,我决定传入订单的 ID 而不是整个订单对象,并执行另一个 GET 调用以在单独的 API 调用中检索详细信息,以保持 SignalR 消息较小。