Question

当我的websocket有超过2个连接时，我正在尝试抛出错误服务器端。我有这个很好的客户端onerror方法，但我无法访问我的代码部分。我正在使用nodeJS和包含错误处理文档最小的文件包ws。

server.js

theWebSocketServer.on('connection', function connection(websocket){
    if (theWebSocketServer.clients.length >2) {
        // I want to throw the error here and pass it to onerror
        console.log('No access allowed', theWebSocketServer.clients.length)
    } else {
        console.log('happy connection', theWebSocketServer.clients.length)
    }
})

client.js

wsConnection.onerror = function(eventInfo) {
   alert("There was a connection error!");
   console.log("Socket error!", eventInfo);
}

如何在客户端JS上发送错误？

Answer 1

在文档中，我找不到任何方法将错误发送到客户端。由于ws是websockets的一个小模块，我认为它可以用来在服务器和客户端之间发送消息，如果你需要花哨的东西，你需要实现自己的协议（你解释的方式那些消息。）

例如，在这种情况下，它可能是这样的：

<强>客户端

wsConnection.onmessage = (m) => {
    // You can define errors by checking if the event data contains 
    // something specific: such as the message starts with "Error"
    // or if the property of the object is "error" and so on.
    if (m.data.startsWith("Error")) {
      alert(m.data)
      // This will show in the popup:
      // "Error: No access allowed"
    } else {
      // do something else
    }
};

wsConnection.onmessage = function(eventInfo) {
  /* Handle socket errors – e.g. internet goes down, connection is broken etc. */
}

服务器：

theWebSocketServer.on('connection', function connection(websocket){ if (theWebSocketServer.clients.length >2) { websocket.send("Error: No access allowed", err => { // Ensure your data was actually sent successfully and then // Close the connection websocket.close() // Just in case your data was not sent because // of an error, you may be interested so see what happened if (err) { return console.error(err); } }) // I want to throw the error here and pass it to onerror console.log('No access allowed', theWebSocketServer.clients.length) } else { console.log('happy connection', theWebSocketServer.clients.length) } })

NodeJs / WS：如何抛出客户端处理的错误服务器端？

1 个答案: