我似乎无法覆盖net.Socket.write。下面的示例不是我的真实用例,而是一个缩小的,可运行的示例来演示此问题。
const net = require("net");
class UTF8Socket extends net.Socket {
constructor () {
super();
this.setEncoding("utf8");
}
write(data, cb) {
console.log("Sending...");
super.write(data, "utf8", cb);
}
end(data) {
console.log("Ending socket...");
super.end(data);
}
}
// Setup server
const server = net.createServer(socket => {
socket.setEncoding("utf8");
socket.on("data", (res) => console.log("Server received data:", res));
});
server.listen(8080, '127.0.0.1');
// Create a UTF8Socket and write to server
const socket = new UTF8Socket();
socket.connect(8080, "127.0.0.1", () => {
socket.write("test write\n");
socket.end("test end");
});
预期输出:
发送...
结束插座...
服务器收到数据:test write
测试结束
实际输出:
结束插座...
服务器收到数据:test write
测试结束
从输出中可以看到被覆盖的结束函数,但只调用了原始的net.Socket.write。我觉得我错过了一些东西......
答案 0 :(得分:1)
我想这是因为net.Socket.connect()
的实施中of this code:
if (this.write !== Socket.prototype.write)
this.write = Socket.prototype.write;
可能的解决方法:
connect() {
let result = super.connect.apply(this, arguments);
this.write = UTF8Socket.prototype.write.bind(this);
return result;
}